#!/usr/bin/env python3

#
#    Helper module to build macOS version of various source ports
#    Copyright (C) 2020 Alexey Lysiuk
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

import sys

if sys.hexversion < 0x3070000:
    print('Build module requires Python 3.7 or newer')
    exit(1)

import argparse
import collections
import hashlib
import os
import re
import shutil
import subprocess
import typing
import urllib.request
import zipapp


class CommandLineOptions(dict):
    # Rules to combine argument's name and value
    MAKE_RULES = 0
    CMAKE_RULES = 1

    def to_list(self, rules=MAKE_RULES) -> list:
        result = []

        for arg_name, arg_value in self.items():
            if rules == CommandLineOptions.MAKE_RULES:
                option = arg_name + ('=' + arg_value if arg_value else '')
            elif rules == CommandLineOptions.CMAKE_RULES:
                arg_value = arg_value if arg_value else ''
                option = f'-D{arg_name}={arg_value}'
            else:
                assert False, 'Unknown argument rules'

            result.append(option)

        return result


class BaseTarget:
    def __init__(self, name=None):
        self.name = name

    def prepare_source(self, builder: 'Builder'):
        pass

    def initialize(self, builder: 'Builder'):
        pass

    def detect(self, builder: 'Builder') -> bool:
        return False

    def configure(self, builder: 'Builder'):
        pass

    def build(self, builder: 'Builder'):
        pass

    def post_build(self, builder: 'Builder'):
        pass


class Target(BaseTarget):
    def __init__(self, name=None):
        super().__init__(name)

        self.src_root = ''
        self.prefix = None
        self.environment = os.environ
        self.options = CommandLineOptions()

    def initialize(self, builder: 'Builder'):
        self.prefix = builder.deps_path + self.name

    def configure(self, builder: 'Builder'):
        os.makedirs(builder.build_path, exist_ok=True)

        self.environment['PATH'] = self.environment['PATH'] \
            + os.pathsep + '/Applications/CMake.app/Contents/bin' \
            + os.pathsep + builder.bin_path

        for prefix in ('CPP', 'C', 'CXX', 'OBJC', 'OBJCXX'):
            varname = f'{prefix}FLAGS'

            self._update_env(varname, f'-I{builder.include_path}')
            self._set_sdk(builder, varname)
            self._set_os_version(builder, varname)

        ldflags = 'LDFLAGS'
        self._update_env(ldflags, f'-L{builder.lib_path}')
        self._set_sdk(builder, ldflags)
        self._set_os_version(builder, ldflags)

    def _update_env(self, name: str, value: str):
        env = self.environment
        env[name] = env[name] + ' ' + value if name in env else value

    def _set_sdk(self, builder: 'Builder', varname: str):
        if builder.sdk_path:
            self._update_env(varname, f'-isysroot {builder.sdk_path}')

    def _set_os_version(self, builder: 'Builder', varname: str):
        if builder.os_version:
            self._update_env(varname, f'-mmacosx-version-min={builder.os_version}')

    def install(self, builder: 'Builder', options: 'CommandLineOptions' = None, tool: str = 'make'):
        if builder.xcode:
            return

        if os.path.exists(self.prefix):
            shutil.rmtree(self.prefix)

        args = [tool, 'install']
        args += options and options.to_list() or []

        work_path = builder.build_path + self.src_root
        subprocess.check_call(args, cwd=work_path)

        self.update_pc_files(builder)

    @staticmethod
    def update_pc_file(path: str, processor: typing.Callable = None):
        with open(path, 'r') as f:
            content = f.readlines()

        patched_content = []
        prefix = 'prefix='

        for line in content:
            patched_line = line

            if line.startswith(prefix):
                # Clear prefix variable
                patched_line = prefix + os.linesep

            if processor:
                patched_line = processor(path, patched_line)

                if not patched_line:
                    continue

            patched_content.append(patched_line)

        with open(path, 'w') as f:
            f.writelines(patched_content)

    def update_pc_files(self, builder: 'Builder'):
        for root, _, files in os.walk(builder.deps_path + self.name, followlinks=True):
            for filename in files:
                if filename.endswith('.pc'):
                    file_path = root + os.sep + filename
                    Target.update_pc_file(file_path, self._process_pkg_config)

    @staticmethod
    def _process_pkg_config(pcfile: str, line: str) -> str:
        assert pcfile
        return line


class MakeTarget(Target):
    def __init__(self, name=None):
        super().__init__(name)
        self.makefile = 'Makefile'

    def configure(self, builder: 'Builder'):
        super().configure(builder)

        Builder.symlink_directory(builder.source_path, builder.build_path)

    def build(self, builder: 'Builder'):
        assert not builder.xcode

        args = [
            'make',
            '-f', self.makefile,
            '-j', builder.jobs,
        ]
        args += self.options.to_list()

        work_path = builder.build_path + self.src_root
        subprocess.check_call(args, cwd=work_path, env=self.environment)


class ConfigureMakeTarget(Target):
    def __init__(self, name=None):
        super().__init__(name)
        self.make = MakeTarget(name)

