# SPDX-License-Identifier: Apache-2.0
"""Tests for omlx.settings module."""

import json
import os
import tempfile
from argparse import Namespace
from pathlib import Path
from unittest.mock import patch

import pytest

from omlx.settings import (
    BURST_DECODE_MODES,
    DEFAULT_BURST_DECODE_MODE,
    AuthSettings,
    CacheSettings,
    ClaudeCodeSettings,
    GlobalSettings,
    HuggingFaceSettings,
    IntegrationSettings,
    LoggingSettings,
    MCPSettings,
    MemorySettings,
    ModelSettings,
    NetworkSettings,
    SamplingSettings,
    SchedulerSettings,
    ServerSettings,
    burst_decode_env,
    get_settings,
    get_ssd_capacity,
    get_system_memory,
    init_settings,
    reset_settings,
    resolve_default_base_path,
)


class TestServerSettings:
    """Tests for ServerSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = ServerSettings()
        assert settings.host == "127.0.0.1"
        assert settings.port == 8000
        assert settings.log_level == "info"
        assert settings.cors_origins == ["*"]
        assert settings.sse_keepalive_mode == "chunk"
        assert settings.auto_start_on_launch is True
        assert settings.burst_decode_mode == "balanced"
        assert settings.preserve_mid_system_cache is True

    def test_custom_values(self):
        """Test custom values."""
        settings = ServerSettings(
            host="0.0.0.0",
            port=9000,
            log_level="debug",
            cors_origins=["https://example.com"],
        )
        assert settings.host == "0.0.0.0"
        assert settings.port == 9000
        assert settings.log_level == "debug"
        assert settings.cors_origins == ["https://example.com"]

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = ServerSettings(host="127.0.0.1", port=8000, log_level="info")
        result = settings.to_dict()
        assert result == {
            "host": "127.0.0.1",
            "port": 8000,
            "log_level": "info",
            "cors_origins": ["*"],
            "server_aliases": [],
            "sse_keepalive_mode": "chunk",
            "auto_start_on_launch": True,
            "burst_decode_mode": "balanced",
            "preserve_mid_system_cache": True,
        }

    def test_from_dict_sse_keepalive_mode(self):
        """sse_keepalive_mode round-trips through from_dict / to_dict."""
        for mode in ("chunk", "comment", "off"):
            settings = ServerSettings.from_dict({"sse_keepalive_mode": mode})
            assert settings.sse_keepalive_mode == mode
            assert settings.to_dict()["sse_keepalive_mode"] == mode

    def test_from_dict_burst_decode_mode(self):
        """burst_decode_mode round-trips through from_dict / to_dict."""
        for mode in BURST_DECODE_MODES:
            settings = ServerSettings.from_dict({"burst_decode_mode": mode})
            assert settings.burst_decode_mode == mode
            assert settings.to_dict()["burst_decode_mode"] == mode

    def test_from_dict_burst_decode_mode_default(self):
        """A settings.json without burst_decode_mode falls back to the default."""
        settings = ServerSettings.from_dict({})
        assert settings.burst_decode_mode == DEFAULT_BURST_DECODE_MODE

    def test_from_dict_preserve_mid_system_cache(self):
        """preserve_mid_system_cache round-trips through from_dict / to_dict."""
        settings = ServerSettings.from_dict({"preserve_mid_system_cache": False})
        assert settings.preserve_mid_system_cache is False
        assert settings.to_dict()["preserve_mid_system_cache"] is False

    def test_from_dict_preserve_mid_system_cache_default(self):
        """Missing preserve_mid_system_cache keeps the cache-friendly default."""
        settings = ServerSettings.from_dict({})
        assert settings.preserve_mid_system_cache is True

    def test_from_dict_auto_start_on_launch(self):
        """auto_start_on_launch round-trips through from_dict / to_dict."""
        settings = ServerSettings.from_dict({"auto_start_on_launch": False})
        assert settings.auto_start_on_launch is False
        assert settings.to_dict()["auto_start_on_launch"] is False

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"host": "0.0.0.0", "port": 9000, "log_level": "debug"}
        settings = ServerSettings.from_dict(data)
        assert settings.host == "0.0.0.0"
        assert settings.port == 9000
        assert settings.log_level == "debug"
        assert settings.cors_origins == ["*"]  # default

    def test_from_dict_reads_bind_address_fallback(self):
        """bind_address is accepted only as a compatibility fallback."""
        settings = ServerSettings.from_dict({"bind_address": "0.0.0.0"})
        assert settings.host == "0.0.0.0"

    def test_from_dict_host_wins_over_bind_address(self):
        """host remains the canonical persisted/admin API key."""
        settings = ServerSettings.from_dict(
            {"host": "127.0.0.1", "bind_address": "0.0.0.0"}
        )
        assert settings.host == "127.0.0.1"

    def test_from_dict_with_cors_origins(self):
        """Test creation from dictionary with cors_origins."""
        data = {
            "host": "0.0.0.0",
            "port": 9000,
            "cors_origins": ["https://chat.example.com", "http://localhost:3000"],
        }
        settings = ServerSettings.from_dict(data)
        assert settings.cors_origins == [
            "https://chat.example.com",
            "http://localhost:3000",
        ]

    def test_from_dict_with_defaults(self):
        """Test creation from partial dictionary uses defaults."""
        data = {"port": 9000}
        settings = ServerSettings.from_dict(data)
        assert settings.host == "127.0.0.1"  # default
        assert settings.port == 9000
        assert settings.log_level == "info"  # default
        assert settings.cors_origins == ["*"]  # default


class TestBurstDecodeEnv:
    """Tests for the Burst Decode mode -> OMLX_DECODE_BURST_* env mapping."""

    def test_off_disables_bursting(self):
        """'off' caps max_steps at 1, which disables bursting in _step_burst."""
        assert burst_decode_env("off")["OMLX_DECODE_BURST_MAX_STEPS"] == "1"

    def test_levels_set_single_request_budget(self):
        """light / balanced / aggressive map to the documented budgets."""
        assert burst_decode_env("light")["OMLX_DECODE_BURST_BUDGET_SINGLE_S"] == "0.05"
        assert (
            burst_decode_env("balanced")["OMLX_DECODE_BURST_BUDGET_SINGLE_S"] == "0.1"
        )
        assert (
            burst_decode_env("aggressive")["OMLX_DECODE_BURST_BUDGET_SINGLE_S"] == "0.2"
        )

    def test_on_levels_keep_burst_enabled(self):
        """The on-levels keep max_steps above the disable threshold."""
        for mode in ("light", "balanced", "aggressive"):
            assert int(burst_decode_env(mode)["OMLX_DECODE_BURST_MAX_STEPS"]) > 1

    def test_unknown_mode_falls_back_to_default(self):
        """An unknown mode never disables bursting; it uses the default."""
        assert burst_decode_env("bogus") == burst_decode_env(DEFAULT_BURST_DECODE_MODE)

    def test_keys_match_engine_config_env_vars(self):
        """The mapping only sets the env vars EngineConfig actually reads."""
        assert set(burst_decode_env("balanced")) == {
            "OMLX_DECODE_BURST_MAX_STEPS",
            "OMLX_DECODE_BURST_BUDGET_SINGLE_S",
        }


class TestModelSettings:
    """Tests for ModelSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = ModelSettings()
        assert settings.model_dirs == []
        assert settings.model_dir is None

    def test_get_model_dirs_default(self):
        """Test default model directories."""
        settings = ModelSettings()
        base_path = Path("/tmp/omlx")
        assert settings.get_model_dirs(base_path) == [Path("/tmp/omlx/models")]
        assert settings.get_model_dir(base_path) == Path("/tmp/omlx/models")

    def test_get_model_dirs_custom(self):
        """Test custom model directories."""
        settings = ModelSettings(model_dirs=["/custom/models"])
        base_path = Path("/tmp/omlx")
        assert settings.get_model_dirs(base_path) == [Path("/custom/models")]

    def test_get_model_dirs_multiple(self):
        """Test multiple model directories."""
        settings = ModelSettings(model_dirs=["/path/a", "/path/b"])
        base_path = Path("/tmp/omlx")
        result = settings.get_model_dirs(base_path)
        assert len(result) == 2
        assert result[0] == Path("/path/a")
        assert result[1] == Path("/path/b")
        # get_model_dir returns the first (primary) directory
        assert settings.get_model_dir(base_path) == Path("/path/a")

    def test_get_model_dirs_with_tilde(self):
        """Test model directory with tilde expansion."""
        settings = ModelSettings(model_dirs=["~/models"])
        base_path = Path("/tmp/omlx")
        result = settings.get_model_dirs(base_path)
        assert "~" not in str(result[0])  # Should be expanded

    def test_get_model_dirs_backward_compat(self):
        """Test backward compatibility: model_dir fallback when model_dirs is empty."""
        settings = ModelSettings(model_dir="/legacy/models")
        base_path = Path("/tmp/omlx")
        assert settings.get_model_dirs(base_path) == [Path("/legacy/models")]

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = ModelSettings(model_dirs=["/models"])
        result = settings.to_dict()
        assert result == {
            "model_dirs": ["/models"],
            "model_dir": "/models",
            "model_fallback": False,
            "hide_helper_models": False,
        }

