webdev-task-2_uskov

const multivarka = require('./multivarka');

/**
 * Получаем соединение
 * @returns {Collection|MultivarkaConnection|*}
 * @private
 */
function _getMultivarka() {
    var connection = connection || multivarka
        .server('mongodb://localhost/testdb')
        .collection('webdev2');

    return connection;
}

/**
 * Делаем простой find
 * @private
 */
function _runFindOperation() {
    _getMultivarka()
        .find(function (err, data) {
            console.log('show all ok');
            console.log(err || data);
        });
}

/**
 * Делаем find с equal
 * @private
 */
function _runEqualOperation() {
    _getMultivarka()
        .where('name')
        .equal('Пётр1')
        .find(function (err, data) {
            console.log('equal ok');
            console.log(err || data);
        });
}

/**
 * Делаем find с lessThan
 * @private
 */
function _runLessThanOperation() {
    _getMultivarka()
        .where('grade')
        .lessThan(2)
        .find(function (err, data) {
            console.log('less than ok');
            console.log(err || data);
        });
}

/**
 * Делаем find с greatThan
 * @private
 */
function _runGreatThanOperation() {
    _getMultivarka()
        .where('grade')
        .greatThan(4)
        .find(function (err, data) {
            console.log('great than ok');
            console.log(err || data);
        });
}

/**
 * Делаем find с include
 * @private
 */
function include() {
    _getMultivarka()
        .where('group')
        .include(['200', '100'])
        .find(function (err, data) {
            console.log('include ok');
            console.log(err || data);
        });
}

/**
 * Делаем find с not equal
 * @private
 */
function _runNotOperation() {
    _getMultivarka()
        .where('name')
        .not()
        .equal('Пётр6')
        .find(function (err, data) {
            console.log('not is ok');
            console.log(err || data);
        });
}

/**
 * Делаем update
 * @private
 */
function _runUpdateOperation() {
    _getMultivarka()
        .where('name')
        .equal('Пётр6')
        .set('group', '100')
        .update(function (err, data) {
            console.log('update is ok');
            console.log(err || data);
        });
}


/**
 * Чистим базу
 */
function flushData() {
    _getMultivarka()
        .remove(function (err, data) {
            console.log('remove ok');
            err && console.log(err);
        });
}

/**
 * Подготавливаем данные
 */
function prepareData() {
    const students = [
        {name: 'Пётр1', group: 300, grade: 4},
        {name: 'Пётр2', group: 200, grade: 4},
        {name: 'Пётр3', group: 100, grade: 3},
        {name: 'Пётр4', group: 105, grade: 2},
        {name: 'Пётр5', group: 700, grade: 1},
        {name: 'Пётр6', group: 300, grade: 5}
    ];

    _getMultivarka().insert(students, function (err, data) {
        console.log('insert first ok');
        console.log(err || data);
    });
}

/**
 * Запускаем операции на выполнение
 */
function runOperations() {
    _runFindOperation();
    _runEqualOperation();
    _runLessThanOperation();
    _runGreatThanOperation();
    _runNotOperation();
    _runUpdateOperation();
}

(function() {
    flushData();
    prepareData();
    runOperations();
})();