#!/bin/bash

# Script for mass video encoding with ffmpeg

DEF='\e[0m'; RED='\e[31m'; GRN='\e[32m'; WHT='\e[37m'; BLD='\e[1m';

ScriptName=$(echo "$0" | awk -F '/' '{print $NF;}')
ScriptDir=$(dirname $(readlink -e "$0"))

ExtRegex='.*\(mkv\|mp4\|wmv\|avi\)'
RateAbbr="ntsc|pal|qntsc|qpal|sntsc|spal|film|ntsc-film"
CopyACodec="FLAC|vorbis|flac"

FFmpeg=$(which 'ffmpeg')
Wrapper=$(which 'x264-10bit')

Priority=""
Nice=""
Jobs=""
WriteLog=""
LogDir="Logs"
Log="/dev/null"

Resolution=""
OutputDir=""
InputDir=""
BitDepth=""
Bitrate=""
Audio=""
VCodec=""
Format=""
Fps=""

view_help ()
{
	echo "Usage: ./$ScriptName [KEY]... [ARG]..."
	echo "This is script for mass video encoding to libx264/mkv with custom bitdepth, bitrate, resolution and fps."
	echo "-i, --input       set the input directory (required)"
	echo "-o, --output      set output directory (required)"
	echo "-d, --depth       set bit depth (8 or 10)"
	echo "-r, --resolution  set resolution (<Width>x<Height>)"
	echo "-f, --fps         set fps (\"http://ffmpeg.org/ffmpeg-all.html#Video-rate\")"
	echo "-b, --bitrate     set bitrate (integer value with \"k\" or \"m\" postfix)"
	echo "-p, --priority    set priority (integer value from -19 to 20. Transferred to \"nice -n\")"
	echo "-l, --log         creates a directory with logs in output directory"
	echo "-h, --help        shows this page and exit"

	exit 1
}

check_args ()
{
	local Errors=""

	# InputDir
	if [[ -z "$InputDir" ]]; then 
		echo -e "${BLD}${RED}Error:${DEF} InputDir not set."; Errors="True"
	elif [[ -d "$InputDir" ]]; then
		InputDir=$(readlink -e "$InputDir")
		if [[ $(find "$InputDir" -maxdepth 1 -type f -regex "$ExtRegex" | wc -l) == '0' ]]; then
			echo -e "${BLD}${RED}Error:${DEF} $InputDir does not contain any video files."; Errors="True"
		fi
	else
		echo -e "${BLD}${RED}Error:${DEF} $Input not a directory."; Errors="True"
	fi

	# OutputDir
	if [[ -z "$OutputDir" ]]; then 
		echo -e "${BLD}${RED}Error:${DEF} OutputDir not set."; Errors="True"
	elif [[ -d "$OutputDir" ]]; then
		OutputDir=$(readlink -e "$OutputDir")
	elif ! mkdir -p "$OutputDir"; then
		echo -e "${BLD}${RED}Error:${DEF} Can't create ${OutputDir}!"; Errors="True"
	else
		OutputDir=$(readlink -e "$OutputDir")
	fi

	# BitDepth
	if [[ (! -z "$BitDepth") && ("$BitDepth" != '8' && "$BitDepth" != '10') ]]; then
		echo -e "${BLD}${RED}Error:${DEF} BitDepth must be '8' or '10', not \"${BitDepth}\"."; Errors="True"
	fi

	# Resolution
	if ! echo "$Resolution" | grep -Po '^[0-9]+x[0-9]+$' &> /dev/null && [[ ! -z $Resolution ]]; then
		echo -e "${BLD}${RED}Error:${DEF} Unknown resolution format: \"$Resolution\".\n\tMust be: <widht>x<height>"; Errors="True"
	fi

