var Sequelize = require('sequelize');
var sequelize = new Sequelize('database', null, null, {
    dialect: 'sqlite',
    pool: {
        max: 5,
        min: 0,
        idle: 10000
    },
    storage: 'database.sqlite'
});

var Note = sequelize.define('Note', {
    id: { type: Sequelize.STRING(6), unique: true, primaryKey: true },
    deprecatedId: Sequelize.TEXT,
    text: Sequelize.TEXT,
    published: { type: Sequelize.DATE, defaultValue: Sequelize.NOW },
    edited: { type: Sequelize.DATE, allowNull: true, defaultValue: null },
    password: Sequelize.STRING(16),
    views: { type: Sequelize.INTEGER, defaultValue: 0 }
});

sequelize.sync();

module.exports.getNote = id => Note.findById(id);

module.exports.getNoteId = deprecatedId => Note.findOne({
    where: { deprecatedId: deprecatedId }
});

var generateId = () => [1, 1, 1, 1, 1]
    .map(() => {
        var code = Math.floor(Math.random() * 36);
        return String.fromCharCode(code + (code < 10 ? 48 : 87));
    })
    .join('');

var getFreeId = () => {
    var id = generateId();
    return Note.findById(id).then(result => result ? getFreeId() : id);
};

module.exports.addNote = (note, password) => getFreeId().then(id => Note.create({
    id: id,
    text: note,
    password: password
}));

var passwordCheck = (note, password, callback) => 
    (!note || note.password.length === 0 || note.password !== password) ?
        new Promise((resolve, reject) => reject({ message: 'Password is wrong' })) :
        callback();

module.exports.updateNote = (id, password, text) =>
    Note.findById(id).then(note =>
        passwordCheck(note, password, () => {
            note.text = text;
            note.edited = new Date();
            return note.save();
        }));

module.exports.deleteNote = (id, password) =>
    Note.findById(id).then(note =>
        passwordCheck(note, password, () => note.destroy()));