<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;

class InteractionController extends Controller
{
    /**
     * Comment and/or rate an item in a single request.
     * Body: { content?: string, stars?: int (1-5) }
     * - content → adds a comment
     * - stars   → sets/updates this user's rating
     * At least one is required.
     */
    public function store(Request $request, $type, $id)
    {
        $data = $request->validate([
            'content' => 'nullable|string|max:1000',
            'stars' => 'nullable|integer|min:1|max:5',
        ]);

        if (!$request->filled('content') && !$request->filled('stars')) {
            throw ValidationException::withMessages([
                'content' => ['Provide a comment (content) and/or a rating (stars).'],
            ]);
        }

        $model = $this->getModel($type, $id);
        if (!$model) {
            return response()->json(['message' => 'Item not found'], 404);
        }

        $comment = null;
        if ($request->filled('content')) {
            $comment = $model->comments()->create([
                'user_id' => auth()->id(),
                'content' => $data['content'],
            ])->load('user');
        }

        $rating = null;
        if ($request->filled('stars')) {
            $rating = $model->ratings()->updateOrCreate(
                ['user_id' => auth()->id()],
                ['stars' => $data['stars']]
            );
        }

        $model = $model->fresh();

        return response()->json([
            'message' => 'Interaction saved successfully',
            'comment' => $comment,
            'your_rating' => $rating?->stars,
            'average_rating' => $model->average_rating,
            'ratings_count' => $model->ratings_count,
            'comments_count' => $model->comments_count,
        ]);
    }

    private function getModel($type, $id)
    {
        // media, music and playlist all support comments + ratings.
        $models = [
            'music' => \App\Models\Music::class,
            'media' => \App\Models\Media::class,
            'playlist' => \App\Models\MusicPlaylist::class,
        ];

        $class = $models[$type] ?? null;

        return $class ? $class::find($id) : null;
    }
}