// external modules
var md5 = require("blueimp-md5");
var Sequelize = require("sequelize");
var scrypt = require('scrypt');

//core
var logger = require("../logger.js");
var letterAvatars = require('../letter-avatars.js');

module.exports = function (sequelize, DataTypes) {
    var User = sequelize.define('User', {
        id: {
            type: DataTypes.UUID,
            primaryKey: true,
            defaultValue: Sequelize.UUIDV4
        },
        profileid: {
            type: DataTypes.STRING,
            unique: true
        },
        profile: {
            type: DataTypes.TEXT
        },
        accessToken: {
            type: DataTypes.STRING
        },
        refreshToken: {
            type: DataTypes.STRING
        },
        nickname: {
            type: Sequelize.STRING,
            primaryKey: true
        },
        email: {
            type: Sequelize.TEXT,
            validate: {
                isEmail: true
            }
        },
        password: {
            type: Sequelize.TEXT,
            set: function (value) {
                var hash = scrypt.kdfSync(value, scrypt.paramsSync(0.1)).toString("hex");
                this.setDataValue('password', hash);
            }
        }
    }, {
            instanceMethods: {
                verifyPassword: function (attempt) {
                    if (scrypt.verifyKdfSync(new Buffer(this.password, "hex"), attempt)) {
                        return this;
                    } else {
                        return false;
                    }
                }
            },
            classMethods: {
                getProfile: function (user) {
                    return user.profile ? User.parseProfile(user.profile) : (user.email ? User.parseProfileByEmail(user.email) : null);
                },
                parseProfile: function (profile) {
                    try {
                        var profile = JSON.parse(profile);
                    } catch (err) {
                        logger.error(err);
                        profile = null;
                    }
                    if (profile) {
                        profile = {
                            name: profile.displayName || profile.username,
                            photo: User.parsePhotoByProfile(profile),
                            biggerphoto: User.parsePhotoByProfile(profile, true)
                        }
                    }
                    return profile;
                },
                parseProfileByEmail: function (email) {
                    var photoUrl = 'https://www.gravatar.com/avatar/' + md5(email);
                    return {
                        name: email.substring(0, email.lastIndexOf("@")),
                        photo: photoUrl += '?s=96',
                        biggerphoto: photoUrl += '?s=400'
                    };
                }
            }
        });

    return User;
}