<?php

namespace App\Http\Controllers;

use App\Models\Forum;
use App\Models\Post;
use App\Models\Thread;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

class PortalController extends Controller
{
    public function __invoke(Request $request): JsonResponse
    {
        $forums = Forum::query()
            ->withoutTrashed()
            ->withCount(['threads', 'posts'])
            ->withSum('threads', 'views_count')
            ->orderBy('position')
            ->orderBy('name')
            ->get();

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

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

        $threads = Thread::query()
            ->withoutTrashed()
            ->withCount('posts')
            ->with([
                'user' => fn ($query) => $query->withCount(['posts', 'threads'])->with(['rank', 'roles']),
                'latestPost.user.rank',
                'latestPost.user.roles',
            ])
            ->latest('created_at')
            ->limit(12)
            ->get()
            ->map(fn (Thread $thread) => $this->serializeThread($thread));

        $stats = [
            'threads' => Thread::query()->withoutTrashed()->count(),
            'posts' => Post::query()->withoutTrashed()->count(),
            'users' => User::query()->count(),
        ];

        $user = auth('sanctum')->user();

        return response()->json([
            'forums' => $forumPayload,
            'threads' => $threads,
            'stats' => $stats,
            'profile' => $user ? [
                'id' => $user->id,
                'name' => $user->name,
                'email' => $user->email,
                'avatar_url' => $user->avatar_path ? Storage::url($user->avatar_path) : null,
                'location' => $user->location,
                'rank' => $user->rank ? [
                    'id' => $user->rank->id,
                    'name' => $user->rank->name,
                    'color' => $user->rank->color,
                ] : null,
                'group_color' => $this->resolveGroupColor($user),
            ] : 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) + ($forum->threads_count ?? 0),
            'views_count' => (int) ($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 serializeThread(Thread $thread): array
    {
        return [
            'id' => $thread->id,
            'title' => $thread->title,
            'body' => $thread->body,
            'forum' => "/api/forums/{$thread->forum_id}",
            'user_id' => $thread->user_id,
            'posts_count' => ($thread->posts_count ?? 0) + 1,
            'views_count' => $thread->views_count ?? 0,
            'user_name' => $thread->user?->name,
            'user_avatar_url' => $thread->user?->avatar_path
                ? Storage::url($thread->user->avatar_path)
                : null,
            'user_posts_count' => ($thread->user?->posts_count ?? 0) + ($thread->user?->threads_count ?? 0),
            'user_created_at' => $thread->user?->created_at?->toIso8601String(),
            'user_rank_name' => $thread->user?->rank?->name,
            'user_rank_badge_type' => $thread->user?->rank?->badge_type,
            'user_rank_badge_text' => $thread->user?->rank?->badge_text,
            'user_rank_badge_url' => $thread->user?->rank?->badge_image_path
                ? Storage::url($thread->user->rank->badge_image_path)
                : null,
            'user_rank_color' => $thread->user?->rank?->color,
            'user_group_color' => $this->resolveGroupColor($thread->user),
            'last_post_at' => $thread->latestPost?->created_at?->toIso8601String()
                ?? $thread->created_at?->toIso8601String(),
            'last_post_id' => $thread->latestPost?->id,
            'last_post_user_id' => $thread->latestPost?->user_id ?? $thread->user_id,
            'last_post_user_name' => $thread->latestPost?->user?->name
                ?? $thread->user?->name,
            'last_post_user_rank_color' => $thread->latestPost?->user?->rank?->color
                ?? $thread->user?->rank?->color,
            'last_post_user_group_color' => $this->resolveGroupColor($thread->latestPost?->user)
                ?? $this->resolveGroupColor($thread->user),
            'created_at' => $thread->created_at?->toIso8601String(),
            'updated_at' => $thread->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 resolveGroupColor(?\App\Models\User $user): ?string
    {
        if (!$user) {
            return null;
        }

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

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

        return null;
    }
}