#!/bin/sh

set -eu

XP_CHANNEL=${XP_CHANNEL:-stable}
XP_VERSION=${XP_VERSION:-current}

os=$(uname -s)
arch=$(uname -m)
OS=${OS:-"${os}"}
ARCH=${ARCH:-"${arch}"}
OS_ARCH=""
COMPRESSED=${COMPRESSED:-"False"}

BIN=${BIN:-crank}

unsupported_arch() {
	os="$1"
	arch="$2"
	echo "Crossplane does not support $os / $arch at this time."
	exit 1
}

case $OS in
CYGWIN* | MINGW64* | Windows*)
	if [ "$ARCH" = "x86_64" ]; then
		OS_ARCH=windows_amd64
		BIN=crank.exe
	else
		unsupported_arch "$OS" "$ARCH"
	fi
	;;
Darwin)
	case $ARCH in
	x86_64 | amd64)
		OS_ARCH=darwin_amd64
		;;
	arm64)
		OS_ARCH=darwin_arm64
		;;
	*)
		unsupported_arch "$OS" "$ARCH"
		;;
	esac
	;;
Linux)
	case $ARCH in
	x86_64 | amd64)
		OS_ARCH=linux_amd64
		;;
	arm64 | aarch64)
		OS_ARCH=linux_arm64
		;;
	*)
		unsupported_arch "$OS" "$ARCH"
		;;
	esac
	;;
*)
	unsupported_arch "$OS" "$ARCH"
	;;
esac

_compr=$(echo "$COMPRESSED" | tr '[:upper:]' '[:lower:]')

if [ "${_compr}" = "true" ]; then
	url_dir="bundle"
	url_file="crank.tar.gz"
	url_error="a compressed file for "
else
	url_dir="bin"
	url_file="${BIN}"
	url_error=""
fi

url="https://releases.crossplane.io/${XP_CHANNEL}/${XP_VERSION}/${url_dir}/${OS_ARCH}/${url_file}"

if ! curl -sfL "${url}" -o "${url_file}"; then
	echo "Failed to download Crossplane CLI. Please make sure ${url_error}version ${XP_VERSION} exists on channel ${XP_CHANNEL}."
	exit 1
fi

if [ "${_compr}" = "true" ]; then
	if ! tar xzf "${url_file}"; then
		echo "Failed to unpack the Crossplane CLI compressed file."
		exit 1
	fi
	if ! mv "${BIN}" crossplane; then
		echo "Failed to rename the unpacked Crossplane CLI binary: \"${BIN}\". Make sure it exists inside the compressed file."
		exit 1
	fi
	rm "${BIN}.sha256" "${url_file}"
else
	mv "${url_file}" crossplane
fi

chmod +x crossplane

echo "crossplane CLI downloaded successfully! Run the following commands to finish installing it:"
echo
echo sudo mv crossplane /usr/local/bin
echo crossplane --help
echo
echo "Visit https://crossplane.io to get started. 🚀"
printf "Have a nice day! 👋\n"