#!/bin/sh
# Copyright (c) 2018 Yahweasel
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# This software uses code from FFmpeg <http://ffmpeg.org>, licensed under the GNU
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# <https://ffmpeg.org/download.html>.
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# FFmpeg copyright (c) Fabrice Bellard et al
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cd "$(dirname "$0")"

yesno() {
    case "$1" in
        y*|Y*)
            printf 'y'
            ;;

        n*|N*)
            printf 'n'
            ;;

        *)
            printf '%s' "$2"
            ;;
    esac
}

ffm() {
    if [ -e ffmpeg ]
    then
        ./ffmpeg "$@"
        return "$?"
    else
        ffmpeg "$@"
        return "$?"
    fi
}

printf 'This is the Craig audio processor. License information is in this script file.\n\n'

printf 'Please choose an output format:\n [F]LAC\n [A]udacity project\n [w]av\n [M]PEG-4 AAC (M4A)\n A[L]AC\n'
read -p '? ' FORMAT
ODIR=""
case "$FORMAT" in
    a*|A*)
        FORMAT="aup"
        FFORMAT="flac"
        CODEC="flac"
        ODIR="craig_data/"
        EXT="ogg"
        ;;

    w*|W*)
        FFORMAT="wav"
        CODEC="pcm_s16le"
        EXT="wav"
        ;;

    m*|M*)
        FFORMAT="ipod"
        CODEC="aac"
        EXT="m4a"
        ;;

    l*|L*)
        FFORMAT="ipod"
        CODEC="alac"
        EXT="m4a"
        ;;

    *)
        FORMAT="flac"
        FFORMAT="flac"
        CODEC="flac"
        EXT="flac"
        ;;
esac
DEXT=".$EXT"
if [ "$FORMAT" = "flac" ]
then
    DEXT="o.flac"
fi

read -p '
Mix into a single track? ' MIX
MIX=`yesno "$MIX" n`

read -p '
Level audio? ' LEVEL
LEVEL=`yesno "$LEVEL" n`

read -p '
Keep intermediate files? ' KEEP
KEEP=`yesno "$KEEP" n`

MULTI=""
FILTER=""
if [ "$LEVEL" = y ]
then
    LF="dynaudnorm"
else
    LF="anull"
fi

if [ "$FORMAT" = "aup" ]
then
    mkdir -p craig_data
fi

# Handle each file
c=0
for i in *[0-9].flac
do
    if [ "$MIX" = "y" ]
    then
        MULTI="$MULTI -i $i"
        FILTER="$FILTER"'['"$c"':a]'"$LF"'[aud'"$c"'];'

    else
        ffm -i "$i" -af "$LF" -c:a "$CODEC" -f "$FFORMAT" "$ODIR${i%.flac}$DEXT" || exit 1

    fi
    c=$((c+1))
done

# Maybe mix
if [ "$MIX" = "y" ]
then
    c=0
    for i in *[0-9].flac
    do
        FILTER="$FILTER"'[aud'"$c"']'
        c=$((c+1))
    done
    FILTER="$FILTER"'amix='"$c"','"$LF"'[aud]'

    ffm $MULTI -filter_complex "$FILTER" -map '[aud]' -c:a "$CODEC" -f "$FFORMAT" "${ODIR}craig.$EXT" || exit 1
fi

# If we were making an audacity project, finish it up
if [ "$FORMAT" = "aup" ]
then
    (
        printf '<?xml version="1.0" standalone="no" ?>
<!DOCTYPE project PUBLIC "-//audacityproject-1.3.0//DTD//EN" "http://audacity.sourceforge.net/xml/audacityproject-1.3.0.dtd" >
<project xmlns="http://audacity.sourceforge.net/xml/" projname="Craig" version="1.3.0" audacityversion="2.2.2" rate="48000.0">
	<tags/>\n'
        for i in *[0-9].flac
        do
            printf '\t<import filename="%s" offset="0.00000000" mute="0" solo="0" height="150" minimized="0" gain="1.0" pan="0.0"/>n' "${i%.flac}.ogg"
        done
        printf '</project>\n'
    ) > craig.aup
fi

# Clean up
if [ "$KEEP" = "n" ]
then
    for i in *[0-9].flac
    do
        rm "$i"
    done
    rm -f RunMe.sh RunMe.command ffmpeg
fi

printf 'Done!\n'
