"""Tests for AgentLoop integration with AgentRunner: streaming, think-filter, error handling, subagent."""

from __future__ import annotations

import time
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from nanobot.agent.goal_permission import goal_mutation_allowed, goal_mutation_permission
from nanobot.bus.outbound_events import StreamedResponseEvent
from nanobot.config.schema import AgentDefaults
from nanobot.providers.base import GenerationSettings, LLMProvider, LLMResponse, ToolCallRequest
from nanobot.runtime_context import RuntimeContextBlock, public_history_message
from nanobot.session.goal_state import GOAL_STATE_KEY
from nanobot.utils.llm_runtime import LLMRuntime

_MAX_TOOL_RESULT_CHARS = AgentDefaults().max_tool_result_chars
_GOAL_RUNTIME_GUIDANCE_TAG = "[Goal Runtime Guidance — host instructions]"


def _make_loop(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.queue import MessageBus

    bus = MessageBus()
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.generation = GenerationSettings()

    with patch("nanobot.agent.loop.ContextBuilder"), \
         patch("nanobot.agent.loop.SessionManager"), \
         patch("nanobot.agent.loop.SubagentManager") as mock_sub_mgr:
        mock_sub_mgr.return_value.cancel_by_session = AsyncMock(return_value=0)
        loop = AgentLoop(bus=bus, provider=provider, workspace=tmp_path)
    return loop


@pytest.mark.asyncio
async def test_ephemeral_runner_enters_and_restores_turn_scopes(tmp_path):
    loop = _make_loop(tmp_path)

    async def chat_with_retry(**_kwargs):
        assert goal_mutation_allowed() is True
        return LLMResponse(content="done", tool_calls=[], usage={})

    loop.provider.chat_with_retry = AsyncMock(side_effect=chat_with_retry)
    loop.tools.get_definitions = MagicMock(return_value=[])

    await loop._run_agent_loop(
        [],
        runtime=loop.llm_runtime(),
        ephemeral=True,
        turn_scopes=[goal_mutation_permission(True)],
    )

    assert goal_mutation_allowed() is False


@pytest.mark.asyncio
async def test_goal_command_can_implement_plan_from_prior_discussion(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.chat_with_retry = AsyncMock(side_effect=[
        LLMResponse(
            content="recording the agreed plan",
            tool_calls=[
                ToolCallRequest(
                    id="call_create",
                    name="create_goal",
                    arguments={
                        "objective": "Implement the agreed migration plan and run its tests.",
                    },
                )
            ],
            usage={},
        ),
        LLMResponse(
            content="closing goal",
            tool_calls=[
                ToolCallRequest(
                    id="call_update",
                    name="update_goal",
                    arguments={"action": "complete", "recap": "Implemented and tested."},
                )
            ],
            usage={},
        ),
        LLMResponse(
            content="trying to start another goal",
            tool_calls=[
                ToolCallRequest(
                    id="call_create_again",
                    name="create_goal",
                    arguments={"objective": "Start an unrelated follow-up."},
                )
            ],
            usage={},
        ),
        LLMResponse(content="done", tool_calls=[], usage={}),
    ])
    loop = AgentLoop(bus=MessageBus(), provider=provider, workspace=tmp_path, model="test-model")
    loop.consolidator.maybe_consolidate_by_tokens = AsyncMock(return_value=None)
    session = loop.sessions.get_or_create("cli:direct")
    session.add_message("user", "Let's agree on the migration implementation.")
    session.add_message("assistant", "Use the staged migration plan and run integration tests.")

    result = await loop._process_message(
        InboundMessage(
            channel="cli",
            sender_id="user",
            chat_id="direct",
            content="/goal implement the plan above",
        )
    )

    assert result is not None
    assert result.content == "done"
    assert goal_mutation_allowed() is False
    assert session.metadata[GOAL_STATE_KEY]["status"] == "completed"
    first_request = provider.chat_with_retry.await_args_list[0].kwargs["messages"]
    assert "staged migration plan" in str(first_request)
    assert "/goal implement the plan above" in str(first_request)
    assert _GOAL_RUNTIME_GUIDANCE_TAG in str(first_request)
    final_request = provider.chat_with_retry.await_args_list[-1].kwargs["messages"]
    assert "create_goal is unavailable for this turn" in str(final_request)
    assert _GOAL_RUNTIME_GUIDANCE_TAG in str(session.messages[2]["content"])
    assert _GOAL_RUNTIME_GUIDANCE_TAG not in str(
        public_history_message(session.messages[2])["content"]
    )


