"""Tests for the node map: MVT decoding, projection, the braille canvas, and the tool.

The vector-tile decoder and geometry are exercised against a real cached tile fixture
(``tests/fixtures/tile_14_4843_5861.mvt``, central Montréal) so the parsing is verified end
to end without the network; the projection, canvas, and compositor are pure; the tool runs
against the :class:`MockDevice` simulator with the basemap disabled (no network in tests).
"""

from __future__ import annotations

import io
import os
import re
from pathlib import Path

import pytest
from rich.cells import cell_len
from rich.console import Console

from meshterm.core.geo import BBox, Viewport, haversine_km, lonlat_to_world, world_to_lonlat
from meshterm.core.models import (
    NODE_TYPE_REPEATER,
    Observation,
    utcnow,
)
from meshterm.core.mvt import GEOM_LINE, GEOM_POLYGON, Layer, decode_tile
from meshterm.tools.map import MapTool
from meshterm.ui.mapcanvas import MapCanvas, parse_hex

_FIXTURE = Path(__file__).parent / "fixtures" / "tile_14_4843_5861.mvt"
from tests.conftest import plain as _plain  # THE strip-and-join screen reader


# -- MVT decoding -------------------------------------------------------------


def test_decode_tile_reads_expected_layers() -> None:
    """The real fixture decodes into the OpenMapTiles layers the map relies on."""
    layers = {layer.name: layer for layer in decode_tile(_FIXTURE.read_bytes())}
    for expected in ("transportation", "transportation_name", "water", "waterway", "place"):
        assert expected in layers, expected
    assert layers["transportation"].extent == 4096
    assert layers["transportation"].features  # roads were decoded


def test_decode_tile_resolves_names_and_geometry() -> None:
    """Street and place features carry resolved names and non-trivial geometry."""
    layers = {layer.name: layer for layer in decode_tile(_FIXTURE.read_bytes())}
    streets = [f.name for f in layers["transportation_name"].features if f.name]
    assert any("Rue" in s or "Avenue" in s or "Av." in s for s in streets)

    places = {f.name: f.get("class") for f in layers["place"].features if f.name}
    assert "Montréal" in places and places["Montréal"] == "city"

    # A road is a line with at least two points; water is a polygon.
    assert any(
        f.geom_type == GEOM_LINE and len(f.rings[0]) >= 2
        for f in layers["transportation"].features
    )
    assert any(f.geom_type == GEOM_POLYGON for f in layers["water"].features)


def test_decode_tile_handles_empty_input() -> None:
    """An empty byte string decodes to no layers rather than raising."""
    assert decode_tile(b"") == []


def test_decode_tile_filter_keeps_the_whole_tile_visible() -> None:
    """A narrowed decode still names every layer — it only skips their features.

    The tile source decides whether a cache entry is real by whether it parsed into
    layers, so narrowing must never make a tile look like it holds nothing.
    """
    raw = _FIXTURE.read_bytes()
    full = decode_tile(raw)
    narrow = decode_tile(raw, layers={"water"})

    assert [layer.name for layer in narrow] == [layer.name for layer in full]
    assert all(layer.extent == 4096 for layer in narrow)
    picked = {layer.name: layer for layer in narrow}
    assert picked["water"].features  # the one we asked for was decoded
    assert not picked["building"].features  # the rest were skipped, not dropped


def test_decode_tile_filter_is_invisible_to_the_renderer() -> None:
    """Narrowing to ``DRAWN_LAYERS`` draws exactly the map a full decode draws.

    This is the anti-drift guard: if ``_draw_tile`` grows a lookup for a layer that
    isn't in ``DRAWN_LAYERS``, that layer arrives featureless and the rendered output
    diverges here.
    """
    from meshterm.ui.map_render import DRAWN_LAYERS, MapMarker, render_map

    raw = _FIXTURE.read_bytes()
    vp = Viewport(45.5019, -73.5674, 14, 180, 120)
    markers = [MapMarker("Yagi", 45.5019, -73.5674, is_repeater=True)]

    def drawn(layers):
        return render_map(vp, {(14, 4843, 5861): layers}, markers)

