const { DataTypes, Model } = require("sequelize");
var crypto = require('crypto');
var jwt = require('jsonwebtoken'),
    config = require('../../../config')

const sequelize = require("../../config/sequelize");

class User extends Model { }

const UserModel = () => {
    User.init(
        {
            id: {
                type: DataTypes.STRING(24),
                allowNull: false,
                primaryKey: true
            },
            email: {
                type: DataTypes.STRING(255),
                allowNull: false,
                unique: "email"
            },
            username: {
                type: DataTypes.STRING(255),
                allowNull: false,
                unique: "username"
            },
            firstname: {
                type: DataTypes.STRING(255),
                allowNull: true
            },
            lastname: {
                type: DataTypes.STRING(255),
                allowNull: true
            },
            phone: {
                type: DataTypes.STRING(20),
                allowNull: true
            },
            image: {
                type: DataTypes.STRING(128),
                allowNull: true
            },
            role: {
                type: DataTypes.STRING(20),
                allowNull: true
            },
            salt: {
                type: DataTypes.STRING(255),
                allowNull: false
            },
            hash: {
                type: DataTypes.TEXT,
                allowNull: false
            }
        },
        {
            sequelize,
            tableName: 'user',
            timestamps: true,
            indexes: [
                {
                    name: "PRIMARY",
                    unique: true,
                    using: "BTREE",
                    fields: [
                        { name: "id" },
                    ]
                },
                {
                    name: "email",
                    unique: true,
                    using: "BTREE",
                    fields: [
                        { name: "email" },
                    ]
                },
                {
                    name: "username",
                    unique: true,
                    using: "BTREE",
                    fields: [
                        { name: "username" },
                    ]
                },
            ]
        }
    );

    User.beforeCreate((user) => {
        if (typeof user.username === 'undefined') {
            user.username = `${user.firstname}_${user.lastname}`;
        }
        user.setPassword(user.password);
        user.role = 'User';
    });

    User.prototype.validPassword = function (password) {
        let hash = crypto.pbkdf2Sync(password, this.salt, 10000, 512, 'sha512').toString('hex');
        return this.hash === hash;
    };

    User.prototype.setPassword = function (password) {
        this.salt = crypto.randomBytes(16).toString('hex');
        this.hash = crypto.pbkdf2Sync(password, this.salt, 10000, 512, 'sha512').toString('hex');
    };

    User.prototype.generateJWT = function () {
        var today = new Date();
        var exp = new Date(today.getTime() + (config.session_lifetime * 1000));

        return jwt.sign({
            id: this.id,
            username: this.username,
            exp: parseInt(exp.getTime() / 1000)
        }, config.secret, { algorithm: 'HS256' });
    };

    User.prototype.toAuthJSON = function () {
        return {
            id: this.id,
            email: this.email,
            username: this.username,
            firstname: this.firstname,
            lastname: this.lastname,
            phone: this.phone,
            image: this.image || '/assets/images/avatars/default.jpg',
            role: this.role,
            token: this.generateJWT()
        };
    };

    User.prototype.toJSONFor = function () {
        return {
            id: this.id,
            email: this.email,
            username: this.username,
            firstname: this.firstname,
            lastname: this.lastname,
            phone: this.phone,
            image: this.image,
            role: this.role
        };
    };

    User.prototype.toProfileJSONFor = function () {
        return {
            email: this.email,
            username: this.username,
            firstname: this.firstname,
            lastname: this.lastname,
            phone: this.phone,
            image: this.image || '/assets/images/avatars/default.jpg'
        };
    };

    return User;
};

module.exports = UserModel;