<template>
    <div class="dict-selector">
        <el-select v-if="formType == 'select'" v-model="valueSync" :placeholder="placeholder" :clearable="clearable" :multiple="multiple" :disabled="disabled" @change="val => $emit('change', val)">
            <el-option v-for="dict in formattedList"
                        :key="dict.value" :label="$l(dict, 'label')" :value="dict.value"/>
        </el-select>
        <el-radio-group  v-if="formType == 'radio'" v-model="valueSync" :disabled="disabled">
            <el-radio v-for="dict in formattedList" :label="dict.value" :checked="valueSync === dict.value" :key="dict.value">{{$l(dict, 'label')}}</el-radio>
        </el-radio-group>
        <el-checkbox-group  v-if="formType == 'checkbox'" v-model="valueSync" :disabled="disabled">
            <el-checkbox v-for="dict in formattedList" :label="dict.value" :key="dict.value">{{$l(dict, 'label')}}</el-checkbox>
        </el-checkbox-group>
    </div>
</template>
<script>
const FORMATTERS = {
    "string": String,
    "bool": function(val){
        return [false, 'false', 0, "0"].indexOf(val) < 0
    },
    'number': Number,
    'array': function(val){
        return typeof val == 'string' ? val.split(',').filter(item => item && item !== '') : val
    }
}
export default {
    props:{
        placeholder: {
            type: String,
            default: '请选择'
        },
        type: String,
        value: [String, Number, Array, Boolean],
        multiple: Boolean,
        formType:{
            type: String,
            default: 'select'
        },
        formatter: {
            type: [Function, String],
            default: String
        },
        defaultable: Boolean, // 是否默认选择第一个
        disabled: Boolean,
        /**
         * 过滤字典项，用于只使用部分字典项的场景
         */
        filter: {
            type: Function,
            default: () => true
        },
        clearable: Boolean
    },
    data(){
        return {
            valueSync: this.multiple ? [] : null
        }
    },
    computed:{
        dictList(){
            return this.getList(this.type).filter(this.filter)
        },
        formattedList(){
            let arr = []
            this.dictList.forEach(item => {
                arr.push({
                    label: item.label,
                    labelEn: item.labelEn,
                    value: this.format(item.value),
                    cssClass: item.cssClass,
                    colorType: item.colorType
                })
            })
            return arr
        }
    },
    watch:{
        valueSync(val){
            this.$emit('input', val)
        },
        value(val){
            if(val != this.valueSync)this.setValueSync()
        },
        dictList(){
            this.setDefault()
        }
    },
    created(){
        this.setValueSync()
        this.setDefault()
    },
    methods:{
        format(val){
            if(val === null || val == undefined || val == '') return val
            let formatter = typeof this.formatter == 'function' ? this.formatter : FORMATTERS[this.formatter]
            if(!formatter){
                console.warn('格式器无效', this.formatter)
                return val
            }
            return formatter(val)
        },
        changeValue(val){
          this.valueSync = val
        },
        setValueSync(){
            if(this.value === null || this.value === undefined || this.value === ''){
                return this.valueSync = this.multiple ? [] : this.value   
            }
            if(this.multiple){
                let value = this.value || []
                if(typeof this.value == 'string'){
                    value = this.value.split(',').filter(item => item && item != '')
                }
                this.valueSync = value.map(item => this.format(item))
            }else{
                this.valueSync = this.format(this.value)
            }
        },
        getList(){
            return this.getDictDatas(this.type)
        },
        setDefault(){
            if(!this.defaultable) return
            if(this.dictList.length && (this.valueSync === null || this.valueSync == undefined || this.valueSync == '')){
                this.valueSync = this.multiple ? [] : this.formattedList[0].value
            }
        }
    }
}
</script>
<style scoped>
.dict-selector{
    display: inline-block;
}
</style>