<template class="inline-block">
  <a-select
    @dropdown-visible-change="handleFetch"
    v-bind="attrs"
    @change="handleChange"
    :options="getOptions"
    :show-search="showSearch"
    v-model:value="state"
  >
    <template #[item]="data" v-for="item in Object.keys($slots)">
      <slot :name="item" v-bind="data || {}"></slot>
    </template>
    <template #suffixIcon v-if="loading">
      <Icon icon="ant-design:loading-outlined" spin />
    </template>
    <template #notFoundContent v-if="loading">
      <span>
        <Icon icon="ant-design:loading-outlined" spin class="mr-1" />
        <% if (enableTranslation) { %>{{ t('component.form.apiSelectNotFound') }}<% } else { %>t$t('component.form.apiSelectNotFound')$t$<% } %>
      </span>
    </template>
  </a-select>

</template>
<script lang="ts" setup>
  import type { SelectValue } from 'ant-design-vue/es/select';
  import type { Recordable } from '#/utils';
  import { useRuleFormItem } from '@/hooks/component/useFormItem';
<%_ if (enableTranslation) { _%>
  import { useI18n } from '@/hooks/web/useI18nOut';
<%_ } _%>

  type OptionsItem = { label: string; value: string; disabled?: boolean; [name: string]: any };

  defineOptions({ name: 'ApiSelect', inheritAttrs: false });

  const props = defineProps({
    value: { type: [Array, Object, String, Number] as PropType<SelectValue> },
    api: {
      type: Function as PropType<(arg?: any) => Promise<any[]>>,
      default: null,
    },
    // api params
    params: {
      type: Object,
      default: () => ({}),
    },
    searchParams: {
      type: Object,
      default: () => ({}),
    },
    showSearch: {
      type: Boolean,
      default: false,
    },
    // support xxx.xxx.xx
    resultField: {
      type: String,
      default: '',
    },
    immediate: {
      type: Boolean,
      default: true,
    },
    alwaysLoad: {
      type: Boolean,
      default: false,
    },
    showAdd: {
      type: Boolean,
      default: false,
    },
    options: {
      type: Array,
      default: [],
    },
  });

  const emit = defineEmits(['options-change', 'change', 'update:value', 'show-add']);

  const optionsRef = ref<any[]>([]);

  const loading = ref(false);
  // 首次是否加载过了
  const isFirstLoaded = ref(false);
  const emitData = ref<any[]>([]);
<%_ if (enableTranslation) { _%>
  const { t } = useI18n();
<%_ } _%>
  const attrs = useAttrs();

  if (props.showSearch) {
    attrs['onSearch'] = searchHandle;
  }

  const [state, setState] = useRuleFormItem(props, 'value', 'change', emitData);

  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;
  });

  const getOptions = computed(() => {
    const { fieldNames } = attrs;
    const labelField = fieldNames?.label || 'label';
    const valueField = fieldNames?.value || 'value';
    let data = unref(optionsRef).reduce((prev, next: any) => {
      if (next) {
        const value = _get(next, valueField);
        prev.push({
          ...next,
          originOption: next,
          label: _get(next, labelField),
          value: value,
        });
      }
      return prev;
    }, [] as OptionsItem[]);
    return data.length > 0 ? data : props.options;
  });

  watch(
    () => state.value,
    (v) => {
      emit('update:value', v);
    },
  );

  watch(
    () => props.params,
    (value, oldValue) => {
      if (_isEqual(value, oldValue)) return;
      fetch();
    },
    { deep: true, immediate: props.immediate },
  );

  watch(
    () => searchKeyword.value,
    () => {
      !unref(isFirstLoaded) && fetch();
    },
    { deep: true },
  );

  async function fetch() {
    const api = props.api;
    if (!api || !_isFunction(api) || loading.value) return;
    optionsRef.value = [];
    try {
      loading.value = true;
      const res = await api({ ...props.params, ...unref(searchParamValues) });
      isFirstLoaded.value = true;
      if (Array.isArray(res)) {
        optionsRef.value = res;
        emitChange();
        return;
      }
      if (props.resultField) {
        optionsRef.value = _get(res, props.resultField) || [];
      }
      emitChange();
    } catch (error) {
      console.warn(error);
      // reset status
      isFirstLoaded.value = false;
    } finally {
      loading.value = false;
      unref(attrs).mode == 'multiple' && !Array.isArray(unref(state)) && setState([]);
      initValue();
    }
  }

  async function handleFetch(visible: boolean) {
    if (visible) {
      if (props.alwaysLoad) {
        await fetch();
      } else if (!props.immediate && !unref(isFirstLoaded)) {
        await fetch();
      }
    }
  }

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

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

  function handleChange(_, ...args) {
    if (unref(attrs).labelInValue) {
      if (_isArray(_)) {
        _.forEach(item => {
          Object.assign(item, item.option);
        });
      } else {
        Object.assign(_, _.option);
      }
    }
    emitData.value = args;
  }

function initValue() {
  let value = props.value;
  if (value && typeof value === 'string' && value !== 'null' && value !== 'undefined') {
    state.value = value.split(',');
  }
  if (unref(attrs).labelInValue) {
    const { valueField, labelField } = props;
    if (_isArray(value)) {
      value.forEach(item => {
        item.value = item[valueField];
        item.label = item[labelField];
      });
    } else if (value) {
      value['value'] = value[valueField];
      value['label'] = value[labelField];
    }
  }
}
</script>
