<?php
/*
* 2007-2013 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class CurrencyCore extends ObjectModel
{
	public $id;

	/** @var string Name */
	public $name;

	/** @var string Iso code */
	public $iso_code;

	/** @var string Iso code numeric */
	public $iso_code_num;

	/** @var string Symbol for short display */
	public $sign;

	/** @var int bool used for displaying blank between sign and price */
	public $blank;

	/** @var string exchange rate from euros */
	public $conversion_rate;

	/** @var boolean True if currency has been deleted (staying in database as deleted) */
	public $deleted = 0;

	/** @var int ID used for displaying prices */
	public $format;

	/** @var int bool Display decimals on prices */
	public $decimals;

	/** @var int bool active */
	public $active;

	/**
	 * @see ObjectModel::$definition
	 */
	public static $definition = array(
		'table' => 'currency',
		'primary' => 'id_currency',
		'multilang_shop' => true,
		'fields' => array(
			'name' => 			array('type' => self::TYPE_STRING, 'validate' => 'isGenericName', 'required' => true, 'size' => 32),
			'iso_code' => 		array('type' => self::TYPE_STRING, 'validate' => 'isLanguageIsoCode', 'required' => true, 'size' => 3),
			'iso_code_num' => 	array('type' => self::TYPE_STRING, 'validate' => 'isNumericIsoCode', 'size' => 3),
			'blank' => 			array('type' => self::TYPE_INT, 'validate' => 'isInt'),
			'sign' => 			array('type' => self::TYPE_STRING, 'validate' => 'isGenericName', 'required' => true, 'size' => 8),
			'format' => 		array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true),
			'decimals' => 		array('type' => self::TYPE_BOOL, 'validate' => 'isBool', 'required' => true),
			'conversion_rate' =>array('type' => self::TYPE_FLOAT, 'validate' => 'isUnsignedFloat', 'required' => true, 'shop' => true),
			'deleted' => 		array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
			'active' => 		array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
		),
	);

	/** @var array Currency cache */
	static protected $currencies = array();
	protected static $countActiveCurrencies = array();

	protected $webserviceParameters = array(
		'objectsNodeName' => 'currencies',
	);

	/**
	 * contains the sign to display before price, according to its format
	 * @var string
	 */
	public $prefix = null;
	/**
	 * contains the sign to display after price, according to its format
	 * @var string
	 */
	public $suffix = null;

	public function __construct($id = null, $id_lang = null, $id_shop = null)
	{
		parent::__construct($id, $id_lang, $id_shop);
		// prefix and suffix are convenient shortcut for displaying
		// price sign before or after the price number
		$this->prefix =	$this->format % 2 != 0 ? $this->sign.' ' : '';
		$this->suffix =	$this->format % 2 == 0 ? ' '.$this->sign : '';
	}
	/**
	 * Overriding check if currency rate is not empty and if currency with the same iso code already exists.
	 * If it's true, currency is not added.
	 *
	 * @see ObjectModelCore::add()
	 */
	public function add($autodate = true, $nullValues = false)
	{
		if ((float)$this->conversion_rate <= 0)
			return false;
		return Currency::exists($this->iso_code, $this->iso_code_num) ? false : parent::add($autodate, $nullValues);
	}

	public function update($autodate = true, $nullValues = false)
	{
		if ((float)$this->conversion_rate <= 0)
			return false;
		return parent::update($autodate, $nullValues);
	}

	/**
	 * Check if a curency already exists.
	 *
	 * @param int|string $iso_code int for iso code number string for iso code
	 * @return boolean
	 */
	public static function exists($iso_code, $iso_code_num, $id_shop = 0)
	{
		if (is_int($iso_code))
			$id_currency_exists = Currency::getIdByIsoCodeNum((int)$iso_code_num, (int)$id_shop);
		else
			$id_currency_exists = Currency::getIdByIsoCode($iso_code, (int)$id_shop);

		if ($id_currency_exists)
			return true;
		else
			return false;
	}

	public function deleteSelection($selection)
	{
		if (!is_array($selection))
			die(Tools::displayError());

		foreach ($selection as $id)
		{
			$obj = new Currency((int)($id));
			$res[$id] = $obj->delete();
		}

		foreach ($res as $value)
			if (!$value)
				return false;
		return true;
	}

	public function delete()
	{
		if ($this->id == Configuration::get('PS_CURRENCY_DEFAULT'))
		{
			$result = Db::getInstance()->getRow('SELECT `id_currency` FROM '._DB_PREFIX_.'currency WHERE `id_currency` != '.(int)($this->id).' AND `deleted` = 0');
			if (!$result['id_currency'])
				return false;
			Configuration::updateValue('PS_CURRENCY_DEFAULT', $result['id_currency']);
		}
		$this->deleted = 1;
		return $this->update();
	}

