#!/usr/bin/env bash

DENO_VERSION="${VERSION:-"latest"}"

set -e

if [ "$(id -u)" -ne 0 ]; then
	echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
	exit 1
fi

# Clean up
rm -rf /var/lib/apt/lists/*

if [ "$OS" = "Windows_NT" ]; then
	target="x86_64-pc-windows-msvc"
else
	case $(uname -sm) in
	"Darwin x86_64") target="x86_64-apple-darwin" ;;
	"Darwin arm64") target="aarch64-apple-darwin" ;;
	"Linux aarch64")
		echo "Error: Official Deno builds for Linux aarch64 are not available. (https://github.com/denoland/deno/issues/1846)" 1>&2
		exit 1
		;;
	*) target="x86_64-unknown-linux-gnu" ;;
	esac
fi

# Checks if packages are installed and installs them if not
check_packages() {
	if ! dpkg -s "$@" >/dev/null 2>&1; then
		if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
			echo "Running apt-get update..."
			apt-get update -y
		fi
		apt-get -y install --no-install-recommends "$@"
	fi
}

# make sure we have curl
check_packages ca-certificates curl

if [ "${DENO_VERSION}" == "latest" ]; then
	deno_uri="https://github.com/denoland/deno/releases/latest/download/deno-${target}.zip"
else
	deno_uri="https://github.com/denoland/deno/releases/download/v${DENO_VERSION}/deno-${target}.zip"
fi

deno_install="/usr/local/lib/deno"
bin_dir="$deno_install/bin"
exe="$bin_dir/deno"

if [ ! -d "$bin_dir" ]; then
	mkdir -p "$bin_dir"
fi

curl --fail --location --progress-bar --output "$exe.zip" "$deno_uri"
unzip -d "$bin_dir" -o "$exe.zip"
chmod +x "$exe"
rm "$exe.zip"

ln -s $exe /usr/local/bin/deno

# Clean up
rm -rf /var/lib/apt/lists/*

echo "Done!"