/**
 * 数据管理 Mixin
 * 提供通用的数据获取、分页加载功能
 * 支持多种数据格式和灵活的配置
 */
export const dataManagerMixin = {
  data() {
    return {
      // 数据数组
      dataList: [],
      // 加载状态
      loading: false,
      // 分页参数
      pageNum: 1,
      pageSize: 8,
      hasMore: true,
      // 总数据量
      total: 0,
      // 当前查询参数
      currentParams: {},
    };
  },

  methods: {
    /**
     * 获取数据
     * @param {Object} options 配置选项
     * @param {boolean} options.isLoadMore 是否为加载更多
     * @param {Function} options.apiCall API调用函数
     * @param {Function} options.dataTransformer 数据转换函数
     * @param {Object} options.params 查询参数
     * @param {string} options.dataPath 数据路径，如 'data.list.rows'
     * @param {string} options.totalPath 总数路径，如 'data.total'
     * @param {Function} options.onSuccess 成功回调
     * @param {Function} options.onError 错误回调
     * @param {boolean} options.showLoading 是否显示loading
     * @param {boolean} options.showError 是否显示错误提示
     */
    async fetchData(options = {}) {
      const {
        isLoadMore = false,
        apiCall,
        dataTransformer,
        params = {},
        dataPath = "rows",
        totalPath = "total",
        onSuccess,
        onError,
        showLoading = true,
        showError = true,
      } = options;

      if (!apiCall) {
        console.error("fetchData: apiCall 是必需的");
        return;
      }

      // 设置loading状态
      if (showLoading) {
        this.loading = true;
      }

      try {
        console.log("isLoadMore", isLoadMore);
        // 更新页码
        if (isLoadMore) {
          this.pageNum++;
          console.log("this.pageNum", this.pageNum);
        } else {
          this.pageNum = 1;
        }

        // 构建请求参数
        const requestParams = {
          ...this.currentParams,
          ...params,
          pageNum: this.pageNum,
          pageSize: this.pageSize,
        };
        console.log("requestParams", requestParams);
        // 调用API
        const response = await apiCall(requestParams);

        console.log("API响应:", response);
        console.log("数据路径:", dataPath);
        console.log("总数路径:", totalPath);

        if (response.code === 200) {
          // 根据路径获取数据
          const dataArray = this.getNestedValue(response, dataPath) || [];
          const total = this.getNestedValue(response, totalPath) || 0;

          console.log("提取的数据数组:", dataArray);
          console.log("总数:", total);

          // 转换数据
          const newData = dataTransformer
            ? dataTransformer(dataArray)
            : dataArray;

          console.log("转换后的数据:", newData);

          // 更新数据
          if (isLoadMore) {
            this.dataList = [...this.dataList, ...newData];
          } else {
            this.dataList = newData;
          }

          console.log("更新后的 dataList:", this.dataList);

          // 更新状态
          this.total = total;

          this.currentParams = { ...requestParams };
          console.log("@@@hasMore", this.hasMore);
          this.hasMore =
            this.pageSize * this.currentParams.pageNum < this.total;

          console.log("this.hasMore", this.hasMore);
          console.log("this.total", this.total);
          console.log("this.pageSize", this.pageSize);
          console.log("this.currentParams.pageNum", this.currentParams.pageNum);

          // 成功回调
          if (onSuccess) {
            onSuccess(newData, response);
          }
        } else {
          const errorMsg = response.msg || "获取数据失败";
          if (showError) {
            uni.showToast({
              title: errorMsg,
              icon: "none",
            });
          }
          if (onError) {
            onError(errorMsg, response);
          }
        }
      } catch (error) {
        console.error("获取数据失败:", error);
        const errorMsg = "网络错误";
        if (showError) {
          uni.showToast({
            title: errorMsg,
            icon: "none",
          });
        }
        if (onError) {
          onError(errorMsg, error);
        }
      } finally {
        if (showLoading) {
          this.loading = false;
        }
      }
    },

    /**
     * 刷新数据
     * @param {Object} options 配置选项
     */
    refreshData(options = {}) {
      return this.fetchData({
        isLoadMore: false,
        ...options,
      });
    },

    /**
     * 加载更多数据
     * @param {Object} options 配置选项
     */
    loadMoreData(options = {}) {
      if (this.hasMore && !this.loading) {
        return this.fetchData({
          isLoadMore: true,
          ...options,
        });
      }
    },

    /**
     * 搜索数据
     * @param {Object} searchParams 搜索参数
     * @param {Object} options 配置选项
     */
    searchData(searchParams = {}, options = {}) {
      return this.fetchData({
        // isLoadMore: false,
        params: searchParams,
        ...options,
      });
    },

    /**
     * 重置分页状态
     */
    resetPagination() {
      this.pageNum = 1;
      this.hasMore = true; //可能就单页
      this.dataList = [];
      this.total = 0;
      this.currentParams = {};
    },

    /**
     * 获取嵌套对象的值
     * @param {Object} obj 对象
     * @param {string} path 路径，如 'data.list.rows'
     * @returns {*} 值
     */
    getNestedValue(obj, path) {
      if (!path) return obj;
      return path.split(".").reduce((current, key) => {
        return current && current[key] !== undefined ? current[key] : null;
      }, obj);
    },

    /**
     * 设置分页大小
     * @param {number} pageSize 分页大小
     */
    setPageSize(pageSize) {
      this.pageSize = pageSize;
      this.resetPagination();
    },

    /**
     * 获取当前数据状态
     * @returns {Object} 数据状态
     */
    getDataState() {
      return {
        dataList: this.dataList,
        loading: this.loading,
        pageNum: this.pageNum,
        pageSize: this.pageSize,
        hasMore: this.hasMore,
        total: this.total,
        currentParams: this.currentParams,
      };
    },
  },
};