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self.options['--prefix'] = self.prefix

        self.make.initialize(builder)

    def configure(self, builder: 'Builder'):
        super().configure(builder)
        self.make.configure(builder)

        work_path = builder.build_path + self.src_root
        args = [work_path + os.sep + 'configure']
        args += self.options.to_list()
        subprocess.check_call(args, cwd=work_path, env=self.environment)

    def build(self, builder: 'Builder'):
        assert not builder.xcode
        self.make.build(builder)


class ConfigureMakeDependencyTarget(ConfigureMakeTarget):
    def __init__(self, name=None):
        super().__init__(name)

    def post_build(self, builder: 'Builder'):
        self.install(builder)


class ConfigureMakeStaticDependencyTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name=None):
        super().__init__(name)
        self.options['--enable-shared'] = 'no'


class CMakeTarget(Target):
    def __init__(self, name=None):
        super().__init__(name)

    def detect(self, builder: 'Builder') -> bool:
        src_root = self.src_root and os.sep + self.src_root or ''
        cmakelists_path = builder.source_path + src_root + os.sep + 'CMakeLists.txt'

        if not os.path.exists(cmakelists_path):
            return False

        for line in open(cmakelists_path).readlines():
            project_name = CMakeTarget._extract_project_name(line)
            if project_name:
                project_name = project_name.lower()
                project_name = project_name.replace(' ', '-')
                break
        else:
            return False

        return project_name == self.name

    @staticmethod
    def _extract_project_name(line: str):
        project_name = None

        # Try to get project name without whitespaces in it
        match = re.search(r'project\s*\(\s*(\w[\w-]+)', line, re.IGNORECASE)

        if not match:
            # Try to get project name that contains whitespaces
            match = re.search(r'project\s*\(\s*"?(\w[\s\w-]+)"?', line, re.IGNORECASE)

        if match:
            project_name = match.group(1)

        return project_name

    def configure(self, builder: 'Builder'):
        super().configure(builder)

        args = [
            'cmake',
            builder.xcode and '-GXcode' or '-GUnix Makefiles',
            '-DCMAKE_BUILD_TYPE=Release',
            '-DCMAKE_INSTALL_PREFIX=' + self.prefix,
            '-DCMAKE_PREFIX_PATH=' + builder.prefix_path,
            '-DCMAKE_OSX_DEPLOYMENT_TARGET=' + builder.os_version,
        ]

        if builder.sdk_path:
            args.append('-DCMAKE_OSX_SYSROOT=' + builder.sdk_path)

        args += self.options.to_list(CommandLineOptions.CMAKE_RULES)
        args.append(builder.source_path + self.src_root)

        subprocess.check_call(args, cwd=builder.build_path, env=self.environment)

    def _link_with_sound_libraries(self, builder: 'Builder'):
        extra_libs = (
            'mpg123',

            # FluidSynth with dependencies
            'fluidsynth',
            'instpatch-1.0',
            'glib-2.0',
            'gobject-2.0',
            'intl',
            'iconv',
            'ffi',
            'pcre',

            # Sndfile with dependencies
            'sndfile',
            'ogg',
            'vorbis',
            'vorbisenc',
            'FLAC',
            'opus',
        )

        linker_args = '-framework AudioUnit -framework AudioToolbox -framework Carbon ' \
                      '-framework CoreAudio -framework CoreMIDI -framework CoreVideo'

        for lib in extra_libs:
            linker_args += f' {builder.lib_path}lib{lib}.a'

        self.options['CMAKE_EXE_LINKER_FLAGS'] = linker_args

    def build(self, builder: 'Builder'):
        if builder.xcode:
            # TODO: support case-sensitive file system
            args = ('open', self.name + '.xcodeproj')
        else:
            args = ['make', '-j', builder.jobs]

            if builder.verbose:
                args.append('VERBOSE=1')

        subprocess.check_call(args, cwd=builder.build_path)


class CMakeStaticDependencyTarget(CMakeTarget):
    def __init__(self, name=None):
        super().__init__(name)

        # Set commonly used variables for static libraries
        opts = self.options
        opts['BUILD_SHARED_LIBS'] = 'NO'
        opts['ENABLE_SHARED'] = 'NO'
        opts['LIBTYPE'] = 'STATIC'

    def post_build(self, builder: 'Builder'):
        self.install(builder)


class ZDoomBaseTarget(CMakeTarget):
    def __init__(self, name=None):
        super().__init__(name)

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        opts = self.options
        opts['PK3_QUIET_ZIPDIR'] = 'YES'
        opts['DYN_OPENAL'] = 'NO'
        # Explicit OpenAL configuration to avoid selection of Apple's framework
        opts['OPENAL_INCLUDE_DIR'] = builder.include_path + 'AL'
        opts['OPENAL_LIBRARY'] = builder.lib_path + 'libopenal.a'


class GZDoomTarget(ZDoomBaseTarget):
    def __init__(self, name='gzdoom'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/coelckers/gzdoom.git')

    def post_build(self, builder: 'Builder'):
        # Put MoltenVK library into application bundle
        molten_lib = 'libMoltenVK.dylib'
        src_path = builder.lib_path + molten_lib
        dst_path = builder.build_path

        if builder.xcode:
            # TODO: Support other configurations
            dst_path += 'Debug' + os.sep

        dst_path += self.name + '.app/Contents/MacOS' + os.sep
        os.makedirs(dst_path, exist_ok=True)

        dst_path += molten_lib

        if not os.path.exists(dst_path):
            copy_func = builder.xcode and os.symlink or shutil.copy
            copy_func(src_path, dst_path)


class QZDoomTarget(GZDoomTarget):
    def __init__(self, name='qzdoom'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/madame-rachelle/qzdoom.git')


class LZDoomTarget(ZDoomBaseTarget):
    def __init__(self, name='lzdoom'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/drfrag666/gzdoom.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)

        opts = self.options
        opts['DYN_FLUIDSYNTH'] = 'NO'
        opts['DYN_MPG123'] = 'NO'
        opts['DYN_SNDFILE'] = 'NO'


class RazeTarget(ZDoomBaseTarget):
    def __init__(self, name='raze'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/coelckers/Raze.git')


class AccTarget(CMakeTarget):
    def __init__(self, name='acc'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/rheit/acc.git')


class PrBoomPlusTarget(CMakeTarget):
    def __init__(self, name='prboom-plus'):
        super().__init__(name)
        self.src_root = 'prboom2'