	# Fps
	if ! echo "$Fps" | grep -Po "^([0-9]+(/[0-9]+)?|${RateAbbr})$" &> /dev/null && [[ ! -z $Fps ]]; then
		echo -e "${BLD}${RED}Error:${DEF} Unknown fps format: \"$Fps\".\n\tIt has to be a string in the format frame_rate_num/frame_rate_den, an integer number, a float number or a valid video frame rate abbreviation"; Errors="True"
	fi

	# Bitrate
	if ! echo "$Bitrate" | grep -Po '^[0-9]+(k|m)?$' &> /dev/null && [[ ! -z $Bitrate ]]; then
		echo -e "${BLD}${RED}Error:${DEF} Unknown bitrate format: \"$Bitrate\".\n\tMust be integer value (with 'k' or 'm' postfix)."; Errors="True"
	fi

	# Priority
	if [[ ! -z "$Priority" ]]; then
		if ! echo "$Priority" | grep -P '[-0-9]{1,3}' &> /dev/null; then
			echo -e "${BLD}${RED}Error:${DEF} Unknown priority: \"$Priority\".\n\tMust be integer value from -19 to 20."; Errors="True"
		elif [[ "$Priority" -lt "-19" || "$Priority" -gt "20" ]]; then
			echo -e "${BLD}${RED}Error:${DEF} Priority must be from -19 to 20."; Errors="True"
		else
			Nice="nice -n $Priority"
		fi
	fi

	# Jobs
	#if [[ ! -z "$Jobs" ]]; then
	#	if ! echo "$Jobs" | grep -P '^[0-9]+$' &> /dev/null; then
	#		echo -e "${BLD}${RED}Error:${DEF} Unknown jobs count: \"$Jobs\".\n\tMust be integer value from 1 to 99."; Errors="True"
	#	elif [[ "$Jobs" -lt "1" ]]; then
	#		echo -e "${BLD}${RED}Error:${DEF} Jobs count must be integer value from 1 to 99."; Errors="True"
	#	else
	#		Jobs="-threads $Jobs"
	#	fi
	#fi

	# VCodec/Format
	VCodec="libx264"
	Format="matroska"

	if [[ ! -z $Errors ]]; then exit 3; fi
}

auto_exec ()
{
	local Info="$1"
	local Depth="8"
	local Exec="$FFmpeg"

	if [[ -z "$BitDepth" && ! -z $(echo "$Info" | grep -Po 'High 10') ]]; then
		Depth='10'
	else
		Depth="$BitDepth"
	fi

	if [[ "$Depth" == "10" ]]; then
		Exec="$Wrapper $Exec"
	fi
	echo "$Exec"
}

auto_resolution ()
{
	local Info="$1"

	if [[ -z "$Resolution" ]]; then
		echo "-s "$(echo "$Info" | sed -r 's/.+ ([0-9]+x[0-9]+)[, ].+/\1/g')
	else
		echo "-s $Resolution"
	fi
}

auto_fps ()
{
	local Info="$1"

	if [[ -z "$Fps" ]] && echo "$Info" | grep -P '[0-9\.] fps' &> /dev/null; then
		Fps=$(echo "$Info" | sed -r 's/.+ ([0-9\.]+) fps.+/\1/g')
	fi

	if [[ ! -z "$Fps" ]]; then
		Fps="-r $Fps"
	fi
	
	echo "$Fps"
}

auto_bitrate ()
{
	local Info="$1"

	if [[ -z "$Bitrate" ]]; then
		echo "-b:v "$(echo "$Info" | sed -r 's/.+bitrate: ([0-9]+) ([kmg]?).+/\1\2/g')
	else
		echo "-b:v $Bitrate"
	fi
}

auto_audio ()
{
	local Info="$1"
	local Arg="-acodec"
	local Codec="copy"
	local Bitrate=""
	
