#!/bin/bash

## Define exit codes
# General config errors [10-19]
ELOAD=10
EINTERVAL=11
ENOCFG=19
# Source cofig errors [20-29]
# Destination config errors [30-49]
EFORMAT=30
ECHANNEL=31
EFMTINVPARM=49

# config structures
declare -A			\
	destinationchannels	\
	destinationcopymime	\
	destinationformat	\
	destinationfrequency	\
	destinationid		\
	destinationmaxbps	\
	destinationnormalize	\
	destinationpath		\
	destinationquality	\
	destinationrename	\
	destinationrenamepath	\
	destinationskipmime	\
|| {
	echo "Check your Bash version. You need >= 4.0" >&2
	exit $EBASHVERS
}

declare -r				\
	DOCDIR=./doc			\
	SHAREDIR=./share
declare -r				\
	exampleconf=$DOCDIR/example.cfg	\
	schema=$SHAREDIR/schema.sql	\
					\
	oldIFS="$IFS"

source $SHAREDIR/id3genres

shopt -s extglob

#parse arguments
OPTERR=0
while getopts ':c:l:T:F:hD' opt
do
	case $opt in
		c)
			cffile="$OPTARG"
		;;
		l)
			cliload="$OPTARG"
		;;
		T)
			cliltimer="$OPTARG"
		;;
		F)
			forceall+=("$OPTARG")
		;;
		h)
			help
			exit 0
		;;
		D)
			(( debug++ ))
		;;
		:)
			echo "-$OPTARG requires an argument"
			help
			exit 127
		;;
		*)
			echo "Unrecognized option: -$OPTARG"
			help
			exit 127
		;;
	esac
done

#parse config
getConfigGeneral() {
	case $key in
		'max-load')
			expr='^[0-9]*$'
			if [[ $value =~ $expr ]]
			then
				maxload="$value"
			else
				echo "Invalid max-load value: $value" >&2
				exit $ELOAD
			fi
			unset expr
		;;
		'load-interval')
			expr='^[0-9]*$'
			if [[ $value =~ $expr ]]
			then
				loadinterval="$value"
			else
				echo "Invalid load-interval value: $value" >&2
				exit $EINTERVAL
			fi
			unset expr
		;;
		'temporary-directory')
			tempdir="$value"
		;;
		'database')
			database="$value"
		;;
		debug)
			(( value > debug )) && debug=$value
		;;
	esac
}

getConfigSource() {
	case "$key" in
		'path')
			sourcepath="$value"
		;;
		'skip')
			skippeddirectories+=( "$value" )
		;;
	esac
}

getConfigDestination() {
	case "$key" in
		'path')
			destinationpath["$destination"]="$value"
		;;
		'format')
			case "$value" in
				'mp3')
					destinationformat["$destination"]=mp3
				;;
				'vorbis')
					destinationformat["$destination"]=vorbis
				;;
				*)
					echo "Unsupported destination format: $value" >2&
					exit $EFORMAT
				;;
			esac
		;;
		'quality')
			expr='^[0-9]*$'
			if ! [[ $value =~ $expr ]]
			then
				echo "Invalid quality value: $value" >&2
				exit $EQUALITY
			fi
			unset expr
			case "${destinationformat["$destination"]}" in
				'vorbis')
					destinationquality["$destination"]="$value"
				;;
				*)
					echo "$Invalid parameter \"$key\" for format \"${destinationformat["$destination"]}\"" >&2
					exit $EFMTINVPARM
				;;
			esac
		;;
		'normalize')
			case $value in
				'true'|'on'|'yes')
					destinationnormalize["$destination"]=1
				;;
				'false'|'off'|'no')
					destinationnormalize["$destination"]=0
				;;
				*)
					echo "normalize takes values:"	\
					"'yes' ,'true' ,'on', 'no', 'false',"\
					"'off'"
				;;
			esac
		;;
		'bitrate')
			expr='^[0-9]*$'
			if ! [[ $value =~ $expr ]]
			then
				echo "Invalid bitrate value: $value" >&2
				exit $EQUALITY
			fi
			unset expr
			case "${destinationformat["$destination"]}" in
				'mp3')
					destinationquality["$destination"]="$value"
				;;
				*)
					echo "$Invalid parameter \"$key\" for format \"${destinationformat["$destination"]}\"" >&2
					exit $EFMTINVPARM
				;;
			esac
		;;
		'channels')
			expr='^[0-9]*$'
			if ! [[ $value =~ $expr ]]
			then
				echo "Invalid channel count: $value" >&2
				exit $ECHANNEL
			fi
			unset expr
			destinationchannels["$destination"]=$value
		;;
		'frequency')
			expr='^[0-9]*$'
			if ! [[ $value =~ $expr ]]
			then
				echo "Invalid frequency value: $value" >&2
				exit $ECHANNEL
			fi
			unset expr
			destinationfrequency["$destination"]=$value
		;;
		'rename')
			case "$value" in
				*/*)
					destinationrenamepath["$destination"]="${value%/*}"
				;;
			esac
			destinationrename["$destination"]="${value##*/}"
		;;
		'skip_mime-type')
			destinationskipmime[$destination]="${destinationskipmime[$destination]:+${destinationskipmime[$destination]}|}$value"
		;;
		'copy_mime-type')
			destinationcopymime[$destination]="${destinationcopymime[$destination]:+${destinationcopymime[$destination]}|}$value"
		;;
		'higher-than')
			expr='^[0-9]*$'
			if ! [[ $value =~ $expr ]]
			then
				echo "Invalid higher-than bitrate value: $value" >&2
				exit $EMAXBPS
			fi
			unset expr
			destinationmaxbps[$destination]="$value"
		;;
	esac
}
getConfig() {
	while read key value
	do
		case $key in
			'#'*)
				#comment
			;;
			'')
				#empty line
			;;
			'[general]')
				context=General
			;;
			'[source]')
				context=Source
			;;
			\[*\])
				context=Destination
				destination="${key#[}"
				destination="${destination%]}"
			;;
			*)
				getConfig$context
			;;
		esac
	done < ~/.atom/atom.cfg
}

