from __future__ import annotations
import stat
from typing import TYPE_CHECKING
import curses
from ..items.Symlink import Symlink
from ..items.AItems import AItem

if TYPE_CHECKING:
    from .App import App


class UI:
    def __init__(self, app: App):
        self._app = app

    def _get_attr(self, item: any, i: int) -> str:
        attr = curses.color_pair(item.color_pair)
        if i == self.app.cursor.pos:
            attr |= curses.A_REVERSE
        return attr

    def render(self, stdscr: curses.window) -> None:
        height, width = stdscr.getmaxyx()
        for i in range(min(height, len(self.app.items))):
            item = self.app.items[i]
            self._render_item(stdscr, item, i, width)

    ARROW = " -> "
    ARROW_LEN = len(ARROW)
    def _render_item(self, stdscr: curses.window, item: AItem, i: int, width: int) -> None:
        name, size, perm = item.fields()
        name_len = len(name)
        col_width = int(width / 3)

        attr = self._get_attr(item, i)
        stdscr.addstr(i, 0, name.ljust(col_width), attr)

        if type(item) is Symlink:
            attr_arrow = curses.color_pair(0)
            attr_target = curses.color_pair(Symlink.target_color(item.point_to))
            if i == self.app.cursor.pos:
                attr_arrow |= curses.A_REVERSE
                attr_target |= curses.A_REVERSE
            stdscr.addstr(i, name_len, self.ARROW, attr_arrow)
            stdscr.addstr(i, name_len + self.ARROW_LEN, str(item.point_to), attr_target)

        stdscr.addstr(i, col_width, str(size).ljust(col_width * 2), attr)
        stdscr.addstr(i, col_width * 2, stat.filemode(perm), attr)

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