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/coelckers/prboom-plus.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        extra_linker_args = ' -framework ForceFeedback -framework IOKit'

        extra_libs = (
            'mikmod',
            'modplug',
            'opusfile',
            'webp',
        )

        for lib in extra_libs:
            extra_linker_args += f' {builder.lib_path}lib{lib}.a'

        opts = self.options
        opts['CMAKE_C_FLAGS'] = '-D_FILE_OFFSET_BITS=64'
        opts['CMAKE_EXE_LINKER_FLAGS'] += extra_linker_args
        opts['CMAKE_POLICY_DEFAULT_CMP0056'] = 'NEW'


class ChocolateDoomTarget(CMakeTarget):
    def __init__(self, name='chocolate-doom'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/chocolate-doom/chocolate-doom.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        extra_linker_args = ' -lc++ -framework Cocoa -framework ForceFeedback -framework IOKit'

        extra_libs = (
            'mikmod',
            'modplug',
            'opusfile',
            'vorbisfile',
        )

        for lib in extra_libs:
            extra_linker_args += f' {builder.lib_path}lib{lib}.a'

        sdl2_include_dir = builder.include_path + 'SDL2'

        opts = self.options
        opts['SDL2_INCLUDE_DIR'] = sdl2_include_dir
        opts['SDL2_LIBRARY'] = builder.lib_path + 'libSDL2.a'
        opts['SDL2_MIXER_INCLUDE_DIR'] = sdl2_include_dir
        opts['SDL2_MIXER_LIBRARY'] = builder.lib_path + 'libSDL2_mixer.a'
        opts['SDL2_NET_INCLUDE_DIR'] = sdl2_include_dir
        opts['SDL2_NET_LIBRARY'] = builder.lib_path + 'libSDL2_net.a'
        opts['CMAKE_EXE_LINKER_FLAGS'] += extra_linker_args


class CrispyDoomTarget(ChocolateDoomTarget):
    def __init__(self, name='crispy-doom'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/fabiangreffrath/crispy-doom.git')


class DoomRetroTarget(CMakeTarget):
    def __init__(self, name='doomretro'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/bradharding/doomretro.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        extra_linker_args = ' -lc++ -framework Cocoa -framework ForceFeedback -framework IOKit'

        extra_libs = (
            'mikmod',
            'modplug',
            'opusfile',
            'vorbisfile',
            'webp'
        )

        for lib in extra_libs:
            extra_linker_args += f' {builder.lib_path}lib{lib}.a'

        sdl2_include_dir = builder.include_path + 'SDL2'

        opts = self.options
        opts['SDL2_INCLUDE_DIRS'] = sdl2_include_dir
        opts['SDL2_LIBRARIES'] = builder.lib_path + 'libSDL2.a'
        opts['SDL2_FOUND'] = 'YES'
        opts['SDL2_IMAGE_INCLUDE_DIRS'] = sdl2_include_dir
        opts['SDL2_IMAGE_LIBRARIES'] = builder.lib_path + 'libSDL2_image.a'
        opts['SDL2_IMAGE_FOUND'] = 'YES'
        opts['SDL2_MIXER_INCLUDE_DIRS'] = sdl2_include_dir
        opts['SDL2_MIXER_LIBRARIES'] = builder.lib_path + 'libSDL2_mixer.a'
        opts['SDL2_MIXER_FOUND'] = 'YES'
        opts['CMAKE_EXE_LINKER_FLAGS'] += extra_linker_args


class Doom64EXTarget(CMakeTarget):
    def __init__(self, name='doom64ex'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/svkaiser/Doom64EX.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        opts = self.options
        opts['ENABLE_SYSTEM_FLUIDSYNTH'] = 'YES'
        opts['CMAKE_EXE_LINKER_FLAGS'] += ' -framework Cocoa -framework ForceFeedback -framework IOKit'


class DevilutionXTarget(CMakeTarget):
    def __init__(self, name='devilutionx'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://github.com/diasurgical/devilutionX.git')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)
        self._link_with_sound_libraries(builder)

        extra_linker_args = ' -framework Cocoa -framework ForceFeedback -framework IOKit'

        extra_libs = (
            'bz2',
            'freetype',
            'mikmod',
            'modplug',
            'opusfile',
            'png',
            'vorbisfile',
            'z',
        )

        for lib in extra_libs:
            extra_linker_args += f' {builder.lib_path}lib{lib}.a'

        opts = self.options
        opts['CMAKE_EXE_LINKER_FLAGS'] += extra_linker_args


class QuakespasmTarget(MakeTarget):
    def __init__(self, name='quakespasm'):
        super().__init__(name)
        self.src_root = 'Quake'

    def prepare_source(self, builder: 'Builder'):
        builder.checkout_git('https://git.code.sf.net/p/quakespasm/quakespasm')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + os.sep + 'Quakespasm.txt')

    def initialize(self, builder: 'Builder'):
        super().initialize(builder)

