"""IPython terminal interface using prompt_toolkit"""

import os
import sys
import inspect
from warnings import warn
from typing import Union as UnionType, Optional

from IPython.core.async_helpers import get_asyncio_loop
from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
from IPython.utils.py3compat import input
from IPython.utils.terminal import toggle_set_term_title, set_term_title, restore_term_title
from IPython.utils.process import abbrev_cwd
from traitlets import (
    Bool,
    Unicode,
    Dict,
    Integer,
    List,
    observe,
    Instance,
    Type,
    default,
    Enum,
    Union,
    Any,
    validate,
    Float,
    DottedObjectName,
)
from traitlets.utils.importstring import import_item


from prompt_toolkit.auto_suggest import AutoSuggestFromHistory
from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode
from prompt_toolkit.filters import HasFocus, Condition, IsDone
from prompt_toolkit.formatted_text import PygmentsTokens
from prompt_toolkit.history import History
from prompt_toolkit.layout.processors import ConditionalProcessor, HighlightMatchingBracketProcessor
from prompt_toolkit.output import ColorDepth
from prompt_toolkit.patch_stdout import patch_stdout
from prompt_toolkit.shortcuts import PromptSession, CompleteStyle, print_formatted_text
from prompt_toolkit.styles import DynamicStyle, merge_styles
from prompt_toolkit.styles.pygments import style_from_pygments_cls, style_from_pygments_dict
from prompt_toolkit import __version__ as ptk_version

from pygments.styles import get_style_by_name
from pygments.style import Style
from pygments.token import Token

from .debugger import TerminalPdb, Pdb
from .magics import TerminalMagics
from .pt_inputhooks import get_inputhook_name_and_func
from .prompts import Prompts, ClassicPrompts, RichPromptDisplayHook
from .ptutils import IPythonPTCompleter, IPythonPTLexer
from .shortcuts import (
    KEY_BINDINGS,
    UNASSIGNED_ALLOWED_COMMANDS,
    create_ipython_shortcuts,
    create_identifier,
    RuntimeBinding,
    add_binding,
)
from .shortcuts.filters import KEYBINDING_FILTERS, filter_from_string
from .shortcuts.auto_suggest import (
    NavigableAutoSuggestFromHistory,
    AppendAutoSuggestionInAnyLine,
)

PTK3 = ptk_version.startswith('3.')


class _NoStyle(Style):
    pass


_style_overrides_light_bg = {
            Token.Prompt: '#ansibrightblue',
            Token.PromptNum: '#ansiblue bold',
            Token.OutPrompt: '#ansibrightred',
            Token.OutPromptNum: '#ansired bold',
}

_style_overrides_linux = {
            Token.Prompt: '#ansibrightgreen',
            Token.PromptNum: '#ansigreen bold',
            Token.OutPrompt: '#ansibrightred',
            Token.OutPromptNum: '#ansired bold',
}


def _backward_compat_continuation_prompt_tokens(method, width: int, *, lineno: int):
    """
    Sagemath use custom prompt and we broke them in 8.19.
    """
    sig = inspect.signature(method)
    if "lineno" in inspect.signature(method).parameters or any(
        [p.kind == p.VAR_KEYWORD for p in sig.parameters.values()]
    ):
        return method(width, lineno=lineno)
    else:
        return method(width)


def get_default_editor():
    try:
        return os.environ['EDITOR']
    except KeyError:
        pass
    except UnicodeError:
        warn("$EDITOR environment variable is not pure ASCII. Using platform "
             "default editor.")

    if os.name == 'posix':
        return 'vi'  # the only one guaranteed to be there!
    else:
        return "notepad"  # same in Windows!


# conservatively check for tty
# overridden streams can result in things like:
# - sys.stdin = None
# - no isatty method
for _name in ('stdin', 'stdout', 'stderr'):
    _stream = getattr(sys, _name)
    try:
        if not _stream or not hasattr(_stream, "isatty") or not _stream.isatty():
            _is_tty = False
            break
    except ValueError:
        # stream is closed
        _is_tty = False
        break
else:
    _is_tty = True