#check sanity

openDatabase() {
	if [ ! -d "$tempdir" ]
	then
		mkdir -p "$tempdir"
	fi
	rm -f "$tempdir"/sqlite.{in,out}
	mkfifo "$tempdir"/sqlite.{in,out}
	if [ ! -f "$database" ]
	then
		if [ ! -d "${database%/*}" ]
		then
			mkdir -p "${database%/*}"
		fi
		sqlite3 "$database" < $schema
	fi
	sqlite3 -bail "$database"	\
		< "$tempdir/sqlite.in"	\
		> "$tempdir/sqlite.out"	&
	exec 3> "$tempdir"/sqlite.in
	exec 4< "$tempdir"/sqlite.out
	if (( debug > 2 ))
	then
		exec 5>&3
		exec 3> >(tee -a $tempdir/debug.log >&5)
	fi
	echo 'PRAGMA foreign_keys = ON;' >&3
}

closeDatabase() {
	echo .quit >&3
	(( debug )) && echo -n "Waiting for SQLite to terminate... "
	wait
	(( debug )) && echo OK
	exec 3>&-
	exec 4<&-
	rm "$tempdir"/sqlite.{in,out}
}

Select() {
#Select table [col1 [col2 [..]]] <	WHERE_key WHERE_operator WHERE_value
#					[WHERE_key WHERE_operator WHERE_value
#					[…]]
	local			\
		table="$1"	\
		col		\
		columns		\
		operator	\
		results		\
		where_statement
	shift
	for col
	do
		(( ${#columns} )) && columns+=','
		columns+="$col"
	done
	while read key operator value
	do
		(( ${#where_statement} )) && where_statement+=( "AND" )
		where_statement+=( "$key $operator "'"'"${value//\"/\"\"}"'"' )
	done
	echo	"SELECT IFNULL("				\
			"(SELECT $columns FROM $table"		\
				"WHERE ${where_statement[@]})"	\
			",'SQL::Select:not found'"		\
		");" >&3
	read -u 4 results
	if ! [[ $results == "SQL::Select:not found" ]]
	then
		echo "$results"
	else
		return 1
	fi
}
Insert() {
#Insert table [no_id] <	key value
#			[key value
#			[…]]
	local			\
		table="$1"	\
		no_id="${2:-0}"	\
		insert_keys	\
		insert_values	\
		results
	while read key value
	do
		(( ${#insert_keys} )) && insert_keys+=","
		insert_keys+='`'"$key"'`'
		(( ${#insert_values} )) && insert_values+=","
		case $value in
			'NULL')
				insert_values+="NULL"
			;;
			+([0-9])?(.+([0-9])))
				insert_values+=$value
			;;
			*)
				insert_values+='"'"${value//\"/\"\"}"'"'
			;;
		esac
	done
	echo	"INSERT INTO $table"				\
				"( $insert_keys )"		\
			"VALUES"				\
				"( $insert_values );" >&3
	(( no_id )) || {
		echo 'SELECT LAST_INSERT_ROWID();' >&3
		read -u 4 results
		echo "$results"
	}
}
Update(){
#Update table set_key set_value [set_key set_value […]] <	where_key where_operator where_value
#								[where_key where_operator where_value
#								[…]]
	local			\
		table="$1"	\
		key		\
		argument	\
		operator	\
		value		\
		set_statement	\
		where_keys	\
		where_values	\
		what		\
		where_statement	\
		results
	shift
	what=key
	for argument
	do
		case $what in
			key)
				set_statement="${set_statement:+${set_statement},}\`$argument\`"
				what=value
			;;
			value)
				case $argument in
					'NULL')
						set_statement+=" = NULL"
					;;
					+([0-9])?(.+([0-9])))
						set_statement+=" = $argument"
					;;
					*)
						set_statement+=" = "'"'"${argument//\"/\"\"}"'"'
					;;
				esac
				what=key
			;;
		esac
	done
	while read key operator value
	do
		(( ${#where_statement} )) && where_statement+=( "AND" )
		case $value in
			'NULL')
				where_statement+=( "$key is NULL" )
			;;
			+([0-9.]))
				where_statement+=( "$key $operator $value" )
			;;
			*)
				where_statement+=( "$key $operator "'"'"${value//\"/\"\"}"'"' )
			;;
		esac
	done
	echo	"UPDATE '$table' SET"		\
			"$set_statement"	\
		"WHERE"				\
			"${where_statement[@]}"	\
		";" >&3
}
InsertIfUnset() {
#InsertIfUnset table [no_id] < key value \n key value
	local			\
		table="$1"	\
		no_id="${2:-0}"	\
		column		\
		key		\
		keys		\
		results		\
		value		\
		values
	while read key value
	do
		keys+=( "$key" )
		values+=( "$value" )
	done
	if (( no_id ))
	then
		column="${keys[0]}"
	else
		column='id'
	fi
	if ! results=$(
		Select "$table" "$column" < <(
			for key in ${!keys[@]}
			do
				echo "${keys[$key]}" = "${values[$key]}"
			done
		)
	)
	then
		results=$(
			Insert "$table" < <(
				for key in ${!keys[@]}
				do
					echo "${keys[$key]}" "${values[$key]}"
				done
			)
		)
	fi
	echo "$results"
}
InsertOrUpdate() {
#InsertOrUpdate table set_key set_value [set_key set_value […]] <	where_key where_value
#									[where_key where_value
#									[…]]
	local			\
		table="$1"	\
		argument	\
		key		\
		keys		\
		set_keys	\
		set_values	\
		value		\
		values		\
		what		\
		results
	shift
	what=key
	for argument
	do
		case $what in
			key)
				set_keys+=( "$argument" )
				what=value
			;;
			value)
				set_values+=( "$argument" )
				what=key
			;;
		esac
	done
	while read key value
	do
		keys+=( "$key" )
		values+=( "$value" )
	done
	if results=$(
		Select "$table" ${keys[0]} < <(
			for key in ${!keys[@]}
			do
				echo "${keys[$key]}" = "${values[$key]}"
			done
		)
	)
	then
		Update "$table" "$@" < <(
			for key in ${!keys[@]}
			do
				echo "${keys[$key]}" = "${values[$key]}"
			done
		)
	else
		results=$(
			Insert "$table" < <(
				for key in ${!set_keys[@]}
				do
					echo "${set_keys[$key]}" "${set_values[$key]}"
				done
				for key in ${!keys[@]}
				do
					echo "${keys[$key]}" "${values[$key]}"
				done
			)
		)
	fi
	echo "$results"
}
Delete() {
#Delete table <	where_key where_operator where_value
#		[where_key where_operator where_value
#		[…]]
	local			\
		table="$1"	\
		key		\
		operator	\
		value		\
		where_statement	\
		results
	while read key operator value
	do
		(( ${#where_statement} )) && where_statement+=( "AND" )
		if [[ $value == NULL ]]
		then
			where_statement+=( "$key is NULL" )
		else
			where_statement+=( "$key $operator "'"'"${value//\"/\"\"}"'"' )
		fi
	done
	echo "DELETE from $table WHERE ${where_statement[@]};" >&3
}

