#     Copyright 2022, Kay Hayen, mailto:kay.hayen@gmail.com
#
#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
#
""" Helper functions for the scons file.

"""

from __future__ import print_function

import os
import shutil
import signal
import sys

from nuitka.__past__ import basestring, unicode
from nuitka.containers.OrderedDicts import OrderedDict
from nuitka.Tracing import scons_details_logger, scons_logger
from nuitka.utils.Execution import executeProcess
from nuitka.utils.FileOperations import getFileContentByLine, openTextFile
from nuitka.utils.Utils import isLinux, isMacOS, isPosixWindows


def initScons():
    # Avoid localized outputs.
    os.environ["LANG"] = "C"

    def no_sync(self):
        # That's a noop, pylint: disable=unused-argument
        pass

    # Avoid scons writing the scons database at all, spell-checker: ignore dblite
    import SCons.dblite  # pylint: disable=I0021,import-error

    SCons.dblite.dblite.sync = no_sync


def setupScons(env, source_dir):
    env["BUILD_DIR"] = source_dir

    # Store the file signatures database with the rest of the source files and
    # make it version dependent on the Python version of running Scons, as its
    # pickle is being used, spell-checker: ignore sconsign
    sconsign_filename = os.path.abspath(
        os.path.join(
            source_dir, ".sconsign-%d%s" % (sys.version_info[0], sys.version_info[1])
        )
    )

    env.SConsignFile(sconsign_filename)


scons_arguments = {}


def setArguments(arguments):
    """Decode command line arguments."""

    arg_encoding = arguments.get("argument_encoding")

    for key, value in arguments.items():
        if arg_encoding is not None:
            value = decodeData(value)
        scons_arguments[key] = value


def getArgumentRequired(name):
    """Helper for string options without default value."""
    return scons_arguments[name]


def getArgumentDefaulted(name, default):
    """Helper for string options with default value."""
    return scons_arguments.get(name, default)


def getArgumentInt(option_name, default=None):
    """Small helper for boolean mode flags."""
    if default is None:
        value = scons_arguments[option_name]
    else:
        value = int(scons_arguments.get(option_name, default))

    return value


def getArgumentBool(option_name, default=None):
    """Small helper for boolean mode flags."""
    if default is None:
        value = scons_arguments[option_name]
    else:
        value = scons_arguments.get(option_name, "True" if default else "False")

    return value.lower() in ("yes", "true", "1")


def getArgumentList(option_name, default=None):
    """Small helper for list mode options, default should be command separated str."""
    if default is None:
        value = scons_arguments[option_name]
    else:
        value = scons_arguments.get(option_name, default)

    if value:
        return value.split(",")
    else:
        return []


def _enableExperimentalSettings(env, experimental_flags):
    for experimental_flag in experimental_flags:
        if experimental_flag:
            if "=" in experimental_flag:
                experiment, value = experimental_flag.split("=", 1)
            else:
                experiment = experimental_flag
                value = None

            # Allowing for nice names on command line, but using identifiers for C.
            experiment = experiment.upper().replace("-", "_").replace(".", "_")

            # Experimental without a value is done as mere define, otherwise
            # the value is passed. spell-checker: ignore cppdefines
            if value:
                env.Append(CPPDEFINES=[("_NUITKA_EXPERIMENTAL_%s" % experiment, value)])
            else:
                env.Append(CPPDEFINES=["_NUITKA_EXPERIMENTAL_%s" % experiment])

    env.experimental_flags = experimental_flags


def prepareEnvironment(mingw_mode):
    # Add environment specified compilers to the PATH variable.
    if "CC" in os.environ:
        scons_details_logger.info("CC='%s'" % os.environ["CC"])

        os.environ["CC"] = os.path.normpath(os.path.expanduser(os.environ["CC"]))

        if os.path.isdir(os.environ["CC"]):
            scons_logger.sysexit(
                "Error, the 'CC' variable must point to file, not directory."
            )

        if os.path.sep in os.environ["CC"]:
            cc_dirname = os.path.dirname(os.environ["CC"])
            if os.path.isdir(cc_dirname):
                addToPATH(None, cc_dirname, prefix=True)

        if win_target and isGccName(os.path.basename(os.environ["CC"])):
            scons_details_logger.info(
                "Environment CC seems to be a gcc, enabling mingw_mode."
            )
            mingw_mode = True
    else:
        anaconda_python = getArgumentBool("anaconda_python", False)

