#!/usr/bin/env python
from __future__ import division, print_function
import os
import shutil
import subprocess
import sys
from distutils.command.build_ext import build_ext
from distutils.sysconfig import get_python_inc

try:
    from setuptools import Extension, setup
except ImportError:
    from distutils.core import Extension, setup


MAJOR      = 0
MINOR      = 100
MICRO      = 0
ISRELEASED = False
VERSION    = '%d.%d.%d' % (MAJOR, MINOR, MICRO)


PACKAGES = [
    'spacy',
    'spacy.tokens',
    'spacy.en',
    'spacy.serialize',
    'spacy.syntax',
    'spacy.munge',
    'spacy.tests',
    'spacy.tests.matcher',
    'spacy.tests.morphology',
    'spacy.tests.munge',
    'spacy.tests.parser',
    'spacy.tests.serialize',
    'spacy.tests.spans',
    'spacy.tests.tagger',
    'spacy.tests.tokenizer',
    'spacy.tests.tokens',
    'spacy.tests.vectors',
    'spacy.tests.vocab']


MOD_NAMES = [
    'spacy.parts_of_speech',
    'spacy.strings',
    'spacy.lexeme',
    'spacy.vocab',
    'spacy.attrs',
    'spacy.morphology',
    'spacy.tagger',
    'spacy.syntax.stateclass',
    'spacy.tokenizer',
    'spacy.syntax.parser',
    'spacy.syntax.transition_system',
    'spacy.syntax.arc_eager',
    'spacy.syntax._parse_features',
    'spacy.gold',
    'spacy.orth',
    'spacy.tokens.doc',
    'spacy.tokens.span',
    'spacy.tokens.token',
    'spacy.serialize.packer',
    'spacy.serialize.huffman',
    'spacy.serialize.bits',
    'spacy.cfile',
    'spacy.matcher',
    'spacy.syntax.ner',
    'spacy.symbols']


if sys.version_info[:2] < (2, 7) or (3, 0) <= sys.version_info[0:2] < (3, 4):
    raise RuntimeError('Python version 2.7 or >= 3.4 required.')


# By subclassing build_extensions we have the actual compiler that will be used which is really known only after finalize_options
# http://stackoverflow.com/questions/724664/python-distutils-how-to-get-a-compiler-that-is-going-to-be-used
compile_options =  {'msvc'  : ['/Ox', '/EHsc'],
                    'other' : ['-O3', '-Wno-strict-prototypes', '-Wno-unused-function']}
link_options    =  {'msvc'  : [],
                    'other' : []}

if sys.platform.startswith('darwin'):
    compile_options['other'].append('-mmacosx-version-min=10.8')
    compile_options['other'].append('-stdlib=libc++')
    link_options['other'].append('-lc++')


class build_ext_options:
    def build_options(self):
        for e in self.extensions:
            e.extra_compile_args = compile_options.get(
                self.compiler.compiler_type, compile_options['other'])
        for e in self.extensions:
            e.extra_link_args = link_options.get(
                self.compiler.compiler_type, link_options['other'])


class build_ext_subclass(build_ext, build_ext_options):
    def build_extensions(self):
        build_ext_options.build_options(self)
        build_ext.build_extensions(self)


# Return the git revision as a string
def git_version():
    def _minimal_ext_cmd(cmd):
        # construct minimal environment
        env = {}
        for k in ['SYSTEMROOT', 'PATH']:
            v = os.environ.get(k)
            if v is not None:
                env[k] = v
        # LANGUAGE is used on win32
        env['LANGUAGE'] = 'C'
        env['LANG'] = 'C'
        env['LC_ALL'] = 'C'
        out = subprocess.Popen(cmd, stdout = subprocess.PIPE, env=env).communicate()[0]
        return out

    try:
        out = _minimal_ext_cmd(['git', 'rev-parse', 'HEAD'])
        GIT_REVISION = out.strip().decode('ascii')
    except OSError:
        GIT_REVISION = 'Unknown'

