#!/bin/bash
set -e

function echo_usage {
	echo "usage: configure [options] <package>"
	echo "--- general options ---"
	echo "  -h : print this info"
	echo "--- compile options ---"
	echo "  -a <arch>"
	echo "  -c <compile type: NONE|CPP|CMAKE|PDF|ANY> default: NONE"
	echo "  -C <cross environment>"
	echo "  -d <compile_dir>"
	echo "  -e <compile_target>"
	echo "--- build target options ---"
	echo "  -i : install dir. default: /, nec. for make install"
	echo "  -n <target_name>: default: <package>"
	echo "  -t <target_type: FILE|DEB|ZIP>, nec. for make pack"
	echo "  -v : set version"
	echo "  -V : version set by project"
}

function create_build {
	pushd $BUILD_DIR >/dev/null
		if [ "$compile_type" == "PDF" ]
		then
			echo "cd $compile_dir" >  debian/$paket.build
			echo "make $compile_target" >> debian/$paket.build
			chmod 755 debian/$paket.build
		else
			echo "build for compile_type not implemented."
			exit 10
		fi
	popd >/dev/null
}
function cmake_check {
	pushd ../build >/dev/null
		# do checks
		if [ -e debian/$paket.build ]
		then
			echo "cmake is not compatible with other builds. Remove $paket.build"
			exit 1
		fi
		if [ -e debian/$paket.prebuild ]
		then
			echo "cmake is not compatible with other builds. Remove $paket.prebuild"
			exit 2
		fi
		
		if [ -n "$cross" ]
		then
			# inject cross toolset
			echo "set (CMAKE_MODULE_PATH $cross)" > CMakeLists.txt
			echo "include(toolset)" >> CMakeLists.txt
			cat debian/$paket.cmake >> CMakeLists.txt
		else
			cp debian/$paket.cmake CMakeLists.txt
		fi

		echo "make" > debian/$paket.build
		chmod 755 debian/$paket.build
		cmake .
	popd >/dev/null
}
function check_unversioned {
	# has to be called in the projects base directory
	# result: "M" in stdout or nothing
	set -e
	
	# check if build is running in a sandbox
	if ! [ -f .cm.ignore ]
	then
		# we create one
		echo ".cm.ignore" > .cm.ignore
		echo "debian.*" >> .cm.ignore
		echo "up.*" >> .cm.ignore
	fi

	# add auto created files to .cm.ignore
	if ! grep Makefile .cm.ignore >/dev/null ; then echo "Makefile" >>.cm.ignore; fi
	if ! grep configure .cm.ignore >/dev/null ; then echo "configure" >>.cm.ignore; fi
	if ! grep debian/rules .cm.ignore >/dev/null ; then echo "debian/rules" >>.cm.ignore; fi
	if ! grep debian/rules.pre .cm.ignore >/dev/null ; then echo "debian/rules.pre" >>.cm.ignore; fi
	if ! grep debian/setenv.sh .cm.ignore >/dev/null ; then echo "debian/setenv.sh" >>.cm.ignore; fi
	if ! grep debian/tmp .cm.ignore >/dev/null ; then echo "debian/tmp" >>.cm.ignore; fi
	
	project=$(pwd)
	project=${project##*/}
	pushd .. >/dev/null
		mCM $project -b -an > /dev/null
		wc=$(wc $project.batch)
		rm $project.batch
		if [ "${wc:0:1}" != "1" ]
		then
			echo "M"
		fi
	popd >/dev/null
}

function set_build {
	set -e
	if [ -e .svn ]
	then
		version="0.0"
		build=$(svnversion)
		build=${build/:/-}
		build="$build$(check_unversioned)"
	elif [ -e .git ]
	then
		tag=$(git describe --tags --match "${paket}_*" 2>/dev/null) || true
		if test -z "$tag"
		then
			# try generic "v_" tag
			tag=$(git describe --tags --match "v_*" 2>/dev/null) || true
		fi
		if test -z "$tag"
		then
			tag="0.0-0TOP"
		fi
		changes=$(check_unversioned)
		tag="$tag$changes"
		version=${tag##*_}
		version=${version%%-*}
		build=${tag##*-}
	else
		echo "No configuration system found. Cannot determine version."
		exit 3
	fi
}

function check_version {
	set -e
	
	vline=$(head -1 debian/$paket.changelog)
	vline=${vline%-*}
	clversion=${vline#*(}
	if [ $version = "0.0" ]
	then
		version=$clversion
		return
	fi

	# do no check on a modified git repos
	if [ "${build: -1}" == "M" ]
	then
		return
	fi

	if [ "$clversion" != $version ]
	then
		echo "version mismatch: git: $version, changelog: $clversion"
		exit 4
	fi
}

function add_sources {
	echo "Anz: $#"
	for suf in $*
	do
		find . -name "*.$suf" -exec echo "  "{}" \\" >> make.pre \;
	done
	if [ $# -eq 2 ]
	then
		rm make.tmp || true
		find . -name "*.$2" -exec echo {} >> make.tmp \;
		while read line
		do
			echo "  ${line/\.$2/\.$1}  \\" >> make.pre
		done < make.tmp
	fi
}