        if isLinux() and anaconda_python:
            python_prefix = getArgumentRequired("python_prefix")
            addToPATH(None, os.path.join(python_prefix, "bin"), prefix=True)

    return mingw_mode


def createEnvironment(mingw_mode, msvc_version, target_arch, experimental):
    from SCons.Script import Environment  # pylint: disable=I0021,import-error

    args = {}

    if msvc_version == "list":
        import SCons.Tool.MSCommon.vc  # pylint: disable=I0021,import-error

        scons_logger.sysexit(
            "Installed MSVC versions are %s."
            % ",".join(repr(v) for v in SCons.Tool.MSCommon.vc.get_installed_vcs()),
        )

    # If we are on Windows, and MinGW is not enforced, lets see if we can
    # find "cl.exe", and if we do, disable automatic scan.
    if (
        os.name == "nt"
        and not mingw_mode
        and msvc_version is None
        and msvc_version != "latest"
        and (getExecutablePath("cl", env=None) is not None)
    ):
        args["MSVC_USE_SCRIPT"] = False

    if mingw_mode or isPosixWindows():
        # Force usage of MinGW64, not using MSVC tools.
        tools = ["mingw"]

        # This code would be running anyway, make it do not thing by monkey patching.
        import SCons.Tool.MSCommon.vc  # pylint: disable=I0021,import-error
        import SCons.Tool.msvc  # pylint: disable=I0021,import-error

        SCons.Tool.MSCommon.vc.msvc_setup_env = lambda *args: None
        SCons.Tool.msvc.msvc_exists = (
            SCons.Tool.MSCommon.vc.msvc_exists
        ) = lambda *args: False
    else:
        # Everything else should use default, that is MSVC tools, but not MinGW64.
        tools = ["default"]

    env = Environment(
        # We want the outside environment to be passed through.
        ENV=os.environ,
        # Extra tools configuration for scons.
        tools=tools,
        # The shared libraries should not be named "lib...", because CPython
        # requires the filename "module_name.so/pyd" to load it, with no
        # prefix at all, spell-checker: ignore SHLIBPREFIX
        SHLIBPREFIX="",
        # Under windows, specify the target architecture is needed for Scons
        # to pick up MSVC.
        TARGET_ARCH=target_arch,
        # The MSVC version might be fixed by the user.
        MSVC_VERSION=msvc_version if msvc_version != "latest" else None,
        **args
    )

    # Various flavors could influence builds.
    env.nuitka_python = getArgumentBool("nuitka_python", False)
    env.debian_python = getArgumentBool("debian_python", False)
    env.fedora_python = getArgumentBool("fedora_python", False)
    env.msys2_mingw_python = getArgumentBool("msys2_mingw_python", False)
    env.anaconda_python = getArgumentBool("anaconda_python", False)
    env.pyenv_python = getArgumentBool("pyenv_python", False)
    env.apple_python = getArgumentBool("apple_python", False)

    # Non-elf binary, important for linker settings.
    env.noelf_mode = getArgumentBool("noelf_mode", False)

    # Python specific modes have to influence some decisions.
    env.static_libpython = getArgumentDefaulted("static_libpython", "")
    if env.static_libpython:
        assert os.path.exists(env.static_libpython), env.static_libpython

    # Python version we are working on.
    python_version_str = getArgumentDefaulted("python_version", None)
    if python_version_str is not None:
        env.python_version = tuple(int(d) for d in python_version_str.split("."))
    else:
        env.python_version = None

    # Modules count, determines if this is a large compilation.
    env.module_count = getArgumentInt("module_count", 0)

    _enableExperimentalSettings(env, experimental)

    return env


def decodeData(data):
    """Our own decode tries to workaround MSVC misbehavior."""
    try:
        return data.decode(sys.stdout.encoding)
    except UnicodeDecodeError:
        import locale

        try:
            return data.decode(locale.getpreferredencoding())
        except UnicodeDecodeError:
            return data.decode("utf8", "backslashreplace")


# Windows target mode: Compile for Windows. Used to be an option, but we
# no longer cross compile this way.
win_target = os.name == "nt"


def getExecutablePath(filename, env):
    """Find an execute in either normal PATH, or Scons detected PATH."""

    if os.path.exists(filename):
        return filename

    # Variable substitution from environment is needed, because this can contain
    # "$CC" which should be looked up too.
    while filename.startswith("$"):
        filename = env[filename[1:]]