	if ! echo "$Info" | grep -Po "($CopyACodec)"; then
		Codec="libvorbis"
		Bitrate=$(echo "$Info" | sed -r 's/.+ ([0-9]+) kb\/s.*/\1/g' | grep -Po '[0-9]+ kb/s')
		if ! [[ -z $Bitrate ]]; then
			if [[ $Bitrate -lt 128 ]]; then
				Bitrate="128"
			fi
			Bitrate="-b:a ${Bitrate}k"
		fi
	fi

	echo "$Arg $Codec $Bitrate"
}

# Check FFmpeg and Wrapper
if [[ -z "$FFmpeg" ]]; then
	echo -e "${BLD}${RED}Error:${DEF} ffmpeg not found."; exit 1
fi
if [[ -z "$Wrapper" ]]; then
	echo -e "${BLD}${RED}Error:${DEF} 10bit wrapper not found."; exit 1
fi

# Processing arguments
while [[ $# -gt 0 ]]; do case $1 in

	-i|--input      ) InputDir="$2"   ; shift; shift;;
	-o|--output     ) OutputDir="$2"  ; shift; shift;;
	-d|--depth      ) BitDepth="$2"   ; shift; shift;;
	-r|--resolution ) Resolution="$2" ; shift; shift;;
	-f|--fps        ) Fps="$2"        ; shift; shift;;
	-b|--bitrate    ) Bitrate="$2"    ; shift; shift;;
	-p|--priority   ) Priority="$2"   ; shift; shift;;
	-l|--log        ) WriteLog="True" ;        shift;;
	-h|--help       ) view_help       ;        shift;;
#	-j|--jobs       ) Jobs="$2"       ; shift; shift;;
#	-a|--acodec     ) ACodec="$2"     ; shift; shift;;
#	-v|--vcodec     ) VCodec="$2"     ; shift; shift;;
  
     *) echo "Unknown argument: \"$1\""; exit 2;;

esac; done; check_args

LogDir="$OutputDir/$LogDir"
if [[ ! -z $WriteLog && ! -d "$LogDir" ]]; then
	mkdir "$LogDir"
fi

# Main
Index='1'
Count=$(find "$InputDir" -maxdepth 1 -type f -regex "$ExtRegex" | wc -l)

while IFS= read -r -d $'\n' InputFile <&3
do
	InputFileName=$(echo "$InputFile" | awk -F '/' '{print $NF;}')
	InputFileNameCrop=$(echo "$InputFileName" | sed -r 's/\.[a-Z0-9]+$//g')

	printf "${BLD}[----] %#3d/%-3d${DEF} %s" "$Index" "$Count" "$InputFileNameCrop"

	OutputFile="$OutputDir/$InputFileNameCrop.mkv"

	if [[ ! -z $WriteLog ]]; then
		Log="$LogDir/$InputFileNameCrop.log"
	fi

	InfoP1=$("$FFmpeg" -i "$InputFile" 2>&1 | grep 'Video:')
	InfoP2=$("$FFmpeg" -i "$InputFile" 2>&1 | grep 'bitrate')
	InfoP3=$("$FFmpeg" -i "$InputFile" 2>&1 | grep -P 'Stream #0:1.+Audio:')

	Exec=$(auto_exec "$InfoP1")	

	# Uncomment for fast debug:
	# VCodec="copy"
	# For metadata:
	# -metadata:s:v language="jpn" -metadata:s:a language="jpn" \

	if $Nice $Jobs $Exec    \
	-i "$InputFile"          \
	-f "$Format"              \
	-vcodec "$VCodec"          \
	$(auto_audio "$InfoP3")     \
	$(auto_resolution "$InfoP1") \
	$(auto_bitrate "$InfoP2")     \
	$(auto_fps "$InfoP3")          \
	-y "$OutputFile" &> "$Log"; then
		printf "\r${BLD}[${GRN}DONE${DEF}${BLD}]\n"
	else
		printf "\r${BLD}[${RED}FAIL${DEF}${BLD}]\n"
		#break
	fi
	((Index++))
done 3< <(find "$InputDir" -maxdepth 1 -type f -regex "$ExtRegex")