#!/usr/bin/env bash
set -eo pipefail

if [[ -z "$AZURE_STORAGE_CONNECTION_STRING" ]]; then
	echo "AZURE_STORAGE_CONNECTION_STRING is required"
	exit 1
fi

if [[ -z "$CONTAINER_NAME" ]]; then
	echo "CONTAINER_NAME is required"
	exit 1
fi

if [[ -z "$BLOB_NAME" ]]; then
		echo "BLOB_NAME is required"
		exit 1
fi

if [[ "$SUDO" = true ]]; then
	SUDO_COMMAND=(sudo)
else
	SUDO_COMMAND=()
fi

CACHE_PATH=${CACHE_PATH:-$BLOB_NAME}


echo "--> Checking whether blob exists"
EXISTS=$(
	az storage blob exists \
	--container-name "$CONTAINER_NAME" \
	--name "$BLOB_NAME" \
	--connection-string "$AZURE_STORAGE_CONNECTION_STRING" \
	--output tsv
)
echo "$EXISTS"

if [[ "$EXISTS" = True ]]; then
	echo "--> Downloading and extracting blob"
	mkdir -p "$CACHE_PATH"
	az storage blob download \
		--container-name "$CONTAINER_NAME" \
		--name "$BLOB_NAME" \
		--no-progress \
		| "${SUDO_COMMAND[@]}" env ZSTD_NBTHREADS=0 tar -C "$CACHE_PATH" -x --zstd -f -
	echo "Extracted"

	echo "cache-hit=true" >> "$GITHUB_OUTPUT"
else
	echo "cache-hit=false" >> "$GITHUB_OUTPUT"
fi