    # Append ".exe" suffix  on Windows if not already present.
    if win_target and not filename.lower().endswith(".exe"):
        filename += ".exe"

    # Either look at the initial "PATH" as given from the outside or look at the
    # current environment.
    if env is None:
        search_path = os.environ["PATH"]
    else:
        search_path = env._dict["ENV"]["PATH"]  # pylint: disable=protected-access

    # Now check in each path element, much like the shell will.
    path_elements = search_path.split(os.pathsep)

    for path_element in path_elements:
        path_element = path_element.strip('"')

        full = os.path.normpath(os.path.join(path_element, filename))

        if os.path.exists(full):
            return full

    return None


def changeKeyboardInterruptToErrorExit():
    def signalHandler(
        signal, frame
    ):  # pylint: disable=redefined-outer-name,unused-argument
        sys.exit(2)

    signal.signal(signal.SIGINT, signalHandler)


def setEnvironmentVariable(env, key, value):
    if value is None:
        del os.environ[key]
    elif value in os.environ:
        os.environ[key] = value

    if env is not None:
        # pylint: disable=protected-access
        if value is None:
            del env._dict["ENV"][key]
        else:
            env._dict["ENV"][key] = value


def addToPATH(env, dirname, prefix):
    # Otherwise subprocess will complain in Python2
    if str is bytes and type(dirname) is unicode:
        dirname = dirname.encode("utf8")

    path_value = os.environ["PATH"].split(os.pathsep)

    if prefix:
        path_value.insert(0, dirname)
    else:
        path_value.append(dirname)

    setEnvironmentVariable(env, "PATH", os.pathsep.join(path_value))


def writeSconsReport(env, source_dir):
    with openTextFile(
        os.path.join(source_dir, "scons-report.txt"), "w", encoding="utf8"
    ) as report_file:
        # We are friends to get at this debug info, pylint: disable=protected-access
        for key, value in sorted(env._dict.items()):
            if type(value) is list and all(isinstance(v, basestring) for v in value):
                value = repr(value)

            if not isinstance(value, basestring):
                continue

            if key.startswith(("_", "CONFIGURE")):
                continue

            # Ignore problematic and useless values
            # spell-checker: ignore MSVSSCONS,IDLSUFFIXES,DSUFFIXES
            if key in ("MSVSSCONS", "BUILD_DIR", "IDLSUFFIXES", "DSUFFIXES"):
                continue

            # TODO: For these kinds of prints, maybe have our own method of doing them
            # rather than print, or maybe just json or something similar.
            print(key + "=" + value, file=report_file)

        print("gcc_mode=%s" % env.gcc_mode, file=report_file)
        print("clang_mode=%s" % env.clang_mode, file=report_file)
        print("msvc_mode=%s" % env.msvc_mode, file=report_file)
        print("mingw_mode=%s" % env.mingw_mode, file=report_file)
        print("clangcl_mode=%s" % env.clangcl_mode, file=report_file)

        print("PATH=%s" % os.environ["PATH"], file=report_file)


_scons_reports = {}


def flushSconsReports():
    _scons_reports.clear()


def readSconsReport(source_dir):
    if source_dir not in _scons_reports:
        scons_report = OrderedDict()

        for line in getFileContentByLine(
            os.path.join(source_dir, "scons-report.txt"), encoding="utf8"
        ):
            if "=" not in line:
                continue

            key, value = line.strip().split("=", 1)

            scons_report[key] = value

        _scons_reports[source_dir] = scons_report

    return _scons_reports[source_dir]


def getSconsReportValue(source_dir, key):
    return readSconsReport(source_dir).get(key)


def addClangClPathFromMSVC(env):
    cl_exe = getExecutablePath("cl", env=env)

    if cl_exe is None:
        scons_logger.sysexit(
            "Error, Visual Studio required for using ClangCL on Windows."
        )

    clang_dir = os.path.join(cl_exe[: cl_exe.lower().rfind("msvc")], "Llvm")

    if (
        getCompilerArch(
            mingw_mode=False, msvc_mode=True, the_cc_name="cl.exe", compiler_path=cl_exe
        )
        == "pei-x86-64"
    ):
        clang_dir = os.path.join(clang_dir, "x64", "bin")
    else:
        clang_dir = os.path.join(clang_dir, "bin")

    if not os.path.exists(clang_dir):
        scons_details_logger.sysexit(
            "Visual Studio has no Clang component found at '%s'." % clang_dir
        )

    scons_details_logger.info(
        "Adding Visual Studio directory '%s' for Clang to PATH." % clang_dir
    )

    addToPATH(env, clang_dir, prefix=True)

    clangcl_path = getExecutablePath("clang-cl", env=env)

    if clangcl_path is None:
        scons_details_logger.sysexit(
            "Visual Studio has no Clang component found at '%s'." % clang_dir
        )

    env["CC"] = "clang-cl"
    env["LINK"] = "lld-link"