createDestinations() {
	for destination in ${!destinationpath[@]}
	do
		if ! [ -d "${destinationpath["$destination"]}" ]
		then
			if ! mkdir -p "${destinationpath["$destination"]}"
			then
				echo "$destination: Could not create ${destinationpath["$destination"]}!"
				exit $EINVDEST
			fi
		fi
		destinationid["$destination"]=$(
			InsertIfUnset destinations <<<"name $destination"
		)
	done
}

progressSpin() {
	case $(( ++count % 40 )) in
		0) echo -ne '\b|' ;;
		10) echo -ne '\b/' ;;
		20) echo -en '\b-' ;;
		30) echo -ne '\b\\' ;;
		*) ;;
	esac
}
getFiles() {
	scantime=$(date +%s)
	for prune_expression in "${skippeddirectories[@]}"
	do
		prunes+="-path $sourcepath$prune_expression -prune -o "
	done
	echo -n "Scanning $sourcepath...  "
	# We probably have thousands of files, don't waste time on disk writes
	echo 'BEGIN TRANSACTION;' >&3
	while read time size filename
	do
		if ! Select source_files id >/dev/null <<-EOWhere
				filename = $filename
				mime_type > 0
				last_change = $time
			EOWhere
		then
			mimetype=$(file -b --mime-type "$sourcepath/$filename")
			mimetypeid=$(
				InsertIfUnset mime_types <<-EOInsert
					mime_text $mimetype
				EOInsert
			)
			InsertOrUpdate source_files	\
				last_change $time	\
				size $size		\
				last_seen $scantime	\
				mime_type $mimetypeid	\
				>/dev/null		\
			<<-EOWhere
				filename $filename
			EOWhere
			(( ++new ))
			if (( new % 1000 == 0 ))
			then
				echo 'COMMIT;BEGIN TRANSACTION;' >&3
				(( debug ))	\
				&& echo -ne "\bCommitted $count files...  "
			fi
		else
			Update source_files last_seen $scantime <<-EOWhere
				filename = $filename
			EOWhere
		fi
		progressSpin
	done < <(
		find "$sourcepath" $prunes -type f -printf "%T@ %s %P\n"
	)
	echo 'COMMIT;' >&3
	echo -e "\r${count:-0} files found, ${new:=0} new or changed."
	unset count
}

