#!/bin/bash

echo "$(tput setaf 2)"
echo "###################################################################"
echo "# Preparing to build Google Protobuf"
echo "###################################################################"
echo "$(tput sgr0)"

# The version of Protobuf to build.  It must match
# one of the values found in the releases section of the github repo.
# It can be set to "master" when building directly from the github repo.
PROTOBUF_VERSION=2.6.1

# Set to "YES" if you would like the build script to
# pause after each major section.
INTERACTIVE=NO

# A "YES" value will build the latest code from GitHub on the master branch.
# A "NO" value will use the 2.6.1 tarball downloaded from googlecode.com.
USE_GIT_MASTER=NO

while [[ $# > 0 ]]
do
  key="$1"

  case $key in
    -i|--interactive)
      INTERACTIVE=YES
      ;;
    -m|--master)
      USE_GIT_MASTER=YES
      PROTOBUF_VERSION=master
      ;;
    *)
      # unknown option
      ;;
  esac
  shift # past argument or value
done

function conditionalPause {
  if [ "${INTERACTIVE}"  == "YES" ]
  then
    while true; do
        read -p "Proceed with build? (y/n) " yn
        case $yn in
            [Yy]* ) break;;
            [Nn]* ) exit;;
            * ) echo "Please answer yes or no.";;
        esac
    done
  fi
}

# The results will be stored relative to the location
# where you stored this script, **not** relative to
# the location of the protobuf git repo.
PREFIX=`pwd`/protobuf
if [ -d ${PREFIX} ]
then
    rm -rf "${PREFIX}"
fi
mkdir -p "${PREFIX}/platform"

PROTOBUF_GIT_URL=https://github.com/google/protobuf.git
PROTOBUF_GIT_DIRNAME=protobuf
PROTOBUF_RELEASE_URL=https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/protobuf-${PROTOBUF_VERSION}.tar.gz
PROTOBUF_RELEASE_DIRNAME=protobuf-${PROTOBUF_VERSION}

BUILD_MACOSX_X86_64=YES

BUILD_I386_IOSSIM=YES
BUILD_X86_64_IOSSIM=YES

BUILD_IOS_ARMV7=YES
BUILD_IOS_ARMV7S=YES
BUILD_IOS_ARM64=YES

PROTOBUF_SRC_DIR=/tmp/protobuf

# 13.4.0 - Mavericks
# 14.0.0 - Yosemite
# 15.0.0 - El Capitan
DARWIN=darwin`uname -r`

XCODEDIR=`xcode-select --print-path`
IOS_SDK_VERSION=`xcrun --sdk iphoneos --show-sdk-version`
MIN_SDK_VERSION=7.0

MACOSX_PLATFORM=`xcrun --show-sdk-platform-path`
MACOSX_SYSROOT=`xcrun --show-sdk-path`

IPHONEOS_PLATFORM=`xcrun --sdk iphoneos --show-sdk-platform-path`
IPHONEOS_SYSROOT=`xcrun --sdk iphoneos --show-sdk-path`

IPHONESIMULATOR_PLATFORM=`xcrun --sdk iphonesimulator --show-sdk-platform-path`
IPHONESIMULATOR_SYSROOT=`xcrun --sdk iphonesimulator --show-sdk-path`

# Uncomment if you want to see more information about each invocation
# of clang as the builds proceed.
# CLANG_VERBOSE="--verbose"

CC=clang
CXX=clang

SILENCED_WARNINGS="-Wno-unused-local-typedef -Wno-unused-function"

# NOTE: Google Protobuf does not currently build if you specify 'libstdc++'
# instead of `libc++` here.
STDLIB=libc++

CFLAGS_OSX="${CLANG_VERBOSE} ${SILENCED_WARNINGS} -DNDEBUG -g -O0 -pipe -fPIC -fcxx-exceptions"
CFLAGS="${CFLAGS_OSX} -fembed-bitcode"
CXXFLAGS_OSX="${CLANG_VERBOSE} ${CFLAGS_OSX} -std=c++11 -stdlib=${STDLIB}"
CXXFLAGS="${CXXFLAGS_OSX} -fembed-bitcode"

