"""Tests for TUI DIALOGS (show_confirm, show_cert_form).

Uses the same mock-curses approach as test_widgets.py — no real terminal needed.
"""
from unittest.mock import MagicMock, patch
import curses as _curses

# Stub curses constants before importing the module under test, mirroring
# what test_widgets.py does for InputField's dependencies.
_curses.color_pair   = lambda x: 0
_curses.curs_set     = lambda x: None
_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
_curses.KEY_BTAB     = 353
_curses.KEY_F5       = 269
_curses.KEY_ENTER    = 343

from openvpncertupdate import show_confirm, show_cert_form, CertFormResult


def _make_stdscr(rows=40, cols=120):
    """Return a minimal MagicMock that looks like a curses stdscr."""
    stdscr = MagicMock()
    stdscr.getmaxyx.return_value = (rows, cols)
    return stdscr


def _make_win(rows=20, cols=60):
    """Return a minimal MagicMock for the subwindow created by curses.newwin."""
    win = MagicMock()
    win.getmaxyx.return_value = (rows, cols)
    return win


# ---------------------------------------------------------------------------
# show_confirm tests
# ---------------------------------------------------------------------------

def test_show_confirm_yes():
    """Pressing 'y' returns True."""
    stdscr = _make_stdscr()
    win = _make_win()
    win.getch.side_effect = [ord("y")]
    with patch("curses.newwin", return_value=win):
        result = show_confirm(stdscr, "Do you want to continue?")
    assert result is True


def test_show_confirm_esc():
    """Pressing Escape (27) returns False."""
    stdscr = _make_stdscr()
    win = _make_win()
    win.getch.side_effect = [27]
    with patch("curses.newwin", return_value=win):
        result = show_confirm(stdscr, "Do you want to continue?")
    assert result is False


def test_show_confirm_clamps_width_to_screen_for_long_line():
    """A long message line (e.g. a Cryptgeon password URL) must not make the
    requested newwin() width exceed the screen — that's what made
    curses.newwin() raise 'curses function returned NULL' on a narrow
    terminal such as a serial console."""
    stdscr = _make_stdscr(rows=24, cols=80)
    win = _make_win()
    win.getch.side_effect = [ord("y")]
    long_url = "https://cryptgeon.example.com/note/" + "a" * 100 + "#" + "b" * 64
    with patch("curses.newwin", return_value=win) as mock_newwin:
        show_confirm(stdscr, f"Send email?\n\nPassword URL: {long_url}")
    h, w, y, x = mock_newwin.call_args.args
    assert w <= 80
    assert x >= 0


def test_show_confirm_newwin_failure_returns_false():
    """If curses.newwin() still fails despite clamping, show_confirm must
    degrade to 'declined' rather than crash the whole app."""
    stdscr = _make_stdscr()
    with patch("curses.newwin", side_effect=_curses.error("returned NULL")):
        result = show_confirm(stdscr, "Do you want to continue?")
    assert result is False


# ---------------------------------------------------------------------------
# show_cert_form tests
# ---------------------------------------------------------------------------

def test_show_cert_form_cancel():
    """Pressing Escape returns a CertFormResult with confirmed=False."""
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [27]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="alice", email="alice@example.com")
    assert isinstance(result, CertFormResult)
    assert result.confirmed is False


def test_show_cert_form_uses_erase_not_clear():
    # clear() forces a full-screen repaint on every refresh(); the form
    # redraws on every keystroke, so it must use erase() instead.
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [9, 27]  # Tab, then Escape
    with patch("curses.newwin", return_value=win):
        show_cert_form(stdscr, cn="alice", email="alice@example.com")
    assert win.erase.called
    assert not win.clear.called


def test_show_cert_form_confirm():
    """Enter advances through the 4 fields to the Continue button; Enter on
    Continue confirms.  That's 5 Enter keypresses total.

    days="90" (non-blank) is used deliberately: a blank default would still
    read back as "" even from a reverted three-field form (CertFormResult.days
    defaults to ""), so it would not actually prove the days field was
    traversed. A non-blank value only round-trips if the days field exists,
    was reached by the Enter sequence, and was carried into the result."""
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [10, 10, 10, 10, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="bob@example.com", days="90")
    assert isinstance(result, CertFormResult)
    assert result.confirmed is True
    assert result.cn == "bob"
    assert result.email == "bob@example.com"
    assert result.days == "90"
    assert len(result.password) > 0
    # Pins the field count itself: a partial reversion that drops "days"
    # from _FORM_FIELDS while CertFormResult/_submit() keep it would still
    # round-trip days="90" above (it's passed straight through, untraversed),
    # but would only consume 4 Enters, not 5.
    assert win.getch.call_count == 5


def test_show_cert_form_cancel_button():
    """Tab to the Cancel button (5 Tabs from start) and press Enter cancels."""
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    # Tab×5: cn→email→days→password→Continue→Cancel, then Enter
    win.getch.side_effect = [9, 9, 9, 9, 9, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="alice", email="alice@example.com")
    assert isinstance(result, CertFormResult)
    assert result.confirmed is False


def test_show_cert_form_clamps_to_narrow_screen():
    """The form's fixed 15x62 size must not exceed a smaller-than-usual
    screen, which would make curses.newwin() raise."""
    stdscr = _make_stdscr(rows=10, cols=40)
    win = _make_win()
    win.getch.side_effect = [27]
    with patch("curses.newwin", return_value=win) as mock_newwin:
        show_cert_form(stdscr, cn="alice", email="alice@example.com")
    h, w, y, x = mock_newwin.call_args.args
    assert h <= 10
    assert w <= 40
    assert y >= 0
    assert x >= 0


def test_show_cert_form_returns_days():
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [10, 10, 10, 10, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="b@c.d", days="90")
    assert result.confirmed is True
    assert result.days == "90"


def test_show_cert_form_blank_days_means_inherit():
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [10, 10, 10, 10, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="b@c.d", days="")
    assert result.confirmed is True
    assert result.days == ""


def test_show_cert_form_days_field_is_digits_only():
    # cn is read-only here, so focus starts on email: Tab once to reach days.
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [9] + [ord(c) for c in "9a0!"] + [10, 10, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="b@c.d", days="",
                                cn_readonly=True)
    assert result.confirmed is True
    assert result.days == "90"


def test_show_cert_form_refuses_zero_days():
    # Submitting "0" must keep the form open rather than closing and failing
    # later inside EasyRSA. Enter×5 tries to submit, Esc then cancels.
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [10, 10, 10, 10, 10, 27]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="b@c.d", days="0")
    assert result.confirmed is False


def test_show_cert_form_normalises_leading_zero_days():
    stdscr = _make_stdscr()
    win = _make_win(rows=20, cols=70)
    win.getch.side_effect = [10, 10, 10, 10, 10]
    with patch("curses.newwin", return_value=win):
        result = show_cert_form(stdscr, cn="bob", email="b@c.d", days="090")
    assert result.days == "90"


def test_show_cert_form_newwin_failure_returns_cancelled():
    """If curses.newwin() still fails despite clamping, show_cert_form must
    degrade to an unconfirmed result rather than crash the whole app."""
    stdscr = _make_stdscr()
    with patch("curses.newwin", side_effect=_curses.error("returned NULL")):
        result = show_cert_form(stdscr, cn="alice", email="alice@example.com")
    assert isinstance(result, CertFormResult)
    assert result.confirmed is False