var StoreModule = {

    write: function (key, value, callback, callback_error) {
        try {
            localStorage[key] = JSON.stringify(value);

            if (typeof callback === "function") {
                callback();
            }
        } catch (e) {
            if (typeof callback_error === "function") {
                callback_error(e);
            }
        }
    },

    read: function (key) {
        return JSON.parse(localStorage[key]);
    },

    exists: function (key) {
        if (localStorage.getItem(key) === null) {
            return false;
        } else {
            return true;
        }
    },

    delete: function (key) {
        try {
            localStorage.removeItem(key);
        } catch (e) {

        }
    },

    clear: function () {
        try {
            localStorage.clear();
        } catch (e) {

        }
    },

    save_last_db_logged: function () {
        var admin_db_id = AccountModule.get_logged_admin_db();

        this.write('last_db_logged', admin_db_id);
    },

    read_last_db_logged: function () {
        var last = null;

        if (this.exists('last_db_logged')) {
            last = this.read('last_db_logged');
        }

        return last;
    },

    save_last_user_logged: function (user) {
        this.write('last_user_logged', user);
    },

    read_last_user_logged: function () {
        var last = '';

        if (this.exists('last_user_logged')) {
            last = this.read('last_user_logged');
        }

        return last;
    },

    save_last_password_logged: function (password) {
        this.write('last_password_logged', password);
    },

    read_last_password_logged: function () {
        var last = '';

        if (this.exists('last_password_logged')) {
            last = this.read('last_password_logged');
        }

        return last;
    },

    delete_last_login: function () {
        if (this.exists('last_db_logged')) {
            this.delete('last_db_logged');
        }

        if (this.exists('last_user_logged')) {
            this.delete('last_user_logged');
        }

        if (this.exists('last_password_logged')) {
            this.delete('last_password_logged');
        }
    },

    storage_data_db_key: function () {
        var admin_db_id = AccountModule.get_logged_admin_db();

        return 'db_' + admin_db_id + '_';
    },

    get_keys_containing_keyword: function (keyword) {
        var keys = [];

        for (var key in localStorage) {
            if (localStorage.hasOwnProperty(key)) {
                if (key.indexOf(keyword) !== -1) {
                    keys.push(key);
                }
            }
        }

        return keys;
    }

};