_use_simple_prompt = ('IPY_TEST_SIMPLE_PROMPT' in os.environ) or (not _is_tty)

def black_reformat_handler(text_before_cursor):
    """
    We do not need to protect against error,
    this is taken care at a higher level where any reformat error is ignored.
    Indeed we may call reformatting on incomplete code.
    """
    import black

    formatted_text = black.format_str(text_before_cursor, mode=black.FileMode())
    if not text_before_cursor.endswith("\n") and formatted_text.endswith("\n"):
        formatted_text = formatted_text[:-1]
    return formatted_text


def yapf_reformat_handler(text_before_cursor):
    from yapf.yapflib import file_resources
    from yapf.yapflib import yapf_api

    style_config = file_resources.GetDefaultStyleForDir(os.getcwd())
    formatted_text, was_formatted = yapf_api.FormatCode(
        text_before_cursor, style_config=style_config
    )
    if was_formatted:
        if not text_before_cursor.endswith("\n") and formatted_text.endswith("\n"):
            formatted_text = formatted_text[:-1]
        return formatted_text
    else:
        return text_before_cursor


class PtkHistoryAdapter(History):
    """
    Prompt toolkit has it's own way of handling history, Where it assumes it can
    Push/pull from history.

    """

    def __init__(self, shell):
        super().__init__()
        self.shell = shell
        self._refresh()

    def append_string(self, string):
        # we rely on sql for that.
        self._loaded = False
        self._refresh()

    def _refresh(self):
        if not self._loaded:
            self._loaded_strings = list(self.load_history_strings())

    def load_history_strings(self):
        last_cell = ""
        res = []
        for __, ___, cell in self.shell.history_manager.get_tail(
            self.shell.history_load_length, include_latest=True
        ):
            # Ignore blank lines and consecutive duplicates
            cell = cell.rstrip()
            if cell and (cell != last_cell):
                res.append(cell)
                last_cell = cell
        yield from res[::-1]

    def store_string(self, string: str) -> None:
        pass

class TerminalInteractiveShell(InteractiveShell):
    mime_renderers = Dict().tag(config=True)

    space_for_menu = Integer(6, help='Number of line at the bottom of the screen '
                                     'to reserve for the tab completion menu, '
                                     'search history, ...etc, the height of '
                                     'these menus will at most this value. '
                                     'Increase it is you prefer long and skinny '
                                     'menus, decrease for short and wide.'
                            ).tag(config=True)

    pt_app: UnionType[PromptSession, None] = None
    auto_suggest: UnionType[
        AutoSuggestFromHistory,
        NavigableAutoSuggestFromHistory,
        None,
    ] = None
    debugger_history = None

    debugger_history_file = Unicode(
        "~/.pdbhistory", help="File in which to store and read history"
    ).tag(config=True)

    simple_prompt = Bool(_use_simple_prompt,
        help="""Use `raw_input` for the REPL, without completion and prompt colors.

            Useful when controlling IPython as a subprocess, and piping
            STDIN/OUT/ERR. Known usage are: IPython's own testing machinery,
            and emacs' inferior-python subprocess (assuming you have set
            `python-shell-interpreter` to "ipython") available through the
            built-in `M-x run-python` and third party packages such as elpy.

            This mode default to `True` if the `IPY_TEST_SIMPLE_PROMPT`
            environment variable is set, or the current terminal is not a tty.
            Thus the Default value reported in --help-all, or config will often
            be incorrectly reported.
            """,
    ).tag(config=True)

    @property
    def debugger_cls(self):
        return Pdb if self.simple_prompt else TerminalPdb

    confirm_exit = Bool(True,
        help="""
        Set to confirm when you try to exit IPython with an EOF (Control-D
        in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit',
        you can force a direct exit without any confirmation.""",
    ).tag(config=True)

    editing_mode = Unicode('emacs',
        help="Shortcut style to use at the prompt. 'vi' or 'emacs'.",
    ).tag(config=True)

    emacs_bindings_in_vi_insert_mode = Bool(
        True,
        help="Add shortcuts from 'emacs' insert mode to 'vi' insert mode.",
    ).tag(config=True)

    modal_cursor = Bool(
        True,
        help="""
       Cursor shape changes depending on vi mode: beam in vi insert mode,
       block in nav mode, underscore in replace mode.""",
    ).tag(config=True)

    ttimeoutlen = Float(
        0.01,
        help="""The time in milliseconds that is waited for a key code
       to complete.""",
    ).tag(config=True)

    timeoutlen = Float(
        0.5,
        help="""The time in milliseconds that is waited for a mapped key
       sequence to complete.""",
    ).tag(config=True)

    autoformatter = Unicode(
        None,
        help="Autoformatter to reformat Terminal code. Can be `'black'`, `'yapf'` or `None`",
        allow_none=True
    ).tag(config=True)

    auto_match = Bool(
        False,
        help="""
        Automatically add/delete closing bracket or quote when opening bracket or quote is entered/deleted.
        Brackets: (), [], {}
        Quotes: '', \"\"
        """,
    ).tag(config=True)

    mouse_support = Bool(False,
        help="Enable mouse support in the prompt\n(Note: prevents selecting text with the mouse)"
    ).tag(config=True)

