CXX := g++
CXXFLAGS := -Wall -Wextra -std=c++11 -g -O2
LDFLAGS :=

OBJDIR := .objs

ifneq ($(value AI),)
	AI_UPPER := $(shell echo '$(value AI)' | tr a-z A-Z)
	AI_LOWER := $(shell echo '$(value AI)' | tr A-Z a-z)
else
	AI_UPPER := MC
	AI_LOWER := mc
endif

CXXFLAGS += -DAI=$(AI_UPPER)

MAIN_OBJ := $(OBJDIR)/main_$(AI_LOWER).o
CXX_SOURCES := $(filter-out main.cpp ai_%.cpp,$(wildcard *.cpp)) ai_$(AI_LOWER).cpp
OBJ_FILES := $(patsubst %.cpp,$(OBJDIR)/%.o,$(CXX_SOURCES)) $(MAIN_OBJ)
DEP_FILES := $(patsubst %.cpp,$(OBJDIR)/%.d,$(CXX_SOURCES)) $(MAIN_OBJ:.o=.d)

TARGET := ai$(AI_LOWER)

AI_ALL_LOWER := $(patsubst ai_%.cpp,%,$(wildcard ai_*.cpp))

TARGET_ALL := $(patsubst %,ai%,$(AI_ALL_LOWER))


.PHONY: all clean

all: $(TARGET)

clean:
	rm -f $(TARGET_ALL)
	rm -rf $(OBJDIR)

$(TARGET): $(OBJ_FILES) termio/libtermio.a
	@echo LD $@
	@$(CXX) $(CXXFLAGS) -o $@ $^ termio/libtermio.a $(LDFLAGS)

$(OBJDIR)/%.o: %.cpp termio/libtermio.a
	@mkdir -p $(dir $@)
	@echo CXX $<
	@$(CXX) $(CXXFLAGS) -c -o $@ $<

$(OBJDIR)/%.d: %.cpp termio/libtermio.a
	@mkdir -p $(dir $@)
	@echo DEP $<
	@$(CXX) -MT $(OBJDIR)/$*.o -MM $(CXXFLAGS) $< >$@

$(OBJDIR)/main_$(AI_LOWER).o: main.cpp termio/libtermio.a
	@mkdir -p $(dir $@)
	@echo CXX "$< -o $(notdir $@)"
	@$(CXX) $(CXXFLAGS) -c -o $@ $<

$(OBJDIR)/main_$(AI_LOWER).d: main.cpp termio/libtermio.a
	@mkdir -p $(dir $@)
	@echo DEP "$< -o $(notdir $@)"
	@$(CXX) -MT $(OBJDIR)/$*.o -MM $(CXXFLAGS) $< >$@

termio/.git:
	git submodule update --init

termio/libtermio.a: termio/.git $(wildcard termio/*.c termio/*.h)
	make -C termio

-include $(DEP_FILES)