@pytest.mark.asyncio
async def test_runtime_context_is_persisted_as_next_turn_prompt_prefix(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.generation = GenerationSettings()
    provider.chat_with_retry = AsyncMock(side_effect=[
        LLMResponse(content="first answer", usage={}),
        LLMResponse(content="second answer", usage={}),
    ])
    loop = AgentLoop(bus=MessageBus(), provider=provider, workspace=tmp_path, model="test-model")
    loop.consolidator.maybe_consolidate_by_tokens = AsyncMock(return_value=None)
    session = loop.sessions.get_or_create("cli:direct")
    provider_calls: list[str | None] = []

    async def provide_context(request):
        provider_calls.append(request.turn_id)
        return RuntimeContextBlock(source="test", content="stable provider context")

    loop.register_runtime_context_provider(provide_context)
    loop.register_runtime_context_provider(provide_context)

    await loop._process_message(InboundMessage(
        channel="cli",
        sender_id="user",
        chat_id="direct",
        content="first turn",
    ))
    await loop._process_message(InboundMessage(
        channel="cli",
        sender_id="user",
        chat_id="direct",
        content="second turn",
    ))

    first_request = provider.chat_with_retry.await_args_list[0].kwargs["messages"]
    second_request = provider.chat_with_retry.await_args_list[1].kwargs["messages"]
    first_wire = LLMProvider._sanitize_empty_content(first_request)
    second_wire = LLMProvider._sanitize_empty_content(second_request)
    assert second_wire[: len(first_wire)] == first_wire
    assert first_wire[1] == second_wire[1]
    assert second_wire[2]["role"] == "assistant"
    assert second_wire[2]["content"] == "first answer"
    assert second_wire[3]["content"].startswith("second turn")
    assert len(provider_calls) == 2

    persisted_first_user = session.messages[0]
    assert persisted_first_user["content"] == first_wire[1]["content"]
    assert public_history_message(persisted_first_user)["content"] == "first turn"


@pytest.mark.asyncio
async def test_runtime_context_provider_runs_once_across_tool_iterations(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    (tmp_path / "note.txt").write_text("hello", encoding="utf-8")
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.generation = GenerationSettings()
    provider.chat_with_retry = AsyncMock(side_effect=[
        LLMResponse(
            content="reading",
            tool_calls=[ToolCallRequest(
                id="call_read",
                name="read_file",
                arguments={"path": "note.txt"},
            )],
            usage={},
        ),
        LLMResponse(content="done", usage={}),
    ])
    loop = AgentLoop(bus=MessageBus(), provider=provider, workspace=tmp_path, model="test-model")
    loop.consolidator.maybe_consolidate_by_tokens = AsyncMock(return_value=None)
    provider_calls = 0

    async def provide_context(_request):
        nonlocal provider_calls
        provider_calls += 1
        return RuntimeContextBlock(source="test", content="frozen context")

    loop.register_runtime_context_provider(provide_context)

    await loop._process_message(InboundMessage(
        channel="cli",
        sender_id="user",
        chat_id="direct",
        content="read the note",
    ))

    assert provider.chat_with_retry.await_count == 2
    assert provider_calls == 1
    for call in provider.chat_with_retry.await_args_list:
        assert "frozen context" in str(call.kwargs["messages"])


@pytest.mark.asyncio
async def test_non_goal_direct_turn_cannot_reuse_prior_goal_command(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.queue import MessageBus

    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.chat_with_retry = AsyncMock(side_effect=[
        LLMResponse(
            content="trying to create a goal",
            tool_calls=[
                ToolCallRequest(
                    id="call_create",
                    name="create_goal",
                    arguments={"objective": "Unauthorized persistent objective."},
                )
            ],
            usage={},
        ),
        LLMResponse(content="handled as a one-time task", tool_calls=[], usage={}),
    ])
    loop = AgentLoop(bus=MessageBus(), provider=provider, workspace=tmp_path, model="test-model")
    loop.consolidator.maybe_consolidate_by_tokens = AsyncMock(return_value=None)
    session = loop.sessions.get_or_create("api:default")
    session.add_message("user", "/goal old completed request")
    session.add_message("assistant", "The old request is complete.")

    result = await loop.process_direct(
        "Handle this as an ordinary one-time task.",
        session_key=session.key,
        channel="api",
        chat_id="default",
        persist_user_message=False,
    )

    assert result is not None
    assert result.content == "handled as a one-time task"
    assert GOAL_STATE_KEY not in session.metadata
    second_request = provider.chat_with_retry.await_args_list[1].kwargs["messages"]
    assert "create_goal is unavailable for this turn" in str(second_request)

@pytest.mark.asyncio
async def test_loop_max_iterations_message_stays_stable(tmp_path):
    loop = _make_loop(tmp_path)
    loop.provider.chat_with_retry = AsyncMock(return_value=LLMResponse(
        content="working",
        tool_calls=[ToolCallRequest(id="call_1", name="list_dir", arguments={})],
    ))
    loop.tools.get_definitions = MagicMock(return_value=[])
    loop.tools.execute = AsyncMock(return_value="ok")
    loop.max_iterations = 2

    final_content, _, _, _, _ = await loop._run_agent_loop(
        [], runtime=loop.llm_runtime()
    )

    assert final_content == (
        "I reached the maximum number of tool call iterations (2) "
        "without completing the task. You can try breaking the task into smaller steps."
    )


@pytest.mark.asyncio
async def test_loop_goal_turn_uses_standard_iteration_budget(tmp_path):
    loop = _make_loop(tmp_path)
    loop.provider.chat_with_retry = AsyncMock(return_value=LLMResponse(
        content="working",
        tool_calls=[ToolCallRequest(id="call_1", name="list_dir", arguments={})],
    ))
    loop.tools.get_definitions = MagicMock(return_value=[])
    loop.tools.execute = AsyncMock(return_value="ok")
    loop.max_iterations = 2

    final_content, _, _, stop_reason, _ = await loop._run_agent_loop(
        [],
        runtime=loop.llm_runtime(),
        metadata={"original_command": "/goal"},
    )

    assert stop_reason == "max_iterations"
    assert loop.provider.chat_with_retry.await_count == 3
    assert loop.provider.chat_with_retry.await_args_list[-1].kwargs["tools"] is None
    assert final_content == (
        "I reached the maximum number of tool call iterations (2) "
        "without completing the task. You can try breaking the task into smaller steps."
    )


@pytest.mark.asyncio
async def test_loop_stream_filter_handles_think_only_prefix_without_crashing(tmp_path):
    loop = _make_loop(tmp_path)
    deltas: list[str] = []
    endings: list[bool] = []

    async def chat_stream_with_retry(*, on_content_delta, **kwargs):
        await on_content_delta("<think>hidden")
        await on_content_delta("</think>Hello")
        return LLMResponse(content="<think>hidden</think>Hello", tool_calls=[], usage={})

    loop.provider.chat_stream_with_retry = chat_stream_with_retry

    async def on_stream(delta: str) -> None:
        deltas.append(delta)

    async def on_stream_end(*, resuming: bool = False) -> None:
        endings.append(resuming)

    final_content, _, _, _, _ = await loop._run_agent_loop(
        [],
        runtime=loop.llm_runtime(),
        on_stream=on_stream,
        on_stream_end=on_stream_end,
    )

    assert final_content == "Hello"
    assert deltas == ["Hello"]
    assert endings == [False]