updateMimes() {
	Update mime_actions action 1 <<<"action != 1"
	for destination in ${!destinationskipmime[@]}
	do
		IFS='|'
		for mime_type in ${destinationskipmime["$destination"]}
		do
			IFS="$oldIFS"
			Update mime_type_actions action 0 >/dev/null < <(
				cat <<-EOWhere
					destination_id = ${destinationid["$destination"]}
					mime_text LIKE ${mime_type//\*/%}
				EOWhere
			)
		done
	done
	for destination in ${!destinationcopymime[@]}
	do
		IFS='|'
		for mime_type in ${destinationcopymime["$destination"]}
		do
			IFS="$oldIFS"
			Update mime_type_actions action 2 >/dev/null < <(
				cat <<-EOWhere
					destination_id = ${destinationid["$destination"]}
					mime_text LIKE ${mime_type//\*/%}
				EOWhere
			)
		done
	done
}

removeObsoleteFiles() {
	Delete source_files <<-EOWhere
		last_seen < $scantime
	EOWhere
}

getRateChannelSoxi() {
	rate=$(soxi -r "$sourcepath/$filename" 2>/dev/null)
	channels=$(soxi -c "$sourcepath/$filename" 2>/dev/null)
}

getRateChannelMPC() {
	while read key value garbage
	do
		case $key in
			'samplerate:')
				rate=$value
			;;
			'channels:')
				channels=$value
			;;
		esac
	done < <(
		mpcdec "$sourcepath/$filename" -i 2>&1
	)
}

gettag() {
	echo -e "$infos"			\
	| sed -n "/^${1}=/I{s/^${1}=//I;p;q}"
}

getInfosMP3_version='ID3-1'
tagreaders+=( "$getInfosMP3_version" )
getInfos::MP3() {
	tagreader="$getInfosMP3_version"
	infos=$(
		soxi "$sourcepath/$filename" 2>/dev/null	\
		| sed 's/ *: /=/'
	)
	album=$(gettag album)
	artist=$(gettag artist)
	genre=$(gettag genre)
	title=$(gettag title)
	tracknum=$(gettag tracknumber)
	year=$(gettag year)
	expr='^[0-9]*$'
	if [[ $genre =~ $expr ]]
	then
		genre="${id3genres[$genre]}"
	fi
	infos="${infos//: /=}"
	channels=$(gettag channels)
	rate=$(gettag 'sample rate')
	bitrate=$(gettag 'bit rate')
	bitrate=${bitrate%%.*}
	bitrate=${bitrate%k}
}

getInfosOgg_version='Ogg-1'
tagreaders+=( "$getInfosOgg_version" )
getInfos::Ogg() {
	tagreader="$getInfosOgg_version"
	infos=$(
		ogginfo "$sourcepath/$filename"	\
		| sed 's/\t//'
	)
	albumartist=$(gettag albumartist)
	album=$(gettag album)
	artist=$(gettag artist)
	composer=$(gettag composer)
	disc=$(gettag discnumber)
	genre=$(gettag genre)
	performer=$(gettag performer)
	title=$(gettag title)
	tracknum=$(gettag tracknumber)
	tracktotal=$(gettag tracktotal)
	if [ -n "$tracknum" -a -n "$tracktotal" ]
	then
		tracknum="$tracknum/$tracktotal"
	fi
	year=$(gettag date)
	infos="${infos//: /=}"
	rate=$(gettag rate|head -n1)
	channels=$(gettag channels|head -n1)
	bitrate=$(gettag 'nominal bitrate')
	bitrate=${bitrate%%,*}
}

getInfosFLAC_version='FLAC-1'
tagreaders+=( "$getInfosFLAC_version" )
getInfos::FLAC() {
	tagreader="$getInfosFLAC_version"
	infos=$(
		metaflac			\
			--show-tag=ALBUM	\
			--show-tag=ALBUMARTIST	\
			--show-tag=ARTIST	\
			--show-tag=COMPOSER	\
			--show-tag=DATE		\
			--show-tag=DISCNUMBER	\
			--show-tag=GENRE	\
			--show-tag=PERFORMER	\
			--show-tag=TITLE	\
			--show-tag=TRACKNUMBER	\
			--show-tag=TRACKTOTAL	\
			"$sourcepath/$filename"
	)
	albumartist=$(gettag albumartist)
	album=$(gettag album)
	artist=$(gettag artist)
	composer=$(gettag composer)
	disc=$(gettag discnumber)
	genre=$(gettag genre)
	performer=$(gettag performer)
	title=$(gettag title)
	tracknum="$(gettag tracknumber)/$(gettag tracktotal)"
	year=$(gettag date)
	if [ -n "$tracknum" -a -n "$tracktotal" ]
	then
		tracknum="$tracknum/$tracktotal"
	fi
	year=$(gettag DATE)
	{
		read rate
		read channels
	} < <(
		metaflac			\
			--show-sample-rate	\
			--show-channels		\
			"$sourcepath/$filename"
	)
}

