#!/bin/sh
# The Init Script for Node and NPM Install and Configurations
#
#

## CONSTANTS and Parameters
node_default_ver=v0.10.29
bash_profile=$HOME/.bash_profile
nvm_dir=$HOME/.nvm

## Functions

##
## Initialize the Bash profile
##
function initBashProfile {
	echo "Initialize the bash profile"
	
	if [ -f "$bash_profile" ]; then
  		echo ".bash_profile exists"
	else
  		touch $bash_profile
	fi

	source $bash_profile
}

##
## @param command	- The command for version check
## @param ver		- The required version
##
function validateVersion {
	command=$1
	ver=$2
	out=`$command`
	res=0
	
	check_ver=`echo "$out" | grep "$ver"`
	if [ -z "$check_ver" ]; then
		# InValid
		res=1
	fi
	echo "$res"
}

##
## Set the NPM Configurations
##
function configureNPM {

	if [ ! -z "$NPM_REGISTRY" ]; then
		echo "Set the npm config registry to $NPM_REGISTRY"
		npm config set registry $NPM_REGISTRY
	fi

	if [ ! -z "$NPM_CACHE" ]; then
		echo "Set the npm config cache to $NPM_CACHE"
		npm config set cache $NPM_CACHE
	fi

	if [ ! -z "$NPM_TMP" ]; then
		echo "Set the npm config tmp to $NPM_TMP"
		npm config set tmp $NPM_TMP
	fi


	if [ ! -z "$PYTHON_PATH" ]; then
		echo "Set the npm config python to $PYTHON_PATH"
		npm config set python $PYTHON_PATH
	fi
}

##
## Install the node and npm using NVM module
##
function installNode {
	echo "************************ Start install *************************"
	# Detect profile file if not specified as environment variable (eg: PROFILE=~/.myprofile).
	if [ -z "$PROFILE" ]; then
		initBashProfile
		export PROFILE=$bash_profile
	fi
	if [ -z "$NVM_DIR" ]; then
  		export NVM_DIR=$nvm_dir
	fi
	#source $PROFILE
	[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
	node_ver=$node_default_ver
	# Read the user requested version
	if [ ! -z "$NODE_VERSION" ]; then
		node_ver=$NODE_VERSION 
	fi
	
	# validate the existing version
	#
	echo "######"
	echo "# Checking for Required versions of node and npm." 
	echo "# If not intalled or not found on PATH, the script will install the required version."
	echo "# Please Ignore the node and npm command not found warnings."
	echo "######"

	if [[ $(validateVersion "node -v" "$node_ver") = 0 ]]; then
		echo "Installed node version: $node_ver"
	elif [[ $(validateVersion "nvm ls" "$node_ver") = 0 ]]; then
		echo "Installed node version: `nvm ls $node_ver`"
		nvm use $node_ver
		node_dir=$NVM_DIR/$node_ver
	else
		echo "node version to install: $node_ver"
		# Install Node using NVM - https://github.com/creationix/nvm
		curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | /bin/sh
		#source $PROFILE
		[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
		nvm install $node_ver
		nvm use $node_ver
		node_dir=$NVM_DIR/$node_ver
		node_exec_path=$node_dir/bin
		if [ -f "$node_exec_path/node" ]; then
			echo "Successfully Installed node and npm"
		else
			echo "Failed to install the node version $node_ver using NVM"
			#TODO what to do if the NVM Install fails? Exit the CI Build?
			#exit 1
		fi
	fi

	export NODE_EXEC_PATH=`which node`
	export NODE_VERSION=`node -v`
	export NPM_EXEC_PATH=`which npm`
	export NPM_VERSION=`npm -v`
	if [ -z "$node_dir" ]; then
		node_dir=`dirname $NODE_EXEC_PATH`
	fi
	export NODE_EXEC_DIR=$node_dir
	export PATH=$NODE_EXEC_DIR:$PATH

	echo "node exec path - $NODE_EXEC_PATH"
	echo "node version $NODE_VERSION"
	echo "npm exec path $NPM_EXEC_PATH"
	echo "npm version $NPM_VERSION"
	echo "node exec dir $NODE_EXEC_DIR"
	echo "PATH $PATH"

	configureNPM

	echo "************************ End Init *************************"
	#exit 0
}