import json
import random

class QCMTool:
    def __init__(self, json_file):
        """
        Initialize the QCM tool with a JSON file containing questions.
        """
        self.json_file = json_file
        self.questions = self.load_questions()

    def load_questions(self):
        """
        Load questions from the JSON file.
        """
        with open(self.json_file, 'r') as file:
            questions = json.load(file)
        return questions

    def pick_random_question(self):
        """
        Pick a random question from the loaded questions.
        """
        return random.choice(self.questions)

    def check_answer(self, question, user_answer):
        """
        Check if the user's answer is correct and provide an explanation.
        """
        if user_answer == question["correct_answer"]:
            return True, question["explanation"]
        else:
            return False, question["explanation"]

    def run(self):
        """
        Run the QCM tool: pick a question, ask the user, and check the answer.
        """
        question = self.pick_random_question()
        print("Question:", question["question"])
        for i, option in enumerate(question["options"], 1):
            print(f"{chr(64 + i)}. {option}")  # Use 'A', 'B', 'C', 'D' instead of numbers

        user_answer = input("Your answer (enter the option letter, e.g., A, B, C, D): ").strip().upper()
        try:
            # Map user input (A, B, C, D) to the corresponding option index
            option_index = ord(user_answer) - 65  # Convert 'A' to 0, 'B' to 1, etc.
            if 0 <= option_index < len(question["options"]):
                selected_option = question["options"][option_index]
                is_correct, explanation = self.check_answer(question, selected_option)
                if is_correct:
                    print("Correct! 🎉")
                else:
                    print("Incorrect! 😞")
                print("Explanation:", explanation)
            else:
                print("Invalid option letter. Please try again.")
        except (ValueError, IndexError):
            print("Invalid input. Please enter a valid option letter (A, B, C, D).")


qcm_tool = QCMTool('info/questions.json')

# Run the QCM tool
qcm_tool.run()