#!/bin/bash
  #Copyright 2013 Ufal MFF UK; Ondrej Platek
  #
  #Licensed under the Apache License, Version 2.0 (the "License");
  #you may not use this file except in compliance with the License.
  #You may obtain a copy of the License at
  #
  #http://www.apache.org/licenses/LICENSE-2.0
  #
  #THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  #KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  #WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  #MERCHANTABLITY OR NON-INFRINGEMENT.
  #See the Apache 2 License for the specific language governing permissions and
  #limitations under the License.
  #
  # This script is attempting to install cffi a Python/C interface
  # Cffi is used to call Kaldi from Python
  # See the documentation at http://cffi.readthedocs.org/en/latest/
  # This script is trying to install cffi 0.6(now the latest version
  # Tell us if you need higher version(if it exists).
  #
  # Also dependencies are installed. Namely:
  # * pycparser >= 2.06: http://code.google.com/p/pycparser/
  # * py.test
  # 
  # NOT INSTALLED DEPENDENCIES (We are letting you to install it!):
  # * Cpython 2.6, 2.7 or PyPy(not tested for Kaldi setup) 
  # * python-dev (Python headers) and libffi-dev (ffi C library)
  # * a C compiler is required to use CFFI during development, but not to run correctly-installed programs that use CFF
  
  echo "**** Installing Cffi and dependencies"
  
  echo "Checking for Python-Dev"
  # copied from http://stackoverflow.com/questions/4848566/check-for-existence-of-python-dev-files-from-bash-script
  if [ ! -e $(python -c 'from distutils.sysconfig import get_makefile_filename as m; print m()') ]; then 
      echo "On Debian/Ubuntu like system install by 'sudo apt-get python-dev' package."
      echo "On Fedora by 'yum install python-devel'"
      echo "On Mac OS X by 'brew install python'"
      echo "Or obtain Python headers other way!"
      exit 1
  fi
  
  echo "Checking for libffi-dev"
  exe_ffi=test_ffi
  src_ffi=$exe_ffi.c
  cat > $src_ffi <<CCODE
  #include <stdio.h>
  #include <ffi.h>
  int main() {
  ffi_cif cif; ffi_type *args[1]; void *values[1]; char *s; int rc;
  /* Initialize the argument info vectors */
  args[0] = &ffi_type_pointer;
  values[0] = &s;
  /* Initialize the cif */
  if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1, &ffi_type_uint, args) == FFI_OK) {
     s = "Hello World!- YOU HAVE ffi INSTALLED";
     ffi_call(&cif, puts, &rc, values);
     /* rc now holds the result of the call to puts */
     /* values holds a pointer to the function's arg, so to
        call puts() again all we need to do is change the
        value of s */
     s = "FFI works!";
     ffi_call(&cif, puts, &rc, values);
   }
  return 0;
  }
  CCODE
  rm -f $exe_ffi  # clean previous attempts
  gcc -o $exe_ffi $src_ffi -lffi  # build 
  chmod u+x $exe_ffi  # make it executable (gcc usually does it too)
  
  # checking the exit status = ffi installed?
  ./$exe_ffi  
  if [ $? -ne 0 ] ; then 
      echo "You have not ffi installed!" 
      echo "On Debian/Ubuntu: sudo apt-get install libffi-dev"
      echo "Fedora: sudo yum libffi-devel"
      echo "Mac OS: brew install libffi"
      exit 1
  fi
  
  
  # names of the extracted directories
  cffiname=cffi-0.6
  pycparsername=pycparser-release_v2.09.1
  pytestname=pytest-2.3.5
  
  # helper function  
  function downloader {
      file=$1; url=$2;
      if [ ! -e "$file" ]; then
          echo "Could not find $file" 
          echo "Trying to download it via wget!"
          
          wget --version  >/dev/null 2>&1 || \
              { echo "This script requires you to first install wget"
              echo "You can also just download $file from $url"
              exit 1; }
  
         wget --no-check-certificate -T 10 -t 3 $url
  
         if [ ! -e $file ]; then
              echo "Download of $file - failed!"
              echo "Aborting script. Please download and install $file manually!"
          exit 1;
         fi
      fi
  }
  
  echo Downloading and extracting cffi
  cffitar=$cffiname.tar.gz
  cffiurl=http://pypi.python.org/packages/source/c/cffi/cffi-0.6.tar.gz
  downloader $cffitar $cffiurl
  tar -xovzf $cffitar || exit 1
  
  echo Downloading and extracting pycparser
  pycparsertar=release_v2.09.1.tar.gz
  pycparserurl=https://github.com/eliben/pycparser/archive/release_v2.09.1.tar.gz
  downloader $pycparsertar $pycparserurl
  tar -xovzf $pycparsertar || exit 1
  
  echo Downloading and extracting pytest
  pytesttar=pytest-2.3.5.tar.gz
  pytesturl=https://pypi.python.org/packages/source/p/pytest/pytest-2.3.5.tar.gz
  downloader $pytesttar $pytesturl
  tar -xovzf $pytesttar || exit 1
  
  # Installing
  prefix="$PWD/python"
  
  python_version=`python -c 'import sys; p1, p2, _, _ , _= sys.version_info;  print "python%d.%d" % (p1, p2)'`
  new_ppath="$prefix/lib/$python_version/site-packages"
  mkdir -p "$new_ppath"
  export PYTHONPATH="$PYTHONPATH:$new_ppath"
  echo; echo "Adding the $new_ppath to PYTHONPATH"
  echo "DO THE SAME IN YOUR PERMANENT SETTINGS TO USE THE CFFI REGULARLY!"; echo
  
  
  echo "*******Installing $pytestname"
  pushd $pytestname
  
  new_path="$prefix/bin"
  export PATH="$PATH:$new_path"
  echo "
  Adding the $new_path to PATH so I can launch the pytest"
  echo "DO THE SAME IN YOUR PERMANENT SETTINGS TO USE THE pytest REGULARLY!
  "
  
  python setup.py install --prefix="$prefix" || exit 1
  popd
  
  
  echo "*******Installing $pycparsername"
  pushd $pycparsername
  python setup.py install --prefix="$prefix" || exit 1
  popd
  
  
  echo "*******Installing $cffiname"
  pushd $cffiname
  # FIXME check the depencies 
  python setup.py install --prefix="$prefix" || exit 1
  popd
  
  
  echo "****** Last check "
  if [ ! -e $(python -c 'import cffi') ]; then 
      echo "Installation failed. Please download and install $file manually!"
  fi
  
  echo; echo SUCCESS ; echo
  echo "ADD the"; echo "$new_ppath"; echo "to PYTHONPATH for using cffi regularly!"; echo