import curses

class CursesAdapter:
    def __init__(self) -> None:
        self.KEY_BACKSPACE_2 = 8
        self.KEY_ENTER = 10
        self.KEY_CTRL_S = 19
        self.KEY_ESCAPE = 27
        self.KEY_DOLLAR = 36
        self.KEY_NULL = 48
        self.KEY_TWO_DOTS = 59
        self.KEY_G = 71
        self.KEY_XOR = 94
        self.KEY_b = 98
        self.KEY_d = 100
        self.KEY_g = 103
        self.KEY_p = 112
        self.KEY_w = 119
        self.KEY_x = 120
        self.KEY_y = 121
        self.KEY_BACKSPACE_1 = 127
        self.KEY_LEFT = curses.KEY_LEFT
        self.KEY_RIGHT = curses.KEY_RIGHT
        self.KEY_UP = curses.KEY_UP
        self.KEY_DOWN = curses.KEY_DOWN
        self.KEY_PG_UP = 450
        self.KEY_PG_DOWN = 456


        self.screen = curses.initscr()
        self.screen.keypad(True)
        self.cols = curses.COLS
        self.lines = curses.LINES
        curses.curs_set(1)  # Make cursor visible

    def Refresh(self) -> None:
        """Apply changes"""
        self.screen.refresh()

    def Cleanup(self) -> None:
        curses.endwin()

    def SetCursor(self, x: int, y: int):
        """set cursor position (x, y)"""
        self.screen.move(x, y)

    def SetChar(self, x: int, y: int, code: int):
        """set char position (x, y)"""
        self.screen.addch(x, y, code)

    def SetString(self, x: int, y: int, data: str):
        """set string begin position (x, y)""" 
        self.screen.addstr(x, y, data)

    def GetChar(self) -> int:
        """Wait users input"""
        return self.screen.getch()
    

class VimView:
    def __init__(self, adapter: CursesAdapter) -> None:
        self.curses_adapter = adapter

    
    def Render(self, 
               displayBuffer: list[list[str]],
               currentLine: int, currentCol: int,
               scrollX: int, scrollY: int,
               modeBarData: str):
        """Отрисовка текущего состояния"""

        self.curses_adapter.screen.clear()

        # Отображение видимой части текста
        for i in range(self.curses_adapter.lines - 1):
            if i + scrollY < len(displayBuffer):
                line = ''.join(displayBuffer[i + scrollY])
                if scrollX < len(line):
                    self.curses_adapter.SetString(i, 0, line[scrollX:scrollX + self.curses_adapter.cols])
                else:
                    self.curses_adapter.SetString(i, 0, '')
            else:
                self.curses_adapter.SetString(i, 0, '')

        # Обновление панели режима
        self.SetModeBar(modeBarData)

        # Установка курсора с учетом прокрутки
        cursor_x = currentLine - scrollY
        cursor_y = currentCol - scrollX

        # Проверка, чтобы курсор не вышел за пределы экрана
        if 0 <= cursor_x < self.curses_adapter.lines - 1 and 0 <= cursor_y < self.curses_adapter.cols:
            self.curses_adapter.SetCursor(cursor_x, cursor_y)

        self.curses_adapter.Refresh()

    def SetModeBar(self, modeBarData: str):
        """Print edit mode information panel"""
        if len(modeBarData) > self.curses_adapter.cols - 1:
            scrollX = len(modeBarData)-self.curses_adapter.cols
            self.curses_adapter.SetString(self.curses_adapter.lines - 1, 0, modeBarData[scrollX+1:])
        else:
            self.curses_adapter.SetString(self.curses_adapter.lines - 1, 0, modeBarData)