<?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         3.0.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Database\Log;

use JsonSerializable;

/**
 * Contains a query string, the params used to executed it, time taken to do it
 * and the number of rows found or affected by its execution.
 *
 * @internal
 */
class LoggedQuery implements JsonSerializable
{
    /**
     * Query string that was executed
     *
     * @var string
     */
    public $query = '';

    /**
     * Number of milliseconds this query took to complete
     *
     * @var float
     */
    public $took = 0;

    /**
     * Associative array with the params bound to the query string
     *
     * @var array
     */
    public $params = [];

    /**
     * Number of rows affected or returned by the query execution
     *
     * @var int
     */
    public $numRows = 0;

    /**
     * The exception that was thrown by the execution of this query
     *
     * @var \Exception|null
     */
    public $error;

    /**
     * Helper function used to replace query placeholders by the real
     * params used to execute the query
     *
     * @return string
     */
    protected function interpolate(): string
    {
        $params = array_map(function ($p) {
            if ($p === null) {
                return 'NULL';
            }
            if (is_bool($p)) {
                return $p ? '1' : '0';
            }

            if (is_string($p)) {
                // Likely binary data like a blob or binary uuid.
                // pattern matches ascii control chars.
                if (preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/u', '', $p) !== $p) {
                    $p = bin2hex($p);
                }

                $replacements = [
                    '$' => '\\$',
                    '\\' => '\\\\\\\\',
                    "'" => "''",
                ];

                $p = strtr($p, $replacements);

                return "'$p'";
            }

            return $p;
        }, $this->params);

        $keys = [];
        $limit = is_int(key($params)) ? 1 : -1;
        foreach ($params as $key => $param) {
            $keys[] = is_string($key) ? "/:$key\b/" : '/[?]/';
        }

        return preg_replace($keys, $params, $this->query, $limit);
    }

    /**
     * Get the logging context data for a query.
     *
     * @return array
     */
    public function getContext(): array
    {
        return [
            'numRows' => $this->numRows,
            'took' => $this->took,
        ];
    }

    /**
     * Returns data that will be serialized as JSON
     *
     * @return array
     */
    public function jsonSerialize(): array
    {
        $error = $this->error;
        if ($error !== null) {
            $error = [
                'class' => get_class($error),
                'message' => $error->getMessage(),
                'code' => $error->getCode(),
            ];
        }

        return [
            'query' => $this->query,
            'numRows' => $this->numRows,
            'params' => $this->params,
            'took' => $this->took,
            'error' => $error,
        ];
    }

    /**
     * Returns the string representation of this logged query
     *
     * @return string
     */
    public function __toString(): string
    {
        $sql = $this->query;
        if (!empty($this->params)) {
            $sql = $this->interpolate();
        }

        return $sql;
    }
}