<template>
    <div class="dropdown-list-container">
        <i-select v-if="!hasChildren"
        class='dropdown-list'
        :transfer="true"
        v-model="currentVal"
        :disabled="disabled || readonly"
        :clearable="true"
        :filterable="filterable"
        @on-open-change="onClick"
        :placeholder="placeholder?placeholder:$t('components.dropdownlist.placeholder')">
        <i-option v-for="(item, index) in items" :key="index" :disabled="item.disabled" :class="item.class" :value="item.value">{{item.text}}</i-option>
        </i-select>
        <ibiz-select-tree v-if="hasChildren" class="tree-dropdown-list" :disabled="disabled" :NodesData="items" v-model="currentVal" :multiple="false"></ibiz-select-tree>
    </div>
</template>

<script lang="ts">
import { Vue, Component, Watch, Prop, Model } from 'vue-property-decorator';
import { CodeListService } from "ibiz-service";
import { Util, LogUtil } from 'ibiz-core';
import { Subject, Subscription } from 'rxjs';

@Component({
})
export default class DropDownList extends Vue {
    /**
     * 代码表服务对象
     *
     * @type {CodeListService}
     * @memberof DropDownList
     */  
    public codeListService:CodeListService = new CodeListService({ $store: this.$store });

    /**
     * 额外参数
     *
     * @type {*}
     * @memberof DropDownList
     */
    public otherParam:any;

    /**
     * 查询参数
     * @type {*}
     * @memberof DropDownList
     */
    public queryParam:any;

    /**
     * 是否有子集
     * @type {boolean}
     * @memberof DropDownList
     */
    public hasChildren:boolean = false;

    /**
     * 当前选中值
     * @type {any}
     * @memberof DropDownList
     */
    @Model('change') readonly itemValue!: any;

    /**
     * 监控值变化，根据属性类型强制转换
     *
     * @memberof DropDownList
     */
    @Watch('itemValue',{
        immediate: true
    })
    public valueWatch() {
        try {
            this.readyValue();
            // 代码表集合中不存在改选项，重新准备集合
            if ((this.value == 0 || this.value) && !this.items.find((item: any) => Object.is(this.value, item.value))) {
                this.loadData();
            }
        } catch (error) {
            LogUtil.log(this.$t('components.dropdownlist.valueerror'));
        }
    }

    /**
     * 代码表标识
     *
     * @type {string}
     * @memberof DropDownList
     */
    @Prop() public tag?: string;

    /**
     * 代码表类型
     *
     * @type {string}
     * @memberof DropDownList
     */
    @Prop() public codelistType?: string;

    /**
     * 代码表
     *
     * @type {string}
     * @memberof DropDownList
     */    
    @Prop() public codeList!: any;

    /**
     * 传入表单数据
     *
     * @type {*}
     * @memberof DropDownList
     */
    @Prop() public data?: any;

    /**
     * 表单状态对象
     *
     * @type {Subject<any>}
     * @memberof AppEmbedPicker
     */
    @Prop() public formState!: Subject<any>

    /**
     * 订阅对象
     *
     * @protected
     * @type {(Subscription | undefined)}
     * @memberof SelectType
     */
    protected formStateEvent: Subscription | undefined;

  /**
     * 监听表单数据
     *
     * @memberof DropDownList
     */    
    @Watch('data',{ deep: true })
    onDataChange(newVal: any, val: any){
        if(newVal){
            
        }
    }

    /**
     * 局部上下文导航参数
     *
     * @type {*}
     * @memberof DropDownList
     */
    @Prop() public localContext!:any;
    
    /**
     * 局部导航参数
     *
     * @type {*}
     * @memberof DropDownList
     */
    @Prop() public localParam!:any;

    /**
     * 视图上下文
     *
     * @type {*}
     * @memberof AppAutocomplete
     */
    @Prop() public context!: any;

    /**
     * 视图参数
     *
     * @type {*}
     * @memberof AppFormDRUIPart
     */
    @Prop() public viewparams!: any;

    /**
     * 是否禁用
     * @type {any}
     * @memberof DropDownList
     * 
     */
    @Prop() public disabled?: any;

	/**
	 * 只读模式
	 * 
	 * @type {boolean}
	 */
	@Prop({default: false}) public readonly?: boolean;

    /**
     * 是否支持过滤
     * @type {boolean}
     * @memberof DropDownList
     */
    public filterable: boolean = true;

    /**
     * 下拉选提示内容
     * @type {string}
     * @memberof DropDownList
     */
    @Prop() public placeholder?: string;

    /**
     * 属性类型
     *
     * @type {'string' | 'number'}
     * @memberof DropDownList
     */
    @Prop({ default: 'string' })
    public valueType!: 'string' | 'number';

     /**
     * 选择实际值
     *
     * @type {*}
     * @memberof DropDownList
     */
    public value: any = null;

    /**
     * 计算属性(当前值)
     * @type {any}
     * @memberof DropDownList
     */
    set currentVal(val: any) {
        if(this.hasChildren && val){
            let tempVal:any = JSON.parse(val);
            val = tempVal.length >0?tempVal[0].value:null;
        }
        const type: string = this.$util.typeOf(val);
        val = Object.is(type, 'null') || Object.is(type, 'undefined') || Object.is(val, '') ? null : val;
        this.$emit('change', val);
    }

    /**
     * 获取值对象
     *
     * @memberof DropDownList
     */
    get currentVal() {
        if(this.hasChildren && this.itemValue){
            let list:Array<any> = [];
            this.getItemList(list,this.items);
            let result:any = list.find((item:any) =>{
                return item.value == this.itemValue;
            })
            return !result ? null : JSON.stringify([result]);
        }
        return this.value;
    }

