"""
租户管理 API
"""

import os
import json
from datetime import datetime
from typing import Optional, List

import pymysql
from fastapi import APIRouter, Depends, HTTPException, status, Query

from .auth import get_current_admin, require_superadmin, get_db_connection, AdminUserInfo
from .schemas import (
    TenantCreate,
    TenantUpdate,
    TenantResponse,
    TenantListResponse,
    ResponseModel,
)

router = APIRouter(prefix="/tenants", tags=["租户管理"])


def log_operation(cursor, admin: AdminUserInfo, tenant_id: int, tenant_code: str,
                  operation_type: str, resource_type: str, resource_id: int,
                  resource_name: str, old_value: dict = None, new_value: dict = None):
    """记录操作日志"""
    cursor.execute(
        """
        INSERT INTO operation_logs 
        (admin_user_id, admin_username, tenant_id, tenant_code, operation_type, 
         resource_type, resource_id, resource_name, old_value, new_value)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
        """,
        (admin.id, admin.username, tenant_id, tenant_code, operation_type,
         resource_type, resource_id, resource_name,
         json.dumps(old_value, ensure_ascii=False) if old_value else None,
         json.dumps(new_value, ensure_ascii=False) if new_value else None)
    )


@router.get("", response_model=TenantListResponse, summary="获取租户列表")
async def list_tenants(
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    status: Optional[str] = Query(None, description="状态筛选"),
    keyword: Optional[str] = Query(None, description="关键词搜索"),
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """
    获取租户列表
    
    - **page**: 页码
    - **page_size**: 每页数量
    - **status**: 状态筛选（active, inactive, suspended）
    - **keyword**: 关键词搜索（匹配名称、编码、域名）
    """
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 构建查询条件
            conditions = []
            params = []
            
            if status:
                conditions.append("t.status = %s")
                params.append(status)
            
            if keyword:
                conditions.append("(t.name LIKE %s OR t.code LIKE %s OR t.domain LIKE %s)")
                params.extend([f"%{keyword}%"] * 3)
            
            where_clause = " AND ".join(conditions) if conditions else "1=1"
            
            # 查询总数
            cursor.execute(
                f"SELECT COUNT(*) as total FROM tenants t WHERE {where_clause}",
                params
            )
            total = cursor.fetchone()["total"]
            
            # 查询列表
            offset = (page - 1) * page_size
            cursor.execute(
                f"""
                SELECT t.*, 
                       (SELECT COUNT(*) FROM tenant_configs tc WHERE tc.tenant_id = t.id) as config_count
                FROM tenants t
                WHERE {where_clause}
                ORDER BY t.id DESC
                LIMIT %s OFFSET %s
                """,
                params + [page_size, offset]
            )
            rows = cursor.fetchall()
            
            items = [TenantResponse(**row) for row in rows]
            
            return TenantListResponse(
                items=items,
                total=total,
                page=page,
                page_size=page_size,
            )
    finally:
        conn.close()


@router.get("/{tenant_id}", response_model=TenantResponse, summary="获取租户详情")
async def get_tenant(
    tenant_id: int,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """获取租户详情"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            cursor.execute(
                """
                SELECT t.*, 
                       (SELECT COUNT(*) FROM tenant_configs tc WHERE tc.tenant_id = t.id) as config_count
                FROM tenants t
                WHERE t.id = %s
                """,
                (tenant_id,)
            )
            row = cursor.fetchone()
            
            if not row:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            return TenantResponse(**row)
    finally:
        conn.close()


@router.post("", response_model=TenantResponse, summary="创建租户")
async def create_tenant(
    data: TenantCreate,
    admin: AdminUserInfo = Depends(require_superadmin),
):
    """
    创建新租户
    
    需要超级管理员权限
    """
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 检查编码是否已存在
            cursor.execute("SELECT id FROM tenants WHERE code = %s", (data.code,))
            if cursor.fetchone():
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="租户编码已存在",
                )
            
            # 检查域名是否已存在
            cursor.execute("SELECT id FROM tenants WHERE domain = %s", (data.domain,))
            if cursor.fetchone():
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="域名已被使用",
                )
            