    assert drawn(decode_tile(raw, layers=DRAWN_LAYERS)) == drawn(decode_tile(raw))


def test_decode_tile_filter_skips_the_layers_the_map_never_draws() -> None:
    """The layers left undecoded are the ones that made a tile expensive."""
    from meshterm.ui.map_render import DRAWN_LAYERS

    narrow = {layer.name: layer for layer in decode_tile(_FIXTURE.read_bytes(), layers=DRAWN_LAYERS)}
    for skipped in ("housenumber", "poi", "mountain_peak"):
        assert skipped in narrow, f"{skipped} should still be named"
        assert not narrow[skipped].features, f"{skipped} should not have been decoded"


# -- buildings ----------------------------------------------------------------


def _building_dots(zoom: int) -> int:
    """Lit cells in a render of the fixture's buildings alone, at ``zoom``."""
    from meshterm.ui.map_render import render_map

    layers = decode_tile(_FIXTURE.read_bytes(), layers={"building"})
    vp = Viewport(45.4995, -73.5690, zoom, 53 * 2, 26 * 4)
    out = _plain(render_map(vp, {(14, 4843, 5861): layers}, []))
    return sum(1 for ch in out if ch not in " \n")


def test_buildings_wait_for_the_zoom_that_can_hold_them() -> None:
    """Below the gate a footprint is about two dots across, so the layer is a haze."""
    from meshterm.ui.map_render import _BUILDING_MIN_ZOOM

    assert _building_dots(_BUILDING_MIN_ZOOM) > 100
    assert _building_dots(_BUILDING_MIN_ZOOM - 1) == 0


def test_building_fill_is_stippled_so_the_streets_survive_it() -> None:
    """A braille dot is one bit: a *solid* fill would erase the street grid it covers.

    The stipple is what keeps a building a shade rather than an eraser — every cell it
    touches keeps free dots for a road to be drawn through.
    """
    from meshterm.ui.map_render import _BUILDING_MIN_ZOOM, render_map

    layers = decode_tile(_FIXTURE.read_bytes(), layers={"building"})
    vp = Viewport(45.4995, -73.5690, _BUILDING_MIN_ZOOM, 53 * 2, 26 * 4)
    out = _plain(render_map(vp, {(14, 4843, 5861): layers}, []))

    assert "⣿" not in out, "a fully lit cell means the fill left a road nowhere to go"


def test_offscreen_buildings_do_not_change_the_frame() -> None:
    """The bbox reject is an optimisation, so it must be invisible in the output.

    A downtown tile carries thousands of footprints and a zoomed-in view holds a few
    dozen; each one is rejected on its own tile-local bounds before a single point of it
    is projected. Adding a footprint the view cannot reach must render byte-identically.
    """
    from meshterm.core.mvt import Feature
    from meshterm.ui.map_render import _BUILDING_MIN_ZOOM, render_map

    vp = Viewport(45.4995, -73.5690, _BUILDING_MIN_ZOOM, 53 * 2, 26 * 4)
    cx, cy = _tile_local_of_view_centre(vp, 14, 4843, 5861)
    here = [(cx - 40, cy - 40), (cx + 40, cy - 40), (cx + 40, cy + 40),
            (cx - 40, cy + 40), (cx - 40, cy - 40)]
    far = [(10, 10), (90, 10), (90, 90), (10, 90), (10, 10)]

    def frame(rings):
        layer = Layer(name="building", extent=4096,
                      features=[Feature(geom_type=GEOM_POLYGON, rings=rings, tags={})])
        return render_map(vp, {(14, 4843, 5861): [layer]}, [])

    assert _plain(frame([here])).strip(), "the in-view footprint should draw something"
    assert frame([here]) == frame([here, far])