    # We don't load the list of styles for the help string, because loading
    # Pygments plugins takes time and can cause unexpected errors.
    highlighting_style = Union([Unicode('legacy'), Type(klass=Style)],
        help="""The name or class of a Pygments style to use for syntax
        highlighting. To see available styles, run `pygmentize -L styles`."""
    ).tag(config=True)

    @validate('editing_mode')
    def _validate_editing_mode(self, proposal):
        if proposal['value'].lower() == 'vim':
            proposal['value']= 'vi'
        elif proposal['value'].lower() == 'default':
            proposal['value']= 'emacs'

        if hasattr(EditingMode, proposal['value'].upper()):
            return proposal['value'].lower()

        return self.editing_mode

    @observe('editing_mode')
    def _editing_mode(self, change):
        if self.pt_app:
            self.pt_app.editing_mode = getattr(EditingMode, change.new.upper())

    def _set_formatter(self, formatter):
        if formatter is None:
            self.reformat_handler = lambda x:x
        elif formatter == 'black':
            self.reformat_handler = black_reformat_handler
        elif formatter == "yapf":
            self.reformat_handler = yapf_reformat_handler
        else:
            raise ValueError

    @observe("autoformatter")
    def _autoformatter_changed(self, change):
        formatter = change.new
        self._set_formatter(formatter)

    @observe('highlighting_style')
    @observe('colors')
    def _highlighting_style_changed(self, change):
        self.refresh_style()

    def refresh_style(self):
        self._style = self._make_style_from_name_or_cls(self.highlighting_style)

    highlighting_style_overrides = Dict(
        help="Override highlighting format for specific tokens"
    ).tag(config=True)

    true_color = Bool(False,
        help="""Use 24bit colors instead of 256 colors in prompt highlighting.
        If your terminal supports true color, the following command should
        print ``TRUECOLOR`` in orange::

            printf \"\\x1b[38;2;255;100;0mTRUECOLOR\\x1b[0m\\n\"
        """,
    ).tag(config=True)

    editor = Unicode(get_default_editor(),
        help="Set the editor used by IPython (default to $EDITOR/vi/notepad)."
    ).tag(config=True)

    prompts_class = Type(Prompts, help='Class used to generate Prompt token for prompt_toolkit').tag(config=True)

    prompts = Instance(Prompts)

    @default('prompts')
    def _prompts_default(self):
        return self.prompts_class(self)

#    @observe('prompts')
#    def _(self, change):
#        self._update_layout()

    @default('displayhook_class')
    def _displayhook_class_default(self):
        return RichPromptDisplayHook

    term_title = Bool(True,
        help="Automatically set the terminal title"
    ).tag(config=True)

    term_title_format = Unicode("IPython: {cwd}",
        help="Customize the terminal title format.  This is a python format string. " +
             "Available substitutions are: {cwd}."
    ).tag(config=True)

    display_completions = Enum(('column', 'multicolumn','readlinelike'),
        help= ( "Options for displaying tab completions, 'column', 'multicolumn', and "
                "'readlinelike'. These options are for `prompt_toolkit`, see "
                "`prompt_toolkit` documentation for more information."
                ),
        default_value='multicolumn').tag(config=True)

    highlight_matching_brackets = Bool(True,
        help="Highlight matching brackets.",
    ).tag(config=True)

    extra_open_editor_shortcuts = Bool(False,
        help="Enable vi (v) or Emacs (C-X C-E) shortcuts to open an external editor. "
             "This is in addition to the F2 binding, which is always enabled."
    ).tag(config=True)

    handle_return = Any(None,
        help="Provide an alternative handler to be called when the user presses "
             "Return. This is an advanced option intended for debugging, which "
             "may be changed or removed in later releases."
    ).tag(config=True)

    enable_history_search = Bool(True,
        help="Allows to enable/disable the prompt toolkit history search"
    ).tag(config=True)

    autosuggestions_provider = Unicode(
        "NavigableAutoSuggestFromHistory",
        help="Specifies from which source automatic suggestions are provided. "
        "Can be set to ``'NavigableAutoSuggestFromHistory'`` (:kbd:`up` and "
        ":kbd:`down` swap suggestions), ``'AutoSuggestFromHistory'``, "
        " or ``None`` to disable automatic suggestions. "
        "Default is `'NavigableAutoSuggestFromHistory`'.",
        allow_none=True,
    ).tag(config=True)
    _autosuggestions_provider: Any

    llm_constructor_kwargs = Dict(
        {},
        help="""
        Extra arguments to pass to `llm_provider_class` constructor.

