import random
import os
import csv
from datetime import datetime


def sample_pair(image_files):
    """Extract to random images"""
    return random.sample(image_files, 2)


def save_score(img1, img2, score):
    """Save evaluation in CSV"""
    file_exists = os.path.isfile(SCORES_FILE)

    with open(SCORES_FILE, "a", newline="") as f:
        writer = csv.writer(f)
        if not file_exists:
            writer.writerow(["timestamp", "image_1", "image_2", "score"])

        writer.writerow(
            [
                datetime.utcnow().isoformat(),
                os.path.basename(img1),
                os.path.basename(img2),
                int(score),
            ]
        )