/**
 * usePagination - 通用分页 Hook
 *
 * 封装分页逻辑，支持初始加载、加载更多、重置等功能
 *
 * @example
 * const {
 *   data: comments,
 *   loading,
 *   loadingMore,
 *   hasMore,
 *   totalCount,
 *   loadMore,
 *   setData,
 *   setTotalCount,
 * } = usePagination<Comment>(loadCommentsFunction, { pageSize: 5 });
 */

import { useState, useCallback, useEffect } from 'react';
import type {
  LoadFunction,
  PaginationLoadResult,
  UsePaginationOptions,
  UsePaginationResult,
} from '@/types/pagination';

/**
 * usePagination Hook
 * @template T 数据项类型
 * @param loadFunction 加载函数，接收 (page, append) 参数
 * @param options 配置选项
 * @returns 分页状态和操作方法
 */
export function usePagination<T>(
  loadFunction: LoadFunction<T>,
  options: UsePaginationOptions = {}
): UsePaginationResult<T> {
  const { pageSize = 10, autoLoad = true } = options;

  // 状态管理
  const [data, setData] = useState<T[]>([]);
  const [loading, setLoading] = useState(false);
  const [loadingMore, setLoadingMore] = useState(false);
  const [currentPage, setCurrentPage] = useState(1);
  const [totalCount, setTotalCount] = useState(0);
  const [hasMore, setHasMore] = useState(false);

  /**
   * 加载数据
   * @param page 页码
   * @param append 是否追加（true: 追加，false: 替换）
   */
  const loadData = useCallback(
    async (page: number, append: boolean = false) => {
      // 设置加载状态
      if (append) {
        setLoadingMore(true);
      } else {
        setLoading(true);
      }

      try {
        const result: PaginationLoadResult<T> = await loadFunction(page, append);

        // 更新数据
        if (append) {
          setData((prevData) => [...prevData, ...(result.data || [])]);
        } else {
          setData(result.data || []);
        }

        // 更新分页信息
        const total = result.pagination?.total || result.data?.length || 0;
        setTotalCount(total);

        // 计算是否还有更多数据
        const currentTotal = append
          ? data.length + (result.data?.length || 0)
          : result.data?.length || 0;
        setHasMore(currentTotal < total);
      } catch (error) {
        console.error('[usePagination] 加载数据失败:', error);
        throw error;
      } finally {
        if (append) {
          setLoadingMore(false);
        } else {
          setLoading(false);
        }
      }
    },
    [loadFunction, data.length]
  );

  /**
   * 加载更多数据
   */
  const loadMore = useCallback(async () => {
    if (loadingMore || !hasMore) return;

    const nextPage = currentPage + 1;
    await loadData(nextPage, true);
    setCurrentPage(nextPage);
  }, [currentPage, loadData, loadingMore, hasMore]);

  /**
   * 重置到第一页
   */
  const reset = useCallback(() => {
    setCurrentPage(1);
    setData([]);
    setTotalCount(0);
    setHasMore(false);
    loadData(1, false);
  }, [loadData]);

  // 自动加载第一页
  useEffect(() => {
    if (autoLoad) {
      loadData(1, false);
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [autoLoad]);

  return {
    data,
    loading,
    loadingMore,
    currentPage,
    hasMore,
    totalCount,
    loadMore,
    reset,
    setData,
    setTotalCount,
  };
}