# Copyright (c) 2016-present, Gregory Szorc

# All rights reserved.

#

# This software may be modified and distributed under the terms

# of the BSD license. See the LICENSE file for details.

import os

from distutils.extension import Extension

zstd_sources = ['zstd/%s' % p for p in (

    'common/entropy_common.c',

    'common/error_private.c',

    'common/fse_decompress.c',

    'common/pool.c',

    'common/threading.c',

    'common/xxhash.c',

    'common/zstd_common.c',

    'compress/fse_compress.c',

    'compress/huf_compress.c',

    'compress/zstd_compress.c',

    'compress/zstdmt_compress.c',

    'decompress/huf_decompress.c',

    'decompress/zstd_decompress.c',

    'dictBuilder/cover.c',

    'dictBuilder/divsufsort.c',

    'dictBuilder/zdict.c',

)]

zstd_sources_legacy = ['zstd/%s' % p for p in (

    'deprecated/zbuff_common.c',

    'deprecated/zbuff_compress.c',

    'deprecated/zbuff_decompress.c',

    'legacy/zstd_v01.c',

    'legacy/zstd_v02.c',

    'legacy/zstd_v03.c',

    'legacy/zstd_v04.c',

    'legacy/zstd_v05.c',

    'legacy/zstd_v06.c',

    'legacy/zstd_v07.c'

)]

zstd_includes = [

    'c-ext',

    'zstd',

    'zstd/common',

    'zstd/compress',

    'zstd/decompress',

    'zstd/dictBuilder',

]

zstd_includes_legacy = [

    'zstd/deprecated',

    'zstd/legacy',

]

ext_sources = [

    'zstd.c',

    'c-ext/bufferutil.c',

    'c-ext/compressiondict.c',

    'c-ext/compressobj.c',

    'c-ext/compressor.c',

    'c-ext/compressoriterator.c',

    'c-ext/compressionparams.c',

    'c-ext/compressionwriter.c',

    'c-ext/constants.c',

    'c-ext/decompressobj.c',

    'c-ext/decompressor.c',

    'c-ext/decompressoriterator.c',

    'c-ext/decompressionwriter.c',

    'c-ext/frameparams.c',

]

zstd_depends = [

    'c-ext/python-zstandard.h',

]

def get_c_extension(support_legacy=False, name='zstd'):

    """Obtain a distutils.extension.Extension for the C extension."""

    root = os.path.abspath(os.path.dirname(__file__))

    sources = [os.path.join(root, p) for p in zstd_sources + ext_sources]

    if support_legacy:

        sources.extend([os.path.join(root, p) for p in zstd_sources_legacy])

    include_dirs = [os.path.join(root, d) for d in zstd_includes]

    if support_legacy:

        include_dirs.extend([os.path.join(root, d) for d in zstd_includes_legacy])

    depends = [os.path.join(root, p) for p in zstd_depends]

    extra_args = ['-DZSTD_MULTITHREAD']

    if support_legacy:

        extra_args.append('-DZSTD_LEGACY_SUPPORT=1')

    # TODO compile with optimizations.

    return Extension(name, sources,

                     include_dirs=include_dirs,

                     depends=depends,

                     extra_compile_args=extra_args)