#!/usr/bin/env bash

# NOTE: `huggingface-cli download` already exists to do this

# fills huggingfaces cache by downloading safetensors files in parallel
# usage: $ bash download_weights.bash SOME/MODEL_ID COMMIT_HASH -j4

#PV="pv -cpteabm $((60*60*24))"
PV="pv -cpteab"

model_id="$1"
revision="$2"
shift 2
repo_url=https://huggingface.co/"$model_id"
clonepath="$(basename "$repo_url")"
cachepath="${HOME}/.cache/huggingface/hub/models--${model_id//\//--}/blobs"
if ! [ -e ${HOME}/.cache/huggingface/token ]
then
	huggingface-cli login || exit -1
fi
HF_TOKEN="$(<${HOME}/.cache/huggingface/token)"
GIT_LFS_SKIP_SMUDGE=1 git clone https://huggingface.co/"$model_id" "$clonepath"
mkdir -p "$cachepath"
cd "$clonepath"
GIT_LFS_SKIP_SMUDGE=1 git checkout "$revision" || exit -1
filecount=$(ls *.safetensors | wc -l)
export repo_url revision cachepath HF_TOKEN PV
# troubleshot by adding -vx before -c in the bash command
parallel "$@" -i bash -c \
	'file_url="$repo_url"/resolve/"$revision"/"{}";\
        export $(cat "{}" | tr \  =);\
       	blobname=${oid##*:};\
	outfile="$cachepath"/"$blobname";\
	set pipefail;\
	if [ "$(($(stat -c %s "$outfile" 2>/dev/null)))" != "$(($size))" ]; then\
       		curl --silent -L --header "Authorization: Bearer $HF_TOKEN" "$file_url" |\
       			$PV -s "$size" -N "{}" > "$outfile" 2>/dev/tty || continue;\
	fi;\
	echo "$blobname" "$outfile"'\
       	-- *.safetensors |
		$PV -l -s "$filecount" -N "$clonepath" 2>/dev/tty |
		sha256sum -c && echo SUCCESS || { echo ERROR try again; false; }