import uuid

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.deps import get_operator_role_label, get_current_user, get_db_session, require_study_not_locked, require_api_permission
from app.crud import audit as audit_crud
from app.crud import site as site_crud
from app.crud import subject as subject_crud
from app.crud import subject_history as history_crud
from app.crud import study as study_crud
from app.schemas.subject_history import SubjectHistoryCreate, SubjectHistoryRead, SubjectHistoryUpdate

router = APIRouter()


async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
    study = await study_crud.get(db, study_id)
    if not study:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="项目不存在")
    return study


async def _ensure_subject_active(db: AsyncSession, subject) -> None:
    if not subject or not subject.site_id:
        return
    site = await site_crud.get_site(db, subject.site_id)
    if not site or not site.is_active:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="中心已停用")


@router.post(
    "/histories",
    response_model=SubjectHistoryRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_api_permission("subject_histories:create"))],
)
async def create_history(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    history_in: SubjectHistoryCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> SubjectHistoryRead:
    await _ensure_study_exists(db, study_id)
    subject = await subject_crud.get_subject(db, subject_id)
    if not subject or subject.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="参与者不存在")
    await _ensure_subject_active(db, subject)
    if history_in.subject_id != subject_id:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="参与者不匹配")
    history = await history_crud.create_history(db, study_id, history_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="subject_history",
        entity_id=history.id,
        action="CREATE_SUBJECT_HISTORY",
        detail="病史记录已创建",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return SubjectHistoryRead.model_validate(history)


@router.get(
    "/histories",
    response_model=list[SubjectHistoryRead],
    dependencies=[Depends(require_api_permission("subject_histories:list"))],
)
async def list_histories(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    skip: int = 0,
    limit: int = 200,
    db: AsyncSession = Depends(get_db_session),
) -> list[SubjectHistoryRead]:
    await _ensure_study_exists(db, study_id)
    subject = await subject_crud.get_subject(db, subject_id)
    if not subject or subject.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="参与者不存在")
    items = await history_crud.list_histories(db, study_id, subject_id, skip=skip, limit=limit)
    return [SubjectHistoryRead.model_validate(item) for item in items]


@router.get(
    "/histories/{history_id}",
    response_model=SubjectHistoryRead,
    dependencies=[Depends(require_api_permission("subject_histories:read"))],
)
async def get_history(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    history_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> SubjectHistoryRead:
    await _ensure_study_exists(db, study_id)
    subject = await subject_crud.get_subject(db, subject_id)
    if not subject or subject.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="参与者不存在")
    history = await history_crud.get_history(db, history_id)
    if not history or history.study_id != study_id or history.subject_id != subject_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="病史记录不存在")
    return SubjectHistoryRead.model_validate(history)


@router.patch(
    "/histories/{history_id}",
    response_model=SubjectHistoryRead,
    dependencies=[Depends(require_api_permission("subject_histories:update"))],
)
async def update_history(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    history_id: uuid.UUID,
    history_in: SubjectHistoryUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> SubjectHistoryRead:
    await _ensure_study_exists(db, study_id)
    subject = await subject_crud.get_subject(db, subject_id)
    if not subject or subject.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="参与者不存在")
    history = await history_crud.get_history(db, history_id)
    if not history or history.study_id != study_id or history.subject_id != subject_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="病史记录不存在")
    history = await history_crud.update_history(db, history, history_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="subject_history",
        entity_id=history_id,
        action="UPDATE_SUBJECT_HISTORY",
        detail="病史记录已更新",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return SubjectHistoryRead.model_validate(history)


@router.delete(
    "/histories/{history_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_api_permission("subject_histories:delete"))],
)
async def delete_history(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    history_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    subject = await subject_crud.get_subject(db, subject_id)
    if not subject or subject.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="参与者不存在")
    history = await history_crud.get_history(db, history_id)
    if not history or history.study_id != study_id or history.subject_id != subject_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="病史记录不存在")
    await history_crud.delete_history(db, history)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="subject_history",
        entity_id=history_id,
        action="DELETE_SUBJECT_HISTORY",
        detail="病史记录已删除",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )