#!/bin/bash

builddir=./build

OPENWRTREV=42096
OPENWRTURL=svn://svn.openwrt.org/openwrt/branches/barrier_breaker
PACKAGEREV=${OPENWRTREV}
PACKAGEURL=svn://svn.openwrt.org/openwrt/packages


checkout_svn(){
	local DIRECTORY=$1
	local REPO_URL=$2
	local REVISION=$3

	echo checking out $REPO_URL to $DIRECTORY in version $REVISION
	if [ -d $DIRECTORY ]; then
		local url=$(svn info ${DIRECTORY} | awk '/^URL/ { print $2 }')
		if [ "$url" = "$REPO_URL" ]; then
			if [ -z "$REVISION" ]; then
				svn update $DIRECTORY
			else
				local rev=$(svn info $DIRECTORY | awk '/^Revision:/ { print $2 }')
				if [ "$rev" -ne "$REVISION" ]; then
					svn update -r $REVISION $DIRECTORY
				fi
			fi
		else
			echo wrong svn url -\> deleting whole directory
			/bin/rm -rf $DIRECTORY
			svn checkout -r $REVISION $REPO_URL $DIRECTORY
		fi
	else
		svn checkout -r $REVISION $REPO_URL $DIRECTORY
	fi
}

checkout_git(){
	local DIRECTORY=$1
	local REPO_URL=$2
	local COMMITID=$3

	local MYGIT="git -C $DIRECTORY"
	echo checking out $REPO_URL to $DIRECTORY in version $REVISION
	if [ -d $DIRECTORY ]; then
		if $MYGIT remote -v | grep $REPO_URL ; then
			echo Right remote detected
			if ! $MYGIT checkout $COMMITID ; then
				echo commitid not found trying to fetch new commits
				$MYGIT	pull && $MYGIT checkout $COMMITID
			fi
		else
			echo wrong remote or not an git repo at all -\> deleting whole directory
			/bin/rm -rf $DIRECTORY
			$MYGIT clone $REPO_URL $DIRECTORY
			$MYGIT checkout $COMMITID
		fi
	else
		echo We need to do a fresh checkout
		#needs to be without -C!!!
		git clone $REPO_URL $DIRECTORY
		$MYGIT checkout $COMMITID
	fi
}

get_source() {
	cd src

	#Get the OpenWrt Core Source for Firmware
	checkout_svn openwrt $OPENWRTURL $OPENWRTREV

	#checkout needed package feeds
	test -d packages || mkdir packages
	cd packages

	#get official openwrt package feed
	checkout_svn openwrt $PACKAGEURL $PACKAGEREV

	#get official openwrt routing package feed
	checkout_git routing https://github.com/openwrt-routing/packages.git 44318d05898069300ce2ad6eb05eb40f232e7123
	git -C routing	am --whitespace=nowarn ../../../build_patches/0001-batman-adv-no-rebroadcast-option.patch

	#checkout package feed containing fastd
	checkout_git fastd git://git.metameute.de/lff/pkg_fastd v14-1

	#checkout libremap package feed
	checkout_git libremap https://github.com/libremap/libremap-agent-openwrt.git 7194289d4b8a009df10613a3a88dc841fa26f423

	cd .. # packages
	cd .. # src
}

prepare() {
	get_source

	test -d $builddir || mkdir $builddir

	/bin/rm -rf $target
	svn export src/openwrt $target

	#apply own feeds.conf
	sed -e"s|PATH|$(pwd)/src/packages|g" ./build_patches/feeds.conf > $target/feeds.conf

	test -d $target/feeds && /bin/rm -rf $target/feeds

	$target/scripts/feeds update
	
	$target/scripts/feeds install -p packagesol nodewatcher
	$target/scripts/feeds install -p fastd fastd libuecc
	$target/scripts/feeds install -p libremap libremap-agent
	$target/scripts/feeds install -p routing alfred kmod-batman-adv kmod-batgat
	$target/scripts/feeds install -p openwrt bridge ethtool gpioctl-sysfs horst libugpio mii-tool wavemon kmod-gpiotoggling