@pytest.mark.asyncio
async def test_loop_stream_filter_hides_partial_trailing_think_prefix(tmp_path):
    loop = _make_loop(tmp_path)
    deltas: list[str] = []

    async def chat_stream_with_retry(*, on_content_delta, **kwargs):
        await on_content_delta("Hello <thin")
        await on_content_delta("k>hidden</think>World")
        return LLMResponse(content="Hello <think>hidden</think>World", tool_calls=[], usage={})

    loop.provider.chat_stream_with_retry = chat_stream_with_retry

    async def on_stream(delta: str) -> None:
        deltas.append(delta)

    final_content, _, _, _, _ = await loop._run_agent_loop(
        [], runtime=loop.llm_runtime(), on_stream=on_stream
    )

    assert final_content == "Hello World"
    assert deltas == ["Hello", " World"]


@pytest.mark.asyncio
async def test_loop_stream_filter_hides_complete_trailing_think_tag(tmp_path):
    loop = _make_loop(tmp_path)
    deltas: list[str] = []

    async def chat_stream_with_retry(*, on_content_delta, **kwargs):
        await on_content_delta("Hello <think>")
        await on_content_delta("hidden</think>World")
        return LLMResponse(content="Hello <think>hidden</think>World", tool_calls=[], usage={})

    loop.provider.chat_stream_with_retry = chat_stream_with_retry

    async def on_stream(delta: str) -> None:
        deltas.append(delta)

    final_content, _, _, _, _ = await loop._run_agent_loop(
        [], runtime=loop.llm_runtime(), on_stream=on_stream
    )

    assert final_content == "Hello World"
    assert deltas == ["Hello", " World"]


@pytest.mark.asyncio
async def test_loop_retries_think_only_final_response(tmp_path):
    loop = _make_loop(tmp_path)
    call_count = {"n": 0}

    async def chat_with_retry(**kwargs):
        call_count["n"] += 1
        if call_count["n"] == 1:
            return LLMResponse(content="<think>hidden</think>", tool_calls=[], usage={})
        return LLMResponse(content="Recovered answer", tool_calls=[], usage={})

    loop.provider.chat_with_retry = chat_with_retry

    final_content, _, _, _, _ = await loop._run_agent_loop(
        [], runtime=loop.llm_runtime()
    )

    assert final_content == "Recovered answer"
    assert call_count["n"] == 2


@pytest.mark.asyncio
async def test_streamed_flag_not_set_on_llm_error(tmp_path):
    """When LLM errors during a streaming-capable channel interaction,
    _streamed must NOT be set so ChannelManager delivers the error."""
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    bus = MessageBus()
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    loop = AgentLoop(bus=bus, provider=provider, workspace=tmp_path, model="test-model")
    error_resp = LLMResponse(
        content="503 service unavailable", finish_reason="error", tool_calls=[], usage={},
    )
    loop.provider.chat_with_retry = AsyncMock(return_value=error_resp)
    loop.provider.chat_stream_with_retry = AsyncMock(return_value=error_resp)
    loop.tools.get_definitions = MagicMock(return_value=[])

    msg = InboundMessage(
        channel="feishu", sender_id="u1", chat_id="c1", content="hi",
    )
    result = await loop._process_message(
        msg,
        on_stream=AsyncMock(),
        on_stream_end=AsyncMock(),
    )

    assert result is not None
    assert "503" in result.content
    assert not isinstance(result.event, StreamedResponseEvent), (
        "streamed response event must not be set when stop_reason is error"
    )


@pytest.mark.asyncio
async def test_ssrf_soft_block_can_finalize_after_streamed_tool_call(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    bus = MessageBus()
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    tool_call_resp = LLMResponse(
        content="checking metadata",
        tool_calls=[ToolCallRequest(
            id="call_ssrf",
            name="exec",
            arguments={"command": "curl http://169.254.169.254/latest/meta-data/"},
        )],
        usage={},
    )
    provider.chat_stream_with_retry = AsyncMock(side_effect=[
        tool_call_resp,
        LLMResponse(
            content="I cannot access private URLs. Please share the local file.",
            tool_calls=[],
            usage={},
        ),
    ])

    loop = AgentLoop(bus=bus, provider=provider, workspace=tmp_path, model="test-model")
    loop.tools.get_definitions = MagicMock(return_value=[])
    loop.tools.prepare_call = MagicMock(return_value=(None, {}, None))
    loop.tools.execute = AsyncMock(return_value=(
        "Error: Command blocked by safety guard (internal/private URL detected)"
    ))

    result = await loop._process_message(
        InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="hi"),
        on_stream=AsyncMock(),
        on_stream_end=AsyncMock(),
    )

    assert result is not None
    assert result.content == "I cannot access private URLs. Please share the local file."
    assert isinstance(result.event, StreamedResponseEvent)


