#!/bin/bash

# This file is part of BOINC.
# http://boinc.berkeley.edu
# Copyright (C) 2022 University of California
#
# BOINC is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# BOINC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
#
#
# Script to build Macintosh Universal Intel library (i386 and x86_64)
# of FreeType for use in building BOINC graphics.
# The resulting library is at:
#   [path]/freetype-x.x.x/objs/.libs/libfreetype.a
# where x.x.x is the freetype version number

#
# by Charlie Fenton 7/27/12
# Updated 2/7/14 for OS 10.9
# Updated 4/8/15 to check for spaces in path
# Updated 1/5/16 for FreeType-2.6.2
# Updated 1/25/18 for any version of FreeType (changed only comments)
# Updated 1/23/19 use libc++ instead of libstdc++ for Xcode 10 compatibility
# Updated 8/22/20 to build Apple Silicon / arm64 and x86_64 Universal binary
# Updated 5/18/21 for compatibility with zsh
# Updated 10/18/21 for for building freetype 2.11.0
# Updated 7/13/22 specify to build freetype without brotli support
#
## This script requires OS 10.8 or later
#
## After first installing Xcode, you must have opened Xcode and
## clicked the Install button on the dialog which appears to
## complete the Xcode installation before running this script.
#
## Where x.x.x is the freetype version number:
## In Terminal, CD to the freetype-x.x.x directory.
##     cd [path]/freetype-x.x.x/
## then run this script:
##     source [path]/buildfreetype.sh [ -clean ] [--prefix PATH]
##
## the -clean argument will force a full rebuild.
## if --prefix is given as absolute path the library is installed into there
## use -q or --quiet to redirect build output to /dev/null instead of /dev/stdout
##


SRCDIR=$PWD

echo "${SRCDIR}" | grep " " > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
    echo "**********************************************************"
    echo "**********************************************************"
    echo "**********                                      **********"
    echo "********** ERROR: Path must not contain spaces! **********"
    echo "**********                                      **********"
    echo "**********************************************************"
    echo "**********************************************************"
    echo "**********************************************************"
    return 1
fi

doclean=""
stdout_target="/dev/stdout"
lprefix="`pwd`/../freetype_install/"
libPath="objs/.libs"
while [[ $# -gt 0 ]]; do
    key="$1"
    case $key in
        -clean|--clean)
        doclean="yes"
        ;;
        -prefix|--prefix)
        lprefix="$2"
        libPath="${lprefix}/lib"
        shift
        ;;
        -q|--quiet)
        stdout_target="/dev/null"
        ;;
    esac
    shift # past argument or value
done

GCCPATH=`xcrun -find gcc`
if [ $? -ne 0 ]; then
    echo "ERROR: can't find gcc compiler"
    return 1
fi

GCC_can_build_x86_64="no"
GCC_can_build_arm64="no"
GCC_archs=`lipo -info "${GCCPATH}"`
if [[ "${GCC_archs}" = *"x86_64"* ]]; then GCC_can_build_x86_64="yes"; fi
if [[ "${GCC_archs}" = *"arm64"* ]]; then GCC_can_build_arm64="yes"; fi

if [ "${doclean}" != "yes" ]; then
    if [ -f "${libPath}/libfreetype.a" ]; then
        alreadyBuilt=1

        if [ $GCC_can_build_x86_64 = "yes" ]; then
            lipo "${libPath}/libfreetype.a" -verify_arch x86_64
            if [ $? -ne 0 ]; then alreadyBuilt=0; doclean="yes"; fi
        fi

        if [ $alreadyBuilt -eq 1 ] && [ $GCC_can_build_arm64 = "yes" ]; then
            lipo "${libPath}/libfreetype.a" -verify_arch arm64
            if [ $? -ne 0 ]; then alreadyBuilt=0; doclean="yes"; fi
        fi

        if [ $alreadyBuilt -eq 1 ]; then
            cwd=$(pwd)
            dirname=${cwd##*/}
            echo "${dirname} already built"
            return 0
        fi
    fi
fi

GPPPATH=`xcrun -find g++`
if [ $? -ne 0 ]; then
    echo "ERROR: can't find g++ compiler"
    return 1
fi

MAKEPATH=`xcrun -find make`
if [ $? -ne 0 ]; then
    echo "ERROR: can't find make tool"
    return 1
fi

TOOLSPATH1=${MAKEPATH%/make}

ARPATH=`xcrun -find ar`
if [ $? -ne 0 ]; then
    echo "ERROR: can't find ar tool"
    return 1
fi

