/**
 * 分页管理工厂函数 (带winB_前缀)
 * @param {Object} options - 配置选项
 * @param {Function} options.fetchData - 获取数据的API函数
 * @param {Object} options.defaultParams - 默认查询参数
 * @param {string} options.mode - 分页模式：'loadMore' 或 'pager'
 * @param {number} options.pageSize - 每页数量
 * @param {boolean} options.autoLoad - 是否在创建时自动加载数据，默认为true
 * @returns {Object} Vue组件选项对象
 */
export function createPagination(options = {}) {
  const {
    fetchData,
    defaultParams = {},
    mode = "loadMore",
    pageSize = 10,
    autoLoad = true, // 新增参数，控制是否自动加载
  } = options;

  return {
    data() {
      return {
        // 基础状态
        winB_List: [],
        winB_Loading: false,
        winB_Error: null,

        // 分页参数
        winB_QueryParams: {
          pageNum: 1,
          pageSize,
          ...defaultParams,
        },

        // 分页信息
        winB_Pagination: {
          total: 0,
          currentPage: 1,
          pageSize,
          totalPages: 0,
          remainingItems: 0,
        },

        // 上拉加载相关
        winB_NoMore: false,
      };
    },

    computed: {
      winB_HasData() {
        return this.winB_List.length > 0;
      },
      winB_IsEmpty() {
        return !this.winB_Loading && this.winB_List.length === 0;
      },
      winB_CanLoadMore() {
        return mode === "loadMore" && !this.winB_NoMore && !this.winB_Loading;
      },
    },

    methods: {
      /**
       * 获取数据
       * @param {boolean} reset - 是否重置列表
       */
      async winB_GetList(reset = false) {
        if (this.winB_Loading) return;

        if (reset) {
          this.winB_List = [];
          this.winB_QueryParams.pageNum = 1;
          this.winB_NoMore = false;
        }

        this.winB_Loading = true;
        this.winB_Error = null;

        try {
          const response = await fetchData(this.winB_QueryParams);

          if (!response || response.code !== 200) {
            throw new Error(response?.message || "获取数据失败");
          }

          const { rows = [], total = 0 } = response;

          if (reset) {
            this.winB_List = rows;
          } else {
            this.winB_List = [...this.winB_List, ...rows];
          }

          // 更新分页信息
          this.winB_Pagination = {
            total,

            currentPage: this.winB_QueryParams.pageNum,
            pageSize,
            totalPages: Math.ceil(total / pageSize),
            remainingItems: Math.max(
              0,
              total - this.winB_QueryParams.pageNum * pageSize,
            ),
          };

          // 检查是否还有更多数据
          if (mode === "loadMore") {
            this.winB_NoMore =
              this.winB_QueryParams.pageNum * pageSize >= total;
            console.log(
              `noMore状态: ${this.winB_NoMore}, 当前页: ${this.winB_QueryParams.pageNum}, 每页: ${pageSize}, 总数: ${total}`,
            );
          }

          console.log(
            `获取数据成功: 第${this.winB_QueryParams.pageNum}页，共${rows.length}条`,
          );
        } catch (err) {
          console.error("获取数据失败:", err);
          this.winB_Error = err;

          // 显示错误提示
          if (typeof uni !== "undefined") {
            uni.showToast({
              title: "数据加载失败",
              icon: "none",
            });
          }
        } finally {
          this.winB_Loading = false;
        }
      },

      /**
       * 刷新数据
       */
      winB_Refresh() {
        this.winB_GetList(true);
      },

      /**
       * 加载下一页（上拉加载模式）
       */
      winB_LoadMore() {
        if (!this.winB_CanLoadMore) return 0;

        this.winB_QueryParams.pageNum++;
        this.winB_GetList();
      },

      /**
       * 跳转到指定页（分页器模式）
       * @param {number} page - 目标页码
       */
      winB_GoToPage(page) {
        if (
          page < 1 ||
          page > this.winB_Pagination.totalPages ||
          page === this.winB_QueryParams.pageNum
        ) {
          return;
        }

        this.winB_QueryParams.pageNum = page;
        this.winB_GetList(true);
      },

      /**
       * 重置分页状态
       */
      winB_Reset() {
        this.winB_List = [];
        this.winB_Loading = false;
        this.winB_Error = null;
        this.winB_NoMore = false;
        this.winB_QueryParams.pageNum = 1;
        this.winB_Pagination = {
          total: 0,
          currentPage: 1,
          pageSize,
          totalPages: 0,
        };
      },

      /**
       * 更新查询参数
       * @param {Object} newParams - 新的查询参数
       */
      winB_UpdateParams(newParams) {
        this.winB_QueryParams = {
          ...this.winB_QueryParams,
          ...newParams,
          pageNum: 1, // 重置页码
        };
        this.winB_Reset();
        this.winB_GetList();
      },

      /**
       * 格式化日期
       * @param {string} dateString - 日期字符串
       * @returns {string} 格式化后的日期
       */
      winB_FormatDate(dateString) {
        if (!dateString) return "未知";
        const date = new Date(dateString);
        return `${date.getFullYear()}.${String(date.getMonth() + 1).padStart(2, "0")}.${String(date.getDate()).padStart(2, "0")}`;
      },
    },

    created() {
      // 只有在 autoLoad 为 true 时才自动加载数据
      if (autoLoad) {
        this.winB_GetList();
      }
    },
  };
}