'use strict';

/**
 *
 *
 * @author Mai
 * @date
 * @version
 */

const itemsPre = 'id_';

class baseTree {
    /**
     * 构造函数
     */
    constructor (ctx, setting) {
        this.ctx = ctx;
        // 无索引
        this.datas = [];
        // 以key为索引
        this.items = {};
        // 以排序为索引
        this.nodes = [];
        // 根节点
        this.children = [];
        // 树设置
        this.setting = setting;
    }

    /**
     * 根据id获取树结构节点数据
     * @param {Number} id
     * @returns {Object}
     */
    getItems (id) {
        return this.items[itemsPre + id];
    };
    /**
     * 查找node的parent
     * @param {Object} node
     * @returns {Object}
     */
    getParent (node) {
        return this.getItems(node[this.setting.pid]);
    };
    /**
     * 查询node的已下载子节点
     * @param {Object} node
     * @returns {Array}
     */
    getChildren (node) {
        const setting = this.setting;
        const pid = node ? node[setting.id] : setting.rootId;
        const children = this.datas.filter(function (x) {
            return x[setting.pid] === pid;
        });
        children.sort(function (a, b) {
            return a.order - b.order;
        });
        return children;
    };
    /**
     * 获取节点的 index
     * @param node
     * @returns {number}
     */
    getNodeSerialNo(node) {
        return this.nodes.indexOf(node);
    }

    /**
     * 树结构根据显示排序
     */
    sortTreeNode (isResort) {
        const self = this;
        const addSortNodes = function (nodes) {
            if (!nodes) { return }
            for (let i = 0; i < nodes.length; i++) {
                self.nodes.push(nodes[i]);
                nodes[i].index = self.nodes.length - 1;
                if (!isResort) {
                    nodes[i].children = self.getChildren(nodes[i]);
                } else {
                    nodes[i].children.sort(function (a, b) {
                        return a.order - b.order;
                    })
                }
                addSortNodes(nodes[i].children);
            }
        };
        this.nodes = [];
        if (!isResort) {
            this.children = this.getChildren();
        } else {
            this.children.sort(function (a, b) {
                return a.order - b.order;
            })
        }
        addSortNodes(this.children);
    }
    /**
     * 加载数据(初始化), 并给数据添加部分树结构必须数据
     * @param datas
     */
    loadDatas (datas) {
        // 清空旧数据
        this.items = {};
        this.nodes = [];
        this.datas = [];
        this.children = [];
        // 加载全部数据
        datas.sort(function (a, b) {
            return a.level - b.level;
        });
        for (const data of datas) {
            const keyName = itemsPre + data[this.setting.id];
            if (!this.items[keyName]) {
                const item = JSON.parse(JSON.stringify(data));
                item.children = [];
                item.expanded = true;
                item.visible = true;
                this.items[keyName] = item;
                this.datas.push(item);
                if (item[this.setting.pid] === this.setting.rootId) {
                    this.children.push(item);
                } else {
                    const parent = this.getParent(item);
                    if (parent) {
                        parent.children.push(item);
                    }
                }
            }
        }
        this.children.sort(function (a, b) {
            return a.order - b.order;
        });
        this.sortTreeNode(true);
    }

    /**
     * 递归方式 查询node的已下载的全部后代 (兼容full_path不存在的情况)
     * @param node
     * @returns {*}
     * @private
     */
    _recursiveGetPosterity (node) {
        let posterity = node.children;
        for (const c of node.children) {
            posterity = posterity.concat(this._recursiveGetPosterity(c));
        }
        return posterity;
    };
    /**
     * 查询node的已下载的全部后代
     * @param {Object} node
     * @returns {Array}
     */
    getPosterity (node) {
        if (node.full_path !== '') {
            const reg = new RegExp('^' + node.full_path + '-');
            return this.datas.filter(function (x) {
                return reg.test(x.full_path);
            });
        } else {
            return this._recursiveGetPosterity(node);
        }
    };

