<?php

namespace App\Livewire\Versions;

use Livewire\Attributes\Layout;
use Livewire\Attributes\Title;
use Livewire\Component;

/**
 * Version & releases page. Everything shown here is real: the version comes from
 * config, the build hash is read from .git at runtime, and the changelog is the
 * project's own CHANGELOG.md. There is no in-app updater (Clusev ships as a Docker
 * image) — the page states the actual update path instead of faking one.
 */
#[Layout('layouts.app')]
#[Title('Version — Clusev')]
class Index extends Component
{
    public ?string $lastChecked = null;

    /** Honest "check": there is no release server yet — report the real status. */
    public function checkUpdates(): void
    {
        $this->lastChecked = now()->format('H:i');
        $this->dispatch('notify', message: 'Entwicklungsversion — kein Release-Kanal konfiguriert.');
    }

    /** Resolve the current commit from .git without needing the git binary. */
    private function build(): array
    {
        $root = base_path('.git');
        $head = @file_get_contents($root.'/HEAD');

        if ($head === false) {
            return ['sha' => null, 'branch' => config('clusev.channel')];
        }

        $head = trim($head);

        if (! str_starts_with($head, 'ref: ')) {
            return ['sha' => substr($head, 0, 7), 'branch' => config('clusev.channel')];
        }

        $ref = substr($head, 5);
        $branch = preg_replace('#^refs/heads/#', '', $ref);
        $sha = @file_get_contents($root.'/'.$ref);

        if ($sha === false) {
            // packed-refs fallback
            foreach (preg_split('/\R/', (string) @file_get_contents($root.'/packed-refs')) as $line) {
                if (str_ends_with(trim($line), ' '.$ref)) {
                    $sha = explode(' ', trim($line))[0];
                    break;
                }
            }
        }

        return ['sha' => $sha ? substr(trim($sha), 0, 7) : null, 'branch' => $branch];
    }

    /**
     * Parse CHANGELOG.md into dated groups for the timeline.
     *
     * @return array<int, array{date:string, items:array<int, array{type:string, text:string}>}>
     */
    private function changelog(): array
    {
        $path = base_path('CHANGELOG.md');
        if (! is_file($path)) {
            return [];
        }

        $groups = [];
        $date = null;

        foreach (preg_split('/\R/', (string) file_get_contents($path)) as $line) {
            if (preg_match('/^###\s+(.+)$/', $line, $m)) {
                $date = trim($m[1]);
                $groups[$date] = [];

                continue;
            }
            if ($date !== null && preg_match('/^-\s*(\w+)\s*·\s*(.+)$/u', trim($line), $m)) {
                $groups[$date][] = ['type' => strtolower($m[1]), 'text' => trim($m[2])];
            }
        }

        $out = [];
        foreach ($groups as $d => $items) {
            if ($items !== []) {
                $out[] = ['date' => $d, 'items' => $items];
            }
        }

        return $out;
    }

    public function render()
    {
        return view('livewire.versions.index', [
            'version' => config('clusev.version'),
            'channel' => config('clusev.channel'),
            'repository' => config('clusev.repository'),
            'license' => config('clusev.license'),
            'build' => $this->build(),
            'groups' => $this->changelog(),
        ]);
    }
}