import os
import time
from pathlib import Path

OUTPUT_DIR = Path("outputs")
OUTPUT_DIR.mkdir(exist_ok=True)


def cleanup_outputs(max_age_hours=2):
    """
    Delete old generated videos.
    """

    now = time.time()

    for file in OUTPUT_DIR.glob("*.mp4"):
        age = now - file.stat().st_mtime

        if age > max_age_hours * 3600:
            try:
                file.unlink()
            except Exception:
                pass


def random_seed():
    import random

    return random.randint(0, 2**31 - 1)


def validate_frames(frames):

    # Wan requires 4k+1
    if frames < 5:
        frames = 5

    remainder = (frames - 1) % 4

    if remainder != 0:
        frames += 4 - remainder

    return frames


def ensure_output_dir():
    OUTPUT_DIR.mkdir(exist_ok=True)