import uuid
import json

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_member, require_api_permission, require_study_not_locked
from app.core.decorators import register_api_endpoint
from app.crud import audit as audit_crud
from app.crud import site as site_crud
from app.crud import startup as startup_crud
from app.crud import study as study_crud
from app.schemas.site import SiteCreate, SiteRead, SiteUpdate
from app.schemas.startup import StartupEthicsCreate, StartupFeasibilityCreate

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


@router.post(
    "/",
    response_model=SiteRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_api_permission("sites:create")), Depends(require_study_not_locked())],
)
@register_api_endpoint(
    endpoint_key="sites:create",
    module="sites",
    action="write",
    description="创建中心",
    default_roles=["PM"],
)
async def create_site(
    study_id: uuid.UUID,
    site_in: SiteCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> SiteRead:
    await _ensure_study_exists(db, study_id)
    site = await site_crud.create_site(db, study_id, site_in)
    await startup_crud.create_feasibility(
        db,
        study_id,
        StartupFeasibilityCreate(site_id=site.id),
        created_by=getattr(current_user, "id", None),
    )
    await startup_crud.create_ethics(
        db,
        study_id,
        StartupEthicsCreate(site_id=site.id),
        created_by=getattr(current_user, "id", None),
    )
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="site",
        entity_id=site.id,
        action="SITE_CREATED",
        detail=json.dumps({"targetName": site.name, "after": {"name": site.name, "is_active": site.is_active}}, ensure_ascii=False),
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return site


@router.get(
    "/",
    response_model=list[SiteRead],
    dependencies=[Depends(require_api_permission("sites:read")), Depends(require_study_member())],
)
@register_api_endpoint(
    endpoint_key="sites:read",
    module="sites",
    action="read",
    description="查询中心列表",
    default_roles=["PM", "CRA", "PV", "MEDICAL_REVIEW", "IMP", "QA"],
)
async def list_sites(
    study_id: uuid.UUID,
    skip: int = 0,
    limit: int = 100,
    include_inactive: bool = False,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> list[SiteRead]:
    await _ensure_study_exists(db, study_id)
    cra_scope = await get_cra_site_scope(db, study_id, current_user)
    site_ids = cra_scope[0] if cra_scope else None
    sites = await site_crud.list_by_study(
        db,
        study_id,
        skip=skip,
        limit=limit,
        include_inactive=include_inactive,
        site_ids=site_ids,
    )
    return list(sites)


@router.patch(
    "/{site_id}",
    response_model=SiteRead,
    dependencies=[Depends(require_api_permission("sites:update")), Depends(require_study_not_locked())],
)
@register_api_endpoint(
    endpoint_key="sites:update",
    module="sites",
    action="write",
    description="更新中心",
    default_roles=["PM"],
)
async def update_site(
    study_id: uuid.UUID,
    site_id: uuid.UUID,
    site_in: SiteUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> SiteRead:
    await _ensure_study_exists(db, study_id)
    site = await site_crud.get_site(db, site_id)
    if not site or site.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="分中心不存在")
    before_data = {
        "name": site.name,
        "city": site.city,
        "pi_name": site.pi_name,
        "phone": site.phone,
        "contact": site.contact,
        "is_active": site.is_active,
    }
    updated = await site_crud.update_site(db, site, site_in)
    after_data = {
        "name": updated.name,
        "city": updated.city,
        "pi_name": updated.pi_name,
        "phone": updated.phone,
        "contact": updated.contact,
        "is_active": updated.is_active,
    }
    action = "SITE_STATUS_CHANGED" if before_data.get("is_active") != after_data.get("is_active") else "SITE_UPDATED"
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="site",
        entity_id=updated.id,
        action=action,
        detail=json.dumps({"targetName": updated.name, "before": before_data, "after": after_data}, ensure_ascii=False),
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return updated


@router.delete(
    "/{site_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_api_permission("sites:delete")), Depends(require_study_not_locked())],
)
@register_api_endpoint(
    endpoint_key="sites:delete",
    module="sites",
    action="write",
    description="删除中心",
    default_roles=["PM"],
)
async def delete_site(
    study_id: uuid.UUID,
    site_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    site = await site_crud.get_site(db, site_id)
    if not site or site.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="分中心不存在")
    before_data = {
        "name": site.name,
        "city": site.city,
        "pi_name": site.pi_name,
        "phone": site.phone,
        "contact": site.contact,
        "is_active": site.is_active,
    }
    await site_crud.delete_site_and_related(db, site)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="site",
        entity_id=site_id,
        action="SITE_DELETED",
        detail=json.dumps({"targetName": site.name, "before": before_data, "after": {"deleted": True}}, ensure_ascii=False),
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return None