LDFLAGS="-stdlib=${STDLIB}"
LIBS="-lc++ -lc++abi"

echo "PREFIX ..................... ${PREFIX}"
echo "USE_GIT_MASTER ............. ${USE_GIT_MASTER}"
echo "PROTOBUF_GIT_URL ........... ${PROTOBUF_GIT_URL}"
echo "PROTOBUF_GIT_DIRNAME ....... ${PROTOBUF_GIT_DIRNAME}"
echo "PROTOBUF_VERSION ........... ${PROTOBUF_VERSION}"
echo "PROTOBUF_RELEASE_URL ....... ${PROTOBUF_RELEASE_URL}"
echo "PROTOBUF_RELEASE_DIRNAME ... ${PROTOBUF_RELEASE_DIRNAME}"
echo "BUILD_MACOSX_X86_64 ........ ${BUILD_MACOSX_X86_64}"
echo "BUILD_I386_IOSSIM .......... ${BUILD_I386_IOSSIM}"
echo "BUILD_X86_64_IOSSIM ........ ${BUILD_X86_64_IOSSIM}"
echo "BUILD_IOS_ARMV7 ............ ${BUILD_IOS_ARMV7}"
echo "BUILD_IOS_ARMV7S ........... ${BUILD_IOS_ARMV7S}"
echo "BUILD_IOS_ARM64 ............ ${BUILD_IOS_ARM64}"
echo "PROTOBUF_SRC_DIR ........... ${PROTOBUF_SRC_DIR}"
echo "DARWIN ..................... ${DARWIN}"
echo "XCODEDIR ................... ${XCODEDIR}"
echo "IOS_SDK_VERSION ............ ${IOS_SDK_VERSION}"
echo "MIN_SDK_VERSION ............ ${MIN_SDK_VERSION}"
echo "MACOSX_PLATFORM ............ ${MACOSX_PLATFORM}"
echo "MACOSX_SYSROOT ............. ${MACOSX_SYSROOT}"
echo "IPHONEOS_PLATFORM .......... ${IPHONEOS_PLATFORM}"
echo "IPHONEOS_SYSROOT ........... ${IPHONEOS_SYSROOT}"
echo "IPHONESIMULATOR_PLATFORM ... ${IPHONESIMULATOR_PLATFORM}"
echo "IPHONESIMULATOR_SYSROOT .... ${IPHONESIMULATOR_SYSROOT}"
echo "CC ......................... ${CC}"
echo "CFLAGS ..................... ${CFLAGS}"
echo "CXX ........................ ${CXX}"
echo "CXXFLAGS ................... ${CXXFLAGS}"
echo "LDFLAGS .................... ${LDFLAGS}"
echo "LIBS ....................... ${LIBS}"

conditionalPause

echo "$(tput setaf 2)"
echo "###################################################################"
echo "# Fetch Google Protobuf"
echo "###################################################################"
echo "$(tput sgr0)"

(
    if [ -d ${PROTOBUF_SRC_DIR} ]
    then
        rm -rf ${PROTOBUF_SRC_DIR}
    fi

    cd `dirname ${PROTOBUF_SRC_DIR}`

    if [ "${USE_GIT_MASTER}" == "YES" ]
    then
        git clone ${PROTOBUF_GIT_URL}
    else
        if [ -d ${PROTOBUF_RELEASE_DIRNAME} ]
        then
            rm -rf "${PROTOBUF_RELEASE_DIRNAME}"
        fi
        curl --location ${PROTOBUF_RELEASE_URL} --output ${PROTOBUF_RELEASE_DIRNAME}.tar.gz
        tar xvf ${PROTOBUF_RELEASE_DIRNAME}.tar.gz
        mv "${PROTOBUF_RELEASE_DIRNAME}" "${PROTOBUF_SRC_DIR}"
        rm ${PROTOBUF_RELEASE_DIRNAME}.tar.gz

        # Remove the version of Google Test included with the release.
        # We will replace it with version 1.7.0 in a later step.
        if [ -d "${PROTOBUF_SRC_DIR}/gtest" ]
        then
            rm -r "${PROTOBUF_SRC_DIR}/gtest"
        fi
    fi
)

conditionalPause

if [ "${PROTOBUF_VERSION}" == "master" ]
then

  echo "$(tput setaf 2)"
  echo "###################################################################"
  echo "# Run autogen.sh to prepare for build."
  echo "###################################################################"
  echo "$(tput sgr0)"

  (
    cd ${PROTOBUF_SRC_DIR}
    ( exec ./autogen.sh )
  )

else

  echo "$(tput setaf 2)"
  echo "###################################################################"
  echo "# Fetch Google Test & Prepare the Configure Script"
  echo "#   (note: This section is lifted from autogen.sh)"
  echo "###################################################################"
  echo "$(tput sgr0)"

