import pandas as pd
from sklearn.metrics import confusion_matrix, ConfusionMatrixDisplay, roc_curve, auc
import matplotlib.pyplot as plt

def plot_confusion_matrix(true_labels, predictions, label_names):
    for normalize in [None, 'true']:
      cm = confusion_matrix(true_labels, predictions, normalize=normalize)
      cm_disp = ConfusionMatrixDisplay(cm,  display_labels=label_names)
      cm_disp.plot(cmap="Blues")


def plot_roc_curve_IF(true_labels, scores):
    fpr, tpr, thr = roc_curve(true_labels, -scores, pos_label=-1)
    auc_score = auc(fpr, tpr)

    plt.figure()
    plt.plot(fpr, tpr, '-')
    plt.text(0.5, 0.5, f'AUC: {auc_score:.4f}')
    plt.xlabel('False positive rate')
    plt.ylabel('True positive rate')
    plt.show()