"""Script to make RDKit.DotNetWrapper.

Notes:
    This is tested for rdkit-Release_2019.09.1 and 2020.09.1
"""
import argparse
import configparser
import glob
import logging
import os
import platform
import re
import shutil
import subprocess
import sys
import typing
import xml.etree.ElementTree as ET
from os import PathLike
from pathlib import Path
from subprocess import PIPE
from typing import (
    Any,
    Collection,
    Dict,
    Iterable,
    List,
    Literal,
    Mapping,
    Optional,
    Sequence,
    Tuple,
    Union,
    cast,
)
from xml.etree.ElementTree import ElementTree, SubElement

_BUILD_STATIC_LIB = False

logging.basicConfig(level=logging.DEBUG)
project_name: str = "RDKit.DotNetWrap"

VisualStudioVersion = Literal["15.0", "16.0"]
CpuModel = Literal["x86", "x64"]
MSPlatform = Literal["Win32", "x64"]
AddressModel = Literal[32, 64]
MSVCInternalVersion = Literal["14.1", "14.2"]
SupportedSystem = Literal["win", "linux"]

here = Path(__file__).parent.resolve()

_platform_system_to_system: Mapping[str, SupportedSystem] = {
    "Windows": "win",
    "Linux": "linux",
}

_vs_ver_to_cmake_option_catalog: Mapping[VisualStudioVersion, Mapping[CpuModel, Sequence[str]]] = {
    "15.0": {"x86": ['-G"Visual Studio 15 2017"'], "x64": ['-G"Visual Studio 15 2017 Win64"'],},
    "16.0": {
        "x86": ['-G"Visual Studio 16 2019"', "-AWin32"],
        "x64": ['-G"Visual Studio 16 2019"'],
    },
}
_platform_to_ms_form: Mapping[CpuModel, MSPlatform] = {
    "x86": "Win32",
    "x64": "x64",
}
_platform_to_address_model: Mapping[CpuModel, AddressModel] = {
    "x86": 32,
    "x64": 64,
}
_vs_to_msvc_internal_ver: Mapping[VisualStudioVersion, MSVCInternalVersion] = {
    "15.0": "14.1",
    "16.0": "14.2",
}


def get_os() -> SupportedSystem:
    pf = platform.system()
    if pf not in _platform_system_to_system:
        raise RuntimeError
    return _platform_system_to_system[pf]


def get_value(dic: Mapping[str, str], key: Optional[str]) -> str:
    if key is None:
        raise ValueError
    if key not in dic:
        raise ValueError
    return dic[key]


def make_or_restore_bak(filename: PathLike) -> None:
    bak_filename = f"{filename}.bak"
    if os.path.exists(bak_filename):
        shutil.copy2(bak_filename, filename)
    else:
        shutil.copy2(filename, bak_filename)


def replace_file_string(
    filename: PathLike, pattern_replace: Sequence[Tuple[str, str]], make_backup: bool = False,
):
    if make_backup:
        make_or_restore_bak(filename)
    filedata: str
    with open(filename, "r", encoding="utf-8") as file:
        filedata = file.read()
        for pattern, replace in pattern_replace:
            filedata = re.sub(pattern, replace, filedata, flags=re.MULTILINE | re.DOTALL)
    with open(filename, "w", encoding="utf-8") as file:
        file.write(filedata)


def insert_line_after(
    filename: PathLike, insert_after: Mapping[str, str], make_backup: bool = False,
):
    if make_backup:
        make_or_restore_bak(filename)
    new_lines: List[str] = []
    with open(filename, "r", encoding="utf-8") as file:
        for line in file.readlines():
            if line[-1] == "\n":
                line = line[:-1]
            new_lines.append(line)
            if line in insert_after:
                new_lines.append(insert_after[line])
    with open(filename, "w", encoding="utf-8") as file:
        file.write("\n".join(new_lines) + "\n")


def call_subprocess(cmd: Sequence[str]) -> None:
    try:
        _env: Dict[str, str] = {}
        _env.update(os.environ)
        _CL_env_for_MSVC: Mapping[str, str] = {
            "CL": "/source-charset:utf-8 /execution-charset:utf-8"
        }
        _env.update(_CL_env_for_MSVC)
        logging.info(f"pwd={os.path.abspath(os.curdir)}")
        if get_os() == "win":
            cmdline = " ".join([s for s in cmd if s])
            logging.info(cmdline)
            subprocess.check_call(cmdline, env=_env)
        else:
            logging.info(cmd)
            subprocess.check_call(cmd, env=_env)
    except subprocess.CalledProcessError as e:
        logging.warning(e)
        sys.exit(e.returncode)


def remove_if_exist(path: Path):
    if path.exists():
        if path.is_file():
            path.unlink()
        elif path.is_dir():
            shutil.rmtree(path)


def makefile_to_lines(filename: PathLike) -> Iterable[str]:
    lines: List[str] = []
    with open(filename, "r") as f:
        for line in f.readlines():
            if line.endswith("\n"):
                line = line[:-1]
            if line.endswith("\\"):
                lines.append(line[:-1])
            else:
                lines.append(line)
                yield re.sub("[ \\t]+", " ", "".join(lines))
                lines = []


def match_and_add(pattern: re.Pattern, dest: List[str], line: str) -> None:
    match = pattern.match(line)
    if match:
        for name in [s.strip() for s in match["name"].split(" ")]:
            if name and name != "$(NULL)":
                dest.append(name)


def get_value_from_env(env: str, default: Optional[str] = None) -> Optional[str]:
    if env not in os.environ:
        return default
    return os.environ[env]