TOOLSPATH2=${ARPATH%/ar}

export PATH="${TOOLSPATH1}":"${TOOLSPATH2}":$PATH

SDKPATH=`xcodebuild -version -sdk macosx Path`

# this directory is only used when no --prefix argument was given
rm -fR "../freetype_install/"

# Build for x86_64 architecture

## The "-Werror=unguarded-availability" compiler flag generates an error if
## there is an unguarded API not available in our Deployment Target. This
## helps ensure FreeType won't try to use unavailable APIs on older Mac
## systems supported by BOINC.
## It also causes configure to reject any such APIs for which it tests.
##
export CC="${GCCPATH}";export CXX="${GPPPATH}"
export LDFLAGS="-Wl,-syslibroot,${SDKPATH},-arch,x86_64"
export CPPFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -arch x86_64 -mmacosx-version-min=10.10 -stdlib=libc++ -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
export CXXFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -arch x86_64 -mmacosx-version-min=10.10 -stdlib=libc++ -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
export CFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -arch x86_64 -mmacosx-version-min=10.10 -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
export SDKROOT="${SDKPATH}"
export MACOSX_DEPLOYMENT_TARGET=10.10

./configure --enable-shared=NO --prefix=${lprefix} --enable-freetype-config --without-png --without-brotli --without-harfbuzz --host=x86_64
if [ $? -ne 0 ]; then return 1; fi

if [ "${doclean}" = "yes" ]; then
    make clean
fi

make 1>$stdout_target
if [ $? -ne 0 ]; then return 1; fi

# Now see if we can build for arm64
# Note: Some versions of Xcode 12 don't support building for arm64
if [ $GCC_can_build_arm64 = "yes" ]; then

    export CC="${GCCPATH}";export CXX="${GPPPATH}"
    export LDFLAGS="-Wl,-syslibroot,${SDKPATH},-arch,arm64"
    export CPPFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -target arm64-apple-macos -mmacosx-version-min=10.10 -stdlib=libc++ -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
    export CXXFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -target arm64-apple-macos -mmacosx-version-min=10.10 -stdlib=libc++ -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
    export CFLAGS="-isysroot ${SDKPATH} -Werror=unguarded-availability -mmacosx-version-min=10.10 -target arm64-apple-macos -DMAC_OS_X_VERSION_MAX_ALLOWED=101000 -DMAC_OS_X_VERSION_MIN_REQUIRED=101000"
    export SDKROOT="${SDKPATH}"
    export MACOSX_DEPLOYMENT_TARGET=10.10

    ./configure --enable-shared=NO --prefix=${lprefix} --enable-freetype-config --without-png --without-brotli --without-harfbuzz --host=arm
    if [ $? -ne 0 ]; then
        echo "              ******"
        echo "Freetype: x86_64 build succeeded but could not build for arm64."
        echo "              ******"
    else

        # save x86_64 lib for later use
        mv -f objs/.libs/libfreetype.a objs/.libs/libfreetype_x86_64.a

        # Build for arm64 architecture
        make clean 1>$stdout_target

        make 1>$stdout_target
        if [ $? -ne 0 ]; then
            rm -f objs/.libs/libfreetype_x86_64.a
            return 1
        fi

        mv -f objs/.libs/libfreetype.a objs/.libs/libfreetype_arm64.a
        # combine x86_64 and arm libraries
        lipo -create objs/.libs/libfreetype_x86_64.a objs/.libs/libfreetype_arm64.a -output objs/.libs/libfreetype.a
        if [ $? -ne 0 ]; then
            rm -f objs/.libs/libfreetype_x86_64.a  objs/.libs/libfreetype_arm64.a
            return 1
         fi

        rm -f objs/.libs/libfreetype_x86_64.a
        rm -f objs/.libs/libfreetype_arm64.a
    fi
fi

# Building ftgl requires [install-path]/bin/freetype-config
# this installs the x86_64 library in case we can't build for arm64
make install 1>$stdout_target
if [ $? -ne 0 ]; then return 1; fi

# remove installed items not needed by ftgl build
# this directory is only used when no --prefix argument was given
rm -fR "../freetype_install/share"
rm -f ../freetype_install/lib/libfreetype.*

lprefix=""
export CC="";export CXX=""
export LDFLAGS=""
export CXXFLAGS=""
export CPPFLAGS=""
export CFLAGS=""
export SDKROOT=""

return 0