	# todo evaluate this with the new openwrt
	# This changes the default behavior of sysupgrade to not save the config 
	cat build_patches/sysupgrade_no_config_save.patch | patch -p0 -d $target

	#saves ~200MB for each build
	test -d ./src/dl || mkdir ./src/dl
	ln -s ../../src/dl $target/dl

	board_prepare
}

prebuild() {
	#create filesdir for our config
	/bin/rm -rf $target/files
	mkdir $target/files

	cp -r ./bsp/default/root_file_system/* $target/files/
	cp -r ./bsp/$machine/root_file_system/* $target/files/
	cp ./bsp/$machine/.config $target/.config

	arch=$(awk -F= '/^CONFIG_TARGET_BOARD/{print gsub(/"/,"",$2); print $2;}' ./bsp/$machine/.config)
	version=$(awk '/^CONFIG_LINUX/ { sub(/CONFIG_LINUX_/,""); sub(/=y/,""); gsub(/_/,"."); print; }' ./bsp/$machine/.config)
	test -f ./bsp/$machine/.kernelconfig-$version && \
		cp ./bsp/$machine/.kernelconfig-$version \
		$target/target/linux/$arch/config-$version

	board_prebuild

    for template in $(find $target/files -name *.tpl); do
        echo "Translating $template .."
        $tpl_translate $template > $(dirname $template)/$(basename $template .tpl)
        /bin/rm $template
    done

	#insert actual firware version informations into release file
	version=$(git describe --tags --dirty)

	echo "FIRMWARE_VERSION=\"$version\"" > $target/files/etc/firmware_release
	echo "RELEASE_DATE=\"build date: "`date`"\"" >> $target/files/etc/firmware_release
	echo "FIRMWARE_REVISION=\"build date: "`date`"\"" >> $target/files/etc/firmware_release
	echo "OPENWRT_CORE_REVISION=\""${OPENWRTREV}"\"" >> $target/files/etc/firmware_release
	echo "OPENWRT_FEEDS_PACKAGES_REVISION=\""${PACKAGEREV}"\"" >> $target/files/etc/firmware_release
}

build() {
	prebuild

	opath=$(pwd)
	cd $target
	cpus=$(grep processor /proc/cpuinfo | wc -l)

	case "$1" in
		"debug")
			make V=99
			;;
		"fast")
			ionice -c 2 -- nice -n 1 -- make -j$[$cpus*2]
			;;
		*)
			ionice -c 3 -- nice -n 10 -- make -j$[$cpus+1]
			;;
	esac

	cd $opath

	if [ ! -d bin ]; then
		mkdir bin
	fi
	
	postbuild
}

config() {
	prebuild

	opath=$(pwd)
	cd $target

	case "$1" in
		"openwrt")
			make menuconfig
			;;
		"kernel")
			make kernel_menuconfig
			;;
	esac

	cd $opath

	save=""
	until [ "$save" = "y" -o "$save" = "n" ]; do
		echo "Do you want to save the generated config? (y/n)"
		read save
	done

	if [ "$save" = "y" ]; then
		case "$1" in
			"openwrt")
				grep '^CON\|^# CON' $target/.config | sort > ./bsp/$machine/.config
				;;
			"kernel")
				arch=$(awk -F= '/^CONFIG_TARGET_BOARD/{gsub(/"/,"",$2); print $2;}' ./bsp/$machine/.config)
				version=$(awk '/^CONFIG_LINUX/ { sub(/CONFIG_LINUX_/,""); sub(/=y/,""); gsub(/_/,"."); print; }' ./bsp/$machine/.config)
				grep '^CON\|^# CON' $target/target/linux/$arch/config-$version | sort > ./bsp/$machine/.kernelconfig-$version
				;;
		esac
	fi
}

