<?php

/******************************************************************************/
/****************************** DELETION FUNCTIONS ****************************/
/******************************************************************************/

function lab_migration_delete_solution($solution_id)
{
  global $user;
  $root_path = lab_migration_path();
  $status = TRUE;

  //$solution_q = db_query("SELECT * FROM {lab_migration_solution} WHERE id = %d", $solution_id);
  $query = db_select('lab_migration_solution');
            $query->fields('lab_migration_solution');
            $query->condition('id', $solution_id);
            $solution_q = $query->execute();
  $solution_data = $solution_q->fetchObject();
  if (!$solution_data)
  {
    drupal_set_message(t('Invalid solution.'), 'error');
    return FALSE;
  }

  //$experiment_q = db_query("SELECT * FROM {lab_migration_experiment} WHERE id = %d", $solution_data->experiment_id);
  $query = db_select('lab_migration_experiment');
              $query->fields('lab_migration_experiment');
              $query->condition('id', $solution_data->experiment_id);
              $experiment_q = $query->execute();
  $experiment_data = $experiment_q->fetchObject();
  if (!$experiment_data)
  {
    drupal_set_message(t('Invalid experiment.'), 'error');
    return FALSE;
  }

  /* deleting solution files */
  //$solution_files_q = db_query("SELECT * FROM {lab_migration_solution_files} WHERE solution_id = %d", $solution_id);
  $query = db_select('lab_migration_solution_files');
              $query->fields('lab_migration_solution_files');
              $query->condition('solution_id', $solution_id);
              $solution_files_q = $query->execute();
  while ($solution_files_data = $solution_files_q->fetchObject())
  {
    if (!file_exists($root_path . $solution_files_data->filepath))
    {
      $status = FALSE;
      drupal_set_message(t('Error deleting !file. File does not exists.', array('!file' => $solution_files_data->filepath)), 'error');
      continue;
    }

    /* removing solution file */
    if (!unlink($root_path . $solution_files_data->filepath))
    {
      $status = FALSE;
      drupal_set_message(t('Error deleting !file', array('!file' => $solution_files_data->filepath)), 'error');

            /* sending email to admins */
      $email_to = variable_get('lab_migration_emails', '');

	$from = variable_get('lab_migration_from_email', '');
  	$bcc="";
  	$cc=variable_get('lab_migration_cc_emails', '');

      $param['standard']['subject'] = "[ERROR] Error deleting example file";
      $param['standard']['body'] = "Error deleting solution files by " . $user->uid . " at " . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . " :
        solution id : " . $solution_id . "
        file id : " .  $solution_files_data->id . "
        file path : " . $solution_files_data->filepath."
	PDF path : " . $PdfStatus;
	$param['standard']['headers']=array('From'=>$from,'MIME-Version'=> '1.0',
    			'Content-Type'=> 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
    			'Content-Transfer-Encoding' => '8Bit',
    			'X-Mailer'=> 'Drupal','Cc' => $cc, 'Bcc' => $bcc);
	
      if (!drupal_mail('lab_migration', 'standard', $email_to, language_default(), $param, $from, TRUE))
        drupal_set_message('Error sending email message.', 'error');
    } else {
          /* deleting example files database entries */     

      db_delete('lab_migration_solution_files')
            ->condition('id', $solution_files_data->id)
            ->execute();
    }
  }

  if (!$status)
    return FALSE;

  /* removing code folder */
  $ex_path = $experiment_data->directory_name . '/EXP' . $experiment_data->number . '/CODE' . $solution_data->code_number;
  $dir_path = $root_path . $ex_path;
  if (is_dir($dir_path))
  {
    if (!rmdir($dir_path))
    {
      drupal_set_message(t('Error deleting folder !folder', array('!folder' => $dir_path)), 'error');

      /* sending email to admins */
      $email_to = variable_get('lab_migration_emails', '');
	$from = variable_get('lab_migration_from_email', '');
  	$bcc="";
  	$cc=variable_get('lab_migration_cc_emails', '');


      $param['standard']['subject'] = "[ERROR] Error deleting folder";
      $param['standard']['body'] = "Error deleting folder " . $dir_path . " by " . $user->uid . " at " . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
      $param['standard']['headers']=array('From'=>$from,'MIME-Version'=> '1.0',
    			'Content-Type'=> 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
    			'Content-Transfer-Encoding' => '8Bit',
    			'X-Mailer'=> 'Drupal','Cc' => $cc, 'Bcc' => $bcc);
	

      if (!drupal_mail('lab_migration', 'standard', $email_to, language_default(), $param, $from, TRUE))
        drupal_set_message('Error sending email message.', 'error');
      return FALSE;
    }
  } else {
    drupal_set_message(t('Cannot delete solution folder. !folder does not exists.', array('!folder' => $dir_path)), 'error');
    return FALSE;
  }

  /* deleting solution dependency and solution database entries */  
  db_delete('lab_migration_solution_dependency')->condition('solution_id', $solution_id)->execute();

  db_delete('lab_migration_solution')->condition('id', $solution_id)->execute();

  return $status;
}

function lab_migration_delete_experiment($experiment_id)
{
  $status = TRUE;
  $root_path = lab_migration_path();

  //$experiment_q = db_query("SELECT * FROM {lab_migration_experiment} WHERE id = %d", $experiment_id);
  $query = db_select('lab_migration_experiment');
              $query->fields('lab_migration_experiment');
              $query->condition('id', $experiment_id);
              $experiment_q = $query->execute();
  $experiment_data = $experiment_q->fetchObject();
  if (!$experiment_data)
  {
    drupal_set_message('Invalid experiment.', 'error');
    return FALSE;
  }