        This is used to – for example – set the `model_id`""",
    ).tag(config=True)

    llm_prefix_from_history = DottedObjectName(
        "input_history",
        help="""\
    Fully Qualifed name of a function that takes an IPython history manager and
    return a prefix to pass the llm provider in addition to the current buffer
    text.

    You can use:

     - no_prefix
     - input_history

    As default value. `input_history` (default),  will use all the input history
    of current IPython session

    """,
    ).tag(config=True)
    _llm_prefix_from_history: Any

    @observe("llm_prefix_from_history")
    def _llm_prefix_from_history_changed(self, change):
        name = change.new
        self._llm_prefix_from_history = name
        self._set_autosuggestions()

    llm_provider_class = DottedObjectName(
        None,
        allow_none=True,
        help="""\
        Provisional:
            This is a provisinal API in IPython 8.32, before stabilisation
            in 9.0, it may change without warnings.

        class to use for the `NavigableAutoSuggestFromHistory` to request
        completions from a LLM, this should inherit from
        `jupyter_ai_magics:BaseProvider` and implement
        `stream_inline_completions`
    """,
    ).tag(config=True)
    _llm_provider_class: Any = None

    @observe("llm_provider_class")
    def _llm_provider_class_changed(self, change):
        provider_class = change.new
        if provider_class is not None:
            warn(
                "TerminalInteractiveShell.llm_provider_class is a provisional"
                "  API as of IPython 8.32, and may change without warnings."
            )
        self._llm_provider_class = provider_class
        self._set_autosuggestions()

    def _set_autosuggestions(self, provider=None):
        if provider is None:
            provider = self.autosuggestions_provider
        # disconnect old handler
        if self.auto_suggest and isinstance(
            self.auto_suggest, NavigableAutoSuggestFromHistory
        ):
            self.auto_suggest.disconnect()
        if provider is None:
            self.auto_suggest = None
        elif provider == "AutoSuggestFromHistory":
            self.auto_suggest = AutoSuggestFromHistory()
        elif provider == "NavigableAutoSuggestFromHistory":
            # LLM stuff are all Provisional in 8.32
            if self._llm_provider_class:
                llm_provider_constructor = import_item(self._llm_provider_class)
                llm_provider = llm_provider_constructor(**self.llm_constructor_kwargs)
            else:
                llm_provider = None
            self.auto_suggest = NavigableAutoSuggestFromHistory()
            # Provisinal in 8.32
            self.auto_suggest._llm_provider = llm_provider

            name = self.llm_prefix_from_history

            if name == "no_prefix":

                def no_prefix(history_manager):
                    return ""

                fun = no_prefix

            elif name == "input_history":

                def input_history(history_manager):
                    return "\n".join([s[2] for s in history_manager.get_range()]) + "\n"

                fun = input_history

            else:
                fun = import_item(name)
            self.auto_suggest._llm_prefixer = fun
        else:
            raise ValueError("No valid provider.")
        if self.pt_app:
            self.pt_app.auto_suggest = self.auto_suggest

    @observe("autosuggestions_provider")
    def _autosuggestions_provider_changed(self, change):
        provider = change.new
        self._set_autosuggestions(provider)

    shortcuts = List(
        trait=Dict(
            key_trait=Enum(
                [
                    "command",
                    "match_keys",
                    "match_filter",
                    "new_keys",
                    "new_filter",
                    "create",
                ]
            ),
            per_key_traits={
                "command": Unicode(),
                "match_keys": List(Unicode()),
                "match_filter": Unicode(),
                "new_keys": List(Unicode()),
                "new_filter": Unicode(),
                "create": Bool(False),
            },
        ),
        help="""
        Add, disable or modifying shortcuts.

        Each entry on the list should be a dictionary with ``command`` key
        identifying the target function executed by the shortcut and at least
        one of the following:

          - ``match_keys``: list of keys used to match an existing shortcut,
          - ``match_filter``: shortcut filter used to match an existing shortcut,
          - ``new_keys``: list of keys to set,
          - ``new_filter``: a new shortcut filter to set

        The filters have to be composed of pre-defined verbs and joined by one
        of the following conjunctions: ``&`` (and), ``|`` (or), ``~`` (not).
        The pre-defined verbs are:

        {filters}

        To disable a shortcut set ``new_keys`` to an empty list.
        To add a shortcut add key ``create`` with value ``True``.

        When modifying/disabling shortcuts, ``match_keys``/``match_filter`` can
        be omitted if the provided specification uniquely identifies a shortcut
        to be modified/disabled. When modifying a shortcut ``new_filter`` or
        ``new_keys`` can be omitted which will result in reuse of the existing
        filter/keys.