getInfosAPE_version='APE-1'
tagreaders+=( "$getInfosAPE_version" )
getInfos::APE() {
	# I was not able to find a decent cli tool to read APE tags.
	# This is raw but works for the very few MusePack files I got.
	#
	# Please tell me if you know of any good tool.
	tagreader="$getInfosAPE_version"
	IFS='='
	while read tag value
	do
		IFS="$oldIFS"
		case $tag in
			[Aa][Ll][Bb][Uu][Mm]' '[Aa][Rr][Tt][Ii][Ss][Tt])
				albumartist="$value"
			;;
			[Aa][Rr][Tt][Ii][Ss][Tt])
				artist="$value"
			;;
			[Yy][Ee][Aa][Rr])
				year="$value"
			;;
			[Aa][Ll][Bb][Uu][Mm])
				album="$value"
			;;
			[Tt][Ii][Tt][Ll][Ee])
				title="$value"
			;;
			[Tt][Rr][Aa][Cc][Kk])
				tracknum="$value"
			;;
			[Gg][Ee][Nn][Rr][Ee])
				genre="$value"
			;;
			[Cc][Oo][Mm][Pp][Oo][Ss][Ee][Rr])
				composer="$value"
			;;
			[Pp][Ee][Rr][Ff][Oo][Rr][Mm][Ee][Rr])
				performer="$value"
			;;
			*)
			;;
		esac
		IFS='='
	done < <(
		IFS="$oldIFS"
		sed							\
		's/APETAGEX/\n/;s/[\x00\-\x1F]\x00\+/\n/g;s/\x00/=/g'	\
		"$sourcepath/$filename"					\
		| egrep -i 						\
		'^(Album Artist|Artist|Year|Album|Title|Track|Genre|Composer|Performer)='
	)
	IFS="$oldIFS"
}

tryAPE() {
	grep -q 'APETAGEX'	\
	"$sourcepath/$filename" \
	&& type=APE
}

getTags_version='unknown-1'
tagreaders+=( "$getTags_version" )
getTags() {
	unset type
	case "$mimetype" in
		audio/mpeg)
			type=MP3
		;;
		application/ogg)
			type=Ogg
		;;
		audio/x-flac)
			type=FLAC
		;;
		*)
			extendedtype=$(file -b "$sourcepath/$filename")
			case "$extendedtype" in
				*' ID3 '*)
					type=MP3
				;;
				*'Musepack '*)
					getRateChannelMPC
					tryAPE
				;;
				*)
					getRateChannelSoxi
					tryAPE
				;;
			esac
		;;
	esac
	if [ -n "$type" ]
	then
		getInfos::$type
	else
		tagreader=$getTags_version
	fi
}

checkCopy() {
	(
		[ -z "${destinationfrequency[$destination]}" ]		\
		|| (( ${rate:-0} == ${destinationfrequency[$destination]} ))
	) && (
		[ -z "${destinationchannels[$destination]}" ]		\
		|| (( ${channels:-0} == ${destinationchannels[$destination]} ))
	) && (
		(( ${bitrate:-1000} == ${destinationquality[$destination]} ))	\
		|| (
			[ -n "${destinationmaxbps[$destination]}" ]	\
			|| ((
				${bitrate:-1000}
				<= ${destinationmaxbps[$destination]:-0}
			))
		)
	)
}

decodeSox() {
	if (( ${destinationnormalize["$destination"]} ))
	then
		soxoptions_in+=" --norm"
	fi
	if [ -n "${destinationfrequency["$destination"]}" ]	\
	&& (( ${rate:-0} != ${destinationfrequency["$destination"]} ))
	then
		soxoptions_out+=" -r ${destinationfrequency["$destination"]}"
	fi
	if [ -n "${destinationchannels["$destination"]}" ]	\
	&& (( ${channels:-0} != ${destinationchannels["$destination"]} ))
	then
		soxoptions_out+=" -c ${destinationchannels["$destination"]}"
	fi
	tmpfile="$fileid${soxoptions_in// /}${soxoptions_out// /}"
	soxoptions_in+=' --single-threaded'
	soxoptions_out+=" --temp \"$tempdir\""
	if [ -n "$1" ]
	then
		origin="$1"
	else
		origin="$sourcepath/$filename"
	fi
	commandline="sox $soxoptions_in \"$origin\" $soxoptions_out \"$tempdir/$tmpfile.wav\""
}

decodeMpcdec() {
	tmpfile="${fileid}mpcdec"
	commandline="mpcdec \"$sourcepath/$filename\" \"$tempdir/$tmpfile.wav\""
}

decodeFile() {
	if ! decodetaskid=$(
		Select tasks id <<<"key = $tmpfile"
	)
	then
		decodetaskid=$(
			Insert tasks <<-EOInsert
				key		$tmpfile
				source_file	$fileid
				command_line	$commandline
				status		0
				cleanup		$tempdir/$tmpfile.wav
			EOInsert
		)
		progressSpin
	fi
	if (( sox_needed ))
	then
		decodeSox "$tempdir/$tmpfile.wav"
		if ! soxtaskid=$(
			Select tasks id <<<"key = $tmpfile"
		)
		then
			soxtaskid=$(
				Insert tasks <<-EOInsert
					key		$tmpfile
					source_file	$fileid
					command_line	$commandline
					requires	$decodetaskid
					status		0
					cleanup		$tempdir/$tmpfile.wav
				EOInsert
			)
			progressSpin
		fi
	fi
}

