'use client';

import * as React from 'react';
import {
  createContext,
  useCallback,
  useContext,
  useRef,
  useState,
} from 'react';
import { useQueryClient } from '@tanstack/react-query';

import type {
  SystemConfig,
  UpdateSystemConfigRequest,
} from '@/lib/services/admin';
import services from '@/lib/services';
import { handleContextError } from '@/lib/utils/error-handling';

/** Admin 上下文状态接口 */
export interface AdminContextState {
  systemConfigs: SystemConfig[];
  systemConfigsLoading: boolean;
  systemConfigsError: Error | null;
  refetchSystemConfigs: (type?: 'system' | 'business') => Promise<void>;
  updateSystemConfig: (
    key: string,
    data: UpdateSystemConfigRequest,
  ) => Promise<void>;
}

const AdminContext = createContext<AdminContextState | null>(null);

/**
 * Admin Provider
 * 提供 admin 相关的数据状态管理
 *
 * @example
 * ```tsx
 * <AdminProvider>
 *   <div>内容</div>
 * </AdminProvider>
 * ```
 * @param {React.ReactNode} children - Admin Provider 的子元素
 */
export function AdminProvider({ children }: { children: React.ReactNode }) {
  const queryClient = useQueryClient();
  const [systemConfigs, setSystemConfigs] = useState<SystemConfig[]>([]);
  const [systemConfigsLoading, setSystemConfigsLoading] = useState(false);
  const [systemConfigsError, setSystemConfigsError] = useState<Error | null>(
    null,
  );

  const systemRequestIdRef = useRef(0);
  const lastConfigTypeRef = useRef<'system' | 'business' | undefined>(
    undefined,
  );

  /** 获取系统配置列表 */
  const refetchSystemConfigs = useCallback(
    async (type?: 'system' | 'business') => {
      lastConfigTypeRef.current = type;
      const requestId = ++systemRequestIdRef.current;

      try {
        setSystemConfigsLoading(true);
        setSystemConfigsError(null);
        const data = await services.adminSystemConfig.listSystemConfigs(type);

        if (requestId !== systemRequestIdRef.current) {
          return;
        }

        setSystemConfigs(data);
        setSystemConfigsLoading(false);
      } catch (error) {
        if (requestId !== systemRequestIdRef.current) {
          return;
        }

        const errorObject = handleContextError(error, '加载系统配置失败', {
          logError: true,
        });
        setSystemConfigsError(errorObject);
        setSystemConfigsLoading(false);
      }
    },
    [],
  );

  /** 更新系统配置 */
  const updateSystemConfig = useCallback(
    async (key: string, data: UpdateSystemConfigRequest) => {
      try {
        await services.adminSystemConfig.updateSystemConfig(key, data);
        await queryClient.invalidateQueries({ queryKey: ['public-config'] });
        await refetchSystemConfigs(lastConfigTypeRef.current);
      } catch (error) {
        handleContextError(error, '更新系统配置失败');
        throw error;
      }
    },
    [queryClient, refetchSystemConfigs],
  );

  const value: AdminContextState = {
    systemConfigs,
    systemConfigsLoading,
    systemConfigsError,
    refetchSystemConfigs,
    updateSystemConfig,
  };

  return (
    <AdminContext.Provider value={value}>{children}</AdminContext.Provider>
  );
}

/**
 * 使用 Admin 上下文
 *
 * @example
 * ```tsx
 * const { systemConfigs } = useAdmin()
 * ```
 * @returns {AdminContextState} Admin 上下文状态
 */
export function useAdmin() {
  const context = useContext(AdminContext);

  if (!context) {
    throw new Error('useAdmin 必须在 AdminProvider 内部使用');
  }

  return context;
}