#!/bin/bash

# Copyright 2015, 2017, 2019  Eric Hameleers, Eindhoven, NL
# Copyright 2020, 2023  Patrick J. Volkerding, Sebeka, Minnesota, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=opencv
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-2}
TAG=${TAG:-""}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | grep -E -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    loongarch64) ARCH=loong64 ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD$TAG.txz"
  exit 0
fi

NUMJOBS=${NUMJOBS:-" -j $(expr $(nproc) + 1) "}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "loong64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

rm -rf $PKG
mkdir -p $TMP $PKG

cd $TMP
rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.?z || exit 1
cd $PKGNAM-$VERSION || exit 1

tar xvf $CWD/${PKGNAM}_contrib-${VERSION}.tar.?z || exit 1

# Fix rgb compilation errors; glBindRenderbufferEXT() and some others
# are GLEW, not GL APIs:
cd ${PKGNAM}_contrib-${VERSION}
  cat $CWD/patches/opencv_rgb_glew.patch | patch -p1 --verbose || exit 1
cd - > /dev/null

chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \+

# Configure, build, and install:
mkdir cmake-build
cd cmake-build
  cmake \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_C_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_BUILD_TYPE="Release" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DINSTALL_MAN_DIR=man \
    -DINSTALL_DOC_DIR=doc/$PKGNAM-$VERSION \
    -DSYSCONF_INSTALL_DIR=/etc \
    -DLIB_SUFFIX=${LIBDIRSUFFIX} \
    -DLIB_INSTALL_DIR=/usr/lib${LIBDIRSUFFIX} \
    -DBUILD_CUDA_STUBS=OFF \
    -DBUILD_PACKAGE=OFF \
    -DBUILD_PERF_TESTS=OFF \
    -DBUILD_SHARED_LIBS=ON \
    -DBUILD_TESTS=OFF \
    -DBUILD_WITH_DEBUG_INFO=OFF \
    -DENABLE_PRECOMPILED_HEADERS=OFF \
    -DWITH_CUDA=OFF \
    -DWITH_FFMPEG=ON \
    -DWITH_GDAL=OFF \
    -DWITH_IPP=OFF \
    -DWITH_OPENGL=ON \
    -DWITH_OPENMP=ON \
    -DWITH_QT=ON \
    -DWITH_VULKAN=ON \
    -DWITH_WAYLAND=ON \
    -DWITH_XINE=ON \
    -DOPENCV_ENABLE_NONFREE=ON \
    -DOPENCV_EXTRA_MODULES_PATH=../${PKGNAM}_contrib-$VERSION/modules \
    -DOPENCV_GENERATE_PKGCONFIG=ON \
    -DOPENCV_JNI_INSTALL_PATH=lib${LIBDIRSUFFIX} \
    .. || exit 1
  make $NUMJOBS || make || exit 1
  make install DESTDIR=$PKG || exit 1
cd ..

# COMMENTED OUT as mlt finds opencv4.pc just fine.
# Add a symlink to opencv.pc to make eg. mlt find it:
#( cd $PKG/usr/lib${LIBDIRSUFFIX}/pkgconfig ; ln -sf opencv4.pc opencv.pc )

# Strip binaries:
find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  COPYING* README* \
  $PKG/usr/doc/${PKGNAM}-$VERSION
mv $PKG/usr/share/licenses $PKG/usr/doc/${PKGNAM}-$VERSION

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD$TAG.txz