/**
 * 煤种数据管理组合式函数
 * 提供煤种数据的获取、缓存、转换等功能
 */
import { ref, computed, watch } from 'vue';
import { getCoalFieldList } from '@/api/basicInformation/coalQualityMaintenance';
import { ElMessage } from 'element-plus';

// 全局煤种数据缓存
const coalData = ref([]);
const isLoading = ref(false);
const isLoaded = ref(false);

export function useCoalData() {
  
  // 获取煤种数据
  const getCoalData = async (forceRefresh = false) => {
    if (isLoaded.value && !forceRefresh) {
      return coalData.value;
    }

    if (isLoading.value) {
      // 如果正在加载，等待加载完成
      return new Promise((resolve) => {
        const unwatch = watch(isLoading, (loading) => {
          if (!loading) {
            unwatch();
            resolve(coalData.value);
          }
        });
      });
    }

    isLoading.value = true;
    try {
      const res = await getCoalFieldList();
      if (res.code === 200) {
        coalData.value = res.data;
        isLoaded.value = true;
        return coalData.value;
      } else {
        ElMessage.error('获取煤种数据失败');
        return [];
      }
    } catch (error) {
      ElMessage.error('获取煤种数据失败');
      console.error('煤种数据获取错误:', error);
      return [];
    } finally {
      isLoading.value = false;
    }
  };

  // 根据ID获取煤种名称
  const getCoalNameById = (id) => {
    if (!id || coalData.value.length === 0) return id;
    const coal = coalData.value.find(item => item.id == id);
    return coal ? coal.fieldName : id;
  };

  // 根据名称获取煤种ID
  const getCoalIdByName = (name) => {
    if (!name || coalData.value.length === 0) return '';
    const coal = coalData.value.find(item => item.fieldName === name);
    return coal ? coal.id : '';
  };

  // 生成下拉选项
  const coalOptions = computed(() => {
    return coalData.value.map(item => ({
      label: item.fieldName,
      value: item.fieldName,
      key: item.id
    }));
  });

  // 生成key-value映射
  const coalMap = computed(() => {
    const map = {};
    coalData.value.forEach(item => {
      map[item.id] = item.fieldName;
    });
    return map;
  });

  return {
    coalData: computed(() => coalData.value),
    coalOptions,
    coalMap,
    isLoading: computed(() => isLoading.value),
    isLoaded: computed(() => isLoaded.value),
    getCoalData,
    getCoalNameById,
    getCoalIdByName
  };
}