# -- projection / viewport ----------------------------------------------------


def test_world_projection_round_trips() -> None:
    """lon/lat -> world pixels -> lon/lat recovers the original coordinate."""
    for lat, lon, z in [(45.5, -73.6, 14), (0.0, 0.0, 3), (-33.9, 151.2, 12)]:
        wx, wy = lonlat_to_world(lat, lon, z)
        rlat, rlon = world_to_lonlat(wx, wy, z)
        assert rlat == pytest.approx(lat, abs=1e-6)
        assert rlon == pytest.approx(lon, abs=1e-6)


def test_haversine_known_distance() -> None:
    """One degree of longitude at the equator is ~111 km; identical points are 0."""
    assert haversine_km(0.0, 0.0, 0.0, 1.0) == pytest.approx(111.19, abs=0.5)
    assert haversine_km(45.0, -73.0, 45.0, -73.0) == 0.0


def test_viewport_center_projects_to_the_middle() -> None:
    """The viewport's centre lands at the middle dot; north is up."""
    vp = Viewport(45.5, -73.6, 13, 200, 120)
    cx, cy = vp.lonlat_to_dot(45.5, -73.6)
    assert cx == pytest.approx(100, abs=0.5) and cy == pytest.approx(60, abs=0.5)
    # A point due north projects above the centre (smaller y).
    _, ny = vp.lonlat_to_dot(45.6, -73.6)
    assert ny < cy


def test_viewport_fit_frames_all_points() -> None:
    """A fitted viewport is centred on the points and zoomed so they share a tile scale."""
    pts = [(45.5019, -73.5674), (45.4768, -73.5990)]
    vp = Viewport.fit(pts, 200, 120, max_zoom=14)
    assert 8 <= vp.zoom <= 14
    for lat, lon in pts:
        x, y = vp.lonlat_to_dot(lat, lon)
        assert 0 <= x < vp.dot_w and 0 <= y < vp.dot_h  # every point is on-canvas


def test_viewport_fit_fraction_ignores_outliers() -> None:
    """Framing half the nodes zooms to the dense core, letting far outliers fall off-canvas."""
    # A tight downtown cluster of five nodes (~50 m across) plus one distant outlier.
    core = [
        (45.5000, -73.5600), (45.5003, -73.5602), (45.4998, -73.5598),
        (45.5001, -73.5599), (45.4999, -73.5601),
    ]
    outlier = (46.80, -71.20)
    pts = core + [outlier]

    full = Viewport.fit(pts, 200, 120, max_zoom=16)
    half = Viewport.fit(pts, 200, 120, max_zoom=16, fraction=0.5)

    # The core-only frame is zoomed in tighter than the frame that must hold the outlier.
    assert half.zoom > full.zoom
    # Every clustered node stays on-canvas; the outlier is pushed off.
    for lat, lon in core:
        x, y = half.lonlat_to_dot(lat, lon)
        assert 0 <= x < half.dot_w and 0 <= y < half.dot_h
    ox, oy = half.lonlat_to_dot(*outlier)
    assert not (0 <= ox < half.dot_w and 0 <= oy < half.dot_h)


def test_viewport_fit_fraction_keeps_small_sets_whole() -> None:
    """With only two nodes there is no core to isolate — both are still framed."""
    pts = [(45.5019, -73.5674), (45.4768, -73.5990)]
    half = Viewport.fit(pts, 200, 120, max_zoom=14, fraction=0.5)
    full = Viewport.fit(pts, 200, 120, max_zoom=14)
    assert (half.center_lat, half.center_lon, half.zoom) == (
        full.center_lat, full.center_lon, full.zoom
    )


def test_viewport_zoom_and_pan() -> None:
    """Zooming and panning return new viewports; zoom clamps to its bounds."""
    vp = Viewport(45.5, -73.6, 10, 200, 120)
    assert vp.zoomed(2).zoom == 12
    assert vp.zoomed(50, max_zoom=16).zoom == 16  # clamped
    assert vp.zoomed(-50, min_zoom=3).zoom == 3
    east = vp.panned(0.5, 0)
    assert east.center_lon > vp.center_lon  # panning east increases longitude
    north = vp.panned(0, -0.5)
    assert north.center_lat > vp.center_lat  # panning north increases latitude


def test_viewport_tiles_cover_the_view() -> None:
    """The viewport reports the handful of tiles overlapping it at the tile zoom."""
    vp = Viewport(45.5019, -73.5674, 14, 200, 120)
    tiles = vp.tiles(14)
    assert tiles and all(z == 14 for z, _, _ in tiles)
    # The fixture tile for this centre must be among them.
    assert (14, 4843, 5861) in tiles