copyFile() {
	tmpfile="${fileid}copy$destination"
	extension="${filename##*.}"
	commandline="cp -al \"$sourcepath/$filename\" \"$destdir/$destfile.$extension\""
	commandline+=" 2>/dev/null"
	commandline+=' || '
	commandline+="cp -a \"$sourcepath/$filename\" \"$destdir/$destfile\""
	copytaskid=$(
		Insert tasks <<-EOInsert
			key		${fileid}copy$destination
			source_file	$fileid
			command_line	$commandline
			status		0
		EOInsert
	)
	progressSpin
}

getDestDir() {
	destdir="${destinationpath[$destination]}/"
	if [ -n "${destinationrenamepath[$destination]}" ]
	then
		destdir+="${destinationrenamepath[$destination]//%\{album\}/$album}"
		destdir="${destdir//%\{albumartist\}/$albumartist}"
		destdir="${destdir//%\{artist\}/$artist}"
		destdir="${destdir//%\{genre\}/$genre}"
		destdir="${destdir//%\{title\}/$title}"
		tracknumber="${track%/*}"
		destdir="${destdir//%\{track\}/$tracknumber}"
		destdir="${destdir//%\{year\}/$year}"
	else
		destdir+="${filename%/*}"
	fi
	if ! [ -d "$destdir" ]
	then
		mkdir -p "$destdir"
	fi
}

getDestFile() {
	if [ -n "${destinationrename[$destination]}" ]
	then
		destfile="${destinationrename[$destination]//%\{album\}/$album}"
		destfile="${destfile//%\{albumartist\}/$albumartist}"
		destfile="${destfile//%\{artist\}/$artist}"
		destfile="${destfile//%\{genre\}/$genre}"
		destfile="${destfile//%\{title\}/$title}"
		tracknumber="${track%/*}"
		destfile="${destfile//%\{track\}/$tracknumber}"
		destfile="${destfile//%\{year\}/$year}"
	else
		destfile="${filename##*/}"
		destfile="${destfile%.*}"
	fi
}

encodeFile::mp3() {
	lameopts="--quiet -v --abr ${destinationquality[$destination]}"
	[ -n "$album"	] && lameopts+=" --tl \"$album\""
	[ -n "$artist"	] && lameopts+=" --ta \"$artist\""
	[ -n "$genre"	] && lameopts+=" --tg \"$genre\""
	[ -n "$title"	] && lameopts+=" --tt \"$title\""
	[ -n "$track"	] && lameopts+=" --tn \"$track\""
	[ -n "$year"	] && lameopts+=" --ty \"$year\""
	encodetaskid=$(
		Insert tasks <<-EOInsert
			key		${fileid}lame$destination
			requires	${soxtaskid:-$decodetaskid}
			command_line	lame $lameopts "$tempdir/$tmpfile.wav" "$destdir/$destfile.mp3"
			source_file	$fileid
			status		0
		EOInsert
	)
	progressSpin
}

encodeFile::vorbis() {
	oggencopts="-Q -q ${destinationquality[$destination]}"
	[ -n "$albumartist" ] && oggencopts+=" -c \"ALBUMARTIST=$albumartist\""
        [ -n "$album"	] && oggencopts+=" -l \"$album\""
        [ -n "$artist"	] && oggencopts+=" -a \"$artist\""
	[ -n "$composer" ] && oggencopts+=" -c \"COMPOSER=$composer\""
	[ -n "$disc"	] && oggencopts+=" -c \"DISCNUMBER=$disc\""
        [ -n "$genre"	] && oggencopts+=" -G \"$genre\""
	[ -n "$performer" ] && oggencopts+=" -c \"PERFORMER=$performer\""
	[ -n "$title"	] && oggencopts+=" -t \"$title\""
        [ -n "$track"	] && oggencopts+=" -N \"$track\""
        [ -n "$year"	] && oggencopts+=" -d \"$year\""
	encodetaskid=$(
		Insert tasks <<-EOInsert
			key		${fileid}oggenc$destination
			requires	${soxtaskid:-$decodetaskid}
			command_line	oggenc $oggencopts -o "$destdir/$destfile.ogg" "$tempdir/$tmpfile.wav"
			source_file	$fileid
			status		0
		EOInsert
	)
	progressSpin
}

checkFinished() {
	#retrieve info from finished transcodeFile()
	#update counters / metadata
	:
}

checkLoad() {
	#if load > threshold
	#	decrease concurrency
	#elif load < threshold
	#	increase concurrency
	#fi
	:
}

readUserInput() {
	#read + / - / q(uit) / p(ause)
	#initiate shutdown / change load threshold / SIGSTOP all children / SIGCONT all children
	:
}

transcodeLauncher() {
	checkLoad
	checkFinished
	#until running processes < max processes
	#do
		checkLoad
		checkFinished
		readUserInput
	#done
	transcodeFile &
	#update counter / metadata
}

#UI

if [ ! -f ~/.atom/atom.cfg ]
then
	if [ ! -d ~/.atom ]
	then
		mkdir -p ~/.atom
	fi
	sed "s:%HOME%:$HOME:" "$exampleconf" > ~/.atom/atom.cfg
	cat >&2 <<-EOCfgNotice
	No configuration file found!
	An example file has been created as ~/.atom/atom.cfg.
	You should change it to your likings using you favorite editor.

