Component({
    /**
     * 组件的属性列表
     */
    properties: {
        dataTree: {
            type: Array,
            value: []
        },
        treeListIndex: { // 当期树形列表的索引
            type: Number,
            value: 1
        },
        isOpenAll: { // 是否展开全部节点
            type: Boolean,
            value: false
        },
        showCheckBox: { // 是否显示选择框
            type: Boolean,
            value: true
        }
    },
    observers: {
        'dataTree': function (params) {
            this.setData({
                tree: this._initSourceData(params)
            })
        }
    },
    /**
     * 组件的初始数据
     */
    data: {
        tree: [],
        allChoiceIdList: [] // 所有选中的id数组
    },
    /**
     * 组件的方法列表
     */
    methods: {
        isOpen(e) {
            const open = 'tree[' + e.currentTarget.dataset.index + '].open'
            this.setData({
                [open]: !this.data.tree[e.currentTarget.dataset.index].open
            })
        },
        _initSourceData(nodes) {
            nodes.forEach(element => {
                if (element.checked === undefined) element.checked = 0
                element.open = this.properties.isOpenAll // 是否展开
                if (element.children && element.children.length > 0) element.children = this._initSourceData(element.children)
            })
            return nodes
        },
        /**
         * 选择节点
         * @param {*} e 
         */
        select(e) {
            this._initSourceData(this.data.tree);
            let item = e.currentTarget.dataset.item
            if(item.children && item.children.length>0){
                wx.showToast({
                    title: "请选择进度计划任务！",
                    icon: 'none',
                    duration: 600,
                    mask: true
                  });
                  return false;
            }
            item = this._handleClickItem(item)
            this.data.tree = this._updateTree(this.data.tree, item)
            this.setData({
                tree: this.data.tree
            })
            this.data.allChoiceIdList = this.getAllChoiceId(this.data.tree)
            this.triggerEvent('select', {
                item: item,
                idList: this.data.allChoiceIdList
            }, {
                bubbles: true,
                composed: true
            })
            this.triggerEvent('clickItem', {
                item: item
            }, {
                bubbles: true,
                composed: true
            })
        },
        // 选择冒泡事件
        handleSelect(e) {
            let parent = e.currentTarget.dataset.parent
            let currentTap = e.detail.item
            console.log('parent节点:', parent)
            console.log('currentTap节点:', currentTap)
            // 修正它的父节点
            parent.children = this._updateTree(parent.children, currentTap)
            const {
                half,
                all,
                none
            } = this.getChildState(parent.children)
            // console.log(`half:${half},all:${all},none:${none}`)
            if (half) parent.checked = -1
            if (all) parent.checked = 1
            if (none) parent.checked = 0
            // 修正整个tree
            this.data.tree = this._updateTree(this.data.tree, parent)
            this.setData({
                tree: this.data.tree
            })
            this.data.allChoiceIdList = this.getAllChoiceId(this.data.tree)
            this.triggerEvent('select', {
                item: parent,
                idList: this.data.allChoiceIdList
            }, {
                bubbles: true,
                composed: true
            })
        },
        /**
         * @method 处理点击选择
         * @param {Object} node 节点对象
         * @returns {Object} node 处理完毕的节点
         * @description 有子节点则全选中或全取消，当前为最底层单节点则选中或单取消
         */
        _handleClickItem(node) {
            switch (node.checked) {
                case 0:
                    node.checked = 1
                    if (node.children && node.children.length > 0) node.children = this._allChoice(node.children)
                    break;
                case 1:
                    node.checked = 0
                    if (node.children && node.children.length > 0) node.children = this._allCancel(node.children)
                    break;
                default:
                    node.checked = 1
                    if (node.children && node.children.length > 0) node.children = this._allChoice(node.children)
                    break;
            }
            return node
        },
        /**
         * @method 全选
         * @param {Array} nodes 节点数组
         * @returns {Array} nodes 处理完毕的节点数组
         */
        _allChoice(nodes) {
            if (nodes.length <= 0) return
            for (let i = 0; i < nodes.length; i++) {
                nodes[i].checked = 1
                if (nodes[i].children && nodes[i].children.length > 0) nodes[i].children = this._allChoice(nodes[i].children)
            }
            return nodes
        },
        /**
         * @method 全取消
         * @param {Array} nodes 节点数组
         * @returns {Array} nodes 处理完毕的节点数组
         */
        _allCancel(nodes) {
            if (nodes.length <= 0) return
            for (let i = 0; i < nodes.length; i++) {
                nodes[i].checked = 0
                if (nodes[i].children && nodes[i].children.length > 0) nodes[i].children = this._allCancel(nodes[i].children)
            }
            return nodes
        },
        /**
         * @method 更新tree
         * @param {Array} tree 节点树
         * @param {Object} newItem 需要替换新节点
         * @description 找到tree中目标进行替换
         */
        _updateTree(tree, newItem) {
            if (!tree || tree.length <= 0) return
            for (let i = 0; i < tree.length; i++) {
                if (tree[i].id === newItem.id) {
                    tree[i] = newItem
                    break
                } else {
                    if (tree[i].children && tree[i].children.length > 0) {
                        tree[i].children = this._updateTree(tree[i].children, newItem)
                    }
                }
            }
            return tree
        },
        /**
         * @method 获取子节点的状态
         * @param {Array} node 节点数组
         */
        getChildState(node) {
            let all = true;
            let none = true;
            for (let i = 0, j = node.length; i < j; i++) {
                const n = node[i];
                if (n.checked === 1 || n.checked === -1) {
                    none = none && false;
                }
                if (n.checked === 0 || n.checked === -1) {
                    all = all && false
                }
            }
            return {
                all,
                none,
                half: !all && !none
            };
        },
        // 获取所有选中的节点id
        getAllChoiceId(nodes, res = []) {
            for (let i = 0; i < nodes.length; i++) {
                if (nodes[i].checked === 1) {
                    var obj = {}
                    obj.planId = nodes[i].id
                    obj.planName = nodes[i].taskName
                    res.push(obj)
                }
                if (nodes[i].children && nodes[i].children.length > 0) this.getAllChoiceId(nodes[i].children, res)
            }
            return res
        }
    }
})