speedBB/app/Http/Controllers/ForumController.php

<?php

namespace App\Http\Controllers;

use App\Models\Forum;
use App\Models\Post;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class ForumController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $query = Forum::query()
            ->withoutTrashed()
            ->withCount(relations: ['threads', 'posts'])
            ->withSum(relation: 'threads', column: 'views_count');

        $parentParam = $request->query(key: 'parent');
        if (is_array(value: $parentParam) && array_key_exists('exists', $parentParam)) {
            $exists = filter_var(value: $parentParam['exists'], filter: FILTER_VALIDATE_BOOLEAN, options: FILTER_NULL_ON_FAILURE);
            if ($exists === false) {
                $query->whereNull(columns: 'parent_id');
            } elseif ($exists === true) {
                $query->whereNotNull(columns: 'parent_id');
            }
        } elseif (is_string(value: $parentParam)) {
            $parentId = $this->parseIriId(value: $parentParam);
            if ($parentId !== null) {
                $query->where(column: 'parent_id', operator: $parentId);
            }
        }

        if ($request->filled(key: 'type')) {
            $query->where(column: 'type', operator: $request->query(key: 'type'));
        }

        $forums = $query
            ->orderBy(column: 'position')
            ->orderBy(column: 'name')
            ->get();

        $forumIds = $forums->pluck('id')->all();
        $lastPostByForum = $this->loadLastPostsByForum($forumIds);

        $payload = $forums->map(
            fn (Forum $forum) => $this->serializeForum($forum, $lastPostByForum[$forum->id] ?? null)
        );

        return response()->json($payload);
    }

    public function show(Forum $forum): JsonResponse
    {
        $forum->loadCount(['threads', 'posts'])
            ->loadSum('threads', 'views_count');
        $lastPost = $this->loadLastPostForForum($forum->id);
        return response()->json($this->serializeForum($forum, $lastPost));
    }

    public function store(Request $request): JsonResponse
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:100'],
            'description' => ['nullable', 'string'],
            'type' => ['required', Rule::in(['category', 'forum'])],
            'parent' => ['nullable', 'string'],
        ]);

        $parentId = $this->parseIriId($data['parent'] ?? null);

        if ($data['type'] === 'forum' && !$parentId) {
            return response()->json(['message' => 'Forums must belong to a category.'], 422);
        }

        if ($parentId) {
            $parent = Forum::findOrFail($parentId);
            if ($parent->type !== 'category') {
                return response()->json(['message' => 'Parent must be a category.'], 422);
            }
        }

        if ($parentId === null) {
            Forum::whereNull('parent_id')->increment('position');
            $position = 0;
        } else {
            $position = Forum::where('parent_id', $parentId)->max('position');
        }

        $forum = Forum::create([
            'name' => $data['name'],
            'description' => $data['description'] ?? null,
            'type' => $data['type'],
            'parent_id' => $parentId,
            'position' => ($position ?? 0) + 1,
        ]);

        $forum->loadCount(['threads', 'posts'])
            ->loadSum('threads', 'views_count');
        $lastPost = $this->loadLastPostForForum($forum->id);

        return response()->json($this->serializeForum($forum, $lastPost), 201);
    }

    public function update(Request $request, Forum $forum): JsonResponse
    {
        $data = $request->validate([
            'name' => ['sometimes', 'required', 'string', 'max:100'],
            'description' => ['nullable', 'string'],
            'type' => ['sometimes', Rule::in(['category', 'forum'])],
            'parent' => ['nullable', 'string'],
        ]);

        $parentId = $this->parseIriId($data['parent'] ?? null);
        $nextType = $data['type'] ?? $forum->type;
        $nextParentId = array_key_exists('parent', $data) ? $parentId : $forum->parent_id;

        if ($nextType === 'forum' && !$nextParentId) {
            return response()->json(['message' => 'Forums must belong to a category.'], 422);
        }

        if (array_key_exists('parent', $data)) {
            if ($parentId) {
                $parent = Forum::findOrFail($parentId);
                if ($parent->type !== 'category') {
                    return response()->json(['message' => 'Parent must be a category.'], 422);
                }
            }
            $forum->parent_id = $parentId;
        }

        if (array_key_exists('name', $data)) {
            $forum->name = $data['name'];
        }

        if (array_key_exists('description', $data)) {
            $forum->description = $data['description'];
        }

        if (array_key_exists('type', $data)) {
            $forum->type = $data['type'];
        }

