# Copyright 2015 The Brotli Authors. All rights reserved.
#
# Distributed under MIT license.
# See file LICENSE for detail or copy at https://opensource.org/licenses/MIT

"""This script is used for building and packaging the Brotli extension."""

import logging
import os
import re

import setuptools
from setuptools import errors, modified
from setuptools.command import build_ext

CURR_DIR = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
LOGGER = logging.getLogger(__name__)


def bool_from_environ(key):
  value = os.environ.get(key)
  if not value:
    return False
  if value == "1":
    return True
  if value == "0":
    return False
  raise ValueError(
      f"Environment variable {key} has invalid value {value}."
      " Please set it to 1, 0 or an empty string"
  )


def get_version():
  """Return library version string from 'common/version.h' file."""
  version_file_path = os.path.join(CURR_DIR, "c", "common", "version.h")
  defs = {}
  with open(version_file_path, "r") as file:
    for line in file:
      m = re.match(r"#define\s+(\w+)\s+(\d+)", line)
      if m:
        defs[m.group(1)] = m.group(2)
  parts = ["MAJOR", "MINOR", "PATCH"]
  major, minor, patch = [defs.get("BROTLI_VERSION_" + key) for key in parts]
  if not major or not minor or not patch:
    return ""
  return f"{major}.{minor}.{patch}"


class BuildExt(build_ext.build_ext):
  """Customized build_ext command to handle Brotli extension building."""

  def get_source_files(self):
    filenames = super().get_source_files()
    for ext in self.extensions:
      filenames.extend(ext.depends)
    return filenames

  def build_extension(self, ext):
    if ext.sources is None or not isinstance(ext.sources, (list, tuple)):
      raise errors.DistutilsSetupError(
          f"in 'ext_modules' option (extension '{ext.name}'), "
          "'sources' must be present and must be "
          "a list of source filenames"
      )

    ext_path = self.get_ext_fullpath(ext.name)
    depends = ext.sources + ext.depends
    is_outdated = modified.newer_group(depends, ext_path, "newer")
    if self.force or is_outdated:
      LOGGER.info("building '%s' extension", ext.name)
    else:
      LOGGER.debug("skipping '%s' extension (up-to-date)", ext.name)
      return

    c_sources = [source for source in ext.sources if source.endswith(".c")]
    extra_args = ext.extra_compile_args or []

    objects = []

    macros = ext.define_macros[:]
    for undef in ext.undef_macros:
      macros.append((undef,))

    objs = self.compiler.compile(
        c_sources,
        output_dir=self.build_temp,
        macros=macros,
        include_dirs=ext.include_dirs,
        debug=self.debug,
        extra_postargs=extra_args,
        depends=ext.depends,
    )
    objects.extend(objs)

    self._built_objects = objects[:]
    if ext.extra_objects:
      objects.extend(ext.extra_objects)
    extra_args = ext.extra_link_args or []
    # When using GCC on Windows, we statically link libgcc and libstdc++,
    # so that we don't need to package extra DLLs.
    if self.compiler.compiler_type == "mingw32":
      extra_args.extend(["-static-libgcc", "-static-libstdc++"])

    ext_path = self.get_ext_fullpath(ext.name)
    # Detect target language, if not provided.
    language = ext.language or self.compiler.detect_language(c_sources)

    self.compiler.link_shared_object(
        objects,
        ext_path,
        libraries=self.get_libraries(ext),
        library_dirs=ext.library_dirs,
        runtime_library_dirs=ext.runtime_library_dirs,
        extra_postargs=extra_args,
        export_symbols=self.get_export_symbols(ext),
        debug=self.debug,
        build_temp=self.build_temp,
        target_lang=language,
    )


NAME = "brotli"

VERSION = get_version()

URL = "https://github.com/google/brotli"

DESCRIPTION = "Python bindings for the Brotli compression library"

AUTHOR = "The Brotli Authors"

LICENSE = "MIT"

PLATFORMS = ["Posix", "MacOS X", "Windows"]

CLASSIFIERS = [
    "Development Status :: 4 - Beta",
    "Environment :: Console",
    "Intended Audience :: Developers",
    "Operating System :: MacOS :: MacOS X",
    "Operating System :: Microsoft :: Windows",
    "Operating System :: POSIX :: Linux",
    "Programming Language :: C",
    "Programming Language :: C++",
    "Programming Language :: Python",
    "Programming Language :: Python :: 3",
    "Programming Language :: Python :: 3.10",
    "Programming Language :: Python :: 3.11",
    "Programming Language :: Python :: 3.12",
    "Programming Language :: Python :: 3.13",
    "Programming Language :: Python :: 3.14",
    "Programming Language :: Unix Shell",
    "Topic :: Software Development :: Libraries",
    "Topic :: Software Development :: Libraries :: Python Modules",
    "Topic :: System :: Archiving",
    "Topic :: System :: Archiving :: Compression",
    "Topic :: Text Processing :: Fonts",
    "Topic :: Utilities",
]

PACKAGE_DIR = {"": "python"}

PY_MODULES = ["brotli"]

