"""
Module to define and register Terminal IPython shortcuts with
:mod:`prompt_toolkit`
"""

# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.

import os
import signal
import sys
import warnings
from dataclasses import dataclass
from typing import Any, Optional, List
from collections.abc import Callable

from prompt_toolkit.application.current import get_app
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.key_binding.key_processor import KeyPressEvent
from prompt_toolkit.key_binding.bindings import named_commands as nc
from prompt_toolkit.key_binding.bindings.completion import (
    display_completions_like_readline,
)
from prompt_toolkit.key_binding.vi_state import InputMode, ViState
from prompt_toolkit.filters import Condition

from IPython.core.getipython import get_ipython
from . import auto_match as match
from . import auto_suggest
from .filters import filter_from_string
from IPython.utils.decorators import undoc

from prompt_toolkit.enums import DEFAULT_BUFFER

__all__ = ["create_ipython_shortcuts"]


@dataclass
class BaseBinding:
    command: Callable[[KeyPressEvent], Any]
    keys: List[str]


@dataclass
class RuntimeBinding(BaseBinding):
    filter: Condition


@dataclass
class Binding(BaseBinding):
    # while filter could be created by referencing variables directly (rather
    # than created from strings), by using strings we ensure that users will
    # be able to create filters in configuration (e.g. JSON) files too, which
    # also benefits the documentation by enforcing human-readable filter names.
    condition: Optional[str] = None

    def __post_init__(self):
        if self.condition:
            self.filter = filter_from_string(self.condition)
        else:
            self.filter = None


def create_identifier(handler: Callable):
    parts = handler.__module__.split(".")
    name = handler.__name__
    package = parts[0]
    if len(parts) > 1:
        final_module = parts[-1]
        return f"{package}:{final_module}.{name}"
    else:
        return f"{package}:{name}"


AUTO_MATCH_BINDINGS = [
    *[
        Binding(
            cmd, [key], "focused_insert & auto_match & followed_by_closing_paren_or_end"
        )
        for key, cmd in match.auto_match_parens.items()
    ],
    *[
        # raw string
        Binding(cmd, [key], "focused_insert & auto_match & preceded_by_raw_str_prefix")
        for key, cmd in match.auto_match_parens_raw_string.items()
    ],
    Binding(
        match.double_quote,
        ['"'],
        "focused_insert"
        " & auto_match"
        " & not_inside_unclosed_string"
        " & preceded_by_paired_double_quotes"
        " & followed_by_closing_paren_or_end",
    ),
    Binding(
        match.single_quote,
        ["'"],
        "focused_insert"
        " & auto_match"
        " & not_inside_unclosed_string"
        " & preceded_by_paired_single_quotes"
        " & followed_by_closing_paren_or_end",
    ),
    Binding(
        match.docstring_double_quotes,
        ['"'],
        "focused_insert"
        " & auto_match"
        " & not_inside_unclosed_string"
        " & preceded_by_two_double_quotes",
    ),
    Binding(
        match.docstring_single_quotes,
        ["'"],
        "focused_insert"
        " & auto_match"
        " & not_inside_unclosed_string"
        " & preceded_by_two_single_quotes",
    ),
    Binding(
        match.skip_over,
        [")"],
        "focused_insert & auto_match & followed_by_closing_round_paren",
    ),
    Binding(
        match.skip_over,
        ["]"],
        "focused_insert & auto_match & followed_by_closing_bracket",
    ),
    Binding(
        match.skip_over,
        ["}"],
        "focused_insert & auto_match & followed_by_closing_brace",
    ),
    Binding(
        match.skip_over, ['"'], "focused_insert & auto_match & followed_by_double_quote"
    ),
    Binding(
        match.skip_over, ["'"], "focused_insert & auto_match & followed_by_single_quote"
    ),
    Binding(
        match.delete_pair,
        ["backspace"],
        "focused_insert"
        " & preceded_by_opening_round_paren"
        " & auto_match"
        " & followed_by_closing_round_paren",
    ),
    Binding(
        match.delete_pair,
        ["backspace"],
        "focused_insert"
        " & preceded_by_opening_bracket"
        " & auto_match"
        " & followed_by_closing_bracket",
    ),
    Binding(
        match.delete_pair,
        ["backspace"],
        "focused_insert"
        " & preceded_by_opening_brace"
        " & auto_match"
        " & followed_by_closing_brace",
    ),
    Binding(
        match.delete_pair,
        ["backspace"],
        "focused_insert"
        " & preceded_by_double_quote"
        " & auto_match"
        " & followed_by_double_quote",
    ),
    Binding(
        match.delete_pair,
        ["backspace"],
        "focused_insert"
        " & preceded_by_single_quote"
        " & auto_match"
        " & followed_by_single_quote",
    ),
]

