CXX = g++
CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 \
		   -I./src \
		   -isystem./ext/tomlc17/src
LDFLAGS = -lm

SRC_DIR = src
BUILD_DIR ?= build
TEST_DIR = tests

CPP_SOURCES := $(wildcard $(SRC_DIR)/*.cpp)
C_SOURCES = ext/tomlc17/src/tomlc17.c
TEST_SOURCES := $(wildcard $(TEST_DIR)/*.cpp)

CPP_OBJECTS = $(CPP_SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
C_OBJECTS = $(BUILD_DIR)/tomlc17.o
TEST_OBJECTS := $(patsubst $(TEST_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(TEST_SOURCES))

LIBRARY = $(BUILD_DIR)/liborbit.a

all: lib test-build example

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

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

$(C_OBJECTS): $(BUILD_DIR)/%.o : $(C_SOURCES)
	$(CC) -Wall -Wextra -g -ggdb3 -std=c99 -I./src -I./ext/tomlc17/src -c $< -o $@

lib: $(BUILD_DIR) $(C_OBJECTS) $(CPP_OBJECTS)
	ar rcs $(LIBRARY) $(C_OBJECTS) $(CPP_OBJECTS)
	@echo "Built $(LIBRARY)"

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

test-build: lib $(BUILD_DIR) $(TEST_OBJECTS)
	$(CXX) $(TEST_OBJECTS) -o $(BUILD_DIR)/orbit_test -L$(BUILD_DIR) -lorbit -lCatch2Main -lCatch2 -lm

test: test-build
	./$(BUILD_DIR)/orbit_test

example: lib
	$(MAKE) -C example all BUILD_DIR=../$(BUILD_DIR)

clean:
	rm -rf $(BUILD_DIR) $(LIBRARY)
	$(MAKE) -C example clean

rebuild: clean all

.PHONY: all lib test-build test example clean rebuild