"""Remembering where the pet was left — and refusing to when that's a trap."""

import json
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from bolt_pet import window_state


def test_a_saved_position_comes_back(tmp_path):
    path = tmp_path / "window.json"
    window_state.save(1200, 640, path)
    assert window_state.load(path) == (1200, 640)


def test_no_file_yet_is_not_an_error(tmp_path):
    assert window_state.load(tmp_path / "nope.json") is None


def test_a_corrupt_file_falls_back_to_the_default_corner(tmp_path):
    """Whatever is in there, the pet still has to start."""
    path = tmp_path / "window.json"
    for junk in ("", "{", "null", "[]", '{"x": "left"}', '{"y": 3}'):
        path.write_text(junk)
        assert window_state.load(path) is None


def test_saving_creates_the_cache_directory(tmp_path):
    path = tmp_path / "deep" / "nested" / "window.json"
    window_state.save(10, 20, path)
    assert window_state.load(path) == (10, 20)


def test_an_unwritable_location_is_swallowed(tmp_path):
    """A read-only cache dir is a reason to forget the position, not to crash
    on every drag."""
    window_state.save(1, 2, tmp_path / "no" / "\0bad" / "window.json")


def test_the_write_is_atomic_and_leaves_no_litter(tmp_path):
    path = tmp_path / "window.json"
    window_state.save(5, 5, path)
    window_state.save(7, 7, path)
    assert json.loads(path.read_text()) == {"x": 7, "y": 7}
    assert [p.name for p in tmp_path.iterdir()] == ["window.json"]


# ── validating against the screens that exist *now* ─────────────────────────

LAPTOP = (0, 0, 1920, 1080)
EXTERNAL = (1920, 0, 4480, 1440)


def test_a_position_on_a_connected_screen_is_kept():
    assert window_state.is_visible_on(1700, 900, 128, [LAPTOP])


def test_a_position_on_an_unplugged_monitor_is_refused():
    """The dangerous case: restoring it faithfully puts the pet somewhere you
    can't see or reach."""
    assert not window_state.is_visible_on(3000, 700, 128, [LAPTOP])
    assert window_state.is_visible_on(3000, 700, 128, [LAPTOP, EXTERNAL])


def test_mostly_off_screen_counts_as_gone():
    """A few pixels of ear poking onto the desktop is not "reachable"."""
    assert not window_state.is_visible_on(1910, 500, 128, [LAPTOP])
    assert window_state.is_visible_on(1830, 500, 128, [LAPTOP])


def test_touching_an_edge_is_not_overlapping():
    assert not window_state.is_visible_on(1920, 0, 128, [LAPTOP])


def test_negative_coordinates_are_fine_when_a_screen_is_there():
    """Monitors left of or above the primary have negative origins."""
    left_of_primary = (-1920, 0, 0, 1080)
    assert window_state.is_visible_on(-900, 400, 128, [left_of_primary, LAPTOP])


def test_no_screens_at_all_is_not_visible():
    assert not window_state.is_visible_on(100, 100, 128, [])