        Only shortcuts defined in IPython (and not default prompt-toolkit
        shortcuts) can be modified or disabled. The full list of shortcuts,
        command identifiers and filters is available under
        :ref:`terminal-shortcuts-list`.

        Here is an example:

        .. code::

            c.TerminalInteractiveShell.shortcuts = [
               {{
                   "new_keys": ["c-q"],
                   "command": "prompt_toolkit:named_commands.capitalize_word",
                   "create": True,
               }},
               {{
                   "new_keys": ["c-j"],
                   "command": "prompt_toolkit:named_commands.beginning_of_line",
                   "create": True,
               }},
            ]


        """.format(
            filters="\n        ".join([f"  - ``{k}``" for k in KEYBINDING_FILTERS])
        ),
    ).tag(config=True)

    @observe("shortcuts")
    def _shortcuts_changed(self, change):
        if self.pt_app:
            self.pt_app.key_bindings = self._merge_shortcuts(user_shortcuts=change.new)

    def _merge_shortcuts(self, user_shortcuts):
        # rebuild the bindings list from scratch
        key_bindings = create_ipython_shortcuts(self)

        # for now we only allow adding shortcuts for a specific set of
        # commands; this is a security precution.
        allowed_commands = {
            create_identifier(binding.command): binding.command
            for binding in KEY_BINDINGS
        }
        allowed_commands.update(
            {
                create_identifier(command): command
                for command in UNASSIGNED_ALLOWED_COMMANDS
            }
        )
        shortcuts_to_skip = []
        shortcuts_to_add = []

        for shortcut in user_shortcuts:
            command_id = shortcut["command"]
            if command_id not in allowed_commands:
                allowed_commands = "\n - ".join(allowed_commands)
                raise ValueError(
                    f"{command_id} is not a known shortcut command."
                    f" Allowed commands are: \n - {allowed_commands}"
                )
            old_keys = shortcut.get("match_keys", None)
            old_filter = (
                filter_from_string(shortcut["match_filter"])
                if "match_filter" in shortcut
                else None
            )
            matching = [
                binding
                for binding in KEY_BINDINGS
                if (
                    (old_filter is None or binding.filter == old_filter)
                    and (old_keys is None or [k for k in binding.keys] == old_keys)
                    and create_identifier(binding.command) == command_id
                )
            ]

            new_keys = shortcut.get("new_keys", None)
            new_filter = shortcut.get("new_filter", None)

            command = allowed_commands[command_id]

            creating_new = shortcut.get("create", False)
            modifying_existing = not creating_new and (
                new_keys is not None or new_filter
            )

            if creating_new and new_keys == []:
                raise ValueError("Cannot add a shortcut without keys")

            if modifying_existing:
                specification = {
                    key: shortcut[key]
                    for key in ["command", "filter"]
                    if key in shortcut
                }
                if len(matching) == 0:
                    raise ValueError(
                        f"No shortcuts matching {specification} found in {KEY_BINDINGS}"
                    )
                elif len(matching) > 1:
                    raise ValueError(
                        f"Multiple shortcuts matching {specification} found,"
                        f" please add keys/filter to select one of: {matching}"
                    )

                matched = matching[0]
                old_filter = matched.filter
                old_keys = list(matched.keys)
                shortcuts_to_skip.append(
                    RuntimeBinding(
                        command,
                        keys=old_keys,
                        filter=old_filter,
                    )
                )

            if new_keys != []:
                shortcuts_to_add.append(
                    RuntimeBinding(
                        command,
                        keys=new_keys or old_keys,
                        filter=(
                            filter_from_string(new_filter)
                            if new_filter is not None
                            else (
                                old_filter
                                if old_filter is not None
                                else filter_from_string("always")
                            )
                        ),
                    )
                )

        # rebuild the bindings list from scratch
        key_bindings = create_ipython_shortcuts(self, skip=shortcuts_to_skip)
        for binding in shortcuts_to_add:
            add_binding(key_bindings, binding)

        return key_bindings

    prompt_includes_vi_mode = Bool(True,
        help="Display the current vi mode (when using vi editing mode)."
    ).tag(config=True)

    prompt_line_number_format = Unicode(
        "",
        help="The format for line numbering, will be passed `line` (int, 1 based)"
        " the current line number and `rel_line` the relative line number."
        " for example to display both you can use the following template string :"
        " c.TerminalInteractiveShell.prompt_line_number_format='{line: 4d}/{rel_line:+03d} | '"
        " This will display the current line number, with leading space and a width of at least 4"
        " character, as well as the relative line number 0 padded and always with a + or - sign."
        " Note that when using Emacs mode the prompt of the first line may not update.",
    ).tag(config=True)

