<?php

namespace App\Http\Controllers;

use App\Models\ForumPost;
use App\Models\ForumTopic;
use App\Models\ForumThread;
use Illuminate\Http\Request;

class ForumPostController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        // Not needed as posts are displayed within topics
        return redirect()->route('forum.index');
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create(Request $request)
    {
        $topic_id = $request->query('topic_id');
        if (!$topic_id) {
            return redirect()->route('forum.index')
                ->with('error', 'Topic ID is required to create a post.');
        }

        $topic = ForumTopic::findOrFail($topic_id);
        $thread = $topic->thread;

        // Check if thread is locked
        if ($thread->is_locked) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'This thread is locked. You cannot create new posts.');
        }

        return view('forum.posts.create', compact('topic', 'thread'));
    }

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

        $topic = ForumTopic::findOrFail($validated['topic_id']);
        $thread = $topic->thread;

        // Check if thread is locked
        if ($thread->is_locked) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'This thread is locked. You cannot create new posts.');
        }

        // Create the post
        $post = new ForumPost();
        $post->topic_id = $validated['topic_id'];
        $post->user_id = auth()->id();
        $post->content = $validated['content'];
        $post->save();

        // Update topic and thread last activity
        $topic->last_activity_at = now();
        $topic->save();

        $thread->last_activity_at = now();
        $thread->save();

        return redirect()->route('forum.topics.show', $topic)
            ->with('success', 'Post created successfully.');
    }

    /**
     * Display the specified resource.
     */
    public function show(ForumPost $post)
    {
        // Redirect to the topic with an anchor to the post
        return redirect()->route('forum.topics.show', $post->topic) . '#post-' . $post->id;
    }

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

        $topic = $post->topic;
        $thread = $topic->thread;

        // Check if thread is locked
        if ($thread->is_locked) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'This thread is locked. You cannot edit posts.');
        }

        return view('forum.posts.edit', compact('post', 'topic', 'thread'));
    }

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

        $topic = $post->topic;
        $thread = $topic->thread;

        // Check if thread is locked
        if ($thread->is_locked) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'This thread is locked. You cannot edit posts.');
        }

        $validated = $request->validate([
            'content' => 'required|string',
        ]);

        // Update the post
        $post->content = $validated['content'];
        $post->edited_at = now();
        $post->save();

        return redirect()->route('forum.topics.show', $topic)
            ->with('success', 'Post updated successfully.');
    }

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

        $topic = $post->topic;
        $thread = $topic->thread;

        // Check if thread is locked
        if ($thread->is_locked) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'This thread is locked. You cannot delete posts.');
        }

        // Check if this is the only post in the topic
        if ($topic->posts()->count() <= 1) {
            return redirect()->route('forum.topics.show', $topic)
                ->with('error', 'Cannot delete the only post in a topic. Delete the topic instead.');
        }

        $post->delete();

        return redirect()->route('forum.topics.show', $topic)
            ->with('success', 'Post deleted successfully.');
    }
}