"""内部评测 REST API。"""

from __future__ import annotations

import json
from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, Query
from fastapi.responses import StreamingResponse
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.db import get_async_db
from app.features.evaluation.admin_service import EvaluationAdminService
from app.features.evaluation.deps import (
    get_eval_judge_manual_service,
    get_evaluation_admin_service,
    get_memoir_readiness_service,
    get_replay_conversation_service,
)
from app.features.evaluation.errors import (
    EvaluationBadRequestError,
    EvaluationNotFoundError,
)
from app.features.evaluation.importers.user_export_markdown import (
    extract_memoir_chapter_sections_from_export_md,
    extract_source_user_id_from_export_md,
)
from app.features.evaluation.internal_auth import InternalEvalAuth
from app.features.evaluation.judge_manual_service import EvalJudgeManualService
from app.features.evaluation.memoir_readiness_service import MemoirReadinessService
from app.features.evaluation.replay_service import ReplayConversationService
from app.features.evaluation.schemas import (
    EvalSandboxOut,
    ManualJudgeConversationBody,
    ManualJudgeConversationOut,
    ManualJudgeConversationStreamBody,
    ManualJudgeMemoirBody,
    ManualJudgeMemoirOut,
    MemoirPhase1ReadyOut,
    MemoirSectionBaselineOut,
    MemoirSubmitOut,
    PlaygroundConversationJudgeOut,
    ReplayBootstrapBody,
    ReplayBootstrapOut,
    ReplayConversationBody,
    ReplayConversationOut,
    RetryBaselineJudgeBody,
    RetryBaselineJudgeOut,
    SessionDialogueOut,
    SessionListItem,
    SessionListResponse,
    SessionTranscriptOut,
    UserExportFixtureDetailOut,
    UserExportFixtureListOut,
    UserExportFixtureTurnOut,
    UserMemoirSnapshotOut,
)
from app.features.evaluation.session_catalog_service import SessionCatalogService
from app.features.evaluation.user_export_fixtures import read_user_export_fixture

router = APIRouter(tags=["internal-evaluation"])


@router.get("/ping", include_in_schema=False)
async def eval_api_ping() -> dict[str, str | bool]:
    """无鉴权：确认当前进程是 internal_main 且路由已挂载。"""
    return {"ok": True, "service": "life-echo-internal-eval"}


def _eval_http_exc(
    e: EvaluationNotFoundError | EvaluationBadRequestError,
) -> HTTPException:
    if isinstance(e, EvaluationNotFoundError):
        return HTTPException(status_code=404, detail=e.detail)
    return HTTPException(status_code=400, detail=e.detail)


@router.get("/sessions", response_model=SessionListResponse)
async def list_sessions(
    _auth: InternalEvalAuth,
    db: Annotated[AsyncSession, Depends(get_async_db)],
    offset: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    user_id: str | None = Query(None),
    q: str | None = Query(None),
    status: str | None = Query(
        None,
        description="按会话 status 过滤，如 active",
    ),
):
    catalog = SessionCatalogService(db)
    rows, total = await catalog.list_sessions(
        offset=offset, limit=limit, user_id=user_id, q=q, status=status
    )
    return SessionListResponse(
        items=[
            SessionListItem(
                id=r.id,
                user_id=r.user_id,
                user_phone=r.user_phone,
                started_at=r.started_at,
                last_message_at=r.last_message_at,
                conversation_stage=r.conversation_stage,
                current_topic=r.current_topic,
                status=r.status,
            )
            for r in rows
        ],
        total=total,
    )


@router.get(
    "/sessions/{conversation_id}/dialogue",
    response_model=SessionDialogueOut,
)
async def get_session_dialogue(
    conversation_id: str,
    _auth: InternalEvalAuth,
    db: Annotated[AsyncSession, Depends(get_async_db)],
):
    catalog = SessionCatalogService(db)
    out = await catalog.get_session_dialogue(conversation_id)
    if not out:
        raise HTTPException(status_code=404, detail="conversation not found")
    return out


@router.get(
    "/sessions/{conversation_id}/transcript", response_model=SessionTranscriptOut
)
async def get_session_transcript(
    conversation_id: str,
    _auth: InternalEvalAuth,
    db: Annotated[AsyncSession, Depends(get_async_db)],
):
    catalog = SessionCatalogService(db)
    tr = await catalog.get_transcript(conversation_id)
    if not tr:
        raise HTTPException(status_code=404, detail="conversation not found")
    return SessionTranscriptOut(
        conversation_id=tr.conversation_id,
        user_id=tr.user_id,
        user_utterances_from_segments=tr.user_utterances_from_segments,
        user_utterances_from_messages=tr.user_utterances_from_messages,
    )


