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$sql = "SELECT MIN(r.date_added) AS date_start, MAX(r.date_added) AS date_end, COUNT(r.return_id) AS `returns` FROM `" . DB_PREFIX . "return` r"; 

if (!empty($data['filter_return_status_id'])) {
	$sql .= " WHERE r.return_status_id = '" . (int)$data['filter_return_status_id'] . "'";
} else {
	$sql .= " WHERE r.return_status_id > '0'";
}

if (!empty($data['filter_date_start'])) {
	$sql .= " AND DATE(r.date_added) >= '" . $this->db->escape($data['filter_date_start']) . "'";
}

if (!empty($data['filter_date_end'])) {
	$sql .= " AND DATE(r.date_added) <= '" . $this->db->escape($data['filter_date_end']) . "'";
}

if (isset($data['filter_group'])) {
	$group = $data['filter_group'];
} else {
	$group = 'week';
}

switch($group) {
	case 'day';
		$sql .= " GROUP BY DAY(r.date_added)";
		break;
	default:
	case 'week':
		$sql .= " GROUP BY WEEK(r.date_added)";
		break;	
	case 'month':
		$sql .= " GROUP BY MONTH(r.date_added)";
		break;
	case 'year':
		$sql .= " GROUP BY YEAR(r.date_added)";
		break;									
}

if (isset($data['start']) || isset($data['limit'])) {
	if ($data['start'] < 0) {
		$data['start'] = 0;
	}			

	if ($data['limit'] < 1) {
		$data['limit'] = 20;
	}	
	
	$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
}	

$query = $this->db->query($sql);

return $query->rows;

if (!empty($data['filter_group'])) {
	$group = $data['filter_group'];
} else {
	$group = 'week';
}

switch($group) {
	case 'day';
		$sql = "SELECT COUNT(DISTINCT DAY(date_added)) AS total FROM `" . DB_PREFIX . "return`";
		break;
	default:
	case 'week':
		$sql = "SELECT COUNT(DISTINCT WEEK(date_added)) AS total FROM `" . DB_PREFIX . "return`";
		break;	
	case 'month':
		$sql = "SELECT COUNT(DISTINCT MONTH(date_added)) AS total FROM `" . DB_PREFIX . "return`";
		break;
	case 'year':
		$sql = "SELECT COUNT(DISTINCT YEAR(date_added)) AS total FROM `" . DB_PREFIX . "return`";
		break;									
}

if (!empty($data['filter_return_status_id'])) {
	$sql .= " WHERE return_status_id = '" . (int)$data['filter_return_status_id'] . "'";
} else {
	$sql .= " WHERE return_status_id > '0'";
}
		
if (!empty($data['filter_date_start'])) {
	$sql .= " AND DATE(date_added) >= '" . $this->db->escape($data['filter_date_start']) . "'";
}

if (!empty($data['filter_date_end'])) {
	$sql .= " AND DATE(date_added) <= '" . $this->db->escape($data['filter_date_end']) . "'";
}

$query = $this->db->query($sql);

return $query->row['total'];