def get_vs_ver() -> VisualStudioVersion:
    env_name = "VisualStudioVersion"
    vs_version = get_value_from_env(env_name)
    if not vs_version:
        raise ValueError(f"{env_name} is empty.")
    if vs_version not in typing.get_args(VisualStudioVersion):
        raise ValueError(f"Unknown Visual Studio version: {vs_version}.")
    return cast(VisualStudioVersion, vs_version)


def get_msvc_internal_ver() -> MSVCInternalVersion:
    return _vs_to_msvc_internal_ver[get_vs_ver()]


def load_msbuild_xml(path: PathLike) -> ElementTree:
    ns = {"msbuild": "http://schemas.microsoft.com/developer/msbuild/2003"}
    ET.register_namespace("", ns["msbuild"])
    tree = ET.parse(path)
    return tree


class Config:
    def __init__(self):
        self.this_path: Optional[Path] = None
        self.rdkit_path: Optional[Path] = None
        self.boost_path: Optional[Path] = None
        self.eigen_path: Optional[Path] = None
        self.zlib_path: Optional[Path] = None
        self.libpng_path: Optional[Path] = None
        self.pixman_path: Optional[Path] = None
        self.cairo_path: Optional[Path] = None
        self.freetype_path: Optional[Path] = None
        self.minor_version: int = 1
        self.cairo_support: bool = False
        self.swig_patch_enabled: bool = True
        self.test_enabled: bool = False


class NativeMaker:
    def __init__(self, config: Config, build_platform: Optional[CpuModel] = None):
        self.build_platform: Optional[CpuModel] = build_platform
        self.config = config

    @property
    def g_option_of_cmake(self) -> Sequence[str]:
        if get_os() == "linux":
            return ["-GUnix Makefiles"]
        if get_os() == "win":
            assert self.build_platform
            return _vs_ver_to_cmake_option_catalog[get_vs_ver()][self.build_platform]
        raise RuntimeError

    @property
    def build_dir_name(self) -> str:
        assert self.build_platform
        return f"build{self.build_platform}"

    @property
    def build_dir_name_for_csharp(self) -> str:
        assert self.build_platform
        return f"build{get_os()}{self.build_platform}CSharp"

    @property
    def ms_build_platform(self) -> MSPlatform:
        assert self.build_platform
        return _platform_to_ms_form[self.build_platform]

    @property
    def address_model(self) -> AddressModel:
        assert self.build_platform
        return _platform_to_address_model[self.build_platform]

    @property
    def this_path(self) -> Path:
        assert self.config.this_path
        return self.config.this_path

    @property
    def rdkit_path(self) -> Path:
        assert self.config.rdkit_path
        return self.config.rdkit_path

    @property
    def boost_path(self) -> Path:
        assert self.config.boost_path
        return self.config.boost_path

    @property
    def eigen_path(self) -> Path:
        assert self.config.eigen_path
        return self.config.eigen_path

    @property
    def zlib_path(self) -> Path:
        assert self.config.zlib_path
        return self.config.zlib_path

    @property
    def libpng_path(self) -> Path:
        assert self.config.libpng_path
        return self.config.libpng_path

    @property
    def pixman_path(self) -> Path:
        assert self.config.pixman_path
        return self.config.pixman_path

    @property
    def freetype_path(self) -> Path:
        assert self.config.freetype_path
        return self.config.freetype_path

    @property
    def cairo_path(self) -> Path:
        assert self.config.cairo_path
        return self.config.cairo_path

    @property
    def boost_bin_path(self) -> Path:
        return self.boost_path / f"lib{self.address_model}-msvc-{get_msvc_internal_ver()}"

    @property
    def rdkit_csharp_build_path(self) -> Path:
        return self.rdkit_path / self.build_dir_name_for_csharp

    @property
    def rdkit_csharp_wrapper_path(self) -> Path:
        return self.rdkit_path / "Code" / "JavaWrappers" / "csharp_wrapper"

    @property
    def rdkit_swig_csharp_path(self) -> Path:
        return self.rdkit_csharp_wrapper_path / "swig_csharp"

    def get_rdkit_version(self) -> int:
        return int(re.sub(r".*_(\d\d\d\d)_(\d\d)_(\d)", r"\1\2\3", str(self.config.rdkit_path)))

    def get_version_for_nuget(self) -> str:
        return f"0.{self.get_rdkit_version()}.{self.config.minor_version}"

    def get_version_for_rdkit_dotnetwrap(self) -> str:
        num = self.get_rdkit_version()
        major, minor, build, revision = (
            0,
            (num // 10) % 10000,
            num % 10,
            self.config.minor_version,
        )
        return f"{major}.{minor}.{build}.{revision}"

    def get_version_for_rdkit(self) -> str:
        num = self.get_rdkit_version()
        return f"{num // 1000}_{('00' + str((num % 1000) // 10))[-2:]}_{num % 10}"

    def get_version_for_boost(self) -> str:
        return re.sub(r".*(\d+_\d+_\d+)", r"\1", str(self.boost_path))

    def get_version_for_eigen(self) -> str:
        return re.sub(r".*(\d+\.\d+\.\d+)", r"\1", str(self.eigen_path))

    def get_version_for_zlib(self) -> str:
        return re.sub(r".*(\d+\.\d+\.\d+)", r"\1", str(self.zlib_path))

    def get_version_for_libpng(self) -> str:
        return re.sub(r".*lpng(\d)(\d)(\d\d)", r"\1.\2.\3", str(self.libpng_path))

