<?php

namespace KTXC\Logger;

use Psr\Log\LoggerInterface;

/**
 * Simple file-based PSR-3 logger that writes plain-text lines.
 *
 * Each entry is formatted as:
 *   2026-02-20 12:34:56.123456 message text
 */
class PlainFileLogger implements LoggerInterface
{
    private string $logFile;

    /**
     * @param string $logDir  Directory where log files are written
     * @param string $channel Logical channel name (used in filename)
     */
    public function __construct(string $logDir, string $channel = 'app')
    {
        $this->logFile = rtrim($logDir, '/') . '/' . $channel . '.log';
        $this->ensureWritablePath();
    }

    public function emergency($message, array $context = []): void { $this->log('emergency', $message, $context); }
    public function alert($message, array $context = []): void { $this->log('alert', $message, $context); }
    public function critical($message, array $context = []): void { $this->log('critical', $message, $context); }
    public function error($message, array $context = []): void { $this->log('error', $message, $context); }
    public function warning($message, array $context = []): void { $this->log('warning', $message, $context); }
    public function notice($message, array $context = []): void { $this->log('notice', $message, $context); }
    public function info($message, array $context = []): void { $this->log('info', $message, $context); }
    public function debug($message, array $context = []): void { $this->log('debug', $message, $context); }

    public function log($level, $message, array $context = []): void
    {
        $this->ensureWritablePath();

        $dt = \DateTimeImmutable::createFromFormat('U.u', sprintf('%.6F', microtime(true)));
        $timestamp = $dt?->format('Y-m-d H:i:s.u') ?? date('Y-m-d H:i:s');

        $line = $timestamp . ' ' . $this->interpolate((string) $message, $context) . PHP_EOL;

        if (@file_put_contents($this->logFile, $line, FILE_APPEND | LOCK_EX) === false) {
            error_log(sprintf('Failed to write to log file: %s', $this->logFile));
        }
    }

    private function ensureWritablePath(): void
    {
        $logDir = dirname($this->logFile);

        if (!is_dir($logDir)) {
            @mkdir($logDir, 0777, true);
        }

        if (is_dir($logDir)) {
            @chmod($logDir, 0777);
        }

        if (!file_exists($this->logFile)) {
            @touch($this->logFile);
        }

        clearstatcache(true, $this->logFile);
        if (file_exists($this->logFile)) {
            @chmod($this->logFile, 0666);
        }
    }

    private function interpolate(string $message, array $context): string
    {
        if (!str_contains($message, '{')) {
            return $message;
        }
        $replace = [];
        foreach ($context as $key => $val) {
            if (is_array($val) || (is_object($val) && !method_exists($val, '__toString'))) {
                continue;
            }
            $replace['{' . $key . '}'] = (string) $val;
        }
        return strtr($message, $replace);
    }
}