        # TODO: Use macOS specific Makefile which requires manual application bundle creation
        opts = self.options
        opts['USE_SDL2'] = '1'
        opts['USE_CODEC_FLAC'] = '1'
        opts['USE_CODEC_OPUS'] = '1'
        opts['USE_CODEC_MIKMOD'] = '1'
        opts['USE_CODEC_UMX'] = '1'
        # TODO: Setup sdl2-config
        opts['SDL_CFLAGS'] = f'-I{builder.include_path}SDL2'
        opts['SDL_LIBS'] = f'{builder.lib_path}libSDL2.a'
        opts['COMMON_LIBS'] = '-framework AudioToolbox -framework Carbon -framework Cocoa -framework CoreAudio' \
            ' -framework CoreVideo -framework ForceFeedback -framework IOKit -framework OpenGL'

        self._update_env('CFLAGS', f'-I{builder.include_path}opus')
        # Use main() alias to workaround executable linking without macOS launcher
        self._update_env('LDFLAGS', f'-Wl,-alias -Wl,_SDL_main -Wl,_main')

        for name in ('opus', 'opusfile'):
            self._update_env('LDFLAGS', f'{builder.lib_path}lib{name}.a')

        # TODO: Specify full paths for remaining libraries

    def configure(self, builder: 'Builder'):
        super().configure(builder)

        # Copy linker flags from environment to command line argument, they would be overridden by Makefile otherwise
        ldflags = 'LDFLAGS'
        self.options[ldflags] = self.environment[ldflags]


class Bzip2Target(MakeTarget):
    def __init__(self, name='bzip2'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz',
            'ab5a03176ee106d3f0fa90e381da478ddae405918153cca248e682cd0c4a2269')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'bzlib.h')

    def configure(self, builder: 'Builder'):
        super().configure(builder)

        # Copy compiler flags from environment to command line argument, they would be overridden by Makefile otherwise
        cflags = 'CFLAGS'
        self.options[cflags] = self.environment[cflags] + ' -D_FILE_OFFSET_BITS=64 -O2'

    def post_build(self, builder: 'Builder'):
        self.options['PREFIX'] = self.prefix
        self.install(builder, self.options)


class FfiTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='ffi'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/libffi/libffi/releases/download/v3.3/libffi-3.3.tar.gz',
            '72fba7922703ddfa7a028d513ac15a85c8d54c8d67f55fa5a4802885dc652056')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'libffi.pc.in')


class FlacTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='flac'):
        super().__init__(name)
        self.options['--enable-cpplibs'] = 'no'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://downloads.xiph.org/releases/flac/flac-1.3.3.tar.xz',
            '213e82bd716c9de6db2f98bcadbc4c24c7e2efe8c75939a1a84e28539c4e1748')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'FLAC/flac.pc.in')


class FluidSynthTarget(CMakeStaticDependencyTarget):
    def __init__(self, name='fluidsynth'):
        super().__init__(name)

        opts = self.options
        opts['LIB_SUFFIX'] = None
        opts['enable-framework'] = 'NO'
        opts['enable-readline'] = 'NO'
        opts['enable-sdl2'] = 'NO'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/FluidSynth/fluidsynth/archive/v2.1.5.tar.gz',
            'b539b7c65a650b56f01cd60a4e83c6125c217c5a63c0c214ef6274894a677d00')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'fluidsynth.pc.in')

    @staticmethod
    def _process_pkg_config(pcfile: str, line: str) -> str:
        if line.startswith('Version:'):
            # Add instpatch as private dependency which pulls all necessary libraries
            return line + 'Requires.private: libinstpatch-1.0' + os.linesep

        return line


class GettextTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='gettext'):
        super().__init__(name)

        opts = self.options
        opts['--enable-csharp'] = 'no'
        opts['--enable-java'] = 'no'
        opts['--enable-libasprintf'] = 'no'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://ftp.gnu.org/gnu/gettext/gettext-0.21.tar.xz',
            'd20fcbb537e02dcf1383197ba05bd0734ef7bf5db06bdb241eb69b7d16b73192')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'gettext-runtime')


class GlibTarget(Target):
    def __init__(self, name='glib'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://download.gnome.org/sources/glib/2.66/glib-2.66.3.tar.xz',
            '79f31365a99cb1cc9db028625635d1438890702acde9e2802eae0acebcf7b5b1')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'glib.doap')

    def configure(self, builder: 'Builder'):
        super().configure(builder)

        environment = self.environment
        environment['LDFLAGS'] += ' -framework CoreFoundation'

        args = (
            builder.bin_path + 'meson',
            '--prefix=' + builder.deps_path + self.name,
            '--buildtype=release',
            '--default-library=static',
            builder.source_path
        )
        subprocess.check_call(args, cwd=builder.build_path, env=environment)

    def build(self, builder: 'Builder'):
        args = ('ninja',)
        subprocess.check_call(args, cwd=builder.build_path, env=self.environment)

    def post_build(self, builder: 'Builder'):
        self.install(builder, tool='ninja')


class IconvTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='iconv'):
        super().__init__(name)
        self.options['--enable-extra-encodings'] = 'yes'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://ftp.gnu.org/gnu/libiconv/libiconv-1.16.tar.gz',
            'e6a1b1b589654277ee790cce3734f07876ac4ccfaecbee8afa0b649cf529cc04')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'include/iconv.h.in')


class InstPatchTarget(CMakeStaticDependencyTarget):
    def __init__(self, name='instpatch'):
        super().__init__(name)
        self.options['LIB_SUFFIX'] = None

