from django.db import models
from .exam_model import Exam
from .tag_model import Tag


class Question(models.Model):
    exam = models.ForeignKey(Exam, on_delete=models.CASCADE, related_name='questions', null=True, blank=True)
    file_path = models.CharField(max_length=500, unique=True)
    text = models.TextField()
    correct_answer = models.CharField(max_length=50)  # Support multi-select answers like "A,B,C"
    file_mtime = models.FloatField(null=True, blank=True)  # Track file modification time
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    tags = models.ManyToManyField(Tag, blank=True, related_name='questions')

    # Question type field
    question_type = models.CharField(
        max_length=20,
        default='mcq',
        choices=[
            ('mcq', 'Multiple Choice'),
            ('scq', 'Single Choice'),
            ('matching', 'Matching'),
            ('textalternativ', 'Text Alternative'),
            ('textfält', 'Text Field'),
        ]
    )

    # JSON field for matching questions
    matching_data = models.JSONField(
        null=True,
        blank=True,
        help_text="JSON data for matching questions: {left_items: [...], top_items: [...], correct_pairs: [[0,1], [1,2], ...]}"
    )

    def __str__(self):
        return self.text[:50]