    @observe('term_title')
    def init_term_title(self, change=None):
        # Enable or disable the terminal title.
        if self.term_title and _is_tty:
            toggle_set_term_title(True)
            set_term_title(self.term_title_format.format(cwd=abbrev_cwd()))
        else:
            toggle_set_term_title(False)

    def restore_term_title(self):
        if self.term_title and _is_tty:
            restore_term_title()

    def init_display_formatter(self):
        super(TerminalInteractiveShell, self).init_display_formatter()
        # terminal only supports plain text
        self.display_formatter.active_types = ["text/plain"]

    def init_prompt_toolkit_cli(self):
        if self.simple_prompt:
            # Fall back to plain non-interactive output for tests.
            # This is very limited.
            def prompt():
                prompt_text = "".join(x[1] for x in self.prompts.in_prompt_tokens())
                lines = [input(prompt_text)]
                prompt_continuation = "".join(x[1] for x in self.prompts.continuation_prompt_tokens())
                while self.check_complete('\n'.join(lines))[0] == 'incomplete':
                    lines.append( input(prompt_continuation) )
                return '\n'.join(lines)
            self.prompt_for_code = prompt
            return

        # Set up keyboard shortcuts
        key_bindings = self._merge_shortcuts(user_shortcuts=self.shortcuts)

        # Pre-populate history from IPython's history database
        history = PtkHistoryAdapter(self)

        self._style = self._make_style_from_name_or_cls(self.highlighting_style)
        self.style = DynamicStyle(lambda: self._style)

        editing_mode = getattr(EditingMode, self.editing_mode.upper())

        self._use_asyncio_inputhook = False
        self.pt_app = PromptSession(
            auto_suggest=self.auto_suggest,
            editing_mode=editing_mode,
            key_bindings=key_bindings,
            history=history,
            completer=IPythonPTCompleter(shell=self),
            enable_history_search=self.enable_history_search,
            style=self.style,
            include_default_pygments_style=False,
            mouse_support=self.mouse_support,
            enable_open_in_editor=self.extra_open_editor_shortcuts,
            color_depth=self.color_depth,
            tempfile_suffix=".py",
            **self._extra_prompt_options(),
        )
        if isinstance(self.auto_suggest, NavigableAutoSuggestFromHistory):
            self.auto_suggest.connect(self.pt_app)

    def _make_style_from_name_or_cls(self, name_or_cls):
        """
        Small wrapper that make an IPython compatible style from a style name

        We need that to add style for prompt ... etc.
        """
        style_overrides = {}
        if name_or_cls == 'legacy':
            legacy = self.colors.lower()
            if legacy == 'linux':
                style_cls = get_style_by_name('monokai')
                style_overrides = _style_overrides_linux
            elif legacy == 'lightbg':
                style_overrides = _style_overrides_light_bg
                style_cls = get_style_by_name('pastie')
            elif legacy == 'neutral':
                # The default theme needs to be visible on both a dark background
                # and a light background, because we can't tell what the terminal
                # looks like. These tweaks to the default theme help with that.
                style_cls = get_style_by_name('default')
                style_overrides.update({
                    Token.Number: '#ansigreen',
                    Token.Operator: 'noinherit',
                    Token.String: '#ansiyellow',
                    Token.Name.Function: '#ansiblue',
                    Token.Name.Class: 'bold #ansiblue',
                    Token.Name.Namespace: 'bold #ansiblue',
                    Token.Name.Variable.Magic: '#ansiblue',
                    Token.Prompt: '#ansigreen',
                    Token.PromptNum: '#ansibrightgreen bold',
                    Token.OutPrompt: '#ansired',
                    Token.OutPromptNum: '#ansibrightred bold',
                })

