<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         4.0.3
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Database;

use Cake\Database\Expression\FunctionExpression;

/**
 * Responsible for compiling a Query object into its SQL representation
 * for Postgres
 *
 * @internal
 */
class PostgresCompiler extends QueryCompiler
{
    /**
     * Always quote aliases in SELECT clause.
     *
     * Postgres auto converts unquoted identifiers to lower case.
     *
     * @var bool
     */
    protected $_quotedSelectAliases = true;

    /**
     * @inheritDoc
     */
    protected $_templates = [
        'delete' => 'DELETE',
        'where' => ' WHERE %s',
        'group' => ' GROUP BY %s',
        'order' => ' %s',
        'limit' => ' LIMIT %s',
        'offset' => ' OFFSET %s',
        'epilog' => ' %s',
    ];

    /**
     * Helper function used to build the string representation of a HAVING clause,
     * it constructs the field list taking care of aliasing and
     * converting expression objects to string.
     *
     * @param array $parts list of fields to be transformed to string
     * @param \Cake\Database\Query $query The query that is being compiled
     * @param \Cake\Database\ValueBinder $binder Value binder used to generate parameter placeholder
     * @return string
     */
    protected function _buildHavingPart($parts, $query, $binder)
    {
        $selectParts = $query->clause('select');

        foreach ($selectParts as $selectKey => $selectPart) {
            if (!$selectPart instanceof FunctionExpression) {
                continue;
            }
            foreach ($parts as $k => $p) {
                if (!is_string($p)) {
                    continue;
                }
                preg_match_all(
                    '/\b' . trim($selectKey, '"') . '\b/i',
                    $p,
                    $matches
                );

                if (empty($matches[0])) {
                    continue;
                }

                $parts[$k] = preg_replace(
                    ['/"/', '/\b' . trim($selectKey, '"') . '\b/i'],
                    ['', $selectPart->sql($binder)],
                    $p
                );
            }
        }

        return sprintf(' HAVING %s', implode(', ', $parts));
    }
}