<?php defined('SYSPATH') OR die('No direct script access.');

/**
 * model combining
 */
class Migration_Kangana_20161016123906 extends Minion_Migration_Base {

	/**
	 * Run queries needed to apply this migration
	 *
	 * @param Kohana_Database $db Database connection
	 */
  public function up(Kohana_Database $db)
  {
    echo 'Opening the transaction.'.PHP_EOL;
    $db->begin();
    try
    {
      echo 'Altering tables.'.PHP_EOL;
      $db->query(NULL, 'ALTER TABLE `letters` ADD COLUMN `timestamp` timestamp NULL DEFAULT CURRENT_TIMESTAMP');
      $db->query(NULL, "alter table `letters` add column `sent` int(1) null default '0'");
      $db->query(NULL, "alter table `letters` add column `is_draft` int(1) not null default '0'");
      $db->query(NULL, "alter table `courses` add column `type` int(2) not null default '0'");
      echo "Copying Subscription model to Courses.".PHP_EOL;

      $subscriptions = DB::select()->from('subscriptions')->as_object()->execute($db);

      if (!empty($subscriptions))
      {
        foreach ($subscriptions as $subscription)
        {
          $query = DB::query(
            Database::INSERT,
            'INSERT INTO courses (type, title, description, price)
            VALUES(:type, :title, :description, :price)'
          );
          $query->parameters(array(
            ':type' => Model_Course::TYPE_IRREGULAR,
            ':title' => $subscription->title,
            ':description' => $subscription->description,
            ':price' => $subscription->price
          ));
          $query->execute($db);
          echo 'Migrating subscription "'.$subscription->title.'"'.PHP_EOL;

          $course_id = DB::select('id')
            ->from('courses')
            ->where('title', '=', $subscription->title)
            ->and_where('description', '=', $subscription->description)
            ->and_where('type', '=', Model_Course::TYPE_IRREGULAR)
            ->execute($db)
            ->get('id');

          echo 'Migrating links between subscriptions and clients.';
          $clients = DB::select('client_id')
            ->from('clients_subscriptions')
            ->where('subscription_id', '=', $subscription->id)
            ->execute($db)
            ->as_array(NULL, 'client_id');

          foreach ($clients as $client)
          {
            $db->query(NULL, 'INSERT INTO clients_courses (client_id, course_id)
              VALUES ('.$client.', '.$course_id.')');
          }

          echo 'Migrating links between subscriptions and groups.';
          $groups = DB::select('group_id')
            ->from('subscriptions_groups')
            ->where('subscription_id', '=', $subscription->id)
            ->execute($db)
            ->as_array(NULL, 'group_id');

          foreach ($groups as $group)
          {
            $db->query(NULL, 'INSERT INTO courses_groups (group_id, course_id)
              VALUES ('.$group.', '.$course_id.')');
          }

          echo 'Migrating Instants.';

          $instants = DB::select()
            ->from('instants')
            ->where('subscription_id', '=', $subscription->id)
            ->as_object()
            ->execute($db);
          foreach ($instants as $instant)
          {
            echo 'Migrating letter "'.$instant->subject.'"'.PHP_EOL;
            $query = DB::query(
              Database::INSERT,
              'INSERT INTO letters (course_id, subject, text, timestamp, sent)
              VALUES(:course_id, :subject, :text, :timestamp, :sent)'
            );

            $query->parameters(array(
              ':course_id' => $course_id,
              ':subject' => $instant->subject,
              ':text' => $instant->text,
              ':timestamp' => $instant->timestamp,
              ':sent' => $instant->sent,
            ));
            $query->execute($db);
          }
        }
      }

      $db->query(NULL, "DROP TABLE instants");
      $db->query(NULL, "DROP TABLE subscriptions_groups");
      $db->query(NULL, "DROP TABLE clients_subscriptions");
      $db->query(NULL, "DROP TABLE subscriptions");

      $db->commit();
      echo 'All done.'.PHP_EOL;
    }
    catch (Database_Exception $e)
    {
      $db->rollback();
    }
  }

  /**
   * Run queries needed to remove this migration
   *
   * @param Kohana_Database $db Database connection
   */
  public function down(Kohana_Database $db)
  {
    echo 'Opening the transaction.'.PHP_EOL;
    $db->begin();
    try
    {
      echo 'Altering tables.'.PHP_EOL;
      $db->query(NULL, 'ALTER TABLE `letters` DROP COLUMN `timestamp`');
      $db->query(NULL, "alter table `letters` DROP column `sent`");
      $db->query(NULL, "alter table `letters` DROP column `is_draft`");
      $db->query(NULL, "alter table `courses` DROP column `type`");
      $db->commit();
      echo 'All done.'.PHP_EOL;
    }
    catch (Database_Exception $e)
    {
      $db->rollback();
    }
  }
}