import uuid

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

from app.core.deps import get_current_user, get_db_session, require_study_member, require_study_roles, require_study_not_locked
from app.crud import audit as audit_crud
from app.crud import finance_special as special_crud
from app.crud import site as site_crud
from app.crud import study as study_crud
from app.schemas.finance_special import FinanceSpecialCreate, FinanceSpecialRead, FinanceSpecialUpdate

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_site_name_active(db: AsyncSession, study_id: uuid.UUID, site_name: str | None):
    if not site_name:
        return
    active_names = await site_crud.list_active_names(db, study_id)
    if site_name not in active_names:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="中心已停用")


@router.post(
    "/specials",
    response_model=FinanceSpecialRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def create_special(
    study_id: uuid.UUID,
    special_in: FinanceSpecialCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> FinanceSpecialRead:
    await _ensure_study_exists(db, study_id)
    await _ensure_site_name_active(db, study_id, special_in.site_name)
    item = await special_crud.create_special(db, study_id, special_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_special",
        entity_id=item.id,
        action="CREATE_FINANCE_SPECIAL",
        detail=f"特殊费用 {item.id} 已创建",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return FinanceSpecialRead.model_validate(item)


@router.get(
    "/specials",
    response_model=list[FinanceSpecialRead],
    dependencies=[Depends(require_study_member())],
)
async def list_specials(
    study_id: uuid.UUID,
    site_name: str | None = None,
    fee_type: str | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[FinanceSpecialRead]:
    await _ensure_study_exists(db, study_id)
    items = await special_crud.list_specials(db, study_id, site_name=site_name, fee_type=fee_type, skip=skip, limit=limit)
    return [FinanceSpecialRead.model_validate(item) for item in items]


@router.get(
    "/specials/{special_id}",
    response_model=FinanceSpecialRead,
    dependencies=[Depends(require_study_member())],
)
async def get_special(
    study_id: uuid.UUID,
    special_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> FinanceSpecialRead:
    await _ensure_study_exists(db, study_id)
    item = await special_crud.get_special(db, special_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="特殊费用不存在")
    return FinanceSpecialRead.model_validate(item)


@router.patch(
    "/specials/{special_id}",
    response_model=FinanceSpecialRead,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def update_special(
    study_id: uuid.UUID,
    special_id: uuid.UUID,
    special_in: FinanceSpecialUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> FinanceSpecialRead:
    await _ensure_study_exists(db, study_id)
    item = await special_crud.get_special(db, special_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="特殊费用不存在")
    await _ensure_site_name_active(db, study_id, item.site_name)
    item = await special_crud.update_special(db, item, special_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_special",
        entity_id=special_id,
        action="UPDATE_FINANCE_SPECIAL",
        detail=f"特殊费用 {special_id} 已更新",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return FinanceSpecialRead.model_validate(item)


@router.delete(
    "/specials/{special_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def delete_special(
    study_id: uuid.UUID,
    special_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    item = await special_crud.get_special(db, special_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="特殊费用不存在")
    await _ensure_site_name_active(db, study_id, item.site_name)
    await special_crud.delete_special(db, item)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_special",
        entity_id=special_id,
        action="DELETE_FINANCE_SPECIAL",
        detail=f"特殊费用 {special_id} 已删除",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )