#!/usr/bin/env bash

# Copyright 2014, Kornel Benko
# Copyright 2014, Scott Kostyshak

# 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/>.

set -eu

USERNAME=$( grep "/bin/bash" /etc/passwd | perl -pe 's/.*\/(\w+):\/bin\/bash/$1/g' | grep -v "root" )
sudo -u "${USERNAME}" echo "If no error, then USERNAME is valid" >/dev/null || { echo "could not get the user name"; exit 1 ;}

# Not used yet. Eventually add options.
QTSTABLE=1
QTDEV=1
# TODO check that at least one of the above is set.
# The git repo for Qt WebEngine is about 3.3G and LyX doesn't need it. If set
# to 0, no need to download it or build it.
QTWEB=0
CLANG=1

if [ "${CLANG}" = "1" ]; then
  platform="linux-clang"
else
  platform="linux-g++"
fi

# This installs most dependencies.
sudo apt-get -y build-dep qt5-default

# needed (even if using GCC as main compiler) for QDoc. Otherwise, configure gives:
#   "WARNING: QDoc will not be compiled, probably because libclang could not be located. This
#   means that you cannot build the Qt documentation."
# just need to install libclang-dev and the package containing the command llvm-config
sudo apt-get -y install llvm libclang-dev

# don't need to install if CLANG=0, but might as well (this way can test both
# gcc and clang after installation).
sudo apt-get -y install clang

# needed for building Qt
# Alternative: try to give the path directly to Qt when configuring or building.
#              Look at environment variables PYTHONPATH and PYTHONNAME.
ln -s /usr/bin/python3 /usr/bin/python

# this turns on Qt's "GStreamer 1.0" to "yes" in configure output.
sudo apt-get -y install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

# TODO:
# TODO: also check if these should be here or in lyx-tester. any change in configure output???
# If the following package is installed, xvkbd passes capital letters as lowercase
# to LyX. This results in several keytest failures (such as hello-world).
sudo apt-get -y purge libxcb-xkb-dev
sudo apt-get -y install libxkbcommon-dev libxkbcommon-x11-dev      # This does not help xvkbd :(

if [ "${QTWEB}" = "1" ]; then
  # for an updated list of packages, see section for Qt WebEngine here:
  #   https://wiki.qt.io/Building_Qt_5_from_Git
  # see also here:
  #   https://doc.qt.io/qt-5/qtwebengine-platform-notes.html
  sudo apt-get -y install gperf bison flex libgl1-mesa-dev libnspr4-dev mesa-common-dev x11proto-scrnsaver-dev libcap-dev libnspr4-dev libnss3-dev libpci-dev libxss-dev x11proto-scrnsaver-dev
  # configure requires that Python 2 must be installed for building Qt WebEngine
  sudo apt-get -y install python2
fi

# the dir in which we download the source files
qtsrc_d='/usr/src/qt'

# This check is for convenience. On a virtual box, it is nice to
# do a git clone and init once and then test variations through
# cloning of virtual boxes.
if [ ! -d "${qtsrc_d}" ]; then
  sudo mkdir -p "${qtsrc_d}"
  sudo chown ${USERNAME} "${qtsrc_d}"
  cd "${qtsrc_d}"
  sudo -u "${USERNAME}" git clone git://code.qt.io/qt/qt5.git qt5
  cd qt5
  #
  # Qt's git branch policies:
  #   http://qt-project.org/wiki/Branch-Guidelines
  # Here is where we would check out a branch if we don't want dev. e.g.,
  # check out a release:
  #   sudo -u "${USERNAME}" git checkout v5.14.1
  # checkout a branch (e.g., unreleased stable branch):
  #   sudo -u "${USERNAME}" git checkout 5.14.2
  # checkout a beta release:
  #   sudo -u "${USERNAME}" git checkout "v5.15.0-beta2"
  sudo -u "${USERNAME}" git checkout "v5.15.0"
  #
  # This is what downloads the bulk (the "git clone" above only downloads 15 MB).
  if [ "${QTWEB}" = "1" ]; then
    sudo -u "${USERNAME}" ./init-repository
  else
    # configure will automatically not try to build it if it is not init'd.
    sudo -u "${USERNAME}" ./init-repository --module-subset=default,-qtwebengine
  fi
fi


# create build dir and compile
sudo mkdir /usr/BUILD
sudo chown ${USERNAME} /usr/BUILD
sudo -u ${USERNAME} mkdir /usr/BUILD/BuildQt5-dev
cd /usr/BUILD/BuildQt5-dev
# to get list of features, do the following (takes a minute to generate them):
# configure -list-features
# also here:
# https://doc.qt.io/qt-5/configure-options.html
#
# -v adds verbose output (specifically helpful when there's an error)
# TODO: switch back to -developer-build so I can help report breaks?
sudo -u "${USERNAME}" "${qtsrc_d}/qt5/configure" -platform "${platform}" -opensource -nomake examples -nomake tests -confirm-license -v
numCores=$( cat /proc/cpuinfo | grep processor | wc -l )
sudo -u "${USERNAME}" make -j${numCores}

# Uncomment this block if you want the "git" Qt to be used by the whole system.
## Inform the OS about the new libraries
#echo "/usr/BUILD/BuildQt5-dev/qtbase/lib" > qt5.conf
#sudo cp qt5.conf /etc/ld.so.conf.d/qt5.conf
#sudo ldconfig

# Add qt-bin to own path
# vi ~/.pam_environment
#       Append '/usr/BUILD/BuildQt5-dev/qtbase/bin' to PATH
#       e.g. 'PATH DEFAULT=${PATH}:/usr/local/lyx2.2/bin:/usr/local/texlive/2013/bin/x86_64-linux:/usr/BUILD/BuildQt5-dev/qtbase/bin'

# Before compiling lyx, make sure that PATH contains /usr/BUILD/BuildQt5-dev/qtbase/bin