# -- braille canvas -----------------------------------------------------------


def test_canvas_plots_dots_as_braille() -> None:
    """A single plotted dot renders as a braille glyph in the top-left cell."""
    canvas = MapCanvas(4, 2)
    canvas.plot(0, 0, (255, 0, 0), 1)
    out = _plain(canvas.to_ansi_lines())
    assert out.splitlines()[0][0] == "⠁"  # braille dot-1


def test_canvas_priority_decides_cell_colour() -> None:
    """When dots from two features share a cell, the higher priority sets its colour."""
    canvas = MapCanvas(1, 1)
    canvas.plot(0, 0, (10, 20, 30), 1)  # low priority
    canvas.plot(1, 0, (200, 100, 50), 9)  # high priority, same cell
    ansi = "".join(canvas.to_ansi_lines())
    assert "38;2;200;100;50" in ansi  # the high-priority colour won
    assert "38;2;10;20;30" not in ansi


def test_canvas_marker_and_label_do_not_overprint() -> None:
    """A marker keeps its glyph and places its label in a neighbouring cell."""
    canvas = MapCanvas(20, 3)
    canvas.marker(4, 4, "★", (255, 255, 255))
    assert canvas.marker_label(4, 4, "me", (255, 255, 255))
    out = _plain(canvas.to_ansi_lines())
    assert "★" in out and "me" in out
    row = out.splitlines()[1]
    assert "★me" not in row  # a gap sits between the marker and its label


def test_canvas_label_collision_is_avoided() -> None:
    """A checked label is skipped when it would overlap an already-placed one."""
    canvas = MapCanvas(20, 1)
    assert canvas.place_label(10, 0, "First", (200, 200, 200))
    assert not canvas.place_label(10, 0, "Second", (200, 200, 200))  # overlaps → skipped


def test_canvas_labels_keep_a_vertical_gap() -> None:
    """A checked label is skipped when it would sit flush above/below existing text."""
    canvas = MapCanvas(20, 3)
    assert canvas.place_label(20, 4, "Row1", (200, 200, 200))  # dot y=4 → cell row 1
    # Directly below (cell row 2) with overlapping columns: rejected for lack of a gap.
    assert not canvas.place_label(20, 8, "Row2", (200, 200, 200))
    # Same row but clear of the horizontal span still fits.
    assert canvas.place_label(2, 4, "Far", (200, 200, 200))


def test_parse_hex() -> None:
    """Hex colours parse to RGB triples, with or without the leading hash."""
    assert parse_hex("#38bdf8") == (0x38, 0xBD, 0xF8)
    assert parse_hex("ffffff") == (255, 255, 255)


# -- compositor over a real tile ----------------------------------------------


def test_render_map_draws_basemap_streets_and_labels() -> None:
    """Rendering the real fixture yields braille geometry and a place label."""
    from meshterm.ui.map_render import MapMarker, render_map

    vp = Viewport(45.5019, -73.5674, 14, 180, 120)
    layers = decode_tile(_FIXTURE.read_bytes())
    tiles = {(14, 4843, 5861): layers}
    markers = [MapMarker("Yagi", 45.5019, -73.5674, is_repeater=True)]
    out = _plain(render_map(vp, tiles, markers))
    assert any(0x2800 <= ord(ch) <= 0x28FF for ch in out)  # braille was drawn
    assert "▲" in out and "Yagi" in out  # the repeater marker + label
    assert "Montréal" in out  # a place label from the tile


def test_render_map_prioritises_repeater_glyph() -> None:
    """A repeater and a node at the same spot resolve to the repeater's marker on top."""
    from meshterm.ui.map_render import MapMarker, render_map

    vp = Viewport(45.50, -73.57, 14, 60, 40)
    markers = [
        MapMarker("node", 45.50, -73.57),
        MapMarker("rptr", 45.50, -73.57, is_repeater=True),
    ]
    out = _plain(render_map(vp, {}, markers))
    assert "▲" in out and "●" not in out