    def get_version_for_freetype(self) -> str:
        return re.sub(r".*(\d+\.\d+\.\d+)", r"\1", str(self.freetype_path))

    def get_version_for_pixman(self) -> str:
        return re.sub(r".*(\d+\.\d+\.\d+)", r"\1", str(self.pixman_path))

    def get_version_for_cairo(self) -> str:
        return re.sub(r".*(\d+\.\d+\.\d+)", r"\1", str(self.cairo_path))

    def run_msbuild(self, proj: Union[PathLike, str], platform: Optional[str] = None) -> None:
        if not platform:
            platform = self.ms_build_platform
        cmd = [
            "MSBuild",
            str(proj),
            f"/p:Configuration=Release,Platform={platform}",
            "/maxcpucount",
        ]
        call_subprocess(cmd)

    def make_zlib(self) -> None:
        build_path = self.zlib_path / self.build_dir_name
        build_path.mkdir(exist_ok=True)
        _curdir = os.path.abspath(os.curdir)
        try:
            os.chdir(build_path)
            cmd = ["cmake", str(self.zlib_path)] + list(self.g_option_of_cmake)
            call_subprocess(cmd)
            self.run_msbuild("zlib.sln")
            shutil.copy2(build_path / "zconf.h", self.zlib_path)
        finally:
            os.chdir(_curdir)

    def make_libpng(self) -> None:
        build_path = self.libpng_path / self.build_dir_name
        build_path.mkdir(exist_ok=True)
        _curdir = os.path.abspath(os.curdir)
        try:
            os.chdir(build_path)
            zlib_lib = self.zlib_path / self.build_dir_name / "Release" / "zlib.lib"
            cmd = (
                ["cmake", str(self.libpng_path)]
                + list(self.g_option_of_cmake)
                + [
                    f'-DZLIB_LIBRARY="{zlib_lib}"',
                    f'-DZLIB_INCLUDE_DIR="{str(self.zlib_path)}"',
                    "-DPNG_SHARED=ON",
                    "-DPNG_STATIC=OFF",
                ]
            )
            call_subprocess(cmd)
            self.run_msbuild("libpng.sln")
        finally:
            os.chdir(_curdir)

    def vs15_proj_to_vscurr(self, proj_file: Path) -> None:
        _V = "VCProjectVersion"
        _P = "PlatformToolset"
        replace_file_string(
            proj_file,
            [
                (f"\\<{_V}>15\\.0\\<\\/{_V}\\>", f"<{_V}>{get_vs_ver()}</{_V}>",),
                (
                    f"\\<{_P}\\>v141\\<\\/{_P}\\>",
                    f"<{_P}>v{get_msvc_internal_ver().replace('.', '')}</{_P}>",
                ),
            ],
        )

    def make_pixman(self) -> None:
        _curdir = os.path.abspath(os.curdir)
        try:
            proj_dir = self.pixman_path / "vc2017"
            proj_dir.mkdir(exist_ok=True)
            os.chdir(proj_dir)
            files_dir = self.this_path / "files" / "pixman"
            vcxproj = "pixman.vcxproj"
            shutil.copy2(files_dir / vcxproj, proj_dir)
            proj_file = proj_dir / vcxproj
            shutil.copy2(files_dir / "config.h", self.pixman_path / "pixman")

            self.vs15_proj_to_vscurr(proj_file)

            makefile_win32 = self.pixman_path / "pixman" / "Makefile.win32"
            makefile_sources = self.pixman_path / "pixman" / "Makefile.sources"

            c_files: List[str] = []
            i_files: List[str] = []

            pattern_c = re.compile("^libpixman_sources\\s*\\=(?P<name>.*)$")
            pattern_h = re.compile("^libpixman_headers\\s*\\=(?P<name>.*)$")
            for line in makefile_to_lines(makefile_sources):
                match_and_add(pattern_c, c_files, line)
                match_and_add(pattern_h, i_files, line)

            pattern_c = re.compile("^\\s*libpixman_sources\\s*\\+\\=(?P<name>.*)$")
            for line in makefile_to_lines(makefile_win32):
                match_and_add(pattern_c, c_files, line)

            tree = load_msbuild_xml(proj_file)
            root = tree.getroot()
            item_group = SubElement(root, "ItemGroup")
            for name in c_files:
                node = SubElement(item_group, "ClCompile")
                node.attrib["Include"] = f"..\\pixman\\{name}"
            for name in i_files:
                node = SubElement(item_group, "ClInclude")
                node.attrib["Include"] = f"..\\pixman\\{name}"

            tree.write(proj_file, "utf-8", True)
            self.run_msbuild(proj_file)
        finally:
            os.chdir(_curdir)

    def make_cairo(self) -> None:
        # TODO: get file names from src\Makefile.sources
        _curdir = os.path.abspath(os.curdir)
        try:
            proj_dir = self.cairo_path / "vc2017"
            proj_dir.mkdir(exist_ok=True)
            os.chdir(proj_dir)
            files_dir = self.this_path / "files" / "cairo"
            vcxproj = "cairo.vcxproj"
            shutil.copy2(files_dir / vcxproj, proj_dir)
            proj_file = proj_dir / vcxproj
            shutil.copy2(files_dir / "cairo-features.h", self.cairo_path / "src")
            self.vs15_proj_to_vscurr(proj_file)
            replace_file_string(
                proj_file,
                [
                    ("__CAIRODIR__", str(self.cairo_path).replace("\\", "\\\\"),),
                    ("__LIBPNGDIR__", str(self.libpng_path).replace("\\", "\\\\"),),
                    ("__ZLIBDIR__", str(self.zlib_path).replace("\\", "\\\\"),),
                    ("__PIXMANDIR__", str(self.pixman_path).replace("\\", "\\\\"),),
                    ("__FREETYPEDIR__", str(self.freetype_path).replace("\\", "\\\\"),),
                ],
            )
            self.run_msbuild(vcxproj)
        finally:
            os.chdir(_curdir)

