<?php

namespace App\Livewire;

use App\Livewire\Concerns\WithFleetContext;
use App\Models\AuditEvent;
use Livewire\Attributes\Layout;
use Livewire\Attributes\Title;
use Livewire\Component;

#[Layout('layouts.app')]
#[Title('Clusev — Dashboard')]
class Dashboard extends Component
{
    use WithFleetContext;

    /** Mock systemd units for the active server (until the SSH layer). */
    public array $services = [];

    public function mount(): void
    {
        $this->services = [
            ['name' => 'nginx.service',        'status' => 'online',  'desc' => 'A high performance web server',   'cpu' => 1.4, 'mem' => 128],
            ['name' => 'mariadb.service',      'status' => 'online',  'desc' => 'MariaDB 11 database server',       'cpu' => 3.8, 'mem' => 612],
            ['name' => 'redis-server.service', 'status' => 'online',  'desc' => 'Advanced key-value store',         'cpu' => 0.6, 'mem' => 44],
            ['name' => 'php8.3-fpm.service',   'status' => 'warning', 'desc' => 'PHP 8.3 FastCGI Process Manager',  'cpu' => 6.1, 'mem' => 320],
            ['name' => 'fail2ban.service',     'status' => 'offline', 'desc' => 'Ban hosts with auth errors',       'cpu' => 0,   'mem' => 0],
        ];
    }

    /** Deterministic wavy series around a base — seeds the sparklines/chart. */
    private function series(float $base, int $n = 40, float $amp = 9): array
    {
        $out = [];
        for ($i = 0; $i < $n; $i++) {
            $v = $base + sin($i / 3.0) * $amp + sin($i / 6.5) * ($amp * 0.55) + cos($i / 2.0) * 2;
            $out[] = (int) max(2, min(98, round($v)));
        }

        return $out;
    }

    /** @param  array<int,int>  $series */
    private function trend(array $series, string $suffix = '%'): array
    {
        $cur = (int) (end($series) ?: 0);
        $prev = (int) ($series[max(0, count($series) - 8)] ?? $cur);
        $d = $cur - $prev;

        return [
            'dir' => $d > 1 ? 'up' : ($d < -1 ? 'down' : 'flat'),
            'text' => ($d >= 0 ? '+' : '').$d.$suffix,
        ];
    }

    public function render()
    {
        $active = $this->activeServer();
        $cpu = (int) ($active?->cpu ?? 0);
        $mem = (int) ($active?->mem ?? 0);
        $disk = (int) ($active?->disk ?? 0);

        $cpuSeries = $this->series(max(8, $cpu), 40, 10);
        $memSeries = $this->series(max(8, $mem), 40, 7);
        $diskSeries = $this->series(max(4, $disk), 40, 2);
        $loadSeries = $this->series(max(8, (int) round($cpu * 0.8)), 40, 12);

        return view('livewire.dashboard', [
            'active' => $active,
            'cpu' => $cpu,
            'mem' => $mem,
            'disk' => $disk,
            'load' => round($cpu / 100 * 3.2, 2),
            'cpuSeries' => $cpuSeries,
            'memSeries' => $memSeries,
            'diskSeries' => $diskSeries,
            'loadSeries' => $loadSeries,
            'cpuTrend' => $this->trend($cpuSeries),
            'memTrend' => $this->trend($memSeries),
            'diskTrend' => $this->trend($diskSeries),
            'loadTrend' => $this->trend($loadSeries, ''),
            'events' => AuditEvent::with('server')->latest()->limit(6)->get(),
        ]);
    }
}