def _street_labels_placed(cols: int, rows: int, zoom: int) -> int:
    """How many street names actually reach the canvas at this size and zoom."""
    from meshterm.ui.map_render import DRAWN_LAYERS, _draw_tile, _Frame
    from meshterm.ui.mapcanvas import MapCanvas

    layers = decode_tile(_FIXTURE.read_bytes(), layers=DRAWN_LAYERS)
    vp = Viewport(45.5019, -73.5674, zoom, cols * 2, (rows - 4) * 4)
    canvas = MapCanvas(vp.dot_w // 2, vp.dot_h // 4)
    frame = _Frame(canvas=canvas, viewport=vp)
    _draw_tile(frame, layers, 14, 4843, 5861)

    placed = 0
    for label in sorted(frame.labels, key=lambda l: l.rank):
        if vp.zoom < label.min_zoom:
            continue
        for ax, ay in ((label.x, label.y), *label.alts):
            if canvas.place_label(ax, ay, label.text, label.color, bold=label.bold):
                placed += label.min_zoom == 15  # the street-label gate identifies them
                break
    return placed


def test_street_labels_get_denser_as_you_zoom_in() -> None:
    """Zooming toward a street must not make its name less likely to appear.

    Anchoring a label to the feature's own midpoint pinned it to a fixed geographic
    point, so the tighter the view the less often that point was still on screen — the
    fixture's 265 named streets yielded 2 labels at zoom 16 and 10 at zoom 15.
    """
    assert _street_labels_placed(53, 26, 16) >= 5
    assert _street_labels_placed(53, 26, 15) >= 10
    # A wider terminal sees more of the same ground, so it may name more -- never fewer.
    assert _street_labels_placed(72, 24, 16) >= _street_labels_placed(53, 26, 16)


def _tile_local_of_view_centre(vp: Viewport, tz: int, tx: int, ty: int, extent: int = 4096):
    """The tile-local point that lands in the middle of this viewport (inverts feature_to_dot)."""
    from meshterm.core.geo import TILE_PX

    ox, oy = vp.origin_world
    scale = 2.0 ** (vp.zoom - tz)
    lx = extent * ((vp.dot_w / 2 + ox) / (TILE_PX * scale) - tx)
    ly = extent * ((vp.dot_h / 2 + oy) / (TILE_PX * scale) - ty)
    return lx, ly


def test_street_name_is_drawn_only_once() -> None:
    """OSM splits a long street into several features; the map names it once."""
    from meshterm.ui.map_render import DRAWN_LAYERS, MapMarker, render_map

    layers = decode_tile(_FIXTURE.read_bytes(), layers=DRAWN_LAYERS)
    vp = Viewport(45.5019, -73.5674, 16, 53 * 2, 22 * 4)
    out = _plain(render_map(vp, {(14, 4843, 5861): layers},
                            [MapMarker("YUL", 45.5040, -73.5700, is_repeater=True)]))

    # René-Lévesque arrives as several segments and used to be drawn twice on one screen.
    assert out.count("René-Lévesque") <= 1, "a street was named more than once"


def test_line_label_anchors_on_the_visible_stretch() -> None:
    """A street crossing the view is named even with both its endpoints off screen."""
    from meshterm.ui.map_render import _Frame, _add_line_label
    from meshterm.ui.mapcanvas import MapCanvas

    vp = Viewport(45.5019, -73.5674, 14, 120, 80)
    frame = _Frame(canvas=MapCanvas(60, 20), viewport=vp)
    _, cy = _tile_local_of_view_centre(vp, 14, 4843, 5861)
    # A line spanning the whole tile at the view's latitude: its own midpoint is far away,
    # but it crosses the canvas, so the clip must find it.
    _add_line_label(frame, [[(0, cy), (4096, cy)]], 4096, 14, 4843, 5861, "Rue Long",
                    ("#9aa0aa", False, 7))

    assert len(frame.labels) == 1
    label = frame.labels[0]
    assert 0 <= label.x <= vp.dot_w and 0 <= label.y <= vp.dot_h


def test_line_label_off_screen_is_not_queued() -> None:
    """A feature with nothing on screen costs no label slot at all."""
    from meshterm.ui.map_render import _Frame, _add_line_label
    from meshterm.ui.mapcanvas import MapCanvas

