#!/bin/bash
  set -u
  set -e
  
  
  # Make sure we are in the tools/ directory.
  if [ `basename $PWD` == extras ]; then
    cd ..
  fi
  
  ! [ `basename $PWD` == tools ] && \
    echo "You must call this script from the tools/ directory" && exit 1;
  
  # Install python-devel package if not already available
  # first, makes sure distutils.sysconfig usable
  if ! $(python -c "import distutils.sysconfig" &> /dev/null); then
      echo "$0: WARNING: python library distutils.sysconfig not usable, this is necessary to figure out the path of Python.h." >&2
      echo "Proceeding with installation." >&2
  else
    # get include path for this python version
    INCLUDE_PY=$(python -c "from distutils import sysconfig as s; print(s.get_python_inc())")
    if [ ! -f "${INCLUDE_PY}/Python.h" ]; then
        echo "$0 : ERROR: python-devel/python-dev not installed" >&2
        if which yum >&/dev/null; then
          # this is a red-hat system
          echo "$0: we recommend that you run (our best guess):"
          echo " sudo yum install python-devel"
        fi
        if which apt-get >&/dev/null; then
          # this is a debian system
          echo "$0: we recommend that you run (our best guess):"
          echo " sudo apt-get install python-dev"
        fi
        exit 1
    fi
  fi
  
  command -v swig >/dev/null 2>&1 || {
    echo >&2 "$0: Error: I require swig but it's not installed.";
    echo >&2 "  Please install swig and run this script again. "
    exit 1;
  }
  
  if [ -d ./g2p ] || [ -d sequitur ] ; then
    echo  >&2 "$0: Warning: old installation of Sequitur found. You should manually"
    echo  >&2 "  delete the directories tools/sequitur and/or tools/g2p and "
    echo  >&2 "  edit the file tools/env.sh and remove manually all references to it"
    exit 1
  fi
  
  if [ ! -d ./sequitur-g2p ] ; then
    git clone https://github.com/sequitur-g2p/sequitur-g2p.git sequitur-g2p ||
    {
      echo  >&2 "$0: Warning: git clone operation ended unsuccessfully"
      echo  >&2 "  I will assume this is because you don't have https support"
      echo  >&2 "  compiled into your git "
      git clone git@github.com:sequitur-g2p/sequitur-g2p.git sequitur-g2p
  
      if [ $? -ne 0 ]; then
        echo  >&2 "$0: Error git clone operation ended unsuccessfully"
        echo  >&2 "  Clone the github repository (https://github.com/sequitur-g2p/sequitur-g2p.git)"
        echo  >&2 "  manually and re-run the script"
      fi
    }
  else
    echo >&2 "$0: Updating the repository -- we will try to merge with local changes (if you have any)"
    (
      cd sequitur-g2p/
      git pull
      # this would work also, but would drop all local modifications
      #git fetch
      #git reset --hard origin/master
    ) || {
      echo >&2 "Failed to do git pull, delete the sequitur dir and run again";
      exit 1
    }
  fi
  
  (
  cd sequitur-g2p
  
  #we had some reports that the CPPFLAGS is needed under MacOS X but we could not
  #reproduce it, actually, this, however, seems to work just fine for us
  #the primary issue is that real GNU GCC does not accept that switch
  #in addition, Apple fake g++ based on LLVM version 8.1 prints warning about
  #the libstdc++ should no longer be used.
  if (g++ --version 2>/dev/null | grep -s  "LLVM version 8.0" >/dev/null) ; then
    #Apple fake-g++
    make CXX=g++ CC=gcc CPPFLAGS="-stdlib=libstdc++"
  else
    make CXX=g++ CC=gcc
  fi
  
  # the next two lines deal with the issue that the new setup tools
  # expect the directory in which we will be installing to be visible
  # as module directory to python
  site_packages_dir=$(PYTHONPATH="" python -m site --user-site | grep -oE "lib.*")
  SEQUITUR=$(pwd)/$site_packages_dir
  # some bits of info to troubleshoot this in case people have problems
  echo -n  >&2 "USER SITE: "; PYTHONPATH="" python -m site --user-site
  echo >&2 "SEQUITUR_PACKAGE: ${site_packages_dir:-}"
  echo >&2 "SEQUITUR: $SEQUITUR"
  echo >&2 "PYTHONPATH: ${PYTHONPATH:-}"
  mkdir -p $SEQUITUR
  PYTHONPATH=${PYTHONPATH:-}:$SEQUITUR python setup.py install --prefix `pwd`
  ) || {
    echo >&2 "Problem installing sequitur!"
    exit 1
  }
  
  site_packages_dir=$(cd sequitur-g2p; find ./lib{,64} -type d -name site-packages | head -n 1)
  (
    set +u
    [ ! -z "${SEQUITUR}" ] && \
      echo >&2 "SEQUITUR variable is aleady defined. Undefining..." && \
      unset SEQUITUR
  
    [ -f ./env.sh ] && . ./env.sh
  
    [ ! -z "${SEQUITUR}" ] && \
      echo >&2 "SEQUITUR config is already in env.sh" && exit
  
    wd=`pwd`
    wd=`readlink -f $wd || pwd`
  
    echo "export SEQUITUR=\"$wd/sequitur-g2p\""
    echo "export PATH=\"\$PATH:\${SEQUITUR}/bin\""
    echo "export PYTHONPATH=\"\${PYTHONPATH:-}:\$SEQUITUR/${site_packages_dir}\""
  ) >> env.sh
  
  echo >&2 "Installation of SEQUITUR finished successfully"
  echo >&2 "Please source tools/env.sh in your path.sh to enable it"