  (
      cd ${PROTOBUF_SRC_DIR}

      # Check that we are being run from the right directory.
      if test ! -f src/google/protobuf/stubs/common.h
      then
          cat >&2 << __EOF__
Could not find source code.  Make sure you are running this script from the
root of the distribution tree.
__EOF__
          exit 1
      fi

      # Check that gtest is present. Older versions of protobuf were stored in SVN
      # and the gtest directory was setup as an SVN external.  Now, protobuf is
      # stored in GitHub and the gtest directory is not included. The commands
      # below will grab the latest version of gtest. Currently that is 1.7.0.
      if test ! -e gtest
      then
          echo "Google Test not present.  Fetching gtest-1.7.0 from the web..."
          curl --location https://github.com/google/googletest/archive/release-1.7.0.tar.gz --output gtest-1.7.0.tar.gz
          tar xvf gtest-1.7.0.tar.gz
          rm gtest-1.7.0.tar.gz
          mv googletest-release-1.7.0 gtest
      fi

      autoreconf -f -i -Wall,no-obsolete
      rm -rf autom4te.cache config.h.in~
  )

fi

conditionalPause

###################################################################
# This section contains the build commands to create the native
# protobuf library for Mac OS X.  This is done first so we have
# a copy of the protoc compiler.  It will be used in all of the
# susequent iOS builds.
###################################################################

echo "$(tput setaf 2)"
echo "###################################################################"
echo "# x86_64 for Mac OS X"
echo "###################################################################"
echo "$(tput sgr0)"

if [ "${BUILD_MACOSX_X86_64}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/x86_64-mac "CC=${CC}" "CFLAGS=${CFLAGS_OSX} -arch x86_64" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS_OSX} -arch x86_64" "LDFLAGS=${LDFLAGS}" "LIBS=${LIBS}"
        make
        make check
        make install
    )
fi

PROTOC=${PREFIX}/platform/x86_64-mac/bin/protoc

conditionalPause

###################################################################
# This section contains the build commands for each of the 
# architectures that will be included in the universal binaries.
###################################################################

echo "$(tput setaf 2)"
echo "###########################"
echo "# i386 for iPhone Simulator"
echo "###########################"
echo "$(tput sgr0)"

if [ "${BUILD_I386_IOSSIM}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --build=x86_64-apple-${DARWIN} --host=i386-apple-${DARWIN} --with-protoc=${PROTOC} --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/i386-sim "CC=${CC}" "CFLAGS=${CFLAGS_OSX} -mios-simulator-version-min=${MIN_SDK_VERSION} -arch i386 -isysroot ${IPHONESIMULATOR_SYSROOT}" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS_OSX} -mios-simulator-version-min=${MIN_SDK_VERSION} -arch i386 -isysroot ${IPHONESIMULATOR_SYSROOT}" LDFLAGS="-arch i386 -mios-simulator-version-min=${MIN_SDK_VERSION} ${LDFLAGS} -L${IPHONESIMULATOR_SYSROOT}/usr/lib/ -L${IPHONESIMULATOR_SYSROOT}/usr/lib/system" "LIBS=${LIBS}"
        make
        make install
    )
fi

conditionalPause

echo "$(tput setaf 2)"
echo "#############################"
echo "# x86_64 for iPhone Simulator"
echo "#############################"
echo "$(tput sgr0)"

if [ "${BUILD_X86_64_IOSSIM}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --build=x86_64-apple-${DARWIN} --host=x86_64-apple-${DARWIN} --with-protoc=${PROTOC} --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/x86_64-sim "CC=${CC}" "CFLAGS=${CFLAGS_OSX} -mios-simulator-version-min=${MIN_SDK_VERSION} -arch x86_64 -isysroot ${IPHONESIMULATOR_SYSROOT}" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS_OSX} -mios-simulator-version-min=${MIN_SDK_VERSION} -arch x86_64 -isysroot ${IPHONESIMULATOR_SYSROOT}" LDFLAGS="-arch x86_64 -mios-simulator-version-min=${MIN_SDK_VERSION} ${LDFLAGS} -L${IPHONESIMULATOR_SYSROOT}/usr/lib/ -L${IPHONESIMULATOR_SYSROOT}/usr/lib/system" "LIBS=${LIBS}"
        make
        make install
    )
fi

conditionalPause

## fix bitcode in arm
## 
## see:
## http://stackoverflow.com/questions/32622284/building-c-static-libraries-using-configure-make-with-fembed-bitcode-fails
export MACOSX_DEPLOYMENT_TARGET="10.4"
##

echo "$(tput setaf 2)"
echo "##################"
echo "# armv7 for iPhone"
echo "##################"
echo "$(tput sgr0)"

