<?php
declare(strict_types=1);

class CronHeartbeat
{
    private static function heartbeatDir(): string
    {
        return dirname(__DIR__) . '/logs/heartbeat';
    }

    public static function record(string $jobName, array $summary = []): void
    {
        $dir = self::heartbeatDir();
        if (!is_dir($dir)) {
            @mkdir($dir, 0775, true);
        }

        $data = [
            'job' => $jobName,
            'timestamp' => date('c'),
            'unix' => time(),
            'summary' => $summary,
        ];

        $file = $dir . '/' . preg_replace('/[^a-zA-Z0-9_-]/', '', $jobName) . '.json';
        @file_put_contents($file, json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT), LOCK_EX);
    }

    public static function read(string $jobName): ?array
    {
        $file = self::heartbeatDir() . '/' . preg_replace('/[^a-zA-Z0-9_-]/', '', $jobName) . '.json';
        if (!is_file($file)) {
            return null;
        }

        $raw = @file_get_contents($file);
        if (!is_string($raw) || $raw === '') {
            return null;
        }

        $data = json_decode($raw, true);
        return is_array($data) ? $data : null;
    }

    public static function readAll(): array
    {
        $dir = self::heartbeatDir();
        if (!is_dir($dir)) {
            return [];
        }

        $results = [];
        $files = @glob($dir . '/*.json');
        if (!is_array($files)) {
            return [];
        }

        foreach ($files as $file) {
            $raw = @file_get_contents($file);
            if (!is_string($raw) || $raw === '') {
                continue;
            }

            $data = json_decode($raw, true);
            if (is_array($data) && isset($data['job'])) {
                $results[(string) $data['job']] = $data;
            }
        }

        return $results;
    }
}