#!/bin/bash

set -e

cd "$(dirname $0)/.."

# Test whether we need update.
if [ -f "node/node" ]; then
  exit 0
fi

if ! DOWNLOAD_PAGE=$(curl -fsSkL http://nodejs.org/download/); then
  exit 1;
fi

NODE_VERSION=$(echo "$DOWNLOAD_PAGE" \
               | awk '/Current version:/ { print }' \
               | awk -F"[<>]" '{ print $5 }')

case $OSTYPE in
  darwin*) NODE_PLATFORM=darwin ;;
  linux*) NODE_PLATFORM=linux ;;
  *) echo "Unsupported platform $OSTYPE" && exit 1 ;;
esac

if uname -a | grep 'x86_64' > /dev/null ; then
  NODE_ARCH=x64
else
  NODE_ARCH=x86
fi

NODE_DIST_NAME="node-$NODE_VERSION-$NODE_PLATFORM-$NODE_ARCH"

# Download node and untar
NODE_TARBALL_URL="http://nodejs.org/dist/$NODE_VERSION/$NODE_DIST_NAME.tar.gz"
TARGET_DIR='node'
[ -d "$TARGET_DIR" ] || mkdir "$TARGET_DIR"
cd "$TARGET_DIR"
curl -fsSkL $NODE_TARBALL_URL | tar -zx || exit 1

cp "$NODE_DIST_NAME/bin/node" .
rm -rf "$NODE_DIST_NAME"