#!/usr/bin/env python
#
# Script to build and install Python-bindings.
# Version: 20181117

from __future__ import print_function

import glob
import gzip
import platform
import os
import shlex
import shutil
import subprocess
import sys
import tarfile

from distutils import dist
from distutils import sysconfig
from distutils.ccompiler import new_compiler
from distutils.command.build_ext import build_ext
from distutils.command.bdist import bdist
from distutils.command.sdist import sdist
from distutils.core import Extension, setup

try:
  from distutils.command.bdist_msi import bdist_msi
except ImportError:
  bdist_msi = None


if not bdist_msi:
  custom_bdist_msi = None
else:
  class custom_bdist_msi(bdist_msi):
    """Custom handler for the bdist_msi command."""

    def run(self):
      """Builds an MSI."""
      # bdist_msi does not support the library version so we add ".1"
      # as a work around.
      self.distribution.metadata.version = "{0:s}.1".format(
          self.distribution.metadata.version)

      bdist_msi.run(self)


class custom_bdist_rpm(bdist):
  """Custom handler for the bdist_rpm command."""

  def run(self):
    """Builds a RPM."""
    print("'setup.py bdist_rpm' command not supported use 'rpmbuild' instead.")
    sys.exit(1)


class custom_build_ext(build_ext):
  """Custom handler for the build_ext command."""

  def _RunCommand(self, command):
    """Runs the command."""
    arguments = shlex.split(command)
    process = subprocess.Popen(
        arguments, stderr=subprocess.PIPE, stdout=subprocess.PIPE,
        universal_newlines=True)
    if not process:
      raise RuntimeError("Running: {0:s} failed.".format(command))

    output, error = process.communicate()
    if process.returncode != 0:
      error = "\n".join(error.split("\n")[-5:])
      raise RuntimeError("Running: {0:s} failed with error:\n{1:s}.".format(
          command, error))

    return output

  def build_extensions(self):
    """Set up the build extensions."""
    # TODO: move build customization here?
    build_ext.build_extensions(self)

  def run(self):
    """Runs the build extension."""
    compiler = new_compiler(compiler=self.compiler)
    if compiler.compiler_type == "msvc":
      self.define = [
          ("UNICODE", ""),
      ]

    else:
      command = "sh configure --disable-shared-libs"
      output = self._RunCommand(command)

      print_line = False
      for line in output.split("\n"):
        line = line.rstrip()
        if line == "configure:":
          print_line = True

        if print_line:
          print(line)

      self.define = [
          ("HAVE_CONFIG_H", ""),
          ("LOCALEDIR", "\"/usr/share/locale\""),
      ]

    build_ext.run(self)


class custom_sdist(sdist):
  """Custom handler for the sdist command."""

  def run(self):
    """Builds a source distribution (sdist) package."""
    if self.formats != ["gztar"]:
      print("'setup.py sdist' unsupported format.")
      sys.exit(1)

    if glob.glob("*.tar.gz"):
      print("'setup.py sdist' remove existing *.tar.gz files from "
            "source directory.")
      sys.exit(1)

    command = "make dist"
    exit_code = subprocess.call(command, shell=True)
    if exit_code != 0:
      raise RuntimeError("Running: {0:s} failed.".format(command))

    if not os.path.exists("dist"):
      os.mkdir("dist")

    source_package_file = glob.glob("*.tar.gz")[0]
    source_package_prefix, _, source_package_suffix = (
        source_package_file.partition("-"))
    sdist_package_file = "{0:s}-python-{1:s}".format(
        source_package_prefix, source_package_suffix)
    sdist_package_file = os.path.join("dist", sdist_package_file)
    os.rename(source_package_file, sdist_package_file)

    # Create and add the PKG-INFO file to the source package.
    with gzip.open(sdist_package_file, 'rb') as input_file:
      with open(sdist_package_file[:-3], 'wb') as output_file:
        shutil.copyfileobj(input_file, output_file)
    os.remove(sdist_package_file)

    self.distribution.metadata.write_pkg_info(".")
    pkg_info_path = "{0:s}-{1:s}/PKG-INFO".format(
        source_package_prefix, source_package_suffix[:-7])
    with tarfile.open(sdist_package_file[:-3], "a:") as tar_file:
      tar_file.add("PKG-INFO", arcname=pkg_info_path)
    os.remove("PKG-INFO")

    with open(sdist_package_file[:-3], 'rb') as input_file:
      with gzip.open(sdist_package_file, 'wb') as output_file:
        shutil.copyfileobj(input_file, output_file)
    os.remove(sdist_package_file[:-3])

    # Inform distutils what files were created.
    dist_files = getattr(self.distribution, "dist_files", [])
    dist_files.append(("sdist", "", sdist_package_file))


class ProjectInformation(object):
  """Project information."""

  def __init__(self):
    """Initializes project information."""
    super(ProjectInformation, self).__init__()
    self.include_directories = []
    self.library_name = None
    self.library_names = []
    self.library_version = None

    self._ReadConfigureAc()
    self._ReadMakefileAm()