##############################################################################
# Main program
##############################################################################

install_dir="/"
compile_type=NONE
extern_build=0

while [ $OPTIND -le "$#" ]
do
	if getopts "ha:bc:C:d:e:i:n:t:v:V" opt
	then
		case $opt in
			h)	echo_usage
				exit 0
				;;
			a) ARCH=$OPTARG
				;;
			b) extern_build=1
				;;
			c) compile_type=$OPTARG
				;;
			C) cross=$OPTARG
				;;
			d) compile_dir=$OPTARG
				;;
			d) compile_target=$OPTARG
				;;
			i)	install_dir=$OPTARG
				;;
			n)	target_name=$OPTARG
				;;
			t) target_type=$OPTARG
				;;
			v)	optversion=$OPTARG
				;;
			V)	optversion="0.0"
				;;
			\?) echo "Invalid option: -$OPTARG"
				echo_usage
				exit 5
				;;
			:) echo "Option -$OPTARG requires an argument."
				echo_usage
				exit 6
				;;
		esac
	else
		paket="${!OPTIND}"
		eval OPTIND=OPTIND+1
	fi
done

if [ -z "$paket" ]
then
	echo_usage
	exit 7
fi

# read build configuration, if existing
#if [ -f debian/$paket.conf ]
#then
#	. debian/$paket.conf
#fi

if [ -n "$ARCH" -a -n "$cross" ]
then
	echo "invalid options: supply -a for multiarch or -C for explicit cross compile environment"
	exit 8
fi

if [ ! -e Makefile ]
then
	ln -s /usr/share/mbuild/rules Makefile
fi

# delete changelog and control
rm debian/changelog debian/control debian/README.debian debian/copyright 2>/dev/null || true

# mconfigure builds 2 environment files: setenv.sh + rules.pre
echo "paket=$paket" > debian/rules.pre
echo "INSTALL_DIR=$install_dir" >> debian/rules.pre
if [ -e debian/setenv.sh ]; then rm debian/setenv.sh; fi

if [ -n "$cross" ]
then
	if [ ${cross:0:1} != "/" ]
	then
		cross="/opt/cross/$cross"
		#export $cross
	fi
	if [ -f "$cross/setenv.sh" ]
	then
		. "$cross/setenv.sh"
		cp $cross/setenv.sh debian/setenv.sh
	fi
	if [ -z "$ARCH" ]
	then
		# determine architecture
		GNU_ARCH=${cross%-*} # assumed format: DEB_HOST_GNU_TYPE-g++version, e.g. arm-linux-gnueabihf-4.9
		GNU_ARCH=${GNU_ARCH##*/}
		arch_opt="-t $GNU_ARCH"
	fi
fi

if [ -n "$ARCH" ]
then
	arch_opt="-a $ARCH"
fi
dpkg-architecture $arch_opt >> debian/setenv.sh

echo "paket=$paket" >> debian/setenv.sh

set_build
if [ -z "$optversion" ]
then
	check_version
else
	version=$optversion
fi
echo "version=$version" >> debian/rules.pre
echo "version=$version" >> debian/setenv.sh
echo "build=$build" >> debian/rules.pre
echo "build=$build" >> debian/setenv.sh

# get repository name
#	tmp=$(pwd)
#	pwd=${tmp##*/}
#	pwd=${pwd,,*}
#	echo "pwd=$pwd" >> debian/rules.pre

echo "building $paket with version/build=$version-$build"

pushd debian >/dev/null
# ./debian -------------------------------------

ln -sf /usr/share/mbuild/rules .

if [ -e tmp ]
then
	rm -rf tmp
fi

# check for pre/post installation scripts
if [ -f $paket.preinst ]
then
	echo "add_inst_tgt += debian/tmp/DEBIAN/preinst" >> rules.pre
fi
if [ -f $paket.postinst ]
then
	    echo "add_inst_tgt += debian/tmp/DEBIAN/postinst" >> rules.pre
fi
if [ -f $paket.prerm ]
then
	    echo "add_inst_tgt += debian/tmp/DEBIAN/prerm" >> rules.pre
fi
if [ -f $paket.postrm ]
then
	    echo "add_inst_tgt += debian/tmp/DEBIAN/postrm" >> rules.pre
fi

# check for README.debian
if [ -f $paket.README.debian ]
then
	    cp $paket.README.debian README.debian
fi

mkdir -p tmp/DEBIAN

# add export to setenv.sh
sed -i "s/^/export /" setenv.sh

popd >/dev/null
# ./. ---------------------------------------------

# build prepare
if [ -x debian/$paket.prepare ]
then
	. debian/setenv.sh
	debian/$paket.prepare
fi

if [ "$compile_type" == "NONE" ]
then
	echo "BUILD=nobuild" >> debian/rules.pre
else
	echo "BUILD=build" >> debian/rules.pre

	if [ $extern_build -eq 1 ]
	then
		BUILD_DIR=~/build
		echo "BUILD_DIR=~/build" >> debian/rules.pre
		debian/rules sync
	fi

	# .build
	if [ "$compile_type" != "CMAKE" -a "$compile_type" != "ANY" ]
	then
		cp debian/rules.pre $BUILD_DIR/$compile_dir/make.pre
		pushd $BUILD_DIR/$compile_dir >/dev/null
			ln -sf /usr/share/mbuild/makefile .
			if [ -n "$sources_suffix" ]
			then
				echo "SOURCES = \\" >> make.pre
				for suf in $sources_suffix
				do
					find . -name "*.$suf" -exec echo "  "{}" \\" >> make.pre \;
				done
				echo >> make.pre
			fi
		popd >/dev/null
	fi

	if [ "$compile_type" == "PDF" ]
	then
		pushd $BUILD_DIR/$compile_dir >/dev/null
			echo "SOURCES = \\" >> make.pre
			add_sources tex xml
			echo >> make.pre
		popd >/dev/null
	fi
	if [ -x debian/$paket.prebuild ]
	then
		pushd $BUILD_DIR >/dev/null
			. debian/setenv.sh
			debian/$paket.prebuild
		popd >/dev/null
	fi
	if ! [ -x debian/$paket.build -o -f debian/$paket.cmake ]
	then
		create_build
	fi

	# .cmake
	if [ -e debian/$paket.cmake ]
	then
		cmake_check
	fi
fi