	Bailing out.
	EOCfgNotice
	exit $ENOCFG
fi
getConfig

set -e
if (( debug ))
then
	cat <<-EOF
		General|Load|$maxload
		|Load Interval|$loadinterval
		|Temp Dir|$tempdir
		|Database|$database
		|Debug|$debug
		Source|Path|$sourcepath
	EOF
	for prune_expression in "${skippeddirectories[@]}"
	do
		echo "|Skipped directory|$prune_expression"
	done
	for destination in ${!destinationpath[@]}
	do
		cat <<-EOF
			$destination|Path|${destinationpath[$destination]}
			|Format|${destinationformat[$destination]}
			|Quality|${destinationquality[$destination]}
			|Normalize|${destinationnormalize[$destination]}
			|Channels|${destinationchannels[$destination]}
			|Frequency|${destinationfrequency[$destination]}
			|Path Change|${destinationrenamepath[$destination]}
			|File Rename|${destinationrename[$destination]}
		EOF
		echo "|Skipped mime-type|${destinationskipmime[$destination]//\|/
|Skipped mime-type|}"
	echo "|Copied mime-type|${destinationcopymime[$destination]//\|/
|Copied mime-type|}"
	done
fi |column -t -s'|' -n

openDatabase

createDestinations

getFiles

updateMimes

removeObsoleteFiles

# get files
for reader in "${tagreaders[@]}"
do
	tagreaderclause+="${tagreaderclause:+ AND }NOT tags.tagreader = \"$reader\""
done
echo '
	SELECT	COUNT(DISTINCT source_files.filename)
	FROM			source_files
		INNER JOIN	destination_files
			ON	destination_files.source_file_id=source_files.id
		INNER JOIN	destinations
			ON	destination_files.destination_id=destinations.id
		INNER JOIN	mime_type_actions
			ON	destinations.id=mime_type_actions.destination_id
		INNER JOIN	tags
			ON	source_files.id=tags.source_file
	WHERE	mime_type_actions.id = source_files.mime_type
	AND	(
				CAST(tags.last_change AS TEXT)
				<>
				CAST(source_files.last_change AS TEXT)
			OR	('"$tagreaderclause"')
		)
	AND	mime_type_actions.action = 1;' >&3
read -u4 filecount
echo '
	SELECT DISTINCT
		source_files.id,
		source_files.last_change,
		mime_type_actions.mime_text,
		source_files.filename
	FROM			source_files
		INNER JOIN	destination_files
			ON	destination_files.source_file_id=source_files.id
		INNER JOIN	destinations
			ON	destination_files.destination_id=destinations.id
		INNER JOIN	mime_type_actions
			ON	destinations.id=mime_type_actions.destination_id
		INNER JOIN	tags
			ON	source_files.id=tags.source_file
	WHERE	mime_type_actions.id = source_files.mime_type
	AND	(
				CAST(tags.last_change AS TEXT)
				<>
				CAST(source_files.last_change AS TEXT)
			OR	('"$tagreaderclause"')
		)
	AND	mime_type_actions.action = 1;

	SELECT "AtOM:NoMoreFiles";' >&3
read -u4 line
while ! [[ $line = AtOM:NoMoreFiles ]]
do
	tagfiles+=("$line")
	read -u4 line
done
echo 'BEGIN TRANSACTION;' >&3
for line in "${tagfiles[@]}"
do
	sourcefileid=${line%%|*}
	rest=${line#*|}
	lastchange=${rest%%|*}
	rest=${rest#*|}
	mimetype=${rest%%|*}
	filename=${rest#*|}
	echo -en "\rTags: $((++count*100/filecount))%"
	if (( count % 1000 == 0 ))
	then
		echo 'COMMIT;BEGIN TRANSACTION;' >&3
		(( debug ))					\
		&& echo -n "	$count files read, committing..."
	fi
	if getTags
	then
		Update tags				\
		album		"${album:-NULL}"	\
		albumartist	"${albumartist:-NULL}"	\
		artist		"${artist:-NULL}"	\
		composer	"${composer:-NULL}"	\
		disc		"${disc:-NULL}"		\
		genre		"${genre:-NULL}"	\
		performer	"${performer:-NULL}"	\
		title		"${title:-NULL}"	\
		track		"${tracknum:-NULL}"	\
		year		"${year:-NULL}"		\
		last_change	"$lastchange"		\
		rate		"${rate:-NULL}"		\
		channels	"${channels:-NULL}"	\
		bitrate		"${bitrate:-NULL}"	\
		tagreader	"$tagreader"		\
	>/dev/null <<<"source_file = $sourcefileid"
	unset	genre		\
		albumartist	\
		year		\
		album		\
		disc		\
		artist		\
		tracknum	\
		title		\
		composer	\
		performer	\
		rate		\
		bitrate		\
		channels
	fi
done
echo 'COMMIT;' >&3
echo -e "\rRead tags from ${count:-0} files."
unset count tagfiles

echo '
	CREATE TEMPORARY TABLE tasks(
		id		INTEGER PRIMARY KEY,
		key		TEXT	UNIQUE,
		source_file	INTEGER,
		command_line	TEXT,
		requires	INTEGER,
		status		INTEGER NOT NULL,
		cleanup		TEXT,
		FOREIGN KEY(requires) REFERENCES tasks(id)
			ON DELETE SET NULL
	);
	CREATE INDEX tasks_by_key ON tasks ( key );' >&3

