#!/bin/sh
# Helper script used to check and update engine dependencies
# This should not be called manually

command -v curl >/dev/null 2>&1 || command -v wget > /dev/null 2>&1 || { echo >&2 "The OpenRA mod template requires curl or wget."; exit 1; }
command -v python >/dev/null 2>&1 || { echo >&2 "The OpenRA mod template requires python."; exit 1; }

require_variables() {
	missing=""
	for i in "$@"; do
		eval check="\$$i"
		[ -z "${check}" ] && missing="${missing}   ${i}\n"
	done
	if [ ! -z "${missing}" ]; then
		echo "Required mod.config variables are missing:\n${missing}Repair your mod.config (or user.config) and try again."
		exit 1
	fi
}

TEMPLATE_LAUNCHER=$(python -c "import os; print(os.path.realpath('$0'))")
TEMPLATE_ROOT=$(dirname "${TEMPLATE_LAUNCHER}")

# shellcheck source=mod.config
. "${TEMPLATE_ROOT}/mod.config"

if [ -f "${TEMPLATE_ROOT}/user.config" ]; then
	# shellcheck source=user.config
	. "${TEMPLATE_ROOT}/user.config"
fi

require_variables "MOD_ID" "ENGINE_VERSION" "ENGINE_DIRECTORY"

CURRENT_ENGINE_VERSION=$(cat "${ENGINE_DIRECTORY}/VERSION" 2> /dev/null)

if [ -f "${ENGINE_DIRECTORY}/VERSION" ] && [ "${CURRENT_ENGINE_VERSION}" = "${ENGINE_VERSION}" ]; then
	exit 0
fi

if [ "${AUTOMATIC_ENGINE_MANAGEMENT}" = "True" ]; then
	require_variables "AUTOMATIC_ENGINE_SOURCE" "AUTOMATIC_ENGINE_EXTRACT_DIRECTORY" "AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME"

	echo "OpenRA engine version ${ENGINE_VERSION} is required."

	if [ -d "${ENGINE_DIRECTORY}" ]; then
		if [ "${CURRENT_ENGINE_VERSION}" != "" ]; then
			echo "Deleting engine version ${CURRENT_ENGINE_VERSION}."
		else
			echo "Deleting existing engine (unknown version)."
		fi

		rm -rf "${ENGINE_DIRECTORY}"
	fi

	echo "Downloading engine..."
	if command -v curl > /dev/null 2>&1; then
		curl -s -L -o "${AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME}" -O "${AUTOMATIC_ENGINE_SOURCE}" || exit 3
	else
		wget -cq "${AUTOMATIC_ENGINE_SOURCE}" -O "${AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME}" || exit 3
	fi

	# Github zipballs package code with a top level directory named based on the refspec
	# Extract to a temporary directory and then move the subdir to our target location
	REFNAME=$(unzip -qql "${AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME}" | head -n1 | tr -s ' ' | cut -d' ' -f5-)

	rm -rf "${AUTOMATIC_ENGINE_EXTRACT_DIRECTORY}"
	mkdir "${AUTOMATIC_ENGINE_EXTRACT_DIRECTORY}"
	unzip -qq -d "${AUTOMATIC_ENGINE_EXTRACT_DIRECTORY}" "${AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME}"
	mv "${AUTOMATIC_ENGINE_EXTRACT_DIRECTORY}/${REFNAME}" "${ENGINE_DIRECTORY}"
	rmdir "${AUTOMATIC_ENGINE_EXTRACT_DIRECTORY}"
	rm "${AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME}"

	echo "Compiling engine..."
	cd "${ENGINE_DIRECTORY}" || exit 1
	make version VERSION="${ENGINE_VERSION}"
	exit 0
fi

echo "Automatic engine management is disabled."
echo "Please manually update the engine to version ${ENGINE_VERSION}."
exit 1