@router.get(
    "/sessions/{conversation_id}/playground-conversation-judge",
    response_model=PlaygroundConversationJudgeOut,
)
async def get_playground_conversation_judge(
    conversation_id: str,
    _auth: InternalEvalAuth,
    db: Annotated[AsyncSession, Depends(get_async_db)],
):
    catalog = SessionCatalogService(db)
    tr = await catalog.get_transcript(conversation_id)
    if not tr:
        raise HTTPException(status_code=404, detail="conversation not found")
    judge = await catalog.get_playground_conversation_judge_json(conversation_id)
    return PlaygroundConversationJudgeOut(
        conversation_id=conversation_id,
        judge=judge,
    )


@router.get(
    "/sessions/{conversation_id}/memoir-phase1-ready",
    response_model=MemoirPhase1ReadyOut,
)
async def memoir_phase1_ready(
    conversation_id: str,
    _auth: InternalEvalAuth,
    svc: Annotated[
        MemoirReadinessService, Depends(get_memoir_readiness_service)
    ],
    segment_ids: Annotated[
        list[str],
        Query(
            min_length=1,
            description="本批待检查的 segment id，可重复 query 参数 segment_ids=id1&segment_ids=id2",
        ),
    ],
):
    try:
        return await svc.memoir_phase1_ready_for_segments(
            conversation_id=conversation_id,
            segment_ids=segment_ids,
        )
    except EvaluationNotFoundError as e:
        raise _eval_http_exc(e) from e
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e


@router.post(
    "/sessions/{conversation_id}/memoir-submit",
    response_model=MemoirSubmitOut,
)
async def memoir_submit_phase1(
    conversation_id: str,
    _auth: InternalEvalAuth,
    svc: Annotated[
        MemoirReadinessService, Depends(get_memoir_readiness_service)
    ],
):
    try:
        return await svc.submit_memoir_phase1_for_conversation(
            conversation_id=conversation_id,
        )
    except EvaluationNotFoundError as e:
        raise _eval_http_exc(e) from e
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e


@router.post("/sessions/replay-bootstrap", response_model=ReplayBootstrapOut)
async def replay_bootstrap(
    body: ReplayBootstrapBody,
    _auth: InternalEvalAuth,
    replay: Annotated[
        ReplayConversationService, Depends(get_replay_conversation_service)
    ],
):
    try:
        cid = await replay.bootstrap_conversation(body.user_id)
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return ReplayBootstrapOut(conversation_id=cid)


@router.post("/sessions/eval-sandbox", response_model=EvalSandboxOut)
async def create_eval_sandbox(
    _auth: InternalEvalAuth,
    replay: Annotated[
        ReplayConversationService, Depends(get_replay_conversation_service)
    ],
):
    try:
        uid, cid, phone, nick = await replay.create_eval_sandbox()
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return EvalSandboxOut(
        user_id=uid,
        conversation_id=cid,
        phone=phone,
        nickname=nick,
    )


@router.post("/replay/conversation", response_model=ReplayConversationOut)
async def replay_conversation(
    body: ReplayConversationBody,
    _auth: InternalEvalAuth,
    replay: Annotated[
        ReplayConversationService, Depends(get_replay_conversation_service)
    ],
):
    if body.fixture_filename and body.user_utterances:
        raise HTTPException(
            status_code=400,
            detail="provide only one of fixture_filename or user_utterances",
        )
    try:
        segment_ids: list[str] = []
        if body.fixture_filename:
            fn = body.fixture_filename.strip()
            n, echo, segment_ids = await replay.replay_fixture(
                conversation_id=body.conversation_id,
                fixture_filename=fn,
                flush_memoir_after=body.flush_memoir_after,
                skip_memoir=body.skip_memoir,
                skip_tts=body.skip_tts,
            )
        elif body.user_utterances is not None:
            utt = [str(u) for u in body.user_utterances if str(u).strip()]
            if not utt:
                raise EvaluationBadRequestError("user_utterances is empty")
            n, segment_ids = await replay.replay_utterances(
                conversation_id=body.conversation_id,
                utterances=utt,
                flush_memoir_after=body.flush_memoir_after,
                skip_memoir=body.skip_memoir,
                skip_tts=body.skip_tts,
            )
            echo = utt
        else:
            raise EvaluationBadRequestError(
                "fixture_filename or user_utterances required"
            )
    except EvaluationNotFoundError as e:
        raise _eval_http_exc(e) from e
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return ReplayConversationOut(
        conversation_id=body.conversation_id,
        turns_replayed=n,
        utterances_echo=echo,
        segment_ids=segment_ids,
    )