  @property
  def module_name(self):
    """The Python module name."""
    return "py{0:s}".format(self.library_name[3:])

  @property
  def package_name(self):
    """The package name."""
    return "{0:s}-python".format(self.library_name)

  @property
  def package_description(self):
    """The package description."""
    return "Python bindings module for {0:s}".format(self.library_name)

  @property
  def project_url(self):
    """The project URL."""
    return "https://github.com/libyal/{0:s}/".format(self.library_name)

  def _ReadConfigureAc(self):
    """Reads configure.ac to initialize the project information."""
    file_object = open("configure.ac", "rb")
    if not file_object:
      raise IOError("Unable to open: configure.ac")

    found_ac_init = False
    found_library_name = False
    for line in file_object.readlines():
      line = line.strip()
      if found_library_name:
        library_version = line[1:-2]
        if sys.version_info[0] >= 3:
          library_version = library_version.decode("ascii")
        self.library_version = library_version
        break

      elif found_ac_init:
        library_name = line[1:-2]
        if sys.version_info[0] >= 3:
          library_name = library_name.decode("ascii")
        self.library_name = library_name
        found_library_name = True

      elif line.startswith(b"AC_INIT"):
        found_ac_init = True

    file_object.close()

    if not self.library_name or not self.library_version:
      raise RuntimeError(
          "Unable to find library name and version in: configure.ac")

  def _ReadMakefileAm(self):
    """Reads Makefile.am to initialize the project information."""
    if not self.library_name:
      raise RuntimeError("Missing library name")

    file_object = open("Makefile.am", "rb")
    if not file_object:
      raise IOError("Unable to open: Makefile.am")

    found_subdirs = False
    for line in file_object.readlines():
      line = line.strip()
      if found_subdirs:
        library_name, _, _ = line.partition(b" ")
        if sys.version_info[0] >= 3:
          library_name = library_name.decode("ascii")

        self.include_directories.append(library_name)

        if library_name.startswith("lib"):
          self.library_names.append(library_name)

        if library_name == self.library_name:
          break

      elif line.startswith(b"SUBDIRS"):
        found_subdirs = True

    file_object.close()

    if not self.include_directories or not self.library_names:
      raise RuntimeError(
          "Unable to find include directories and library names in: "
          "Makefile.am")


def GetPythonLibraryDirectoryPath():
  """Retrieves the Python library directory path."""
  path = sysconfig.get_python_lib(True)
  _, _, path = path.rpartition(sysconfig.PREFIX)

  if path.startswith(os.sep):
    path = path[1:]

  return path


project_information = ProjectInformation()

PYTHON_LIBRARY_DIRECTORY = GetPythonLibraryDirectoryPath()

SOURCES = []

# TODO: replace by detection of MSC
DEFINE_MACROS = []
if platform.system() == "Windows":
  DEFINE_MACROS.append(("WINVER", "0x0501"))
  # TODO: determine how to handle third party DLLs.
  for library_name in project_information.library_names:
    if library_name != project_information.library_name:
      definition = "HAVE_LOCAL_{0:s}".format(library_name.upper())

    DEFINE_MACROS.append((definition, ""))

# Put everything inside the Python module to prevent issues with finding
# shared libaries since pip does not integrate well with the system package
# management.
for library_name in project_information.library_names:
  for source_file in glob.glob(os.path.join(library_name, "*.[ly]")):
    generated_source_file = "{0:s}.c".format(source_file[:-2])
    if not os.path.exists(generated_source_file):
      raise RuntimeError("Missing generated source file: {0:s}".format(
          generated_source_file))

  source_files = glob.glob(os.path.join(library_name, "*.c"))
  SOURCES.extend(source_files)

source_files = glob.glob(os.path.join(project_information.module_name, "*.c"))
SOURCES.extend(source_files)

# Add the LICENSE file to the distribution.
copying_file = os.path.join("COPYING")
license_file = "LICENSE.{0:s}".format(project_information.module_name)
shutil.copyfile(copying_file, license_file)

LIBRARY_DATA_FILES = [license_file]

# TODO: find a way to detect missing python.h
# e.g. on Ubuntu python-dev is not installed by python-pip

# TODO: what about description and platform in egg file

setup(
    name=project_information.package_name,
    url=project_information.project_url,
    version=project_information.library_version,
    description=project_information.package_description,
    long_description=project_information.package_description,
    author="Joachim Metz",
    author_email="joachim.metz@gmail.com",
    license="GNU Lesser General Public License v3 or later (LGPLv3+)",
    cmdclass={
        "build_ext": custom_build_ext,
        "bdist_msi": custom_bdist_msi,
        "bdist_rpm": custom_bdist_rpm,
        "sdist": custom_sdist,
    },
    ext_modules=[
        Extension(
            project_information.module_name,
            define_macros=DEFINE_MACROS,
            include_dirs=project_information.include_directories,
            libraries=[],
            library_dirs=[],
            sources=SOURCES,
        ),
    ],
    data_files=[(PYTHON_LIBRARY_DIRECTORY, LIBRARY_DATA_FILES)],
)

os.remove(license_file)