# Tested on Linux Mint 22 Wilma (based on Ubuntu 24.04)

# Manual Installation of geant4
# Will require about 3GB of storage space including Geant4 datasets

# Create your workspace folder and enter the folder, e.g.
mkdir -p $HOME/software/geant4 && cd $_

# Download Geant4 distribution
GEANT_RELEASE=v11.4.0
wget https://gitlab.cern.ch/geant4/geant4/-/archive/${GEANT_RELEASE}/geant4-${GEANT_RELEASE}.tar.gz

# If download successful, uncompress the archive
tar zxvf geant4-${GEANT_RELEASE}.tar.gz

# create build directory
mv geant4-${GEANT_RELEASE}{,-src}
mkdir geant4-${GEANT_RELEASE}{,-build}
cd geant4-${GEANT_RELEASE}-build

# install pre-requisite packages
sudo apt install libxerces-c3.2 \
     libxerces-c-dev \
     libx11-dev \
     libxmu-dev \
     libcoin-dev \
     libxt-dev \
     libxext-dev \
     libsimage-dev \
     libxm4 \
     libmotif-dev \
     libmotif-common

# Look for Qt5 library/tools in your system
sudo apt-cache search qt5 | grep '^qt5-default'
# --- qt5-default - Qt 5 development defaults package

# if you see the above  do,
sudo apt install qt5-default qt5-style-plugin-motif

# else do
sudo apt install qt5-assistant qtcreator qtbase5-dev qttools5-dev  # (for most recent Ubuntu/Mint distributions)

# for v11.4.0 qt6 is required
sudo apt install qt6-tools-dev

# Now prepare makefiles with cmake
cmake -DCMAKE_INSTALL_PREFIX=../geant4-${GEANT_RELEASE} -DGEANT4_BUILD_MULTITHREADED=ON \
                                                        -DGEANT4_INSTALL_DATA=OFF \
                                                        -DGEANT4_USE_QT=ON \
                                                        -DGEANT4_USE_GDML=ON \
                                                        -DGEANT4_USE_OPENGL_X11=ON \
                                                        -DGEANT4_BUILD_STORE_TRAJECTORY=ON \
                                                        -DGEANT4_USE_RAYTRACER_X11=ON \
                                                        -DGEANT4_USE_SYSTEM_EXPAT=ON \
                                                        -DGEANT4_USE_SYSTEM_ZLIB=ON  \
                                                        -DGEANT4_USE_XM=ON ../geant4-${GEANT_RELEASE}-src
# now compile and install
make -jN ## (e.g N=4 based on the number of cores on your system)
make install

# Installation complete!

# Copy GEANT4 datasets (OPTIONAL)
# Warning! Large amount of data will be downloaded
# Check if you can copy the datasets offline
mkdir -p ../geant4-${GEANT_RELEASE}/share/Geant4/data && cd $_
for dset in $(echo https://cern.ch/geant4-data/datasets/G4NDL.4.7.1.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4EMLOW.8.8.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4PhotonEvaporation.6.1.2.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4RadioactiveDecay.6.1.2.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4PARTICLEXS.4.2.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4PII.1.3.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4RealSurface.2.2.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4SAIDDATA.2.0.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4ABLA.3.3.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4INCL.1.3.tar.gz \
		   https://cern.ch/geant4-data/datasets/G4ENSDFSTATE.3.0.tar.gz)
do
  wget $dset && tar zxvf $(basename $dset)
done

# After successful installation of geant4, build applications (e.g B1)
cd $HOME/software/geant4

# copy the examples folder from the geant4 src directory
rsync -avz --progress geant4-${GEANT_RELEASE}-src/examples .
cd examples/basic
mkdir -p B1-build && cd $_
cmake -DCMAKE_PREFIX_PATH=$HOME/software/geant4/geant4-${GEANT_RELEASE} ../B1
make

# finally, you can run the example now
# Note that, geant4 datasets should be available by now
source $HOME/software/geant4/geant4-${GEANT_RELEASE}/bin/geant4.sh
./exampleB1