    vp = Viewport(45.5019, -73.5674, 16, 120, 80)
    frame = _Frame(canvas=MapCanvas(60, 20), viewport=vp)
    # A short line in the far corner of the tile, well outside a zoom-16 window.
    _add_line_label(frame, [[(0, 0), (8, 8)]], 4096, 14, 4843, 5861, "Nowhere",
                    ("#9aa0aa", False, 7))

    assert frame.labels == []


def test_line_label_offers_alternates_along_the_visible_run() -> None:
    """A crowded first choice falls back further along the street rather than vanishing."""
    from meshterm.ui.map_render import _Frame, _add_line_label
    from meshterm.ui.mapcanvas import MapCanvas

    vp = Viewport(45.5019, -73.5674, 14, 120, 80)
    frame = _Frame(canvas=MapCanvas(60, 20), viewport=vp)
    cx, cy = _tile_local_of_view_centre(vp, 14, 4843, 5861)
    # A zig-zag across the view gives several visible pieces to choose between.
    ring = [(cx - 120 + i * 40, cy - 40 + (i % 2) * 80) for i in range(8)]
    _add_line_label(frame, [ring], 4096, 14, 4843, 5861, "Rue Zig", ("#9aa0aa", False, 7))

    assert frame.labels and frame.labels[0].alts, "no fallback anchors offered"
    assert all(a != (frame.labels[0].x, frame.labels[0].y) for a in frame.labels[0].alts)


def test_render_map_drops_crowded_labels_favouring_repeaters() -> None:
    """When labels can't all fit, the repeater's wins and a crowded node's is dropped."""
    from meshterm.ui.map_render import MapMarker, render_map

    # Three nodes stacked on one spot: only the two sides (left/right) can hold a label,
    # so one of the three must show as a bare marker — and the repeater must not be it.
    vp = Viewport(45.50, -73.57, 14, 40, 8)
    markers = [
        MapMarker("NODEONE", 45.50, -73.57),
        MapMarker("NODETWO", 45.50, -73.57),
        MapMarker("REPEATER", 45.50, -73.57, is_repeater=True),
    ]
    out = _plain(render_map(vp, {}, markers))
    assert "▲" in out  # the repeater's glyph is on top
    assert "REPEATER" in out  # and it keeps its label (placed first)
    # Only one of the two leaf nodes could fit a label; the other is a bare marker.
    assert ("NODEONE" in out) != ("NODETWO" in out)


def _glyph_color(lines: list[str], glyph: str) -> tuple[int, int, int]:
    """Extract the truecolour ``(r, g, b)`` the given glyph was rendered with."""
    m = re.search(
        r"38;2;(\d+);(\d+);(\d+)m(?:\x1b\[1m)?" + re.escape(glyph), "".join(lines)
    )
    assert m, f"glyph {glyph!r} not found with a colour"
    return int(m.group(1)), int(m.group(2)), int(m.group(3))


def test_render_map_brightens_piled_markers() -> None:
    """A cell many nodes share renders its glyph brighter than a lone node's."""
    from meshterm.ui.map_render import _NODE, MapMarker, render_map

    base = parse_hex(_NODE[1])
    vp = Viewport(45.50, -73.57, 14, 60, 40)

    lone = render_map(vp, {}, [MapMarker("solo", 45.50, -73.57)])
    assert _glyph_color(lone, "●") == base  # a single node keeps its base colour

    crowd = [MapMarker(f"n{i}", 45.50, -73.57) for i in range(8)]
    piled = _glyph_color(render_map(vp, {}, crowd), "●")
    # Washed toward white: every channel is brighter than the base cyan.
    assert all(p > b for p, b in zip(piled, base))
    assert piled != base


def test_render_map_works_without_basemap() -> None:
    """With no tiles the nodes still render on a blank grid (the offline fallback)."""
    from meshterm.ui.map_render import MapMarker, render_map

    vp = Viewport.fit([(45.5, -73.6), (45.4, -73.5)], 120, 80, max_zoom=14)
    markers = [
        MapMarker("A", 45.5, -73.6, is_self=True),
        MapMarker("B", 45.4, -73.5, is_repeater=True),
    ]
    out = _plain(render_map(vp, {}, markers))
    assert "★" in out and "▲" in out


