#!/bin/bash

love_suffix="$1"
love_amsuffix="$(echo "$love_suffix" | sed 's/\-/_/g' | sed 's/\./_/g')"

flags=""
upper()
{
	echo "$@" | tr '[:lower:]' '[:upper:]'
}

implfind()
{
	find "$1" -maxdepth 1 -type d -exec basename '{}' \; | grep -v "^\." | tail -n +2
}

sourcefind()
{
	find "$1" $2 -type f \( -iname "*.c" -o -iname "*.cpp" -o -iname "*.h" -o -iname "*.hpp" -o -iname "*.lch" \) | awk "{print \"./$prefix\"\$0\" \\\\\"}" | grep -v -f"$LOVEROOT/platform/unix/exclude"
}

handlemodule()
{
	module="$1"
	DEFINENAME="LOVE_MODULE_$(upper "$module")"
	printf "$DEFINENAME"
}

handleimpl()
{
	module="$1"
	implementation="$2"
	name="$3"

	printf "if $name\n"
	FILES="$(sourcefind "$module/$implementation" | sed "s/^/    /")"
	if [[ "x$FILES" != "x" ]]; then
		printf "liblove${love_amsuffix}_la_SOURCES += \\\\\n"
		printf "${FILES:0:${#FILES}-2}\n"
	fi
	printf "endif\n\n"
}

genmodules()
{
	LOVEROOT="$(pwd)"
	cd src

	printf "liblove${love_amsuffix}_la_SOURCES = \\\\\n"
	sourcefind "common" | sed "s/^/    /"
	FILES="$(sourcefind "scripts" | sed "s/^/    /")"
	printf "${FILES:0:${#FILES}-2}\n\n"

	cd modules
	prefix="modules/"
	for module in *; do
		NAME=$(handlemodule "$module")
		flags="$flags module-$module"

		printf "if $NAME\n"

		for implementation in $(implfind "$module"); do
			flags="$flags implementation-$module-$implementation"
			handleimpl "$module" "$implementation" "LOVE_IMPLEMENTATION_$(upper "$module")_$(upper "$implementation")"
		done

		FILES="$(sourcefind "$module" "-maxdepth 1" | sed "s/^/    /")"
		if [[ "x$FILES" != "x" ]]; then
			printf "liblove${love_amsuffix}_la_SOURCES += \\\\\n"
			printf "${FILES:0:${#FILES}-2}\n"
		fi

		printf "endif\n\n"
	done

	cd ../libraries
	prefix="libraries/"
	for library in *; do
		NAME="LOVE_LIBRARY_$(upper "$library")"
		flags="$flags library-$library"
		FILES="$(sourcefind "$library" | sed "s/^/    /")"

		if [[ ${#FILES} -gt 2 ]]; then
			printf "if $NAME\n"
			printf "liblove${love_amsuffix}_la_SOURCES += \\\\\n"
			printf "${FILES:0:${#FILES}-2}\nendif\n\n"
		fi
	done
	cd ../..
}

genflags()
{
	for flag in $flags; do
		prettyflag="$(echo "$flag" | sed 's/-/ love./' | sed 's/-/./g')"
		varflag="enable_$(echo "$flag" | sed 's/^[^-]*-//' | sed 's/[^a-zA-Z0-9]/_/')"
		defineflag="LOVE_ENABLE_$(upper $(echo $flag | sed 's/^[^-]*-//' | sed 's/-/_/g'))"
		amflag="$(upper $(echo love-$flag | sed 's/-/_/g'))"
		printf "AC_ARG_ENABLE([$flag], [  --disable-$flag    Turn off $prettyflag], [], [$varflag=true])\n"
		printf "AH_TEMPLATE([$defineflag], [])\n"
		printf "if test x\"\$$varflag\" = xtrue; then\n"
		printf "    AC_DEFINE([$defineflag], [])\n"
		printf "fi\n"
		printf "AM_CONDITIONAL([$amflag], [test x\$$varflag = xtrue])\n\n"
	done
}

echo Generating src/Makefile.am ...
inc_current='$(srcdir)'
inc_modules="$inc_current/modules"
inc_libraries="$inc_current/libraries"

cat > src/Makefile.am << EOF
AM_CPPFLAGS = -I$inc_current -I$inc_modules -I$inc_libraries -I$inc_libraries/enet/libenet/include \$(LOVE_INCLUDES) \$(FILE_OFFSET)\
	\$(SDL_CFLAGS) \$(lua_CFLAGS) \$(freetype2_CFLAGS)\
	\$(openal_CFLAGS) \$(zlib_CFLAGS) \$(libmodplug_CFLAGS)\
	\$(vorbisfile_CFLAGS) \$(theora_CFLAGS)
AUTOMAKE_OPTIONS = subdir-objects
SUBDIRS =
SUFFIXES = .lua .lua.h

if LOVE_BUILD_EXE
# LÖVE executable
bin_PROGRAMS = love${love_suffix}
#love_LDFLAGS =
love${love_amsuffix}_LDADD = liblove${love_suffix}.la \$(lua_LIBS)
love${love_amsuffix}_SOURCES = love.cpp

if LOVE_TARGET_OSX
love${love_amsuffix}_LIBTOOLFLAGS = --tag=OBJCXX
love${love_amsuffix}_SOURCES += \\
    ./common/macosx.mm
else
love${love_amsuffix}_LIBTOOLFLAGS = --tag=CXX
endif
endif

# Compile scripts
.lua.lua.h:
	cd scripts; \
	\$(LUA_EXECUTABLE) auto.lua \$<

# libLÖVE
lib_LTLIBRARIES = liblove${love_suffix}.la
liblove${love_amsuffix}_la_LDFLAGS = -module -export-dynamic \$(LDFLAGS)
liblove${love_amsuffix}_la_LIBADD = \
	\$(SDL_LIBS) \$(freetype2_LIBS) \$(lua_LIBS)\
	\$(openal_LIBS) \$(zlib_LIBS) \$(libmodplug_LIBS)\
	\$(vorbisfile_LIBS) \$(theora_LIBS)
EOF

genmodules >> src/Makefile.am

cat >> src/Makefile.am << EOF
if !LOVE_NOMPG123
liblove${love_amsuffix}_la_SOURCES += \\
    ./modules/sound/lullaby/Mpg123Decoder.cpp \\
    ./modules/sound/lullaby/Mpg123Decoder.h
endif
EOF

echo "src/Makefile.am is updated! ^.^"

echo "Generating configure-modules.ac"
genflags > configure-modules.ac
cat >> configure-modules.ac << EOF
AC_SUBST([LOVE_SUFFIX], [${love_suffix}])
EOF
echo "configure-modules.ac is updated! ^.^"