admin/model/sale/voucher.php

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<?php
class ModelSaleVoucher extends Model {
	public function addVoucher($data) {
		$this->db->query("INSERT INTO " . DB_PREFIX . "voucher SET code = '" . $this->db->escape((string)$data['code']) . "', from_name = '" . $this->db->escape((string)$data['from_name']) . "', from_email = '" . $this->db->escape((string)$data['from_email']) . "', to_name = '" . $this->db->escape((string)$data['to_name']) . "', to_email = '" . $this->db->escape((string)$data['to_email']) . "', voucher_theme_id = '" . (int)$data['voucher_theme_id'] . "', message = '" . $this->db->escape((string)$data['message']) . "', amount = '" . (float)$data['amount'] . "', status = '" . (int)$data['status'] . "', date_added = NOW()");

		return $this->db->getLastId();
	}

	public function editVoucher($voucher_id, $data) {
		$this->db->query("UPDATE " . DB_PREFIX . "voucher SET code = '" . $this->db->escape((string)$data['code']) . "', from_name = '" . $this->db->escape((string)$data['from_name']) . "', from_email = '" . $this->db->escape((string)$data['from_email']) . "', to_name = '" . $this->db->escape((string)$data['to_name']) . "', to_email = '" . $this->db->escape((string)$data['to_email']) . "', voucher_theme_id = '" . (int)$data['voucher_theme_id'] . "', message = '" . $this->db->escape((string)$data['message']) . "', amount = '" . (float)$data['amount'] . "', status = '" . (int)$data['status'] . "' WHERE voucher_id = '" . (int)$voucher_id . "'");
	}

	public function deleteVoucher($voucher_id) {
		$this->db->query("DELETE FROM " . DB_PREFIX . "voucher WHERE voucher_id = '" . (int)$voucher_id . "'");
		$this->db->query("DELETE FROM " . DB_PREFIX . "voucher_history WHERE voucher_id = '" . (int)$voucher_id . "'");
	}

	public function getVoucher($voucher_id) {
		$query = $this->db->query("SELECT DISTINCT * FROM " . DB_PREFIX . "voucher WHERE voucher_id = '" . (int)$voucher_id . "'");

		return $query->row;
	}

	public function getVoucherByCode($code) {
		$query = $this->db->query("SELECT DISTINCT * FROM " . DB_PREFIX . "voucher WHERE code = '" . $this->db->escape($code) . "'");

		return $query->row;
	}

	public function getVouchers($data = array()) {
		$sql = "SELECT v.voucher_id, v.order_id, v.code, v.from_name, v.from_email, v.to_name, v.to_email, (SELECT vtd.name FROM " . DB_PREFIX . "voucher_theme_description vtd WHERE vtd.voucher_theme_id = v.voucher_theme_id AND vtd.language_id = '" . (int)$this->config->get('config_language_id') . "') AS theme, v.amount, v.status, v.date_added FROM " . DB_PREFIX . "voucher v";

		$sort_data = array(
			'v.code',
			'v.from_name',
			'v.to_name',
			'theme',
			'v.amount',
			'v.status',
			'v.date_added'
		);

		if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
			$sql .= " ORDER BY " . $data['sort'];
		} else {
			$sql .= " ORDER BY v.date_added";
		}

		if (isset($data['order']) && ($data['order'] == 'DESC')) {
			$sql .= " DESC";
		} else {
			$sql .= " ASC";
		}

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

			if ($data['limit'] < 1) {