echo '
	SELECT	COUNT(source_files.id)
	FROM			source_files
		INNER JOIN	destination_files
			ON	source_files.id
					= destination_files.source_file_id
		INNER JOIN	destinations
			ON	destination_files.destination_id=destinations.id
		INNER JOIN	mime_type_actions
			ON	mime_type_actions.id = source_files.mime_type
		INNER JOIN	tags
			ON	source_files.id = tags.source_file
	WHERE	CAST(destination_files.last_change AS TEXT)
			<> CAST(source_files.last_change AS TEXT)
	AND	mime_type_actions.destination_id = destinations.id
	AND	mime_type_actions.action = 1;' >&3
read -u4 filecount
echo '
	SELECT
		source_files.id,
		source_files.filename,
		mime_type_actions.mime_text,
		destinations.name,
		destination_files.id,
		tags.rate,
		tags.channels,
		tags.bitrate,
		tags.genre,
		tags.albumartist,
		tags.year,
		tags.album,
		tags.disc,
		tags.artist,
		tags.track,
		tags.title,
		tags.composer,
		tags.performer
	FROM			source_files
		INNER JOIN	destination_files
			ON	source_files.id
					= destination_files.source_file_id
		INNER JOIN	destinations
			ON	destination_files.destination_id=destinations.id
		INNER JOIN	mime_type_actions
			ON	mime_type_actions.id = source_files.mime_type
		INNER JOIN	tags
			ON	source_files.id = tags.source_file
	WHERE	CAST(destination_files.last_change AS TEXT)
			<> CAST(source_files.last_change AS TEXT)
	AND	mime_type_actions.destination_id = destinations.id
	AND	mime_type_actions.action = 1;

	SELECT "AtOM:NoMoreFiles";' >&3
read -u4 line
while ! [[ $line = AtOM:NoMoreFiles ]]
do
	decodefiles+=("$line|")
	read -u4 line
done
echo -n 'Creating tasks...  '

echo 'BEGIN TRANSACTION;' >&3
for line in "${decodefiles[@]}"
do
	fileid=${line%%|*}
	rest=${line#*|}
	filename=${rest%%|*}
	rest=${rest#*|}
	mimetype=${rest%%|*}
	rest=${rest#*|}
	destination=${rest%%|*}
	rest=${rest#*|}
	destfileid=${rest%%|*}
	rest=${rest#*|}
	rate=${rest%%|*}
	rest=${rest#*|}
	channels=${rest%%|*}
	rest=${rest#*|}
	bitrate=${rest%%|*}
	rest=${rest#*|}
	genre=${rest%%|*}
	rest=${rest#*|}
	albumartist=${rest%%|*}
	rest=${rest#*|}
	year=${rest%%|*}
	rest=${rest#*|}
	album=${rest%%|*}
	rest=${rest#*|}
	disc=${rest%%|*}
	rest=${rest#*|}
	artist=${rest%%|*}
	rest=${rest#*|}
	track=${rest%%|*}
	rest=${rest#*|}
	title=${rest%%|*}
	rest=${rest#*|}
	composer=${rest%%|*}
	rest=${rest#*|}
	performer=${rest%%|*}
	unset rest
	case "$mimetype" in
		'audio/mpeg')
			if [[ ${destinationformat[$destination]} = mp3 ]] \
			&& checkCopy
			then
				copied=1
			else
				decodeSox
			fi
		;;
		'application/ogg')
			if [[ ${destinationformat[$destination]} = vorbis ]] \
			&& checkCopy
			then
				copied=1
			else
				decodeSox
			fi
		;;
		'audio/x-flac')
			decodeSox
		;;
		*)
			extendedtype=$(file -b "$sourcepath/$filename")
			case "$extendedtype" in
				*'Musepack '*)
					decodeMpcdec
					if (( ${destinationnormalize["$destination"]}))\
					|| (
					[ -n "${destinationfrequency["$destination"]}" ]\
					&& (( ${rate:-0} != ${destinationfrequency["$destination"]}))\
					) || (
					[ -n "${destinationchannels["$destination"]}" ]\
					&& (( ${channels:-0} != ${destinationchannels["$destination"]} ))
					)
					then
						sox_needed=1
					fi
				;;
				*)
					decodeSox
				;;
			esac
		;;
	esac
	if ! (( copied ))
	then
		decodeFile
	fi
	getDestDir
	getDestFile
	if (( copied ))
	then
		copyFile
	else
		encodeFile::${destinationformat[$destination]}
	fi
	unset			\
		album		\
		albumartist	\
		artist		\
		bitrate		\
		channels	\
		commandline	\
		composer	\
		copied		\
		decodetaskid	\
		destfileid	\
		destination	\
		disc		\
		fileid		\
		filename	\
		mimetype	\
		performer	\
		rate		\
		rest		\
		sox_needed	\
		soxoptions_in	\
		soxoptions_out	\
		soxtaskid	\
		title		\
		track		\
		year		\
		tmpfile
done
echo 'COMMIT;' >&3
echo -e "\rCreated $count tasks for $filecount files"
unset count

closeDatabase

# vim:set ts=8 sw=8: