#
# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# TODO(jtattermusch): Remove the hack to workaround protobuf bug. See https://github.com/protocolbuffers/protobuf/issues/12439
# Hack: protobuf currently doesn't declare it's absl dependencies when protobuf.pc pkgconfig file is used.
PROTOBUF_ABSL_DEPS = absl_absl_check absl_absl_log absl_algorithm absl_base absl_bind_front absl_bits absl_btree absl_cleanup absl_cord absl_core_headers absl_debugging absl_die_if_null absl_dynamic_annotations absl_flags absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_layout absl_log_initialize absl_log_severity absl_memory absl_node_hash_map absl_node_hash_set absl_optional absl_span absl_status absl_statusor absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant
# TODO(jtattermusch): Remove the hack to workaround protobuf/utf8_range bug. See https://github.com/protocolbuffers/utf8_range/issues/20
# Hack: utf8_range (which is protobuf's dependency) currently doesn't have a pkgconfig file, so we need to explicitly
# tweak the list of libraries to link against to fix the build.
PROTOBUF_UTF8_RANGE_LINK_LIBS = -lutf8_validity
OPENTELEMETRY_LINK_LIBS = -lopentelemetry_metrics -lopentelemetry_exporter_ostream_metrics -lopentelemetry_resources -lopentelemetry_common

HOST_SYSTEM = $(shell uname | cut -f 1 -d_)
SYSTEM ?= $(HOST_SYSTEM)
CXX = g++
CPPFLAGS += `pkg-config --cflags protobuf grpc absl_flags absl_flags_parse`
ifeq ($(SYSTEM),Darwin)
LDFLAGS += -L/usr/local/lib `pkg-config --libs --static protobuf grpc++ grpcpp_otel_plugin absl_flags absl_flags_parse $(PROTOBUF_ABSL_DEPS)` \
           $(PROTOBUF_UTF8_RANGE_LINK_LIBS) \
	       $(OPENTELEMETRY_LINK_LIBS) \
           -pthread \
           -lgrpc++_reflection \
           -ldl
else
LDFLAGS += -L/usr/local/lib `pkg-config --libs --static protobuf grpc++ grpcpp_otel_plugin absl_flags absl_flags_parse $(PROTOBUF_ABSL_DEPS)` \
           $(PROTOBUF_UTF8_RANGE_LINK_LIBS) \
	       $(OPENTELEMETRY_LINK_LIBS) \
           -pthread \
           -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed \
           -ldl
endif
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_callback_client greeter_callback_server

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

greeter_callback_server: util.o helloworld.pb.o helloworld.grpc.pb.o greeter_callback_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=. $<

util.o: ../util.cc
	$(CXX) $^ -I . -I $(CPPFLAGS) -c -o $@

clean:
	rm -f *.o *.pb.cc *.pb.h greeter_callback_client greeter_callback_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\|libprotoc [0-9][0-9]\.'
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 ($(HAS_VALID_PROTOC),true)
	@echo " DEPENDENCY ERROR"
	@echo
	@echo "You don't have protoc 3.0.0 or newer installed in your path."
	@echo "Please install an up-to-date version of Google protocol buffers."
	@echo "You can find it here:"
	@echo
	@echo "   https://github.com/protocolbuffers/protobuf/releases"
	@echo
	@echo "Here is what I get when trying to evaluate your version of protoc:"
	@echo
	-$(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