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"model_dirs": ["/models"]}
        settings = ModelSettings.from_dict(data)
        assert settings.model_dirs == ["/models"]
        assert settings.model_fallback is False

    def test_from_dict_ignores_legacy_max_model_memory(self):
        """Legacy max_model_memory key in settings.json is silently ignored."""
        data = {"model_dirs": ["/models"], "max_model_memory": "32GB"}
        settings = ModelSettings.from_dict(data)
        assert settings.model_dirs == ["/models"]
        assert not hasattr(settings, "max_model_memory")

    def test_model_fallback_default(self):
        """Test model_fallback defaults to False."""
        settings = ModelSettings()
        assert settings.model_fallback is False

    def test_model_fallback_to_dict(self):
        """Test model_fallback is included in to_dict."""
        settings = ModelSettings(model_dirs=["/models"], model_fallback=True)
        result = settings.to_dict()
        assert result["model_fallback"] is True

    def test_model_fallback_from_dict(self):
        """Test model_fallback is loaded from dict."""
        data = {"model_dirs": ["/models"], "model_fallback": True}
        settings = ModelSettings.from_dict(data)
        assert settings.model_fallback is True

    def test_model_fallback_from_dict_missing(self):
        """Test model_fallback defaults to False when missing from dict."""
        data = {"model_dirs": ["/models"]}
        settings = ModelSettings.from_dict(data)
        assert settings.model_fallback is False

    def test_from_dict_backward_compat(self):
        """Test from_dict migrates old model_dir to model_dirs."""
        data = {"model_dir": "/legacy/models"}
        settings = ModelSettings.from_dict(data)
        assert settings.model_dirs == ["/legacy/models"]
        assert settings.model_dir == "/legacy/models"


class TestSchedulerSettings:
    """Tests for SchedulerSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = SchedulerSettings()
        assert settings.max_concurrent_requests == 8
        assert settings.embedding_batch_size == 32

    def test_custom_values(self):
        """Test custom values."""
        settings = SchedulerSettings(
            max_concurrent_requests=128, embedding_batch_size=16
        )
        assert settings.max_concurrent_requests == 128
        assert settings.embedding_batch_size == 16

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = SchedulerSettings()
        result = settings.to_dict()
        assert result == {
            "max_concurrent_requests": 8,
            "embedding_batch_size": 32,
            "chunked_prefill": False,
        }

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"max_concurrent_requests": 512}
        settings = SchedulerSettings.from_dict(data)
        assert settings.max_concurrent_requests == 512
        assert settings.embedding_batch_size == 32

        data = {"max_concurrent_requests": 512, "embedding_batch_size": 24}
        settings = SchedulerSettings.from_dict(data)
        assert settings.max_concurrent_requests == 512
        assert settings.embedding_batch_size == 24

    def test_from_dict_backwards_compat(self):
        """Test creation from dictionary with old keys."""
        data = {"max_num_seqs": 64}
        settings = SchedulerSettings.from_dict(data)
        assert settings.max_concurrent_requests == 64

        data = {"completion_batch_size": 32}
        settings = SchedulerSettings.from_dict(data)
        assert settings.max_concurrent_requests == 32


class TestCacheSettings:
    """Tests for CacheSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = CacheSettings()
        assert settings.enabled is True
        assert settings.ssd_cache_dir is None
        assert settings.ssd_cache_max_size == "auto"
        assert settings.initial_cache_blocks == 256

    def test_get_ssd_cache_dir_default(self):
        """Test default SSD cache directory."""
        settings = CacheSettings(ssd_cache_dir=None)
        base_path = Path("/tmp/omlx")
        assert settings.get_ssd_cache_dir(base_path) == Path("/tmp/omlx/cache")

    def test_get_ssd_cache_dir_custom(self):
        """Test custom SSD cache directory."""
        settings = CacheSettings(ssd_cache_dir="/custom/cache")
        base_path = Path("/tmp/omlx")
        assert settings.get_ssd_cache_dir(base_path) == Path("/custom/cache")

    def test_get_ssd_cache_max_size_bytes_auto(self):
        """Test auto SSD cache size calculation."""
        settings = CacheSettings(ssd_cache_max_size="auto")
        base_path = Path("/tmp/omlx")
        cache_dir = settings.get_ssd_cache_dir(base_path)
        expected = int(get_ssd_capacity(cache_dir) * 0.1)
        assert settings.get_ssd_cache_max_size_bytes(base_path) == expected

    def test_get_ssd_cache_max_size_bytes_explicit(self):
        """Test explicit SSD cache size."""
        settings = CacheSettings(ssd_cache_max_size="100GB")
        base_path = Path("/tmp/omlx")
        assert settings.get_ssd_cache_max_size_bytes(base_path) == 100 * 1024**3

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = CacheSettings(
            enabled=False, ssd_cache_dir="/cache", ssd_cache_max_size="50GB"
        )
        result = settings.to_dict()
        assert result == {
            "enabled": False,
            "hot_cache_only": False,
            "ssd_cache_dir": "/cache",
            "ssd_cache_max_size": "50GB",
            "hot_cache_max_size": "0",
            "initial_cache_blocks": 256,
        }

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {
            "enabled": False,
            "ssd_cache_dir": "/cache",
            "ssd_cache_max_size": "200GB",
        }
        settings = CacheSettings.from_dict(data)
        assert settings.enabled is False
        assert settings.ssd_cache_dir == "/cache"
        assert settings.ssd_cache_max_size == "200GB"
        assert settings.initial_cache_blocks == 256  # default

    def test_from_dict_with_initial_cache_blocks(self):
        """Test creation from dictionary with initial_cache_blocks."""
        data = {
            "enabled": True,
            "initial_cache_blocks": 16384,
        }
        settings = CacheSettings.from_dict(data)
        assert settings.initial_cache_blocks == 16384

    def test_from_dict_migrates_hot_cache_auto_to_disabled(self):
        """Legacy hot_cache_max_size=auto should load as disabled."""
        settings = CacheSettings.from_dict({"hot_cache_max_size": "auto"})
        assert settings.hot_cache_max_size == "0"

    def test_initial_cache_blocks_custom(self):
        """Test custom initial_cache_blocks value."""
        settings = CacheSettings(initial_cache_blocks=8192)
        assert settings.initial_cache_blocks == 8192
        result = settings.to_dict()
        assert result["initial_cache_blocks"] == 8192


class TestAuthSettings:
    """Tests for AuthSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = AuthSettings()
        assert settings.api_key is None
        assert settings.secret_key is None
        assert settings.sub_keys == []

    def test_custom_values(self):
        """Test custom values."""
        settings = AuthSettings(api_key="test-secret-key", secret_key="my-secret")
        assert settings.api_key == "test-secret-key"
        assert settings.secret_key == "my-secret"

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = AuthSettings(api_key="my-key")
        result = settings.to_dict()
        assert result == {
            "api_key": "my-key",
            "secret_key": None,
            "skip_api_key_verification": False,
            "sub_keys": [],
        }

    def test_to_dict_with_sub_keys(self):
        """Test conversion to dictionary with sub keys."""
        from omlx.settings import SubKeyEntry

        settings = AuthSettings(
            api_key="my-key",
            sub_keys=[SubKeyEntry(key="sk1", name="Test", created_at="2024-01-01")],
        )
        result = settings.to_dict()
        assert len(result["sub_keys"]) == 1
        assert result["sub_keys"][0]["key"] == "sk1"
        assert result["sub_keys"][0]["name"] == "Test"

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"api_key": "loaded-key", "secret_key": "loaded-secret"}
        settings = AuthSettings.from_dict(data)
        assert settings.api_key == "loaded-key"
        assert settings.secret_key == "loaded-secret"
        assert settings.sub_keys == []

    def test_from_dict_with_sub_keys(self):
        """Test creation from dictionary with sub keys."""
        data = {
            "api_key": "loaded-key",
            "sub_keys": [
                {"key": "sk1", "name": "My Key", "created_at": "2024-01-01"},
            ],
        }
        settings = AuthSettings.from_dict(data)
        assert len(settings.sub_keys) == 1
        assert settings.sub_keys[0].key == "sk1"
        assert settings.sub_keys[0].name == "My Key"

    def test_from_dict_backward_compat(self):
        """Test creation from dictionary without secret_key (backward compat)."""
        data = {"api_key": "loaded-key"}
        settings = AuthSettings.from_dict(data)
        assert settings.api_key == "loaded-key"
        assert settings.secret_key is None
        assert settings.sub_keys == []


class TestMCPSettings:
    """Tests for MCPSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = MCPSettings()
        assert settings.config_path is None

    def test_custom_values(self):
        """Test custom values."""
        settings = MCPSettings(config_path="/path/to/mcp.json")
        assert settings.config_path == "/path/to/mcp.json"

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = MCPSettings(config_path="/mcp/config.json")
        result = settings.to_dict()
        assert result == {"config_path": "/mcp/config.json"}

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"config_path": "/some/path.json"}
        settings = MCPSettings.from_dict(data)
        assert settings.config_path == "/some/path.json"


class TestHuggingFaceSettings:
    """Tests for HuggingFaceSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = HuggingFaceSettings()
        assert settings.endpoint == ""
        assert settings.hf_cache_enabled is True

    def test_custom_values(self):
        """Test custom values."""
        settings = HuggingFaceSettings(
            endpoint="https://hf-mirror.com",
            hf_cache_enabled=False,
        )
        assert settings.endpoint == "https://hf-mirror.com"
        assert settings.hf_cache_enabled is False

