#!/bin/bash
#
# Copyright 2020 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.

set -eu -o pipefail

WORKDIR="/tmp/grpc-go-tools"
mkdir -p "${WORKDIR}"

"$(dirname "${0}")"/install-protoc.sh ${WORKDIR}

export GOBIN="${WORKDIR}"/bin
export PATH="${GOBIN}:${PATH}"
mkdir -p "${GOBIN}"

echo "removing existing generated files..."
# grpc_testing_not_regenerated/*.pb.go is not re-generated,
# see grpc_testing_not_regenerated/README.md for details.
find . -name '*.pb.go' | grep -v 'grpc_testing_not_regenerated' | xargs rm -f || true

echo "Executing: go install google.golang.org/protobuf/cmd/protoc-gen-go..."
(cd test/tools && go install google.golang.org/protobuf/cmd/protoc-gen-go)

echo "Executing: go install cmd/protoc-gen-go-grpc..."
(cd cmd/protoc-gen-go-grpc && go install .)

echo "Pulling protos from https://github.com/grpc/grpc-proto..."
if [ -d "${WORKDIR}/grpc-proto" ]; then
  (cd "${WORKDIR}/grpc-proto" && git pull)
else
  git clone --quiet https://github.com/grpc/grpc-proto "${WORKDIR}/grpc-proto"
fi

echo "Pulling protos from https://github.com/protocolbuffers/protobuf..."
if [ -d "${WORKDIR}/protobuf" ]; then
  (cd "${WORKDIR}/protobuf" && git pull)
else
  git clone --quiet https://github.com/protocolbuffers/protobuf "${WORKDIR}/protobuf"
fi

# Pull in code.proto as a proto dependency
mkdir -p "${WORKDIR}/googleapis/google/rpc"
echo "Pulling code.proto from https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto..."
curl --silent https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto > "${WORKDIR}/googleapis/google/rpc/code.proto"


mkdir -p "${WORKDIR}/out"

# Generates sources without the embed requirement
LEGACY_SOURCES=(
  "${WORKDIR}/grpc-proto/grpc/binlog/v1/binarylog.proto"
  "${WORKDIR}/grpc-proto/grpc/channelz/v1/channelz.proto"
  "${WORKDIR}/grpc-proto/grpc/health/v1/health.proto"
  "${WORKDIR}/grpc-proto/grpc/lb/v1/load_balancer.proto"
  profiling/proto/service.proto
  "${WORKDIR}/grpc-proto/grpc/reflection/v1alpha/reflection.proto"
  "${WORKDIR}/grpc-proto/grpc/reflection/v1/reflection.proto"
)

# Generates only the new gRPC Service symbols
SOURCES=(
  $(git ls-files --exclude-standard --cached --others "*.proto" | grep -v '^profiling/proto/service.proto$')
  "${WORKDIR}/grpc-proto/grpc/gcp/altscontext.proto"
  "${WORKDIR}/grpc-proto/grpc/gcp/handshaker.proto"
  "${WORKDIR}/grpc-proto/grpc/gcp/transport_security_common.proto"
  "${WORKDIR}/grpc-proto/grpc/lookup/v1/rls.proto"
  "${WORKDIR}/grpc-proto/grpc/lookup/v1/rls_config.proto"
  "${WORKDIR}"/grpc-proto/grpc/testing/*.proto
  "${WORKDIR}"/grpc-proto/grpc/core/*.proto
)

# These options of the form 'Mfoo.proto=bar' instruct the codegen to use an
# import path of 'bar' in the generated code when 'foo.proto' is imported in
# one of the sources.
#
# Note that the protos listed here are all for testing purposes. All protos to
# be used externally should have a go_package option (and they don't need to be
# listed here).
OPTS=Mgrpc/core/stats.proto=google.golang.org/grpc/interop/grpc_testing/core,\
Mgrpc/testing/benchmark_service.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/stats.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/report_qps_scenario_service.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/messages.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/worker_service.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/control.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/test.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/payloads.proto=google.golang.org/grpc/interop/grpc_testing,\
Mgrpc/testing/empty.proto=google.golang.org/grpc/interop/grpc_testing

for src in "${SOURCES[@]}"; do
  echo "protoc ${src}"
  protoc --go_out="${OPTS}:${WORKDIR}/out" --go-grpc_out="${OPTS}:${WORKDIR}/out" \
    -I"." \
    -I"${WORKDIR}/grpc-proto" \
    -I"${WORKDIR}/googleapis" \
    -I"${WORKDIR}/protobuf/src" \
    "${src}"
done

for src in "${LEGACY_SOURCES[@]}"; do
  echo "protoc ${src}"
  protoc --go_out="${OPTS}:${WORKDIR}/out" --go-grpc_out="${OPTS},require_unimplemented_servers=false:${WORKDIR}/out" \
    -I"." \
    -I"${WORKDIR}/grpc-proto" \
    -I"${WORKDIR}/googleapis" \
    -I"${WORKDIR}/protobuf/src" \
    "${src}"
done

# The go_package option in grpc/lookup/v1/rls.proto doesn't match the
# current location. Move it into the right place.
mkdir -p "${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1"
mv "${WORKDIR}"/out/google.golang.org/grpc/lookup/grpc_lookup_v1/* "${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1"

# grpc_testing_not_regenerated/*.pb.go are not re-generated,
# see grpc_testing_not_regenerated/README.md for details.
rm "${WORKDIR}"/out/google.golang.org/grpc/testdata/grpc_testing_not_regenerated/*.pb.go

cp -R "${WORKDIR}"/out/google.golang.org/grpc/* .