<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class QuizAttempt extends Model {
    protected $fillable = ['user_id','quiz_id','score','current_question','status','started_at','completed_at'];
    protected $casts    = ['started_at' => 'datetime', 'completed_at' => 'datetime'];
    public const POINTS = [1, 1, 2, 2, 3, 3, 4, 6, 8, 10];
    public function user()    { return $this->belongsTo(User::class); }
    public function quiz()    { return $this->belongsTo(Quiz::class); }
    public function answers() { return $this->hasMany(QuizAttemptAnswer::class); }
    public function stars(): string {
        $s = $this->score;
        if ($s >= 40) return '🌟🌟🌟🌟🌟';
        if ($s >= 30) return '⭐⭐⭐⭐';
        if ($s >= 20) return '⭐⭐⭐';
        if ($s >= 10) return '⭐⭐';
        if ($s >= 1)  return '⭐';
        return '—';
    }
}