    /**
     * 获取代码表列表
     *
     * @memberof DropDownList
     */
    public getItemList(list:Array<any>,items:Array<any>){
        if(items && items.length >0){
            items.forEach((item:any) =>{
                if(item.children){
                    this.getItemList(list,item.children);
                }
                list.push(item);
            })
        }
    }

    /**
     * 代码表
     *
     * @type {any[]}
     * @memberof DropDownList
     */
    public items: any[] = [];

    /**
     * 公共参数处理
     *
     * @param {*} arg
     * @returns
     * @memberof DropDownList
     */
    public handlePublicParams(arg: any) {
        // 合并表单参数
        arg.param = this.viewparams ? JSON.parse(JSON.stringify(this.viewparams)) : {};
        arg.context = this.context ? JSON.parse(JSON.stringify(this.context)) : {};
        // 附加参数处理
        if (this.localContext && Object.keys(this.localContext).length >0) {
            let _context = this.$util.computedNavData(this.data,arg.context,arg.param,this.localContext);
            Object.assign(arg.context,_context);
        }
        if (this.localParam && Object.keys(this.localParam).length >0) {
            let _param = this.$util.computedNavData(this.data,arg.context,arg.param,this.localParam);
            Object.assign(arg.param,_param);
        }
    }

    /**
     * vue  生命周期
     *
     * @memberof DropDownList
     */
    public created() {
        if(this.formState) {
            this.formStateEvent = this.formState.subscribe(({ type, data }) => {
                if (Object.is('load', type)) {
                    this.loadData();
                    this.readyValue();
                }
            });
        }
        if(this.itemValue){
            this.loadData();
        }
        this.readyValue();
    }

    /**
     * 加载数据
     *
     * @memberof DropDownList
     */
    public loadData(){
        if(this.tag && this.codelistType) {
            let data: any = {};
            this.handlePublicParams(data);
            // 参数处理
            let context = data.context;
            let viewparam = data.param;
            this.codeListService.getDataItems({ tag: this.tag, type: this.codelistType,data: this.codeList,context:context,viewparam:viewparam}).then((codelistItems: Array<any>) => {
                this.formatCodeList(codelistItems);
            }).catch((error: any) => {
                LogUtil.log(`----${this.tag}----${this.$t('app.commonwords.codenotexist')}`);
            })
        }
    }

    /**
     * 准备值
     *
     * @memberof DropDownList
     */
    public readyValue() {
        if (this.itemValue == null) {
            this.value = null;
            return;
        }
        if (this.$util.typeOf(this.itemValue) === this.valueType) {
            this.value = this.itemValue;
        } else if (this.valueType === 'number') {
            if (this.itemValue.indexOf('.') === -1) {
                this.value = parseInt(this.itemValue);
            } else {
                this.value = parseFloat(this.itemValue);
            }
        } else {
            this.value = this.itemValue.toString();
        }
    }
    
    /**
     * 下拉点击事件
     *
     * @param {*} $event
     * @memberof DropDownList
     */
    public onClick($event:any){
        if($event){
            this.loadData();
        }
    }

    /**
     * 代码表类型和属性匹配
     * 
     * @param {*} items
     * @memberof DropDownList
     */
    public formatCodeList(items: Array<any>){
        let matching: boolean = false;
        this.items = [];
        try{
            items.forEach((item: any)=>{
                const type = this.$util.typeOf(item.value);
                if(type != this.valueType){
                    matching = true;
                    if(type === 'number'){
                        item.value = item.value.toString();
                    }else{
                        if(type == "null") {
                            this.valueType == "number" ? item.value = 0 : item.value = '';
                        }else if(item.value.indexOf('.') == -1){
                            item.value = parseInt(item.value);
                        }else{
                            item.value = parseFloat(item.value);
                        }
                    }
                }
                this.items.push(item);
            });
            if(matching){
                LogUtil.warn(`${ this.tag }${this.$t('app.commonwords.codelistwarn')}`);
            }
            
        }catch(error){
            LogUtil.warn(this.$t('app.commonwords.codelistwarn'));
        }
        this.handleLevelCodeList(Util.deepCopy(this.items));
    }

    /**
     * 处理层级代码表
     * 
     * @param {*} items
     * @memberof DropDownList
     */
    public handleLevelCodeList(items: Array<any>){
        if(items && items.length >0){
            this.hasChildren = items.some((item:any) =>{
                return item.pvalue;
            })
            if(this.hasChildren){
                let list:Array<any> = [];
                items.forEach((codeItem:any) =>{
                    if(!codeItem.pvalue){
                        let valueField:string = codeItem.value;
                        this.setChildCodeItems(valueField,items,codeItem);
                        list.push(codeItem);
                    }
                })
                this.items = list;
            }
        }
    }

    /**
     * 计算子类代码表
     * 
     * @param {*} items
     * @memberof DropDownList
     */
    public setChildCodeItems(pValue:string,result:Array<any>,codeItem:any){
        result.forEach((item:any) =>{
            if(item.pvalue == pValue){
                let valueField:string = item.value;
                this.setChildCodeItems(valueField,result,item);
                if(!codeItem.children){
                    codeItem.children = [];
                }
                codeItem.children.push(item);
            }
        })
    }

    /**
     * vue 生命周期
     *
     * @memberof DropDownList
     */
    public destroyed() {
        if (this.formStateEvent) {
            this.formStateEvent.unsubscribe();
        }
    }
}
</script>

<style lang='less'>
@import './dropdown-list.less';
</style>