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = HuggingFaceSettings(
            endpoint="https://hf-mirror.com",
            hf_cache_enabled=False,
        )
        result = settings.to_dict()
        assert result == {
            "endpoint": "https://hf-mirror.com",
            "hf_cache_enabled": False,
        }

    def test_to_dict_empty(self):
        """Test conversion to dictionary with empty endpoint."""
        settings = HuggingFaceSettings()
        result = settings.to_dict()
        assert result == {"endpoint": "", "hf_cache_enabled": True}

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"endpoint": "https://hf-mirror.com", "hf_cache_enabled": False}
        settings = HuggingFaceSettings.from_dict(data)
        assert settings.endpoint == "https://hf-mirror.com"
        assert settings.hf_cache_enabled is False

    def test_from_dict_defaults(self):
        """Test creation from empty dictionary uses defaults."""
        settings = HuggingFaceSettings.from_dict({})
        assert settings.endpoint == ""
        assert settings.hf_cache_enabled is True


class TestNetworkSettings:
    """Tests for NetworkSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = NetworkSettings()
        assert settings.http_proxy == ""
        assert settings.https_proxy == ""
        assert settings.no_proxy == ""
        assert settings.ca_bundle == ""

    def test_custom_values(self):
        """Test custom values."""
        settings = NetworkSettings(
            http_proxy="http://proxy:8080",
            https_proxy="http://proxy:8080",
            no_proxy="localhost,127.0.0.1",
            ca_bundle="/tmp/corp-ca.pem",
        )
        assert settings.http_proxy == "http://proxy:8080"
        assert settings.https_proxy == "http://proxy:8080"
        assert settings.no_proxy == "localhost,127.0.0.1"
        assert settings.ca_bundle == "/tmp/corp-ca.pem"

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = NetworkSettings(
            http_proxy="http://proxy:8080",
            https_proxy="http://proxy:8080",
            no_proxy="localhost",
            ca_bundle="/tmp/ca.pem",
        )
        result = settings.to_dict()
        assert result == {
            "http_proxy": "http://proxy:8080",
            "https_proxy": "http://proxy:8080",
            "no_proxy": "localhost",
            "ca_bundle": "/tmp/ca.pem",
        }

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {
            "http_proxy": "http://proxy:8080",
            "https_proxy": "http://proxy:8080",
            "no_proxy": "localhost",
            "ca_bundle": "/tmp/ca.pem",
        }
        settings = NetworkSettings.from_dict(data)
        assert settings.http_proxy == "http://proxy:8080"
        assert settings.https_proxy == "http://proxy:8080"
        assert settings.no_proxy == "localhost"
        assert settings.ca_bundle == "/tmp/ca.pem"


class TestLoggingSettings:
    """Tests for LoggingSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = LoggingSettings()
        assert settings.log_dir is None
        assert settings.retention_days == 7

    def test_custom_values(self):
        """Test custom values."""
        settings = LoggingSettings(log_dir="/custom/logs", retention_days=14)
        assert settings.log_dir == "/custom/logs"
        assert settings.retention_days == 14

    def test_get_log_dir_default(self):
        """Test default log directory."""
        settings = LoggingSettings(log_dir=None)
        base_path = Path("/tmp/omlx")
        assert settings.get_log_dir(base_path) == Path("/tmp/omlx/logs")

    def test_get_log_dir_custom(self):
        """Test custom log directory."""
        settings = LoggingSettings(log_dir="/custom/logs")
        base_path = Path("/tmp/omlx")
        assert settings.get_log_dir(base_path) == Path("/custom/logs")

    def test_get_log_dir_with_tilde(self):
        """Test log directory with tilde expansion."""
        settings = LoggingSettings(log_dir="~/logs")
        base_path = Path("/tmp/omlx")
        result = settings.get_log_dir(base_path)
        assert "~" not in str(result)  # Should be expanded

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = LoggingSettings(log_dir="/logs", retention_days=30)
        result = settings.to_dict()
        assert result == {"log_dir": "/logs", "retention_days": 30}

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"log_dir": "/my/logs", "retention_days": 14}
        settings = LoggingSettings.from_dict(data)
        assert settings.log_dir == "/my/logs"
        assert settings.retention_days == 14

    def test_from_dict_with_defaults(self):
        """Test creation from partial dictionary uses defaults."""
        data = {"log_dir": "/custom"}
        settings = LoggingSettings.from_dict(data)
        assert settings.log_dir == "/custom"
        assert settings.retention_days == 7  # default


class TestMemorySettings:
    """Tests for MemorySettings dataclass."""

    def test_defaults(self):
        """Memory guard defaults to balanced tier and guard on."""
        settings = MemorySettings()
        assert settings.prefill_memory_guard is True
        assert settings.memory_guard_tier == "balanced"

    def test_to_dict(self):
        """Test serialization."""
        settings = MemorySettings(memory_guard_tier="safe")
        d = settings.to_dict()
        assert d["memory_guard_tier"] == "safe"
        assert d["prefill_memory_guard"] is True
        assert d["soft_threshold"] == 0.85
        assert d["hard_threshold"] == 0.95
        # Removed fields must not be present.
        assert "max_process_memory" not in d
        assert "max_process_memory_is_explicit" not in d

    def test_to_dict_guard_disabled(self):
        """Test serialization with prefill guard disabled."""
        settings = MemorySettings(prefill_memory_guard=False)
        d = settings.to_dict()
        assert d["prefill_memory_guard"] is False

    def test_from_dict(self):
        """Test deserialization picks up tier value."""
        settings = MemorySettings.from_dict({"memory_guard_tier": "aggressive"})
        assert settings.memory_guard_tier == "aggressive"
        assert settings.prefill_memory_guard is True  # default

    def test_from_dict_defaults(self):
        """Test deserialization with empty dict uses defaults."""
        settings = MemorySettings.from_dict({})
        assert settings.memory_guard_tier == "balanced"
        assert settings.prefill_memory_guard is True

    def test_from_dict_invalid_tier_falls_back_to_balanced(self):
        """Unknown tier values silently degrade to balanced."""
        settings = MemorySettings.from_dict({"memory_guard_tier": "wild"})
        assert settings.memory_guard_tier == "balanced"

    def test_from_dict_ignores_legacy_keys(self):
        """Legacy max_process_memory / is_explicit keys in old settings.json are ignored."""
        settings = MemorySettings.from_dict(
            {
                "max_process_memory": "80%",
                "max_process_memory_is_explicit": True,
                "memory_guard_tier": "safe",
            }
        )
        assert settings.memory_guard_tier == "safe"
        assert not hasattr(settings, "max_process_memory")

    def test_from_dict_guard_disabled(self):
        """Test deserialization with prefill guard disabled."""
        settings = MemorySettings.from_dict({"prefill_memory_guard": False})
        assert settings.prefill_memory_guard is False


class TestGlobalSettings:
    """Tests for GlobalSettings class."""

    def test_defaults(self):
        """Test default values."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            assert settings.server.host == "127.0.0.1"
            assert settings.server.port == 8000
            assert settings.memory.memory_guard_tier == "balanced"
            assert settings.scheduler.max_concurrent_requests == 8
            assert settings.scheduler.embedding_batch_size == 32
            assert settings.cache.enabled is True
            assert settings.auth.api_key is None
            assert settings.mcp.config_path is None

    def test_get_effective_model_dirs_includes_hf_cache_between_dirs(
        self, tmp_path, monkeypatch
    ):
        """HF cache is inserted between primary and additional model dirs."""
        primary = tmp_path / "primary"
        additional = tmp_path / "additional"
        hf_cache = tmp_path / "hf" / "hub"
        primary.mkdir()
        additional.mkdir()
        hf_cache.mkdir(parents=True)
        monkeypatch.setenv("HF_HUB_CACHE", str(hf_cache))

        settings = GlobalSettings(base_path=tmp_path / "omlx")
        settings.model.model_dirs = [str(primary), str(additional)]

        assert settings.get_effective_model_dirs() == [
            primary.resolve(),
            hf_cache.resolve(),
            additional.resolve(),
        ]

    def test_get_effective_model_dirs_skips_disabled_hf_cache(
        self, tmp_path, monkeypatch
    ):
        """Disabled HF cache is not included in discovery dirs."""
        primary = tmp_path / "primary"
        hf_cache = tmp_path / "hf" / "hub"
        primary.mkdir()
        hf_cache.mkdir(parents=True)
        monkeypatch.setenv("HF_HUB_CACHE", str(hf_cache))

        settings = GlobalSettings(base_path=tmp_path / "omlx")
        settings.model.model_dirs = [str(primary)]
        settings.huggingface.hf_cache_enabled = False

        assert settings.get_effective_model_dirs() == [primary.resolve()]

    def test_cli_override_memory_guard_tier(self, tmp_path):
        """CLI memory guard tier should override loaded settings."""
        args = Namespace(memory_guard="safe", memory_guard_gb=None)
        settings = GlobalSettings.load(base_path=tmp_path, cli_args=args)

        assert settings.memory.memory_guard_tier == "safe"
        assert settings.memory.memory_guard_custom_ceiling_gb == 0.0

    def test_cli_override_memory_guard_gb_sets_custom_tier(self, tmp_path):
        """CLI memory guard GB should select custom tier automatically."""
        args = Namespace(memory_guard=None, memory_guard_gb=48.0)
        settings = GlobalSettings.load(base_path=tmp_path, cli_args=args)

        assert settings.memory.memory_guard_tier == "custom"
        assert settings.memory.memory_guard_custom_ceiling_gb == 48.0

