import argparse
import datetime
import json
import os

# globals
mediadir = "/var/lib/ffplayout/tv-media"
playlistdir = "/var/lib/ffplayout/playlists"
channel = "newellijaytelevision"
verbose = False
from_date = datetime.date.today()
to_date = datetime.date.today()
playlist_duration = 6 * 60 * 60 # six hours, in seconds

def main():
    parse_config()
    for single_date in daterange(from_date, to_date):
        if verbose:
            print("Processing date", single_date)
        build_day(single_date)

def parse_config():
    global mediadir, playlistdir, channel, verbose, from_date, to_date, playlist_duration
    parser = argparse.ArgumentParser(
        prog="mt_clockwheel",
        description="a simple clockwheel playlist generator for ffplayout",
        epilog="brought to you by your friends at Mountain Town Technology and Community Media Network"
            )

    parser.add_argument('-d', '--directory', dest='mediadir', help='root directory for media library')
    parser.add_argument('-p', '--playlists', dest='playlistdir', help='root directory for playlists')
    parser.add_argument('-c', '--channel', dest='channel', help='channel name to generate playlists for')
    parser.add_argument('-v', '--verbose', action='store_true', help='provide verbose output logging')
    parser.add_argument('-f', '--from', dest='from_date', help='first date to generate playlist for')
    parser.add_argument('-t', '--to', dest='to_date', help='last date to generate playlist for')
    parser.add_argument('-l', '--length', dest='playlist_duration', help='duration (in seconds) for each playlist - if a factor of 24 * 60 * 60 then playlist will be duplicated to fill 24 hours')

    args = parser.parse_args()
    if args.verbose:
        verbose = True
    if args.mediadir:
        mediadir = args.mediadir
    if args.playlistdir:
        playlistdir = args.playlistdir
    if args.channel:
        channel = args.channel
    if args.from_date:
        from_date = datetime.datetime.strptime(args.from_date, "%Y-%m-%d").date()
    if args.to_date:
        to_date = datetime.datetime.strptime(args.to_date, "%Y-%m-%d").date()
    if args.playlist_duration:
        playlist_duration = args.playlist_duration

    if verbose:
        print("Arguments parsed, config:")
        print("mediadir:", mediadir)
        print("playlistdir:", playlistdir)
        print("channel:", channel)
        print("from_date:", from_date)
        print("to_date:", to_date)

def build_day(this_date):
    d = {} # empty dict that will become our JSON output

    d["channel"] = channel
    d["date"] = this_date.strftime("%Y-%m-%d")
    d["program"] = [] # empty list to populate with programs

    total_time = 0

    while total_time < playlist_duration:
        entry, length = get_playlist_entry()
        d["program"].append(entry)
        total_time += length
        if verbose:
            print('  added program:', json.dumps(entry), length)

    # TODO: see if playlist_duration is a factor of 24 * 60 * 60 and, if so, duplicate it to fill 24 hours

    if verbose:
        print("playlist json:", json.dumps(d))

def get_playlist_entry():
    entry = {
        "in": 0,
        "out": 300,
        "duration": 300,
        "source": "test.mp4"
    }

    length = entry["duration"]

    return entry, length

# generator function to yield single dates from a date range
def daterange(start_date, end_date):
    for n in range(int((end_date - start_date).days) + 1): # adding 1 to make the range inclusive
        yield start_date + datetime.timedelta(n)

if __name__ == "__main__":
    main()