<?php
/**
 * For the full copyright and license information, please view the
 * docs/licenses/LICENSE.txt file that was distributed with this source code.
 */
class GroupReductionCore extends ObjectModel
{
    public $id_group;
    public $id_category;
    public $reduction;

    /**
     * @see ObjectModel::$definition
     */
    public static $definition = [
        'table' => 'group_reduction',
        'primary' => 'id_group_reduction',
        'fields' => [
            'id_group' => ['type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true],
            'id_category' => ['type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true],
            'reduction' => ['type' => self::TYPE_FLOAT, 'validate' => 'isPrice', 'required' => true],
        ],
    ];

    protected static $reduction_cache = [];

    public function add($autodate = true, $null_values = false)
    {
        return parent::add($autodate, $null_values) && $this->_setCache();
    }

    public function update($null_values = false)
    {
        return parent::update($null_values) && $this->_updateCache();
    }

    public function delete()
    {
        $products = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT cp.`id_product`
			FROM `' . _DB_PREFIX_ . 'category_product` cp
			WHERE cp.`id_category` = ' . (int) $this->id_category
        );

        $ids = array_column($products, 'id_product');

        if ($ids) {
            Db::getInstance()->delete('product_group_reduction_cache', 'id_product IN (' . implode(', ', $ids) . ')');
        }

        return parent::delete();
    }

    protected function _clearCache()
    {
        return Db::getInstance()->delete('product_group_reduction_cache', 'id_group = ' . (int) $this->id_group);
    }

    protected function _setCache()
    {
        $products = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT cp.`id_product`
			FROM `' . _DB_PREFIX_ . 'category_product` cp
			WHERE cp.`id_category` = ' . (int) $this->id_category
        );

        $values = [];
        foreach ($products as $row) {
            $values[] = '(' . (int) $row['id_product'] . ', ' . (int) $this->id_group . ', ' . (float) $this->reduction . ')';
        }

        if (count($values)) {
            $query = 'INSERT INTO `' . _DB_PREFIX_ . 'product_group_reduction_cache` (`id_product`, `id_group`, `reduction`)
			VALUES ' . implode(', ', $values) . ' ON DUPLICATE KEY UPDATE
			`reduction` = IF(VALUES(`reduction`) > `reduction`, VALUES(`reduction`), `reduction`)';

            return Db::getInstance()->execute($query);
        }

        return true;
    }

    protected function _updateCache()
    {
        $products = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT cp.`id_product`
			FROM `' . _DB_PREFIX_ . 'category_product` cp
			WHERE cp.`id_category` = ' . (int) $this->id_category
        );

        $ids = array_column($products, 'id_product');

        $result = true;
        if ($ids) {
            $result &= Db::getInstance()->update('product_group_reduction_cache', [
                'reduction' => (float) $this->reduction,
            ], 'id_product IN(' . implode(', ', $ids) . ') AND id_group = ' . (int) $this->id_group);
        }

        return $result;
    }

    public static function getGroupReductions($id_group, $id_lang)
    {
        $lang = $id_lang . Shop::addSqlRestrictionOnLang('cl');

        return Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT gr.`id_group_reduction`, gr.`id_group`, gr.`id_category`, gr.`reduction`, cl.`name` AS category_name
			FROM `' . _DB_PREFIX_ . 'group_reduction` gr
			LEFT JOIN `' . _DB_PREFIX_ . 'category_lang` cl ON (cl.`id_category` = gr.`id_category` AND cl.`id_lang` = ' . (int) $lang . ')
			WHERE `id_group` = ' . (int) $id_group
        );
    }

    public static function getValueForProduct($id_product, $id_group)
    {
        if (!Group::isFeatureActive()) {
            return 0;
        }

        if (!isset(self::$reduction_cache[$id_product . '-' . $id_group])) {
            self::$reduction_cache[$id_product . '-' . $id_group] = Db::getInstance()->getValue('
			SELECT `reduction`
			FROM `' . _DB_PREFIX_ . 'product_group_reduction_cache`
			WHERE `id_product` = ' . (int) $id_product . ' AND `id_group` = ' . (int) $id_group);
        }

        // Should return string (decimal in database) and not a float
        return self::$reduction_cache[$id_product . '-' . $id_group];
    }

    public static function doesExist($id_group, $id_category)
    {
        return (bool) Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
		SELECT `id_group`
		FROM `' . _DB_PREFIX_ . 'group_reduction`
		WHERE `id_group` = ' . (int) $id_group . ' AND `id_category` = ' . (int) $id_category);
    }

    public static function getGroupsByCategoryId($id_category)
    {
        return Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT gr.`id_group` as id_group, gr.`reduction` as reduction, id_group_reduction
			FROM `' . _DB_PREFIX_ . 'group_reduction` gr
			WHERE `id_category` = ' . (int) $id_category
        );
    }

    public static function getGroupsReductionByCategoryId($id_category)
    {
        return Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT gr.`id_group_reduction` as id_group_reduction, id_group
			FROM `' . _DB_PREFIX_ . 'group_reduction` gr
			WHERE `id_category` = ' . (int) $id_category
        );
    }

    public static function setProductReduction($id_product, $id_group = null, $id_category = null, $reduction = null)
    {
        $res = true;
        GroupReduction::deleteProductReduction((int) $id_product);

        $categories = Product::getProductCategories((int) $id_product);

        foreach ($categories as $category) {
            $reductions = GroupReduction::getGroupsByCategoryId((int) $category);
            if (!$reductions) {
                continue;
            }
            foreach ($reductions as $reduction) {
                $current_group_reduction = new GroupReduction((int) $reduction['id_group_reduction']);
                $res &= $current_group_reduction->_setCache();
            }
        }

        return $res;
    }

    public static function deleteProductReduction($id_product)
    {
        $query = 'DELETE FROM `' . _DB_PREFIX_ . 'product_group_reduction_cache` WHERE `id_product` = ' . (int) $id_product;

        return Db::getInstance()->execute($query);
    }

    public static function duplicateReduction($id_product_old, $id_product)
    {
        $res = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS(
            '
			SELECT pgr.`id_product`, pgr.`id_group`, pgr.`reduction`
			FROM `' . _DB_PREFIX_ . 'product_group_reduction_cache` pgr
			WHERE pgr.`id_product` = ' . (int) $id_product_old
        );

        if (!$res) {
            return true;
        }

        $query = '';

        foreach ($res as $row) {
            $query .= 'INSERT INTO `' . _DB_PREFIX_ . 'product_group_reduction_cache` (`id_product`, `id_group`, `reduction`) VALUES ';
            $query .= '(' . (int) $id_product . ', ' . (int) $row['id_group'] . ', ' . (float) $row['reduction'] . ') ON DUPLICATE KEY UPDATE `reduction` = ' . (float) $row['reduction'] . ';';
        }

        return Db::getInstance()->execute($query);
    }

    public static function deleteCategory($id_category)
    {
        $query = 'DELETE FROM `' . _DB_PREFIX_ . 'group_reduction` WHERE `id_category` = ' . (int) $id_category;

        return Db::getInstance()->execute($query);
    }

    /**
     * Reset static cache (mainly for test environment)
     */
    public static function resetStaticCache()
    {
        static::$reduction_cache = [];
    }
}