    def test_load_from_file(self):
        """Test loading settings from JSON file."""
        with tempfile.TemporaryDirectory() as tmpdir:
            # Create settings file
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps(
                    {
                        "version": "1.0",
                        "server": {"port": 9000},
                        "auth": {"api_key": "test-key"},
                    }
                )
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.port == 9000
            assert settings.auth.api_key == "test-key"

    def test_load_from_file_all_sections(self):
        """Test loading all settings sections from file."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps(
                    {
                        "version": "1.0",
                        "server": {
                            "host": "0.0.0.0",
                            "port": 9000,
                            "log_level": "debug",
                        },
                        "model": {"model_dir": "/models"},
                        "memory": {"memory_guard_tier": "safe"},
                        "scheduler": {
                            "max_concurrent_requests": 128,
                            "embedding_batch_size": 24,
                        },
                        "cache": {
                            "enabled": False,
                            "ssd_cache_dir": "/cache",
                            "ssd_cache_max_size": "50GB",
                        },
                        "auth": {"api_key": "secret"},
                        "mcp": {"config_path": "/mcp.json"},
                    }
                )
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.host == "0.0.0.0"
            assert settings.server.port == 9000
            assert settings.server.log_level == "debug"
            assert settings.model.model_dirs == ["/models"]  # Migrated from model_dir
            assert settings.model.model_dir == "/models"  # Backward compat field
            assert settings.memory.memory_guard_tier == "safe"
            assert settings.scheduler.max_concurrent_requests == 128
            assert settings.scheduler.embedding_batch_size == 24
            assert settings.cache.enabled is False
            assert settings.cache.ssd_cache_dir == "/cache"
            assert settings.auth.api_key == "secret"
            assert settings.mcp.config_path == "/mcp.json"

    def test_load_nonexistent_file_uses_defaults(self):
        """Test loading with no settings file uses defaults."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.host == "127.0.0.1"
            assert settings.server.port == 8000

    def test_load_invalid_json_uses_defaults(self):
        """Test loading invalid JSON file logs warning and uses defaults."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text("{ invalid json }")

            settings = GlobalSettings.load(base_path=tmpdir)
            # Should use defaults due to parse error
            assert settings.server.port == 8000

    def test_save(self):
        """Test saving settings to file."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            settings.server.port = 9001
            settings.auth.api_key = "saved-key"
            settings.save()

            # Verify file was created
            settings_file = Path(tmpdir) / "settings.json"
            assert settings_file.exists()

            # Verify content
            data = json.loads(settings_file.read_text())
            assert data["version"] == "1.0"
            assert data["server"]["port"] == 9001
            assert data["auth"]["api_key"] == "saved-key"

    def test_save_and_load_cors_origins(self):
        """Test saving and loading cors_origins through settings file."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            settings.server.cors_origins = ["https://chat.example.com"]
            settings.save()

            loaded = GlobalSettings.load(base_path=tmpdir)
            assert loaded.server.cors_origins == ["https://chat.example.com"]

    def test_load_cors_origins_from_file(self):
        """Test loading cors_origins from settings.json."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps(
                    {
                        "version": "1.0",
                        "server": {
                            "port": 8000,
                            "cors_origins": [
                                "https://chat.example.com",
                                "http://localhost:3000",
                            ],
                        },
                    }
                )
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.cors_origins == [
                "https://chat.example.com",
                "http://localhost:3000",
            ]

    def test_load_without_cors_origins_uses_default(self):
        """Test that missing cors_origins in settings.json uses default ['*']."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps({"version": "1.0", "server": {"port": 9000}})
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.cors_origins == ["*"]

    def test_save_creates_directory(self):
        """Test save creates base directory if needed."""
        with tempfile.TemporaryDirectory() as tmpdir:
            base = Path(tmpdir) / "nested" / "omlx"
            settings = GlobalSettings(base_path=base)
            settings.save()

            assert base.exists()
            assert (base / "settings.json").exists()

    def test_ensure_directories(self):
        """Test directory creation."""
        with tempfile.TemporaryDirectory() as tmpdir:
            base = Path(tmpdir) / "omlx"
            settings = GlobalSettings(base_path=base)
            settings.ensure_directories()

            assert base.exists()
            assert (base / "models").exists()
            assert (base / "cache").exists()
            assert (base / "logs").exists()

    def test_ensure_directories_custom_paths(self):
        """Test directory creation with custom paths."""
        with tempfile.TemporaryDirectory() as tmpdir:
            base = Path(tmpdir) / "omlx"
            custom_models = Path(tmpdir) / "custom_models"
            custom_cache = Path(tmpdir) / "custom_cache"
            custom_logs = Path(tmpdir) / "custom_logs"

            settings = GlobalSettings(base_path=base)
            settings.model.model_dir = str(custom_models)
            settings.cache.ssd_cache_dir = str(custom_cache)
            settings.logging.log_dir = str(custom_logs)
            settings.ensure_directories()

            assert base.exists()
            assert custom_models.exists()
            assert custom_cache.exists()
            assert custom_logs.exists()

    def test_ensure_directories_unavailable_model_dir(self):
        """Test that unavailable model dirs are skipped instead of crashing."""
        with tempfile.TemporaryDirectory() as tmpdir:
            base = Path(tmpdir) / "omlx"
            valid_models = Path(tmpdir) / "valid_models"
            unavailable = Path("/Volumes/NonExistentDrive/Models")

            settings = GlobalSettings(base_path=base)
            settings.model.model_dirs = [str(valid_models), str(unavailable)]
            settings.ensure_directories()

            assert base.exists()
            assert valid_models.exists()
            # Unavailable path should be removed from model_dirs
            resolved_dirs = settings.model.get_model_dirs(base)
            assert len(resolved_dirs) == 1
            assert resolved_dirs[0] == valid_models.resolve()

    def test_ensure_directories_unreadable_model_dir(self, tmp_path, monkeypatch):
        """Test that existing but unreadable model dirs are skipped."""
        base = tmp_path / "omlx"
        valid_models = tmp_path / "valid_models"
        unreadable = tmp_path / "unreadable_models"
        unreadable.mkdir()

        original_iterdir = Path.iterdir

        def fake_iterdir(path):
            if path == unreadable.resolve():
                raise PermissionError("Operation not permitted")
            return original_iterdir(path)

        monkeypatch.setattr(Path, "iterdir", fake_iterdir)

        settings = GlobalSettings(base_path=base)
        settings.model.model_dirs = [str(valid_models), str(unreadable)]
        settings.ensure_directories()

        resolved_dirs = settings.model.get_model_dirs(base)
        assert resolved_dirs == [valid_models.resolve()]

    def test_validate_valid_settings(self):
        """Test validation with valid settings."""
        settings = GlobalSettings()
        errors = settings.validate()
        assert errors == []

    def test_validate_context_window_policy(self):
        """Sampling context policy must be positive when set."""
        settings = GlobalSettings()
        settings.sampling.max_context_window_policy = 128000
        assert settings.validate() == []

        settings.sampling.max_context_window_policy = 0
        errors = settings.validate()
        assert any("max_context_window_policy" in e for e in errors)

    def test_validate_invalid_port_low(self):
        """Test validation catches port below 1."""
        settings = GlobalSettings()
        settings.server.port = 0
        errors = settings.validate()
        assert any("port" in e.lower() for e in errors)

    def test_validate_invalid_port_high(self):
        """Test validation catches port above 65535."""
        settings = GlobalSettings()
        settings.server.port = 70000
        errors = settings.validate()
        assert any("port" in e.lower() for e in errors)

    def test_validate_invalid_log_level(self):
        """Test validation catches invalid log level."""
        settings = GlobalSettings()
        settings.server.log_level = "invalid"
        errors = settings.validate()
        assert any("log_level" in e.lower() for e in errors)

    def test_validate_valid_log_levels(self):
        """Test validation accepts all valid log levels."""
        for level in ["trace", "debug", "info", "warning", "error", "critical"]:
            settings = GlobalSettings()
            settings.server.log_level = level
            errors = settings.validate()
            assert errors == []

    def test_validate_invalid_sse_keepalive_mode(self):
        """Validation rejects unknown sse_keepalive_mode values."""
        settings = GlobalSettings()
        settings.server.sse_keepalive_mode = "bogus"
        errors = settings.validate()
        assert any("sse_keepalive_mode" in e for e in errors)

    def test_validate_valid_sse_keepalive_modes(self):
        """Validation accepts chunk / comment / off."""
        for mode in ("chunk", "comment", "off"):
            settings = GlobalSettings()
            settings.server.sse_keepalive_mode = mode
            errors = settings.validate()
            assert errors == []

    def test_validate_memory_guard_tier_valid(self):
        """Test validation accepts each known tier."""
        for tier in ("safe", "balanced", "aggressive"):
            settings = GlobalSettings()
            settings.memory.memory_guard_tier = tier
            errors = settings.validate()
            assert not any("memory_guard_tier" in e for e in errors)

        settings = GlobalSettings()
        settings.memory.memory_guard_tier = "custom"
        settings.memory.memory_guard_custom_ceiling_gb = 48.0
        errors = settings.validate()
        assert not any("memory_guard_tier" in e for e in errors)
        assert not any("memory_guard_custom_ceiling_gb" in e for e in errors)

    def test_validate_memory_guard_tier_invalid(self):
        """Test validation flags unknown tier values."""
        settings = GlobalSettings()
        settings.memory.memory_guard_tier = "extreme"  # type: ignore[assignment]
        errors = settings.validate()
        assert any("memory_guard_tier" in e for e in errors)