@router.post("/judge/conversation", response_model=ManualJudgeConversationOut)
async def judge_conversation_manual(
    body: ManualJudgeConversationBody,
    _auth: InternalEvalAuth,
    judge_svc: Annotated[
        EvalJudgeManualService, Depends(get_eval_judge_manual_service)
    ],
):
    try:
        payload = await judge_svc.judge_conversation(
            body.conversation_id,
            body.fixture_filename,
            judge_provider=body.judge_provider,
            judge_model=body.judge_model,
        )
    except EvaluationNotFoundError as e:
        raise _eval_http_exc(e) from e
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return ManualJudgeConversationOut.model_validate(payload)


@router.post("/judge/conversation-stream")
async def judge_conversation_manual_stream(
    body: ManualJudgeConversationStreamBody,
    _auth: InternalEvalAuth,
    judge_svc: Annotated[
        EvalJudgeManualService, Depends(get_eval_judge_manual_service)
    ],
):
    async def event_iter():
        try:
            async for evt in judge_svc.iter_conversation_judge_sse(
                body.conversation_id,
                body.fixture_filename,
                include_turn_judges=body.include_turn_judges,
                include_baseline_turn_judges=body.include_baseline_turn_judges,
                judge_provider=body.judge_provider,
                judge_model=body.judge_model,
            ):
                yield f"data: {json.dumps(evt, ensure_ascii=False)}\n\n"
        except Exception as e:
            err = json.dumps(
                {"event": "error", "phase": "server", "message": str(e)},
                ensure_ascii=False,
            )
            yield f"data: {err}\n\n"
            yield f"data: {json.dumps({'event': 'done'}, ensure_ascii=False)}\n\n"

    return StreamingResponse(
        event_iter(),
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no",
        },
    )


@router.post(
    "/judge/conversation-retry-baseline",
    response_model=RetryBaselineJudgeOut,
)
async def retry_baseline_conversation_judge(
    body: RetryBaselineJudgeBody,
    _auth: InternalEvalAuth,
    judge_svc: Annotated[
        EvalJudgeManualService, Depends(get_eval_judge_manual_service)
    ],
):
    try:
        payload = await judge_svc.retry_baseline_conversation_judge(
            body.conversation_id,
            body.fixture_filename,
            include_baseline_turn_judges=body.include_baseline_turn_judges,
            judge_provider=body.judge_provider,
            judge_model=body.judge_model,
        )
    except EvaluationNotFoundError as e:
        raise _eval_http_exc(e) from e
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return RetryBaselineJudgeOut.model_validate(payload)


@router.post("/judge/memoir-chapters", response_model=ManualJudgeMemoirOut)
async def judge_memoir_chapters_manual(
    body: ManualJudgeMemoirBody,
    _auth: InternalEvalAuth,
    judge_svc: Annotated[
        EvalJudgeManualService, Depends(get_eval_judge_manual_service)
    ],
):
    try:
        payload = await judge_svc.judge_memoir_for_user(
            body.user_id,
            body.baseline_sections,
            judge_provider=body.judge_provider,
            judge_model=body.judge_model,
        )
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return ManualJudgeMemoirOut.model_validate(payload)


@router.get("/users/{user_id}/memoir-snapshot", response_model=UserMemoirSnapshotOut)
async def get_user_memoir_snapshot(
    user_id: str,
    _auth: InternalEvalAuth,
    judge_svc: Annotated[
        EvalJudgeManualService, Depends(get_eval_judge_manual_service)
    ],
):
    try:
        payload = await judge_svc.memoir_snapshot(user_id)
    except EvaluationBadRequestError as e:
        raise _eval_http_exc(e) from e
    return UserMemoirSnapshotOut.model_validate(payload)


@router.get(
    "/fixtures/user-exports",
    response_model=UserExportFixtureListOut,
)
async def list_user_export_fixtures(
    _auth: InternalEvalAuth,
    svc: Annotated[EvaluationAdminService, Depends(get_evaluation_admin_service)],
):
    return UserExportFixtureListOut(items=svc.list_user_export_fixture_names())


@router.get(
    "/fixtures/user-exports/{filename}",
    response_model=UserExportFixtureDetailOut,
)
async def get_user_export_fixture(
    filename: str,
    _auth: InternalEvalAuth,
):
    try:
        turns, raw_md = read_user_export_fixture(filename)
    except ValueError:
        raise HTTPException(
            status_code=400, detail="invalid fixture filename"
        ) from None
    except FileNotFoundError:
        raise HTTPException(status_code=404, detail="fixture not found") from None
    memoir_tuples = extract_memoir_chapter_sections_from_export_md(raw_md)
    return UserExportFixtureDetailOut(
        filename=filename,
        turns=[UserExportFixtureTurnOut(user=u, ai=a) for u, a in turns],
        source_user_id=extract_source_user_id_from_export_md(raw_md),
        memoir_sections=[
            MemoirSectionBaselineOut(title=t, body=b) for t, b in memoir_tuples
        ],
    )