#!/usr/bin/python3
from argparse import ArgumentParser
from concurrent.futures import ThreadPoolExecutor
import json
import os
import string
import subprocess
import sys


def render_gongs(source):
    gongs_wav = source.replace('.json', '.gongs.wav')

    render_gongs = not os.path.exists(gongs_wav)
    if not render_gongs:
        render_gongs = os.path.getmtime(source) > os.path.getmtime(gongs_wav)

    if render_gongs:
        with open(source) as fd:
            data = json.load(fd)
        duration = sum(clip['duration'] for clip in data['clips'])
        cmd = [
            # offset in pi, duration, number of tracks, target
            './render_gongs.py',
            str(data['gongs']['offset']),
            str(duration),
            str(data['gongs']['tracks']),
            gongs_wav
        ]
        print(cmd)
        subprocess.call(cmd)


if __name__ == '__main__':
    usage = "usage: %(prog)s [options] json"
    parser = ArgumentParser(usage=usage)
    parser.add_argument('-p', '--prefix', dest='prefix', help='version prefix', default='.')
    parser.add_argument('files', metavar='path', type=str, nargs='*', help='json source file')
    opts = parser.parse_args()

    files = opts.files
    if not files:
        files = []
        for n in range(10):
            for letter in string.ascii_uppercase:
                f = os.path.join(opts.prefix, 'output/%02d/%s.json' % (n, letter))
                files.append(f)

    with ThreadPoolExecutor(max_workers=4) as e:
        for f in sorted(files):
            e.submit(render_gongs, f)