#!/usr/bin/python3
from glob import glob
import os
import json
import shutil
import subprocess
import sys

def get_videoduration(video):
    cmd = [
        'ffprobe',
        '-show_format',
        '-show_chapters',
        '-show_streams',
        '-print_format', 'json',
        '-i', video
    ]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout, stdin = p.communicate()
    data = json.loads(stdout.decode())
    duration = float([s for s in data['streams'] if 'width' in s][0]['duration']) - 70/60
    return '%0.3f' % duration

def is_new(xml, mp4):
    if not os.path.exists(mp4):
        return True
    vtime = os.path.getmtime(mp4)
    xtime = max(
        os.path.getmtime(xml),
        os.path.getmtime('text.html'),
        os.path.getmtime('encode.py'),
        os.path.getmtime('DRONES.json'),
        os.path.getmtime('VOCALS.json'),
    )
    return vtime < xtime

def encode(xml, force=False):
    audio_xml = xml.replace('.xml', '.audio.xml')
    vocals_xml = xml.replace('.xml', '.vocals.xml')
    mp4 = xml.replace('.xml', '.mp4')
    mp4_480p = mp4.replace('.mp4', '.480p.mp4')
    video = mp4 + '.v.mov'
    amix = mp4 + '.amix.mp4'
    audio = mp4 + '.wav'
    vocals = mp4 + '.vocals.wav'
    silence = 'silence_mono.wav'
    left = video + '_left.wav'
    right = video + '_right.wav'

    public_mp4 = 'public/' + mp4.split('/')[-1][0].lower() + mp4.split('/')[-2] + '.1080p.mp4'
    public_mp4_480p = public_mp4.replace('.1080p.mp4', '.480p.mp4')

    if force or is_new(xml, public_mp4):
        cmd = [
            'qmelt', xml, '-consumer',
            'avformat:' + video,
            'vcodec=libx264',
            'acodec=pcm_s16le'
        ]
        subprocess.call(cmd)
        duration = get_videoduration(video)
        cmd = [
            'ffmpeg', '-y', '-i', video,
            '-map_channel', '0.1.0', left,
            '-map_channel', '0.1.1', right,
        ]
        subprocess.call(cmd)
        cmd = [
            'qmelt', vocals_xml, '-consumer',
            'avformat:' + vocals,
            'acodec=pcm_s16le',
            'ac=1'
        ]
        subprocess.call(cmd)
        cmd = [
            'ffmpeg', '-y',
            '-i', left,    # FL
            '-i', right,   # FR
            '-i', vocals,  # FC
            '-i', silence, # LFE
            '-i', vocals,  # BL
            '-i', vocals,  # BR
            '-filter_complex',
            '[0:0][1:0][2:0][3:0][4:0][5:0] amerge=inputs=6[aout]',
            '-map', "[aout]",
            '-strict', '-2',
            '-c:a', 'aac',
            amix
        ]
        subprocess.call(cmd)
        os.unlink(left)
        os.unlink(right)
        os.unlink(vocals)

        cmd = [
            'ffmpeg', '-y',
            '-i', video,
            '-i', amix,
            '-t', duration,
            '-c:a', 'copy',
            '-c:v', 'copy',
            '-map', '0:v:0', '-map', '1:a:0',
            '-movflags', '+faststart',
            mp4
        ]
        subprocess.call(cmd)
        os.unlink(video)
        os.unlink(amix)
        cmd = [
            'ffmpeg', '-y',
            '-i', mp4,
            '-c:a', 'copy',
            '-vf', 'scale=854:480',
            '-c:v', 'libx264',
            '-preset', 'medium',
            '-b:v', '750k',
            '-profile:v', 'high',
            '-movflags', '+faststart',
            mp4_480p
        ]
        subprocess.call(cmd)
        shutil.move(mp4, public_mp4)
        shutil.move(mp4_480p, public_mp4_480p)

def encode_all():
    for xml in sorted(glob('output/*/*.xml')):
        parts = xml.split('.')
        if len(parts) > 2 and parts[-2] in (
            'audio',
            'drones',
            'music',
            'source',
            'vocals',
        ):
            continue
        encode(xml)

if __name__ == '__main__':
    if len(sys.argv) == 2:
        encode(sys.argv[1], True)
    else:
        encode_all()