    def make_freetype(self) -> None:
        _curdir = os.path.abspath(os.curdir)
        try:
            os.chdir(self.freetype_path)
            shutil.copy2(
                self.this_path / "files" / "freetype" / "freetype.vcxproj",
                self.freetype_path / "builds" / "windows" / "vc2010",
            )
            os.chdir(self.freetype_path / "builds" / "windows" / "vc2010")
            logging.debug(f"current dir = {os.getcwd()}")
            self.run_msbuild("freetype.sln")
        finally:
            os.chdir(_curdir)

    @property
    def path_GraphMolCSharp_i(self):
        return self.rdkit_csharp_wrapper_path / "GraphMolCSharp.i"

    @property
    def path_MolDraw2D_i(self):
        return self.rdkit_path / "Code" / "JavaWrappers" / "MolDraw2D.i"

    @property
    def path_RDKit2DotNet_folder(self):
        return self.rdkit_csharp_wrapper_path / "RDKit2DotNet"

    def build_rdkit(self) -> None:
        self.rdkit_csharp_build_path.mkdir(exist_ok=True)
        _curdir = os.path.abspath(os.curdir)
        os.chdir(self.rdkit_csharp_build_path)
        try:
            self._patch_i_files()
            self._make_rdkit_cmake()
            self._build_rdkit_native()
        finally:
            os.chdir(_curdir)

    def copy_rdkit_dlls(self) -> None:
        self._copy_dlls()

    def _patch_i_files(self):
        if self.config.swig_patch_enabled:
            replace_file_string(
                self.path_GraphMolCSharp_i,
                [("boost::int32_t", "int32_t",), ("boost::uint32_t", "uint32_t",),],
                make_backup=True,
            )
        if self.config.cairo_support:
            _svg_h = "<GraphMol/MolDraw2D/MolDraw2DSVG.h>"
            _cairo_h = "<GraphMol/MolDraw2D/MolDraw2DCairo.h>"
            dic = {
                f"#include {_svg_h}": f"#include {_cairo_h}",
                f"%include {_svg_h}": f"%include {_cairo_h}",
            }
            insert_line_after(self.path_MolDraw2D_i, dic, make_backup=True)

    def _make_rdkit_cmake(self) -> None:
        cmd: List[str] = self._get_cmake_rdkit_cmd_line()
        if get_os() == "win":
            cmd = [a.replace("\\", "/") for a in cmd]
        call_subprocess(cmd)

    def _get_cmake_rdkit_cmd_line(self) -> List[str]:
        def f_test():
            return "ON" if self.config.test_enabled else "OFF"

        args = [f"{str(self.rdkit_path)}"]
        args += self.g_option_of_cmake
        args += [
            "-DRDK_BUILD_SWIG_WRAPPERS=ON",
            "-DRDK_BUILD_SWIG_CSHARP_WRAPPER=ON",
            "-DRDK_BUILD_SWIG_JAVA_WRAPPER=OFF",
            "-DRDK_BUILD_PYTHON_WRAPPERS=OFF",
        ]
        if self.config.boost_path:
            args += [
                f"-DBOOST_ROOT={str(self.boost_path)}",
                f"-DBOOST_INCLUDEDIR={str(self.boost_path)}",
                f"-DBOOST_LIBRARYDIR={str(self.boost_bin_path)}",
            ]
        if self.config.eigen_path:
            args += [f"-DEIGEN3_INCLUDE_DIR={str(self.eigen_path)}"]
        if self.config.zlib_path:
            zlib_lib_path = self.zlib_path / self.build_dir_name / "Release" / "zlib.lib"
            args += [
                f'-DZLIB_LIBRARIES="{zlib_lib_path}"',
                f'-DZLIB_INCLUDE_DIRS="{self.zlib_path}"',
            ]
        if self.config.cairo_support:
            args += [
                f"-DRDK_BUILD_CAIRO_SUPPORT={'ON' if self.config.cairo_support else 'OFF'}",
            ]
            if self.config.cairo_path:
                cairo_lib_path = (
                    self.cairo_path / "vc2017" / self.ms_build_platform / "Release" / "cairo.lib"
                )
                args += [
                    f'-DCAIRO_INCLUDE_DIRS={self.cairo_path / "src"}',
                    f"-DCAIRO_LIBRARIES={cairo_lib_path}",
                ]
        args += [
            "-DRDK_INSTALL_INTREE=OFF",
            f"-DRDK_BUILD_CPP_TESTS={f_test()}",
            "-DRDK_USE_BOOST_REGEX=ON",
            "-DRDK_BUILD_COORDGEN_SUPPORT=ON",
            "-DRDK_BUILD_MAEPARSER_SUPPORT=ON",
            "-DRDK_OPTIMIZE_POPCNT=ON",
            "-DRDK_BUILD_FREESASA_SUPPORT=ON",
            "-DRDK_BUILD_THREADSAFE_SSS=ON",
            "-DRDK_BUILD_INCHI_SUPPORT=ON",
            "-DRDK_BUILD_AVALON_SUPPORT=ON",
            "-DBoost_NO_BOOST_CMAKE=ON",
            f"-DRDK_BUILD_TEST_GZIP={f_test()}",
        ]