# -- basemap source (offline behaviour) ---------------------------------------


def test_basemap_source_offline_is_graceful(tmp_path: Path) -> None:
    """An unreachable source reports unavailable and returns no tiles, never raising."""
    from meshterm.services.basemap import BasemapSource

    src = BasemapSource(tmp_path / "cache", tilejson_url="http://127.0.0.1:1/none", timeout=0.2)
    assert src.available is False
    assert src.max_zoom == 14  # sensible default when the TileJSON can't be fetched
    assert src.load_tile(14, 4843, 5861) is None


def test_basemap_source_reads_cached_tile(tmp_path: Path) -> None:
    """A tile already on disk is decoded without any network access."""
    from meshterm.services.basemap import BasemapSource

    cache = tmp_path / "cache"
    dest = cache / "tiles" / "14" / "4843"
    dest.mkdir(parents=True)
    (dest / "5861.pbf").write_bytes(_FIXTURE.read_bytes())
    src = BasemapSource(cache, tilejson_url="http://127.0.0.1:1/none", timeout=0.2)
    layers = src.load_tile(14, 4843, 5861)
    assert layers is not None
    assert any(layer.name == "transportation" for layer in layers)


def _offline_source(cache: Path):
    """A source that can't reach anything — every fetch is silence, not an empty tile."""
    from meshterm.services.basemap import BasemapSource

    return BasemapSource(cache, tilejson_url="http://127.0.0.1:1/none", timeout=0.2)


def test_basemap_source_never_caches_an_unanswered_fetch(tmp_path: Path) -> None:
    """A timeout writes nothing: a blank square now must not become a blank square for ever."""
    from meshterm.services import basemap as basemap_mod

    cache = tmp_path / "cache"
    assert _offline_source(cache).load_tile(14, 4843, 5861) is None
    assert list(cache.rglob("*.pbf")) == []

    # The same, with the source resolved and the *fetch* the thing that fails — the flaky
    # link the PicoCalc lives on. The tile stays unknown, so the next pan asks again.
    src = _offline_source(cache)
    src._template = "http://tiles.invalid/{z}/{x}/{y}.pbf"
    src._resolved = True
    calls: list[str] = []

    def _get(url: str):
        calls.append(url)
        return basemap_mod._Response(False, b"")

    src._http_get = _get  # type: ignore[method-assign]
    assert src.load_tile(14, 4843, 5861) is None
    assert src.load_tile(14, 4843, 5861) is None
    assert len(calls) == 2  # retried, not written off as empty
    assert list(cache.rglob("*.pbf")) == []


def test_basemap_source_prunes_a_blank_cached_tile(tmp_path: Path) -> None:
    """A zero-byte entry (an older build's failure marker) is dropped rather than drawn."""
    cache = tmp_path / "cache"
    tile = cache / "tiles" / "14" / "4843" / "5861.pbf"
    tile.parent.mkdir(parents=True)
    tile.write_bytes(b"")
    assert _offline_source(cache).load_tile(14, 4843, 5861) is None
    assert not tile.exists()  # pruned, so a session with network re-fetches it


def test_basemap_source_prunes_a_corrupt_cached_tile(tmp_path: Path) -> None:
    """Bytes cut short mid-write don't decode, so they're pruned instead of kept blank."""
    cache = tmp_path / "cache"
    tile = cache / "tiles" / "14" / "4843" / "5861.pbf"
    tile.parent.mkdir(parents=True)
    tile.write_bytes(_FIXTURE.read_bytes()[:200])
    assert _offline_source(cache).load_tile(14, 4843, 5861) is None
    assert not tile.exists()


def test_basemap_source_caches_only_tiles_with_content(tmp_path: Path) -> None:
    """The disk cache holds decodable geometry — never an empty or unparseable answer."""
    from meshterm.services import basemap as basemap_mod

    cache = tmp_path / "cache"
    src = _offline_source(cache)
    src._template = "http://tiles.invalid/{z}/{x}/{y}.pbf"  # skip TileJSON resolution
    src._resolved = True

