#!/usr/bin/env sh

cd "$(dirname "$0")" || exit 1

mode="${1}"
network="rtl8139"

qemu_with_flags() {
	if [ "${mode}" = "image" ] || [ "${mode}" = "image_debug" ]; then
		# TODO: Find out why kvm install is incredibly slow
		SDL_VIDEO_X11_DGAMOUSE=0 qemu-system-i386 -no-reboot -vga std -smp "$(nproc)" -serial mon:stdio -rtc base=localtime -m 256M -net nic,model=${network},macaddr=42:42:42:42:42:42 -net user "$@"
	else
		SDL_VIDEO_X11_DGAMOUSE=0 qemu-system-i386 -no-reboot -vga std -serial stdio -rtc base=localtime -m 256M -net nic,model=${network},macaddr=42:42:42:42:42:42 -net user "$@"
	fi
}

make_cross() {
	if [ ! -d "./cross/" ]; then
		# Create directory
		mkdir -p cross
		cd cross || exit 1
		DIR=$(pwd)

		# Get sources
		mkdir "${DIR}/src" && cd "${DIR}/src" || exit 1
		echo "Downloading..."
		curl -sSL "https://ftp.gnu.org/gnu/binutils/binutils-2.32.tar.xz" | tar xJ
		curl -sSL "https://ftp.gnu.org/gnu/gcc/gcc-9.2.0/gcc-9.2.0.tar.xz" | tar xJ

		# Prepare compiling
		mkdir -p "${DIR}/opt/bin"
		export PREFIX="${DIR}/opt"
		export TARGET=i686-elf
		export PATH="$PREFIX/bin:$PATH"

		# Compile binutils
		mkdir "${DIR}/src/build-binutils" && cd "${DIR}/src/build-binutils" || exit 1
		../binutils-2.32/configure --target="$TARGET" --prefix="$PREFIX" --with-sysroot --disable-nls --disable-werror
		make
		make install

		# Compile GCC
		mkdir "${DIR}/src/build-gcc" && cd "${DIR}/src/build-gcc" || exit 1
		../gcc-9.2.0/configure --target="$TARGET" --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --without-headers
		make all-gcc
		make all-target-libgcc
		make install-gcc
		make install-target-libgcc

		cd "${DIR}/.." || exit 1
	else
		# Should be sourced to take effect
		cd cross || exit 1
		DIR=$(pwd)
		export PREFIX="${DIR}/opt"
		export TARGET=i686-elf
		export PATH="$PREFIX/bin:$PATH"
		cd ..
	fi
}

make_build() {
	mkdir -p iso/

	echo "Building..."
	mkdir -p build
	cd build || exit 1
	cmake .. >/dev/null || exit 1
	make || exit 1
	cd ..

	# Create disk image
	mke2fs -b 1024 -N 1024 ./build/disk.img 65536 || exit 1
	mkdir ./mnt/ || exit 1
	sudo mount ./build/disk.img ./mnt/ || exit 1
	sudo mkdir -p ./mnt/abc/def/
	echo "Bananenkuchen" | sudo tee -a ./mnt/test
	echo "toll" | sudo tee -a ./mnt/abc/def/baum
	sync && sudo umount mnt || exit 1
	rm -r mnt/

	# Create ISO
	mkdir -p ./iso/boot/grub/
	cp ./build/kernel.bin ./iso/boot/kernel.bin
	cp ./src/bootloader/grub.cfg ./iso/boot/grub/
	grub-mkrescue -o ./build/melvix.iso ./iso/ || exit 1

	printf "Build finshed successfully!\n\n"
}

make_test() {
	qemu_with_flags -cdrom ./build/melvix.iso -hda ./build/disk.img
}

make_debug() {
	qemu_with_flags -s -cdrom ./build/melvix.iso #-drive file=./build/hdd10M.img,format=raw
}

make_image_debug() {
	qemu_with_flags -cdrom ./build/melvix.iso #-drive file=./build/hdd10M.img,format=raw
	#qemu_with_flags -drive file=./build/hdd10M.img,format=raw
}

make_image() {
	#start=$(date +%s.%N)
	#qemu_with_flags -nographic -cdrom ./build/melvix.iso -drive file=./build/hdd10M.img,format=raw >install.log
	#end=$(date +%s.%N)
	#cat install.log
	#printf "[LOG END]\n\n"
	#tail install.log | grep -q "Installation successful!" && echo Booted and installed within "$(echo "$end - $start" | bc -l)" seconds || echo Installation failed! && exit 1
	#rm install.log
	echo "This test is currently disabled"
}

make_sync() {
	rm tags compile_commands.json
	ctags -R --exclude=.git --exclude=build --exclude=iso --exclude=cross .
	mkdir -p cmake
	cd cmake || exit 1
	cmake .. >/dev/null
	mv compile_commands.json ..
	cd .. || exit 1
}

make_tidy() {
	find ./src -type f -name "*.sh" | xargs -l -i sh -c 'shfmt -w {}'
	shfmt -w ./run
	find ./src -type f -regex '.*\.\(c\|h\)' -exec clang-format -i {} \;
	find ./src -type f | xargs -l -i sh -c 'printf %s "$(< {})" > {}'
}

make_font() {
	cd ./src/resources/ || exit 1
	sh conv.sh
	cd ../../ || exit 1
}

make_clean() {
	rm -rf ./build ./iso
}

if [ "${mode}" = "cross" ]; then
	make_cross
elif [ "${mode}" = "build" ]; then
	make_cross
	make_clean
	make_build
elif [ "${mode}" = "clean" ]; then
	make_clean
elif [ "${mode}" = "test" ]; then
	make_cross
	make_clean
	make_build
	make_test
elif [ "${mode}" = "again" ]; then
	make_test
elif [ "${mode}" = "debug" ]; then
	make_debug
elif [ "${mode}" = "image_debug" ]; then
	make_cross
	make_clean
	make_build
	make_image_debug
elif [ "${mode}" = "image" ]; then
	make_cross
	make_clean
	make_build
	make_image
elif [ "${mode}" = "sync" ]; then
	make_sync
elif [ "${mode}" = "tidy" ]; then
	make_tidy
elif [ "${mode}" = "font" ]; then
	make_font
	make_tidy
else
	echo "Please use the following syntax:"
	echo "./run {cross | build | clean | test | debug | image | sync | tidy | font}"
fi