        if self.get_rdkit_version() >= 2020091:
            # needs followings after 2020_09_1
            args += [
                "-DRDK_USE_URF=ON",
            ]
            if get_os() == "win":
                args += [
                    "-DRDK_SWIG_STATIC=OFF",
                    "-DRDK_INSTALL_STATIC_LIBS=OFF",
                ]
                if get_os() == "win":
                    args += ["-DRDK_INSTALL_DLLS_MSVC=ON"]
            if get_os() == "linux":
                if _BUILD_STATIC_LIB:
                    args += [
                        "-DRDK_SWIG_STATIC=ON",
                        "-DRDK_INSTALL_STATIC_LIBS=ON"
                        "-DBOOST_LIBRARYDIR=/usr/lib/x86_64-linux-gnu",
                        "-DBOOST_ROOT=/usr",
                        "-DBoost_USE_STATIC_LIBS=ON",
                    ]
                else:
                    args += [
                        "-DRDK_SWIG_STATIC=OFF",
                        "-DRDK_INSTALL_STATIC_LIBS=OFF",
                    ]
        if self.get_rdkit_version() >= 2020091:
            # freetype supports starts from 2020_09_1
            if self.config.freetype_path:
                freetype_lib_path = (
                    self.freetype_path
                    / "objs"
                    / self.ms_build_platform
                    / "Release"
                    / "freetype.lib"
                )
                freetype_include_path = self.freetype_path / "include"
                args += [
                    f"-DFREETYPE_LIBRARY={freetype_lib_path}",
                    f"-DFREETYPE_INCLUDE_DIRS={freetype_include_path}",
                ]
        return ["cmake"] + args

    def _build_rdkit_native(self) -> None:
        if get_os() == "win":
            self.run_msbuild("RDKit.sln")
        else:
            call_subprocess(["make", "-j", "RDKFuncs"])

    def _copy_dlls(self) -> None:
        assert self.build_platform
        dll_dest_path = self.rdkit_csharp_wrapper_path / get_os() / self.build_platform
        remove_if_exist(dll_dest_path)
        os.makedirs(dll_dest_path)
        logging.info(f"Copy DLLs to {dll_dest_path}.")

        files_to_copy: List[Union[str, PathLike]] = []
        a: Path

        a = self.rdkit_csharp_build_path / "Code" / "JavaWrappers" / "csharp_wrapper"
        if get_os() == "win":
            a = a / "Release" / "RDKFuncs.dll"
        elif get_os() == "linux":
            a = a / "RDKFuncs.so"
        else:
            raise RuntimeError
        files_to_copy.append(a)

        if get_os() == "linux":
            proc = subprocess.run(f"ldd {a}", shell=True, stdout=PIPE, text=True)
            if proc.returncode != 0:
                raise RuntimeError("Failed to execute ldd")
            pat = re.compile(r" \/lib\/x86_64\-linux\-gnu\/([a-zA-Z_\-]+\.so(?:\.[0-9]+)*) ")
            lib_path = Path("/usr/lib/x86_64-linux-gnu")
            for name in re.findall(pat, proc.stdout, flags=0):
                files_to_copy.append(lib_path / name)

        # DLLs of rdkit. Since 2020_09_1 submodules are separated.
        if self.get_rdkit_version() >= 2020091:
            if get_os() == "win":
                lib_path = self.rdkit_csharp_build_path / "bin" / "Release"
                for file_path in lib_path.glob("*.dll"):
                    files_to_copy.append(file_path)
            elif get_os() == "linux":
                lib_path = self.rdkit_csharp_build_path / "lib"
                for file_path in lib_path.glob(f"*.so.1"):
                    files_to_copy.append(file_path)
            else:
                raise RuntimeError

        # TODO: Copy libraries' so files to local.
        if get_os() == "win":
            # DLLs of boost.
            for file_path in self.boost_bin_path.glob("*.dll"):
                if re.match(r".*\-vc\d\d\d\-mt\-x(32|64)\-\d_\d\d\.dll", file_path.name):
                    # boost_python-vc###-mt-x##-#_##.dll is not needed.
                    if not file_path.name.startswith("boost_python"):
                        files_to_copy.append(file_path)

        if get_os() == "win":
            # DLLs of fonttype.
            if self.config.cairo_support or self.get_rdkit_version() >= 2020091:
                files_to_copy.append(
                    self.freetype_path
                    / "objs"
                    / self.ms_build_platform
                    / "Release"
                    / "freetype.dll"
                )
            # DLLs of cairo.
            if self.config.cairo_support:
                files_to_copy += [
                    self.zlib_path / self.build_dir_name / "Release" / "zlib.dll",
                    self.libpng_path / self.build_dir_name / "Release" / "libpng16.dll",
                    self.pixman_path
                    / "vc2017"
                    / self.ms_build_platform
                    / "Release"
                    / "pixman.dll",
                    self.cairo_path / "vc2017" / self.ms_build_platform / "Release" / "cairo.dll",
                ]

        # Copy files.
        for path in files_to_copy:
            shutil.copy2(path, dll_dest_path)

    def build_csharp_wrapper(self) -> None:
        if get_os() == "win":
            self._patch_rdkit_swig_files()
            self._prepare_RDKitDotNet_folder()
            self._copy_test_projects()
            self._build_RDKit2DotNet()
        else:
            raise RuntimeError("Building wrapper is supported only on Windows.")