AUTO_SUGGEST_BINDINGS = [
    # there are two reasons for re-defining bindings defined upstream:
    # 1) prompt-toolkit does not execute autosuggestion bindings in vi mode,
    # 2) prompt-toolkit checks if we are at the end of text, not end of line
    #    hence it does not work in multi-line mode of navigable provider
    Binding(
        auto_suggest.accept_or_jump_to_end,
        ["end"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept_or_jump_to_end,
        ["c-e"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept,
        ["c-f"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept,
        ["right"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode & is_cursor_at_the_end_of_line",
    ),
    Binding(
        auto_suggest.accept_word,
        ["escape", "f"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept_token,
        ["c-right"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.discard,
        ["escape"],
        # note this one is using `emacs_insert_mode`, not `emacs_like_insert_mode`
        # as in `vi_insert_mode` we do not want `escape` to be shadowed (ever).
        "has_suggestion & default_buffer_focused & emacs_insert_mode",
    ),
    Binding(
        auto_suggest.discard,
        ["delete"],
        "has_suggestion & default_buffer_focused & emacs_insert_mode",
    ),
    Binding(
        auto_suggest.swap_autosuggestion_up,
        ["c-up"],
        "navigable_suggestions"
        " & ~has_line_above"
        " & has_suggestion"
        " & default_buffer_focused",
    ),
    Binding(
        auto_suggest.swap_autosuggestion_down,
        ["c-down"],
        "navigable_suggestions"
        " & ~has_line_below"
        " & has_suggestion"
        " & default_buffer_focused",
    ),
    Binding(
        auto_suggest.up_and_update_hint,
        ["c-up"],
        "has_line_above & navigable_suggestions & default_buffer_focused",
    ),
    Binding(
        auto_suggest.down_and_update_hint,
        ["c-down"],
        "has_line_below & navigable_suggestions & default_buffer_focused",
    ),
    Binding(
        auto_suggest.accept_character,
        ["escape", "right"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept_and_move_cursor_left,
        ["c-left"],
        "has_suggestion & default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.accept_and_keep_cursor,
        ["escape", "down"],
        "has_suggestion & default_buffer_focused & emacs_insert_mode",
    ),
    Binding(
        auto_suggest.backspace_and_resume_hint,
        ["backspace"],
        # no `has_suggestion` here to allow resuming if no suggestion
        "default_buffer_focused & emacs_like_insert_mode",
    ),
    Binding(
        auto_suggest.resume_hinting,
        ["right"],
        "is_cursor_at_the_end_of_line"
        " & default_buffer_focused"
        " & emacs_like_insert_mode"
        " & pass_through",
    ),
]


SIMPLE_CONTROL_BINDINGS = [
    Binding(cmd, [key], "vi_insert_mode & default_buffer_focused & ebivim")
    for key, cmd in {
        "c-a": nc.beginning_of_line,
        "c-b": nc.backward_char,
        "c-k": nc.kill_line,
        "c-w": nc.backward_kill_word,
        "c-y": nc.yank,
        "c-_": nc.undo,
    }.items()
]


ALT_AND_COMOBO_CONTROL_BINDINGS = [
    Binding(cmd, list(keys), "vi_insert_mode & default_buffer_focused & ebivim")
    for keys, cmd in {
        # Control Combos
        ("c-x", "c-e"): nc.edit_and_execute,
        ("c-x", "e"): nc.edit_and_execute,
        # Alt
        ("escape", "b"): nc.backward_word,
        ("escape", "c"): nc.capitalize_word,
        ("escape", "d"): nc.kill_word,
        ("escape", "h"): nc.backward_kill_word,
        ("escape", "l"): nc.downcase_word,
        ("escape", "u"): nc.uppercase_word,
        ("escape", "y"): nc.yank_pop,
        ("escape", "."): nc.yank_last_arg,
    }.items()
]


def add_binding(bindings: KeyBindings, binding: Binding):
    bindings.add(
        *binding.keys,
        **({"filter": binding.filter} if binding.filter is not None else {}),
    )(binding.command)


def create_ipython_shortcuts(shell, skip=None) -> KeyBindings:
    """Set up the prompt_toolkit keyboard shortcuts for IPython.

