ANDROID_SDK=/usr/lib/android-sdk
ANDROID_TOOLS_ZIP=commandlinetools-linux-8092744_latest.zip

PROGRAM=cfps
LINCC := gcc -march=x86-64
WINCC := i686-w64-mingw32-gcc-win32 -march=pentium4
CFLAGS=-std=c99 -Wall -Wextra -Wpedantic -O3

# SDL
SDL_VER=2.30.3
SDL_DIR=SDL2-$(SDL_VER)
SDL_TAR=$(SDL_DIR).tar.gz
SDL_WIN_TAR=SDL2-devel-$(SDL_VER)-mingw.tar.gz

# Object files.
OBJECTS_LIN_DYNAMIC=
OBJECTS_LIN_STATIC=$(OBJECTS_LIN_DYNAMIC) libSDL2.a

# Dynamic libraries.
DYLIBS_LIN_STATIC=-lm -ldl -pthread
DYLIBS_LIN_DYNAMIC=-lSDL2 $(DYLIBS_LIN_STATIC)

# PC stuff.

$(PROGRAM): $(OBJECTS_LIN_DYNAMIC) src/$(PROGRAM).c include/*
	# Building for GNU/Linux (dynamic SDL).
	$(LINCC) $(CFLAGS) -o $@ -Iinclude src/$(PROGRAM).c $(OBJECTS_LIN_DYNAMIC) -Wl,-rpath,. -L. $(DYLIBS_LIN_DYNAMIC)

$(PROGRAM)-static: $(OBJECTS_LIN_STATIC) src/$(PROGRAM).c include/*
	# Building for GNU/Linux (static SDL).
	$(LINCC) $(CFLAGS) -o $@ -Iinclude src/$(PROGRAM).c $(OBJECTS_LIN_STATIC) -Wl,-rpath,. -L. $(DYLIBS_LIN_STATIC)

# Android stuff.

android:
	PATH="/usr/lib/android-ndk:$PATH" && \
	PATH="/usr/lib/android-sdk/tools:$PATH" && \
	PATH="/usr/lib/android-sdk/platform-tools:$PATH" && \
	export ANDROID_HOME=/usr/lib/android-sdk && \
	export ANDROID_SDK_ROOT=$ANDROID_HOME && \
	export ANDROID_NDK_HOME=$ANDROID_HOME/ndk/21.3.6528147/ && \
	cd SDL2-2.0.20/build-scripts && \
	./androidbuild.sh com.mse.$(PROGRAM) ../../src/$(PROGRAM).c && \
	cd ../build/com.mse.$(PROGRAM) && \
	./gradlew --offline --no-rebuild installDebug

# Needs to run as root because apparently phase 2 of the NDK installation happens in this step.
android-deprecated: ccstrap .ndk .license-check
	cp -rf include/* SDL2-2.0.20/include/
	sudo ./ccstrap

# Needs to run as root because it installs the NDK in the SDK folder.
.ndk: .cmdline-tools
	yes | sudo ./cmdline-tools/bin/sdkmanager --sdk_root=$(ANDROID_SDK) --install "ndk;21.3.6528147" --channel=0
	touch $@

.license-check: .cmdline-tools
	yes | ./cmdline-tools/bin/sdkmanager --sdk_root=$(ANDROID_SDK) --licenses
	touch $@

.cmdline-tools: $(ANDROID_TOOLS_ZIP)
	unzip $(ANDROID_TOOLS_ZIP)
	touch $@

$(ANDROID_TOOLS_ZIP):
	wget https://dl.google.com/android/repository/$(ANDROID_TOOLS_ZIP)

# Build SDL2 for Linux as compatibly as possible.
libSDL2.a: $(SDL_DIR)
	rm -r -f $(SDL_DIR)/build
	mkdir -p $(SDL_DIR)/build
	export CC="$(LINCC)" ;\
	cd $(SDL_DIR)/build; ../configure --disable-sndio --disable-esd \
	--disable-arts --disable-video-directfb --disable-rpath \
	--enable-alsa --enable-alsa-shared --enable-pulseaudio \
	--enable-pulseaudio-shared --enable-x11-shared --enable-sdl-dlopen \
	--disable-input-tslib CFLAGS="-O3" && make
	cp $(SDL_DIR)/build/build/.libs/libSDL2.a $@
	touch $@

$(SDL_DIR): $(SDL_TAR)
	$(RM) -r $@
	tar xzvf $(SDL_TAR) $@
	touch $@

$(SDL_TAR):
	wget https://libsdl.org/release/$(SDL_TAR)

clean:
	$(RM) $(PROGRAM) $(PROGRAM)-static

distclean: clean
	rm -rf $(OBJECTS_LIN_STATIC) $(SDL_DIR)