<?php

namespace App\Http\Controllers\Community;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Services\LegacyService;

class ForumController extends Controller
{
    protected LegacyService $legacy;

    public function __construct(LegacyService $legacy)
    {
        $this->legacy = $legacy;
    }

    public function index()
    {
        $data = $this->legacy->forumIndex();

        if (empty($data['topics']) || count($data['topics']) === 0) {
            try {
                $categories = \App\Models\ForumCategory::query()
                    ->withCount(['threads as num_subtopics'])
                    ->orderBy('position')
                    ->orderBy('id')
                    ->get();

                $topics = $categories->map(function ($category) {
                    $threadIds = \App\Models\ForumThread::where('category_id', $category->id)->pluck('id');

                    return (object) [
                        'topic_id' => $category->id,
                        'topic' => $category->name,
                        'discuss' => null,
                        'last_update' => \App\Models\ForumThread::where('category_id', $category->id)->max('last_post_at'),
                        'num_posts' => $threadIds->isEmpty() ? 0 : \App\Models\ForumPost::whereIn('thread_id', $threadIds)->count(),
                        'num_subtopics' => (int) ($category->num_subtopics ?? 0),
                    ];
                });

                $data['topics'] = $topics;
            } catch (\Throwable $e) {
                // keep legacy response
            }
        }

        return view('community.forum.index', $data);
    }

    public function topic(Request $request, $topic_id, $slug = null)
    {
        // Redirect to canonical slug when possible
        try {
            $thread = \App\Models\ForumThread::find((int) $topic_id);
            if ($thread && !empty($thread->slug)) {
                $correct = $thread->slug;
                if ($slug !== $correct) {
                    $qs = $request->getQueryString();
                    $url = route('legacy.forum.topic', ['topic_id' => $topic_id, 'slug' => $correct]);
                    if ($qs) $url .= '?' . $qs;
                    return redirect($url, 301);
                }
            }
        } catch (\Throwable $e) {
            // ignore
        }


        $data = $this->legacy->forumTopic((int) $topic_id, (int) $request->query('page', 1));

        if (! $data) {
            // fallback to new forum tables if migration already ran
            try {
                $thread = \App\Models\ForumThread::with(['posts.user'])->find((int) $topic_id);
                if ($thread) {
                    $posts = \App\Models\ForumPost::where('thread_id', $thread->id)->orderBy('created_at')->get();
                    $data = [
                        'type' => 'posts',
                        'thread' => $thread,
                        'posts' => $posts,
                        'page_title' => $thread->title ?? 'Forum',
                    ];
                }
            } catch (\Throwable $e) {
                // ignore and fall through to placeholder
            }
        }

        if (! $data) {
            return view('shared.placeholder');
        }

        if (isset($data['type']) && $data['type'] === 'subtopics') {
            return view('community.forum.topic', $data);
        }

        return view('community.forum.posts', $data);
    }
}