#!/bin/sh
#
#  Copyright (c) 2018, The OpenThread Authors.
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#  3. Neither the name of the copyright holder nor the
#     names of its contributors may be used to endorse or promote products
#     derived from this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#  POSSIBILITY OF SUCH DAMAGE.
#

#
# Run this command on parent directory of openthread
#

set -e
set -x

#######################################
# Prepare android build system
# Globals:
#   None
# Arguments:
#   None
# Returns:
#   None
#######################################
android_prepare_build_system()
{
    # Android build system
    (mkdir build && cd build && git init && git pull --depth 1 https://android.googlesource.com/platform/build 2db32730e79cafcf13e1f898a7bee7f82b0449d6)
    ln -s build/core/main.mk Makefile

    # Workarounds for java checking
    export ANDROID_JAVA_HOME=/usr/lib/jvm/java-8-oracle
    mkdir bin
    cat > bin/java <<EOF
#!/bin/sh
echo java version \"1.6\"
EOF

    cat > bin/javac <<EOF
echo javac \"1.6\"
EOF
    chmod a+x bin/java bin/javac
    export PATH=$(pwd)/bin:$PATH

    # Files for building ndk
    mkdir -p system/core/include/arch/linux-arm
    touch system/core/include/arch/linux-arm/AndroidConfig.h

    mkdir -p system/core/include/arch/linux-x86
    touch system/core/include/arch/linux-x86/AndroidConfig.h

    ANDROID_NDK_PATH=$HOME/ndk-bundle
    mkdir -p bionic/libc/
    cp -r $ANDROID_NDK_PATH/sysroot/usr/include bionic/libc/include
    mv bionic/libc/include/arm-linux-androideabi/asm bionic/libc/include/asm

    mkdir -p out/target/product/generic/obj/
    cp -r $ANDROID_NDK_PATH/platforms/android-27/arch-arm/usr/lib out/target/product/generic/obj/

    mkdir -p bionic/libstdc++
    cp -r $ANDROID_NDK_PATH/sources/cxx-stl/gnu-libstdc++/4.9/include bionic/libstdc++
    cp -r $ANDROID_NDK_PATH/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include/* bionic/libstdc++/include
    # The default libstdc++.so does not contain full stl implementation, see https://developer.android.com/ndk/guides/cpp-support
    cp -r $ANDROID_NDK_PATH/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl_shared.so out/target/product/generic/obj/lib/libstdc++.so

    # Build spec
    cat > buildspec.mk <<EOF
TARGET_PRODUCT := generic
TARGET_BUILD_VARIANT := eng
TARGET_BUILD_TYPE := release
TARGET_TOOLS_PREFIX := $ANDROID_NDK_PATH/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
EOF
}

main() {
    android_prepare_build_system

    make showcommands ot-core
    make showcommands ot-cli
    make showcommands ot-ncp
    make showcommands spi-hdlc-adapter

    test -x out/target/product/generic/system/bin/ot-cli
    test -x out/target/product/generic/system/bin/ot-ncp
    test -x out/target/product/generic/system/bin/spi-hdlc-adapter
}

main "$@"