USE_SYSTEM_BROTLI = bool_from_environ("USE_SYSTEM_BROTLI")

if USE_SYSTEM_BROTLI:
  import pkgconfig

  REQUIRED_BROTLI_SYSTEM_LIBRARIES = [
      "libbrotlicommon",
      "libbrotlienc",
      "libbrotlidec",
  ]

  define_macros = []
  include_dirs = []
  libraries = []
  library_dirs = []

  for required_system_library in REQUIRED_BROTLI_SYSTEM_LIBRARIES:
    package_configuration = pkgconfig.parse(required_system_library)

    define_macros += package_configuration["define_macros"]
    include_dirs += package_configuration["include_dirs"]
    libraries += package_configuration["libraries"]
    library_dirs += package_configuration["library_dirs"]

  brotli_extension = setuptools.Extension(
      "_brotli",
      sources=["python/_brotli.c"],
      include_dirs=include_dirs,
      define_macros=define_macros,
      libraries=libraries,
      library_dirs=library_dirs,
  )

  EXT_MODULES = [brotli_extension]
else:
  sources = [
      "python/_brotli.c",
      "c/common/constants.c",
      "c/common/context.c",
      "c/common/dictionary.c",
      "c/common/platform.c",
      "c/common/shared_dictionary.c",
      "c/common/transform.c",
      "c/dec/bit_reader.c",
      "c/dec/decode.c",
      "c/dec/huffman.c",
      "c/dec/prefix.c",
      "c/dec/state.c",
      "c/dec/static_init.c",
      "c/enc/backward_references.c",
      "c/enc/backward_references_hq.c",
      "c/enc/bit_cost.c",
      "c/enc/block_splitter.c",
      "c/enc/brotli_bit_stream.c",
      "c/enc/cluster.c",
      "c/enc/command.c",
      "c/enc/compound_dictionary.c",
      "c/enc/compress_fragment.c",
      "c/enc/compress_fragment_two_pass.c",
      "c/enc/dictionary_hash.c",
      "c/enc/encode.c",
      "c/enc/encoder_dict.c",
      "c/enc/entropy_encode.c",
      "c/enc/fast_log.c",
      "c/enc/histogram.c",
      "c/enc/literal_cost.c",
      "c/enc/memory.c",
      "c/enc/metablock.c",
      "c/enc/static_dict.c",
      "c/enc/static_dict_lut.c",
      "c/enc/static_init.c",
      "c/enc/utf8_util.c",
  ]
  headers = [
      "c/common/constants.h",
      "c/common/context.h",
      "c/common/dictionary.h",
      "c/common/platform.h",
      "c/common/shared_dictionary_internal.h",
      "c/common/static_init.h",
      "c/common/transform.h",
      "c/common/version.h",
      "c/dec/bit_reader.h",
      "c/dec/huffman.h",
      "c/dec/prefix.h",
      "c/dec/prefix_inc.h",
      "c/dec/state.h",
      "c/dec/static_init.h",
      "c/enc/backward_references.h",
      "c/enc/backward_references_hq.h",
      "c/enc/backward_references_inc.h",
      "c/enc/bit_cost.h",
      "c/enc/bit_cost_inc.h",
      "c/enc/block_encoder_inc.h",
      "c/enc/block_splitter.h",
      "c/enc/block_splitter_inc.h",
      "c/enc/brotli_bit_stream.h",
      "c/enc/cluster.h",
      "c/enc/cluster_inc.h",
      "c/enc/command.h",
      "c/enc/compound_dictionary.h",
      "c/enc/compress_fragment.h",
      "c/enc/compress_fragment_two_pass.h",
      "c/enc/dictionary_hash.h",
      "c/enc/dictionary_hash_inc.h",
      "c/enc/encoder_dict.h",
      "c/enc/entropy_encode.h",
      "c/enc/entropy_encode_static.h",
      "c/enc/fast_log.h",
      "c/enc/find_match_length.h",
      "c/enc/hash.h",
      "c/enc/hash_composite_inc.h",
      "c/enc/hash_forgetful_chain_inc.h",
      "c/enc/hash_longest_match64_inc.h",
      "c/enc/hash_longest_match_inc.h",
      "c/enc/hash_longest_match_quickly_inc.h",
      "c/enc/hash_rolling_inc.h",
      "c/enc/hash_to_binary_tree_inc.h",
      "c/enc/histogram.h",
      "c/enc/histogram_inc.h",
      "c/enc/literal_cost.h",
      "c/enc/memory.h",
      "c/enc/metablock.h",
      "c/enc/metablock_inc.h",
      "c/enc/params.h",
      "c/enc/prefix.h",
      "c/enc/quality.h",
      "c/enc/ringbuffer.h",
      "c/enc/static_dict.h",
      "c/enc/static_dict_lut.h",
      "c/enc/static_init.h",
      "c/enc/utf8_util.h",
      "c/enc/write_bits.h",
  ]
  brotli_extension = setuptools.Extension(
      "_brotli",
      sources=sources,
      depends=headers,
      include_dirs=["c/include"],
  )
  EXT_MODULES = [brotli_extension]

CMD_CLASS = {
    "build_ext": BuildExt,
}

with open("README.md", "r") as f:
  README = f.read()

setuptools.setup(
    name=NAME,
    description=DESCRIPTION,
    long_description=README,
    long_description_content_type="text/markdown",
    version=VERSION,
    url=URL,
    author=AUTHOR,
    license=LICENSE,
    platforms=PLATFORMS,
    classifiers=CLASSIFIERS,
    package_dir=PACKAGE_DIR,
    py_modules=PY_MODULES,
    ext_modules=EXT_MODULES,
    cmdclass=CMD_CLASS,
)