#!/usr/bin/env bash

set -euo pipefail

BUILD_OUTPUT="out"

while [[ $# -gt 0 ]]; do
	case $1 in
		--hydra-url)
			HYDRA_URL="$2"
			shift
			shift
			;;
		--hydra-project)
			HYDRA_PROJECT="$2"
			shift
			shift
			;;
		--hydra-jobset)
			HYDRA_JOBSET="$2"
			shift
			shift
			;;
		--hydra-job)
			HYDRA_JOB="$2"
			shift
			shift
			;;
		--nix-store-uri)
			NIX_STORE_URI="$2"
			shift
			shift
			;;
		--build-output)
			BUILD_OUTPUT="$2"
			shift
			shift
			;;
		--gcroot-name)
			GCROOT_NAME="$2"
			shift
			shift
			;;
		-*)
			echo "Unknown option $1"
			exit 1
			;;
		*)
			ARGS+=("$1")
			shift
			;;
	esac
done

set -- "${ARGS[@]}"

HYDRA_JOB_URL="${HYDRA_URL}/job/${HYDRA_PROJECT}/${HYDRA_JOBSET}/${HYDRA_JOB}/latest-finished"
RESULT_PATH="$1"

echo "Updating ${RESULT_PATH} from ${HYDRA_PROJECT}:${HYDRA_JOBSET}:${HYDRA_JOB} output ${BUILD_OUTPUT}"

echo "Make sure symlink directory exist"
mkdir -p "$(dirname "${RESULT_PATH}")"

echo "Fetching job output"
STORE_PATH="$(curl -s -L -H "Accept: application/json" "${HYDRA_JOB_URL}" | jq -r ".buildoutputs.${BUILD_OUTPUT}.path")"

echo "Copying path"
nix copy --from "${NIX_STORE_URI}" "${STORE_PATH}"

echo "Activate path"
ln -fsn "${STORE_PATH}" "${RESULT_PATH}"

if [[ -n $GCROOT_NAME ]]; then
	GCROOT_PATH="/nix/var/nix/gcroots/update-from-hydra/${GCROOT_NAME}"
	echo "Add to gcroot ${GCROOT_PATH}"
	mkdir -p "$(dirname "${GCROOT_PATH}")"

	ln -fsn "${RESULT_PATH}" "${GCROOT_PATH}"
fi