import ast
from datetime import datetime, timedelta


def checkbox(value):
    return True if value == "on" else False


def safe_int(value):
    try:
        return int(value)
    except:
        return 0


def time_to_form(date_time):
    if date_time == "~T":
        return datetime.today()
    elif date_time == "~N":
        return datetime.now()
    elif date_time == "~Y":
        return datetime.today() - timedelta(days=1)
    elif date_time == "":
        return ""
    else:
        return datetime.utcfromtimestamp(float(date_time))


def form_to_time(date_time):
    dt = ast.literal_eval(date_time)
    if dt[0] in ["~T", "~N", "~Y"]:
        return dt[0]
    else:
        dt[0] = dt[0] if dt[0] else datetime.now().strftime("%Y-%m-%d")
        dt[1] = dt[1] if dt[1] else "00:00:00"
        return datetime.strptime(" ".join(dt), "%Y-%m-%d %H:%M:%S").timestamp()