#from numpy.distutils.extension import Extension
#from Cython.Distutils import build_ext

from numpy.distutils.command import build_src
import Cython
import Cython.Compiler.Main
build_src.Pyrex = Cython
build_src.have_pyrex = True
import os
os.environ["CC"] = "g++"
os.environ["CXX"] = "g++"

def have_pyrex():
    import sys
    try:
        import Cython.Compiler.Main
        sys.modules['Pyrex'] = Cython
        sys.modules['Pyrex.Compiler'] = Cython.Compiler
        sys.modules['Pyrex.Compiler.Main'] = Cython.Compiler.Main
        return True
    except ImportError:
        return False
build_src.have_pyrex = have_pyrex

##########################
# BEGIN additionnal code #
##########################
from numpy.distutils.misc_util import appendpath
from numpy.distutils import log
from os.path import join as pjoin, dirname
from distutils.dep_util import newer_group
from distutils.errors import DistutilsError


def generate_a_pyrex_source(self, base, ext_name, source, extension):
    ''' Monkey patch for numpy build_src.build_src method
    Uses Cython instead of Pyrex.
    Assumes Cython is present
    '''
    if self.inplace:
        target_dir = dirname(base)
    else:
        target_dir = appendpath(self.build_src, dirname(base))
    target_file = pjoin(target_dir, ext_name + '.c')
    depends = [source] + extension.depends
    if self.force or newer_group(depends, target_file, 'newer'):
        import Cython.Compiler.Main
        log.info("cythonc:> %s" % (target_file))
        self.mkpath(target_dir)
        options = Cython.Compiler.Main.CompilationOptions(
            defaults=Cython.Compiler.Main.default_options,
            include_path=extension.include_dirs,
            output_file=target_file)
        cython_result = Cython.Compiler.Main.compile(source, options=options)
        if cython_result.num_errors != 0:
            raise DistutilsError("%d errors while compiling %r with Cython" % (cython_result.num_errors, source))
    return target_file

build_src.build_src.generate_a_pyrex_source = generate_a_pyrex_source
########################
# END additionnal code #
########################

def configuration(parent_package='',top_path=None):
    from numpy.distutils.misc_util import Configuration,get_numpy_include_dirs
    config=Configuration('clib',parent_package,top_path)
    config.add_extension('cutils',
            ['cutils.pyx'],
            depends=['cutils.cpp'],
            libraries=[],include_dirs=[get_numpy_include_dirs(),os.curdir])
    return config

if __name__=='__main__':
    from numpy.distutils.core import setup
    setup(configuration=configuration)
