#!/bin/bash
set -e

function echo_usage {
	echo "usage: configure [options] <package>"
	echo "	-a <arch>"
	echo "	-c : configure"
	echo "	-C <cross environment>"
	echo "	-d : compile"
	echo "	-i : install dir. default: /"
	echo "	-I : print this info"
	echo "	-p : pack default: do all"
	echo "	-v : set version"
	echo "	-V : version set by project"
}

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
	
	project=$(pwd)
	project=${project##*/}
	pushd .. >/dev/null
		mCM $project -b -an > /dev/null
		wc=$(wc $project.batch)
		rm $project.batch
		if [ "${wc:0:5}" != "0 0 0" ]
		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 1
	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 1
	fi
}

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

install_dir="/"
while [ $OPTIND -le "$#" ]
do
	if getopts "a:C:i:Iv:V" opt
	then
		case $opt in
			a) ARCH=$OPTARG
				;;
			C) cross=$OPTARG
				;;
			i)	install_dir=$OPTARG
				;;
			I)	echo_usage
				exit 0
				;;
			v)	optversion=$OPTARG
				;;
			V)	optversion="0.0"
				;;
			\?) echo "Invalid option: -$OPTARG"
				echo_usage
				exit 1
				;;
			:) echo "Option -$OPTARG requires an argument."
				echo_usage
				exit 1
				;;
		esac
	else
		paket="${!OPTIND}"
		eval OPTIND=OPTIND+1
	fi
done

if [ -z "$paket" ]
then
	echo_usage
	exit 1
fi

if [ -n "$ARCH" -a -n "$cross" ]
then
	echo "invalid options: supply -a for multiarch or -C for explicit cross compile environment"
	exit 1
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=$paket" >> debian/setenv.sh
echo "oldpack=\"$oldpack\"" >> debian/setenv.sh

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

# 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
# ./. ---------------------------------------------

# copy package control
if [ -f debian/$paket.control ]
then
	# proceed
	echo
else
	echo "warning: control file not found"
	echo "  this file is necessary for any package production."
fi

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

# compile prepare
if [ -x debian/$paket.build -o -e debian/$paket.cmake ]
then
    # build requrired
	echo "BUILD=build" >> debian/rules.pre
	if [ -n "$BUILD_DIR" ]
	then
		BUILD_DIR=.
	fi
else
	echo "BUILD=nobuild" >> debian/rules.pre
fi
# .build
if [ -x debian/$paket.build ]
then
	if [ -x debian/$paket.prebuild ]
	then
		pushd $BUILD_DIR >/dev/null
			. debian/setenv.sh
			debian/$paket.prebuild
		popd >/dev/null
	fi
fi
# .cmake
if [ -e debian/$paket.cmake ]
then
	cmake_check
fi

# pack prepare
if [ -f debian/$paket.cp -a -f debian/$paket.control ]
then
	echo "PACK=binary" >> debian/rules.pre
	if grep "^Architecture: *all" debian/$paket.control >/dev/null
	then
		echo "arch = all" >> debian/rules.pre
		echo 'BINARY_INDEP = copy ../$(paket)_$(version)-$(build)_all.deb' >> debian/rules.pre
	else
		echo 'arch = ${DEB_HOST_ARCH}' >> debian/rules.pre
		echo "BINARY_ARCH = copy ../${paket}_$version-${build}_"'$(arch).deb' >> debian/rules.pre
	fi
	if ! [ -f debian/$paket.changelog ]
	then
		echo "changelog_source = debian/default.changelog" >> debian/rules.pre
		if [ -f debian/default.changelog ]
		then
			rm debian/default.changelog
		fi
	fi
elif [ -f debian/$paket.cp ]
then
	echo "PACK=zip" >> debian/rules.pre
else
	echo "PACK=version" >> debian/rules.pre
fi