<?php

namespace App\Http\Controllers\Api\Posts;

use App\Http\Controllers\Controller;
use App\Models\Post;
use App\Models\PostReaction;
use App\Services\Posts\PostCountersService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;

class PostReactionController extends Controller
{
    public function __construct(private PostCountersService $counters) {}

    /**
     * POST /api/posts/{id}/reactions
     * payload: { reaction: 'like' }
     */
    public function store(Request $request, int $id): JsonResponse
    {
        $user = $request->user();

        $key = 'react_post:' . $user->id;
        if (RateLimiter::tooManyAttempts($key, 60)) {
            return response()->json(['message' => 'Too many reactions. Please slow down.'], 429);
        }
        RateLimiter::hit($key, 3600);

        $post     = Post::findOrFail($id);
        $reaction = $request->input('reaction', 'like');

        $existing = PostReaction::where('post_id', $post->id)
            ->where('user_id', $user->id)
            ->where('reaction', $reaction)
            ->first();

        if ($existing) {
            return response()->json(['message' => 'Already reacted.', 'reactions_count' => $post->reactions_count], 200);
        }

        PostReaction::create([
            'post_id'  => $post->id,
            'user_id'  => $user->id,
            'reaction' => $reaction,
        ]);

        $this->counters->incrementReactions($post);
        $post->refresh();

        return response()->json(['reactions_count' => $post->reactions_count, 'viewer_liked' => true], 201);
    }

    /**
     * DELETE /api/posts/{id}/reactions/{reaction}
     */
    public function destroy(Request $request, int $id, string $reaction = 'like'): JsonResponse
    {
        $user = $request->user();
        $post = Post::findOrFail($id);

        $deleted = PostReaction::where('post_id', $post->id)
            ->where('user_id', $user->id)
            ->where('reaction', $reaction)
            ->delete();

        if ($deleted) {
            $this->counters->decrementReactions($post);
            $post->refresh();
        }

        return response()->json(['reactions_count' => $post->reactions_count, 'viewer_liked' => false]);
    }
}