"""Regression tests for terminal navigation/focus escape sequences.

Ghostty/macOS window and tab navigation can deliver terminal focus reports
(CSI I / CSI O) to the running TUI. These must be consumed by the input parser,
not inserted into the prompt buffer and cleaned up later.
"""

from prompt_toolkit.input.vt100_parser import Vt100Parser
from prompt_toolkit.keys import Keys

from hermes_cli.pt_input_extras import install_ignored_terminal_sequences


def _parse_keys(data: str):
    events = []
    parser = Vt100Parser(events.append)
    parser.feed_and_flush(data)
    return [(event.key, event.data) for event in events]


def test_focus_events_are_parser_level_ignored_before_prompt_buffer():
    install_ignored_terminal_sequences()

    assert _parse_keys("\x1b[O\x1b[Ihello") == [
        (Keys.Ignore, "\x1b[O"),
        (Keys.Ignore, "\x1b[I"),
        ("h", "h"),
        ("e", "e"),
        ("l", "l"),
        ("l", "l"),
        ("o", "o"),
    ]


def test_regular_escape_shortcuts_still_parse_normally():
    install_ignored_terminal_sequences()

    assert _parse_keys("\x1bg") == [(Keys.Escape, "\x1b"), ("g", "g")]


def test_install_is_idempotent_and_setdefault_safe():
    """Second call should return 0 (no new mappings); existing user
    registrations must not be overwritten."""
    first = install_ignored_terminal_sequences()
    second = install_ignored_terminal_sequences()
    # At most first should be 2 (both CSI I + CSI O), second always 0
    # since the entries are now present.
    assert second == 0
    assert first in (0, 1, 2)  # 0 if a prior test in same process already installed