#!/bin/bash
#  Builds libopus for all three current iPhone targets: iPhoneSimulator-i386,
#  iPhoneOS-armv6, iPhoneOS-armv7.
#
#  Copyright 2012 Mike Tigas <mike@tig.as>
#
#  Based on work by Felix Schulze on 16.12.10.
#  Copyright 2010 Felix Schulze. All rights reserved.
#
#  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.
#
###########################################################################
#  Choose your libopus version and your currently-installed iOS SDK version:
#
VERSION=${OPUS_VERSION:-"1.3.1"}
SDKVERSION="12.2"
MINIOSVERSION=${IOS_MIN_SDK_VERSION:-"8.0"}

###########################################################################
#
# Don't change anything under this line!
#
###########################################################################

# by default, we won't build for debugging purposes
if [ "${DEBUG}" == "true" ]; then
    echo "Compiling for debugging ..."
    OPT_CFLAGS="-O0 -fno-inline -g"
    OPT_LDFLAGS=""
    OPT_CONFIG_ARGS="--enable-assertions --disable-asm"
else
    OPT_CFLAGS="-Ofast -flto -g"
    OPT_LDFLAGS="-flto"
    OPT_CONFIG_ARGS=""
fi


# No need to change this since xcode build will only compile in the
# necessary bits from the libraries we create
ARCHS="armv7 armv7s arm64 i386 x86_64"

DEVELOPER=`xcode-select -print-path`
#DEVELOPER="/Applications/Xcode.app/Contents/Developer"

# cd "`dirname \"$0\"`"
# REPOROOT=$(pwd)
REPOROOT=$(python -c "import os,sys; print os.path.realpath(sys.argv[1])" "$1")

# Where we'll end up storing things in the end
OUTPUTDIR="${REPOROOT}/dependencies"
mkdir -p "${OUTPUTDIR}/include"
mkdir -p "${OUTPUTDIR}/lib"


BUILDDIR="${REPOROOT}/build"

# where we will keep our sources and build from.
SRCDIR="${BUILDDIR}/src"
mkdir -p $SRCDIR
# where we will store intermediary builds
INTERDIR="${BUILDDIR}/built"
mkdir -p $INTERDIR

########################################

cd $SRCDIR

# Exit the script if an error happens
set -e

if [ ! -e "${SRCDIR}/opus-${VERSION}.tar.gz" ]; then
    echo "Downloading opus-${VERSION}.tar.gz"
    curl -LO http://downloads.xiph.org/releases/opus/opus-${VERSION}.tar.gz
fi
echo "Using opus-${VERSION}.tar.gz"

tar zxf opus-${VERSION}.tar.gz
cd "${SRCDIR}/opus-${VERSION}"

set +e # don't bail out of bash script if ccache doesn't exist
CCACHE=`which ccache`
if [ $? == "0" ]; then
    echo "Building with ccache: $CCACHE"
    CCACHE="${CCACHE} "
else
    echo "Building without ccache"
    CCACHE=""
fi
set -e # back to regular "bail out on error" mode

export ORIGINALPATH=$PATH

for ARCH in ${ARCHS}
do
    echo "** Compiling ${ARCH}"
    if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ]; then
        PLATFORM="iPhoneSimulator"
        EXTRA_FLAGS="--with-pic"
        EXTRA_CFLAGS="-arch ${ARCH}"
        EXTRA_CONFIG="--host=${ARCH}-apple-darwin"
    else
        PLATFORM="iPhoneOS"
        EXTRA_CFLAGS="-arch ${ARCH}"
        EXTRA_CONFIG="--host=arm-apple-darwin"
    fi
    
    mkdir -p "${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk"
    
    ./configure \
    --enable-float-approx --disable-shared --enable-static \
    --with-pic --disable-extra-programs --disable-doc ${EXTRA_CONFIG} \
    --prefix="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk" \
    $EXTRA_CONFIG \
    LDFLAGS="$LDFLAGS ${OPT_LDFLAGS} -fPIE -miphoneos-version-min=${MINIOSVERSION} -L${OUTPUTDIR}/lib" \
    CFLAGS="$CFLAGS ${EXTRA_CFLAGS} ${OPT_CFLAGS} -fPIE -miphoneos-version-min=${MINIOSVERSION} -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk" \
    
    # Build the application and install it to the fake SDK intermediary dir
    # we have set up. Make sure to clean up afterward because we will re-use
    # this source tree to cross-compile other targets.
    make -j8
    make install
    make clean
done

########################################

echo "Build library..."

# These are the libs that comprise libopus.
OUTPUT_LIBS="libopus.a"
for OUTPUT_LIB in ${OUTPUT_LIBS}; do
    INPUT_LIBS=""
    for ARCH in ${ARCHS}; do
        if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
        then
            PLATFORM="iPhoneSimulator"
        else
            PLATFORM="iPhoneOS"
        fi
        INPUT_ARCH_LIB="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/lib/${OUTPUT_LIB}"
        if [ -e $INPUT_ARCH_LIB ]; then
            INPUT_LIBS="${INPUT_LIBS} ${INPUT_ARCH_LIB}"
        fi
    done
    # Combine the three architectures into a universal library.
    if [ -n "$INPUT_LIBS"  ]; then
        echo "** lipo libs"
        lipo -create $INPUT_LIBS \
        -output "${OUTPUTDIR}/lib/${OUTPUT_LIB}"
    else
        echo "$OUTPUT_LIB does not exist, skipping (are the dependencies installed?)"
    fi
done

for ARCH in ${ARCHS}; do
    if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
    then
        PLATFORM="iPhoneSimulator"
    else
        PLATFORM="iPhoneOS"
    fi
    cp -R ${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/include/* ${OUTPUTDIR}/include/
    if [ $? == "0" ]; then
        # We only need to copy the headers over once. (So break out of forloop
        # once we get first success.)
        break
    fi
done


####################

echo "Building done."
echo "Cleaning up..."
rm -fr ${INTERDIR}
rm -fr "${SRCDIR}/opus-${VERSION}"
echo "Done."