<?php

namespace App\Console\Commands;

use App\Events\HealthUpdated;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Cache;

class CollectHealth extends Command
{
    protected $signature = 'health:collect';
    protected $description = 'Sammelt Systemmetriken und broadcastet sie';

    public function handle(): int
    {
        $system = [
            // CPU-Last (1/5/15) aus PHP
            'cpu_load_1'  => $this->loadavg(0),
            'cpu_load_5'  => $this->loadavg(1),
            'cpu_load_15' => $this->loadavg(2),

            // Kerne
            'cores'       => $this->cpuCores(),

            // RAM % + Details aus /proc/meminfo (used = MemTotal - MemAvailable)
            'ram'         => $this->ramInfo(),

            // Uptime in Sekunden aus /proc/uptime
            'uptime_seconds' => $this->uptimeSeconds(),

            // IPs aus ENV (falls gesetzt)
            'ipv4'        => env('SERVER_PUBLIC_IPV4'),
            'ipv6'        => env('SERVER_PUBLIC_IPV6'),
        ];

        // Optional: eine “CPU-%”-Schätzung aus Load(1m)/Cores (damit dein UI einen %-Wert hat)
        if (is_numeric($system['cpu_load_1']) && $system['cores'] > 0) {
            $system['cpu_percent'] = (int) round(
                100 * max(0, min(1, $system['cpu_load_1'] / $system['cores']))
            );
        }

        $meta = [
            'system'     => $system,
            'updated_at' => now()->toIso8601String(),
        ];

        Cache::put('health:meta', $meta, 60);
        event(new HealthUpdated($meta));

        $this->info('Health aktualisiert & gesendet.');
        return self::SUCCESS;
    }

    private function loadavg(int $index): ?float
    {
        $la = @sys_getloadavg();
        return (is_array($la) && isset($la[$index])) ? (float) $la[$index] : null;
    }

    private function cpuCores(): int
    {
        $n = (int) @shell_exec('nproc 2>/dev/null');
        return $n > 0 ? $n : 1;
        // Alternativ: count(preg_grep('/^processor\s*:/', @file('/proc/cpuinfo') ?: [])) ?: 1;
    }

    private function ramInfo(): array
    {
        $mem = @file('/proc/meminfo', FILE_IGNORE_NEW_LINES) ?: [];
        $kv  = [];
        foreach ($mem as $ln) {
            if (preg_match('/^(\w+):\s+(\d+)/', $ln, $m)) {
                $kv[$m[1]] = (int) $m[2]; // kB
            }
        }
        $totalKB      = $kv['MemTotal']      ?? 0;
        $availKB      = $kv['MemAvailable']  ?? 0;  // besser als “free”
        $usedKB       = max(0, $totalKB - $availKB);

        $totalGB = $totalKB / 1024 / 1024;
        $usedGB  = $usedKB  / 1024 / 1024;
        $percent = $totalKB > 0 ? (int) round(100 * $usedKB / $totalKB) : null;

        return [
            'percent'  => $percent,
            'used_gb'  => (int) round($usedGB),
            'total_gb' => (int) round($totalGB),
        ];
    }

    private function uptimeSeconds(): ?int
    {
        $s = @file_get_contents('/proc/uptime');
        if (!$s) return null;
        $parts = explode(' ', trim($s));
        return isset($parts[0]) ? (int) floor((float) $parts[0]) : null;
    }
}