    def _patch_rdkit_swig_files(self) -> None:
        # Customize the followings if required.
        if self.config.swig_patch_enabled:
            for filepath, patterns in (
                (
                    # extract BOOST_BINARY
                    self.rdkit_swig_csharp_path / "PropertyPickleOptions.cs",
                    [("BOOST_BINARY\\(\\s*([01]+)\\s*\\)", "0b\\1")],
                ),
                (
                    # remove dupulicated methods.
                    self.rdkit_swig_csharp_path / "RDKFuncs.cs",
                    [
                        (
                            "public static double DiceSimilarity\\([^\\}]*\\."
                            "DiceSimilarity__SWIG_(12|13|14)\\([^\\}]*\\}",
                            "",
                        )
                    ],
                ),
            ):
                replace_file_string(filepath, patterns)

        for filepath, patterns in (
            (
                self.rdkit_swig_csharp_path / "RDKFuncsPINVOKE.cs",
                [("(partial )?class RDKFuncsPINVOKE\\s*\\{", "partial class RDKFuncsPINVOKE {",)],
            ),
            (
                self.rdkit_swig_csharp_path / "RDKFuncsPINVOKE.cs",
                [
                    (
                        "static SWIGExceptionHelper\\(\\)\\s*\\{",
                        "static SWIGExceptionHelper() { RDKFuncsPINVOKE.LoadDll();",
                    )
                ],
            ),
        ):
            replace_file_string(filepath, patterns)
        shutil.copy2(
            self.this_path / "files" / "rdkit" / "RDKFuncsPINVOKE_Loader.cs",
            self.rdkit_swig_csharp_path,
        )

    def _prepare_RDKitDotNet_folder(self):
        remove_if_exist(self.path_RDKit2DotNet_folder)
        shutil.copytree(
            self.this_path / "files" / "rdkit" / "RDKit2DotNet",
            self.rdkit_csharp_wrapper_path / "RDKit2DotNet",
        )
        path_RDKit2DotNet_csproj = self.path_RDKit2DotNet_folder / "RDKit2DotNet.csproj"
        rdkit_dotnetwrap_version = self.get_version_for_rdkit_dotnetwrap()
        replace_file_string(
            path_RDKit2DotNet_csproj,
            [
                (
                    r"\<AssemblyVersion\>\d+\.\d+\.\d+\.\d+\<\/AssemblyVersion\>",
                    f"<AssemblyVersion>{rdkit_dotnetwrap_version}</AssemblyVersion>",
                ),
                (
                    r"\<FileVersion\>\d+\.\d+\.\d+\.\d+\<\/FileVersion\>",
                    f"<FileVersion>{rdkit_dotnetwrap_version}</FileVersion>",
                ),
            ],
        )
        tree = load_msbuild_xml(path_RDKit2DotNet_csproj)
        project = tree.getroot()
        property_group = SubElement(project, "PropertyGroup")
        sign_assembly = SubElement(property_group, "SignAssembly")
        sign_assembly.text = "true"
        assembly_originator_key_file = SubElement(property_group, "AssemblyOriginatorKeyFile")
        assembly_originator_key_file.text = "rdkit2dotnet.snk"

        # below is only for convenience to run test project
        item_group = SubElement(project, "ItemGroup")
        for cpu_model in typing.get_args(CpuModel):
            for filename in glob.glob(
                str(self.rdkit_csharp_wrapper_path / get_os() / cpu_model / "*.dll")
            ):
                dllbasename = os.path.basename(filename)
                content = SubElement(item_group, "None")
                path_to_dll = f"..\\\\{get_os()}\\\\{cpu_model}\\\\{dllbasename}"
                link_to_dll = f"runtimes\\\\{get_os()}-{cpu_model}\\\\native\\\\{dllbasename}"
                content.attrib["Include"] = path_to_dll
                content.attrib["Link"] = link_to_dll
                copy_to_output_directory = SubElement(content, "CopyToOutputDirectory")
                copy_to_output_directory.text = "PreserveNewest"
        tree.write(path_RDKit2DotNet_csproj, "utf-8", True)

    @property
    def test_csprojects(self) -> Collection[str]:
        return (
            "RDKit2DotNetTest",
            "RDKit2DotNetTest2",
            "NuGetExample",
            "NuGetExample2",
        )

    @property
    def test_sln_names(self) -> Collection[str]:
        return (
            "RDKit2DotNet.sln",
            "NuGetExample.sln",
        )

    def _copy_test_projects(self):
        path_rdkit_files = self.this_path / "files" / "rdkit"
        for name in self.test_csprojects:
            remove_if_exist(self.rdkit_csharp_wrapper_path / name)
            shutil.copytree(
                path_rdkit_files / name, self.rdkit_csharp_wrapper_path / name, dirs_exist_ok=True,
            )
            replace_file_string(
                self.rdkit_csharp_wrapper_path / name / f"{name}.csproj",
                [
                    (
                        r"\<PackageReference\s+Include\=\"RDKit.DotNetWrap\"\s+"
                        r"Version\=\"\d+\.\d+\.\d+\"\s+\/\>",
                        '<PackageReference Include="RDKit.DotNetWrap" '
                        f'Version="{self.get_version_for_nuget()}" />',
                    )
                ],
            )
        for name in self.test_sln_names:
            shutil.copy2(path_rdkit_files / name, self.rdkit_csharp_wrapper_path)
        print(f"Test slns {self.test_sln_names} are created in {self.rdkit_csharp_wrapper_path}.")
        print("RDKit2DotNetTest: .NET 5.0 example.")
        print("RDKit2DotNetTest2: .NET Framework 4 example.")
        print("NuGetExample: NuGet package example for .NET 5.0.")
        print("NuGetExample2: NuGet package example for .NET Framework 4.")

