#! /bin/bash

# Imports
source /etc/make.conf
BASE_DIR="/usr/local/update"
REMOTE_DIR="http://www.felixpetzold.de/Gentoo/update"

# Functions
function ebuild_name() {
	echo "$(ls *.ebuild 2> /dev/null | sort -r | head -n 1 )"
}

function is_installed() {
	# ${1} must be the full qualified package name like sys-apps/portage
	if (test $(eix ${1} | grep -i Installed | cut -c 27 | head -n 1) -ge "0" 2> /dev/null)
	then
		true
	else
		false
	fi
}

function install_script() {
	mkdir -p ${PORTDIR_OVERLAY}/app-admin/update
	cd ${PORTDIR_OVERLAY}/app-admin/update
	rm -rf *
	echo "Downloading app-admin/update-${LATEST_VERSION}"
	wget ${REMOTE_DIR}/update-${LATEST_VERSION}.tar.gz >> /dev/null
	echo "Extracting app-admin/update-${LATEST_VERSION}"
	tar -xpf update-${LATEST_VERSION}.tar.gz >> /dev/null
	rm -f update-${LATEST_VERSION}.tar.gz
	rm -f Manifest 2> /dev/null >> /dev/null
	ebuild $(ebuild_name) manifest >> /dev/null
	if $(is_installed app-admin/update)
	then
		if ($(cat ${PORTDIR_OVERLAY}/app-admin/update/*.ebuild | grep app-portage/eix- | cut -d"-" -f3) != $(eix app-portage/eix | grep Installed | cut -d" " -f9 | cut -d"(" -f1))
		then
			emerge -1 autounmask >> /dev/null
			autounmask app-admin/update-${LATEST_VERSION}
		else		
			if ($(cat ${PORTDIR_OVERLAY}/app-admin/update/*.ebuild | grep sys-apps/portage- | cut -d"-" -f3) != $(eix sys-apps/portage | grep Installed | cut -d" " -f9 | cut -d"(" -f1))
			then
				emerge -1 autounmask >> /dev/null
				autounmask app-admin/update-${LATEST_VERSION}
			else
				echo "no need to run autounmask. "
			fi
		fi
	else
		echo "unmasking dependencies with autounmask"
		if $(is_installed app-portage/autounmask)
		then
			echo "your already have autounmask installed. No need to emerge it"
		else
			echo "no autounmask installed. emerging it"
			emerge -1 autounmask >> /dev/null
		fi
		autounmask app-admin/update-${LATEST_VERSION}
	fi
	echo "emerging app-admin/update-${LATEST_VERSION} now"
	emerge update >> /dev/null
	echo "done. you can use my script now. THX for trying it"
}

# Executive Area
clear
if (test -f ${BASE_DIR}/update)
then
	# Update vorhanden?
	INSTALLED_VERSION="$(cat ${BASE_DIR}/update | grep myVersion= | cut -d"\"" -f2)" 2> /dev/null
	echo "Installed version: app-admin/update-${INSTALLED_VERSION}"
	cd /tmp
	wget ${REMOTE_DIR}/latest-version.txt >> /dev/null
	LATEST_VERSION="$(cat latest-version.txt)"
	rm -f latest-version.txt
	echo "Latest version:    app-admin/update-${LATEST_VERSION}"
	if (test ${LATEST_VERSION} == ${INSTALLED_VERSION} 2> /dev/null)
	then
		echo "Your version is up to date"
	else
		echo "Updating your version"
		install_script
	fi
else
	# Installation
	cd /tmp
	wget ${REMOTE_DIR}/latest-version.txt 2> /dev/null >> /dev/null
	LATEST_VERSION="$(cat latest-version.txt)"
	rm -f latest-version.txt
	echo "Latest version: app-admin/update-${INSTALLED_VERSION}"
	install_script
fi