const menuServices = require('../../services/menus.js')


function findeBelong(data, index) {
    let array = [];
    for (let i = data.length - 1; i >= 0; i--) {
        if (data[i].belongto == index) {
            const obj = {
                id: data[i].id,
                name: data[i].name,
                desc: data[i].about,
                children: []
            }
            array.push(obj);
            data.splice(i, 1);
        }
    }
    return array;
}

function sortTree(arr, all) {
    let tree = (arr, all) => {
        for (let i = 0; i < arr.length; i++) {
            let item = findeBelong(all, arr[i].id);
            for (let j = 0; j < item.length; j++) {
                const obj = {
                    id: item[j].id,
                    name: item[j].name,
                    desc: item[j].desc,
                    children: []
                }
                arr[i].children.push(obj);
            }
            tree(arr[i].children, all)
        }
    }
    tree(arr, all)
}

module.exports = {
    /**
     * 获取所有的菜单
     * @param ctx
     * @param next
     * @returns {Promise<void>}
     */
    async getAll(ctx, next) {
        let result = {
            success: false,
            message: '',
            data: null
        }
        let getResult = await menuServices.getAllMenus();
        if (getResult && Array.isArray(getResult)) {
            let menus = JSON.parse(JSON.stringify(getResult));
            let fa = findeBelong(menus, '0');
            sortTree(fa, menus);
            if (menus.length > 0) {
                result.success = false;
                result.message = '菜单不完整';
                ctx.body = result
                return
            } else {
                result.success = true;
                result.message = 'success';
                result.data = fa;
            }

        } else{
            result.success = false;
            result.message = 'fail';
            ctx.body = result
            return ;
        }
        //menus有长度表示还有菜单没消耗完
        ctx.body = result
    },
    /**
     * 创建菜单
     * @param ctx
     * @param next
     * @returns {Promise<void>}
     */
    async createOne(ctx, next) {
        let result = {
            success: false,
            message: '',
            data: null
        }
        let formData = ctx.request.body;

        //验证参数的必需
        let menuResult = await menuServices.validatorNeed(formData, [
            {key: 'name', error: '标题不能为空', validate: (data) => data == undefined},
            {key: 'belongto', error: '没有所属ID', validate: (data) => data == undefined}
        ]);
        if (!menuResult.success) {
            result.success = false;
            result.message = menuResult.message;
            ctx.body = result;
            return;
        } else {
            //    验证所属ID是数据库中的
            if (Number(formData.belongto) > 0) {
                let allMenus = await menuServices.getAllMenus();
                let allID = allMenus.map(v => v.id);
                if (allID.indexOf(formData.belongto) == -1) {
                    result.success = false;
                    result.message = '没有该菜单';
                    ctx.body = result;
                    return;
                }
            }
            let createResult = await menuServices.createMenu(formData);
            if (createResult && createResult.insertId * 1 > 0) {
                result.success = true;
                result.message = '创建成功';
            } else {
                result.success = true;
                result.message = '系统错误';
                ctx.body = result;
                return;
            }
        }
        ctx.body = result;
    },
    /**
     *
     * 修改菜单
     */
    async updateOne(ctx, next) {
        let result = {
            success: false,
            message: '',
            data: null
        }
        let formData = ctx.request.body;
        //验证参数的必需
        let menuResult = await menuServices.validatorNeed(formData, [
            {key: 'id', error: 'id不能为空', validate: (data) => data == undefined},
            {
                key: 'id', error: '没有这个菜单', validate: async (data) => {
                    let allMenus = await menuServices.getAllMenus();
                    let allID = allMenus.map(v => v.id);
                    if (allID.indexOf(formData.id) == -1) {
                        return true;
                    }
                    return false;
                }
            },
            {key: 'belongto', error: '没有父类', validate: (data) => data == undefined || data < 0},
            {
                key: 'belongto', error: '没有父ID', validate: async (data) => {
                    if (data == 0) {
                        return false;
                    }
                    let allMenus = await menuServices.getAllMenus();
                    let allID = allMenus.map(v => v.id);
                    if (allID.indexOf(formData.belongto) == -1) {
                        return true;
                    }
                    return false;
                }
            },
            {key: 'id', error: 'ID不能与父ID相同', validate: (data) => formData.id == formData.belongto}
        ]);
        if (!menuResult.success) {
            result.success = false;
            result.message = menuResult.message;
            ctx.body = result;
            return;
        } else {
            let updateResult = await menuServices.updateMenu(formData);
            if (updateResult) {
                result.success = true;
                result.message = 'success';
            } else {
                result.success = false;
                result.message = 'fail';
            }
        }
        ctx.body = result;
    },
    /**
     * 删除菜单
     */
    async deleteOne(ctx, next) {
        let result = {
            success: false,
            message: '',
            data: null
        }
        let formData = ctx.request.body;
        //验证参数的必需
        let menuResult = await menuServices.validatorNeed(formData, [
            {key: 'id', error: 'id不能为空', validate: (data) => data == undefined},
            {
                key: 'id', error: '没有这个菜单', validate: async (data) => {
                    let allMenus = await menuServices.getAllMenus();
                    let allID = allMenus.map(v => v.id);
                    if (allID.indexOf(formData.id) == -1) {
                        return true;
                    }
                    return false;
                }
            },
            {
                key: 'id', error: '这个菜单存在子菜单，替换ID出错', validate: async (data) => {
                    let judgeResult  = await menuServices.judgeID(data);
                    if (formData.fix==0){
                        return false;
                    }
                   if(judgeResult&&!formData.fix){
                       return true
                   }else  if(judgeResult&&formData.fix){
                        //替换ID不能跟要删除的ID相同
                        if (formData.fix==formData.id){
                            return '替换ID不能跟要删除的ID相同';
                        }
                       // 替换ID不能跟需要修改的ID相同
                       let uID = judgeResult.map(v => v.id);
                       if (uID.indexOf(formData.fix) != -1) {
                           return '替换ID不能跟需要修改的ID相同';
                       }
                       // 替换ID必须存在与菜单中
                       let allMenus = await menuServices.getAllMenus();
                       let allID = allMenus.map(v => v.id);
                       if (allID.indexOf(formData.fix) == -1) {
                           return '替换ID必须存在与菜单中';
                       }else {
                           return false;
                       }
                   }else {
                       return false
                   }
                }
            },
        ]);
        if (!menuResult.success) {
            result.success = false;
            result.message = menuResult.message;
            ctx.body = result;
            return;
        } else {
            let judgeResult  = await menuServices.judgeID(formData.id);
            let deleteResult = await menuServices.deleteMenu(formData,judgeResult,formData.fix);
            if (deleteResult){
                //删除成功
                result.success = true;
                result.message = 'success';
            } else {
                result.success = false;
                result.message = 'fail';
            }
        }
        ctx.body = result;
    }
}