#!/usr/bin/env python3

import time
import logging
import os
from datetime import datetime

import constants


logger = logging.getLogger(__file__)


def timestamp() -> str:
    t = datetime.fromtimestamp(time.time())
    return t.strftime("%d/%b/%Y:%H:%M:%S%Z")


def describe_age_of_file(filename: str) -> str:
    try:
        now = time.time()
        ts = os.stat(filename).st_ctime
        age = now - ts
        age = int(age)
        return describe_duration(age)
    except Exception as e:
        logger.exception(e)
        return "?????"


def describe_age_of_file_briefly(filename: str) -> str:
    try:
        now = time.time()
        ts = os.stat(filename).st_ctime
        age = now - ts
        age = int(age)
        return describe_duration_briefly(age)
    except Exception as e:
        logger.exception(e)
        return "?????"


def describe_duration(age: int) -> str:
    days = divmod(age, constants.seconds_per_day)
    hours = divmod(days[1], constants.seconds_per_hour)
    minutes = divmod(hours[1], constants.seconds_per_minute)

    descr = ""
    if days[0] > 1:
        descr = f"{int(days[0]):d} days, "
    elif days[0] == 1:
        descr = "1 day, "
    if hours[0] > 1:
        descr = descr + f"{int(hours[0]):d} hours, "
    elif hours[0] == 1:
        descr = descr + "1 hour, "
    if len(descr) > 0:
        descr = descr + "and "
    if minutes[0] == 1:
        descr = descr + "1 minute"
    else:
        descr = descr + f"{int(minutes[0]):d} minutes"
    return descr


def describe_duration_briefly(age: int) -> str:
    days = divmod(age, constants.seconds_per_day)
    hours = divmod(days[1], constants.seconds_per_hour)
    minutes = divmod(hours[1], constants.seconds_per_minute)

    descr = ""
    if days[0] > 0:
        descr = f"{int(days[0]):d}d "
    if hours[0] > 0:
        descr = descr + f"{int(hours[0]):d}h "
    descr = descr + f"{int(minutes[0]):d}m"
    return descr


def minute_number(hour: int, minute: int) -> int:
    """Convert hour:minute into minute number from start of day."""
    return hour * 60 + minute


def datetime_to_minute_number(dt: datetime) -> int:
    """Convert a datetime into a minute number (of the day)"""
    return minute_number(dt.hour, dt.minute)


def minute_number_to_time_string(minute_num: int) -> str:
    """Convert minute number from start of day into hour:minute am/pm
    string."""

    hour = minute_num // 60
    minute = minute_num % 60
    ampm = "a"
    if hour > 12:
        hour -= 12
        ampm = "p"
    if hour == 12:
        ampm = "p"
    if hour == 0:
        hour = 12
    return f"{hour:2}:{minute:02}{ampm}"


# x = describe_age_of_file_briefly("pages/clock_10_none.html")
# print x