#!/bin/sh
GITDIR=$(git rev-parse --show-toplevel)

# TODO : MIGHT need a failsafe to skip extremely large files, maybe less than 100mb is fine
# TODO : MIGHT also implement a filename "uncompressed-*" to end up without any compression
# TODO : MIGHT need to implement replacement of files with spaces to dashes
# TODO : MIGHT need to implement same file realiser, two filenames with the same will lead to some errors
# TODO : MIGHT be able to export with functions and eval parameters to reduce this weird repitition (PRIORITY)

# Installing webp images with assets/images
WEBP_IMAGES=$(git diff --name-only --cached | grep -E "\.(webp|WEBP)$")
NON_WEBP_IMAGES=$(git diff --name-only --cached | grep -E "\.(jpg|png|JPG|PNG)$")
IMG_LIMIT=150

for filename in $WEBP_IMAGES; do
    QUALITY=80
    SIZE=100
    UNSUFFIXED_FILENAME=${filename%.*}

    git restore --staged "$GITDIR/$filename"

    # One conversion atleast
    convert $GITDIR/$filename \
	    -resize $SIZE% \
	    -quality $QUALITY \
	    -format "webp" \
	    $GITDIR/$UNSUFFIXED_FILENAME.webp;
    
    while [ -e "$GITDIR/$UNSUFFIXED_FILENAME.webp" ] && \
	  [ $(du -a "$GITDIR/$UNSUFFIXED_FILENAME.webp" | \
		       awk -F' ' '{print $1}') -ge $IMG_LIMIT ] && \
	  [ $(($SIZE > 0)) ]; do
	
	SIZE=$(($SIZE - 20))

	convert $GITDIR/$UNSUFFIXED_FILENAME.webp \
		-resize $SIZE% \
		-quality $QUALITY \
		-format "webp" \
		$GITDIR/$UNSUFFIXED_FILENAME.webp;
    done;
done;

    

for filename in $NON_WEBP_IMAGES; do
    QUALITY=80
    SIZE=100
    UNSUFFIXED_FILENAME=${filename%.*}

    git restore --staged "$GITDIR/$filename"

    if [ -e "$GITDIR/$UNSUFFIXED_FILENAME.webp" ]
    then
	rm "$GITDIR/$filename"
	echo "SKIPPING $filename : the filename already exists"
	continue
    fi

    # One conversion atleast
    convert $GITDIR/$filename \
	    -resize $SIZE% \
	    -quality $QUALITY \
	    -format "webp" \
	    $GITDIR/$UNSUFFIXED_FILENAME.webp;

    rm "$GITDIR/$filename"
        
    while [ -e "$GITDIR/$UNSUFFIXED_FILENAME.webp" ] && \
	  [ $(du -a "$GITDIR/$UNSUFFIXED_FILENAME.webp" | \
		       awk -F' ' '{print $1}') -ge $IMG_LIMIT ] && \
	  [ $(($SIZE > 20)) ]; do
	
	SIZE=$(($SIZE - 20))

	convert $GITDIR/$UNSUFFIXED_FILENAME.webp \
		-resize $SIZE% \
		-quality $QUALITY \
		-format "webp" \
		$GITDIR/$UNSUFFIXED_FILENAME.webp;
    done;
done;

# Installing opus audio with assets/audio
NON_OPUS_AUDIOS=$(git diff --name-only --cached | grep -E "\.(mp3|wav|flac|m4a|ogg|wma)")
OPUS_AUDIOS=$(git diff --name-only --cached | grep -E "\.opus")
AUDIO_LIMIT=64


for filename in $OPUS_AUDIOS ; do
    COMPRESSION_LEVEL=10
    UNSUFFIXED_FILENAME=${filename%.*}
    BITRATE=128

    git restore --staged "$GITDIR/$filename"

    # One conversion atleast
    # This will do opus to opus with decoder
    # Degrading once quality but we tank it
    ffmpeg -hide_banner -y -loglevel warning \
	   -i "$GITDIR/$filename" \
	   -codec:a libopus \
	   -compression_level $COMPRESSION_LEVEL \
	   -vbr on \
	   "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus";

    mv "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus" "$GITDIR/$UNSUFFIXED_FILENAME.opus"

    while [ -e "$GITDIR/$UNSUFFIXED_FILENAME.opus" ] && \
	  [ $(du -a "$GITDIR/$UNSUFFIXED_FILENAME.opus" | \
		       awk -F' ' '{print $1}') -ge $AUDIO_LIMIT ] && \
	  [ $COMPRESSION_LEVEL -ge 3 ]; do
	
	COMPRESSION_LEVEL=$(($COMPRESSION_LEVEL - 3))
	BITRATE=$(($BITRATE / 2))
	
	ffmpeg -hide_banner -y -loglevel warning \
	       -y -i "$GITDIR/$UNSUFFIXED_FILENAME.opus" \
	       -codec:a libopus \
	       -compression_level $COMPRESSION_LEVEL \
	       -vbr constrained \
	       -b:a "${BITRATE}k" \
	       "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus";
	
	mv "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus" "$GITDIR/$UNSUFFIXED_FILENAME.opus";
    done;
done;


for filename in $NON_OPUS_AUDIOS ; do
    COMPRESSION_LEVEL=10
    UNSUFFIXED_FILENAME=${filename%.*}
    BITRATE=128

    git restore --staged "$GITDIR/$filename"

    if [ -e "$GITDIR/$UNSUFFIXED_FILENAME.opus" ]
    then
	rm "$GITDIR/$filename"
	echo "SKIPPING $filename : the filename already exists"
	continue
    fi
	
    # One conversion atleast
    # This will do opus to opus with decoder
    # Degrading once quality but we tank it
    ffmpeg -hide_banner -y -loglevel warning \
	   -i "$GITDIR/$filename" \
	   -codec:a libopus \
	   -compression_level $COMPRESSION_LEVEL \
	   -vbr on \
	   "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus";

    mv "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus" "$GITDIR/$UNSUFFIXED_FILENAME.opus"
    rm "$GITDIR/$filename"

    while [ -e "$GITDIR/$UNSUFFIXED_FILENAME.opus" ] && \
	  [ $(du -a "$GITDIR/$UNSUFFIXED_FILENAME.opus" | \
		       awk -F' ' '{print $1}') -ge $AUDIO_LIMIT ] && \
	  [ $COMPRESSION_LEVEL -ge 3 ]; do
	
	COMPRESSION_LEVEL=$(($COMPRESSION_LEVEL - 3))
	BITRATE=$(($BITRATE / 2))
	
	ffmpeg -hide_banner -y -loglevel warning \
	       -y -i "$GITDIR/$UNSUFFIXED_FILENAME.opus" \
	       -codec:a libopus \
	       -compression_level $COMPRESSION_LEVEL \
	       -vbr constrained \
	       -b:a "${BITRATE}k" \
	       "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus";
	
	mv "$GITDIR/$UNSUFFIXED_FILENAME-temp.opus" "$GITDIR/$UNSUFFIXED_FILENAME.opus";
    done;
done;

git add $GITDIR