# -*-python-*-
#--------------------------------------------------------------------------------
#
#       OpenAlea.SConsX: SCons extension package for building platform
#                        independant packages.
#
#       Copyright 2006-2009 INRIA - CIRAD - INRA
#
#       File author(s): Christophe Pradal <christophe.prada@cirad.fr>
#
#       Distributed under the Cecill-C License.
#       See accompanying file LICENSE.txt or copy at
#           http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html
#
#       OpenAlea WebSite : http://openalea.gforge.inria.fr
#
#--------------------------------------------------------------------------------
""" Flex configure environment. """

__license__ = "Cecill-C"
__revision__ = "$Id$"

import os, sys
from openalea.sconsx.config import *


class Flex:
   def __init__(self, config):
      self.name = 'flex'
      self.config = config
      self._default = {}


   def default(self):

      if CONDA_ENV:
          if os.name == 'posix':
            base_dir = CONDA_LIBRARY_PREFIX
          else:
            # On windows, the conda package providing flex (m2-flex) is located in Library/usr
            base_dir = os.path.join(CONDA_LIBRARY_PREFIX, 'usr')
          self._default['bin'] = pj(base_dir, 'bin')
          self._default['include'] = pj(base_dir, 'include')
          if not isinstance(platform, Win32):
              self._default['libs'] = ['m','fl']
              self._default['libpath'] = pj(base_dir, 'lib')
      elif isinstance(platform, Win32):
         try:
              # Try to use openalea egg
              from openalea.deploy import get_base_dir
              base_dir = get_base_dir("bisonflex")
              self._default['bin'] = pj(base_dir, 'bin')
              self._default['include'] = pj(base_dir, 'include')
         except:
              self._default['bin'] = pj('C:\\', 'Tools', 'Bin')
              self._default['include'] = pj('C:\\', 'Tools', 'Include')

      elif isinstance(platform, Posix):
         defdir = detect_posix_project_installpath('bin/flex')
         self._default['bin'] = os.path.join(defdir, 'bin')
         self._default['libpath'] = os.path.join(defdir, 'lib')
         self._default['include'] = os.path.join(defdir, 'include')
         self._default['libs'] = ['m','fl']


   def option( self, opts):

      self.default()

      opts.Add('flex_bin', 'Flex binary path',
                self._default['bin'])
      if not isinstance(platform, Win32):
          opts.Add('flex_libpath', 'Flex lib path',
                    self._default['libpath'])
      if not isinstance(platform, Win32):
          opts.Add('flex_libs', 'Flex libs',
                    self._default['libs'])
      opts.Add('flex_include', 'Flex include path',
                self._default['include'])

      opts.Add(BoolVariable('WITH_FLEX',
           'Specify whether you want to compile your project with flex', True))


   def update(self, env):
      """ Update the environment with specific flags """

      if env['WITH_FLEX']:
        flex = env.WhereIs('flex', env['flex_bin'])
        if flex:
          t = Tool('lex', toolpath=[getLocalPath()])
          t(env)
          if not isinstance(platform, Win32):
             env.AppendUnique(LIBS=env['flex_libs'])
             env.AppendUnique(LIBPATH=[env['flex_libpath']])
          env.AppendUnique(CPPPATH=[env['flex_include']])

          env.Replace(LEX=flex)
          env['WITH_FLEX'] = True  
          env.Append(CPPDEFINES =["WITH_FLEX"])
        else:
          import openalea.sconsx.errormsg as em
          em.error("'flex' not found. Flex disabled ...")
          env['WITH_FLEX'] = False  


   def configure(self, config):
      b = WhereIs("flex", config.conf.env['flex_bin'])

      if not b:
        s = """
        Warning !!! Flex not found !
        Please, install Flex and try again.
        """
        print(s)
        sys.exit(-1)


def create(config):
   " Create flex tool "
   flex = Flex(config)

   return flex