#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program. If not, see <http://www.gnu.org/licenses/>.

#Copyright 2018-2019 rexy712


ifeq ($(OS),Windows_NT)
	WINDOWS=1
endif

SOURCE_DIRS:=src/raii src/matrix
OBJDIR:=obj
DEPDIR:=$(OBJDIR)/dep
INCLUDE_DIRS:=include
EXT:=cpp
MAIN_LIBRARY:=librmatrix.so

CXXFLAGS:=-g -std=c++17 -Wall -pedantic -Wextra -fPIC

ifneq ($(WINDOWS),1)
	CXX:=g++
	AR:=ar
	RANLIB:=ranlib
	LDFLAGS:=-shared
	LDLIBS:=-lcurl -lrjp -lavformat -lavcodec -lavutil -lswresample -lswscale -lfreeimageplus
	STRIP:=strip
else
	CXX:=x86_64-w64-mingw32-g++
	AR:=x86_64-w64-mingw32-ar
	RANLIB:=x86_64-w64-mingw32-ranlib
	LDFLAGS:=
	LDLIBS:=-lcurl -lrjp -lavformat -lavcodec -lavutil -lswresample -lswscale -lfreeimageplus
	STRIP:=x86_64-w64-mingw32-strip
endif
all: CXXFLAGS+=-O0
release: CXXFLAGS+=-O2

memchk:LDFLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls
memchk:CXXFLAGS+=-O0 -fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls

ifeq ($(OS),Windows_NT)
	mkdir=mkdir $(subst /,\,$(1)) > NUL 2>&1
	rm=del /F $(1) > NUL 2>&1
	rmdir=rd /s /q $(1) > NUL 2>&1
	move=move /y $(subst /,\,$(1)) $(subst /,\,$(2)) > NUL 2>&1
	MAIN_EXECUTABLE:=$(MAIN_EXECUTABLE).exe
	LDLIBS:=-lglfw3 -lSOIL -lgl3w -lm -lopengl32 -lglu32 -lgdi32 -lkernel32
else
	mkdir=mkdir -p $(1)
	rm=rm -f $(1)
	rmdir=rm -rf $(1)
	move=mv $(1) $(2)
endif

INTERNAL_CXXFLAGS=-c $(foreach dir,$(INCLUDE_DIRS),-I"$(dir)") -MMD -MP -MF"$(DEPDIR)/$(notdir $(patsubst %.o,%.d,$@))"
SOURCES:=$(foreach source,$(SOURCE_DIRS),$(foreach ext,$(EXT),$(wildcard $(source)/*.$(ext))))
OBJECTS:=$(addprefix $(OBJDIR)/,$(subst \,.,$(subst /,.,$(addsuffix .o,$(SOURCES)))))

all: $(MAIN_LIBRARY)
.PHONY: memchk
memchk: all
.PHONY: release
release: all
.PHONY: utils
utils: matrix-send
tester: $(MAIN_LIBRARY) $(OBJDIR)/src.test.cpp.o
	$(CXX) -L. -o "$@" $(OBJDIR)/src.test.cpp.o -lrmatrix -lpthread

matrix-send: $(MAIN_LIBRARY) $(OBJDIR)/util.matrix-send.cpp.o
	$(CXX) -L. -o "$@" $(OBJDIR)/util.matrix-send.cpp.o -lrmatrix

$(MAIN_LIBRARY): $(OBJECTS)
	$(CXX) -o "$@" $^ $(CXXFLAGS) $(LDFLAGS) $(LDLIBS)

define GENERATE_OBJECTS

$$(OBJDIR)/$(subst \,.,$(subst /,.,$(1))).%.o: $(1)/%
	$$(CXX) $$(CXXFLAGS) $$(INTERNAL_CXXFLAGS) "$$<" -o "$$@"

endef

$(foreach dir,$(SOURCE_DIRS),$(eval $(call GENERATE_OBJECTS,$(dir))))
$(eval $(call GENERATE_OBJECTS,util))
$(eval $(call GENERATE_OBJECTS,src))
$(OBJECTS): | $(OBJDIR) $(DEPDIR)

$(OBJDIR):
	$(call mkdir,"$@")
$(DEPDIR):
	$(call mkdir,"$@")

.PHONY: clean
clean:
	$(call rmdir,"$(DEPDIR)")
	$(call rmdir,"$(OBJDIR)")
	$(call rm,"$(MAIN_LIBRARY)")
.PHONY: utilsclean
fullclean: clean
	$(call rm,"matrix-send")
	$(call rm,"tester")

-include $(wildcard $(DEPDIR)/*.d)