#!/usr/bin/env bash

# ====================================================================
# Sets the cross compile environment for Android
# Based upon OpenSSL's setenv-android.sh (by TH, JW, and SM).
#
# Crypto++ Library is copyrighted as a compilation and (as of version 5.6.2)
# licensed under the Boost Software License 1.0, while the individual files
# in the compilation are all public domain.
#
# See http://www.cryptopp.com/wiki/Android_(Command_Line) for more details
# ====================================================================

unset IS_CROSS_COMPILE

unset IS_IOS
unset IS_ANDROID
unset IS_ARM_EMBEDDED

unset AOSP_FLAGS
unset AOSP_SYSROOT
unset AOSP_STL_INC
unset AOSP_STL_LIB
unset AOSP_BITS_INC

# Set AOSP_TOOLCHAIN_SUFFIX to your preference of tools and STL library.
#   Note: 4.9 is required for the latest architectures, like ARM64/AARCH64.
# AOSP_TOOLCHAIN_SUFFIX=4.8
# AOSP_TOOLCHAIN_SUFFIX=4.9
if [ -z "$AOSP_TOOLCHAIN_SUFFIX" ]; then
	AOSP_TOOLCHAIN_SUFFIX=4.9
fi

# Set AOSP_API to the API you want to use. 'armeabi' and 'armeabi-v7a' need
#   API 3 (or above), 'mips' and 'x86' need API 9 (or above), etc.
# AOSP_API="android-3"     # Android 1.5 and above
# AOSP_API="android-4"     # Android 1.6 and above
# AOSP_API="android-5"     # Android 2.0 and above
# AOSP_API="android-8"     # Android 2.2 and above
# AOSP_API="android-9"     # Android 2.3 and above
# AOSP_API="android-14"    # Android 4.0 and above
# AOSP_API="android-18"    # Android 4.3 and above
# AOSP_API="android-19"    # Android 4.4 and above
# AOSP_API="android-21"    # Android 5.0 and above
# AOSP_API="android-23"    # Android 6.0 and above
if [ -z "$AOSP_API" ]; then
	AOSP_API="android-21"
fi

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

# ANDROID_NDK_ROOT should always be set by the user (even when not running this script)
#   http://groups.google.com/group/android-ndk/browse_thread/thread/a998e139aca71d77.
# If the user did not specify the NDK location, try and pick it up. We expect something
#   like ANDROID_NDK_ROOT=/opt/android-ndk-r10e or ANDROID_NDK_ROOT=/usr/local/android-ndk-r10e.

if [ -z "$ANDROID_NDK_ROOT" ]; then
	ANDROID_NDK_ROOT=$(find /opt -maxdepth 1 -type d -name android-ndk-r10* 2>/dev/null | tail -1)

	if [ -z "$ANDROID_NDK_ROOT" ]; then
		ANDROID_NDK_ROOT=$(find /usr/local -maxdepth 1 -type d -name android-ndk-r10* 2>/dev/null | tail -1)
	fi
	if [ -z "$ANDROID_NDK_ROOT" ]; then
		ANDROID_NDK_ROOT=$(find $HOME -maxdepth 1 -type d -name android-ndk-r10* 2>/dev/null | tail -1)
	fi
	if [ -d "$HOME/Library/Android/sdk/ndk-bundle" ]; then
		ANDROID_NDK_ROOT="$HOME/Library/Android/sdk/ndk-bundle"
	fi
fi

# Error checking
if [ ! -d "$ANDROID_NDK_ROOT/toolchains" ]; then
	echo "ERROR: ANDROID_NDK_ROOT is not a valid path. Please set it."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

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

if [ "$#" -lt 1 ]; then
	THE_ARCH=armv7
else
	THE_ARCH=$(tr [A-Z] [a-z] <<< "$1")
fi

# https://developer.android.com/ndk/guides/abis.html
case "$THE_ARCH" in
  arm|armv5|armv6|armv7|armeabi)
	TOOLCHAIN_BASE="arm-linux-androideabi"
	TOOLNAME_BASE="arm-linux-androideabi"
	AOSP_ABI="armeabi"
	AOSP_ARCH="arch-arm"
	AOSP_FLAGS="-march=armv5te -mtune=xscale -mthumb -msoft-float -funwind-tables -fexceptions -frtti"
	;;
  armv7a|armeabi-v7a)
	TOOLCHAIN_BASE="arm-linux-androideabi"
	TOOLNAME_BASE="arm-linux-androideabi"
	AOSP_ABI="armeabi-v7a"
	AOSP_ARCH="arch-arm"
	AOSP_FLAGS="-march=armv7-a -mthumb -mfpu=vfpv3-d16 -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti"
	;;
  hard|armv7a-hard|armeabi-v7a-hard)
	TOOLCHAIN_BASE="arm-linux-androideabi"
	TOOLNAME_BASE="arm-linux-androideabi"
	AOSP_ABI="armeabi-v7a"
	AOSP_ARCH="arch-arm"
	AOSP_FLAGS="-mhard-float -D_NDK_MATH_NO_SOFTFP=1 -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti -Wl,--no-warn-mismatch -Wl,-lm_hard"
	;;
  neon|armv7a-neon)
	TOOLCHAIN_BASE="arm-linux-androideabi"
	TOOLNAME_BASE="arm-linux-androideabi"
	AOSP_ABI="armeabi-v7a"
	AOSP_ARCH="arch-arm"
	AOSP_FLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti"
	;;
  armv8|armv8a|aarch64|arm64|arm64-v8a)
	TOOLCHAIN_BASE="aarch64-linux-android"
	TOOLNAME_BASE="aarch64-linux-android"
	AOSP_ABI="arm64-v8a"
	AOSP_ARCH="arch-arm64"
	AOSP_FLAGS="-funwind-tables -fexceptions -frtti"
	;;
  mips|mipsel)
	TOOLCHAIN_BASE="mipsel-linux-android"
	TOOLNAME_BASE="mipsel-linux-android"
	AOSP_ABI="mips"
	AOSP_ARCH="arch-mips"
	AOSP_FLAGS="-funwind-tables -fexceptions -frtti"
	;;
  mips64|mipsel64|mips64el)
	TOOLCHAIN_BASE="mips64el-linux-android"
	TOOLNAME_BASE="mips64el-linux-android"
	AOSP_ABI="mips64"
	AOSP_ARCH="arch-mips64"
	AOSP_FLAGS="-funwind-tables -fexceptions -frtti"
	;;
  x86)
	TOOLCHAIN_BASE="x86"
	TOOLNAME_BASE="i686-linux-android"
	AOSP_ABI="x86"
	AOSP_ARCH="arch-x86"
	AOSP_FLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -funwind-tables -fexceptions -frtti"
	;;
  x86_64|x64)
	TOOLCHAIN_BASE="x86_64"
	TOOLNAME_BASE="x86_64-linux-android"
	AOSP_ABI="x86_64"
	AOSP_ARCH="arch-x86_64"
	AOSP_FLAGS="-march=x86-64 -msse4.2 -mpopcnt -mtune=intel -funwind-tables -fexceptions -frtti"
	;;
  *)
	echo "ERROR: Unknown architecture $1"
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
	;;
esac

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

# GNUmakefile-cross expects these to be set. They are also used in the tests below.
export IS_ANDROID=1
export AOSP_FLAGS

# TODO: for the previous GNUmakefile-cross. These can go away eventually.
export ANDROID_FLAGS=$AOSP_FLAGS

export CPP="$TOOLNAME_BASE-cpp"
export CC="$TOOLNAME_BASE-gcc"
export CXX="$TOOLNAME_BASE-g++"
export LD="$TOOLNAME_BASE-ld"
export AS="$TOOLNAME_BASE-as"
export AR="$TOOLNAME_BASE-ar"
export RANLIB="$TOOLNAME_BASE-ranlib"
export STRIP="$TOOLNAME_BASE-strip"

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

# Based on ANDROID_NDK_ROOT, try and pick up the path for the tools. We expect something
# like /opt/android-ndk-r10e/toolchains/arm-linux-androideabi-4.7/prebuilt/linux-x86_64/bin
# Once we locate the tools, we add it to the PATH.
AOSP_TOOLCHAIN_PATH=""
for host in "linux-x86_64" "darwin-x86_64" "linux-x86" "darwin-x86"
do
	if [ -d "$ANDROID_NDK_ROOT/toolchains/$TOOLCHAIN_BASE-$AOSP_TOOLCHAIN_SUFFIX/prebuilt/$host/bin" ]; then
		AOSP_TOOLCHAIN_PATH="$ANDROID_NDK_ROOT/toolchains/$TOOLCHAIN_BASE-$AOSP_TOOLCHAIN_SUFFIX/prebuilt/$host/bin"
		break
	fi
done

# Error checking
if [ -z "$AOSP_TOOLCHAIN_PATH" ] || [ ! -d "$AOSP_TOOLCHAIN_PATH" ]; then
	echo "ERROR: AOSP_TOOLCHAIN_PATH is not valid. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$CPP" ]; then
	echo "ERROR: Failed to find Android cpp. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$CC" ]; then
	echo "ERROR: Failed to find Android gcc. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

if [ ! -e "$AOSP_TOOLCHAIN_PATH/$CXX" ]; then
	echo "ERROR: Failed to find Android g++. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$RANLIB" ]; then
	echo "ERROR: Failed to find Android ranlib. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$AR" ]; then
	echo "ERROR: Failed to find Android ar. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$AS" ]; then
	echo "ERROR: Failed to find Android as. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_TOOLCHAIN_PATH/$LD" ]; then
	echo "ERROR: Failed to find Android ld. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Only modify/export PATH if AOSP_TOOLCHAIN_PATH good
if [ -d "$AOSP_TOOLCHAIN_PATH" ]; then