    return GIT_REVISION


def get_version_info():
    # Adding the git rev number needs to be done inside write_version_py(),
    # otherwise the import of spacy.about messes up the build under Python 3.
    FULLVERSION = VERSION
    if os.path.exists('.git'):
        GIT_REVISION = git_version()
    elif os.path.exists('spacy/about.py'):
        # must be a source distribution, use existing version file
        try:
            from spacy.about import git_revision as GIT_REVISION
        except ImportError:
            raise ImportError('Unable to import git_revision. Try removing '
                              'spacy/about.py and the build directory '
                              'before building.')
    else:
        GIT_REVISION = 'Unknown'

    if not ISRELEASED:
        FULLVERSION += '.dev0+' + GIT_REVISION[:7]

    return FULLVERSION, GIT_REVISION


def write_version_py(filename='spacy/about.py'):
    cnt = """# THIS FILE IS GENERATED FROM SPACY SETUP.PY
short_version = '%(version)s'
version = '%(version)s'
full_version = '%(full_version)s'
git_revision = '%(git_revision)s'
release = %(isrelease)s
if not release:
    version = full_version
"""
    FULLVERSION, GIT_REVISION = get_version_info()

    with open(filename, 'w') as f:
        f.write(cnt % {'version': VERSION,
                       'full_version' : FULLVERSION,
                       'git_revision' : GIT_REVISION,
                       'isrelease': str(ISRELEASED)})


def generate_cython():
    cwd = os.path.abspath(os.path.dirname(__file__))
    print('Cythonizing sources')
    p = subprocess.call([sys.executable,
                         os.path.join(cwd, 'bin', 'cythonize.py'),
                         'spacy'],
                         cwd=cwd)
    if p != 0:
        raise RuntimeError('Running cythonize failed')


def clean():
    for name in MOD_NAMES:
        name = name.replace('.', '/')
        for ext in ['.so', '.html', '.cpp', '.c']:
            if os.path.exists(name + ext):
                os.unlink(name + ext)


def setup_package():
    src_path = os.path.dirname(os.path.abspath(sys.argv[0]))
    old_path = os.getcwd()
    os.chdir(src_path)
    sys.path.insert(0, src_path)

    # Rewrite the version file everytime
    write_version_py()

    include_dirs = [
        get_python_inc(plat_specific=True),
        os.path.join(src_path, 'include')]

    ext_modules = []
    for mod_name in MOD_NAMES:
        mod_path = mod_name.replace('.', '/') + '.cpp'
        ext_modules.append(
            Extension(mod_name, [mod_path],
                language='c++', include_dirs=include_dirs))

    metadata = dict(
        name='spacy',
        packages=PACKAGES,
        description='Industrial-strength NLP',
        author='Matthew Honnibal',
        author_email='matt@spacy.io',
        version=VERSION,
        url='https://spacy.io',
        license='MIT',
        ext_modules=ext_modules,
        install_requires=['numpy', 'murmurhash == 0.24', 'cymem == 1.30', 'preshed == 0.44',
                          'thinc == 4.0.0', 'text_unidecode', 'plac', 'six',
                          'ujson', 'cloudpickle', 'sputnik == 0.5.2'],
        cmdclass = {
            'build_ext': build_ext_subclass},
    )

    # Run build
    cwd = os.path.abspath(os.path.dirname(__file__))
    if not os.path.exists(os.path.join(cwd, 'PKG-INFO')):
        # Generate Cython sources, unless building from source release
        generate_cython()

        # sync include dirs from native dependencies
        include_dir = os.path.join(src_path, 'include')
        if os.path.exists(include_dir):
            shutil.rmtree(include_dir)
        os.mkdir(include_dir)

        import numpy
        shutil.copytree(
            os.path.join(numpy.get_include(), 'numpy'),
            os.path.join(include_dir, 'numpy'))

        import murmurhash
        shutil.copytree(
            os.path.join(os.path.dirname(murmurhash.__file__), 'headers', 'murmurhash'),
            os.path.join(include_dir, 'murmurhash'))

    try:
        setup(**metadata)
    finally:
        del sys.path[0]
        os.chdir(old_path)


if __name__ == '__main__':
    if sys.argv[1] == 'clean':
        clean()
    else:
        setup_package()