#!/bin/bash

# In order to cross-compile node for Android using NDK, run:
#   source android-configure <path_to_ndk> [arch]
#
# By running android-configure with source, will allow environment variables to
# be persistent in current session. This is useful for installing native node
# modules with npm. Also, don't forget to set the arch in npm config using
# 'npm config set arch=<arch>'

if [ $# -ne 3 ]; then
  echo "$0 should have 3 parameters: ndk_path, target_arch and sdk_version"
  return 1
fi

NDK_PATH=$1
ARCH="$2"
ANDROID_SDK_VERSION=$3

if [ $ANDROID_SDK_VERSION -lt 23 ]; then
  echo "$ANDROID_SDK_VERSION should equal or later than 23(Android 6.0)"
fi

CC_VER="4.9"

case $ARCH in
    arm)
        DEST_CPU="arm"
        TOOLCHAIN_NAME="armv7-linux-androideabi"
        ;;
    x86)
        DEST_CPU="ia32"
        TOOLCHAIN_NAME="i686-linux-android"
        ;;
    x86_64)
        DEST_CPU="x64"
        TOOLCHAIN_NAME="x86_64-linux-android"
        ARCH="x64"
        ;;
    arm64|aarch64)
        DEST_CPU="arm64"
        TOOLCHAIN_NAME="aarch64-linux-android"
        ARCH="arm64"
        ;;
    *)
        echo "Unsupported architecture provided: $ARCH"
        return 1
        ;;
esac

HOST_OS="linux"
HOST_ARCH="x86_64"
export CC_host=$(command -v gcc)
export CXX_host=$(command -v g++)

host_gcc_version=$($CC_host --version | grep gcc | awk '{print $NF}')
major=$(echo $host_gcc_version | awk -F . '{print $1}')
minor=$(echo $host_gcc_version | awk -F . '{print $2}')
if [ -z $major ] || [ -z $minor ] || [ $major -lt 6 ] || ( [ $major -eq 6 ] && [ $minor -lt 3 ] ); then
  echo "host gcc $host_gcc_version is too old, need gcc 6.3.0"
  return 1
fi

SUFFIX="$TOOLCHAIN_NAME$ANDROID_SDK_VERSION"
TOOLCHAIN=$NDK_PATH/toolchains/llvm/prebuilt/$HOST_OS-$HOST_ARCH

export PATH=$TOOLCHAIN/bin:$PATH
export CC=$TOOLCHAIN/bin/$SUFFIX-clang
export CXX=$TOOLCHAIN/bin/$SUFFIX-clang++


GYP_DEFINES="target_arch=$ARCH"
GYP_DEFINES+=" v8_target_arch=$ARCH"
GYP_DEFINES+=" android_target_arch=$ARCH"
GYP_DEFINES+=" host_os=$HOST_OS OS=android"
export GYP_DEFINES

if [ -f "configure" ]; then
    ./configure \
        --dest-cpu=$DEST_CPU \
        --dest-os=android \
        --without-snapshot \
        --openssl-no-asm \
        --cross-compiling
fi