#!/usr/bin/env python3

# ffmpeg wrapper
import ffmpy
# argument parsing
import argparse

parser = argparse.ArgumentParser(description='')

# Input file
parser.add_argument("-i", "--input-file", required=True, type=str,
                    help="Input file")

# Media title
parser.add_argument("-t", "--title", required=True, type=str,
                    help="Media title")

# Video stuff
parser.add_argument("-vc", "--video-codec", required=False, type=str,
                    help="Output video codec. Defaults to 'copy'")
parser.add_argument("-crf", "--crf", required=False, type=int,
                    help="Codec crf. No effect if video codec is 'copy'. Defaults to 20")
parser.add_argument("-vt", "--video-tune", required=False, type=str,
                    help="Video codec tune")
parser.add_argument("-vp", "--video-preset", required=False, type=str,
                    help="Video compression preset. Defaults to 'medium'")

# Audio stuff
parser.add_argument("-ac", "--audio-codec", required=False, type=str,
                    help="Output audio codec. Defaults to 'copy'")
parser.add_argument("-ab", "--audio-bitrate", required=False, type=str,
                    help="Output audio bitrate. No effect if audio codec is 'copy'. Defaults to '192k'")
parser.add_argument("-aj", "--audio-japanese", required=True, type=str,
                    help="Stream identifier for japanese audio")
parser.add_argument("-ae", "--audio-english", required=False, type=str,
                    help="Stream identifier for english audio")

# Subtitle stuff
parser.add_argument("-sn", "--subtitle-name", required=True, type=str,
                    help="Name for subtitles")
parser.add_argument("-si", "--subtitle-stream", required=True, type=str,
                    help="Stream identifier for subtitles")

# Output file
parser.add_argument("-o", "--output-file", required=True, type=str,
                    help="Output file")

# Execute or print commands
parser.add_argument("-e", "--execute", action="store_true",
                    help="Execute script. If not set, shows the commands that would be run.")

args = parser.parse_args()

title = args.title

inputfile = args.input_file

# Default video codec is copy
if args.video_codec is None:
    videocodec = "copy"
else:
    videocodec = args.video_codec

# Default crf of 20
if args.crf is None:
    crf = 20
else:
    crf = args.crf

if args.video_tune is None:
    tune = ""
else:
    tune = "-tune " + args.video_tune

if args.video_preset is None:
    preset = "medium"
else:
    preset = args.video_preset

# Default audio codec is copy
if args.audio_codec is None:
    audiocodec = "copy"
else:
    audiocodec = args.audio_codec

# Default audio codec is copy
if args.audio_bitrate is None:
    audiobitrate = "192k"
else:
    audiobitrate = args.audio_bitrate

outputfile = args.output_file

japaneseaudio = args.audio_japanese

if args.audio_english is None:
    englishaudio = ""
else:
    englishaudio = "-map " + args.audio_english

subtitle = args.subtitle_name
subtitlestream = args.subtitle_stream

execute = args.execute

ff = ffmpy.FFmpeg(inputs={inputfile:None},
                  outputs={outputfile: "-metadata title='{title}' -disposition 0"" "
                           "-c:v {videocodec} -crf {crf} {tune} -preset {preset} -map 0:v:0 -metadata:s:v:0 title='Video' -disposition:v:0 default"" "
                           "-c:a {audiocodec} -b:a {audiobitrate} -map {jpnaudiostream}? {engaudiomap}"" "
                           "-metadata:s:a:0 title='Japanese' -metadata:s:a:0 language=jpn -metadata:s:a:1 title='English' -metadata:s:a:1 language=eng -disposition:a:0 default"" "
                           "-c:s copy -map {substream} -metadata:s:s:0 title='{subtitle}' -metadata:s:s:0 language=eng -disposition:s:0 default"" "
                           .format(title=title,
                                   videocodec=videocodec,
                                   crf=crf,
                                   tune=tune,
                                   preset=preset,
                                   audiocodec=audiocodec,
                                   audiobitrate=audiobitrate,
                                   jpnaudiostream=japaneseaudio,
                                   engaudiomap=englishaudio,
                                   substream=subtitlestream,
                                   subtitle=subtitle)
                           }
                  )

if execute:
    ff.run()
else:
    print(ff.cmd)