<?php

namespace App\Http\Controllers;

use App\Models\ForumCategory;
use App\Models\ForumThread;
use App\Models\ForumTopic;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class ForumThreadController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        $threads = ForumThread::with(['user', 'category'])
            ->orderBy('is_sticky', 'desc')
            ->orderBy('last_activity_at', 'desc')
            ->paginate(20);

        return view('forum.threads.index', compact('threads'));
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create(Request $request)
    {
        $categories = ForumCategory::orderBy('order')->get();
        $category_id = $request->query('category_id');

        return view('forum.threads.create', compact('categories', 'category_id'));
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'title' => 'required|string|max:255',
            'content' => 'required|string',
            'category_id' => 'required|exists:forum_categories,id',
        ]);

        // Create the thread
        $thread = new ForumThread();
        $thread->title = $validated['title'];
        $thread->slug = Str::slug($validated['title']) . '-' . uniqid();
        $thread->category_id = $validated['category_id'];
        $thread->user_id = auth()->id();
        $thread->last_activity_at = now();
        $thread->save();

        // Create the initial topic
        $topic = new ForumTopic();
        $topic->thread_id = $thread->id;
        $topic->user_id = auth()->id();
        $topic->title = $validated['title'];
        $topic->content = $validated['content'];
        $topic->last_activity_at = now();
        $topic->save();

        return redirect()->route('forum.threads.show', $thread)
            ->with('success', 'Thread created successfully.');
    }

    /**
     * Display the specified resource.
     */
    public function show(ForumThread $thread)
    {
        // Increment view count
        $thread->increment('views');

        // Get topics with pagination
        $topics = $thread->topics()
            ->with('user')
            ->orderBy('is_pinned', 'desc')
            ->orderBy('created_at', 'asc')
            ->paginate(15);

        return view('forum.threads.show', compact('thread', 'topics'));
    }

    /**
     * Show the form for editing the specified resource.
     */
    public function edit(ForumThread $thread)
    {
        // Check if user is authorized to edit this thread
        if (auth()->id() !== $thread->user_id && !auth()->user()->hasRole('admin')) {
            return redirect()->route('forum.threads.show', $thread)
                ->with('error', 'You are not authorized to edit this thread.');
        }

        $categories = ForumCategory::orderBy('order')->get();
        $initialTopic = $thread->topics()->oldest()->first();

        return view('forum.threads.edit', compact('thread', 'categories', 'initialTopic'));
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, ForumThread $thread)
    {
        // Check if user is authorized to edit this thread
        if (auth()->id() !== $thread->user_id && !auth()->user()->hasRole('admin')) {
            return redirect()->route('forum.threads.show', $thread)
                ->with('error', 'You are not authorized to edit this thread.');
        }

        $validated = $request->validate([
            'title' => 'required|string|max:255',
            'content' => 'required|string',
            'category_id' => 'required|exists:forum_categories,id',
        ]);

        // Update the thread
        $thread->title = $validated['title'];
        if ($thread->isDirty('title')) {
            $thread->slug = Str::slug($validated['title']) . '-' . uniqid();
        }
        $thread->category_id = $validated['category_id'];
        $thread->save();

        // Update the initial topic
        $initialTopic = $thread->topics()->oldest()->first();
        if ($initialTopic) {
            $initialTopic->title = $validated['title'];
            $initialTopic->content = $validated['content'];
            $initialTopic->save();
        }

        return redirect()->route('forum.threads.show', $thread)
            ->with('success', 'Thread updated successfully.');
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(ForumThread $thread)
    {
        // Check if user is authorized to delete this thread
        if (auth()->id() !== $thread->user_id && !auth()->user()->hasRole('admin')) {
            return redirect()->route('forum.threads.show', $thread)
                ->with('error', 'You are not authorized to delete this thread.');
        }

        $categoryId = $thread->category_id;
        $thread->delete();

        return redirect()->route('forum.categories.show', ['category' => ForumCategory::find($categoryId)])
            ->with('success', 'Thread deleted successfully.');
    }
}