/**
 * Created by CSL on 2018-12-17.
 */

let mongoose = require('mongoose');
let blModel = mongoose.model('blockLibsModel');

module.exports = {
    getLibNames: getLibNames,
    getLib: getLib,
    getLibNamesAndFirstLib: getLibNamesAndFirstLib,
    saveBlock: saveBlock
};

// userID、compilationID
async function getLibNames(data) {
    let libNames = await blModel.find({userID: data.userID, compilation: data.compilationID}, ["libID","libName","-_id"]);
    return libNames;
};

// libID
async function getLib(data) {
    let lib = await blModel.findOne({libID: data.libID});
    return lib;
};

// userID、compilationID
async function getLibNamesAndFirstLib(data) {
    let libNames = await getLibNames(data);
    let firstLib = await getLib(libNames[0]);
    return {libNames: libNames, firstLib: firstLib};
};

/*------------------------------------------------------------------------------
data参数示例：
        {
            libID: 3,
            nodeID: 5,
            create: {node}
            delete: true
            update: {nodeName: 'xxx', children: [...]}
        }
说明：   libID、nodeID 必须。 create|update|delete三选一。
        create属性值是完整的node节点数据。
        delete属性值是true。
        update属性值是要修改的属性键值对组成的对象。
------------------------------------------------------------------------------*/
async function saveBlock(data) {
    if (data.create) {
        await blModel.update({libID: data.libID}, {$addToSet: {datas: data.create}});
    }
    if (data.delete) {
        await blModel.update({libID: data.libID}, {$pull: {datas: {ID: data.nodeID}}});
    }
    else if (data.update){
        let doc = await blModel.findOne({libID: data.libID});
        let datas = doc._doc.datas;
        for (let i = 0; i < datas.length; i++) {
            if (datas[i].ID == data.nodeID) {
                for (let pn in data.update){
                    datas[i][pn] = data.update[pn];
                };
                await doc.save();
                break;
            }
        };
    };
    return 'saveBlock.OK';
};