#!/usr/bin/env python3

# http://inamidst.com/saxo/
# Created by Sean B. Palmer

import calendar
import datetime
import re
import time

import saxo

r_arg = re.compile("(\d{2}):(\d{2})(?::(\d{2}))?(Z|[+-]\d{1,2})(?: (.*))?")

@saxo.pipe
def main(arg):
    if not arg:
        return "Set a reminder at a certain time. Must match " + r_arg.pattern

    match = r_arg.match(arg)
    if not match:
        return "Sorry, input must match " + r_arg.pattern

    hour = int(match.group(1))
    if hour > 23:
        return "Sorry, hour must be between 0 and 23 inclusive"
    minute = int(match.group(2))
    if minute > 59:
        return "Sorry, minute must be between 0 and 59 inclusive"
    second = int(match.group(3) or 0)
    if second > 59:
        return "Sorry, second must be between 0 and 59 inclusive"

    tz = match.group(4)
    tz = 0 if (tz == "Z") else int(tz)
    if (tz > 12) or (tz < -12):
        return "Sorry, timezone must be between -12 and +12 inclusive"

    message = match.group(5)
    utcnow = datetime.datetime.utcnow()
    # print("utcnow", utcnow)
    delta = datetime.timedelta(minutes=tz * 60)
    now = utcnow + delta
    # print("now", now)
    base = datetime.datetime(
        year=now.year,
        month=now.month,
        day=now.day,
        hour=hour,
        minute=minute,
        second=second)
    # print("base", base)
    base = base - delta
    # print("base - delta", base)
    if base < utcnow:
        base += datetime.timedelta(minutes=24 * 60)
    unixtime = calendar.timegm(base.utctimetuple())

    nick = saxo.env("nick")
    sender = saxo.env("sender")

    if not (nick or sender):
        return "Sorry, couldn't set a reminder!"

    if message:
        message = nick + ": " + message
    else:
        message = nick + "!"

    args = (unixtime, "msg", (sender, message))
    saxo.client("schedule", *args)

    when = time.strftime("%d %b %Y %H:%M:%S UTC", time.gmtime(unixtime))
    return "%s: Will remind at %s" % (nick, when)