"""Admin 管理后台路由 — 租户 CRUD + 用户管理 + 审计日志。"""

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

from app.core.database import get_db
from app.core.dependencies import get_current_user, require_role
from app.models.audit import AuditLog
from app.models.tenant import Tenant
from app.models.user import User
from app.schemas.common import ApiResponse, success

router = APIRouter(prefix="/admin", tags=["admin"])


@router.get("/overview", response_model=ApiResponse[dict])
async def admin_overview(
    db: AsyncSession = Depends(get_db),
    user: User = Depends(require_role("admin")),
):
    """系统概览。"""
    tenants_result = await db.execute(select(Tenant))
    tenants = tenants_result.scalars().all()

    users_result = await db.execute(select(User))
    users = users_result.scalars().all()

    return success(data={
        "tenant_count": len(tenants),
        "user_count": len(users),
        "tenants": [{"id": str(t.id), "name": t.name} for t in tenants],
    })


@router.get("/tenants", response_model=ApiResponse[list])
async def list_tenants(
    db: AsyncSession = Depends(get_db),
    user: User = Depends(require_role("admin")),
):
    """租户管理列表。"""
    result = await db.execute(select(Tenant))
    items = result.scalars().all()
    return success(data=[
        {"id": str(i.id), "name": i.name, "created_at": i.created_at.isoformat() if i.created_at else None}
        for i in items
    ])


@router.get("/users", response_model=ApiResponse[list])
async def list_users(
    db: AsyncSession = Depends(get_db),
    user: User = Depends(require_role("admin")),
):
    """用户管理列表。"""
    result = await db.execute(select(User))
    items = result.scalars().all()
    return success(data=[
        {"id": str(i.id), "email": i.email, "name": i.name, "role": i.role, "tenant_id": str(i.tenant_id), "is_active": i.is_active}
        for i in items
    ])


@router.get("/audit-logs", response_model=ApiResponse[list])
async def list_audit_logs(
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
    user: User = Depends(require_role("admin")),
):
    """审计日志查看。"""
    offset = (page - 1) * page_size
    result = await db.execute(
        select(AuditLog).order_by(AuditLog.created_at.desc()).offset(offset).limit(page_size)
    )
    items = result.scalars().all()
    return success(data=[
        {
            "id": str(i.id),
            "user_id": str(i.user_id) if i.user_id else None,
            "action": i.action,
            "target_type": i.resource_type,
            "target_id": i.resource_id,
            "detail": i.detail_json,
            "created_at": i.created_at.isoformat() if i.created_at else None,
        }
        for i in items
    ])