    # Version information is outdated now, spell-checker: ignore ccversion
    env["CCVERSION"] = None


def isGccName(cc_name):
    return (
        "gcc" in cc_name
        or "g++" in cc_name
        or "gnu-cc" in cc_name
        or "gnu-gcc" in cc_name
    )


def isClangName(cc_name):
    return "clang" in cc_name and "-cl" not in cc_name


def cheapCopyFile(src, dst):
    dirname = os.path.dirname(dst)
    if not os.path.exists(dirname):
        os.makedirs(dirname)

    if win_target:
        # Windows has symlinks these days, but they do not integrate well
        # with Python2 at least. So make a copy in any case.
        if os.path.exists(dst):
            os.unlink(dst)
        shutil.copy(src, dst)
    else:
        # Relative paths work badly for links. Creating them relative is
        # not worth the effort.
        src = os.path.abspath(src)

        try:
            link_target = os.readlink(dst)

            # If it's already a proper link, do nothing then.
            if link_target == src:
                return

            os.unlink(dst)
        except OSError as _e:
            # Broken links work like that, remove them, so we can replace
            # them.
            try:
                os.unlink(dst)
            except OSError:
                pass

        try:
            os.symlink(src, dst)
        except OSError:
            shutil.copy(src, dst)


def provideStaticSourceFile(sub_path, nuitka_src, source_dir, c11_mode):
    source_filename = os.path.join(nuitka_src, "static_src", sub_path)
    target_filename = os.path.join(source_dir, "static_src", os.path.basename(sub_path))

    if target_filename.endswith(".c") and not c11_mode:
        target_filename += "pp"  # .cpp suffix then.

    cheapCopyFile(source_filename, target_filename)

    return target_filename


def scanSourceDir(env, dirname, plugins):
    if not os.path.exists(dirname):
        return

    # If we use C11 capable compiler, all good. Otherwise use C++, which Scons
    # needs to derive from filenames, so make copies (or links) with a different
    # name.
    added_path = False

    for filename in sorted(os.listdir(dirname)):
        if filename.endswith(".h") and plugins and not added_path:
            # Adding path for source paths on the fly, spell-checker: ignore cpppath
            env.Append(CPPPATH=[dirname])
            added_path = True

        # Only C files are of interest here.
        if not filename.endswith((".c", "cpp")) or not filename.startswith(
            ("module.", "__", "plugin.")
        ):
            continue

        filename = os.path.join(dirname, filename)

        target_file = filename

        # We pretend to use C++ if no C11 compiler is present.
        if env.c11_mode:
            yield filename
        else:
            if filename.endswith(".c"):
                target_file += "pp"  # .cpp" suffix then

                os.rename(filename, target_file)

            yield target_file


def makeCLiteral(value):
    value = value.replace("\\", r"\\")
    value = value.replace('"', r"\"")

    return '"' + value + '"'


def createDefinitionsFile(source_dir, filename, definitions):
    for env_name in os.environ["_NUITKA_BUILD_DEFINITIONS_CATALOG"].split(","):
        definitions[env_name] = os.environ[env_name]

    build_definitions_filename = os.path.join(source_dir, filename)

    with openTextFile(build_definitions_filename, "w", encoding="utf8") as f:
        for key, value in sorted(definitions.items()):
            if type(value) is int or key.endswith("_BOOL"):
                f.write("#define %s %s\n" % (key, value))
            else:
                f.write("#define %s %s\n" % (key, makeCLiteral(value)))


def getMsvcVersionString(env):
    import SCons.Tool.MSCommon.vc  # pylint: disable=I0021,import-error

    return SCons.Tool.MSCommon.vc.get_default_version(env)


def getMsvcVersion(env):
    value = getMsvcVersionString(env)

    value = value.replace("exp", "")
    return float(value)


def _getBinaryArch(binary, mingw_mode):
    if "linux" in sys.platform or mingw_mode:
        assert os.path.exists(binary), binary