                # Hack: Due to limited color support on the Windows console
                # the prompt colors will be wrong without this
                if os.name == 'nt':
                    style_overrides.update({
                        Token.Prompt: '#ansidarkgreen',
                        Token.PromptNum: '#ansigreen bold',
                        Token.OutPrompt: '#ansidarkred',
                        Token.OutPromptNum: '#ansired bold',
                    })
            elif legacy =='nocolor':
                style_cls=_NoStyle
                style_overrides = {}
            else :
                raise ValueError('Got unknown colors: ', legacy)
        else :
            if isinstance(name_or_cls, str):
                style_cls = get_style_by_name(name_or_cls)
            else:
                style_cls = name_or_cls
            style_overrides = {
                Token.Prompt: '#ansigreen',
                Token.PromptNum: '#ansibrightgreen bold',
                Token.OutPrompt: '#ansired',
                Token.OutPromptNum: '#ansibrightred bold',
            }
        style_overrides.update(self.highlighting_style_overrides)
        style = merge_styles([
            style_from_pygments_cls(style_cls),
            style_from_pygments_dict(style_overrides),
        ])

        return style

    @property
    def pt_complete_style(self):
        return {
            'multicolumn': CompleteStyle.MULTI_COLUMN,
            'column': CompleteStyle.COLUMN,
            'readlinelike': CompleteStyle.READLINE_LIKE,
        }[self.display_completions]

    @property
    def color_depth(self):
        return (ColorDepth.TRUE_COLOR if self.true_color else None)

    def _extra_prompt_options(self):
        """
        Return the current layout option for the current Terminal InteractiveShell
        """
        def get_message():
            return PygmentsTokens(self.prompts.in_prompt_tokens())

        if self.editing_mode == "emacs" and self.prompt_line_number_format == "":
            # with emacs mode the prompt is (usually) static, so we call only
            # the function once. With VI mode it can toggle between [ins] and
            # [nor] so we can't precompute.
            # here I'm going to favor the default keybinding which almost
            # everybody uses to decrease CPU usage.
            # if we have issues with users with custom Prompts we can see how to
            # work around this.
            get_message = get_message()

        options = {
            "complete_in_thread": False,
            "lexer": IPythonPTLexer(),
            "reserve_space_for_menu": self.space_for_menu,
            "message": get_message,
            "prompt_continuation": (
                lambda width, lineno, is_soft_wrap: PygmentsTokens(
                    _backward_compat_continuation_prompt_tokens(
                        self.prompts.continuation_prompt_tokens, width, lineno=lineno
                    )
                )
            ),
            "multiline": True,
            "complete_style": self.pt_complete_style,
            "input_processors": [
                # Highlight matching brackets, but only when this setting is
                # enabled, and only when the DEFAULT_BUFFER has the focus.
                ConditionalProcessor(
                    processor=HighlightMatchingBracketProcessor(chars="[](){}"),
                    filter=HasFocus(DEFAULT_BUFFER)
                    & ~IsDone()
                    & Condition(lambda: self.highlight_matching_brackets),
                ),
                # Show auto-suggestion in lines other than the last line.
                ConditionalProcessor(
                    processor=AppendAutoSuggestionInAnyLine(),
                    filter=HasFocus(DEFAULT_BUFFER)
                    & ~IsDone()
                    & Condition(
                        lambda: isinstance(
                            self.auto_suggest,
                            NavigableAutoSuggestFromHistory,
                        )
                    ),
                ),
            ],
        }
        if not PTK3:
            options['inputhook'] = self.inputhook

        return options

    def prompt_for_code(self):
        if self.rl_next_input:
            default = self.rl_next_input
            self.rl_next_input = None
        else:
            default = ''

        # In order to make sure that asyncio code written in the
        # interactive shell doesn't interfere with the prompt, we run the
        # prompt in a different event loop.
        # If we don't do this, people could spawn coroutine with a
        # while/true inside which will freeze the prompt.

        with patch_stdout(raw=True):
            if self._use_asyncio_inputhook:
                # When we integrate the asyncio event loop, run the UI in the
                # same event loop as the rest of the code. don't use an actual
                # input hook. (Asyncio is not made for nesting event loops.)
                asyncio_loop = get_asyncio_loop()
                text = asyncio_loop.run_until_complete(
                    self.pt_app.prompt_async(
                        default=default, **self._extra_prompt_options()
                    )
                )
            else:
                text = self.pt_app.prompt(
                    default=default,
                    inputhook=self._inputhook,
                    **self._extra_prompt_options(),
                )

        return text

    def enable_win_unicode_console(self):
        # Since IPython 7.10 doesn't support python < 3.6 and PEP 528, Python uses the unicode APIs for the Windows
        # console by default, so WUC shouldn't be needed.
        warn("`enable_win_unicode_console` is deprecated since IPython 7.10, does not do anything and will be removed in the future",
             DeprecationWarning,
             stacklevel=2)

    def init_io(self):
        if sys.platform not in {'win32', 'cli'}:
            return

        import colorama
        colorama.init()

    def init_magics(self):
        super(TerminalInteractiveShell, self).init_magics()
        self.register_magics(TerminalMagics)

    def init_alias(self):
        # The parent class defines aliases that can be safely used with any
        # frontend.
        super(TerminalInteractiveShell, self).init_alias()