if [ "${BUILD_IOS_ARMV7}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --build=x86_64-apple-${DARWIN} --host=armv7-apple-${DARWIN} --with-protoc=${PROTOC} --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/armv7-ios "CC=${CC}" "CFLAGS=${CFLAGS} -miphoneos-version-min=${MIN_SDK_VERSION} -arch armv7 -isysroot ${IPHONEOS_SYSROOT}" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS} -arch armv7 -isysroot ${IPHONEOS_SYSROOT}" LDFLAGS="-arch armv7 -miphoneos-version-min=${MIN_SDK_VERSION} ${LDFLAGS}" "LIBS=${LIBS}"
        make
        make install
    )
fi

conditionalPause

echo "$(tput setaf 2)"
echo "###################"
echo "# armv7s for iPhone"
echo "###################"
echo "$(tput sgr0)"

if [ "${BUILD_IOS_ARMV7S}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --build=x86_64-apple-${DARWIN} --host=armv7s-apple-${DARWIN} --with-protoc=${PROTOC} --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/armv7s-ios "CC=${CC}" "CFLAGS=${CFLAGS} -miphoneos-version-min=${MIN_SDK_VERSION} -arch armv7s -isysroot ${IPHONEOS_SYSROOT}" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS} -miphoneos-version-min=${MIN_SDK_VERSION} -arch armv7s -isysroot ${IPHONEOS_SYSROOT}" LDFLAGS="-arch armv7s -miphoneos-version-min=${MIN_SDK_VERSION} ${LDFLAGS}" "LIBS=${LIBS}"
        make
        make install
    )
fi

conditionalPause

echo "$(tput setaf 2)"
echo "##################"
echo "# arm64 for iPhone"
echo "##################"
echo "$(tput sgr0)"

if [ "${BUILD_IOS_ARM64}" == "YES" ]
then
    (
        cd ${PROTOBUF_SRC_DIR}
        make clean
        ./configure --build=x86_64-apple-${DARWIN} --host=arm --with-protoc=${PROTOC} --disable-shared --prefix=${PREFIX} --exec-prefix=${PREFIX}/platform/arm64-ios "CC=${CC}" "CFLAGS=${CFLAGS} -miphoneos-version-min=${MIN_SDK_VERSION} -arch arm64 -isysroot ${IPHONEOS_SYSROOT}" "CXX=${CXX}" "CXXFLAGS=${CXXFLAGS} -miphoneos-version-min=${MIN_SDK_VERSION} -arch arm64 -isysroot ${IPHONEOS_SYSROOT}" LDFLAGS="-arch arm64 -miphoneos-version-min=${MIN_SDK_VERSION} ${LDFLAGS}" "LIBS=${LIBS}"
        make
        make install
    )
fi

conditionalPause

echo "$(tput setaf 2)"
echo "###################################################################"
echo "# Create Universal Libraries and Finalize the packaging"
echo "###################################################################"
echo "$(tput sgr0)"

(
    cd ${PREFIX}/platform
    mkdir universal
    lipo x86_64-sim/lib/libprotobuf.a i386-sim/lib/libprotobuf.a arm64-ios/lib/libprotobuf.a armv7s-ios/lib/libprotobuf.a armv7-ios/lib/libprotobuf.a -create -output universal/libprotobuf.a
    lipo x86_64-sim/lib/libprotobuf-lite.a i386-sim/lib/libprotobuf-lite.a arm64-ios/lib/libprotobuf-lite.a armv7s-ios/lib/libprotobuf-lite.a armv7-ios/lib/libprotobuf-lite.a -create -output universal/libprotobuf-lite.a
)

(
    cd ${PREFIX}
    mkdir bin
    mkdir lib
    cp -r platform/x86_64-mac/bin/protoc bin
    cp -r platform/x86_64-mac/lib/* lib
    cp -r platform/universal/* lib
    rm -rf platform
    lipo -info lib/libprotobuf.a
    lipo -info lib/libprotobuf-lite.a
)

if [ "${USE_GIT_MASTER}" == "YES" ]
then
    if [ -d "${PREFIX}-master" ]
    then
        rm -rf "${PREFIX}-master"
    fi
    mv "${PREFIX}" "${PREFIX}-master"
else
    if [ -d "${PREFIX}-${PROTOBUF_VERSION}" ]
    then
        rm -rf "${PREFIX}-${PROTOBUF_VERSION}"
    fi
    mv "${PREFIX}" "${PREFIX}-${PROTOBUF_VERSION}"
fi

echo Done!