<?php

declare(strict_types=1);

/**
 * Read-only analyzer for nginx skinbase-performance JSON logs.
 *
 * Single file (backward compatible):
 *   php scripts/analyze-http-performance.php --file=/var/log/nginx/skinbase-performance.log --since=24h --host=skinbase.org
 *
 * Rotation-aware 24h:
 *   php scripts/analyze-http-performance.php --glob='/var/log/nginx/skinbase-performance.log*' --since=24h --host=skinbase.org
 *
 * Status:
 *   --status=404     exact HTTP 404
 *   --status=4xx     400-499
 *   --status=5xx     500-599
 */

use App\Support\Http\HttpPerformanceLogAnalyzer;
use App\Support\Http\HttpUriNormalizer;

require __DIR__.'/../vendor/autoload.php';

$files = [];
$globs = [];
$options = [
    'since' => '24h',
    'until' => null,
    'min_requests' => 1,
    'top' => 20,
    'status' => null,
    'uri' => null,
    'host' => null,
    'slow_ms' => null,
];

foreach (array_slice($argv, 1) as $arg) {
    if (! str_starts_with($arg, '--')) {
        fwrite(STDERR, "Unknown argument: {$arg}\n");
        exit(2);
    }
    [$key, $value] = array_pad(explode('=', substr($arg, 2), 2), 2, '1');
    if ($key === 'file') {
        $files[] = $value;
        continue;
    }
    if ($key === 'glob') {
        $globs[] = $value;
        continue;
    }
    $map = [
        'since' => 'since',
        'until' => 'until',
        'hours' => 'hours',
        'min-requests' => 'min_requests',
        'top' => 'top',
        'status' => 'status',
        'uri' => 'uri',
        'host' => 'host',
        'slow-ms' => 'slow_ms',
    ];
    if (! isset($map[$key])) {
        fwrite(STDERR, "Unknown option: --{$key}\n");
        exit(2);
    }
    $options[$map[$key]] = $value;
}

if (isset($options['hours']) && is_numeric($options['hours'])) {
    $options['since'] = ((int) $options['hours']).'h';
}

$analyzer = new HttpPerformanceLogAnalyzer(new HttpUriNormalizer());

$discovered = $files;
foreach ($globs as $pattern) {
    $discovered = array_merge($discovered, $analyzer->expandGlob($pattern));
}

if ($discovered === [] && $globs === []) {
    $discovered[] = '/var/log/nginx/skinbase-performance.log';
}

$discovered = $analyzer->deduplicatePaths($discovered);
if ($discovered === []) {
    fwrite(STDERR, "No matching performance log files.\n");
    exit(1);
}

foreach ($discovered as $path) {
    if (! is_readable($path)) {
        fwrite(STDERR, "Cannot read {$path}\n");
        exit(1);
    }
}

try {
    $result = $analyzer->analyze($discovered, [
        'since' => $options['since'],
        'until' => $options['until'],
        'min_requests' => (int) $options['min_requests'],
        'top' => (int) $options['top'],
        'status' => $options['status'],
        'uri' => $options['uri'],
        'host' => $options['host'],
        'slow_ms' => $options['slow_ms'] !== null ? (float) $options['slow_ms'] : null,
    ]);
} catch (InvalidArgumentException $e) {
    fwrite(STDERR, $e->getMessage()."\n");
    exit(2);
}

foreach ($result['warnings'] ?? [] as $warning) {
    fwrite(STDERR, $warning."\n");
}

echo json_encode($result, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES), PHP_EOL;