<template class="inline-block">
  <Select
    @dropdown-visible-change="handleFetch"
    v-bind="$attrs"
    @change="handleChange"
    :options="getOptions"
    :show-search="showSearch"
    @search="searchHandle"
    v-model:value="state"
  >
    <template #[item]="data" v-for="item in Object.keys($slots)">
      <slot :name="item" v-bind="data || {}"></slot>
    </template>
    <template #suffixIcon v-if="loading || showAdd">
      <LoadingOutlined spin v-if="loading" />
      <plus-outlined @click="emitAdd" v-if="showAdd" />
    </template>
    <template #notFoundContent v-if="loading">
      <span>
        <LoadingOutlined spin class="mr-1" />
        请等待数据加载完成...
      </span>
    </template>
  </Select>

</template>
<script lang="ts">
  import { defineComponent, PropType, ref, watchEffect, computed, unref, watch } from 'vue';
  import { Select } from 'ant-design-vue';
  import { isFunction } from '@/utils/is';
  import { useRuleFormItem } from '@/hooks/component/useFormItem';
  import { useAttrs } from '@/hooks/vben/useAttrs';
  import { get, omit } from 'lodash-es';
  import { LoadingOutlined, PlusOutlined } from '@ant-design/icons-vue';
  import { propTypes } from '@/utils/propTypes';

  type OptionsItem = { label: string; value: string; disabled?: boolean };

  export default defineComponent({
    name: 'ApiSelect',
    components: {
      Select,
      LoadingOutlined,
      PlusOutlined,
    },
    inheritAttrs: false,
    props: {
      value: [Array, Object, String, Number],
      numberToString: propTypes.bool,
      api: {
        type: Function as PropType<(arg?: Recordable) => Promise<OptionsItem[]>>,
        default: null,
      },
      // api params
      params: {
        type: Object as PropType<Recordable>,
        default: () => ({}),
      },
      searchParams: {
        type: Object as PropType<Recordable>,
        default: () => ({}),
      },
      showSearch: propTypes.bool.def(false),
      // support xxx.xxx.xx
      resultField: propTypes.string.def(''),
      labelField: propTypes.string.def('label'),
      valueField: propTypes.string.def('value'),
      immediate: propTypes.bool.def(true),
      alwaysLoad: propTypes.bool.def(false),
      showAdd: propTypes.bool.def(false),
    },
    emits: ['options-change', 'change', 'show-add'],
    setup(props, { emit }) {
      const options = ref<OptionsItem[]>([]);
      const loading = ref(false);
      const isFirstLoad = ref(true);
      const emitData = ref<any[]>([]);
      const attrs = useAttrs();
      const searchKeyword = ref('');
      const searchParamValues = computed(() => {
        const res: Recordable = { ...props.searchParams };
        Object.keys(props.searchParams)
          .filter(param => param !== 'useOr')
          .forEach(key => {
            if (!res[key]) {
              res[key] = searchKeyword.value;
            }
          });
        return res;
      });

      // Embedded in the form, just use the hook binding to perform form verification
      const [state, setState] = useRuleFormItem(props, 'value', 'change', emitData);

      const getOptions = computed(() => {
        const { labelField, valueField, numberToString } = props;

        return unref(options).reduce((prev, next: Recordable) => {
          if (next) {
            const value = next[valueField];
            prev.push({
              ...omit(next, [labelField, valueField]),
              label: next[labelField],
              value: numberToString ? `${value}` : value,
            });
          }
          return prev;
        }, [] as OptionsItem[]);
      });

      watchEffect(() => {
        props.immediate && !props.alwaysLoad && fetch();
      });

      watch(
        () => props.params,
        () => {
          console.log('watch:props.params', props.params);
          !unref(isFirstLoad) && fetch();
        },
        { deep: true },
      );
      watch(
        () => searchKeyword.value,
        () => {
          !unref(isFirstLoad) && fetch();
        },
        { deep: true },
      );

      async function fetch() {
        const api = props.api;
        if (!api || !isFunction(api)) return;
        options.value = [];
        try {
          loading.value = true;
          console.log('props.params', props.params);
          if (props.params) {
            delete props.params.apiSelectRefresh;
          }
          const res = await api({ ...props.params, ...unref(searchParamValues) });
          if (Array.isArray(res)) {
            options.value = res;
            emitChange();
            return;
          }
          if (props.resultField) {
            options.value = get(res, props.resultField) || [];
          }
          emitChange();
        } catch (error) {
          console.warn(error);
        } finally {
          loading.value = false;
          unref(attrs).mode == 'multiple' && !Array.isArray(unref(state)) && setState([]);
        }
      }

      async function handleFetch(visible) {
        if (visible) {
          if (props.alwaysLoad) {
            await fetch();
          } else if (!props.immediate && unref(isFirstLoad)) {
            await fetch();
            isFirstLoad.value = false;
          }
        }
      }

      function emitChange() {
        emit('options-change', unref(getOptions));
      }

      function handleChange(_, ...args) {
        // 需要还原为原始值
        const { valueField, labelField } = props;
        if (attrs?.labelInValue) {
          args.forEach((item: any) => {
            if (valueField !== 'value') {
              item[valueField] = item.value;
            }
            if (labelField !== 'label') {
              item[labelField] = item.label;
            }
          });
          Object.assign(_, args[0].option);
        }
        emitData.value = args;
      }

      function searchHandle(value) {
        searchKeyword.value = value;
        fetch();
      }

      const emitAdd = () => {
        emit('show-add');
      };
      return { state, attrs, getOptions, loading, handleFetch, handleChange, searchHandle, emitAdd };
    },
  });
</script>
