#!/bin/bash

builddir=./build

OPENWRTREV="861527622c343b2eebb483b5e723c103a6b6432f"
OPENWRTURL="git://git.openwrt.org/14.07/openwrt.git"
PACKAGEREV="289cc1505143e4b6cfaaabd452143e159dd22d25"
PACKAGEURL="https://github.com/openwrt/packages.git"

## Feed definition [0]: name aka directory [1]: url [2]: revision [3]: patches

#official openwrt packages
OPENWRT=(openwrt
         $PACKAGEURL
         $PACKAGEREV)
OPENWRT_PKGS="bridge gpioctl-sysfs libugpio mii-tool kmod-gpiotoggling"

OPENWRT_OLDPACKAGES=(openwrt_oldpackages
                     http://git.openwrt.org/14.07/packages.git
                     ee10403aab0b9b23096532662471e8052377444c)

#official openwrt routing packages
ROUTING=(routing
         https://github.com/openwrt-routing/packages.git
         44318d05898069300ce2ad6eb05eb40f232e7123
         ../../../build_patches/0001-batman-adv-no-rebroadcast-option.patch)
ROUTING_PKGS="kmod-batman-adv"

FASTD=(fastd
       git://git.metameute.de/lff/pkg_fastd
       v14-1)
FASTD_PKGS="fastd"

FEEDS=(OPENWRT OPENWRT_OLDPACKAGES ROUTING FASTD)

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 $COMMITID"
	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
			#needs to be without -C!!!
			git 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() {
	test -d src || mkdir src
	cd src

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

	test -d packages || mkdir packages
	cd packages

	#checkout needed package feeds
	for FEEDVAR in ${FEEDS[@]} ; do
		FEED=$FEEDVAR[@] FEED=( ${!FEED} )

		local NAME=${FEED[0]}
		local URL=${FEED[1]}
		local REV=${FEED[2]}
		local PATCH=${FEED[3]}

		checkout_git $NAME $URL $REV
		# Patches for feeds could be stored in known directories like build_patches/$NAME/
		# That way multiple patches for one feed could be supported
		if [ ! -z "$PATCH" ] ; then
			echo "Patching $PATCH"
			git -C $NAME am --whitespace=nowarn $PATCH
		fi
	done

	cd .. # packages
	cd .. # src
}

prepare() {
	get_source

	test -d $builddir || mkdir $builddir

	/bin/rm -rf $target
	cp -a src/openwrt $target

	## generate own feeds.conf
	#this local variable should be globally configure variable used in get_source and here
	local PACKAGEBASE=${PWD}/src/packages
	rm -f $target/feeds.conf
	for FEEDVAR in ${FEEDS[@]} ; do
		FEED=$FEEDVAR[@] FEED=( ${!FEED} )
		local NAME=${FEED[0]}
		echo "adding $NAME to package feeds"
		echo src-link $NAME $PACKAGEBASE/$NAME >> $target/feeds.conf
	done

	echo "cleaning feeds"
	/bin/rm -rf $target/feeds

	$target/scripts/feeds update

	for FEEDVAR in ${FEEDS[@]} ; do
		FEED=$FEEDVAR[@] FEED=( ${!FEED} )
		local NAME=${FEED[0]}
		local PACKAGESVAR=${FEEDVAR}_PKGS

		if [[ -n "${!PACKAGESVAR}" ]] ; then
			echo "adding ${!PACKAGESVAR} from feed $NAME to available packages"
			$target/scripts/feeds install -p $NAME ${!PACKAGESVAR}
		fi
	done

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

	#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 "BUILD_DATE=\"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 -c processor /proc/cpuinfo)

	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