  /* deleting solutions */
  //$solution_q = db_query("SELECT * FROM {lab_migration_solution} WHERE experiment_id = %d", $experiment_id);  
  $query = db_select('lab_migration_solution');
              $query->fields('lab_migration_solution');
              $query->condition('experiment_id', $experiment_id);
              $solution_q = $query->execute();

  $delete_exp_folder = FALSE;
  while ($solution_data = $solution_q->fetchObject())
  {
  	$delete_exp_folder = TRUE;
    if (!lab_migration_delete_solution($solution_data->id))
      $status = FALSE;
  }

  if (!$delete_exp_folder)
  {
  	return TRUE;
  }

  if ($status)
  {
    $dir_path = $root_path . $experiment_data->directory_name . '/EXP' . $experiment_data->number;

    if (is_dir($dir_path))
    {
      $res = rmdir($dir_path);
      if (!$res)
      {
        drupal_set_message(t('Error deleting experiment folder !folder', array('!folder' => $dir_path)), 'error');
  
       /* sending email to admins */
        $email_to = variable_get('lab_migration_emails', '');

	$from = variable_get('lab_migration_from_email', '');
  	$bcc="";
  	$cc=variable_get('lab_migration_cc_emails', '');
	

        $param['standard']['subject'] = "[ERROR] Error deleting experiment folder";
        $param['standard']['body'] = "Error deleting folder " . $dir_path;
	$param['standard']['headers']=array('From'=>$from,'MIME-Version'=> '1.0',
    			'Content-Type'=> 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
    			'Content-Transfer-Encoding' => '8Bit',
    			'X-Mailer'=> 'Drupal','Cc' => $cc, 'Bcc' => $bcc);
        if (!drupal_mail('lab_migration', 'standard', $email_to, language_default(), $param,$from, TRUE))
          drupal_set_message('Error sending email message.', 'error');
        return FALSE;
      } else {
        return TRUE;
      }
    } else {
      drupal_set_message(t('Cannot delete experiment folder. !folder does not exists.', array('!folder' => $dir_path)), 'error');
      return FALSE;
    }
  }
  return FALSE;
}

function lab_migration_delete_lab($lab_id)
{
  $status = TRUE;
  $root_path = lab_migration_path();

  //$proposal_q = db_query("SELECT * FROM {lab_migration_proposal} WHERE id = %d", $lab_id);
  $query = db_select('lab_migration_proposal');
              $query->fields('lab_migration_proposal');
              $query->condition('id', $lab_id);
              $proposal_q = $query->execute();
  $proposal_data = $proposal_q->fetchObject();
  if (!$proposal_data)
  {
    drupal_set_message('Invalid Lab.', 'error');
    return FALSE;
  }

  /* delete experiments */
  //$experiment_q = db_query("SELECT * FROM {lab_migration_experiment} WHERE proposal_id = %d", $proposal_data->id);
  $query = db_select('lab_migration_experiment');
              $query->fields('lab_migration_experiment');
              $query->condition('proposal_id', $proposal_data->id);
              $experiment_q = $query->execute();


  while ($experiment_data = $experiment_q->fetchObject())
  {
    if (!lab_migration_delete_experiment($experiment_data->id))
    {
      $status = FALSE;
    }
  }
  return $status;
}

function lab_migration_del_lab_pdf($lab_id)
{
  $root_path = lab_migration_path();
  $dir_path = $root_path . "latex/";
  $pdf_filename = "lab_" . $lab_id . ".pdf";
  if (file_exists($dir_path . $pdf_filename))
    unlink($dir_path . $pdf_filename);
}


function lab_migration_delete_dependency($dependency_id)
{
  global $user;
  $root_path = lab_migration_path();
  $status = TRUE;

  //$dependency_files_q = db_query("SELECT * FROM {lab_migration_dependency_files} WHERE id = %d", $dependency_id);
  $query = db_select('lab_migration_dependency_files');
              $query->fields('lab_migration_dependency_files');
              $query->condition('id', $dependency_id);
              $dependency_files_q = $query->execute();
  $dependency_files_data = $dependency_files_q->fetchObject();
  if (!$dependency_files_data)
  {
    drupal_set_message(t('Invalid dependency.'), 'error');
    return FALSE;
  }

	if (!file_exists($root_path . $dependency_files_data->filepath))
	{
		drupal_set_message(t('Error deleting !file. File does not exists.', array('!file' => $dependency_files_data->filepath)), 'error');
    return FALSE;
	}

	/* removing dependency file */
	if (!unlink($root_path . $dependency_files_data->filepath))
	{
		$status = FALSE;
		drupal_set_message(t('Error deleting !file', array('!file' => $dependency_files_data->filepath)), 'error');

		/* sending email to admins */
		$email_to = variable_get('lab_migration_emails', '');
		$from = variable_get('lab_migration_from_email', '');
  		$bcc="";
  		$cc=variable_get('lab_migration_cc_emails', '');
	
		$param['standard']['subject'] = "[ERROR] Error deleting dependency file";
		$param['standard']['body'] = "Error deleting dependency files by " . $user->uid . " at " . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . " :
			dependency id : " . $dependency_id . "
			file id : " .  $dependency_files_data->id . "
			file path : " . $dependency_files_data->filepath;
		$param['standard']['headers']=array('From'=>$from,'MIME-Version'=> '1.0',
    			'Content-Type'=> 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
    			'Content-Transfer-Encoding' => '8Bit',
    			'X-Mailer'=> 'Drupal','Cc' => $cc, 'Bcc' => $bcc);

		if (!drupal_mail('lab_migration', 'standard', $email_to, language_default(), $param,$from, TRUE))
			drupal_set_message('Error sending email message.', 'error');
	} else {
		/* deleting dependency files database entries */		
    db_delete('lab_migration_dependency_files')
            ->condition('id', $dependency_id)
            ->execute();
	}

  return $status;
}