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# Copyright 2015-2016, Google Inc.
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#
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# notice, this list of conditions and the following disclaimer.
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# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
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# this software without specific prior written permission.
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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CXX = g++
CPPFLAGS += -I/usr/local/include -pthread
CXXFLAGS += -std=c++11
LDFLAGS += -L/usr/local/lib -lgrpc++_unsecure -lgrpc -lprotobuf -lpthread -ldl
PROTOC = protoc
GRPC_CPP_PLUGIN = grpc_cpp_plugin
GRPC_CPP_PLUGIN_PATH ?= `which $(GRPC_CPP_PLUGIN)`

PROTOS_PATH = ../../protos

vpath %.proto $(PROTOS_PATH)

all: system-check greeter_client greeter_server greeter_async_client greeter_async_server

greeter_client: helloworld.pb.o helloworld.grpc.pb.o greeter_client.o
	$(CXX) $^ $(LDFLAGS) -o $@

greeter_server: helloworld.pb.o helloworld.grpc.pb.o greeter_server.o
	$(CXX) $^ $(LDFLAGS) -o $@

greeter_async_client: helloworld.pb.o helloworld.grpc.pb.o greeter_async_client.o
	$(CXX) $^ $(LDFLAGS) -o $@

greeter_async_server: helloworld.pb.o helloworld.grpc.pb.o greeter_async_server.o
	$(CXX) $^ $(LDFLAGS) -o $@

.PRECIOUS: %.grpc.pb.cc
%.grpc.pb.cc: %.proto
	$(PROTOC) -I $(PROTOS_PATH) --grpc_out=. --plugin=protoc-gen-grpc=$(GRPC_CPP_PLUGIN_PATH) $<

.PRECIOUS: %.pb.cc
%.pb.cc: %.proto
	$(PROTOC) -I $(PROTOS_PATH) --cpp_out=. $<

clean:
	rm -f *.o *.pb.cc *.pb.h greeter_client greeter_server greeter_async_client greeter_async_server


# The following is to test your system and ensure a smoother experience.
# They are by no means necessary to actually compile a grpc-enabled software.

PROTOC_CMD = which $(PROTOC)
PROTOC_CHECK_CMD = $(PROTOC) --version | grep -q libprotoc.3
PLUGIN_CHECK_CMD = which $(GRPC_CPP_PLUGIN)
HAS_PROTOC = $(shell $(PROTOC_CMD) > /dev/null && echo true || echo false)
ifeq ($(HAS_PROTOC),true)
HAS_VALID_PROTOC = $(shell $(PROTOC_CHECK_CMD) 2> /dev/null && echo true || echo false)
endif
HAS_PLUGIN = $(shell $(PLUGIN_CHECK_CMD) > /dev/null && echo true || echo false)

SYSTEM_OK = false
ifeq ($(HAS_VALID_PROTOC),true)
ifeq ($(HAS_PLUGIN),true)
SYSTEM_OK = true
endif
endif

system-check:
ifneq ($(HAS_VALID_PROTOC),true)
	@echo " DEPENDENCY ERROR"
	@echo
	@echo "You don't have protoc 3.0.0 installed in your path."
	@echo "Please install Google protocol buffers 3.0.0 and its compiler."
	@echo "You can find it here:"
	@echo
	@echo "   https://github.com/google/protobuf/releases/tag/v3.0.0-beta-2"
	@echo
	@echo "Here is what I get when trying to evaluate your version of protoc:"
	@echo
	-$(PROTOC) --version
	@echo
	@echo
endif
ifneq ($(HAS_PLUGIN),true)
	@echo " DEPENDENCY ERROR"
	@echo
	@echo "You don't have the grpc c++ protobuf plugin installed in your path."
	@echo "Please install grpc. You can find it here:"
	@echo
	@echo "   https://github.com/grpc/grpc"
	@echo
	@echo "Here is what I get when trying to detect if you have the plugin:"
	@echo
	-which $(GRPC_CPP_PLUGIN)
	@echo
	@echo
endif
ifneq ($(SYSTEM_OK),true)
	@false
endif
