"""Tests for PositionArtifactCapMiddleware."""

from __future__ import annotations

from types import SimpleNamespace

from langchain_core.messages import AIMessage, HumanMessage, ToolMessage

from deerflow.agents.middlewares.position_artifact_cap_middleware import (
    PositionArtifactCapMiddleware,
    _reminder_for,
    _successful_outputs_writes,
    _successful_presents,
)


def _runtime(cap: int | None = 1) -> SimpleNamespace:
    context: dict = {"thread_id": "t-pos"}
    if cap is not None:
        context["position_artifact_cap"] = cap
    return SimpleNamespace(context=context, config={"configurable": dict(context)})


def _write_call(call_id: str, path: str = "/mnt/user-data/outputs/report.md") -> dict:
    return {
        "id": call_id,
        "name": "write_file",
        "args": {"path": path, "content": "# hello", "description": "deliver"},
    }


def _present_call(call_id: str, path: str = "/mnt/user-data/outputs/report.md") -> dict:
    return {
        "id": call_id,
        "name": "present_files",
        "args": {"filepaths": [path]},
    }


def test_successful_outputs_writes_counts_ok_in_current_turn_only() -> None:
    messages = [
        HumanMessage(content="上一轮"),
        AIMessage(content="", tool_calls=[_write_call("old")]),
        ToolMessage(content="OK", tool_call_id="old", name="write_file"),
        HumanMessage(content="本轮请交付"),
        AIMessage(content="", tool_calls=[_write_call("new")]),
        ToolMessage(content="OK", tool_call_id="new", name="write_file"),
    ]
    assert _successful_outputs_writes(messages, turn_start=3) == 1


def test_after_model_truncates_second_outputs_write_in_same_response() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付一份报告"),
            AIMessage(
                content="正在写入",
                tool_calls=[
                    _write_call("w1"),
                    _write_call("w2", "/mnt/user-data/outputs/report-copy.md"),
                    _present_call("p1"),
                ],
            ),
        ]
    }
    update = mw.after_model(state, _runtime(1))
    assert update is not None
    tool_calls = update["messages"][0].tool_calls
    assert [tc["id"] for tc in tool_calls] == ["w1", "p1"]


def test_after_model_strips_all_writes_once_cap_already_met() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(content="", tool_calls=[_write_call("done")]),
            ToolMessage(content="OK", tool_call_id="done", name="write_file"),
            AIMessage(content="再写一份", tool_calls=[_write_call("again")]),
        ]
    }
    update = mw.after_model(state, _runtime(1))
    assert update is not None
    assert update["messages"][0].tool_calls == []
    assert update.get("jump_to") == "end"
    assert "产物上限" not in str(update["messages"][0].content)
    assert "tool_calls" not in (update["messages"][0].additional_kwargs or {})


def test_after_model_noop_without_cap() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(content="", tool_calls=[_write_call("w1"), _write_call("w2")]),
        ]
    }
    assert mw.after_model(state, _runtime(None)) is None


def test_wrap_tool_call_rejects_after_successful_delivery() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(content="", tool_calls=[_write_call("done")]),
            ToolMessage(content="OK", tool_call_id="done", name="write_file"),
        ]
    }
    request = SimpleNamespace(
        tool_call=_write_call("again"),
        runtime=_runtime(1),
        state=state,
    )
    called = {"n": 0}

    def handler(_request):
        called["n"] += 1
        return ToolMessage(content="OK", tool_call_id="again", name="write_file")

    result = mw.wrap_tool_call(request, handler)
    assert called["n"] == 0
    assert isinstance(result, ToolMessage)
    assert str(result.content).startswith("Error:")


def test_wrap_tool_call_allows_first_write() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {"messages": [HumanMessage(content="请交付")]}
    request = SimpleNamespace(
        tool_call=_write_call("w1"),
        runtime=_runtime(1),
        state=state,
    )

    def handler(_request):
        return ToolMessage(content="OK", tool_call_id="w1", name="write_file")

    result = mw.wrap_tool_call(request, handler)
    assert result.content == "OK"


def test_wrap_tool_call_rejects_parallel_second_write_in_same_batch() -> None:
    """Two write_file in one AIMessage can run concurrently; order in the list is the budget."""
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(content="", tool_calls=[_write_call("w1"), _write_call("w2")]),
        ]
    }
    first = SimpleNamespace(tool_call=_write_call("w1"), runtime=_runtime(1), state=state)
    second = SimpleNamespace(tool_call=_write_call("w2"), runtime=_runtime(1), state=state)