    def test_validate_invalid_scheduler_values(self):
        """Test validation catches invalid scheduler values."""
        settings = GlobalSettings()
        settings.scheduler.max_concurrent_requests = 0
        errors = settings.validate()
        assert any("max_concurrent_requests" in e.lower() for e in errors)

        settings = GlobalSettings()
        settings.scheduler.embedding_batch_size = 0
        errors = settings.validate()
        assert any("embedding_batch_size" in e.lower() for e in errors)

    def test_validate_invalid_cache_size(self):
        """Test validation catches invalid cache size."""
        settings = GlobalSettings()
        settings.cache.ssd_cache_max_size = "not-a-size"
        errors = settings.validate()
        assert any("ssd_cache_max_size" in e.lower() for e in errors)

    def test_validate_hot_cache_size(self):
        """Hot cache accepts explicit sizes only; auto is SSD-cache-only."""
        settings = GlobalSettings()
        settings.cache.hot_cache_max_size = "0"
        assert not any("hot_cache_max_size" in e for e in settings.validate())

        settings.cache.hot_cache_max_size = "8GB"
        assert not any("hot_cache_max_size" in e for e in settings.validate())

        settings.cache.hot_cache_max_size = "auto"
        errors = settings.validate()
        assert any("hot_cache_max_size" in e for e in errors)
        assert any("auto" in e for e in errors)

        settings.cache.hot_cache_max_size = "not-a-size"
        errors = settings.validate()
        assert any("hot_cache_max_size" in e for e in errors)

    def test_validate_invalid_initial_cache_blocks(self):
        """Test validation catches invalid initial_cache_blocks."""
        settings = GlobalSettings()
        settings.cache.initial_cache_blocks = 0
        errors = settings.validate()
        assert any("initial_cache_blocks" in e.lower() for e in errors)

        settings = GlobalSettings()
        settings.cache.initial_cache_blocks = -1
        errors = settings.validate()
        assert any("initial_cache_blocks" in e.lower() for e in errors)

    def test_validate_multiple_errors(self):
        """Test validation returns multiple errors."""
        settings = GlobalSettings()
        settings.server.port = 0
        settings.scheduler.max_concurrent_requests = -1
        settings.memory.memory_guard_tier = "extreme"  # type: ignore[assignment]
        errors = settings.validate()
        assert len(errors) >= 3

    def test_validate_hf_endpoint_empty_ok(self):
        """Test empty HuggingFace endpoint passes validation."""
        settings = GlobalSettings()
        settings.huggingface.endpoint = ""
        errors = settings.validate()
        assert not any("huggingface" in e.lower() for e in errors)

    def test_validate_hf_endpoint_valid(self):
        """Test valid HuggingFace endpoint passes validation."""
        settings = GlobalSettings()
        settings.huggingface.endpoint = "https://hf-mirror.com"
        errors = settings.validate()
        assert not any("huggingface" in e.lower() for e in errors)

    def test_validate_hf_endpoint_invalid(self):
        """Test invalid HuggingFace endpoint fails validation."""
        settings = GlobalSettings()
        settings.huggingface.endpoint = "not-a-url"
        errors = settings.validate()
        assert any("huggingface" in e.lower() for e in errors)

    def test_env_override_server(self):
        """Test environment variable override for server settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {
                    "OMLX_HOST": "0.0.0.0",
                    "OMLX_PORT": "9999",
                    "OMLX_LOG_LEVEL": "debug",
                },
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.server.host == "0.0.0.0"
                assert settings.server.port == 9999
                assert settings.server.log_level == "debug"

    def test_env_override_model(self):
        """Test environment variable override for model settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {
                    "OMLX_MODEL_DIR": "/env/models",
                },
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.model.model_dir == "/env/models"

    def test_env_override_scheduler(self):
        """Test environment variable override for scheduler settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {"OMLX_MAX_CONCURRENT_REQUESTS": "512"},
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.scheduler.max_concurrent_requests == 512

    def test_env_override_embedding_batch_size(self):
        """Test environment variable override for embedding batch size."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {"OMLX_EMBEDDING_BATCH_SIZE": "24"},
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.scheduler.embedding_batch_size == 24

    def test_env_override_scheduler_legacy_fallback(self):
        """Test legacy OMLX_MAX_NUM_SEQS env var is accepted as fallback."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {"OMLX_MAX_NUM_SEQS": "256"},
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.scheduler.max_concurrent_requests == 256

    def test_env_override_cache(self):
        """Test environment variable override for cache settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {
                    "OMLX_CACHE_ENABLED": "false",
                    "OMLX_SSD_CACHE_DIR": "/env/cache",
                    "OMLX_SSD_CACHE_MAX_SIZE": "200GB",
                },
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.cache.enabled is False
                assert settings.cache.ssd_cache_dir == "/env/cache"
                assert settings.cache.ssd_cache_max_size == "200GB"

    def test_env_override_initial_cache_blocks(self):
        """Test environment variable override for initial_cache_blocks."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {"OMLX_INITIAL_CACHE_BLOCKS": "16384"},
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.cache.initial_cache_blocks == 16384

    def test_env_override_cache_enabled_values(self):
        """Test various values for OMLX_CACHE_ENABLED."""
        with tempfile.TemporaryDirectory() as tmpdir:
            for value in ["true", "1", "yes"]:
                with patch.dict(os.environ, {"OMLX_CACHE_ENABLED": value}, clear=False):
                    settings = GlobalSettings.load(base_path=tmpdir)
                    assert settings.cache.enabled is True

            for value in ["false", "0", "no"]:
                with patch.dict(os.environ, {"OMLX_CACHE_ENABLED": value}, clear=False):
                    settings = GlobalSettings.load(base_path=tmpdir)
                    assert settings.cache.enabled is False

    def test_env_override_auth(self):
        """Test environment variable override for auth settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(os.environ, {"OMLX_API_KEY": "env-key"}, clear=False):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.auth.api_key == "env-key"

    def test_env_override_mcp(self):
        """Test environment variable override for MCP settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ, {"OMLX_MCP_CONFIG": "/env/mcp.json"}, clear=False
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.mcp.config_path == "/env/mcp.json"

    def test_env_override_hf_endpoint(self):
        """Test environment variable override for HuggingFace settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {"OMLX_HF_ENDPOINT": "https://hf-mirror.com"},
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.huggingface.endpoint == "https://hf-mirror.com"

    def test_env_override_network(self):
        """Test environment variable override for network proxy settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(
                os.environ,
                {
                    "OMLX_HTTP_PROXY": "http://proxy.company.com:8080",
                    "OMLX_HTTPS_PROXY": "http://proxy.company.com:8443",
                    "OMLX_NO_PROXY": "localhost,127.0.0.1",
                    "OMLX_CA_BUNDLE": "/tmp/corp-ca.pem",
                },
                clear=False,
            ):
                settings = GlobalSettings.load(base_path=tmpdir)
                assert settings.network.http_proxy == "http://proxy.company.com:8080"
                assert settings.network.https_proxy == "http://proxy.company.com:8443"
                assert settings.network.no_proxy == "localhost,127.0.0.1"
                assert settings.network.ca_bundle == "/tmp/corp-ca.pem"

    def test_env_override_invalid_port_logs_warning(self):
        """Test invalid OMLX_PORT logs warning and keeps default."""
        with tempfile.TemporaryDirectory() as tmpdir:
            with patch.dict(os.environ, {"OMLX_PORT": "not-a-number"}, clear=False):
                settings = GlobalSettings.load(base_path=tmpdir)
                # Should keep default due to parse error
                assert settings.server.port == 8000

    def test_env_override_after_file(self):
        """Test env vars override file settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            # Create settings file
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps({"version": "1.0", "server": {"port": 9000}})
            )

            with patch.dict(os.environ, {"OMLX_PORT": "8888"}, clear=False):
                settings = GlobalSettings.load(base_path=tmpdir)
                # Env should override file
                assert settings.server.port == 8888

    def test_cli_override(self):
        """Test CLI argument override."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(
                port=8888,
                host="0.0.0.0",
                log_level="warning",
                model_dir="/cli/models",
                api_key="cli-key",
            )
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.server.port == 8888
            assert settings.server.host == "0.0.0.0"
            assert settings.server.log_level == "warning"
            assert settings.model.model_dir == "/cli/models"
            assert settings.auth.api_key == "cli-key"

    def test_cli_override_partial(self):
        """Test CLI override with some None values."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(port=7777, host=None, log_level=None)
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.server.port == 7777
            assert settings.server.host == "127.0.0.1"  # default
            assert settings.server.log_level == "info"  # default

    def test_cli_override_scheduler(self):
        """Test CLI override for scheduler settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(max_concurrent_requests=64, embedding_batch_size=12)
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.scheduler.max_concurrent_requests == 64
            assert settings.scheduler.embedding_batch_size == 12

    def test_cli_override_cache(self):
        """Test CLI override for cache settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(
                cache_enabled=False,
                ssd_cache_dir="/cli/cache",
                ssd_cache_max_size="500GB",
            )
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.cache.enabled is False
            assert settings.cache.ssd_cache_dir == "/cli/cache"
            assert settings.cache.ssd_cache_max_size == "500GB"

    def test_cli_override_initial_cache_blocks(self):
        """Test CLI override for initial_cache_blocks."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(initial_cache_blocks=4096)
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.cache.initial_cache_blocks == 4096

    def test_cli_override_mcp(self):
        """Test CLI override for MCP settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(mcp_config="/cli/mcp.json")
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.mcp.config_path == "/cli/mcp.json"

