#!/usr/bin/env bash

# Run this script to regenerate descriptor.pb.{h,cc} after the protocol
# compiler changes.  Since these files are compiled into the protocol compiler
# itself, they cannot be generated automatically by a make rule.  "make check"
# will fail if these files do not match what the protocol compiler would
# generate.
#
# HINT:  Flags passed to generate_descriptor_proto.sh will be passed directly
#   to make when building protoc.  This is particularly useful for passing
#   -j4 to run 4 jobs simultaneously.

if test ! -e src/google/protobuf/stubs/common.h {
  cat >&2 <<< """
Could not find source code.  Make sure you are running this script from the
root of the distribution tree.
"""
  exit 1
}

if test ! -e src/Makefile {
  cat >&2 <<< """
Could not find src/Makefile.  You must run ./configure (and perhaps
./autogen.sh) first.
"""
  exit 1
}

cd src

declare -a RUNTIME_PROTO_FILES=(\
  google/protobuf/any.proto \
  google/protobuf/api.proto \
  google/protobuf/descriptor.proto \
  google/protobuf/duration.proto \
  google/protobuf/empty.proto \
  google/protobuf/field_mask.proto \
  google/protobuf/source_context.proto \
  google/protobuf/struct.proto \
  google/protobuf/timestamp.proto \
  google/protobuf/type.proto \
  google/protobuf/wrappers.proto)

setvar CORE_PROTO_IS_CORRECT = '0'
setvar PROCESS_ROUND = '1'
setvar TMP = $(mktemp -d)
echo "Updating descriptor protos..."
while [ $CORE_PROTO_IS_CORRECT -ne 1 ]
{
  echo "Round $PROCESS_ROUND"
  setvar CORE_PROTO_IS_CORRECT = '1'

  make $[join(ARGV)] protoc
  if test $? -ne 0 {
    echo "Failed to build protoc."
    exit 1
  }

  ./protoc --cpp_out=dllexport_decl=LIBPROTOBUF_EXPORT:$TMP ${RUNTIME_PROTO_FILES[@]} && \
  ./protoc --cpp_out=dllexport_decl=LIBPROTOC_EXPORT:$TMP google/protobuf/compiler/plugin.proto

  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]} {
    setvar BASE_NAME = ${PROTO_FILE%.*}
    diff ${BASE_NAME}.pb.h $TMP/${BASE_NAME}.pb.h > /dev/null
    if test $? -ne 0 {
      setvar CORE_PROTO_IS_CORRECT = '0'
    }
    diff ${BASE_NAME}.pb.cc $TMP/${BASE_NAME}.pb.cc > /dev/null
    if test $? -ne 0 {
      setvar CORE_PROTO_IS_CORRECT = '0'
    }
  }

  diff google/protobuf/compiler/plugin.pb.h $TMP/google/protobuf/compiler/plugin.pb.h > /dev/null
  if test $? -ne 0 {
    setvar CORE_PROTO_IS_CORRECT = '0'
  }
  diff google/protobuf/compiler/plugin.pb.cc $TMP/google/protobuf/compiler/plugin.pb.cc > /dev/null
  if test $? -ne 0 {
    setvar CORE_PROTO_IS_CORRECT = '0'
  }

  # Only override the output if the files are different to avoid re-compilation
  # of the protoc.
  if test $CORE_PROTO_IS_CORRECT -ne 1 {
    for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]} {
      setvar BASE_NAME = ${PROTO_FILE%.*}
      mv $TMP/${BASE_NAME}.pb.h ${BASE_NAME}.pb.h
      mv $TMP/${BASE_NAME}.pb.cc ${BASE_NAME}.pb.cc
    }
    mv $TMP/google/protobuf/compiler/plugin.pb.* google/protobuf/compiler/
  }

  setvar PROCESS_ROUND = $((PROCESS_ROUND + 1))
}
cd ..

if test -x objectivec/generate_well_known_types.sh {
  echo "Generating messages for objc."
  objectivec/generate_well_known_types.sh $[join(ARGV)]
}

if test -x csharp/generate_protos.sh {
  echo "Generating messages for C#."
  csharp/generate_protos.sh $[join(ARGV)]
}