#! /bin/env python3
# encoding: utf-8

import json
import os
import over
import re
import subprocess
import tempfile
import time
import pathlib # FIXME sort

from aux import Command, parse_fps

# --------------------------------------------------

prefix = over.core.textui.prefix
_print = over.core.textui.Output('over.video')

# --------------------------------------------------

command = over.core.types.ndict()
command.identify = Command('ffprobe', '-v', 'quiet', '-print_format', 'json', '-show_format', '-show_streams', 'INFILE')
command.normalize_prepass = Command('ffmpeg', '-i', 'INFILE', '-af', 'volumedetect', '-f', 'null', '/dev/null')
command.encode_theora = Command('ffmpeg', '-i', 'INFILE', '-codec:v', 'libtheora', '-qscale:v', 'VQ', '-codec:a', 'libvorbis', '-qscale:a', 'AQ', 'NORMALIZE', 'OUTFILE')
command.encode_x264 = Command('ffmpeg', '-i', 'INFILE', '-c:v', 'libx264', '-preset', 'slow', '-crf', 'VQ', '-profile:v', 'high', '-level', '4.2', '-codec:a', 'libvorbis', '-qscale:a', 'AQ', 'NORMALIZE', 'OUTFILE')
command.encode_wav = Command('ffmpeg', '-i', 'INFILE', '-codec:a', 'pcm_s16le', 'NORMALIZE', 'OUTFILE')
command.normalize = Command('-filter:a', 'VOLUME')

# --------------------------------------------------

if __name__ == '__main__':
	main = over.core.app.Main('Over-Video', '0.1', 'AWARE-Overwatch Joint Software License', '~/.over/video.cfg')
	main.add_option('profile', 'str', 'x264', 'Encoding profile to use. Available are either §mtheora§/ for Theora and Vorbis in an Ogg container, §mx264§/ for H.264 and Vorbis in an MP4 container, or §mwav§/ which just extracts audio into a wav for further processing.')
	main.add_option('video-quality', 'float', 22, 'Video encoding quality. Use 0-10 for Theora (0 being the lowest, 5-7 is generally watchable) and 0-51 for x264 (0 being lossless, 18-28 is reasonable).', short_name='v')
	main.add_option('audio-quality', 'float', 2, 'Audio encoding quality with -1 being the worst and 10 being the best.', short_name='a')
	main.add_option('normalize', 'bool', True, 'Normalize the audio track.', short_name='N')
	main.add_option('normalize-mean', 'float', -20.0, 'Target mean volume to target.', short_name='n')
	main.add_option('dump-commands', 'bool', False, 'Print ffmpeg commands that would be executed. Implies §B--no-§garmed§/. If §B--§gnormalize§/ is in effect, the normalization pre-pass will still be performed so that the proper volume correction can be computed.', short_name='D')
	main.add_option('armed', 'bool', False, 'Perform the suggested action.', short_name='A', use_cfg_file=False)
	main.enable_help('h')
	main.add_help('Description', ['Over-Video is a simple video converter.'])
	main.parse()
	
	_print('using profile §b%s§/: video_quality=%.1f, audio_quality=%.1f, normalize=%s' %(main.cfg.profile, main.cfg.video_quality, main.cfg.audio_quality, '%.1f dB' %(main.cfg.normalize_mean) if main.cfg.normalize else 'None'))
	
	if not main.targets:
		_print("no files specified", prefix.warn)
	
	for tgt in main.targets:
		print()
		
		if not os.path.exists(tgt) or os.path.isdir(tgt):
			_print('target §y%s§/ §ris not a readable file§/, skipping' %(tgt), prefix.fail)
			continue
		
		_print('processing §B%s§/' %(tgt), prefix.start)
		
		command.identify.reset()
		command.identify.INFILE = tgt
		command.identify.run()
		identify_raw = command.identify.get_all_output()
		identify_dict = json.loads(identify_raw.decode('utf-8'))
		
		info = over.core.types.ndict()
		info.duration = float(identify_dict['format']['duration'])
		
		video_streams = [s for s in identify_dict['streams'] if s['codec_type'] == 'video']
		audio_streams = [s for s in identify_dict['streams'] if s['codec_type'] == 'audio']
		
		amount_vs = len(video_streams)
		amount_as = len(audio_streams)
		
		if amount_vs != 1:
			_print('detected §r%d§/ video streams' %(amount_vs), prefix.fail)
			main.exit(1)
		
		if amount_as != 1:
			_print('detected §r%d§/ audio streams' %(amount_as), prefix.fail)
			main.exit(1)
		
		video = video_streams[0]
		audio = audio_streams[0]
		
		info.video_codec = video['codec_name']
		info.video_size_x = video['width']
		info.video_size_y = video['height']
		info.video_fps = over.core.textui.Unit(parse_fps(video['r_frame_rate']), 'Hz')
		info.video_bitrate = over.core.textui.Unit(audio['bit_rate'], 'b/s')
		
		info.audio_codec = audio['codec_name']
		info.audio_channels = audio['channels']
		info.audio_samplerate = over.core.textui.Unit(audio['sample_rate'], 'Hz')
		info.audio_language = audio['tags']['language']
		info.audio_bitrate = over.core.textui.Unit(audio['bit_rate'], 'b/s')
		
