<?php

/**
 * @package: patterns
 *
 * @author: Yevhen Odynets
 *
 * @date: 2025-07-02
 *
 * @time: 22:30
 */

declare(strict_types = 1);

namespace RefactoringGuru\Builder\RealWorld\singleton;

use RuntimeException;

use function in_array;
use function sprintf;

use const FILE_APPEND;
use const PHP_EOL;

class Logger implements Loggable
{
    public const string LOG_FILE = '../storage/logs/main.txt';
    public const array ALLOWED_LOG_TYPES
        = [
            'file',
            'error_log',
        ];
    private static ?Logger $instance = null;
    private ?string $logType = null;
    private ?string $dateFormat = null;
    private ?string $prefix = null;

    private function __construct() {}

    public static function getInstance(): static
    {
        if (self::$instance) {
            self::$instance = new static();
        }

        return self::$instance;
    }

    public function getLogType(): string
    {
        if (! $this->logType) {
            throw new RuntimeException('log type is null');
        }

        return $this->logType;
    }

    /**
     * @return $this
     */
    public function setLogType(string $logType): static
    {
        if (! in_array($logType, self::ALLOWED_LOG_TYPES)) {
            throw new RuntimeException('undefined log type: ' . $logType);
        }

        $this->logType = $logType;

        return $this;
    }

    public function log(string $data): void
    {
        $prefix = $this->getPrefix();

        $message = sprintf(
            '%s: %s%s',
            date($this->getDateFormat()),
            empty($prefix) ? '' : $prefix . ' ',
            $data . PHP_EOL
        );

        if ('file' === $this->logType) {
            file_put_contents(self::LOG_FILE, $message, FILE_APPEND);
        } elseif ('error_log' === $this->logType) {
            /* @noinspection ForgottenDebugOutputInspection */
            error_log($message, 3, self::LOG_FILE);
        }
    }

    public function getPrefix(): ?string
    {
        return $this->prefix;
    }

    /**
     * @return $this
     */
    public function setPrefix(?string $prefix): static
    {
        $this->prefix = $prefix;

        return $this;
    }

    public function getDateFormat(): string
    {
        if (! $this->dateFormat) {
            throw new RuntimeException('date format is null');
        }

        return $this->dateFormat;
    }

    /**
     * @return $this
     */
    public function setDateFormat(string $dateFormat): static
    {
        $this->dateFormat = $dateFormat;

        return $this;
    }

    private function __clone() {}
}


///*$message = 'Message from delivery service';
//
//$logger = new Logger();
//$dateFormat = 'Y-m-d H:i:s' . (preg_match('/^win/i', PHP_OS) ? '' : '.u');
//$logger->setDateFormat($dateFormat)->setLogType('error_log');
//$logger->log($message);*/