        $forum->save();

        $forum->loadCount(['threads', 'posts'])
            ->loadSum('threads', 'views_count');
        $lastPost = $this->loadLastPostForForum($forum->id);

        return response()->json($this->serializeForum($forum, $lastPost));
    }

    public function destroy(Request $request, Forum $forum): JsonResponse
    {
        $forum->deleted_by = $request->user()?->id;
        $forum->save();
        $forum->delete();

        return response()->json(null, 204);
    }

    public function reorder(Request $request): JsonResponse
    {
        $data = $request->validate([
            'parentId' => ['nullable'],
            'orderedIds' => ['required', 'array'],
            'orderedIds.*' => ['integer'],
        ]);

        $parentId = $data['parentId'] ?? null;
        if ($parentId === '' || $parentId === 'null') {
            $parentId = null;
        } elseif ($parentId !== null) {
            $parentId = (int) $parentId;
        }

        foreach ($data['orderedIds'] as $index => $forumId) {
            Forum::where('id', $forumId)
                ->where('parent_id', $parentId)
                ->update(['position' => $index + 1]);
        }

        return response()->json(['status' => 'ok']);
    }

    private function parseIriId(?string $value): ?int
    {
        if (!$value) {
            return null;
        }

        if (preg_match('#/forums/(\d+)$#', $value, $matches)) {
            return (int) $matches[1];
        }

        if (is_numeric($value)) {
            return (int) $value;
        }

        return null;
    }

    private function serializeForum(Forum $forum, ?Post $lastPost): array
    {
        return [
            'id' => $forum->id,
            'name' => $forum->name,
            'description' => $forum->description,
            'type' => $forum->type,
            'parent' => $forum->parent_id ? "/api/forums/{$forum->parent_id}" : null,
            'position' => $forum->position,
            'threads_count' => $forum->threads_count ?? 0,
            'posts_count' => $forum->posts_count ?? 0,
            'views_count' => (int) ($forum->threads_sum_views_count ?? 0),
            'last_post_at' => $lastPost?->created_at?->toIso8601String(),
            'last_post_user_id' => $lastPost?->user_id,
            'last_post_user_name' => $lastPost?->user?->name,
            'last_post_user_rank_color' => $lastPost?->user?->rank?->color,
            'last_post_user_group_color' => $this->resolveGroupColor($lastPost?->user),
            'created_at' => $forum->created_at?->toIso8601String(),
            'updated_at' => $forum->updated_at?->toIso8601String(),
        ];
    }

    private function loadLastPostsByForum(array $forumIds): array
    {
        if (empty($forumIds)) {
            return [];
        }

        $posts = Post::query()
            ->select('posts.*', 'threads.forum_id as forum_id')
            ->join('threads', 'posts.thread_id', '=', 'threads.id')
            ->whereIn('threads.forum_id', $forumIds)
            ->whereNull('posts.deleted_at')
            ->whereNull('threads.deleted_at')
            ->orderByDesc('posts.created_at')
            ->with(['user.rank', 'user.roles'])
            ->get();

        $byForum = [];
        foreach ($posts as $post) {
            $forumId = (int) ($post->forum_id ?? 0);
            if ($forumId && !array_key_exists($forumId, $byForum)) {
                $byForum[$forumId] = $post;
            }
        }

        return $byForum;
    }

    private function loadLastPostForForum(int $forumId): ?Post
    {
        return Post::query()
            ->select('posts.*')
            ->join('threads', 'posts.thread_id', '=', 'threads.id')
            ->where('threads.forum_id', $forumId)
            ->whereNull('posts.deleted_at')
            ->whereNull('threads.deleted_at')
            ->orderByDesc(column: 'posts.created_at')
            ->with(relations: ['user.rank', 'user.roles'])
            ->first();
    }

    private function resolveGroupColor(?User $user): ?string
    {
        if (!$user) {
            return null;
        }

        $roles = $user->roles;
        if (!$roles) {
            return null;
        }

        foreach ($roles->sortBy(callback: 'name') as $role) {
            if (!empty($role->color)) {
                return $role->color;
            }
        }

        return null;
    }
}