        # Workaround for missing frameworks in dependencies, no clue what's wrong at the moment
        self.environment['LDFLAGS'] = '-framework CoreFoundation -framework Foundation'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/swami/libinstpatch/archive/v1.1.5.tar.gz',
            '5fd01cd2ba7377e7a72caaf3b565d8fe088b5c8a14e0ea91516f0c87524bcf8a')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'libinstpatch-1.0.pc.in')


class IntlTarget(GettextTarget):
    def __init__(self, name='intl'):
        super().__init__(name)
        self.src_root = 'gettext-runtime'
        self.make.src_root += self.src_root + os.sep + 'intl'

    def post_build(self, builder: 'Builder'):
        # Do install of intl only, avoid complete gettext runtime
        self.src_root = self.make.src_root
        self.install(builder)


class JpegTurboTarget(CMakeStaticDependencyTarget):
    def __init__(self, name='jpeg-turbo'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://downloads.sourceforge.net/project/libjpeg-turbo/2.0.6/libjpeg-turbo-2.0.6.tar.gz',
            'd74b92ac33b0e3657123ddcf6728788c90dc84dcb6a52013d758af3c4af481bb')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'turbojpeg.h')


class MesonTarget(Target):
    def __init__(self, name='meson'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/mesonbuild/meson/releases/download/0.56.0/meson-0.56.0.tar.gz',
            '291dd38ff1cd55fcfca8fc985181dd39be0d3e5826e5f0013bf867be40117213')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'meson.py')

    def post_build(self, builder: 'Builder'):
        script = '__main__.py'
        shutil.copy(builder.source_path + script, builder.build_path)

        module = 'mesonbuild'
        module_path = builder.build_path + module
        if os.path.exists(module_path):
            shutil.rmtree(module_path)
        shutil.copytree(builder.source_path + module, module_path)

        dest_path = builder.deps_path + self.name + os.sep + 'bin' + os.sep
        os.makedirs(dest_path, exist_ok=True)

        zipapp.create_archive(builder.build_path, dest_path + self.name, '/usr/bin/env python3', compressed=True)


class MoltenVKTarget(MakeTarget):
    def __init__(self, name='moltenvk'):
        super().__init__(name)
        self.options['macos'] = None

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/KhronosGroup/MoltenVK/archive/v1.1.1.tar.gz',
            'cd1712c571d4155f4143c435c8551a5cb8cbb311ad7fff03595322ab971682c0')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'MoltenVKPackaging.xcodeproj')

    def configure(self, builder: 'Builder'):
        # Do not use specified macOS deployment target and SDK
        # MoltenVK defines minimal OS version itself, and usually, it requires the very recent SDK
        builder.os_version = None
        builder.sdk_path = None

        super().configure(builder)

    def build(self, builder: 'Builder'):
        args = ('./fetchDependencies', '--macos', '-v')
        subprocess.check_call(args, cwd=builder.build_path)

        super().build(builder)

    def post_build(self, builder: 'Builder'):
        if builder.xcode:
            return

        if os.path.exists(self.prefix):
            shutil.rmtree(self.prefix)

        lib_path = self.prefix + os.sep + 'lib' + os.sep
        os.makedirs(lib_path)

        src_path = builder.build_path + 'Package/Latest/MoltenVK/'
        shutil.copytree(src_path + 'include', self.prefix + os.sep + 'include')
        shutil.copy(builder.build_path + 'LICENSE', self.prefix + os.sep + 'apache2.txt')

        # TODO: Replace lipo with the following line when ARM64 support will be ready
        # shutil.copy(src_path + 'dylib/macOS/libMoltenVK.dylib', lib_path)
        dylib_name = 'libMoltenVK.dylib'
        args = (
            'lipo',
            f'{src_path}dylib/macOS/{dylib_name}',
            '-thin', 'x86_64',
            '-output', lib_path + dylib_name
        )
        subprocess.check_call(args)


class Mpg123Target(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='mpg123'):
        super().__init__(name)
        self.options['--enable-modules'] = 'no'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://www.mpg123.de/download/mpg123-1.26.3.tar.bz2',
            '30c998785a898f2846deefc4d17d6e4683a5a550b7eacf6ea506e30a7a736c6e')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'libmpg123.pc.in')


class NasmTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name='nasm'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://www.nasm.us/pub/nasm/releasebuilds/2.15.05/nasm-2.15.05.tar.xz',
            '3caf6729c1073bf96629b57cee31eeb54f4f8129b01902c73428836550b30a3f')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'nasm.txt')


class NinjaTarget(MakeTarget):
    def __init__(self, name='ninja'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/ninja-build/ninja/archive/v1.10.2.tar.gz',
            'ce35865411f0490368a8fc383f29071de6690cbadc27704734978221f25e2bed')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'src/ninja.cc')

    def build(self, builder: 'Builder'):
        args = ('python3', './configure.py', '--bootstrap', '--verbose')
        subprocess.check_call(args, cwd=builder.build_path)

    def post_build(self, builder: 'Builder'):
        dest_path = builder.deps_path + self.name + os.sep + 'bin'
        os.makedirs(dest_path, exist_ok=True)
        shutil.copy(builder.build_path + self.name, dest_path)


class OggTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='ogg'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://downloads.xiph.org/releases/ogg/libogg-1.3.4.tar.gz',
            'fe5670640bd49e828d64d2879c31cb4dde9758681bb664f9bdbf159a01b0c76e')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'ogg.pc.in')


class OpenALTarget(CMakeStaticDependencyTarget):
    def __init__(self, name='openal'):
        super().__init__(name)

        opts = self.options
        opts['ALSOFT_EXAMPLES'] = 'NO'
        opts['ALSOFT_UTILS'] = 'NO'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://openal-soft.org/openal-releases/openal-soft-1.21.0.tar.bz2',
            '2916b4fc24e23b0271ce0b3468832ad8b6d8441b1830215b28cc4fee6cc89297')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'openal.pc.in')

