"""RTC Time"""
import gc
from time import *
from machine import RTC
import usocket as socket
import ustruct as struct

# NTP_DELTA (date(2000, 1, 1) - date(1900, 1, 1)).days * 24*60*60
NTP_DELTA   = 3155673600
_weekdayname = ("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")
_monthname = (None, "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",)

def ntptime(host="pool.ntp.org", utc=28800):
    NTP_QUERY = bytearray(48)
    NTP_QUERY[0] = 0x1B
    addr = socket.getaddrinfo(host, 123)[0][-1]
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        s.settimeout(1)
        res = s.sendto(NTP_QUERY, addr)
        msg = s.recv(48)
    finally:
        del addr
        s.close()
    gc.collect()
    val = struct.unpack("!I", msg[40:44])[0]
    return gmtime(val - NTP_DELTA + utc)

# There's currently no timezone support in MicroPython, and the RTC is set in UTC time.
def settime(times):
    if isinstance(times, str): 
        try:
            times = eval(times)
        except:
            raise ValueError("Clock information format error, use ',' to separate at least 6 numerical values")
    if type(times) in (tuple, list):
        if 6 <= len(times) <= 8:
            RTC().datetime((times[0], times[1], times[2], 0, times[3], times[4], times[5], 0))
        else:
            raise ValueError("Settime needs a type of length 6~8")

def strtime(times=None):
    if times is None:
        times = localtime()
    if isinstance(times, str):
        try:
            times = eval(times)
        except:
            raise ValueError("Clock information format error, use ',' to separate at least 6 numerical values")
    if type(times) in (tuple, list):
        if 6 <= len(times) <= 8:
            return '{0:04d}-{1:02d}-{2:02d} {3:02d}:{4:02d}:{5:02d}'.format(*times)
        else:
            raise ValueError("Settime needs a type of length 6~8")

def rfc1123_time(times=None, utc=28800):
    if times is None:
        times = localtime()
    if isinstance(times, str):
        try:
            times = eval(times)
        except:
            raise ValueError("Clock information format error, use ',' to separate at least 6 numerical values")
    if type(times) in (tuple, list):
        if 6 <= len(times) <= 8:
            times = localtime(mktime(times) - utc)
            return '{0}, {1:02d} {2} {3:04d} {4:02d}:{5:02d}:{6:02d} GMT'.format(_weekdayname[times[6]], times[2], _monthname[times[1]], times[0], times[3], times[4], times[5])
        else:
            raise ValueError("Settime needs a type of length 6~8")