    def test_cli_override_network(self):
        """Test CLI override for network proxy settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(
                http_proxy="http://proxy.company.com:8080",
                https_proxy="http://proxy.company.com:8443",
                no_proxy="localhost,127.0.0.1",
                ca_bundle="/tmp/corp-ca.pem",
            )
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.network.http_proxy == "http://proxy.company.com:8080"
            assert settings.network.https_proxy == "http://proxy.company.com:8443"
            assert settings.network.no_proxy == "localhost,127.0.0.1"
            assert settings.network.ca_bundle == "/tmp/corp-ca.pem"

    def test_validate_invalid_http_proxy(self):
        """Test invalid http_proxy fails validation."""
        settings = GlobalSettings()
        settings.network.http_proxy = "proxy.company.com:8080"
        errors = settings.validate()
        assert any("http_proxy" in e.lower() for e in errors)

    def test_validate_invalid_https_proxy(self):
        """Test invalid https_proxy fails validation."""
        settings = GlobalSettings()
        settings.network.https_proxy = "proxy.company.com:8443"
        errors = settings.validate()
        assert any("https_proxy" in e.lower() for e in errors)

    def test_validate_valid_network_proxy(self):
        """Test valid network proxy values pass validation."""
        settings = GlobalSettings()
        settings.network.http_proxy = "http://proxy.company.com:8080"
        settings.network.https_proxy = "http://proxy.company.com:8443"
        errors = settings.validate()
        assert not any("http_proxy" in e.lower() for e in errors)
        assert not any("https_proxy" in e.lower() for e in errors)

    def test_priority_cli_over_env_over_file(self):
        """Test that CLI > env > file > defaults priority is respected."""
        with tempfile.TemporaryDirectory() as tmpdir:
            # Create settings file with port 9000
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps({"version": "1.0", "server": {"port": 9000}})
            )

            # Set env to port 8888
            with patch.dict(os.environ, {"OMLX_PORT": "8888"}, clear=False):
                # CLI sets port to 7777
                args = Namespace(port=7777)
                settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
                # CLI should win
                assert settings.server.port == 7777

            # Without CLI, env should win over file
            settings = GlobalSettings.load(base_path=tmpdir)
            # Env is no longer set, so file should be used
            assert settings.server.port == 9000

    def test_to_dict(self):
        """Test conversion to dictionary."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            settings.server.port = 9000
            result = settings.to_dict()

            assert result["version"] == "1.0"
            assert result["base_path"] == tmpdir
            assert result["server"]["port"] == 9000
            assert "model" in result
            assert "scheduler" in result
            assert "cache" in result
            assert "auth" in result
            assert "mcp" in result

    def test_to_scheduler_config(self):
        """Test conversion to SchedulerConfig."""
        settings = GlobalSettings()
        settings.scheduler.max_concurrent_requests = 128
        settings.scheduler.embedding_batch_size = 12

        scheduler_config = settings.to_scheduler_config()
        assert scheduler_config.max_num_seqs == 128
        assert scheduler_config.completion_batch_size == 128
        assert scheduler_config.embedding_batch_size == 12
        assert scheduler_config.initial_cache_blocks == 256  # default

    def test_to_scheduler_config_initial_cache_blocks(self):
        """Test that initial_cache_blocks passes through to SchedulerConfig."""
        settings = GlobalSettings()
        settings.cache.initial_cache_blocks = 8192

        scheduler_config = settings.to_scheduler_config()
        assert scheduler_config.initial_cache_blocks == 8192


class TestInitSettings:
    """Tests for init_settings and get_settings."""

    def setup_method(self):
        """Reset settings before each test."""
        reset_settings()

    def teardown_method(self):
        """Reset settings after each test."""
        reset_settings()

    def test_init_settings(self):
        """Test initializing global settings."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = init_settings(base_path=tmpdir)
            assert settings is not None
            assert get_settings() is settings

    def test_init_settings_with_cli_args(self):
        """Test initializing with CLI arguments."""
        with tempfile.TemporaryDirectory() as tmpdir:
            args = Namespace(port=9999)
            settings = init_settings(base_path=tmpdir, cli_args=args)
            assert settings.server.port == 9999
            assert get_settings().server.port == 9999

    def test_get_settings_uninitialized_raises(self):
        """Test get_settings raises RuntimeError when not initialized."""
        with pytest.raises(RuntimeError, match="Settings not initialized"):
            get_settings()

    def test_reset_settings(self):
        """Test resetting settings allows re-initialization."""
        with tempfile.TemporaryDirectory() as tmpdir:
            # Initialize first
            init_settings(base_path=tmpdir)
            assert get_settings() is not None

            # Reset
            reset_settings()

            # Should raise now
            with pytest.raises(RuntimeError):
                get_settings()

            # Can initialize again
            settings = init_settings(base_path=tmpdir)
            assert settings is not None

    def test_multiple_init_overwrites(self):
        """Test calling init_settings multiple times overwrites."""
        with (
            tempfile.TemporaryDirectory() as tmpdir1,
            tempfile.TemporaryDirectory() as tmpdir2,
        ):
            settings1 = init_settings(base_path=tmpdir1)
            settings2 = init_settings(base_path=tmpdir2)

            assert get_settings() is settings2
            # Use resolve() to handle macOS /var -> /private/var symlink
            assert get_settings().base_path.resolve() == Path(tmpdir2).resolve()


class TestHelperFunctions:
    """Tests for helper functions."""

    def test_get_system_memory(self):
        """Test system memory detection."""
        memory = get_system_memory()
        assert memory > 0
        # Should be at least 1GB on any modern system
        assert memory >= 1024**3

    def test_get_system_memory_returns_int(self):
        """Test that get_system_memory returns an integer."""
        memory = get_system_memory()
        assert isinstance(memory, int)

    def test_get_system_memory_uses_sysconf_before_compat(self):
        """macOS should not depend on psutil's HOST_VM_INFO64 adapter."""

        def fake_sysconf(name):
            if name == "SC_PHYS_PAGES":
                return 123
            if name == "SC_PAGE_SIZE":
                return 4096
            raise ValueError(name)

        with (
            patch("omlx.settings.os.sysconf", side_effect=fake_sysconf),
            patch(
                "omlx.utils.psutil_compat.get_total_memory",
                side_effect=AssertionError("compat should not be called"),
            ),
        ):
            assert get_system_memory() == 123 * 4096

    def test_get_system_memory_falls_back_to_compat_when_sysconf_fails(self):
        with (
            patch("omlx.settings.os.sysconf", side_effect=ValueError("unsupported")),
            patch(
                "omlx.utils.psutil_compat.get_total_memory",
                return_value=32 * 1024**3,
            ),
        ):
            assert get_system_memory() == 32 * 1024**3

    def test_get_ssd_capacity(self):
        """Test SSD capacity detection."""
        capacity = get_ssd_capacity(Path("/"))
        assert capacity > 0

    def test_get_ssd_capacity_returns_int(self):
        """Test that get_ssd_capacity returns an integer."""
        capacity = get_ssd_capacity(Path("/"))
        assert isinstance(capacity, int)

    def test_get_ssd_capacity_nonexistent_path(self):
        """Test SSD capacity for non-existent path uses parent."""
        with tempfile.TemporaryDirectory() as tmpdir:
            nonexistent = Path(tmpdir) / "does" / "not" / "exist"
            capacity = get_ssd_capacity(nonexistent)
            assert capacity > 0

    def test_get_ssd_capacity_with_string_path(self):
        """Test SSD capacity with string path."""
        capacity = get_ssd_capacity("/")
        assert capacity > 0

    def test_get_ssd_capacity_with_tilde(self):
        """Test SSD capacity with tilde path expansion."""
        capacity = get_ssd_capacity("~/")
        assert capacity > 0


class TestResolveDefaultBasePath:
    """Tests for resolve_default_base_path()."""

    def test_falls_back_to_default_when_nothing_configured(self, monkeypatch):
        monkeypatch.delenv("OMLX_BASE_PATH", raising=False)
        monkeypatch.setattr(
            "omlx.settings.BASE_PATH_BOOTSTRAP_FILE",
            Path("/nonexistent/oMLX/base-path"),
        )
        assert resolve_default_base_path() == Path.home() / ".omlx"

    def test_uses_bootstrap_file_when_present(self, monkeypatch, tmp_path):
        monkeypatch.delenv("OMLX_BASE_PATH", raising=False)
        custom_base = tmp_path / "external-ssd" / "omlx-data"
        bootstrap_file = tmp_path / "base-path"
        bootstrap_file.write_text(f"{custom_base}\n", encoding="utf-8")
        monkeypatch.setattr("omlx.settings.BASE_PATH_BOOTSTRAP_FILE", bootstrap_file)

        assert resolve_default_base_path() == custom_base.resolve()

    def test_env_var_wins_over_bootstrap_file(self, monkeypatch, tmp_path):
        env_base = tmp_path / "env-base"
        bootstrap_base = tmp_path / "bootstrap-base"
        bootstrap_file = tmp_path / "base-path"
        bootstrap_file.write_text(str(bootstrap_base), encoding="utf-8")
        monkeypatch.setattr("omlx.settings.BASE_PATH_BOOTSTRAP_FILE", bootstrap_file)
        monkeypatch.setenv("OMLX_BASE_PATH", str(env_base))

        assert resolve_default_base_path() == env_base.resolve()

    def test_empty_bootstrap_file_falls_back_to_default(self, monkeypatch, tmp_path):
        monkeypatch.delenv("OMLX_BASE_PATH", raising=False)
        bootstrap_file = tmp_path / "base-path"
        bootstrap_file.write_text("   \n", encoding="utf-8")
        monkeypatch.setattr("omlx.settings.BASE_PATH_BOOTSTRAP_FILE", bootstrap_file)

        assert resolve_default_base_path() == Path.home() / ".omlx"

    def test_global_settings_load_uses_resolver_when_no_base_path_given(
        self, monkeypatch, tmp_path
    ):
        resolved = tmp_path / "resolved-base"
        monkeypatch.setattr(
            "omlx.settings.resolve_default_base_path", lambda: resolved
        )

        settings = GlobalSettings.load()

        assert settings.base_path == resolved


class TestSettingsVersionMigration:
    """Tests for settings version handling."""

