"""Unit tests for utils.log_paths.resolve_log_dir."""

from __future__ import annotations

import os

import pytest

from utils.log_paths import resolve_log_dir


class TestEnvOverride:
    def test_override_wins_on_macos(self):
        path = resolve_log_dir(
            platform="darwin",
            env={"UNITY_MCP_LOG_DIR": "/tmp/custom-logs"},
        )
        assert path == "/tmp/custom-logs"

    def test_override_wins_on_windows(self):
        path = resolve_log_dir(
            platform="win32",
            env={"UNITY_MCP_LOG_DIR": "/tmp/custom-logs", "LOCALAPPDATA": r"C:\ignored"},
        )
        assert path == "/tmp/custom-logs"

    def test_override_wins_on_linux(self):
        path = resolve_log_dir(
            platform="linux",
            env={"UNITY_MCP_LOG_DIR": "/tmp/custom-logs", "XDG_STATE_HOME": "/ignored"},
        )
        assert path == "/tmp/custom-logs"

    def test_override_expands_user(self):
        path = resolve_log_dir(
            platform="linux",
            env={"UNITY_MCP_LOG_DIR": "~/my-logs"},
        )
        assert path == os.path.expanduser("~/my-logs")
        assert "~" not in path


def _norm(p: str) -> str:
    """Normalize for cross-host comparison: os.path.expanduser can leave
    mixed separators when a foreign platform is injected during testing."""
    return os.path.normpath(p)


class TestPlatformDefaults:
    def test_macos_uses_application_support(self):
        path = resolve_log_dir(platform="darwin", env={})
        assert _norm(path).endswith(_norm(
            "Library/Application Support/UnityMCP/Logs"))
        assert "~" not in path

    def test_windows_uses_localappdata_env(self):
        path = resolve_log_dir(
            platform="win32",
            env={"LOCALAPPDATA": r"C:\Users\alice\AppData\Local"},
        )
        assert _norm(path) == _norm(os.path.join(
            r"C:\Users\alice\AppData\Local", "UnityMCP", "Logs"))

    def test_windows_falls_back_when_localappdata_missing(self):
        path = resolve_log_dir(platform="win32", env={})
        # Fallback expands ~/AppData/Local; assert shape, not the exact user home.
        assert _norm(path).endswith(_norm("AppData/Local/UnityMCP/Logs"))
        assert "~" not in path

    def test_linux_uses_xdg_state_home(self):
        path = resolve_log_dir(
            platform="linux",
            env={"XDG_STATE_HOME": "/home/alice/.local/state"},
        )
        assert _norm(path) == _norm(os.path.join(
            "/home/alice/.local/state", "UnityMCP", "Logs"))

    def test_linux_falls_back_to_default_xdg_path(self):
        path = resolve_log_dir(platform="linux", env={})
        assert _norm(path).endswith(_norm(".local/state/UnityMCP/Logs"))
        assert "~" not in path

    @pytest.mark.parametrize("unix_like", ["freebsd", "openbsd", "sunos5"])
    def test_unknown_unix_variants_follow_linux_branch(self, unix_like):
        path = resolve_log_dir(
            platform=unix_like,
            env={"XDG_STATE_HOME": "/var/state"},
        )
        assert _norm(path) == _norm(os.path.join(
            "/var/state", "UnityMCP", "Logs"))


class TestDefaults:
    def test_no_args_reads_live_environment(self, monkeypatch):
        """With no args, should read sys.platform and os.environ directly."""
        monkeypatch.setenv("UNITY_MCP_LOG_DIR", "/tmp/live-env-test")
        assert resolve_log_dir() == "/tmp/live-env-test"