postbuild() {
	board_postbuild
}

clean() {
	board_clean
	/bin/rm -rf bin $builddir
}

buildall() {
	for bsp in $(/bin/ls bsp/*.bsp); do
		./buildscript selectcommunity $1
		./buildscript selectbsp $bsp
		./buildscript prepare
		./buildscript build $2
	done
}

if [ "$1" != "selectbsp" -a "$1" != "selectcommunity" -a "$1" != "buildall" ]; then
	if [ ! -h selected_bsp ]; then
		echo "Please select a Board-Support-Package using:"
		echo "$0 selectbsp"
		exit
    fi
	if [ ! -h selected_community ]; then
		echo "Please select a community file using:"
		echo "$0 selectcommunity"
		exit
    fi
    echo "Working with $(/bin/ls -l selected_bsp | awk '{ print $11 }') and" \
        "$(/bin/ls -l selected_community | awk '{ print $11 }')"
    . selected_bsp
    tpl_translate=$(awk -F= 'BEGIN{printf("sed")} /^.+$/{gsub("/", "\\/", $0); printf(" -es/\\${%s}/%s/g",$1,$2)}' selected_community)
    echo
fi

case "$1" in
	"selectbsp")
		if [ "$2" = "help" ] || [ "$2" = "" ]; then
			echo "Select a Board-Support-Package:"
			echo
			echo "Usage: $0 $1 bsp"
			echo "available packages:"
			/bin/ls bsp/*.bsp
		else
            if [ ! -f $2 ]; then
                echo "Could not find $2"
            else
                /bin/rm -rf selected_bsp
                /bin/ln -s $2 selected_bsp
            fi
		fi
		;;
	"selectcommunity")
		if [ "$2" = "help" ] || [ "$2" = "" ]; then
			echo "Select a Community-File:"
			echo
			echo "Usage: $0 $1 community.cfg"
			echo "community.cfg: "
			/bin/ls community/*.cfg
		else
            if [ ! -f $2 ]; then
                echo "Could not find $2"
            else
                /bin/rm -rf selected_community
                /bin/ln -s $2 selected_community
            fi
		fi
		;;
	"prepare")
		if [ "$2" = "help" ] || [ "$2" = "x" ]; then
			echo "This option fetches the sources for the images and configurates the build so that it can be compiled"
			echo "Usage: $0 $1"
		else
			prepare
		fi
		;;
	"build")
		if [ "$2" = "help" ] || [ "$2" = "x" ]; then
			echo "This option compiles the firmware"
			echo "Normaly the build uses lower IO and System priorities, "
			echo "you can append \"fast\" option, to use normal user priorities"
			echo "Usage: $0 $1 [fast|debug]"
		else
			build "$2"
		fi
		;;
	"config")
		case "$2" in
			openwrt)
				config openwrt
				;;
			kernel)
				config kernel
				;;
			*)
				echo "This open the OpenWRT menuconfig dialog"
				echo
				echo "Usage: $0 $1 openwrt|kernel"
				;;
		esac
		;;
	"clean")
		if [ "$2" = "help" ] || [ "$2" = "x" ]; then
			echo "This option cleans all build files."
			echo "$0 $1"
		else
			clean
		fi
		;;
	"buildall")
		if [ "$2" = "help" ] || [ "$2" = "" ]; then
			echo "This option builds the firmware for all routers of a given community."
			echo "Usage: $0 $1 community.cfg [fast]"
			echo "community.cfg: "
			/bin/ls community/*.cfg
		else
			buildall $2 $3
		fi
		;;
	*)
		echo "This is the Build Environment Script of the Freifunk Community Franken."
		echo "Usage: $0 command"
		echo "command:"
		echo "	selectcommunity [communityfile]"
		echo "	selectbsp [bsp file]"
		echo "	prepare"
		echo "	config <openwrt|kernel>"
		echo "	build [<fast|debug>]"
		echo "	buildall <community> [<fast>]"
		echo "  clean"
		echo ""
		echo "If you need help to one of these options just type $0 command help"
	;;
esac
# vim: noexpandtab