from __future__ import annotations

import pytest

from yuxi.channel.domain.service.pipeline import Pipeline
from yuxi.channel.domain.service.message_context import MessageContext, Span
from yuxi.channel.domain.middleware.middleware import Middleware, CallNext
from yuxi.channel.domain.model.message.unified_message import UnifiedMessage
from yuxi.channel.domain.model.message.peer import Peer
from yuxi.channel.domain.model.shared.channel_type import ChannelType


class _FakeMiddleware:
    def __init__(self, name: str) -> None:
        self._name = name

    @property
    def name(self) -> str:
        return self._name

    async def process(self, ctx: MessageContext, call_next: CallNext) -> MessageContext:
        return await call_next(ctx)


class _AbortMiddleware:
    def __init__(self, name: str) -> None:
        self._name = name

    @property
    def name(self) -> str:
        return self._name

    async def process(self, ctx: MessageContext, call_next: CallNext) -> MessageContext:
        ctx.abort("aborted", "TEST")
        return ctx


class _SkipMiddleware:
    def __init__(self, name: str) -> None:
        self._name = name

    @property
    def name(self) -> str:
        return self._name

    async def process(self, ctx: MessageContext, call_next: CallNext) -> MessageContext:
        ctx.skip()
        return ctx


class _ErrorMiddleware:
    def __init__(self, name: str) -> None:
        self._name = name

    @property
    def name(self) -> str:
        return self._name

    async def process(self, ctx: MessageContext, call_next: CallNext) -> MessageContext:
        raise RuntimeError("boom")


class _FakeMetrics:
    def __init__(self) -> None:
        self.middleware_durations: list[tuple[str, str, float]] = []
        self.pipeline_duration: tuple[str, float] | None = None
        self.pipeline_total: str | None = None
        self.pipeline_aborted: tuple[str, str] | None = None

    async def record_middleware_duration(self, middleware: str, channel_type: str, duration_s: float) -> None:
        self.middleware_durations.append((middleware, channel_type, duration_s))

    async def record_pipeline_duration(self, channel_type: str, duration_s: float) -> None:
        self.pipeline_duration = (channel_type, duration_s)

    async def record_pipeline_total(self, channel_type: str) -> None:
        self.pipeline_total = channel_type

    async def record_pipeline_aborted(self, channel_type: str, reason: str) -> None:
        self.pipeline_aborted = (channel_type, reason)


@pytest.fixture
def sample_message() -> UnifiedMessage:
    return UnifiedMessage(
        message_id="msg-1",
        channel_type=ChannelType.FEISHU,
        sender=Peer(id="user-1", name="Alice"),
        content="hello",
    )


@pytest.mark.asyncio
async def test_pipeline_empty(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([])
    ctx = MessageContext(message=sample_message)
    result = await pipeline.execute(ctx)
    assert result.message == sample_message
    assert result.spans == []


@pytest.mark.asyncio
async def test_pipeline_single_middleware(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([_FakeMiddleware("test")])
    ctx = MessageContext(message=sample_message)
    result = await pipeline.execute(ctx)
    assert result.message == sample_message
    assert len(result.spans) == 1
    assert result.spans[0].middleware_name == "test"
    assert result.spans[0].aborted is False
    assert result.spans[0].skipped is False


@pytest.mark.asyncio
async def test_pipeline_multiple_middlewares(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([_FakeMiddleware("m1"), _FakeMiddleware("m2")])
    ctx = MessageContext(message=sample_message)
    result = await pipeline.execute(ctx)
    assert len(result.spans) == 2
    assert result.spans[0].middleware_name == "m1"
    assert result.spans[1].middleware_name == "m2"


@pytest.mark.asyncio
async def test_pipeline_abort_stops_chain(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([_AbortMiddleware("abort"), _FakeMiddleware("after")])
    ctx = MessageContext(message=sample_message)
    result = await pipeline.execute(ctx)
    assert result.is_aborted is True
    assert len(result.spans) == 1
    assert result.spans[0].middleware_name == "abort"
    assert result.spans[0].aborted is True


@pytest.mark.asyncio
async def test_pipeline_skip_stops_chain(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([_SkipMiddleware("skip"), _FakeMiddleware("after")])
    ctx = MessageContext(message=sample_message)
    result = await pipeline.execute(ctx)
    assert result.is_skipped is True
    assert len(result.spans) == 1
    assert result.spans[0].middleware_name == "skip"
    assert result.spans[0].skipped is True


@pytest.mark.asyncio
async def test_pipeline_exception_raises(sample_message: UnifiedMessage) -> None:
    pipeline = Pipeline([_ErrorMiddleware("error")])
    ctx = MessageContext(message=sample_message)
    with pytest.raises(RuntimeError, match="boom"):
        await pipeline.execute(ctx)


@pytest.mark.asyncio
async def test_pipeline_with_metrics(sample_message: UnifiedMessage) -> None:
    metrics = _FakeMetrics()
    pipeline = Pipeline([_FakeMiddleware("m1")], metrics=metrics)
    ctx = MessageContext(message=sample_message, channel_type="feishu")
    await pipeline.execute(ctx)
    assert len(metrics.middleware_durations) == 1
    assert metrics.middleware_durations[0][0] == "m1"
    assert metrics.pipeline_total == "feishu"
    assert metrics.pipeline_duration is not None
    assert metrics.pipeline_duration[0] == "feishu"


@pytest.mark.asyncio
async def test_pipeline_aborted_metrics(sample_message: UnifiedMessage) -> None:
    metrics = _FakeMetrics()
    pipeline = Pipeline([_AbortMiddleware("abort")], metrics=metrics)
    ctx = MessageContext(message=sample_message, channel_type="web")
    await pipeline.execute(ctx)
    assert metrics.pipeline_aborted is not None
    assert metrics.pipeline_aborted[0] == "web"
    assert metrics.pipeline_aborted[1] == "TEST"


def test_pipeline_middlewares_property() -> None:
    m1 = _FakeMiddleware("m1")
    pipeline = Pipeline([m1])
    assert pipeline.middlewares == [m1]