#don't need to acutally change these varibles
EXT:=c++
H_EXT=h
CXX:=g++
RM:=rm -rf
MKDIR:=mkdir -p

#macros to move files from the source area to the objects area
TO_OBJS=$(strip $(patsubst $(SRC)/%,$(OBJS)/%,$(1)))
TO_SRC=$(strip $(patsubst $(OBJS)/%,$(SRC)/%,$(1)))

SRC_DIRS:=$(strip $(shell find $(SRC) -type d))
OBJS_DIRS:=$(strip $(patsubst $(SRC)/%,$(OBJS)/%,$(SRC_DIRS)))
ALL_CODE_FILES:=$(strip $(foreach DIR,$(SRC_DIRS), $(wildcard $(DIR)/*.$(EXT))))
ALL_OBJECT_FILES:=$(strip $(addsuffix .o, $(basename $(call TO_OBJS,$(ALL_CODE_FILES)))))
ALL_HEADER_FILES:=$(strip $(foreach DIR,$(SRC_DIRS), $(wildcard $(DIR)/*.$(H_EXT))))
ALL_SRC_FILES:=$(ALL_CODE_FILES) $(ALL_HEADER_FILES)

.PHONY: world prebuild postbuild clean final run restore backup

# Make everything in debug
world: CXXFLAGS:=$(BASE_FLAGS) $(DEBUG_FLAGS)
world: CXXLFLAGS:=$(BASE_LFLAGS) $(DEBUG_LFLAGS)
world: $(OUT)/depend.mk prebuild $(TARGET) postbuild

# Make a final build
final: CXXFLAGS:=$(BASE_FLAGS) $(FINAL_FLAGS)
final: CXXLFLAGS:=$(BASE_LFLAGS) $(FINAL_LFLAGS)
final: clean $(OUT)/depend.mk prebuild $(TARGET) postbuild
	$(RM) $(OBJS)

# Make and run
run: world
	$(TARGET)

# Make everything go away (be clean)
clean:
	$(RM) run
	$(RM) $(OUT)
	$(RM) $(TARGET)
	clear
	@ls --color

# Restore the most recent temp backup
restore:
	-mv -i $(SRC) $(SRC).old
	tar -xzf backup/current-build.tar.gz

backup: 
	@$(MKDIR)  backup/
	@tar -czf backup/$(basename $(notdir $(TARGET)))-`date +%Y-%m-%d-%H%M`.tar.gz $(SRC)/
	@echo "Backup Successful!"

# This is the actual code dependencies section
$(TARGET): $(ALL_OBJECT_FILES)
	$(CXX) $(CXXFLAGS) $(CXXLFLAGS) $+ -o $@

%.o:
	$(CXX) $(CXXFLAGS) -c $(call TO_SRC,$(basename $@).$(EXT)) -o $@

-include $(OUT)/depend.mk

# Support dependecies
$(OUT)/depend.mk: $(ALL_SRC_FILES)
	@$(MKDIR) $(OUT)
	@$(RM) $(OUT)/depend.mk
	set -e; $(CXX) -MM $(ALL_CODE_FILES) | sed -e "s,\.$(EXT)\.o,\.o," -e "s|^\(.*\)\.o: $(SRC)/\([^ ]*/\)\([^ /]*\)|\2\1.o: $(SRC)/\2\3|" -e "s,.*\.o,$(OBJS)/&," >> $(OUT)/depend.mk	

prebuild:
#	clear
	@$(MKDIR) $(OBJS)
	@for dir in $(OBJS_DIRS); do $(MKDIR) $${dir}; done

postbuild:
ifeq ($(GEN_RUN),yes)
	@ln -sf $(TARGET) run
endif
	@$(MKDIR)  backup/
	-@mv -f backup/$(basename $(notdir $(TARGET)))-last-build.tar.gz backup/$(basename $(notdir $(TARGET)))-last-build.tar.gz.old
	@tar -czf backup/$(basename $(notdir $(TARGET)))-last-build.tar.gz $(SRC)/
	@$(RM) backup/$(basename $(notdir $(TARGET)))-last-build.tar.gz.old