<?php
/*
* 2007-2016 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  2007-2016 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 FeatureCore extends ObjectModel
{
    /** @var string Name */
    public $name;
    public $position;

    /**
     * @see ObjectModel::$definition
     */
    public static $definition = array(
        'table' => 'feature',
        'primary' => 'id_feature',
        'multilang' => true,
        'fields' => array(
            'position' =>    array('type' => self::TYPE_INT, 'validate' => 'isInt'),

            /* Lang fields */
            'name' =>        array('type' => self::TYPE_STRING, 'lang' => true, 'validate' => 'isGenericName', 'required' => true, 'size' => 128),
        ),
    );


    protected $webserviceParameters = array(
        'objectsNodeName' => 'product_features',
        'objectNodeName' => 'product_feature',
        'fields' => array(),
    );

    /**
     * Get a feature data for a given id_feature and id_lang
     *
     * @param int $id_lang Language id
     * @param int $id_feature Feature id
     * @return array Array with feature's data
     */
    public static function getFeature($id_lang, $id_feature)
    {
        return Db::getInstance()->getRow('
			SELECT *
			FROM `'._DB_PREFIX_.'feature` f
			LEFT JOIN `'._DB_PREFIX_.'feature_lang` fl
				ON ( f.`id_feature` = fl.`id_feature` AND fl.`id_lang` = '.(int)$id_lang.')
			WHERE f.`id_feature` = '.(int)$id_feature
        );
    }

    /**
     * Get all features for a given language
     *
     * @param int $id_lang Language id
     * @return array Multiple arrays with feature's data
     */
    public static function getFeatures($id_lang, $with_shop = true)
    {
        return Db::getInstance()->executeS('
		SELECT DISTINCT f.id_feature, f.*, fl.*
		FROM `'._DB_PREFIX_.'feature` f
		'.($with_shop ? Shop::addSqlAssociation('feature', 'f') : '').'
		LEFT JOIN `'._DB_PREFIX_.'feature_lang` fl ON (f.`id_feature` = fl.`id_feature` AND fl.`id_lang` = '.(int)$id_lang.')
		ORDER BY f.`position` ASC');
    }

    /**
     * Delete several objects from database
     *
     * @param array $selection Array with items to delete
     * @return bool Deletion result
     */
    public function deleteSelection($selection)
    {
        /* Also delete Attributes */
        foreach ($selection as $value) {
            $obj = new Feature($value);
            if (!$obj->delete()) {
                return false;
            }
        }
        return true;
    }

    public function add($autodate = true, $nullValues = false)
    {
        if ($this->position <= 0) {
            $this->position = Feature::getHigherPosition() + 1;
        }

        $return = parent::add($autodate, true);
        Hook::exec('actionFeatureSave', array('id_feature' => $this->id));
        return $return;
    }

    public function delete()
    {
        /* Also delete related attributes */
        Db::getInstance()->execute('
			DELETE
				`'._DB_PREFIX_.'feature_value_lang`
			FROM
				`'._DB_PREFIX_.'feature_value_lang`
				JOIN `'._DB_PREFIX_.'feature_value`
					ON (`'._DB_PREFIX_.'feature_value_lang`.id_feature_value = `'._DB_PREFIX_.'feature_value`.id_feature_value)
			WHERE
				`'._DB_PREFIX_.'feature_value`.`id_feature` = '.(int)$this->id.'
		');
        Db::getInstance()->execute('
			DELETE FROM `'._DB_PREFIX_.'feature_value`
			WHERE `id_feature` = '.(int)$this->id
        );
        /* Also delete related products */
        Db::getInstance()->execute('
			DELETE FROM `'._DB_PREFIX_.'feature_product`
			WHERE `id_feature` = '.(int)$this->id
        );

        $return = parent::delete();
        if ($return) {
            Hook::exec('actionFeatureDelete', array('id_feature' => $this->id));
        }

        /* Reinitializing position */
        $this->cleanPositions();

        return $return;
    }

    public function update($nullValues = false)
    {
        $this->clearCache();

        $result = 1;
        $fields = $this->getFieldsLang();
        foreach ($fields as $field) {
            foreach (array_keys($field) as $key) {
                if (!Validate::isTableOrIdentifier($key)) {
                    die(Tools::displayError());
                }
            }

            $sql = 'SELECT `id_lang` FROM `'.pSQL(_DB_PREFIX_.$this->def['table']).'_lang`
					WHERE `'.$this->def['primary'].'` = '.(int)$this->id.'
						AND `id_lang` = '.(int)$field['id_lang'];
            $mode = Db::getInstance()->getRow($sql);
            $result &= (!$mode) ? Db::getInstance()->insert($this->def['table'].'_lang', $field) :
            Db::getInstance()->update(
                $this->def['table'].'_lang',
                $field,
                '`'.$this->def['primary'].'` = '.(int)$this->id.' AND `id_lang` = '.(int)$field['id_lang']
            );
        }

        if ($result) {
            $result &= parent::update($nullValues);
            if ($result) {
                Hook::exec('actionFeatureSave', array('id_feature' => $this->id));
            }
        }

        return $result;
    }

    /**
    * Count number of features for a given language
    *
    * @param int $id_lang Language id
    * @return int Number of feature
    */
    public static function nbFeatures($id_lang)
    {
        return Db::getInstance()->getValue('
		SELECT COUNT(*) as nb
		FROM `'._DB_PREFIX_.'feature` ag
		LEFT JOIN `'._DB_PREFIX_.'feature_lang` agl
		ON (ag.`id_feature` = agl.`id_feature` AND `id_lang` = '.(int)$id_lang.')
		');
    }

