<?php
declare(strict_types=1);
namespace Butschster\ContextGenerator\Application\Logger;
use Psr\Log\LoggerTrait;
/**
* Default formatter implementation that formats log messages with timestamp,
* level indicator, and interpolates context data.
*/
final readonly class SimpleFormatter implements FormatterInterface
{
use LoggerTrait;
/**
* @param string $dateFormat The date format string for timestamps
* @param bool $includeTimestamp Whether to include timestamps in log messages
*/
public function __construct(
private string $prefix = '',
private string $dateFormat = 'Y-m-d H:i:s',
private bool $includeTimestamp = false,
) {}
/**
* Format a log message with the given level and context.
*
* @param string $level PSR-3 log level
* @param string|\Stringable $message The message to format
* @param array<string, mixed> $context Additional context data
*
* @return string The formatted message
*/
public function format(string $level, string|\Stringable $message, array $context = []): string
{
$logLevel = LogLevel::fromString($level);
$formattedMessage = (string) $message;
// Interpolate placeholders in the message
$formattedMessage = $this->interpolate($formattedMessage, $context);
// Build the complete formatted line
$parts = [];
if ($this->includeTimestamp) {
$parts[] = '[' . \date($this->dateFormat) . ']';
}
$parts[] = '[' . $logLevel->getLabel() . ']';
if (!empty($this->prefix)) {
$parts[] = '[' . $this->prefix . ']';
}
$parts[] = $formattedMessage;
return ' ' . \implode(' ', $parts);
}
public function withPrefix(string $prefix): static
{
return new self(
$prefix,
$this->dateFormat,
$this->includeTimestamp,
);
}
public function getPrefix(): string
{
return $this->prefix;
}
public function log($level, \Stringable|string $message, array $context = []): void
{
echo $this->format($level, $message, $context);
}
/**
* Interpolate context values into message placeholders.
*
* Placeholders must be in the format {key}.
*
* @param string $message The message with placeholders
* @param array<string, mixed> $context The context values to interpolate
*
* @return string The interpolated message
*/
private function interpolate(string $message, array $context): string
{
if (empty($context)) {
return $message;
}
$json = \json_encode($context, \JSON_PRETTY_PRINT);
// add indentation fo each line
$json = \preg_replace('/^/m', ' ', $json);
return $message . "\n\n" . $json . "\n";
}
/**
* Format exception details for inclusion in log messages.
*/
private function formatException(\Throwable $exception): string
{
return \sprintf(
"\nException: %s [%d]: %s at %s line %s\nStack trace:\n%s",
$exception::class,
$exception->getCode(),
$exception->getMessage(),
$exception->getFile(),
$exception->getLine(),
$exception->getTraceAsString(),
);
}
}