            # 创建租户
            cursor.execute(
                """
                INSERT INTO tenants 
                (code, name, display_name, domain, logo_url, favicon_url, 
                 contact_name, contact_phone, contact_email, industry, remarks, created_by)
                VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
                """,
                (data.code, data.name, data.display_name, data.domain,
                 data.logo_url, data.favicon_url, data.contact_name,
                 data.contact_phone, data.contact_email, data.industry,
                 data.remarks, admin.id)
            )
            tenant_id = cursor.lastrowid
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, data.code,
                "create", "tenant", tenant_id, data.name,
                new_value=data.model_dump()
            )
            
            conn.commit()
            
            # 返回创建的租户
            return await get_tenant(tenant_id, admin)
    finally:
        conn.close()


@router.put("/{tenant_id}", response_model=TenantResponse, summary="更新租户")
async def update_tenant(
    tenant_id: int,
    data: TenantUpdate,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """更新租户信息"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 获取原租户信息
            cursor.execute("SELECT * FROM tenants WHERE id = %s", (tenant_id,))
            old_tenant = cursor.fetchone()
            
            if not old_tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 如果更新域名，检查是否已被使用
            if data.domain and data.domain != old_tenant["domain"]:
                cursor.execute(
                    "SELECT id FROM tenants WHERE domain = %s AND id != %s",
                    (data.domain, tenant_id)
                )
                if cursor.fetchone():
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail="域名已被使用",
                    )
            
            # 构建更新语句
            update_fields = []
            update_values = []
            
            for field, value in data.model_dump(exclude_unset=True).items():
                if value is not None:
                    update_fields.append(f"{field} = %s")
                    update_values.append(value)
            
            if not update_fields:
                return await get_tenant(tenant_id, admin)
            
            update_fields.append("updated_by = %s")
            update_values.append(admin.id)
            update_values.append(tenant_id)
            
            cursor.execute(
                f"UPDATE tenants SET {', '.join(update_fields)} WHERE id = %s",
                update_values
            )
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, old_tenant["code"],
                "update", "tenant", tenant_id, old_tenant["name"],
                old_value=dict(old_tenant),
                new_value=data.model_dump(exclude_unset=True)
            )
            
            conn.commit()
            
            return await get_tenant(tenant_id, admin)
    finally:
        conn.close()


@router.delete("/{tenant_id}", response_model=ResponseModel, summary="删除租户")
async def delete_tenant(
    tenant_id: int,
    admin: AdminUserInfo = Depends(require_superadmin),
):
    """
    删除租户
    
    需要超级管理员权限
    警告：此操作将删除租户及其所有配置
    """
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 获取租户信息
            cursor.execute("SELECT * FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            
            if not tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "delete", "tenant", tenant_id, tenant["name"],
                old_value=dict(tenant)
            )
            
            # 删除租户（级联删除配置）
            cursor.execute("DELETE FROM tenants WHERE id = %s", (tenant_id,))
            
            conn.commit()
            
            return ResponseModel(message=f"租户 {tenant['name']} 已删除")
    finally:
        conn.close()


@router.post("/{tenant_id}/enable", response_model=ResponseModel, summary="启用租户")
async def enable_tenant(
    tenant_id: int,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """启用租户"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            cursor.execute(
                "UPDATE tenants SET status = 'active', updated_by = %s WHERE id = %s",
                (admin.id, tenant_id)
            )
            
            if cursor.rowcount == 0:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 获取租户信息并记录日志
            cursor.execute("SELECT code, name FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "enable", "tenant", tenant_id, tenant["name"]
            )
            
            conn.commit()
            
            return ResponseModel(message="租户已启用")
    finally:
        conn.close()


@router.post("/{tenant_id}/disable", response_model=ResponseModel, summary="禁用租户")
async def disable_tenant(
    tenant_id: int,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """禁用租户"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            cursor.execute(
                "UPDATE tenants SET status = 'inactive', updated_by = %s WHERE id = %s",
                (admin.id, tenant_id)
            )
            
            if cursor.rowcount == 0:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 获取租户信息并记录日志
            cursor.execute("SELECT code, name FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "disable", "tenant", tenant_id, tenant["name"]
            )
            
            conn.commit()
            
            return ResponseModel(message="租户已禁用")
    finally:
        conn.close()