<!--
 * @Descripttion: 动态表单渲染器
-->
<template>
	<el-skeleton v-if="renderLoading || Object.keys(form).length==0" animated />
	<el-form v-else ref="form" :model="form" :label-width="config.labelWidth" :label-position="config.labelPosition" v-loading="loading" element-loading-text="Loading...">
		<el-row :gutter="15">
			<template v-for="(item, index) in config.column" :key="index">
				<el-col :span="item.span || 24" v-if="!hideHandle(item)">
					<x-title  v-if="item.component=='title'"  :title="item.label"></x-title>
					<el-form-item v-else-if="item.component" :prop="item.name" :rules="rulesHandle(item)">
						<template #label>
							{{item.label}}
							<el-tooltip v-if="item.tips" :content="item.tips">
								<el-icon><el-icon-question-filled /></el-icon>
							</el-tooltip>
						</template>
						<x-item :item="item" v-model="form"></x-item>
					</el-form-item>
				</el-col>
			</template>
		</el-row>
	</el-form>
</template>

<script>
	import http from "@/utils/request"
	export default {
		props: {
			modelValue: { type: Object, default: () => {} },
			config: { type: Object, default: () => {} },
			loading: { type: Boolean, default: false },
		},
		components: {
		},
		data() {
			return {
				form: {},
				renderLoading: false
			}
		},
		watch:{
			modelValue(){
				if(this.hasConfig){
					this.deepMerge(this.form, this.modelValue)
				}
			},
			config(){
				this.render()
			},
			form:{
				handler(val){
					this.$emit("update:modelValue", val)
				},
				deep: true
			}
		},
		computed: {
			hasConfig(){
				return Object.keys(this.config).length>0
			},
			hasValue(){
				return Object.keys(this.modelValue).length>0
			}
		},
		created() {

		},
		mounted() {
			if(this.hasConfig){
				this.render()
			}
		},
		methods: {
			//构建form对象
			render() {
				this.config.column.forEach((item) => {
					item.options = item.options?item.options:[];
					if(item.component == 'checkbox'){
						if(item.name){
							const value = {}
							item.options.items.forEach((option) => {
								 value[option.name] = option.value
							})
							this.form[item.name] = value
						}else{
							item.options.items.forEach((option) => {
								 this.form[option.name] = option.value
							})
						}
					}else{
						this.form[item.name] = item.value
					}
				})


				if(this.hasValue){
					this.form = this.deepMerge(this.form, this.modelValue)
				}
				this.getData()
			},
			//处理远程选项数据
			getData() {
				this.renderLoading = true
				var remoteData = []
				this.config.column.forEach((item) => {
					if(item.options && item.options.remote){
						var req = http.get(item.options.remote.api, item.options.remote.data).then(res=>{
							item.options.items = res.data
						})
						remoteData.push(req)
					}
				})
				Promise.all(remoteData).then(()=>{
					this.renderLoading = false
				})
			},
			//合并深结构对象
			deepMerge(obj1, obj2) {
				let key;
				for (key in obj2) {
					obj1[key] = obj1[key] && obj1[key].toString() === "[object Object]" && (obj2[key] && obj2[key].toString() === "[object Object]") ? this.deepMerge(obj1[key], obj2[key]) : (obj1[key] = obj2[key])
				}
				return obj1
				//return JSON.parse(JSON.stringify(obj1))
			},
			//数据验证
			validate(valid, obj){
				return this.$refs.form.validate(valid, obj)
			},
			scrollToField(prop){
				return this.$refs.form.scrollToField(prop)
			},
			resetFields(){
				return this.$refs.form.resetFields()
			},
			//提交
			submit(){
				this.$emit("submit", this.form)
			},
			//处理动态必填
			rulesHandle(item){
				if(item.requiredHandle){
					const exp = eval(item.requiredHandle.replace(/\$/g,"this.form"))
					var requiredRule = item.rules.find(t => 'required' in t)
					requiredRule.required = exp
				}
				return item.rules
			},

			//处理动态隐藏
			hideHandle(item){
				if(item.hideHandle){
					const exp = eval(item.hideHandle.replace(/\$/g,"this.form"))
					return exp
				}
				return false
			},
		}
	}
</script>

<style>
</style>