        # Now define aliases that only make sense on the terminal, because they
        # need direct access to the console in a way that we can't emulate in
        # GUI or web frontend
        if os.name == 'posix':
            for cmd in ('clear', 'more', 'less', 'man'):
                self.alias_manager.soft_define_alias(cmd, cmd)

    def __init__(self, *args, **kwargs) -> None:
        super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
        self._set_autosuggestions(self.autosuggestions_provider)
        self.init_prompt_toolkit_cli()
        self.init_term_title()
        self.keep_running = True
        self._set_formatter(self.autoformatter)

    def ask_exit(self):
        self.keep_running = False

    rl_next_input = None

    def interact(self):
        self.keep_running = True
        while self.keep_running:
            print(self.separate_in, end='')

            try:
                code = self.prompt_for_code()
            except EOFError:
                if (not self.confirm_exit) \
                        or self.ask_yes_no('Do you really want to exit ([y]/n)?','y','n'):
                    self.ask_exit()

            else:
                if code:
                    self.run_cell(code, store_history=True)

    def mainloop(self):
        # An extra layer of protection in case someone mashing Ctrl-C breaks
        # out of our internal code.
        while True:
            try:
                self.interact()
                break
            except KeyboardInterrupt as e:
                print("\n%s escaped interact()\n" % type(e).__name__)
            finally:
                # An interrupt during the eventloop will mess up the
                # internal state of the prompt_toolkit library.
                # Stopping the eventloop fixes this, see
                # https://github.com/ipython/ipython/pull/9867
                if hasattr(self, '_eventloop'):
                    self._eventloop.stop()

                self.restore_term_title()

        # try to call some at-exit operation optimistically as some things can't
        # be done during interpreter shutdown. this is technically inaccurate as
        # this make mainlool not re-callable, but that should be a rare if not
        # in existent use case.

        self._atexit_once()

    _inputhook = None
    def inputhook(self, context):
        if self._inputhook is not None:
            self._inputhook(context)

    active_eventloop: Optional[str] = None

    def enable_gui(self, gui: Optional[str] = None) -> None:
        if gui:
            from ..core.pylabtools import _convert_gui_from_matplotlib

            gui = _convert_gui_from_matplotlib(gui)

        if self.simple_prompt is True and gui is not None:
            print(
                f'Cannot install event loop hook for "{gui}" when running with `--simple-prompt`.'
            )
            print(
                "NOTE: Tk is supported natively; use Tk apps and Tk backends with `--simple-prompt`."
            )
            return

        if self._inputhook is None and gui is None:
            print("No event loop hook running.")
            return

        if self._inputhook is not None and gui is not None:
            newev, newinhook = get_inputhook_name_and_func(gui)
            if self._inputhook == newinhook:
                # same inputhook, do nothing
                self.log.info(
                    f"Shell is already running the {self.active_eventloop} eventloop. Doing nothing"
                )
                return
            self.log.warning(
                f"Shell is already running a different gui event loop for {self.active_eventloop}. "
                "Call with no arguments to disable the current loop."
            )
            return
        if self._inputhook is not None and gui is None:
            self.active_eventloop = self._inputhook = None

        if gui and (gui not in {None, "webagg"}):
            # This hook runs with each cycle of the `prompt_toolkit`'s event loop.
            self.active_eventloop, self._inputhook = get_inputhook_name_and_func(gui)
        else:
            self.active_eventloop = self._inputhook = None

        self._use_asyncio_inputhook = gui == "asyncio"

    # Run !system commands directly, not through pipes, so terminal programs
    # work correctly.
    system = InteractiveShell.system_raw

    def auto_rewrite_input(self, cmd):
        """Overridden from the parent class to use fancy rewriting prompt"""
        if not self.show_rewritten_input:
            return

        tokens = self.prompts.rewrite_prompt_tokens()
        if self.pt_app:
            print_formatted_text(PygmentsTokens(tokens), end='',
                                 style=self.pt_app.app.style)
            print(cmd)
        else:
            prompt = ''.join(s for t, s in tokens)
            print(prompt, cmd, sep='')

    _prompts_before = None
    def switch_doctest_mode(self, mode):
        """Switch prompts to classic for %doctest_mode"""
        if mode:
            self._prompts_before = self.prompts
            self.prompts = ClassicPrompts(self)
        elif self._prompts_before:
            self.prompts = self._prompts_before
            self._prompts_before = None
#        self._update_layout()


InteractiveShellABC.register(TerminalInteractiveShell)

if __name__ == '__main__':
    TerminalInteractiveShell.instance().interact()