        # Binutils binary name, spell-checker: ignore objdump,binutils
        command = ["objdump", "-f", binary]

        try:
            data, _err, rv = executeProcess(command)
        except OSError:
            command[0] = "llvm-objdump"

            try:
                data, _err, rv = executeProcess(command)
            except OSError:
                return None

        if rv != 0:
            return None

        if str is not bytes:
            data = decodeData(data)

        found = None

        for line in data.splitlines():
            if " file format " in line:
                found = line.split(" file format ")[-1]
            if "\tfile format " in line:
                found = line.split("\tfile format ")[-1]

        if os.name == "nt" and found == "coff-x86-64":
            found = "pei-x86-64"

        return found
    else:
        # TODO: Missing for macOS, FreeBSD, other Linux
        return None


_linker_arch_determined = False
_linker_arch = None


def getLinkerArch(target_arch, mingw_mode):
    # Singleton, pylint: disable=global-statement
    global _linker_arch_determined, _linker_arch

    if not _linker_arch_determined:
        if win_target:
            if target_arch == "x86_64":
                _linker_arch = "pei-x86-64"
            else:
                _linker_arch = "pei-i386"
        else:
            _linker_arch = _getBinaryArch(
                binary=os.environ["NUITKA_PYTHON_EXE_PATH"], mingw_mode=mingw_mode
            )

        _linker_arch_determined = True

    return _linker_arch


_compiler_arch = {}


def getCompilerArch(mingw_mode, msvc_mode, the_cc_name, compiler_path):
    assert not mingw_mode or not msvc_mode

    if compiler_path not in _compiler_arch:
        if mingw_mode:
            _compiler_arch[compiler_path] = _getBinaryArch(
                binary=compiler_path, mingw_mode=mingw_mode
            )
        elif msvc_mode:
            cmdline = [compiler_path]

            if "-cl" in the_cc_name:
                cmdline.append("--version")

            # The cl.exe without further args will give error
            stdout, stderr, _rv = executeProcess(
                command=cmdline,
            )

            # The MSVC will output on error, while clang outputs in stdout and they
            # use different names for arches.
            if b"x64" in stderr or b"x86_64" in stdout:
                _compiler_arch[compiler_path] = "pei-x86-64"
            elif b"x86" in stderr or b"i686" in stdout:
                _compiler_arch[compiler_path] = "pei-i386"
            elif b"ARM64" in stderr:
                # TODO: The ARM64 output for Clang is not known yet.
                _compiler_arch[compiler_path] = "pei-arm64"
            else:
                assert False, (stdout, stderr)
        else:
            assert False, compiler_path

    return _compiler_arch[compiler_path]


def decideArchMismatch(target_arch, the_cc_name, compiler_path):
    mingw_mode = isGccName(the_cc_name) or isClangName(the_cc_name)
    msvc_mode = not mingw_mode

    linker_arch = getLinkerArch(target_arch=target_arch, mingw_mode=mingw_mode)
    compiler_arch = getCompilerArch(
        mingw_mode=mingw_mode,
        msvc_mode=msvc_mode,
        the_cc_name=the_cc_name,
        compiler_path=compiler_path,
    )

    return linker_arch != compiler_arch, linker_arch, compiler_arch


def raiseNoCompilerFoundErrorExit():
    if os.name == "nt":
        scons_logger.sysexit(
            """\
Error, cannot locate suitable C compiler. You have the following options:

a) If a suitable Visual Studio version is installed, it will be located
   automatically via registry. But not if you activate the wrong prompt.

b) Using --mingw64 lets Nuitka download MinGW64 for you.

Note: MinGW64 is the name, it does *not* mean 64 bits, just a gcc with
better Windows compatibility, it is available for 32 and 64 bits. Cygwin
based gcc do not work.
"""
        )
    else:
        scons_logger.sysexit("Error, cannot locate suitable C compiler.")


def addBinaryBlobSection(env, blob_filename, section_name):
    # spell-checker: ignore linkflags, sectcreate

    if isMacOS():
        env.Append(
            LINKFLAGS=[
                "-Wl,-sectcreate,%(section_name)s,%(section_name)s,%(blob_filename)s"
                % {
                    "section_name": section_name,
                    "blob_filename": blob_filename,
                }
            ]
        )
    else:
        assert False