    /**
     * 根据 字段名称 获取数据
     * @param fields
     * @returns {Array}
     */
    getDatas (fields) {
        const datas = [];
        for (const node of this.nodes) {
            if (node.b_code && node.b_code !== '') node.chapter = this.ctx.helper.getChapterCode(node.b_code);
            const data = {};
            for (const field of fields) {
                data[field] = node[field];
            }
            datas.push(data);
        }
        return datas;
    }
    /**
     * 排除 某些字段 获取数据
     * @param fields
     * @returns {Array}
     */
    getDatasWithout (fields) {
        const datas = [];
        for (const node of this.nodes) {
            if (node.b_code && node.b_code !== '') node.chapter = this.ctx.helper.getChapterCode(node.b_code);
            const data = {};
            for (const field in node) {
                if (fields.indexOf(field) === -1) {
                    data[field] = node[field];
                }
            }
            datas.push(data);
        }
        return datas;
    }
    /**
     * 获取默认数据 剔除一些树结构需要的缓存数据
     * @returns {Array}
     */
    getDefaultDatas() {
        return this.getDatasWithout(['expanded', 'visible', 'children', 'index']);
    }

    _mapTreeNode () {
        let map = {}, maxLevel = 0;
        for (const node of this.nodes) {
            let levelArr = map[node.level];
            if (!levelArr) {
                levelArr = [];
                map[node.level] = levelArr;
            }
            if (node.level > maxLevel) {
                maxLevel = node.level;
            }
            levelArr.push(node);
        }
        return [maxLevel, map];
    }
    _calculateNode (node, fun) {
        const self = this;
        if (node.children && node.children.length > 0) {
            const gather = node.children.reduce(function (rst, x) {
                const result = {};
                for (const cf of self.setting.calcFields) {
                    result[cf] = self.ctx.helper.add(rst[cf], x[cf]);
                }
                return result;
            });
            // 汇总子项
            for (const cf of this.setting.calcFields) {
                if (gather[cf]) {
                    node[cf] = gather[cf];
                } else {
                    node[cf] = null;
                }
            }
        }
        // 自身运算
        if (fun) {
            fun(node);
        } else if (this.setting.calc) {
            this.setting.calc(node);
        }
    }
    calculateAll(fun) {
        const [maxLevel, levelMap] = this._mapTreeNode();
        for (let i = maxLevel; i >= 0; i--) {
            const levelNodes = levelMap[i];
            if (levelNodes && levelNodes.length > 0) {
                for (const node of levelNodes) {
                    this._calculateNode(node, fun);
                }
            }
        }
    }
}

class billsTree extends baseTree {
    /**
     * 检查节点是否是最底层项目节
     * @param node
     * @returns {boolean}
     */
    isLeafXmj(node) {
        if (node.b_code && node.b_code !== '') {
            return false;
        }
        for (const child of node.children) {
            if (!child.b_code || child.b_code === '') {
                return false;
            }
        }
        return true;
    }
    /**
     * 查询最底层项目节(本身或父项)
     * @param {Object} node - 查询节点
     * @returns {Object}
     */
    getLeafXmjParent(node) {
        let parent = node;
        while (parent) {
            if (this.isLeafXmj(parent)) {
                return parent;
            } else {
                parent = this.getParent(parent);
            }
        }
        return null;
    }
}

class filterTree extends baseTree {
    addData(data, fields) {
        const item = {};
        for (const prop in data) {
            if (fields.indexOf(prop) >= 0) {
                item[prop] = data[prop];
            }
        }
        const keyName = itemsPre + item[this.setting.id];
        if (!this.items[keyName]) {
            item.children = [];
            item.is_leaf = true;
            item.expanded = true;
            item.visible = true;
            this.items[keyName] = item;
            this.datas.push(item);
            if (item[this.setting.pid] === this.setting.rootId) {
                this.children.push(item);
            } else {
                const parent = this.getParent(item);
                if (parent) {
                    parent.is_leaf = false;
                    parent.children.push(item);
                }
            }
        } else {
            return this.items[keyName];
        }
        return item;
    }
}

