<script lang="ts">
    import type { PropType } from 'vue'
    import { computed, defineComponent, ref, unref, watch, watchEffect } from 'vue'
    import { Select } from 'ant-design-vue'
    import { isFunction } from '/@/utils/is'
    import { useRuleFormItem } from '/@/hooks/component/useFormItem'
    import { useAttrs } from '/@/hooks/core/useAttrs'
    import { get, omit } from 'lodash-es'
    import { LoadingOutlined } from '@ant-design/icons-vue'
    import { useI18n } from '/@/hooks/web/useI18n'
    import { propTypes } from '/@/utils/propTypes'

    interface OptionsItem {
        label: string
        value: string
        disabled?: boolean
    }
    export default defineComponent({
        name: 'ApiSelect',
        components: {
            Select,
            LoadingOutlined,
        },
        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: () => ({}),
            },
            // 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),
        },
        emits: ['options-change', 'change', 'update:value'],
        setup(props, { emit }) {
            const options = ref<OptionsItem[]>([])
            const loading = ref(false)
            const isFirstLoad = ref(true)
            const emitData = ref<any[]>([])
            const attrs = useAttrs()
            const { t } = useI18n()
            // Embedded in the form, just use the hook binding to perform form verification
            const [state] = 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(
                () => state.value,
                (v) => {
                    emit('update:value', v)
                },
            )
            watch(
                () => props.params,
                () => {
                    !unref(isFirstLoad) && fetch()
                },
                { deep: true },
            )
            async function fetch() {
                const api = props.api
                if (!api || !isFunction(api)) return
                options.value = []
                try {
                    loading.value = true
                    const res = await api(props.params)
                    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
                }
            }
            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) {
                emitData.value = args
            }
            return { state, attrs, getOptions, loading, t, handleFetch, handleChange }
        },
    })
</script>

<template>
    <Select
        @dropdown-visible-change="handleFetch"
        v-bind="$attrs"
        @change="handleChange"
        :options="getOptions"
        v-model:value="state"
    >
        <template #[item]="data" v-for="item in Object.keys($slots)">
            <slot :name="item" v-bind="data || {}"></slot>
        </template>
        <template #suffixIcon v-if="loading">
            <LoadingOutlined spin />
        </template>
        <template #notFoundContent v-if="loading">
            <span>
                <LoadingOutlined spin class="mr-1" />
                {{ t('component.form.apiSelectNotFound') }}
            </span>
        </template>
    </Select>
</template>