    @staticmethod
    def _process_pkg_config(pcfile: str, line: str) -> str:
        libs_private = 'Libs.private:'

        if line.startswith(libs_private):
            # Fix full paths to OS frameworks
            return libs_private + ' -framework ApplicationServices -framework AudioToolbox'\
                                  ' -framework AudioUnit -framework CoreAudio' + os.linesep
        else:
            return line


class OpusTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='opus'):
        super().__init__(name)
        self.options['--disable-extra-programs'] = None

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://archive.mozilla.org/pub/opus/opus-1.3.1.tar.gz',
            '65b58e1e25b2a114157014736a3d9dfeaad8d41be1c8179866f144a2fb44ff9d')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'opus.pc.in')


class OpusFileTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='opusfile'):
        super().__init__(name)
        self.options['--enable-http'] = 'no'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://downloads.xiph.org/releases/opus/opusfile-0.12.tar.gz',
            '118d8601c12dd6a44f52423e68ca9083cc9f2bfe72da7a8c1acb22a80ae3550b')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'opusfile.pc.in')


class PcreTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='pcre'):
        super().__init__(name)

        opts = self.options
        opts['--enable-unicode-properties'] = 'yes'
        opts['--enable-cpp'] = 'no'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://ftp.pcre.org/pub/pcre/pcre-8.44.tar.bz2',
            '19108658b23b3ec5058edc9f66ac545ea19f9537234be1ec62b714c84399366d')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'pcre.h.in')


class PkgConfigTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name='pkg-config'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://pkg-config.freedesktop.org/releases/pkg-config-0.29.2.tar.gz',
            '6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'pkg-config.1')

    def post_build(self, builder: 'Builder'):
        src_path = builder.build_path + 'pkg-config'
        dst_path = builder.deps_path + self.name + os.sep + 'bin' + os.sep + 'pkg-config.exe'
        shutil.copy(src_path, dst_path)


class SndFileTarget(CMakeStaticDependencyTarget):
    def __init__(self, name='sndfile'):
        super().__init__(name)

        opts = self.options
        opts['BUILD_REGTEST'] = 'NO'
        opts['BUILD_TESTING'] = 'NO'

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/libsndfile/libsndfile/releases/download/v1.0.30/libsndfile-1.0.30.tar.bz2',
            '9df273302c4fa160567f412e10cc4f76666b66281e7ba48370fb544e87e4611a')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'sndfile.pc.in')


class VorbisTarget(ConfigureMakeStaticDependencyTarget):
    def __init__(self, name='vorbis'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://downloads.xiph.org/releases/vorbis/libvorbis-1.3.7.tar.xz',
            'b33cc4934322bcbf6efcbacf49e3ca01aadbea4114ec9589d1b1e9d20f72954b')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'vorbis.pc.in')


class VpxTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name='vpx'):
        super().__init__(name)

        opts = self.options
        opts['--disable-examples'] = None
        opts['--disable-unit-tests'] = None

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://github.com/webmproject/libvpx/archive/v1.9.0.tar.gz',
            'd279c10e4b9316bf11a570ba16c3d55791e1ad6faa4404c67422eb631782c80a')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'vpxstats.h')


class YasmTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name='yasm'):
        super().__init__(name)

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz',
            '3dce6601b495f5b3d45b59f7d2492a340ee7e84b5beca17e48f862502bd5603f')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'libyasm.h')


class ZlibTarget(ConfigureMakeDependencyTarget):
    def __init__(self, name='zlib'):
        super().__init__(name)
        self.options['--static'] = None

    def prepare_source(self, builder: 'Builder'):
        builder.download_source(
            'https://zlib.net/zlib-1.2.11.tar.gz',
            'c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1')

    def detect(self, builder: 'Builder') -> bool:
        return os.path.exists(builder.source_path + 'zlib.pc.in')


class CleanTarget(BaseTarget):
    def __init__(self, name=None):
        super().__init__(name)
        self.args = ()

    def build(self, builder: 'Builder'):
        args = ('git', 'clean') + self.args
        subprocess.check_call(args, cwd=builder.root_path)


class CleanAllTarget(CleanTarget):
    def __init__(self, name='clean-all'):
        super().__init__(name)
        self.args = ('-dX', '--force')


class CleanDepsTarget(CleanAllTarget):
    def __init__(self, name='clean-deps'):
        super().__init__(name)

    def configure(self, builder: 'Builder'):
        self.args += (builder.deps_path,)