    def test_load_different_version_logs_migration(self):
        """Test loading settings with different version logs migration."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps({"version": "0.9", "server": {"port": 9000}})
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            # Should still load the settings
            assert settings.server.port == 9000

    def test_load_without_version(self):
        """Test loading settings file without version field."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(json.dumps({"server": {"port": 9000}}))

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.port == 9000


class TestSettingsEdgeCases:
    """Tests for edge cases and error handling."""

    def test_empty_settings_file(self):
        """Test loading empty settings file."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text("{}")

            settings = GlobalSettings.load(base_path=tmpdir)
            # Should use all defaults
            assert settings.server.port == 8000
            assert settings.server.host == "127.0.0.1"

    def test_partial_section_in_file(self):
        """Test loading file with partial section data."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings_file = Path(tmpdir) / "settings.json"
            settings_file.write_text(
                json.dumps(
                    {
                        "version": "1.0",
                        "server": {"port": 9000},
                        # host and log_level should use defaults
                    }
                )
            )

            settings = GlobalSettings.load(base_path=tmpdir)
            assert settings.server.port == 9000
            assert settings.server.host == "127.0.0.1"  # default
            assert settings.server.log_level == "info"  # default

    def test_cli_args_without_expected_attrs(self):
        """Test CLI args object without all expected attributes."""
        with tempfile.TemporaryDirectory() as tmpdir:
            # Minimal args object
            args = Namespace(port=9000)
            settings = GlobalSettings.load(base_path=tmpdir, cli_args=args)
            assert settings.server.port == 9000
            # Other settings should be defaults
            assert settings.server.host == "127.0.0.1"

    def test_save_with_unicode_api_key(self):
        """Test saving settings with unicode in values."""
        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            settings.auth.api_key = "key-with-unicode-\u4e2d\u6587"
            settings.save()

            # Reload and verify
            loaded = GlobalSettings.load(base_path=tmpdir)
            assert loaded.auth.api_key == "key-with-unicode-\u4e2d\u6587"


class TestSamplingSettings:
    """Tests for SamplingSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = SamplingSettings()
        # Fallback default kept at 32768 so existing settings.json
        # files carrying the historical default keep working unchanged
        # after upgrade. ``max_context_window_policy`` is the explicit
        # operator policy cap (None by default).
        assert settings.max_context_window == 32768
        assert settings.max_context_window_policy is None
        assert settings.max_tokens == 32768
        assert settings.temperature == 1.0
        assert settings.top_p == 0.95
        assert settings.top_k == 0
        assert settings.repetition_penalty == 1.0

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = SamplingSettings(max_context_window=4096)
        d = settings.to_dict()
        assert d["max_context_window"] == 4096
        assert "max_tokens" in d
        assert "repetition_penalty" in d

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {
            "max_context_window": 8192,
            "max_tokens": 1024,
            "repetition_penalty": 1.2,
        }
        settings = SamplingSettings.from_dict(data)
        assert settings.max_context_window == 8192
        assert settings.max_tokens == 1024
        assert settings.repetition_penalty == 1.2

    def test_from_dict_defaults(self):
        """Test from_dict uses defaults for missing fields."""
        settings = SamplingSettings.from_dict({})
        assert settings.max_context_window == 32768
        assert settings.max_context_window_policy is None
        assert settings.repetition_penalty == 1.0

    def test_policy_field_round_trip(self):
        """``max_context_window_policy`` must serialize and
        deserialize without losing its ``None`` semantics."""
        unset = SamplingSettings.from_dict({})
        assert unset.max_context_window_policy is None
        # to_dict preserves None
        d = unset.to_dict()
        assert d["max_context_window_policy"] is None
        # Setting an explicit value round-trips
        with_policy = SamplingSettings.from_dict({"max_context_window_policy": 128_000})
        assert with_policy.max_context_window_policy == 128_000
        assert with_policy.to_dict()["max_context_window_policy"] == 128_000


class TestClaudeCodeSettings:
    """Tests for ClaudeCodeSettings dataclass."""

    def test_defaults(self):
        """Test default values."""
        settings = ClaudeCodeSettings()
        assert settings.context_scaling_enabled is False
        assert settings.target_context_size == 200000

    def test_custom_values(self):
        """Test custom values."""
        settings = ClaudeCodeSettings(
            context_scaling_enabled=True, target_context_size=131072
        )
        assert settings.context_scaling_enabled is True
        assert settings.target_context_size == 131072

    def test_to_dict(self):
        """Test conversion to dictionary."""
        settings = ClaudeCodeSettings(
            context_scaling_enabled=True, target_context_size=100000
        )
        result = settings.to_dict()
        assert result["context_scaling_enabled"] is True
        assert result["target_context_size"] == 100000
        assert result["mode"] == "cloud"
        assert result["opus_model"] is None
        assert result["sonnet_model"] is None
        assert result["haiku_model"] is None

    def test_from_dict(self):
        """Test creation from dictionary."""
        data = {"context_scaling_enabled": True, "target_context_size": 131072}
        settings = ClaudeCodeSettings.from_dict(data)
        assert settings.context_scaling_enabled is True
        assert settings.target_context_size == 131072

    def test_from_dict_defaults(self):
        """Test from_dict uses defaults for missing fields."""
        settings = ClaudeCodeSettings.from_dict({})
        assert settings.context_scaling_enabled is False
        assert settings.target_context_size == 200000

    def test_new_fields_defaults(self):
        """Test that the four new fields have correct defaults."""
        settings = ClaudeCodeSettings()
        assert settings.mode == "cloud"
        assert settings.opus_model is None
        assert settings.sonnet_model is None
        assert settings.haiku_model is None

    def test_new_fields_to_dict(self):
        """Test that to_dict includes all four new fields."""
        settings = ClaudeCodeSettings(
            mode="local",
            opus_model="mlx-community/Qwen3-30B-A3B-4bit",
            sonnet_model="mlx-community/Qwen3-14B-4bit",
            haiku_model="mlx-community/Qwen3-4B-4bit",
        )
        result = settings.to_dict()
        assert result["mode"] == "local"
        assert result["opus_model"] == "mlx-community/Qwen3-30B-A3B-4bit"
        assert result["sonnet_model"] == "mlx-community/Qwen3-14B-4bit"
        assert result["haiku_model"] == "mlx-community/Qwen3-4B-4bit"

    def test_new_fields_from_dict_full(self):
        """Test from_dict with all four new fields present."""
        data = {
            "mode": "local",
            "opus_model": "mlx-community/Qwen3-30B-A3B-4bit",
            "sonnet_model": "mlx-community/Qwen3-14B-4bit",
            "haiku_model": "mlx-community/Qwen3-4B-4bit",
        }
        settings = ClaudeCodeSettings.from_dict(data)
        assert settings.mode == "local"
        assert settings.opus_model == "mlx-community/Qwen3-30B-A3B-4bit"
        assert settings.sonnet_model == "mlx-community/Qwen3-14B-4bit"
        assert settings.haiku_model == "mlx-community/Qwen3-4B-4bit"

    def test_new_fields_from_dict_backward_compat(self):
        """Test from_dict({}) gives correct defaults — simulates old settings.json."""
        settings = ClaudeCodeSettings.from_dict({})
        assert settings.mode == "cloud"
        assert settings.opus_model is None
        assert settings.sonnet_model is None
        assert settings.haiku_model is None

    def test_new_fields_from_dict_null_model(self):
        """Test from_dict with explicit null model values."""
        data = {"mode": "cloud", "opus_model": None}
        settings = ClaudeCodeSettings.from_dict(data)
        assert settings.mode == "cloud"
        assert settings.opus_model is None


class TestIntegrationSettings:
    """Tests for IntegrationSettings dataclass.

