from unittest.mock import MagicMock
import curses as _curses

# Stub just enough of the curses API for InputField to import
_curses.color_pair   = lambda x: 0
_curses.A_UNDERLINE  = 0
_curses.A_BOLD       = 0
_curses.KEY_BACKSPACE = 263
_curses.KEY_LEFT     = 260
_curses.KEY_RIGHT    = 261
_curses.KEY_HOME     = 262
_curses.KEY_END      = 360
_curses.KEY_DC       = 330

from openvpncertupdate import InputField, clamp


def _field(initial="", mask=False):
    win = MagicMock()
    win.getmaxyx.return_value = (1, 80)
    return InputField(win, 0, 0, 40, initial=initial, mask=mask)


def test_initial_value():
    assert _field("hello").value == "hello"

def test_backspace_removes_last():
    f = _field("hello")
    f.handle_key(_curses.KEY_BACKSPACE)
    assert f.value == "hell"

def test_type_appends():
    f = _field("hi")
    f.handle_key(ord("!"))
    assert f.value == "hi!"

def test_left_then_insert():
    f = _field("ac")
    f.handle_key(_curses.KEY_LEFT)
    f.handle_key(_curses.KEY_LEFT)
    f.handle_key(ord("b"))
    assert f.value == "bac"

def test_delete_key():
    f = _field("abc")
    f.handle_key(_curses.KEY_HOME)
    f.handle_key(_curses.KEY_DC)
    assert f.value == "bc"

def test_clamp_bounds():
    assert clamp(5, 0, 10) == 5
    assert clamp(-1, 0, 10) == 0
    assert clamp(11, 0, 10) == 10