#!/bin/bash
# This script installs Python3 and Java 8

# Set PATH to something useful
PATH="/usr/local/sbin:/usr/local/bin:/usr/gnu/bin:/sbin:/bin:/usr/sbin:/usr/bin"

# Install required tool via RPM
function InstallTool() {
	tool=${1}
	package=${2}
	
	installed=`which "$tool" 2>/dev/null`
	if [ "$installed" = "" ]; then
		echo "Installing $tool"
		if [ "$user" = "root" ]; then
			yum –y install "$package"
			stat=$?
		else
			sudo yum –y install "$package"
			stat=$?
		fi
		
		if [ $stat -gt 0 ]; then
			echo "Installing '$tool' failed. Exit code: '$stat'."
			return 1
		fi
	else
		echo "Tool '$tool' already installed: '$installed'."
	fi
	
	return 0
}

# Main
script=${0}
param=${1}

# Checking OS and user
os=`uname -s`	# Infos about the host os (e.g. Darwin, SunOS, Linux)
user=`whoami`	# This is the user who invoked the script

# Script is Linux only
if [ "$os" = "Linux" ]; then
	# Check script parameter
	case "$param" in
		install)
			InstallTool python3 "python3 python3-libs python3-setuptools python3-pip"
			exitcode=$?
			if [ $exitcode -eq 0 ]; then
				InstallTool java "java-1.8.0-openjdk"
				exitcode=$?
			fi
			;;
		-h | --help)
			echo "This script installs Python3 and Java if not alrady installed."
			echo "Syntax: $script install"
			;;
		*)
			echo "Please use '$script install' to install Python3 and Java."
	esac
else
	echo "Sorry, script '$script' does Linux only."
	exit 1	# Alternative: exitcode=1
fi

# Return result
exit $exitcode