from __future__ import annotations
import re
from typing import TYPE_CHECKING
from ..items.Folder import Folder
from ..core.Prompt import Prompt

if TYPE_CHECKING:
    from .App import App

BACKSPACE_KEYS = ("KEY_BACKSPACE", "\x7f", "\x08")
ENTER_KEYS = ("\n", "KEY_ENTER")
ESCAPE_KEY = "\x1b"


class Input:
    def __init__(self, app: App) -> None:
        self._app = app
        self._actions = {
            "quit": self._quit,
            "down": self._down,
            "up": self._up,
            "enter": self._enter,
            "back": self._back,
            "parent": self._parent,
            "sort_direction": self._sort_direction,
            "sort_grouping": self._sort_grouping,
            "new_folder": self._new_folder,
            "delete_folder": self._delete_folder,
            "new_file": self._new_file,
            "search": self._search,
            "search_next": self._search_next,
            "search_previous": self._search_previous,
        }

    def handle(self, key: str) -> bool:
        if self.app.prompt is not None:
            return self._handle_prompt(key)
        action = self.app.config.action_for(key)
        handler = self._actions.get(action)
        return handler() if handler else True

    def _handle_prompt(self, key: str) -> bool:
        prompt = self.app.prompt

        if prompt.kind == "error":
            self.app.close_prompt()
            prompt.on_submit(None)
            return True

        if prompt.kind == "confirm":
            if key in ("y", "Y"):
                self.app.close_prompt()
                prompt.on_submit(True)
            elif key in ("n", "N", ESCAPE_KEY):
                self.app.close_prompt()
            return True

        if key in ENTER_KEYS:
            self.app.close_prompt()
            prompt.on_submit(prompt.buffer)
        elif key == ESCAPE_KEY:
            self.app.close_prompt()
        elif key in BACKSPACE_KEYS:
            prompt.buffer = prompt.buffer[:-1]
        elif len(key) == 1 and key.isprintable():
            prompt.buffer += key
        return True

    def _quit(self) -> bool:
        return False

    def _down(self) -> bool:
        navigator = self.app.navigator
        navigator.cursor.down(len(navigator.items))
        return True

    def _up(self) -> bool:
        self.app.navigator.cursor.up()
        return True

    def _maybe_show_error(self) -> None:
        error = self.app.navigator.error
        if error:
            self.app.open_prompt(Prompt.error(error))

    def _enter(self) -> bool:
        navigator = self.app.navigator
        items = navigator.items
        if items:
            navigator.enter(items[navigator.cursor.pos])
            self._maybe_show_error()
        return True

    def _back(self) -> bool:
        self.app.navigator.back()
        self._maybe_show_error()
        return True

    def _parent(self) -> bool:
        self.app.navigator.up()
        self._maybe_show_error()
        return True

    def _sort_direction(self) -> bool:
        self.app.navigator.cycle_sort_direction()
        return True

    def _sort_grouping(self) -> bool:
        self.app.navigator.cycle_sort_grouping()
        return True

    def _new_folder(self) -> bool:
        navigator = self.app.navigator

        def on_submit(name: str) -> None:
            if not name:
                return
            try:
                self.app.file_actions.create_folder(navigator.current.path,
                                                      name)
            except OSError as e:
                self.app.open_prompt(Prompt.error(str(e)))

        self.app.open_prompt(Prompt("New folder name: ", "text", on_submit))
        return True

    def _delete_folder(self) -> bool:
        navigator = self.app.navigator
        items = navigator.items
        if not items:
            return True
        item = items[navigator.cursor.pos]
        if not isinstance(item, Folder):
            return True

        def on_confirm(confirmed: bool) -> None:
            if not confirmed:
                return
            try:
                self.app.file_actions.delete_folder(item.path)
            except OSError as e:
                self.app.open_prompt(Prompt.error(str(e)))

        self.app.open_prompt(
            Prompt(f"Delete '{item.name}'? (y/n) ", "confirm", on_confirm))
        return True

    def _new_file(self) -> bool:
        navigator = self.app.navigator

        def on_submit(name: str) -> None:
            if not name:
                return
            try:
                self.app.file_actions.create_file(navigator.current.path,
                                                   name)
            except OSError as e:
                self.app.open_prompt(Prompt.error(str(e)))

        self.app.open_prompt(Prompt("New file name: ", "text", on_submit))
        return True

    def _search(self) -> bool:
        navigator = self.app.navigator

        def on_submit(pattern: str) -> None:
            if not pattern:
                return
            try:
                regex = re.compile(pattern)
            except re.error as e:
                self.app.open_prompt(Prompt.error(f"Invalid regex: {e}"))
                return
            if not navigator.search(regex):
                self.app.open_prompt(Prompt.error(f"No match: {pattern}"))

        self.app.open_prompt(Prompt("Search: ", "text", on_submit))
        return True

    def _search_next(self) -> bool:
        navigator = self.app.navigator
        if navigator.last_pattern is None:
            return True
        if not navigator.search_next():
            self.app.open_prompt(Prompt.error(f"No match: {navigator.last_pattern}"))
        return True

    def _search_previous(self) -> bool:
        navigator = self.app.navigator
        if navigator.last_pattern is None:
            return True
        if not navigator.search_previous():
            self.app.open_prompt(Prompt.error(f"No match: {navigator.last_pattern}"))
        return True

    @property
    def app(self) -> App:
        return self._app