from abc import ABC, abstractmethod
from mvc.views import CursesAdapter
from mvc.models import VimModel, ReturnCode

def isAscii(symbolCode: int) -> bool:
    return 32 <= symbolCode <= 126

class BaseStrategy(ABC):
    def __init__(self, model: VimModel, adapter: CursesAdapter, mode: str):
        self.model = model
        self.adapter = adapter
        self.mode = model.mode = mode

    def handle_common_input(self, symbolCode: int) -> int:
        """Обработка общих для всех стратегий действий"""
        match symbolCode:
            case self.adapter.KEY_ESCAPE: return ReturnCode.SET_BASIC_MODE
            case self.adapter.KEY_LEFT: self.model.MoveLeft()
            case self.adapter.KEY_RIGHT: self.model.MoveRight()
            case self.adapter.KEY_UP: self.model.MoveUp()
            case self.adapter.KEY_DOWN: self.model.MoveDown()
            case self.adapter.KEY_CTRL_S: self.model.SaveFile()
            case _: return ReturnCode.CONTINUE  # Не обрабатываем, передаем дальше

        self.model.Scroll(self.adapter.lines, self.adapter.cols)
        return ReturnCode.GOOD

    @abstractmethod
    def HandleInput(self, symbolCode: int) -> int:
        pass

class Controller:
    def __init__(self, strategy: BaseStrategy):
        self.strategy = strategy

    def SetStrategy(self, strategy: BaseStrategy):
        self.strategy = strategy

    def HandleInput(self, symbolCode: int):
        return self.strategy.HandleInput(symbolCode)

class CommandStrategy(BaseStrategy):
    """Режим ввода команд"""
    def __init__(self, model: VimModel, adapter: CursesAdapter):
        super().__init__(model, adapter, mode="COMMAND")

    def HandleInput(self, symbolCode) -> int:
        """Обработка ввода пользователя"""
        result = self.handle_common_input(symbolCode)
        if result != ReturnCode.CONTINUE: return result

        match symbolCode:
            case self.adapter.KEY_ENTER: 
                code = self.model.EnterCommand()
                self.model.Scroll(self.adapter.lines, self.adapter.cols)
                return code
            case self.adapter.KEY_BACKSPACE_1 | self.adapter.KEY_BACKSPACE_2: 
                self.model.BackspaceCommand()
            case _: 
                if not isAscii(symbolCode): return ReturnCode.GOOD
                self.model.InsertCommandSymbol(symbolCode)

        self.model.Scroll(self.adapter.lines, self.adapter.cols)
        return ReturnCode.GOOD

class EditStrategy(BaseStrategy):
    """Режим редактирования"""
    def __init__(self, model: VimModel, adapter: CursesAdapter):
        super().__init__(model, adapter, mode="EDIT")

    def HandleInput(self, symbolCode) -> int:
        """Обработка ввода пользователя"""
        result = self.handle_common_input(symbolCode)
        if result != ReturnCode.CONTINUE: return result

        match symbolCode:
            case self.adapter.KEY_ENTER: self.model.Enter()
            case self.adapter.KEY_BACKSPACE_1 | self.adapter.KEY_BACKSPACE_2: 
                self.model.Backspace()
            case _:
                if not isAscii(symbolCode): return ReturnCode.GOOD
                self.model.InsertSymbol(symbolCode)

        self.model.Scroll(self.adapter.lines, self.adapter.cols)
        return ReturnCode.GOOD

class NormalStrategy(BaseStrategy):
    """Режим навигации"""
    def __init__(self, model: VimModel, adapter: CursesAdapter):
        super().__init__(model, adapter, mode="NORMAL")

    def HandleInput(self, symbolCode) -> int:
        """Обработка ввода пользователя"""
        result = self.handle_common_input(symbolCode)
        if result != ReturnCode.CONTINUE: return result

        match symbolCode:
            case self.adapter.KEY_TWO_DOTS: return ReturnCode.SET_COMMAND_MODE

        self.model.Scroll(self.adapter.lines, self.adapter.cols)
        return ReturnCode.GOOD