#!/usr/bin/env python3

from datetime import datetime
from sys import argv

from helpers import (
    guess_language,
    read_concerts,
    split_concerts,
    tmplocale,
)


CALENDAR_LAYOUT = {
    'en': '<span id="month">%B</span><br><span id="day">%d</span>',
    'fr': '<span id="day">%d</span><br><span id="month">%B</span>',
}

INDEX_TEMPLATE = '''\
<main>
    <a id="next-concert" href="concerts.html#concert-%F">
      <p>
        {CALENDAR}
      </p>
    </a>
</main>
'''


def main(concerts_src, index_dst):
    today = datetime.fromordinal(
        datetime.today().date().toordinal()
    )
    past_concerts, next_concerts = split_concerts(
        read_concerts(concerts_src), today
    )

    concert = next_concerts[0] if next_concerts else past_concerts[-1]

    lang = guess_language(concerts_src)
    template = INDEX_TEMPLATE.format(CALENDAR=CALENDAR_LAYOUT[lang])

    with tmplocale(lang):
        index = concert.time.strftime(template)

    with open(index_dst, 'w') as index_file:
        index_file.write(index)


if __name__ == '__main__':
    main(*argv[1:])