#!/bin/bash
#
#  This file is part of nzbget. See <http://nzbget.net>.
#
#  Copyright (C) 2018 Andrey Prygunkov <hugbug@users.sourceforge.net>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program 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 General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# This script builds cross-compiling toolchain, which can compile NZBGet for Android.
# The toolchain itself runs on Linux.

# Setup strict bash error handling
set -o nounset
set -o errexit

# Uncomment next line for debuging
#set -x


# Android API level
APILEVEL=21

# Architecture
ARCH=$1
case "$ARCH" in
    i686)
        NDK_ARCH="x86"
        NDK_TARGET="i686-linux-android"
        OPENSSL_TARGET="android-x86"
        ;;
    x86_64)
        NDK_ARCH="x86_64"
        NDK_TARGET="x86_64-linux-android"
        OPENSSL_TARGET="android64"
        ;;
    armhf)
        NDK_ARCH="arm"
        NDK_TARGET="arm-linux-androideabi"
        OPENSSL_TARGET="android-armeabi"
        ;;
    aarch64)
        NDK_ARCH="arm64"
        NDK_TARGET="aarch64-linux-android"
        OPENSSL_TARGET="android64-aarch64"
        ;;
    *)
        echo "Usage: $0 (i686|x86_64|armhf|aarch64)"
        exit 1
        ;;
esac

echo "Creating toolchain for $ARCH"

# Android NDK
NDK_VERSION="r17"
NDK_DIRNAME="android-ndk-$NDK_VERSION"
NDK_ARCHIVE="$NDK_DIRNAME-linux-x86_64.zip"
NDK_URL="https://dl.google.com/android/repository/$NDK_ARCHIVE"

# Libxml
LIBXML2_VERSION="2.9.4"
LIBXML2_ARCHIVE="libxml2-$LIBXML2_VERSION.tar.gz"
LIBXML2_URL="http://xmlsoft.org/sources/$LIBXML2_ARCHIVE"

# OpenSSL
OPENSSL_VERSION="1.1.0h"
OPENSSL_ARCHIVE="openssl-$OPENSSL_VERSION.tar.gz"
OPENSSL_URL="https://www.openssl.org/source/$OPENSSL_ARCHIVE"

# NCurses
NCURSES_VERSION="6.0"
NCURSES_ARCHIVE="ncurses-$NCURSES_VERSION.tar.gz"
NCURSES_URL="https://ftp.gnu.org/pub/gnu/ncurses/$NCURSES_ARCHIVE"

### START OF THE SCRIPT

ROOTDIR=`pwd`
ROOTDIR="$ROOTDIR/$ARCH-ndk"

rm -rf $ROOTDIR
mkdir $ROOTDIR
cd $ROOTDIR

# Download all required tools and libraries
cd ..
mkdir -p downloads
cd downloads
if [ ! -d $NDK_DIRNAME -a ! -f $NDK_ARCHIVE ]; then
    wget $NDK_URL
fi
if [ ! -f $LIBXML2_ARCHIVE ]; then
    wget $LIBXML2_URL
fi
if [ ! -f $OPENSSL_ARCHIVE ]; then
    wget $OPENSSL_URL
fi
if [ ! -f $NCURSES_ARCHIVE ]; then
    wget $NCURSES_URL
fi
cd ..

# Unpack NDK
if [ ! -d ./$NDK_DIRNAME ]; then
    echo "Unpacking NDK"
    unzip ./downloads/$NDK_ARCHIVE
fi

# Create toolchain for target
echo "Preparing standalone NDK toolchain"
./$NDK_DIRNAME/build/tools/make_standalone_toolchain.py --arch $NDK_ARCH --api $APILEVEL --install-dir $ROOTDIR/output/host/usr

cd $ROOTDIR

# Configure toolchain
export PATH=$PATH:$ROOTDIR/output/host/usr/bin
export CC=$NDK_TARGET-clang
export CXX=$NDK_TARGET-clang++
export AS=$NDK_TARGET-clang
export AR=$NDK_TARGET-ar
export LD=$NDK_TARGET-ld
export RANLIB=$NDK_TARGET-ranlib
export CFLAGS="-fPIE -fPIC"
export CXXFLAGS=$CFLAGS
export LDFLAGS=""

mkdir output/build
ln -s host/usr/sysroot output/staging

cd $ROOTDIR/output/build

# Build OpenSSL (5 minutes)
tar xf ../../../downloads/$OPENSSL_ARCHIVE
cd openssl-$OPENSSL_VERSION
./Configure --prefix=$ROOTDIR/output/staging/usr --sysroot=$ROOTDIR/output/staging no-shared no-dso no-hw no-zlib no-unit-test "$OPENSSL_TARGET"
sed 's:-mandroid::' -i Makefile
make -j2
make install_sw
cd ..

# Build libxml2 (2 minutes)
tar xf ../../../downloads/$LIBXML2_ARCHIVE
cd libxml2-$LIBXML2_VERSION
./configure --host=$NDK_TARGET -prefix=$ROOTDIR/output/staging/usr --disable-dependency-tracking --without-zlib --without-lzma --without-python --disable-shared
sed 's:^PROGRAMS =.*:PROGRAMS = :' -i Makefile
sed 's:^bin_PROGRAMS =.*:bin_PROGRAMS = :' -i Makefile
sed 's:^SUBDIRS =.*:SUBDIRS = include .:' -i Makefile
make -j2
make install
cd ..

# Build NCurses (2 minutes)
tar xf ../../../downloads/$NCURSES_ARCHIVE
cd ncurses-$NCURSES_VERSION
./configure --host=$NDK_TARGET -prefix=$ROOTDIR/output/staging/usr --disable-dependency-tracking --disable-largefile
make -j2
make install
cd ..

cd ..

# Create missing package descriptions
echo "prefix=$ROOTDIR/output/staging/usr

Name: zlib
Description: zlib
Version: 1
Libs: -L\${prefix}/lib -lz
Cflags: -I\${prefix}/include
" > $ROOTDIR/output/staging/usr/lib/pkgconfig/zlib.pc

echo "prefix=$ROOTDIR/output/staging/usr

Name: ncurses
Description: ncurses
Version: 5
Libs: -L\${prefix}/lib -lncurses
Cflags: -I\${prefix}/include
" > $ROOTDIR/output/staging/usr/lib/pkgconfig/ncurses.pc

# Remove "-L${prefix}/lib" and "-L${libdir}" from all packages to fix strange linker error
find $ROOTDIR/output/staging/usr/lib/pkgconfig -type f -exec sed 's:-L\${prefix}/lib::' -i {} \;
find $ROOTDIR/output/staging/usr/lib/pkgconfig -type f -exec sed 's:-L\${libdir}::' -i {} \;

echo "Toolchain creation completed for $ARCH"