import json
import os

from django.core.management.base import BaseCommand
from django.conf import settings

from ...render import compose, render


class Command(BaseCommand):
    help = 'generate symlinks to clips and clips.json'

    def add_arguments(self, parser):
        parser.add_argument('--prefix', action='store', dest='prefix', default="/srv/t_for_time", help='prefix to build clips in')
        parser.add_argument('--duration', action='store', dest='duration', default="150", help='target duration in seconds')
        parser.add_argument('--offset', action='store', dest='offset', default="1024", help='inital offset in pi')

    def handle(self, **options):
        prefix = options['prefix']
        target = int(options['duration'])
        base = int(options['offset'])

        with open(os.path.join(prefix, "clips.json")) as fd:
            clips = json.load(fd)
        scene = compose(clips, target=target, base=base)
        render(prefix, scene)
        with open(os.path.join(prefix, 'scene-%s.json' % base), 'w') as fd:
            json.dump(scene, fd, indent=2, ensure_ascii=False)