@pytest.mark.asyncio
async def test_next_turn_after_llm_error_keeps_turn_boundary(tmp_path):
    from nanobot.agent.loop import AgentLoop
    from nanobot.agent.runner import _PERSISTED_MODEL_ERROR_PLACEHOLDER
    from nanobot.bus.events import InboundMessage
    from nanobot.bus.queue import MessageBus

    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.chat_with_retry = AsyncMock(side_effect=[
        LLMResponse(content="429 rate limit exceeded", finish_reason="error", tool_calls=[], usage={}),
        LLMResponse(content="Recovered answer", tool_calls=[], usage={}),
    ])

    loop = AgentLoop(bus=MessageBus(), provider=provider, workspace=tmp_path, model="test-model")
    loop.tools.get_definitions = MagicMock(return_value=[])
    loop.consolidator.maybe_consolidate_by_tokens = AsyncMock(return_value=False)  # type: ignore[method-assign]

    first = await loop._process_message(
        InboundMessage(channel="cli", sender_id="user", chat_id="test", content="first question")
    )
    assert first is not None
    assert first.content == "429 rate limit exceeded"

    session = loop.sessions.get_or_create("cli:test")
    assert [
        {key: value for key, value in message.items() if key in {"role", "content"}}
        for message in session.messages
    ] == [
        {"role": "user", "content": "first question"},
        {"role": "assistant", "content": _PERSISTED_MODEL_ERROR_PLACEHOLDER},
    ]

    second = await loop._process_message(
        InboundMessage(channel="cli", sender_id="user", chat_id="test", content="second question")
    )
    assert second is not None
    assert second.content == "Recovered answer"

    request_messages = provider.chat_with_retry.await_args_list[1].kwargs["messages"]
    non_system = [message for message in request_messages if message.get("role") != "system"]
    assert non_system[0]["role"] == "user"
    assert "first question" in non_system[0]["content"]
    assert non_system[1]["role"] == "assistant"
    assert _PERSISTED_MODEL_ERROR_PLACEHOLDER in non_system[1]["content"]
    assert non_system[2]["role"] == "user"
    assert "second question" in non_system[2]["content"]


@pytest.mark.asyncio
async def test_subagent_max_iterations_announces_existing_fallback(tmp_path, monkeypatch):
    from nanobot.agent.subagent import SubagentManager, SubagentStatus
    from nanobot.bus.queue import MessageBus

    bus = MessageBus()
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    provider.chat_with_retry = AsyncMock(return_value=LLMResponse(
        content="working",
        tool_calls=[ToolCallRequest(id="call_1", name="list_dir", arguments={"path": "."})],
    ))
    mgr = SubagentManager(
        workspace=tmp_path,
        bus=bus,
        max_tool_result_chars=_MAX_TOOL_RESULT_CHARS,
    )
    mgr._announce_result = AsyncMock()

    async def fake_execute(self, **kwargs):
        return "tool result"

    monkeypatch.setattr("nanobot.agent.tools.filesystem.ListDirTool.execute", fake_execute)

    status = SubagentStatus(task_id="sub-1", label="label", task_description="do task", started_at=time.monotonic())
    await mgr._run_subagent(
        "sub-1",
        "do task",
        "label",
        {"channel": "test", "chat_id": "c1"},
        status,
        LLMRuntime.capture(provider, "test-model", context_window_tokens=128_000),
    )

    mgr._announce_result.assert_awaited_once()
    args = mgr._announce_result.await_args.args
    assert args[3] == "Task completed but no final response was generated."
    assert args[5] == "ok"