#!/usr/bin/env bash

# this script generates compressed blobs for a model into huggingface's cache, to be transferred elsewhere and decompressed
# the size is reduced by about 22%

LEVEL=-4
#LEVEL=-9
#LEVEL=--adapt=min=1,max=22
PV="pv -cpteabm $((60*60*24))"
#PV="pv -cpteab"

model_id="$1"
revision="$2"
repo_url=https://huggingface.co/"$model_id"
clonepath="$(basename "$repo_url")"
cachepath="${HOME}/.cache/huggingface/hub/models--${model_id//\//--}/blobs"
if ! [ -e ${HOME}/.cache/huggingface/token ]
then
	huggingface-cli login || exit -1
fi
HF_TOKEN="$(<${HOME}/.cache/huggingface/token)"
GIT_LFS_SKIP_SMUDGE=1 git clone https://huggingface.co/"$1" "$clonepath"
mkdir -p "$cachepath"
cd "$clonepath"
git checkout "$revision" || exit -1
filecount=$(ls *.safetensors | wc -l)
for file in *.safetensors
do
	file_url="$repo_url"/resolve/"$revision"/"$file"
	export $(cat "$file" | tr \  =) # sets oid and size
	blobname=${oid##*:}
	outfile="$cachepath"/"$blobname".zst
	if [ -e "$outfile" ]; then
		zstd -l "$outfile" && { echo "$file" 1>&3; continue; }
		echo
		echo "# Recompressing $file #"
	fi
	echo
	{ curl -s -L -H "Authorization: Bearer $HF_TOKEN" "$file_url" || exit -1; } | $PV -s "$size" -N "$file" | zstd -q --no-progress --force --size-hint="$size" --stream-size="$size" --ultra --long=31 --memory=2048MB --threads=1024 "$LEVEL" | $PV -s "$((size * 100/129))" -N "$blobname".zst > "$outfile"
	zstd -l "$outfile"
	echo
	echo
	echo "$file" 1>&3
done 3>&1 1>&2 | $PV -l -s "$filecount" -N "$clonepath"