import uuid

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

from app.core.deps import get_cra_site_scope, 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 finance_contract as contract_crud
from app.crud import site as site_crud
from app.crud import study as study_crud
from app.schemas.finance_contract import FinanceContractCreate, FinanceContractRead, FinanceContractUpdate

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(
    "/contracts",
    response_model=FinanceContractRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_api_permission("POST:/finance/contracts")), Depends(require_study_not_locked())],
)
async def create_contract(
    study_id: uuid.UUID,
    contract_in: FinanceContractCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> FinanceContractRead:
    await _ensure_study_exists(db, study_id)
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    if cra_scope and contract_in.site_name not in cra_scope[1]:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
    await _ensure_site_name_active(db, study_id, contract_in.site_name)
    contract = await contract_crud.create_contract(db, study_id, contract_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_contract",
        entity_id=contract.id,
        action="CREATE_FINANCE_CONTRACT",
        detail=f"合同费用 {contract.contract_no} 已创建",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return FinanceContractRead.model_validate(contract)


@router.get(
    "/contracts",
    response_model=list[FinanceContractRead],
    dependencies=[Depends(require_api_permission("GET:/finance/contracts"))],
)
async def list_contracts(
    study_id: uuid.UUID,
    site_name: str | None = None,
    contract_no: str | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> list[FinanceContractRead]:
    await _ensure_study_exists(db, study_id)
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    site_names = cra_scope[1] if cra_scope else None
    if site_name and site_names is not None and site_name not in site_names:
        return []
    items = await contract_crud.list_contracts(
        db,
        study_id,
        site_name=site_name,
        site_names=site_names,
        contract_no=contract_no,
        skip=skip,
        limit=limit,
    )
    return [FinanceContractRead.model_validate(item) for item in items]


@router.get(
    "/contracts/{contract_id}",
    response_model=FinanceContractRead,
    dependencies=[Depends(require_api_permission("GET:/finance/contracts/{id}"))],
)
async def get_contract(
    study_id: uuid.UUID,
    contract_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> FinanceContractRead:
    await _ensure_study_exists(db, study_id)
    contract = await contract_crud.get_contract(db, contract_id)
    if not contract or contract.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="合同不存在")
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    if cra_scope and contract.site_name not in cra_scope[1]:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
    return FinanceContractRead.model_validate(contract)


@router.patch(
    "/contracts/{contract_id}",
    response_model=FinanceContractRead,
    dependencies=[Depends(require_api_permission("PATCH:/finance/contracts/{id}")), Depends(require_study_not_locked())],
)
async def update_contract(
    study_id: uuid.UUID,
    contract_id: uuid.UUID,
    contract_in: FinanceContractUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> FinanceContractRead:
    await _ensure_study_exists(db, study_id)
    contract = await contract_crud.get_contract(db, contract_id)
    if not contract or contract.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="合同不存在")
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    if cra_scope and contract.site_name not in cra_scope[1]:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
    await _ensure_site_name_active(db, study_id, contract.site_name)
    contract = await contract_crud.update_contract(db, contract, contract_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_contract",
        entity_id=contract_id,
        action="UPDATE_FINANCE_CONTRACT",
        detail=f"合同费用 {contract_id} 已更新",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return FinanceContractRead.model_validate(contract)


@router.delete(
    "/contracts/{contract_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_api_permission("DELETE:/finance/contracts/{id}")), Depends(require_study_not_locked())],
)
async def delete_contract(
    study_id: uuid.UUID,
    contract_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    contract = await contract_crud.get_contract(db, contract_id)
    if not contract or contract.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="合同不存在")
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    if cra_scope and contract.site_name not in cra_scope[1]:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
    await _ensure_site_name_active(db, study_id, contract.site_name)
    await contract_crud.delete_contract(db, contract)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="finance_contract",
        entity_id=contract_id,
        action="DELETE_FINANCE_CONTRACT",
        detail=f"合同费用 {contract_id} 已删除",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )