#!/bin/bash

#
# Copyright (C) 2025 KonstaKANG
#
# SPDX-License-Identifier: GPL-2.0-or-later
#

if [ ! -d "$ANDROID_NDK_HOME" ]; then
  echo "ANDROID_NDK_HOME environment variable is not properly set!"
  exit 1
fi

export TOOLCHAIN=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64

export TARGET=aarch64-linux-android
export API=35
export CC="$TOOLCHAIN/bin/clang --target=$TARGET$API"
export CXX="$TOOLCHAIN/bin/clang++ --target=$TARGET$API"
export AR=$TOOLCHAIN/bin/llvm-ar
export AS=$CC
export LD=$TOOLCHAIN/bin/ld
export RANLIB=$TOOLCHAIN/bin/llvm-ranlib
export STRIP=$TOOLCHAIN/bin/llvm-strip

echo "Running autoconf..."
aclocal -I ../alsa-lib/utils
cp Makefile.am Makefile.am.ok
cp configure.ac configure.ac.ok
gettextize -c -f --no-changelog
echo "EXTRA_DIST = gettext.m4" > m4/Makefile.am
cp Makefile.am.ok Makefile.am
cp configure.ac.ok configure.ac
touch ltconfig
libtoolize --force --copy --automake
aclocal -I ../alsa-lib/utils
autoheader
automake --foreign --copy --add-missing
touch depcomp
autoconf

ALSA_CONFIG=" \
--datadir=/vendor/usr/share \
--disable-alsatest \
--host=aarch64-linux"

echo "Generating configuration..."
echo "./configure $ALSA_CONFIG $TARGET"
./configure $ALSA_CONFIG $TARGET

cat > include/version.h <<EOF
/*
 *  version.h
 */

#define SND_UTIL_MAJOR		$(cat version | cut -d . -f 1)
#define SND_UTIL_MINOR		$(cat version | cut -d . -f 2)
#define SND_UTIL_SUBMINOR	$(cat version | cut -d . -f 3)
#define SND_UTIL_VERSION	((SND_UTIL_MAJOR<<16)|(SND_UTIL_MINOR<<8)|SND_UTIL_SUBMINOR)
#define SND_UTIL_VERSION_STR	"$(cat version)"
EOF

enable_header() {
  sed -i "s/\/\* #undef $1 \*\//#define $1 1/" include/aconfig.h
}

# Enable alsa headers that we have. Setting include path using --with-alsa-inc-prefix doesn't work when cross-compiling.
enable_header HAVE_ALSA_MIXER_H
enable_header HAVE_ALSA_PCM_H
enable_header HAVE_ALSA_RAWMIDI_H
enable_header HAVE_ALSA_SEQ_H
enable_header HAVE_ALSA_TOPOLOGY_H
enable_header HAVE_ALSA_USE_CASE_H

exit 0