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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

use yii\db\Migration;

/**
 * Initializes i18n messages tables.
 *
 *
 *
 * @author Dmitry Naumenko <d.naumenko.a@gmail.com>
 * @since 2.0.7
 */
class m150207_210500_i18n_init extends Migration
{
    public function up()
    {
        $tableOptions = null;
        if ($this->db->driverName === 'mysql') {
            // https://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci
            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
        }

$this->createTable('{{%source_message}}', [
            'id' => $this->primaryKey(),
            'category' => $this->string(),
            'message' => $this->text(),
        ], $tableOptions);

$this->createTable('{{%message}}', [
            'id' => $this->integer()->notNull(),
            'language' => $this->string(16)->notNull(),
            'translation' => $this->text(),
        ], $tableOptions);

$this->addPrimaryKey('pk_message_id_language', '{{%message}}', ['id', 'language']);
        $onUpdateConstraint = 'RESTRICT';
        if ($this->db->driverName === 'sqlsrv') {
            // 'NO ACTION' is equivalent to 'RESTRICT' in MSSQL
            $onUpdateConstraint = 'NO ACTION';
        }
        $this->addForeignKey('fk_message_source_message', '{{%message}}', 'id', '{{%source_message}}', 'id', 'CASCADE', $onUpdateConstraint);
        $this->createIndex('idx_source_message_category', '{{%source_message}}', 'category');
        $this->createIndex('idx_message_language', '{{%message}}', 'language');
    }

public function down()
    {
        $this->dropForeignKey('fk_message_source_message', '{{%message}}');
        $this->dropTable('{{%message}}');
        $this->dropTable('{{%source_message}}');
    }
}