		_print('§mvideo§/: size=§b%d§/x§b%d§/ px, framerate=%s, codec=%s, bitrate=%s' %(info.video_size_x, info.video_size_y, info.video_fps, info.video_codec, info.video_bitrate))
		_print('§caudio§/: channels=§b%d§/, samplerate=%s, codec=%s, bitrate=%s, language=%s' %(info.audio_channels, info.audio_samplerate, info.audio_codec, info.audio_bitrate, info.audio_language))
		
		if (main.cfg.armed or main.cfg.dump_commands) and main.cfg.normalize:
			_print('running normalization pre-pass')
			
			command.normalize_prepass.reset()
			command.normalize_prepass.INFILE = tgt
			command.normalize_prepass.run(stderr=True)
			
			pb = over.core.textui.ProgressBar(60, int(info.video_fps.value * info.duration), 'frames')
			
			output_buffer = []
			
			while True:
				time.sleep(.25)
				
				out = command.normalize_prepass.get_output()
				
				if out:
					output_buffer.append(out)
					
					if b'frame=' in out:
						frame_id = re.findall(b'frame= *(\d+) ', out)[0]
						pb.update(int(frame_id))
				
				elif out is None:
					break
			
			output = b''.join(output_buffer)
			
			if b'mean_volume: ' in output:
				info.mean_volume = float(re.findall(b'mean_volume: (-\d+\.\d+) dB', output)[0])
				info.volume_correction = info.mean_volume - main.cfg.normalize_mean
			else:
				_print('§runexpected ffmpeg output§/, dump follows', prefix.fail, suffix=':\n')
				print(output)
				raise RuntimeError
			
			pb.blank()
			_print('detected volume %.2f dB, correction %.2f dB' %(info.mean_volume, info.volume_correction))
		
		# select encoding command
		if main.cfg.profile == 'theora':
			encode_cmd = command.encode_theora
			info.tmp_file = tempfile.mktemp(suffix='.ogv', dir='.')
		elif main.cfg.profile == 'x264':
			encode_cmd = command.encode_x264
			info.tmp_file = tempfile.mktemp(suffix='.mp4', dir='.')
		elif main.cfg.profile == 'wav':
			encode_cmd = command.encode_wav
			info.tmp_file = tempfile.mktemp(suffix='.wav', dir='.')
		else:
			_print('§runknown profile selected§/: §r%s§/' %(main.cfg.profile), prefix.fail)
			raise RuntimeError
		
		# populate its arguments
		encode_cmd.reset()
		encode_cmd.INFILE = tgt
		encode_cmd.OUTFILE = info.tmp_file
		encode_cmd.AQ = main.cfg.audio_quality
		encode_cmd.VQ = main.cfg.video_quality
		
		if main.cfg.normalize:
			command.normalize.reset()
			command.normalize.VOLUME = 'volume=%.2fdB' %(info.volume_correction)
			encode_cmd.NORMALIZE = command.normalize
		else:
			encode_cmd.NORMALIZE = None
		
		if main.cfg.dump_commands:
			_print('will execute §B%s§/' %(' '.join(encode_cmd.dump())), prefix.start)
		
		if main.cfg.armed:
			pb = over.core.textui.ProgressBar(60, int(info.video_fps.value * info.duration), 'frames')
			
			encode_cmd.run(stderr=True)
			
			while True:
				time.sleep(.25)
				
				out = encode_cmd.get_output()
				
				if out:
					if b'frame=' in out:
						frame_id = re.findall(b'frame= *(\d+) ', out)[0]
						pb.update(int(frame_id))
				
				elif out is None:
					break
			
			original_filesize = over.core.textui.Unit(pathlib.Path(tgt).stat().st_size, 'B')
			new_filesize = over.core.textui.Unit(pathlib.Path(info.tmp_file).stat().st_size, 'B')
			
			pb.blank()
			_print('encoding finished: %s -> %s' %(original_filesize, new_filesize), prefix.done)
		
		new_filename = pathlib.Path(tgt).stem + pathlib.Path(info.tmp_file).suffix
		
		if main.cfg.dump_commands:
			_print('will execute §Bmv '%s' '%s'§/' %(info.tmp_file, new_filename), prefix.start)
		
		if main.cfg.armed:
			pathlib.Path(info.tmp_file).rename(new_filename)