    /**
    * Create a feature from import
    *
    * @param int $id_feature Feature id
    * @param int $id_product Product id
    * @param array $value Feature Value
    */
    public static function addFeatureImport($name, $position = false)
    {
        $rq = Db::getInstance()->getRow('
			SELECT `id_feature`
			FROM '._DB_PREFIX_.'feature_lang
			WHERE `name` = \''.pSQL($name).'\'
			GROUP BY `id_feature`
		');
        if (empty($rq)) {
            // Feature doesn't exist, create it
            $feature = new Feature();
            $feature->name = array_fill_keys(Language::getIDs(), (string)$name);
            if ($position) {
                $feature->position = (int)$position;
            } else {
                $feature->position = Feature::getHigherPosition() + 1;
            }
            $feature->add();
            return $feature->id;
        } elseif (isset($rq['id_feature']) && $rq['id_feature']) {
            if (is_numeric($position) && $feature = new Feature((int)$rq['id_feature'])) {
                $feature->position = (int)$position;
                if (Validate::isLoadedObject($feature)) {
                    $feature->update();
                }
            }

            return (int)$rq['id_feature'];
        }
    }

    public static function getFeaturesForComparison($list_ids_product, $id_lang)
    {
        if (!Feature::isFeatureActive()) {
            return false;
        }

        $ids = '';
        foreach ($list_ids_product as $id) {
            $ids .= (int)$id.',';
        }

        $ids = rtrim($ids, ',');

        if (empty($ids)) {
            return false;
        }

        return Db::getInstance()->executeS('
			SELECT f.*, fl.*
			FROM `'._DB_PREFIX_.'feature` f
			LEFT JOIN `'._DB_PREFIX_.'feature_product` fp
				ON f.`id_feature` = fp.`id_feature`
			LEFT JOIN `'._DB_PREFIX_.'feature_lang` fl
				ON f.`id_feature` = fl.`id_feature`
			WHERE fp.`id_product` IN ('.$ids.')
			AND `id_lang` = '.(int)$id_lang.'
			GROUP BY f.`id_feature`
			ORDER BY f.`position` ASC
		');
    }

    /**
     * This metohd is allow to know if a feature is used or active
     * @since 1.5.0.1
     * @return bool
     */
    public static function isFeatureActive()
    {
        return Configuration::get('PS_FEATURE_FEATURE_ACTIVE');
    }

    /**
     * Move a feature
     * @param bool $way Up (1)  or Down (0)
     * @param int $position
     * @return bool Update result
     */
    public function updatePosition($way, $position, $id_feature = null)
    {
        if (!$res = Db::getInstance()->executeS('
			SELECT `position`, `id_feature`
			FROM `'._DB_PREFIX_.'feature`
			WHERE `id_feature` = '.(int)($id_feature ? $id_feature : $this->id).'
			ORDER BY `position` ASC'
        )) {
            return false;
        }

        foreach ($res as $feature) {
            if ((int)$feature['id_feature'] == (int)$this->id) {
                $moved_feature = $feature;
            }
        }

        if (!isset($moved_feature) || !isset($position)) {
            return false;
        }

        // < and > statements rather than BETWEEN operator
        // since BETWEEN is treated differently according to databases
        return (Db::getInstance()->execute('
			UPDATE `'._DB_PREFIX_.'feature`
			SET `position`= `position` '.($way ? '- 1' : '+ 1').'
			WHERE `position`
			'.($way
                ? '> '.(int)$moved_feature['position'].' AND `position` <= '.(int)$position
                : '< '.(int)$moved_feature['position'].' AND `position` >= '.(int)$position))
        && Db::getInstance()->execute('
			UPDATE `'._DB_PREFIX_.'feature`
			SET `position` = '.(int)$position.'
			WHERE `id_feature`='.(int)$moved_feature['id_feature']));
    }

    /**
     * Reorder feature position
     * Call it after deleting a feature.
     *
     * @return bool $return
     */
    public static function cleanPositions()
    {
        Db::getInstance()->execute('SET @i = -1', false);
        $sql = 'UPDATE `'._DB_PREFIX_.'feature` SET `position` = @i:=@i+1 ORDER BY `position` ASC';
        return (bool)Db::getInstance()->execute($sql);
    }

    /**
     * getHigherPosition
     *
     * Get the higher feature position
     *
     * @return int $position
     */
    public static function getHigherPosition()
    {
        $sql = 'SELECT MAX(`position`)
				FROM `'._DB_PREFIX_.'feature`';
        $position = DB::getInstance()->getValue($sql);
        return (is_numeric($position)) ? $position : - 1;
    }
}
