import json
import uuid

from datetime import datetime

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

from app.core.deps import get_operator_role_label, get_current_user, get_db_session, require_api_permission
from app.crud import audit as audit_crud
from app.crud import study as study_crud
from app.models.user import User
from app.schemas.audit import AuditEventCreate, AuditLogRead
from app.services.ip_location import resolve_ip_location

router = APIRouter()


async def _build_export_audit_detail(db: AsyncSession, study_id: uuid.UUID, action: str) -> str:
    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")
    scope = "system" if action == "AUDIT_EXPORT_SYSTEM" else "project"
    description = "导出了系统审计日志" if scope == "system" else f"导出了项目审计日志：{study.name}"
    return json.dumps(
        {
            "targetName": "系统审计日志" if scope == "system" else study.name,
            "scope": scope,
            "description": description,
            "result": "SUCCESS",
        },
        ensure_ascii=False,
    )


@router.get(
    "/",
    response_model=list[AuditLogRead],
    dependencies=[Depends(require_api_permission("audit_logs:read"))],
)
async def list_audit_logs(
    study_id: uuid.UUID,
    entity_type: str | None = None,
    entity_id: uuid.UUID | None = None,
    action: str | None = None,
    operator_id: uuid.UUID | None = None,
    client_ip: str | None = None,
    client_type: str | None = None,
    start_time: datetime | None = None,
    end_time: datetime | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[AuditLogRead]:
    logs = await audit_crud.list_logs(
        db,
        study_id=study_id,
        entity_type=entity_type,
        entity_id=entity_id,
        action=action,
        operator_id=operator_id,
        client_ip=client_ip,
        client_type=client_type,
        start_time=start_time,
        end_time=end_time,
        skip=skip,
        limit=limit,
    )
    operator_ids = {log.operator_id for log in logs}
    operator_map: dict[uuid.UUID, User] = {}
    if operator_ids:
        result = await db.execute(select(User).where(User.id.in_(operator_ids)))
        operator_map = {user.id: user for user in result.scalars().all()}

    items: list[AuditLogRead] = []
    for log in logs:
        ip_location = resolve_ip_location(log.client_ip)
        operator = operator_map.get(log.operator_id)
        items.append(
            AuditLogRead(
                id=log.id,
                study_id=log.study_id,
                entity_type=log.entity_type,
                entity_id=log.entity_id,
                action=log.action,
                detail=log.detail,
                operator_id=log.operator_id,
                operator_name=operator.full_name if operator else None,
                operator_email=operator.email if operator else None,
                operator_role=log.operator_role,
                client_ip=log.client_ip,
                ip_location=ip_location.location,
                ip_country=ip_location.country,
                ip_province=ip_location.province,
                ip_city=ip_location.city,
                ip_isp=ip_location.isp,
                user_agent=log.user_agent,
                client_type=log.client_type,
                client_version=log.client_version,
                client_platform=log.client_platform,
                build_channel=log.build_channel,
                build_commit=log.build_commit,
                created_at=log.created_at,
            )
        )
    return items


@router.post(
    "/events",
    status_code=status.HTTP_201_CREATED,
)
async def create_audit_event(
    study_id: uuid.UUID,
    payload: AuditEventCreate,
    _export_permission=Depends(require_api_permission("audit_logs:export")),
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
):
    allowed_actions = {"AUDIT_EXPORT_SYSTEM", "AUDIT_EXPORT_PROJECT"}
    if payload.action not in allowed_actions:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="不支持的审计事件")
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="audit_log",
        entity_id=None,
        action=payload.action,
        detail=await _build_export_audit_detail(db, study_id, payload.action),
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return {"ok": True}