#!/bin/bash

setupDestination() {
	cat <<-EODesc

        Format:
            vorbis, opus or mp3. Other formats may appear in the future.
	EODesc
	comeagain() {
		read						\
			-e					\
			${destinationformat["$destination"]+-i"${destinationformat["$destination"]}"}\
			-p 'Format: '				\
			value
		case "$value" in
			'mp3')
				destinationformat["$destination"]=mp3
				lameneeded=1
			;;
			'opus')
				destinationformat["$destination"]=opus
				opusencneeded=1
			;;
			'vorbis'|'ogg')
				destinationformat["$destination"]=vorbis
				oggencneeded=1
			;;
			*)
				echo "Unsupported destination format: $value" >&2
				comeagain
			;;
		esac
	}
	comeagain
	cat <<-EODesc

        Path (path):
            Where to store transcoded files (will be created if it does not
            exist).
	EODesc
	read							\
		-e						\
		-p'Path: '					\
		${destinationpath["$destination"]+-i"${destinationpath["$destination"]}"}\
		destinationpath["$destination"]
	case ${destinationformat["$destination"]} in
		vorbis)
			cat <<-EODesc

        Quality (integer):
            The quality parameter of oggenc. See man oggenc for more info.
			EODesc
			expr='^[0-9]*$'
			comeagain() {
				read 					\
					-p'Quality: '			\
					-e				\
					-i				\
					${destinationquality["$destination"]:-3}\
					value
				if ! [[ $value =~ $expr ]]
				then
					echo "Invalid quality value: $value" >&2
					comeagain
				fi
			}
			comeagain
			destinationquality["$destination"]=$value
		;;
		opus)
			cat <<-EODesc

        Bitrate (kbps, integer):
            Set (VBR) bitrate to <bitrate>. Note that while Opus allows for
            decimal values, AtOM does not. The reason for this is simple: we do
            numeric comparisons, and Bash only manipulates integers.
			EODesc
			expr='^[0-9]*$'
			comeagain() {
				read					\
					-e				\
					-i				\
					${destinationquality["$destination"]:-128}\
					-p 'Bitrate: '
					value
				if ! [[ $value =~ $expr ]]
				then
					echo "Invalid bitrate value: $value" >&2
					comeagain
				fi
			}
			comeagain
			destinationquality["$destination"]=$value
			cat <<-EODesc

        Loss (percent, integer):
            If you intend to stream the resulting files over an unreliable
            protocol, you may want to make use of Opus' Forward Error
            Correction algorythm. See the Opus-codec.org website for details.
			EODesc
			comeagain() {
				read					\
					-e				\
					-i				\
					${destinationloss["$destination"]:-0}\
					value
				if ! [[ $value =~ $expr ]]
				then
					echo "Invalid loss value: $value" >&2
					comeagain
				fi
			}
			comeagain
			destinationloss["$destination"]=$value
		;;
		mp3)
			cat <<-EODesc

        Bitrate (kbps, integer):
            Set (ABR) bitrate to <bitrate>.
			EODesc
			expr='^[0-9]*$'
			comeagain() {
				read					\
					-e				\
					-i				\
					${destinationquality["$destination"]:-128}\
					value
				if ! [[ $value =~ $expr ]]
				then
					echo "Invalid bitrate value: $value" >&2
					comeagain
				fi
			}
			comeagain
			destinationquality["$destination"]=$value
			cat <<-EODesc

        Prevent resampling (boolean):
            LAME may decide to encode your file to a lower sampling-rate if you
            use a low bitrate. Setting this to yes will append --resample
            <original file's rate>, preventing any resampling from happening.
			EODesc
			case ${destinationnoresample["$destination"]} in
				0)	initialvalue=n		;;
				1)	initialvalue=y		;;
				*)	unset initialvalue	;;
			esac
			comeagain() {
				read					\
					-e				\
					${initialvalue+-i $initialvalue}\
					-p'Prevent resampling (y/N): '	\
					value
				case $value in
					[yY])
						destinationnoresample["$destination"]=1
					;;
					''|[nN])
						destinationnoresample["$destination"]=0
					;;
					*)
						comeagain
					;;
				esac
			}
			comeagain
		;;
	esac
	cat <<-EODesc

        [Optional parameters]
            Now you will have the opportunity to configure "advanced" parameters
            for $destination. You may leave any of these fields blank.
	EODesc
	cat <<-EODesc

        Normalize (boolean):
            Normalize output files.
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
	cat <<-EODesc
	EODesc
	comeagain() {
		:
	}
	comeagain
}