# Case insensitive dictionary class from
# https://github.com/psf/requests/blob/v2.25.0/requests/structures.py

class CaseInsensitiveDict(collections.abc.MutableMapping):
    """A case-insensitive ``dict``-like object.
    Implements all methods and operations of
    ``MutableMapping`` as well as dict's ``copy``. Also
    provides ``lower_items``.
    All keys are expected to be strings. The structure remembers the
    case of the last key to be set, and ``iter(instance)``,
    ``keys()``, ``items()``, ``iterkeys()``, and ``iteritems()``
    will contain case-sensitive keys. However, querying and contains
    testing is case insensitive::
        cid = CaseInsensitiveDict()
        cid['Accept'] = 'application/json'
        cid['aCCEPT'] == 'application/json'  # True
        list(cid) == ['Accept']  # True
    For example, ``headers['content-encoding']`` will return the
    value of a ``'Content-Encoding'`` response header, regardless
    of how the header name was originally stored.
    If the constructor, ``.update``, or equality comparison
    operations are given keys that have equal ``.lower()``s, the
    behavior is undefined.
    """

    def __init__(self, data=None, **kwargs):
        self._store = collections.OrderedDict()
        if data is None:
            data = {}
        self.update(data, **kwargs)

    def __setitem__(self, key, value):
        # Use the lowercased key for lookups, but store the actual
        # key alongside the value.
        self._store[key.lower()] = (key, value)

    def __getitem__(self, key):
        return self._store[key.lower()][1]

    def __delitem__(self, key):
        del self._store[key.lower()]

    def __iter__(self):
        return (casedkey for casedkey, mappedvalue in self._store.values())

    def __len__(self):
        return len(self._store)

    def lower_items(self):
        """Like iteritems(), but with all lowercase keys."""
        return (
            (lowerkey, keyval[1])
            for (lowerkey, keyval)
            in self._store.items()
        )

    def __eq__(self, other):
        if isinstance(other, collections.abc.Mapping):
            other = CaseInsensitiveDict(other)
        else:
            return NotImplemented
        # Compare insensitively
        return dict(self.lower_items()) == dict(other.lower_items())

    # Copy is required
    def copy(self):
        return CaseInsensitiveDict(self._store.values())

    def __repr__(self):
        return str(dict(self.items()))


class Builder(object):
    def __init__(self, args: list):
        self._create_targets()

        self.root_path = os.path.dirname(os.path.abspath(__file__)) + os.sep
        self.deps_path = self.root_path + 'deps' + os.sep
        self.prefix_path = self.root_path + 'prefix' + os.sep
        self.bin_path = self.prefix_path + 'bin' + os.sep
        self.include_path = self.prefix_path + 'include' + os.sep
        self.lib_path = self.prefix_path + 'lib' + os.sep
        self.root_source_path = self.root_path + 'source' + os.sep
        self.patch_path = self.root_path + 'patch' + os.sep

        arguments = self._parse_arguments(args)

        self.xcode = arguments.xcode
        self.checkout_commit = arguments.checkout_commit
        self.build_path = arguments.build_path
        self.sdk_path = arguments.sdk_path
        self.os_version = arguments.os_version
        self.verbose = arguments.verbose

        if arguments.target:
            self.target = self.targets[arguments.target]
            self.source_path = self.root_source_path + self.target.name
        else:
            assert arguments.source_path
            self.source_path = arguments.source_path
            self._detect_target()

        if not self.build_path:
            self.build_path = self.root_path + 'build' + os.sep + self.target.name + \
                os.sep + (self.xcode and 'xcode' or 'make')

        self.source_path += os.sep
        self.build_path += os.sep

        self.jobs = arguments.jobs and arguments.jobs or \
            subprocess.check_output(['sysctl', '-n', 'hw.ncpu']).decode('ascii').strip()

        if not self.sdk_path:
            sdk_probe_path = f'{self.root_path}sdk{os.sep}MacOSX{self.os_version}.sdk'
            if os.path.exists(sdk_probe_path):
                self.sdk_path = sdk_probe_path

        self.target.initialize(self)

    def run(self):
        self._create_prefix_directory()

        target = self.target
        target.prepare_source(self)
        target.configure(self)
        target.build(self)
        target.post_build(self)

    def _create_prefix_directory(self):
        os.makedirs(self.prefix_path, exist_ok=True)

        cleanup = True

        for dep in os.scandir(self.deps_path):
            Builder.symlink_directory(dep.path, self.prefix_path, cleanup)

            # Do symlink cleanup only once
            cleanup = False

    @staticmethod
    def symlink_directory(src_path: str, dst_path: str, cleanup=True):
        src_abspath = os.path.abspath(src_path)
        dst_abspath = os.path.abspath(dst_path)

        if cleanup:
            # Delete obsolete symbolic links
            for root, _, files in os.walk(dst_abspath, followlinks=True):
                for filename in files:
                    file_path = root + os.sep + filename

                    if os.path.islink(file_path) and not os.path.exists(file_path):
                        os.remove(file_path)

        # Create symbolic links if needed
        for entry in os.scandir(src_abspath):
            dst_subpath = entry.path.replace(src_abspath, dst_abspath)
            if entry.is_dir():
                os.makedirs(dst_subpath, exist_ok=True)
                Builder.symlink_directory(entry.path, dst_subpath, cleanup=False)
            elif not os.path.exists(dst_subpath):
                if os.path.islink(entry.path):
                    shutil.copy(entry.path, dst_subpath, follow_symlinks=False)
                else:
                    os.symlink(entry.path, dst_subpath)

    def _detect_target(self):
        for name, target in self.targets.items():
            if target.detect(self):
                self.target = self.targets[name]
                break

        assert self.target

    def _create_targets(self):
        targets = (
            GZDoomTarget(),
            QZDoomTarget(),
            LZDoomTarget(),
            RazeTarget(),
            AccTarget(),
            PrBoomPlusTarget(),
            ChocolateDoomTarget(),
            CrispyDoomTarget(),
            DoomRetroTarget(),
            Doom64EXTarget(),
            DevilutionXTarget(),
            QuakespasmTarget(),

            # Dependencies
            Bzip2Target(),
            FfiTarget(),
            FlacTarget(),
            FluidSynthTarget(),
            GlibTarget(),
            IconvTarget(),
            InstPatchTarget(),
            IntlTarget(),
            JpegTurboTarget(),
            MesonTarget(),
            MoltenVKTarget(),
            Mpg123Target(),
            NasmTarget(),
            NinjaTarget(),
            OggTarget(),
            OpenALTarget(),
            OpusTarget(),
            OpusFileTarget(),
            PcreTarget(),
            PkgConfigTarget(),
            SndFileTarget(),
            VorbisTarget(),
            VpxTarget(),
            YasmTarget(),
            ZlibTarget(),

            # Special
            CleanAllTarget(),
            CleanDepsTarget()
        )

        self.targets = CaseInsensitiveDict({target.name: target for target in targets})

    def _parse_arguments(self, args: list):
        assert self.targets

        parser = argparse.ArgumentParser(description='*ZDoom binary dependencies for macOS')

        group = parser.add_mutually_exclusive_group(required=True)
        group.add_argument('--target', choices=self.targets.keys(), help='target to build')
        group.add_argument('--source-path', metavar='path', help='path to target\'s source code')

        group = parser.add_argument_group()
        group.add_argument('--xcode', action='store_true', help='generate Xcode project instead of build')
        group.add_argument('--checkout-commit', metavar='commit',
                           help='target\'s source code commit or tag to checkout')
        group.add_argument('--build-path', metavar='path', help='target build path')
        group.add_argument('--sdk-path', metavar='path', help='path to macOS SDK')
        group.add_argument('--os-version', metavar='version', default='10.9', help='macOS deployment version')
        group.add_argument('--verbose', action='store_true', help='enable verbose build output')
        group.add_argument('--jobs', help='number of parallel compilation jobs')

        return parser.parse_args(args)

    def checkout_git(self, url: str):
        if not os.path.exists(self.source_path):
            args = ('git', 'clone', '--recurse-submodules', url, self.source_path)
            subprocess.check_call(args, cwd=self.root_path)

        if self.checkout_commit:
            args = ['git', 'checkout', self.checkout_commit]
            subprocess.check_call(args, cwd=self.source_path)

    def _read_source_package(self, url: str) -> (bytes, str):
        filename = url.rsplit(os.sep, 1)[1]
        filepath = self.source_path + filename

        if os.path.exists(filepath):
            # Read existing source package
            with open(filepath, 'rb') as f:
                data = f.read()
        else:
            # Download package with source code
            print(f'Downloading {filename}')

            response = urllib.request.urlopen(url)

            try:
                with open(filepath, 'wb') as f:
                    data = response.read()
                    f.write(data)

            except IOError:
                os.unlink(filepath)
                raise

        return data, filepath

    @staticmethod
    def _verify_checksum(checksum: str, data: bytes, filepath: str) -> None:
        file_hasher = hashlib.sha256()
        file_hasher.update(data)
        file_checksum = file_hasher.hexdigest()

        if file_checksum != checksum:
            os.unlink(filepath)
            raise Exception(f'Checksum of {filepath} does not match, expected: {checksum}, actual: {file_checksum}')

    def _unpack_source_package(self, filepath: str) -> (str, str):
        filepaths = subprocess.check_output(['tar', '-tf', filepath]).decode("utf-8")
        filepaths = filepaths.split('\n')
        first_path_component = None

        for path in filepaths:
            if os.sep in path:
                first_path_component = path[:path.find(os.sep)]
                break

        if not first_path_component:
            raise Exception("Failed to figure out source code path for " + filepath)

        extract_path = self.source_path + first_path_component + os.sep

        if not os.path.exists(extract_path):
            # Extract source code package
            try:
                subprocess.check_call(['tar', '-xf', filepath], cwd=self.source_path)
            except (IOError, subprocess.CalledProcessError):
                shutil.rmtree(extract_path, ignore_errors=True)
                raise

        return first_path_component, extract_path

    def _apply_source_patch(self, extract_path: str):
        patch_path = self.patch_path + self.target.name + '.patch'

        if not os.path.exists(patch_path):
            return

        # Check if patch is already applied
        test_arg = '--dry-run'
        args = ['patch', test_arg, '--strip=1', '--input=' + patch_path]

        if subprocess.call(args, cwd=extract_path) == 0:
            # Patch wasn't applied yet, do it now
            args.remove(test_arg)
            subprocess.check_call(args, cwd=extract_path)

    def download_source(self, url: str, checksum: str):
        os.makedirs(self.source_path, exist_ok=True)

        data, filepath = self._read_source_package(url)
        Builder._verify_checksum(checksum, data, filepath)

        first_path_component, extract_path = self._unpack_source_package(filepath)
        self._apply_source_patch(extract_path)

        # Adjust source and build paths according to extracted source code
        self.source_path = extract_path
        self.build_path = self.build_path + first_path_component + os.sep


if __name__ == '__main__':
    Builder(sys.argv[1:]).run()