    def _build_RDKit2DotNet(self):
        _pushd_build_wrapper = os.getcwd()
        try:
            os.chdir(self.path_RDKit2DotNet_folder)
            call_subprocess(["dotnet", "restore"])
            call_subprocess(
                ["MSBuild", "RDKit2DotNet.csproj", "/t:Build", "/p:Configuration=Release"]
            )
        finally:
            os.chdir(_pushd_build_wrapper)

    def build_nuget_package(self) -> None:
        dll_basenames_dic = self._make_dll_basenames_dic()
        self._prepare_nuspec(dll_basenames_dic)
        self._prepare_targets_file(dll_basenames_dic)
        self._build_nupkg()

    def _make_dll_basenames_dic(self) -> Mapping[str, Mapping[str, Sequence[str]]]:
        dll_basenames_dic: Dict[str, Dict[str, List[str]]] = dict()
        for _os in typing.get_args(SupportedSystem):
            if _os not in dll_basenames_dic:
                dll_basenames_dic[_os] = dict()
            for cpu_model in typing.get_args(CpuModel):
                dlls_path = self.rdkit_csharp_wrapper_path / _os / cpu_model
                dll_basenames: List[str] = []
                for filename in glob.glob(str(dlls_path / "*.*")):
                    dll_basenames.append(os.path.basename(filename))
                dll_basenames_dic[_os][cpu_model] = dll_basenames
        assert dll_basenames_dic["win"]["x86"]
        assert dll_basenames_dic["win"]["x64"]
        assert dll_basenames_dic["linux"]["x64"]
        assert not dll_basenames_dic["linux"]["x86"]
        return dll_basenames_dic

    def _prepare_nuspec(self, dll_basenames_dic: Mapping[str, Mapping[str, Sequence[str]]]):
        nuspec_file = shutil.copy2(
            self.this_path / "files" / "rdkit" / f"{project_name}.nuspec",
            self.rdkit_csharp_wrapper_path,
        )
        # RDKit Release_0000_00_0, Boost 0.0.0, FreeType 0.0.0, and Eigen 0.0.0
        lib_versions: List[str] = [
            f"Boost {self.get_version_for_boost()}",
            f"Eigen {self.get_version_for_eigen()}",
            f"FreeType {self.get_version_for_freetype()}",
        ]
        if self.config.cairo_support:
            lib_versions += [
                f"zlib {self.get_version_for_zlib()}",
                f"libpng {self.get_version_for_libpng()}",
                f"pixman {self.get_version_for_pixman()}",
                f"cairo {self.get_version_for_cairo()}",
            ]
        replace_file_string(
            nuspec_file,
            [
                (
                    "\\<version\\>[0-9\\.]*\\<\\/version\\>",
                    f"<version>{self.get_version_for_nuget()}</version>",
                ),
                ("__RDKITVERSION__", f"{self.get_version_for_rdkit()}",),
                ("__LIBVERSIONS__", ", ".join(lib_versions),),
                ("__VISUALSTUDIOVERSION__", f"{get_vs_ver()}",),
            ],
        )
        # write native file info to nuspec file.
        nuspec_dlls_spec = []
        for _os in typing.get_args(SupportedSystem):
            for cpu_model in typing.get_args(CpuModel):
                for dll_basename in dll_basenames_dic[_os][cpu_model]:
                    nuspec_dlls_spec.append(
                        f'<file src="{_os}/{cpu_model}/{dll_basename}" '
                        f'target="runtimes/{_os}-{cpu_model}/native/{dll_basename}" />\n'
                    )
        replace_file_string(nuspec_file, [("\\<nativefiles\\s*\\/\\>", "".join(nuspec_dlls_spec))])

    def _prepare_targets_file(self, dll_basenames_dic: Mapping[str, Mapping[str, Sequence[str]]]):
        targets_file = shutil.copy2(
            self.this_path / "files" / "rdkit" / f"{project_name}.targets",
            self.rdkit_csharp_wrapper_path,
        )
        non_net = (
            "!$(TargetFramework.Contains('netstandard')) "
            "And !$(TargetFramework.Contains('netcoreapp')) "
            "And !$(TargetFramework.Contains('net5'))"
        )
        targets_dlls_spec: List[str] = []
        _os = "win"
        for cpu_model in typing.get_args(CpuModel):
            targets_dlls_spec.append(
                f"<ItemGroup Condition=\"{non_net} And '$(Platform)' == '{cpu_model}' \">\\n"
            )
            for dllname in dll_basenames_dic[_os][cpu_model]:
                targets_dlls_spec.append(
                    '<None Include="$(MSBuildThisFileDirectory)'
                    f'../runtimes/{_os}-{cpu_model}/native/{dllname}">\\n'
                )
                targets_dlls_spec.append(f"<Link>{dllname}</Link>\\n")
                targets_dlls_spec.append(
                    "<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>\\n"
                )
                targets_dlls_spec.append("</None>\\n")
            targets_dlls_spec.append("</ItemGroup>\\n")
        targets_dlls_spec.append(
            f"<ItemGroup Condition=\"{non_net} And '$(Platform)' == 'AnyCPU' \">\\n"
        )
        _os = "win"
        for cpu_model in typing.get_args(CpuModel):
            for dllname in dll_basenames_dic[_os][cpu_model]:
                targets_dlls_spec.append(
                    f'<None Include="$(MSBuildThisFileDirectory)'
                    f'../runtimes/{_os}-{cpu_model}/native/{dllname}">\\n'
                )
                targets_dlls_spec.append(
                    f"<Link>runtimes/{_os}-{cpu_model}/native/{dllname}</Link>\\n"
                )
                targets_dlls_spec.append(
                    "<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>\\n"
                )
                targets_dlls_spec.append("</None>\\n")
        targets_dlls_spec.append("</ItemGroup>")
        replace_file_string(
            targets_file, [("\\<nativefiles\\s*\\/\\>", "".join(targets_dlls_spec))]
        )