	# And only modify PATH if AOSP_TOOLCHAIN_PATH is not present
	LEN=${#AOSP_TOOLCHAIN_PATH}
	SUBSTR=${PATH:0:$LEN}
	if [ "$SUBSTR" != "$AOSP_TOOLCHAIN_PATH" ]; then
		export PATH="$AOSP_TOOLCHAIN_PATH":"$PATH"
	fi
fi

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

# Error checking
if [ ! -d "$ANDROID_NDK_ROOT/platforms/$AOSP_API" ]; then
	echo "ERROR: AOSP_API is not valid. Does the NDK support the API? Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
elif [ ! -d "$ANDROID_NDK_ROOT/platforms/$AOSP_API/$AOSP_ARCH" ]; then
	echo "ERROR: AOSP_ARCH is not valid. Does the NDK support the architecture? Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Android SYSROOT. It will be used on the command line with --sysroot
#   http://android.googlesource.com/platform/ndk/+/ics-mr0/docs/STANDALONE-TOOLCHAIN.html
export AOSP_SYSROOT="$ANDROID_NDK_ROOT/platforms/$AOSP_API/$AOSP_ARCH"

# TODO: export for the previous GNUmakefile-cross. These can go away eventually.
export ANDROID_SYSROOT=$AOSP_SYSROOT

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

# Android STL. We support GNU, LLVM and STLport out of the box.

if [ "$#" -lt 2 ]; then
	THE_STL=stlport-shared
else
	THE_STL=$(tr [A-Z] [a-z] <<< "$2")
fi

case "$THE_STL" in
  stlport-static)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/stlport/stlport/"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/stlport/libs/$AOSP_ABI/libstlport_static.a"
	;;
  stlport|stlport-shared)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/stlport/stlport/"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/stlport/libs/$AOSP_ABI/libstlport_shared.so"
	;;
  gabi++-static|gnu-static)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/include"
	AOSP_BITS_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/libs/$AOSP_ABI/include"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/libs/$AOSP_ABI/libgnustl_static.a"
	;;
  gnu|gabi++|gnu-shared|gabi++-shared)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/include"
	AOSP_BITS_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/libs/$AOSP_ABI/include"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/gnu-libstdc++/$AOSP_TOOLCHAIN_SUFFIX/libs/$AOSP_ABI/libgnustl_shared.so"
	;;
  llvm-static)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/llvm-libc++/libcxx/include"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/llvm-libc++/libs/$AOSP_ABI/libc++_static.a"
	;;
  llvm|llvm-shared)
	AOSP_STL_INC="$ANDROID_NDK_ROOT/sources/cxx-stl/llvm-libc++/libcxx/include"
	AOSP_STL_LIB="$ANDROID_NDK_ROOT/sources/cxx-stl/llvm-libc++/libs/$AOSP_ABI/libc++_shared.so"
	;;
  *)
	echo "ERROR: Unknown STL library $2"
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
esac

# Error checking
if [ ! -d "$AOSP_STL_INC" ] || [ ! -e "$AOSP_STL_INC/memory" ]; then
	echo "ERROR: AOSP_STL_INC is not valid. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

# Error checking
if [ ! -e "$AOSP_STL_LIB" ]; then
	echo "ERROR: AOSP_STL_LIB is not valid. Please edit this script."
	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
fi

export AOSP_STL_INC
export AOSP_STL_LIB

# TODO: for the previous GNUmakefile-cross. These can go away eventually.
export ANDROID_STL_INC=$AOSP_STL_INC
export ANDROID_STL_LIB=$AOSP_STL_LIB

if [ ! -z "$AOSP_BITS_INC" ]; then
	export AOSP_BITS_INC
fi

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

VERBOSE=1
if [ ! -z "$VERBOSE" ] && [ "$VERBOSE" != "0" ]; then
  echo "ANDROID_NDK_ROOT: $ANDROID_NDK_ROOT"
  echo "AOSP_TOOLCHAIN_PATH: $AOSP_TOOLCHAIN_PATH"
  echo "AOSP_ABI: $AOSP_ABI"
  echo "AOSP_API: $AOSP_API"
  echo "AOSP_SYSROOT: $AOSP_SYSROOT"
  echo "AOSP_FLAGS: $AOSP_FLAGS"
  echo "AOSP_STL_INC: $AOSP_STL_INC"
  echo "AOSP_STL_LIB: $AOSP_STL_LIB"
  if [ ! -z "$AOSP_BITS_INC" ]; then
    echo "AOSP_BITS_INC: $AOSP_BITS_INC"
  fi
fi

echo
echo "*******************************************************************************"
echo "It looks the the environment is set correctly. Your next step is"
echo "build the library with 'make -f GNUmakefile-cross'"
echo "*******************************************************************************"
echo

[ "$0" = "$BASH_SOURCE" ] && exit 0 || return 0