CXX = g++
CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 \
		   -I./src \
		   -I../src \
		   -isystem./ext/raylib/src \
		   -isystem./ext/raygui/src \
		   -isystem./ext/raygui/styles
LDFLAGS = -L./ext/raylib/src -lraylib -lm -lpthread -ldl -lrt -lX11

SRC_DIR = src
BUILD_DIR ?= build
RAYLIB_DIR = ext/raylib/src

CPP_SOURCES := $(wildcard $(SRC_DIR)/*.cpp)

CPP_OBJECTS = $(CPP_SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)

TARGET = ${BUILD_DIR}/orbit_sim

raylib:
	@if [ ! -f $(RAYLIB_DIR)/libraylib.a ]; then \
		cd $(RAYLIB_DIR) && $(MAKE) PLATFORM=PLATFORM_DESKTOP; \
	fi

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

$(TARGET): $(CPP_OBJECTS) raylib
	$(CXX) $(CPP_OBJECTS) -o $(TARGET) -L$(BUILD_DIR) -lorbit $(LDFLAGS)

$(CPP_OBJECTS): $(BUILD_DIR)/%.o : $(SRC_DIR)/%.cpp
	$(CXX) $(CXXFLAGS) -c $< -o $@

clean:
	rm -f $(TARGET)
	@for f in $(CPP_SOURCES); do rm -f $(BUILD_DIR)/$$(basename $${f%.cpp}.o); done

rebuild: clean all

all: raylib $(BUILD_DIR) $(TARGET)

.PHONY: all clean raylib rebuild