class filterGatherTree extends baseTree {

    clearDatas() {
        this.items = {};
        this.nodes = [];
        this.datas = [];
        this.children = [];
    }

    get newId() {
        if (!this._maxId) {
            this._maxId = 0;
        }
        this._maxId++;
        return this._maxId;
    }

    addNode(data, parent) {
        data[this.setting.pid] = parent ? parent[this.setting.id] : this.setting.rootId;
        let item = this.ctx.helper._.find(this.items, data);
        if (item) return item;

        item = data;
        item[this.setting.id] = this.newId;
        const keyName = itemsPre + item[this.setting.id];
        item.children = [];
        item.is_leaf = true;
        item.expanded = true;
        item.visible = true;
        this.items[keyName] = item;
        this.datas.push(item);
        if (parent) {
            item[this.setting.fullPath] = parent[this.setting.fullPath] + '-' + item[this.setting.id];
            item[this.setting.level] = parent[this.setting.level] + 1;
            item[this.setting.order] = parent.children.length + 1;
            parent.is_leaf = false;
            parent.children.push(item);
        } else {
            item[this.setting.fullPath] = '' + item[this.setting.id];
            item[this.setting.level] = 1;
            item[this.setting.order] = this.children.length + 1;
            this.children.push(item);
        }
        return item;
    }

    sortTreeNodeCustom(field, fun, isResort) {
        const self = this;
        const sortNodes = function (nodes) {
            nodes.sort(function (a, b) {
                return fun(a[field], b[field]);
            });
            for (const [i, node] of nodes.entries()) {
                node.order = i + 1;
            }
        };
        const addSortNodes = function (nodes) {
            if (!nodes) { return }
            for (let i = 0; i < nodes.length; i++) {
                self.nodes.push(nodes[i]);
                nodes[i].index = self.nodes.length - 1;
                if (!isResort) {
                    nodes[i].children = self.getChildren(nodes[i]);
                }
                sortNodes(nodes[i].children);
                addSortNodes(nodes[i].children);
            }
        };
        this.nodes = [];
        if (!isResort) {
            this.children = this.getChildren();
        }
        sortNodes(this.children);
        addSortNodes(this.children);
    }
}

class pos {
    /**
     * 构造函数
     * @param {id|Number, masterId|Number} setting
     */
    constructor (setting) {
        // 无索引
        this.datas = [];
        // 以key为索引
        this.items = {};
        // 以分类id为索引的有序
        this.ledgerPos = {};
        // pos设置
        this.setting = setting;
    }

    /**
     * 加载部位明细数据
     * @param datas
     */
    loadDatas(datas) {
        this.datas = datas;
        this.items = {};
        this.ledgerPos = {};
        for (const data of this.datas) {
            const key = itemsPre + data[this.setting.id];
            this.items[key] = data;

            const masterKey = itemsPre + data[this.setting.ledgerId];
            if (!this.ledgerPos[masterKey]) {
                this.ledgerPos[masterKey] = [];
            }
            this.ledgerPos[masterKey].push(data);
        }
        for (const prop in this.ledgerPos) {
            this.resortLedgerPos(this.ledgerPos[prop]);
        }
    }

    getLedgerPos(mid) {
        return this.ledgerPos[itemsPre + mid];
    }

    resortLedgerPos(ledgerPos) {
        if (ledgerPos instanceof Array) {
            ledgerPos.sort(function (a, b) {
                return a.porder - b.porder;
            })
        }
    }

    /**
     * 计算全部
     */
    calculateAll(fun) {
        const calcFun = fun ? fun : this.setting.calc;
        if (!calcFun) return;

        for (const pos of this.datas) {
            calcFun(pos);
        }
    }

    getDatas () {
        return this.datas;
    }
}

module.exports = {
    billsTree,
    pos,
    filterTree,
    filterGatherTree,
};