/*
 *  This file is part of SYZOJ.
 *
 *  Copyright (c) 2017 t123yh <t123yh@outlook.com>
 *
 *  SYZOJ is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  SYZOJ is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public
 *  License along with SYZOJ. If not, see <http://www.gnu.org/licenses/>.
 */

'use strict';

let Sequelize = require('sequelize');
let db = syzoj.db;
const User = syzoj.model('user');
const Contest = syzoj.model('contest');

let model = db.define('rating_calculation', {
    id: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true },
    contest_id: {
        type: Sequelize.INTEGER,
        references: {
            model: 'contest',
            key: 'id'
        }
    }
}, {
        timestamps: false,
        tableName: 'rating_calculation',
        indexes: [
            {
                fields: ['contest_id']
            },
        ]
    });

let Model = require('./common');
class RatingCalculation extends Model {
    static async create(contest_id, newRatingList) {
        const newItem = await RatingCalculation.model.create({ contest_id: contest_id });
        const RatingHistory = syzoj.model('rating_history');
        for (const val of newRatingList) {
            await RatingHistory.create(newItem.id, val.user_id, val.rating);
        }
        return newItem;
    }

    async loadRelationships() {
        this.contest = await Contest.fromID(this.contest_id);
    }

    getModel() { return model; }

    async delete() {
        const RatingHistory = syzoj.model('rating_history');
        const histories = await RatingHistory.query(null, {
            rating_calculation_id: this.rating_calculation_id
        });
        for (const history of histories) {
            await history.loadRelationships();
            const user = history.user;
            await history.destroy();
            const ratingItem = (await RatingHistory.findOne({
                where: { user_id: user.id },
                order: 'rating_calculation_id DESC'
            }));
            user.rating = ratingItem ? ratingItem.rating_after : syzoj.config.default.user.rating;
            await user.save();
        }
        await this.destroy();
    }
}

RatingCalculation.model = model;

module.exports = RatingCalculation;