Added quiz features

app/Models/Question.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Question extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'quiz_id',
+        'subject_id',
+        'question_text',
+        'type',
+        'score',
+        'solution_explanation',
+        'order',
+    ];
+
+    protected $casts = [
+        'score' => 'float',
+        'order' => 'integer',
+    ];
+
+    public function quiz()
+    {
+        return $this->belongsTo(Quiz::class, 'quiz_id');
+    }
+
+    public function subject()
+    {
+        return $this->belongsTo(QuizSubject::class, 'subject_id');
+    }
+
+    public function options()
+    {
+        return $this->hasMany(QuestionOption::class, 'question_id');
+    }
+
+    public function userAnswers()
+    {
+        return $this->hasMany(UserQuizAnswer::class, 'question_id');
+    }
+}

app/Models/QuestionOption.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class QuestionOption extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'question_id',
+        'option_text',
+        'is_correct',
+    ];
+
+    protected $casts = [
+        'is_correct' => 'boolean',
+    ];
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+}

app/Models/Quiz.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Quiz extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'category_id',
+        'title',
+        'slug',
+        'year',
+        'type',
+        'duration_minutes',
+        'has_negative_score',
+        'is_free',
+        'is_published',
+        'description',
+    ];
+
+    protected $casts = [
+        'year' => 'integer',
+        'duration_minutes' => 'integer',
+        'has_negative_score' => 'boolean',
+        'is_free' => 'boolean',
+        'is_published' => 'boolean',
+    ];
+
+    public function category()
+    {
+        return $this->belongsTo(QuizCategory::class, 'category_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'quiz_id')->orderBy('order');
+    }
+
+    public function attempts()
+    {
+        return $this->hasMany(UserQuizAttempt::class, 'quiz_id');
+    }
+}

app/Models/QuizCategory.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class QuizCategory extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'title',
+        'slug',
+        'description',
+        'is_active',
+    ];
+
+    protected $casts = [
+        'is_active' => 'boolean',
+    ];
+
+    public function quizzes()
+    {
+        return $this->hasMany(Quiz::class, 'category_id');
+    }
+}

app/Models/QuizSubject.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class QuizSubject extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'title',
+        'slug',
+    ];
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'subject_id');
+    }
+}

app/Models/UserQuizAnswer.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class UserQuizAnswer extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'attempt_id',
+        'question_id',
+        'selected_option_id',
+        'text_answer',
+        'is_correct',
+        'earned_score',
+        'reviewer_feedback',
+    ];
+
+    protected $casts = [
+        'is_correct' => 'boolean',
+        'earned_score' => 'float',
+    ];
+
+    public function attempt()
+    {
+        return $this->belongsTo(UserQuizAttempt::class, 'attempt_id');
+    }
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+
+    public function selectedOption()
+    {
+        return $this->belongsTo(QuestionOption::class, 'selected_option_id');
+    }
+}

app/Models/UserQuizAttempt.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class UserQuizAttempt extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'quiz_id',
+        'started_at',
+        'completed_at',
+        'total_score',
+        'correct_answers',
+        'wrong_answers',
+        'unanswered',
+        'status',
+    ];
+
+    protected $casts = [
+        'started_at' => 'datetime',
+        'completed_at' => 'datetime',
+        'total_score' => 'float',
+        'correct_answers' => 'integer',
+        'wrong_answers' => 'integer',
+        'unanswered' => 'integer',
+    ];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class, 'user_id');
+    }
+
+    public function quiz()
+    {
+        return $this->belongsTo(Quiz::class, 'quiz_id');
+    }
+
+    public function answers()
+    {
+        return $this->hasMany(UserQuizAnswer::class, 'attempt_id');
+    }
+}