utils.py

import matplotlib.pyplot as plt
import numpy as np
from io import BytesIO
import base64

cheating_scores = []

def plot_cheating_graph():
    fig, ax = plt.subplots()
    ax.plot(cheating_scores, color='red', label='Cheating Score')
    ax.set_xlabel("Time")
    ax.set_ylabel("Cheating Probability")
    ax.set_title("Live Cheating Detection Graph")
    ax.legend()
    buf = BytesIO()
    plt.savefig(buf, format='png')
    buf.seek(0)
    encoded = base64.b64encode(buf.read()).decode('utf-8')
    plt.close(fig)
    return f"data:image/png;base64,{encoded}"

def update_score(cheating):
    score = 1 if cheating else 0
    cheating_scores.append(score)
    if len(cheating_scores) > 50:
        cheating_scores.pop(0)