	/**
	 * Return formated sign
	 *
	 * @param string $side left or right
	 * @return string formated sign
	 */
	public function getSign($side = null)
	{
		if (!$side)
			return $this->sign;
		$formated_strings = array(
			'left' => $this->sign.' ',
			'right' => ' '.$this->sign
		);

		$formats = array(
			1 => array('left' => &$formated_strings['left'], 'right' => ''),
			2 => array('left' => '', 'right' => &$formated_strings['right']),
			3 => array('left' => &$formated_strings['left'], 'right' => ''),
			4 => array('left' => '', 'right' => &$formated_strings['right']),
			5 => array('left' => '', 'right' => &$formated_strings['right'])
		);
		if (isset($formats[$this->format][$side]))
			return ($formats[$this->format][$side]);
		return $this->sign;
	}

	/**
	 * Return available currencies
	 *
	 * @return array Currencies
	 */
	public static function getCurrencies($object = false, $active = 1)
	{
		$sql = 'SELECT *
				FROM `'._DB_PREFIX_.'currency` c
				'.Shop::addSqlAssociation('currency', 'c').'
				WHERE `deleted` = 0'
					.($active == 1 ? ' AND c.`active` = 1' : '').'
				GROUP BY c.id_currency
				ORDER BY `name` ASC';
		$tab = Db::getInstance()->executeS($sql);
		if ($object)
			foreach ($tab as $key => $currency)
				$tab[$key] = Currency::getCurrencyInstance($currency['id_currency']);
		return $tab;
	}

	public static function getCurrenciesByIdShop($id_shop = 0)
	{
		$sql = 'SELECT *
				FROM `'._DB_PREFIX_.'currency` c
				LEFT JOIN `'._DB_PREFIX_.'currency_shop` cs ON (cs.`id_currency` = c.`id_currency`)
				'.($id_shop != 0 ? ' WHERE cs.`id_shop` = '.(int)$id_shop : '').'
				GROUP BY c.id_currency
				ORDER BY `name` ASC';

		return Db::getInstance()->executeS($sql);
	}


	public static function getPaymentCurrenciesSpecial($id_module, $id_shop = null)
	{
		if (is_null($id_shop))
			$id_shop = Context::getContext()->shop->id;

		$sql = 'SELECT *
				FROM '._DB_PREFIX_.'module_currency
				WHERE id_module = '.(int)$id_module.'
					AND id_shop ='.(int)$id_shop;
		return Db::getInstance()->getRow($sql);
	}

	public static function getPaymentCurrencies($id_module, $id_shop = null)
	{
		if (is_null($id_shop))
			$id_shop = Context::getContext()->shop->id;

		$sql = 'SELECT c.*
				FROM `'._DB_PREFIX_.'module_currency` mc
				LEFT JOIN `'._DB_PREFIX_.'currency` c ON c.`id_currency` = mc.`id_currency`
				WHERE c.`deleted` = 0
					AND mc.`id_module` = '.(int)$id_module.'
					AND c.`active` = 1
					AND mc.id_shop = '.(int)$id_shop.'
				ORDER BY c.`name` ASC';
		return Db::getInstance()->executeS($sql);
	}

	public static function checkPaymentCurrencies($id_module, $id_shop = null)
	{
		if (empty($id_module))
			return false;

		if (is_null($id_shop))
			$id_shop = Context::getContext()->shop->id;

		$sql = 'SELECT *
				FROM `'._DB_PREFIX_.'module_currency`
				WHERE `id_module` = '.(int)$id_module.'
					AND `id_shop` = '.(int)$id_shop;
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql);
	}

	public static function getCurrency($id_currency)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
		SELECT *
		FROM `'._DB_PREFIX_.'currency`
		WHERE `deleted` = 0
		AND `id_currency` = '.(int)($id_currency));
	}

	/**
	 * @static
	 * @param $iso_code
	 * @param int $id_shop
	 * @return int
	 */
	public static function getIdByIsoCode($iso_code, $id_shop = 0)
	{
		$query = Currency::getIdByQuery($id_shop);
		$query->where('iso_code = \''.pSQL($iso_code).'\'');

