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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Tax\Model\ResourceModel\Calculation\Rule;

/**
 * Tax rule collection
 *
 * @author      Magento Core Team <[email protected]>
 */
class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    /**
     * Resource initialization
     *
     * @return void
     */
    protected function _construct()
    {
        $this->_init(
            \Magento\Tax\Model\Calculation\Rule::class,
            \Magento\Tax\Model\ResourceModel\Calculation\Rule::class
        );
    }

    /**
     * Process loaded collection data
     *
     * @return $this
     */
    protected function _afterLoadData()
    {
        parent::_afterLoadData();
        $this->addCustomerTaxClassesToResult();
        $this->addProductTaxClassesToResult();
        $this->addRatesToResult();
        return $this;
    }

    /**
     * Join calculation data to result
     *
     * @param string $alias table alias
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     */
    public function joinCalculationData($alias)
    {
        $this->getSelect()->joinLeft(
            [$alias => $this->getTable('tax_calculation')],
            "main_table.tax_calculation_rule_id = {$alias}.tax_calculation_rule_id",
            []
        );
        $this->getSelect()->group('main_table.tax_calculation_rule_id');

        return $this;
    }

    /**
     * Join tax data to collection
     *
     * @param string $itemTable
     * @param string $primaryJoinField
     * @param string $secondaryJoinField
     * @param string $titleField
     * @param string $dataField
     * @param string $dataTitleField
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     */
    protected function _add(
        $itemTable,
        $primaryJoinField,
        $secondaryJoinField,
        $titleField,
        $dataField,
        $dataTitleField = ''
    ) {
        $children = [];
        foreach ($this as $rule) {
            $children[$rule->getId()] = [];
        }
        if (!empty($children)) {
            $joinCondition = sprintf('item.%s = calculation.%s', $secondaryJoinField, $primaryJoinField);
            $select = $this->getConnection()->select()->from(
                ['calculation' => $this->getTable('tax_calculation')],
                ['calculation.tax_calculation_rule_id']
            )->join(
                ['item' => $this->getTable($itemTable)],
                $joinCondition,
                ["item.{$titleField}", "item.{$secondaryJoinField}"]
            )->where(
                'calculation.tax_calculation_rule_id IN (?)',
                array_keys($children)
            )->distinct(
                true
            );

            $data = $this->getConnection()->fetchAll($select);
            foreach ($data as $row) {
                $children[$row['tax_calculation_rule_id']][$row[$secondaryJoinField]] = $row[$titleField];
            }
        }

        foreach ($this as $rule) {
            if (isset($children[$rule->getId()])) {
                $rule->setData($dataField, array_keys($children[$rule->getId()]));
                if (!empty($dataTitleField)) {
                    $rule->setData($dataTitleField, $children[$rule->getId()]);
                }
            }
        }

        return $this;
    }

    /**
     * Add product tax classes to result
     *
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     */
    public function addProductTaxClassesToResult()
    {
        return $this->_add('tax_class', 'product_tax_class_id', 'class_id', 'class_name', 'product_tax_classes');
    }

    /**
     * Add customer tax classes to result
     *
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     */
    public function addCustomerTaxClassesToResult()
    {
        return $this->_add('tax_class', 'customer_tax_class_id', 'class_id', 'class_name', 'customer_tax_classes');
    }

    /**
     * Add rates to result
     *
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     */
    public function addRatesToResult()
    {
        return $this->_add(
            'tax_calculation_rate',
            'tax_calculation_rate_id',
            'tax_calculation_rate_id',
            'code',
            'tax_rates',
            'tax_rates_codes'
        );
    }

    /**
     * Add class type filter
     *
     * @param string $type
     * @param int $id
     * @return \Magento\Tax\Model\ResourceModel\Calculation\Rule\Collection
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    public function setClassTypeFilter($type, $id)
    {
        switch ($type) {
            case \Magento\Tax\Model\ClassModel::TAX_CLASS_TYPE_PRODUCT:
                $field = 'cd.product_tax_class_id';
                break;
            case \Magento\Tax\Model\ClassModel::TAX_CLASS_TYPE_CUSTOMER:
                $field = 'cd.customer_tax_class_id';
                break;
            default:
                throw new \Magento\Framework\Exception\LocalizedException(__('Invalid type supplied'));
                break;
        }

        $this->joinCalculationData('cd');
        $this->addFieldToFilter($field, $id);
        return $this;
    }
}