    Upstream ``tests/test_integrations.py::TestIntegrationSettings`` already
    covers defaults, basic to_dict, and full/empty from_dict. The local
    tests below add: exact dict-shape pinning (so a future field
    addition that forgets to_dict raises a loud test failure — see
    81dc2d5 for the MemorySettings case), partial-dict fallback,
    explicit-null override semantics, and round-trip identity. Plus
    upstream's MarkItDown-integration tests merged in below.
    """

    def test_to_dict_defaults(self):
        settings = IntegrationSettings()
        d = settings.to_dict()
        # Pin only the integration-model surface — MarkItDown additions
        # are covered by ``test_markitdown_defaults`` separately, so we
        # check the model fields exactly and leave the rest free to
        # grow.
        assert d["codex_model"] is None
        assert d["opencode_model"] is None
        assert d["openclaw_model"] is None
        assert d["hermes_model"] is None
        assert d["pi_model"] is None
        assert d["copilot_model"] is None
        assert d["openclaw_tools_profile"] == "coding"

    def test_to_dict_custom(self):
        settings = IntegrationSettings(
            codex_model="qwen-coder-30b",
            opencode_model="qwen-coder-7b",
            openclaw_model="qwen-coder-3b",
            hermes_model="hermes-3-8b",
            pi_model="qwen-3-4b",
            copilot_model="qwen-coder-1.5b",
            openclaw_tools_profile="creative",
        )
        d = settings.to_dict()
        assert d["codex_model"] == "qwen-coder-30b"
        assert d["opencode_model"] == "qwen-coder-7b"
        assert d["openclaw_model"] == "qwen-coder-3b"
        assert d["hermes_model"] == "hermes-3-8b"
        assert d["pi_model"] == "qwen-3-4b"
        assert d["copilot_model"] == "qwen-coder-1.5b"
        assert d["openclaw_tools_profile"] == "creative"

    def test_from_dict_partial(self):
        """Missing keys fall back to dataclass defaults."""
        settings = IntegrationSettings.from_dict({"pi_model": "qwen-3-4b"})
        assert settings.pi_model == "qwen-3-4b"
        assert settings.codex_model is None
        assert settings.copilot_model is None
        assert settings.openclaw_tools_profile == "coding"

    def test_from_dict_explicit_null_overrides_default(self):
        """Explicit None for a *_model field must be preserved."""
        settings = IntegrationSettings.from_dict({"codex_model": None, "pi_model": "x"})
        assert settings.codex_model is None
        assert settings.pi_model == "x"

    def test_round_trip(self):
        """to_dict → from_dict → to_dict is identity."""
        original = IntegrationSettings(
            codex_model="m1",
            pi_model="m2",
            openclaw_tools_profile="custom",
        )
        round_tripped = IntegrationSettings.from_dict(original.to_dict())
        assert round_tripped.to_dict() == original.to_dict()

    # --- MarkItDown integration tests merged in from upstream ---

    def test_markitdown_defaults(self):
        settings = IntegrationSettings()
        assert settings.markitdown_enabled is True
        assert settings.markitdown_expose_model is False
        assert settings.markitdown_max_file_size_mb == 25
        assert settings.markitdown_max_files_per_request == 5
        assert settings.markitdown_pdf_processing_engine == "markitdown"

    def test_markitdown_to_dict(self):
        settings = IntegrationSettings(
            markitdown_enabled=False,
            markitdown_expose_model=False,
            markitdown_max_file_size_mb=10,
            markitdown_max_files_per_request=2,
            markitdown_pdf_processing_engine="OCR-Model",
        )
        result = settings.to_dict()
        assert result["markitdown_enabled"] is False
        assert result["markitdown_expose_model"] is False
        assert result["markitdown_max_file_size_mb"] == 10
        assert result["markitdown_max_files_per_request"] == 2
        assert result["markitdown_pdf_processing_engine"] == "OCR-Model"

    def test_markitdown_from_dict_backward_compat(self):
        settings = IntegrationSettings.from_dict({})
        assert settings.markitdown_enabled is True
        assert settings.markitdown_expose_model is False
        assert settings.markitdown_max_file_size_mb == 25
        assert settings.markitdown_max_files_per_request == 5
        assert settings.markitdown_pdf_processing_engine == "markitdown"

    def test_markitdown_validation(self):
        settings = GlobalSettings()
        settings.integrations.markitdown_max_file_size_mb = 0
        settings.integrations.markitdown_max_files_per_request = 0
        settings.integrations.markitdown_pdf_processing_engine = ""
        errors = settings.validate()
        assert "markitdown_max_file_size_mb must be > 0" in errors
        assert "markitdown_max_files_per_request must be > 0" in errors
        assert "markitdown_pdf_processing_engine must not be empty" in errors


class TestClaudeCodeValidation:
    """Tests for mode validation in GlobalSettings.validate()."""

    def _make_global_settings(self, mode: str) -> GlobalSettings:
        """Create a GlobalSettings with a specific claude_code.mode for testing."""
        gs = GlobalSettings.__new__(GlobalSettings)
        # Copy defaults from a real instance then override claude_code
        real = GlobalSettings()
        gs.__dict__.update(real.__dict__)
        gs.claude_code = ClaudeCodeSettings(mode=mode)
        return gs

    def test_validate_mode_cloud_valid(self):
        """Mode 'cloud' passes validation."""
        gs = self._make_global_settings("cloud")
        errors = gs.validate()
        mode_errors = [e for e in errors if "claude_code mode" in e]
        assert mode_errors == []

    def test_validate_mode_local_valid(self):
        """Mode 'local' passes validation."""
        gs = self._make_global_settings("local")
        errors = gs.validate()
        mode_errors = [e for e in errors if "claude_code mode" in e]
        assert mode_errors == []

    def test_validate_mode_invalid(self):
        """Invalid mode produces a validation error."""
        gs = self._make_global_settings("auto")
        errors = gs.validate()
        mode_errors = [e for e in errors if "claude_code mode" in e]
        assert len(mode_errors) == 1
        assert "auto" in mode_errors[0]

    def test_validate_mode_empty_string_invalid(self):
        """Empty string mode is invalid."""
        gs = self._make_global_settings("")
        errors = gs.validate()
        mode_errors = [e for e in errors if "claude_code mode" in e]
        assert len(mode_errors) == 1


class TestClaudeCodeRouteIntegration:
    """Integration tests for the settings chain: dataclass <-> dict <-> routes."""

    def test_claude_code_to_dict_has_six_keys(self):
        """to_dict must include all six keys so GlobalSettings.save() persists them."""
        s = ClaudeCodeSettings(
            context_scaling_enabled=True,
            target_context_size=100000,
            mode="local",
            opus_model="mlx-community/Qwen3-30B-A3B-4bit",
            sonnet_model="mlx-community/Qwen3-14B-4bit",
            haiku_model="mlx-community/Qwen3-4B-4bit",
        )
        d = s.to_dict()
        expected_keys = {
            "context_scaling_enabled",
            "target_context_size",
            "mode",
            "opus_model",
            "sonnet_model",
            "haiku_model",
        }
        assert set(d.keys()) == expected_keys

    def test_claude_code_new_fields_round_trip(self):
        """Full round-trip: set values -> to_dict -> from_dict -> values match."""
        original = ClaudeCodeSettings(
            mode="local",
            opus_model="mlx-community/Qwen3-30B-A3B-4bit",
            sonnet_model="mlx-community/Qwen3-14B-4bit",
            haiku_model="mlx-community/Qwen3-4B-4bit",
        )
        reloaded = ClaudeCodeSettings.from_dict(original.to_dict())
        assert reloaded.mode == "local"
        assert reloaded.opus_model == "mlx-community/Qwen3-30B-A3B-4bit"
        assert reloaded.sonnet_model == "mlx-community/Qwen3-14B-4bit"
        assert reloaded.haiku_model == "mlx-community/Qwen3-4B-4bit"

    def test_claude_code_round_trip_null_models(self):
        """Null model fields survive the round-trip."""
        original = ClaudeCodeSettings(mode="cloud", opus_model=None)
        reloaded = ClaudeCodeSettings.from_dict(original.to_dict())
        assert reloaded.mode == "cloud"
        assert reloaded.opus_model is None

    def test_post_handler_model_fields_set_explicit_null(self):
        """
        GlobalSettingsRequest.model_validate with explicit null must include
        the field in model_fields_set so the POST handler can clear it.
        """
        from omlx.admin.routes import GlobalSettingsRequest

        r = GlobalSettingsRequest.model_validate({"claude_code_opus_model": None})
        assert "claude_code_opus_model" in r.model_fields_set
        assert r.claude_code_opus_model is None

    def test_post_handler_model_fields_set_absent_field(self):
        """
        GlobalSettingsRequest() with no claude_code_opus_model must NOT include it
        in model_fields_set — POST handler must not apply it (leave server value alone).
        """
        from omlx.admin.routes import GlobalSettingsRequest

        r = GlobalSettingsRequest()
        assert "claude_code_opus_model" not in r.model_fields_set

    def test_post_handler_model_fields_set_explicit_value(self):
        """
        GlobalSettingsRequest with an explicit model ID must include the field
        in model_fields_set and carry the value.
        """
        from omlx.admin.routes import GlobalSettingsRequest

        r = GlobalSettingsRequest(
            claude_code_opus_model="mlx-community/Qwen3-30B-A3B-4bit"
        )
        assert "claude_code_opus_model" in r.model_fields_set
        assert r.claude_code_opus_model == "mlx-community/Qwen3-30B-A3B-4bit"


class TestCORSMiddleware:
    """Test that CORS middleware is correctly applied to the server."""

    def test_cors_preflight(self):
        """Test that CORS preflight requests get proper response headers."""
        from fastapi.testclient import TestClient

        from omlx.server import app, init_server

        # Reset middleware stack so add_middleware works even if app was
        # already started by another test in the same process.
        app.middleware_stack = None

        with tempfile.TemporaryDirectory() as tmpdir:
            settings = GlobalSettings(base_path=Path(tmpdir))
            init_server(
                model_dirs=[tmpdir],
                global_settings=settings,
            )

            client = TestClient(app)
            resp = client.options(
                "/v1/models",
                headers={
                    "Origin": "https://example.com",
                    "Access-Control-Request-Method": "GET",
                },
            )
            assert resp.status_code == 200
            assert "access-control-allow-origin" in resp.headers
            assert resp.headers["access-control-allow-origin"] == "*"