// 接口数据的获取
import { ref, watch, computed } from 'vue';

export function useFetchData() {
  // 分页信息
  const page = ref(1);
  const pageNum = ref(1);
  const pageSize = ref(20);
  const total = ref(0);
  watch(page, (nValue, oValue) => {
    if (nValue != oValue) {
      fetchData();
    }
  });
  watch(pageSize, (nValue, oValue) => {
    if (nValue != oValue) {
      fetchData();
    }
  });

  // 加载状态, 0: 加载完成; 1: 加载中; 2: 已全部加载; 3: 加载失败;
  const loadStatus = ref(0);

  const loading = computed(() => {
    return loadStatus.value == 1;
  });

  // 数据获取
  function fetchData(fetch) {
    loadStatus.value = 1;
    fetch(page.value, pageSize.value)
      .then((pageInfo) => {
        if (pageInfo) {
          page.value = pageInfo.page ? pageInfo.page : 1;
          pageNum.value = pageInfo.pageNum ? pageInfo.pageNum : 1;
          total.value = pageInfo.total ? pageInfo.total : 0;
        }

        loadStatus.value = 0;
      })
      .catch(() => {
        loadStatus.value = 3;
      })
      .finally(() => {
        loadStatus.value = 2;
      });
  }

  return { page, pageNum, pageSize, total, loadStatus, loading, fetchData };
}