<?php

namespace Modules\Exam\Models;

use App\Models\User;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class ExamAttempt extends Model
{
   use HasFactory;

   protected $fillable = [
      'user_id',
      'exam_id',
      'attempt_number',
      'start_time',
      'end_time',
      'total_marks',
      'obtained_marks',
      'correct_answers',
      'incorrect_answers',
      'is_passed',
      'status',
   ];

   protected $casts = [
      'start_time' => 'datetime',
      'end_time' => 'datetime',
      'total_marks' => 'decimal:2',
      'obtained_marks' => 'decimal:2',
      'correct_answers' => 'integer',
      'incorrect_answers' => 'integer',
      'is_passed' => 'boolean',
      'attempt_number' => 'integer',
   ];

   public function user(): BelongsTo
   {
      return $this->belongsTo(User::class);
   }

   public function exam(): BelongsTo
   {
      return $this->belongsTo(Exam::class);
   }

   public function attempt_answers(): HasMany
   {
      return $this->hasMany(ExamAttemptAnswer::class);
   }

   public function getPercentageAttribute(): float
   {
      if ($this->total_marks == 0) {
         return 0;
      }
      return ($this->obtained_marks / $this->total_marks) * 100;
   }

   public function getDurationAttribute(): ?int
   {
      if ($this->start_time && $this->end_time) {
         return $this->start_time->diffInMinutes($this->end_time);
      }
      return null;
   }
}