    def _build_nupkg(self):
        _curr_dir = os.curdir
        os.chdir(self.rdkit_csharp_wrapper_path)
        try:
            cmd = [
                "nuget",
                "pack",
                f'"{project_name}.nuspec"',
                "-Prop",
                "Configuration=Release",
                "-IncludeReferencedProjects",
            ]
            call_subprocess(cmd)
        finally:
            os.chdir(_curr_dir)

    def clean(self):
        if self.config.rdkit_path:
            for path in (
                self.path_GraphMolCSharp_i,
                self.path_MolDraw2D_i,
            ):
                make_or_restore_bak(path)
            for p in (
                [
                    f"{project_name}.nuspec",
                    f"{project_name}.targets",
                    "swig_csharp",
                    "Properties",
                    "packages",
                ]
                + list(typing.get_args(SupportedSystem))
                + list(self.test_csprojects)
                + list(self.test_sln_names)
            ):
                remove_if_exist(self.rdkit_csharp_wrapper_path / p)
            remove_if_exist(self.rdkit_path / "lib")
            for _os in typing.get_args(SupportedSystem):
                for p in typing.get_args(CpuModel):
                    remove_if_exist(self.rdkit_path / f"build{_os}{p}CSharp")
        if self.config.freetype_path:
            for p in typing.get_args(CpuModel):
                remove_if_exist(self.freetype_path / "objs" / _platform_to_ms_form[p])
        if self.config.zlib_path:
            for p in typing.get_args(CpuModel):
                remove_if_exist(self.zlib_path / "zconf.h")
                remove_if_exist(self.zlib_path / f"build{p}")
        if self.config.libpng_path:
            for p in typing.get_args(CpuModel):
                remove_if_exist(self.libpng_path / f"build{p}")
        if self.config.pixman_path:
            remove_if_exist(self.pixman_path / "vc2017")
        if self.config.cairo_path:
            remove_if_exist(self.cairo_path / "vc2017")


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--build_platform", default="all", choices=list(typing.get_args(CpuModel)) + ["all"]
    )
    parser.add_argument("--disable_swig_patch", default=False, action="store_true")
    for opt in (
        "build_zlib",
        "build_libpng",
        "build_pixman",
        "build_freetype",
        "build_cairo",
        "build_rdkit",
        "build_wrapper",
        "build_nuget",
    ):
        parser.add_argument(f"--{opt}", default=False, action="store_true")
    parser.add_argument("--clean", default=False, action="store_true")
    args = parser.parse_args()

    # x86 is supported only for Windows
    if get_os() == "linux" and args.build_platform == "x86":
        raise RuntimeError("x86 is not supported for Linux system.")
    if get_os() == "linux" and (args.build_platform == "all" or not args.build_platform):
        args.build_platform = "x64"

    config_ini = configparser.ConfigParser()
    config_ini.read("config.ini", encoding="utf-8")
    default_config = config_ini["DEFAULT"]

    config = create_config(args, default_config)

    curr_dir = os.getcwd()
    try:
        if args.clean:
            NativeMaker(config).clean()
        for cpu_model in (
            typing.get_args(CpuModel) if args.build_platform == "all" else [args.build_platform]
        ):
            maker = NativeMaker(config, cpu_model)
            if args.build_freetype:
                maker.make_freetype()
            if args.build_zlib:
                maker.make_zlib()
            if args.build_libpng:
                maker.make_libpng()
            if args.build_pixman:
                maker.make_pixman()
            if args.build_cairo:
                maker.make_cairo()
            if args.build_rdkit:
                maker.build_rdkit()
                maker.copy_rdkit_dlls()
        # if required x64 is used as platform
        maker = NativeMaker(config)
        if args.build_wrapper:
            maker.build_csharp_wrapper()
        if args.build_nuget:
            maker.build_nuget_package()
    finally:
        os.chdir(curr_dir)


def create_config(args: argparse.Namespace, config_info: Any):
    def path_from_ini(env: str) -> Optional[Path]:
        value = config_info.get(env)
        if not value:
            return None
        path = Path(value)
        if not path.is_absolute():
            path = here / value
        return path

    def int_from_int(env: str, default: int) -> int:
        value = config_info.get(env)
        if not value:
            return default
        return int(value)

    config = Config()
    config.minor_version = int_from_int("MINOR_VERSION", 1)
    config.swig_patch_enabled = not args.disable_swig_patch
    config.this_path = here
    config.rdkit_path = path_from_ini("RDKIT_DIR")
    if get_os() == "win":
        # These pathes are only for Windows.
        config.boost_path = path_from_ini("BOOST_DIR")
        config.zlib_path = path_from_ini("ZLIB_DIR")
        config.libpng_path = path_from_ini("LIBPNG_DIR")
        config.pixman_path = path_from_ini("PIXMAN_DIR")
        config.freetype_path = path_from_ini("FREETYPE_DIR")
        config.cairo_path = path_from_ini("CAIRO_DIR")
    config.eigen_path = path_from_ini("EIGEN_DIR")
    config.cairo_support = True
    config.test_enabled = False
    return config


if __name__ == "__main__":
    main()