		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue($query->build());
	}

    /**
     * @static
     * @param $iso_code
     * @param int $id_shop
     * @return int
     */
	public static function getIdByIsoCodeNum($iso_code_num, $id_shop = 0)
	{
		$query = Currency::getIdByQuery($id_shop);
		$query->where('iso_code_num = \''.pSQL($iso_code_num).'\'');

		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue($query->build());
	}

	/**
	 * @static
	 * @param int $id_shop
	 * @return DbQuery
	 */
	public static function getIdByQuery($id_shop = 0)
	{
		$query = new DbQuery();
		$query->select('c.id_currency');
		$query->from('currency', 'c');
		$query->where('deleted = 0');

		if (Shop::isFeatureActive() && $id_shop > 0)
		{
			$query->leftJoin('currency_shop', 'cs', 'cs.id_currency = c.id_currency');
			$query->where('id_shop = '.(int)$id_shop);
		}
		return $query;
	}

	/**
	 * Refresh the currency exchange rate
	 * The XML file define exchange rate for each from a default currency ($isoCodeSource).
	 *
	 * @param $data XML content which contains all the exchange rates
	 * @param $isoCodeSource The default currency used in the XML file
	 * @param $defaultCurrency The default currency object
	 */
	public function refreshCurrency($data, $isoCodeSource, $defaultCurrency)
	{
		// fetch the exchange rate of the default currency
		$exchange_rate = 1;
		if ($defaultCurrency->iso_code != $isoCodeSource)
		{
			foreach ($data->currency as $currency)
				if ($currency['iso_code'] == $defaultCurrency->iso_code)
				{
					$exchange_rate = round((float)$currency['rate'], 6);
					break;
				}
		}

		if ($defaultCurrency->iso_code == $this->iso_code)
			$this->conversion_rate = 1;
		else
		{
			if ($this->iso_code == $isoCodeSource)
				$rate = 1;
			else
			{
				foreach ($data->currency as $obj)
					if ($this->iso_code == strval($obj['iso_code']))
					{
						$rate = (float)$obj['rate'];
						break;
					}
			}

			if (isset($rate))
				$this->conversion_rate = round($rate / $exchange_rate, 6);
		}
		$this->update();
	}

	public static function getDefaultCurrency()
	{
		$id_currency = (int)Configuration::get('PS_CURRENCY_DEFAULT');
		if ($id_currency == 0)
			return false;

		return new Currency($id_currency);
	}

	public static function refreshCurrencies()
	{
		// Parse
		if (!$feed = Tools::simplexml_load_file('http://api.prestashop.com/xml/currencies.xml'))
			return Tools::displayError('Cannot parse feed.');

		// Default feed currency (EUR)
		$isoCodeSource = strval($feed->source['iso_code']);

		if (!$default_currency = Currency::getDefaultCurrency())
			return Tools::displayError('No default currency');

		$currencies = Currency::getCurrencies(true, false);
		foreach ($currencies as $currency)
			if ($currency->id != $default_currency->id)
				$currency->refreshCurrency($feed->list, $isoCodeSource, $default_currency);
	}

	/**
	 * Get current currency
	 *
	 * @deprecated as of 1.5 use $context->currency instead
	 * @return Currency
	 */
	public static function getCurrent()
	{
		Tools::displayAsDeprecated();
		return Context::getContext()->currency;
	}

	public static function getCurrencyInstance($id)
	{
		if (!isset(self::$currencies[$id]))
			self::$currencies[(int)($id)] = new Currency($id);
		return self::$currencies[(int)($id)];
	}
	
	public static function countActiveCurrencies($id_shop = null)
	{
		if ($id_shop === null)
			$id_shop = (int)Context::getContext()->shop->id;

		if (!isset(self::$countActiveCurrencies[$id_shop]))
			self::$countActiveCurrencies[$id_shop] = Db::getInstance()->getValue('
				SELECT COUNT(DISTINCT c.id_currency) FROM `'._DB_PREFIX_.'currency` c
				LEFT JOIN '._DB_PREFIX_.'currency_shop cs ON (cs.id_currency = c.id_currency AND cs.id_shop = '.(int)$id_shop.')
				WHERE c.`active` = 1
			');
		return self::$countActiveCurrencies[$id_shop];
	}

	public static function isMultiCurrencyActivated($id_shop = null)
	{
		return (Currency::countActiveCurrencies($id_shop) > 1);
	}
}