    Parameters
    ----------
    shell: InteractiveShell
        The current IPython shell Instance
    skip: List[Binding]
        Bindings to skip.

    Returns
    -------
    KeyBindings
        the keybinding instance for prompt toolkit.

    """
    kb = KeyBindings()
    skip = skip or []
    for binding in KEY_BINDINGS:
        skip_this_one = False
        for to_skip in skip:
            if (
                to_skip.command == binding.command
                and to_skip.filter == binding.filter
                and to_skip.keys == binding.keys
            ):
                skip_this_one = True
                break
        if skip_this_one:
            continue
        add_binding(kb, binding)

    def get_input_mode(self):
        app = get_app()
        app.ttimeoutlen = shell.ttimeoutlen
        app.timeoutlen = shell.timeoutlen

        return self._input_mode

    def set_input_mode(self, mode):
        shape = {InputMode.NAVIGATION: 2, InputMode.REPLACE: 4}.get(mode, 6)
        cursor = "\x1b[{} q".format(shape)

        sys.stdout.write(cursor)
        sys.stdout.flush()

        self._input_mode = mode

    if shell.editing_mode == "vi" and shell.modal_cursor:
        ViState._input_mode = InputMode.INSERT  # type: ignore
        ViState.input_mode = property(get_input_mode, set_input_mode)  # type: ignore

    return kb


def reformat_and_execute(event):
    """Reformat code and execute it"""
    shell = get_ipython()
    reformat_text_before_cursor(
        event.current_buffer, event.current_buffer.document, shell
    )
    event.current_buffer.validate_and_handle()


def reformat_text_before_cursor(buffer, document, shell):
    text = buffer.delete_before_cursor(len(document.text[: document.cursor_position]))
    try:
        formatted_text = shell.reformat_handler(text)
        buffer.insert_text(formatted_text)
    except Exception as e:
        buffer.insert_text(text)


def handle_return_or_newline_or_execute(event):
    shell = get_ipython()
    if getattr(shell, "handle_return", None):
        return shell.handle_return(shell)(event)
    else:
        return newline_or_execute_outer(shell)(event)


def newline_or_execute_outer(shell):
    def newline_or_execute(event):
        """When the user presses return, insert a newline or execute the code."""
        b = event.current_buffer
        d = b.document

        if b.complete_state:
            cc = b.complete_state.current_completion
            if cc:
                b.apply_completion(cc)
            else:
                b.cancel_completion()
            return

        # If there's only one line, treat it as if the cursor is at the end.
        # See https://github.com/ipython/ipython/issues/10425
        if d.line_count == 1:
            check_text = d.text
        else:
            check_text = d.text[: d.cursor_position]
        status, indent = shell.check_complete(check_text)

        # if all we have after the cursor is whitespace: reformat current text
        # before cursor
        after_cursor = d.text[d.cursor_position :]
        reformatted = False
        if not after_cursor.strip():
            reformat_text_before_cursor(b, d, shell)
            reformatted = True
        if not (
            d.on_last_line
            or d.cursor_position_row >= d.line_count - d.empty_line_count_at_the_end()
        ):
            if shell.autoindent:
                b.insert_text("\n" + indent)
            else:
                b.insert_text("\n")
            return

        if (status != "incomplete") and b.accept_handler:
            if not reformatted:
                reformat_text_before_cursor(b, d, shell)
            b.validate_and_handle()
        else:
            if shell.autoindent:
                b.insert_text("\n" + indent)
            else:
                b.insert_text("\n")

    return newline_or_execute


def previous_history_or_previous_completion(event):
    """
    Control-P in vi edit mode on readline is history next, unlike default prompt toolkit.

    If completer is open this still select previous completion.
    """
    event.current_buffer.auto_up()


def next_history_or_next_completion(event):
    """
    Control-N in vi edit mode on readline is history previous, unlike default prompt toolkit.

    If completer is open this still select next completion.
    """
    event.current_buffer.auto_down()


def dismiss_completion(event):
    """Dismiss completion"""
    b = event.current_buffer
    if b.complete_state:
        b.cancel_completion()


def reset_buffer(event):
    """Reset buffer"""
    b = event.current_buffer
    if b.complete_state:
        b.cancel_completion()
    else:
        b.reset()


def reset_search_buffer(event):
    """Reset search buffer"""
    if event.current_buffer.document.text:
        event.current_buffer.reset()
    else:
        event.app.layout.focus(DEFAULT_BUFFER)


def suspend_to_bg(event):
    """Suspend to background"""
    event.app.suspend_to_background()


def quit(event):
    """
    Quit application with ``SIGQUIT`` if supported or ``sys.exit`` otherwise.