    def handler(request):
        return ToolMessage(content="OK", tool_call_id=request.tool_call["id"], name="write_file")

    assert mw.wrap_tool_call(first, handler).content == "OK"
    rejected = mw.wrap_tool_call(second, handler)
    assert str(rejected.content).startswith("Error:")


def test_after_model_clears_provider_tool_call_metadata() -> None:
    mw = PositionArtifactCapMiddleware()
    extra = {
        "tool_calls": [
            {"id": "w1", "type": "function", "function": {"name": "write_file"}},
            {"id": "w2", "type": "function", "function": {"name": "write_file"}},
        ]
    }
    ai = AIMessage(content="写两份", tool_calls=[_write_call("w1"), _write_call("w2")])
    ai.additional_kwargs = extra
    state = {"messages": [HumanMessage(content="请交付"), ai]}
    update = mw.after_model(state, _runtime(1))
    assert update is not None
    kept = update["messages"][0]
    assert [tc["id"] for tc in kept.tool_calls] == ["w1"]
    assert [item["id"] for item in kept.additional_kwargs.get("tool_calls", [])] == ["w1"]


def test_action_plan_style_cap_two_allows_second_write() -> None:
    """Action-plan is exempt in the UI (no flag); if a cap of 2 were set it must allow both."""
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="生成行动规划"),
            AIMessage(content="", tool_calls=[_write_call("md", "/mnt/user-data/outputs/行动规划报告.md")]),
            ToolMessage(content="OK", tool_call_id="md", name="write_file"),
            AIMessage(
                content="",
                tool_calls=[_write_call("json", "/mnt/user-data/outputs/action-plan-subtasks.json")],
            ),
        ]
    }
    assert mw.after_model(state, _runtime(2)) is None


def test_after_model_truncates_second_present_files_in_same_response() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(
                content="",
                tool_calls=[_write_call("w1"), _present_call("p1"), _present_call("p2")],
            ),
        ]
    }
    update = mw.after_model(state, _runtime(1))
    assert update is not None
    assert [tc["id"] for tc in update["messages"][0].tool_calls] == ["w1", "p1"]


def test_after_model_strips_second_present_after_first_succeeded() -> None:
    """Screenshot bug: write+present already done, weak model presents the same file again."""
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请评估"),
            AIMessage(content="", tool_calls=[_write_call("w1"), _present_call("p1")]),
            ToolMessage(content="OK", tool_call_id="w1", name="write_file"),
            ToolMessage(content="Successfully presented files", tool_call_id="p1", name="present_files"),
            AIMessage(content="评估报告已交付", tool_calls=[_present_call("p2")]),
        ]
    }
    update = mw.after_model(state, _runtime(1))
    assert update is not None
    assert update["messages"][0].tool_calls == []
    assert update.get("jump_to") == "end"


def test_wrap_tool_call_rejects_second_present_files() -> None:
    mw = PositionArtifactCapMiddleware()
    state = {
        "messages": [
            HumanMessage(content="请交付"),
            AIMessage(content="", tool_calls=[_present_call("p1")]),
            ToolMessage(content="Successfully presented files", tool_call_id="p1", name="present_files"),
        ]
    }
    request = SimpleNamespace(
        tool_call=_present_call("p2"),
        runtime=_runtime(1),
        state=state,
    )
    called = {"n": 0}

    def handler(_request):
        called["n"] += 1
        return ToolMessage(content="Successfully presented files", tool_call_id="p2", name="present_files")

    result = mw.wrap_tool_call(request, handler)
    assert called["n"] == 0
    assert isinstance(result, ToolMessage)
    assert "已经呈现" in str(result.content)


def test_reminder_asks_present_only_when_not_yet_presented() -> None:
    assert "present_files" in (_reminder_for(writes_done=True, presents_done=False) or "")
    done = _reminder_for(writes_done=True, presents_done=True) or ""
    assert "已经 present_files" in done
    assert "请立即 present_files" not in done
    assert _reminder_for(writes_done=False, presents_done=False) is None


def test_successful_presents_counts_tool_result() -> None:
    messages = [
        HumanMessage(content="请交付"),
        AIMessage(content="", tool_calls=[_present_call("p1")]),
        ToolMessage(content="Successfully presented files", tool_call_id="p1", name="present_files"),
    ]
    assert _successful_presents(messages, turn_start=0) == 1