#! /bin/bash
# vim: set tabstop=4 shiftwidth=4 noexpandtab filetype=sh:

# install_java - make sure we have java installed
#
# To the extent possible under law, T. Joseph Carter and Ivan Drucker have
# waived all copyright and related or neighboring rights to the a2cloud
# scripts themselves.  Software used or installed by these scripts is subject
# to other licenses.  This work is published from the United States.

# Find the path of our source directory
a2cSource="$( dirname "${BASH_SOURCE[0]}" )/.."
pushd $a2cSource >/dev/null
a2cSource="$PWD"
popd >/dev/null
if [[ ! -f "$a2cSource/.a2cloud_source" ]]; then
	printf "\na2cloud: cannot find a2cloud source directory in $a2cSource.\n\n"
	exit 1
fi

# Make sure ras2_{os,arch} get set
. "$a2cSource/scripts/system_ident" -q

check_freespace() {
	# we use df -k because its output works on Linux and BSD/Mac
	freeSpace=$(df -k / | tail -1 | awk '{ print $4 }')
	(( $freeSpace > 360000 ))
	return $?
}

install_java() {
	sudo apt-get update
	if [[ $ras2_os == rpi-* ]]; then
		sudo apt-get -y install oracle-java8-jdk
	else
		# Used to go out and find Oracle Java, but we don't need it.
		sudo apt-get -y install default-jre
	fi
	sudo apt-get clean
}

if ! hash java 2>/dev/null; then
	printf "\nJava is not installed"
	if check_freespace; then
		printf ", but we can install it.\n"

		install_java
	else
		cat <<-EOF
		 amd this script cannot continue.

		You don't seem to have enough free space to install Java, which is
		needed by several components we install (ADTPro and AppleCommander,
		for example.)  On a Raspberry Pi, it is possible that you may simply
		need to expand your filesystem to fill the SD card.  You can do that
		by running "sudo raspi-config" and selecting the appropriate option.

		If that's not the cause, you might investigate to see if you happen
		to have unwanted large packages installed.  Some systems come loaded
		with full desktop environments, development IDEs, or other large
		packages or package groups you don't need.

		Failing all of that, you can figure out how to get java installed and
		into your default path and set JAVA_HOME.  If we find java in your
		path this script will assume that we should simply use that.  We do
		recommend Java 8 or above.
		EOF
		exit 1
	fi
fi