    On platforms that support SIGQUIT, send SIGQUIT to the current process.
    On other platforms, just exit the process with a message.
    """
    sigquit = getattr(signal, "SIGQUIT", None)
    if sigquit is not None:
        os.kill(0, signal.SIGQUIT)
    else:
        sys.exit("Quit")


def indent_buffer(event):
    """Indent buffer"""
    event.current_buffer.insert_text(" " * 4)


def newline_autoindent(event):
    """Insert a newline after the cursor indented appropriately.

    Fancier version of former ``newline_with_copy_margin`` which should
    compute the correct indentation of the inserted line. That is to say, indent
    by 4 extra space after a function definition, class definition, context
    manager... And dedent by 4 space after ``pass``, ``return``, ``raise ...``.
    """
    shell = get_ipython()
    inputsplitter = shell.input_transformer_manager
    b = event.current_buffer
    d = b.document

    if b.complete_state:
        b.cancel_completion()
    text = d.text[: d.cursor_position] + "\n"
    _, indent = inputsplitter.check_complete(text)
    b.insert_text("\n" + (" " * (indent or 0)), move_cursor=False)


def open_input_in_editor(event):
    """Open code from input in external editor"""
    event.app.current_buffer.open_in_editor()


if sys.platform == "win32":
    from IPython.core.error import TryNext
    from IPython.lib.clipboard import (
        ClipboardEmpty,
        tkinter_clipboard_get,
        win32_clipboard_get,
    )

    @undoc
    def win_paste(event):
        try:
            text = win32_clipboard_get()
        except TryNext:
            try:
                text = tkinter_clipboard_get()
            except (TryNext, ClipboardEmpty):
                return
        except ClipboardEmpty:
            return
        event.current_buffer.insert_text(text.replace("\t", " " * 4))

else:

    @undoc
    def win_paste(event):
        """Stub used on other platforms"""
        pass


KEY_BINDINGS = [
    Binding(
        handle_return_or_newline_or_execute,
        ["enter"],
        "default_buffer_focused & ~has_selection & insert_mode",
    ),
    Binding(
        reformat_and_execute,
        ["escape", "enter"],
        "default_buffer_focused & ~has_selection & insert_mode & ebivim",
    ),
    Binding(quit, ["c-\\"]),
    Binding(
        previous_history_or_previous_completion,
        ["c-p"],
        "vi_insert_mode & default_buffer_focused",
    ),
    Binding(
        next_history_or_next_completion,
        ["c-n"],
        "vi_insert_mode & default_buffer_focused",
    ),
    Binding(dismiss_completion, ["c-g"], "default_buffer_focused & has_completions"),
    Binding(reset_buffer, ["c-c"], "default_buffer_focused"),
    Binding(reset_search_buffer, ["c-c"], "search_buffer_focused"),
    Binding(suspend_to_bg, ["c-z"], "supports_suspend"),
    Binding(
        indent_buffer,
        ["tab"],  # Ctrl+I == Tab
        "default_buffer_focused & ~has_selection & insert_mode & cursor_in_leading_ws",
    ),
    Binding(newline_autoindent, ["c-o"], "default_buffer_focused & emacs_insert_mode"),
    Binding(open_input_in_editor, ["f2"], "default_buffer_focused"),
    *AUTO_MATCH_BINDINGS,
    *AUTO_SUGGEST_BINDINGS,
    Binding(
        display_completions_like_readline,
        ["c-i"],
        "readline_like_completions"
        " & default_buffer_focused"
        " & ~has_selection"
        " & insert_mode"
        " & ~cursor_in_leading_ws",
    ),
    Binding(win_paste, ["c-v"], "default_buffer_focused & ~vi_mode & is_windows_os"),
    *SIMPLE_CONTROL_BINDINGS,
    *ALT_AND_COMOBO_CONTROL_BINDINGS,
]

UNASSIGNED_ALLOWED_COMMANDS = [
    auto_suggest.llm_autosuggestion,
    nc.beginning_of_buffer,
    nc.end_of_buffer,
    nc.end_of_line,
    nc.forward_char,
    nc.forward_word,
    nc.unix_line_discard,
]