    bodies = iter([b"", b"not a vector tile at all", _FIXTURE.read_bytes()])
    src._http_get = lambda url: basemap_mod._Response(True, next(bodies))  # type: ignore[method-assign]

    assert src.load_tile(14, 1, 1) is None  # answered "empty"
    assert src.load_tile(14, 2, 2) is None  # answered with junk
    assert list(cache.rglob("*.pbf")) == []
    layers = src.load_tile(14, 4843, 5861)  # answered with a real tile
    assert layers is not None
    assert (cache / "tiles" / "14" / "4843" / "5861.pbf").exists()


def test_basemap_source_keeps_a_tile_whose_layers_are_all_undrawn(tmp_path: Path) -> None:
    """Narrowing the decode must not make a good cached tile look blank and get pruned.

    A source told to decode a layer the tile doesn't carry sees no features at all. If
    that were read as "nothing here", the entry would be deleted and re-downloaded on
    every session — the cache paying for a rendering decision.
    """
    from meshterm.services.basemap import BasemapSource

    cache = tmp_path / "cache"
    tile = cache / "tiles" / "14" / "4843" / "5861.pbf"
    tile.parent.mkdir(parents=True)
    tile.write_bytes(_FIXTURE.read_bytes())

    src = BasemapSource(
        cache,
        tilejson_url="http://127.0.0.1:1/none",
        timeout=0.2,
        layers=frozenset({"a_layer_this_tile_does_not_have"}),
    )
    layers = src.load_tile(14, 4843, 5861)

    assert layers, "a real tile must still read as real"
    assert not any(layer.features for layer in layers)  # nothing was decoded
    assert tile.exists(), "the cache entry must survive"


def test_decoded_layers_survive_a_round_trip() -> None:
    """The sidecar encoding restores exactly what the decoder produced."""
    from meshterm.core.mvt import dumps_layers, loads_layers
    from meshterm.ui.map_render import DRAWN_LAYERS

    original = decode_tile(_FIXTURE.read_bytes(), layers=DRAWN_LAYERS)
    restored = loads_layers(dumps_layers(original, stamp="x"), stamp="x")

    assert restored is not None
    assert [(l.name, l.extent) for l in restored] == [(l.name, l.extent) for l in original]
    for before, after in zip(original, restored):
        assert after.features == before.features


def test_decoded_layers_refuse_a_blob_from_another_layer_set() -> None:
    """A narrowed blob must never be served to a caller that wants more of the tile."""
    from meshterm.core.mvt import dumps_layers, loads_layers

    blob = dumps_layers(decode_tile(_FIXTURE.read_bytes(), layers={"water"}), stamp="water")
    assert loads_layers(blob, stamp="water") is not None
    assert loads_layers(blob, stamp="water,place") is None


def test_decoded_layers_treat_damage_as_a_miss() -> None:
    """A truncated or foreign sidecar is a cache miss, never an exception."""
    from meshterm.core.mvt import dumps_layers, loads_layers

    blob = dumps_layers(decode_tile(_FIXTURE.read_bytes(), layers={"water"}), stamp="s")
    assert loads_layers(blob[: len(blob) // 2], stamp="s") is None
    assert loads_layers(b"", stamp="s") is None
    assert loads_layers(b"not marshal at all", stamp="s") is None


def test_basemap_source_writes_and_reuses_a_decoded_sidecar(tmp_path: Path) -> None:
    """The second load parses nothing: it comes back from the sidecar."""
    cache = tmp_path / "cache"
    tile = cache / "tiles" / "14" / "4843" / "5861.pbf"
    tile.parent.mkdir(parents=True)
    tile.write_bytes(_FIXTURE.read_bytes())

    src = _offline_source(cache)
    first = src.load_tile(14, 4843, 5861)
    sidecar = cache / "decoded" / "14" / "4843" / "5861.bin"
    assert first is not None
    assert sidecar.exists(), "decoding should have been written down"

    # Break the raw tile: a second load that still works can only have used the sidecar.
    tile.write_bytes(b"junk that cannot decode")
    second = src.load_tile(14, 4843, 5861)
    assert second is not None
    assert [(l.name, len(l.features)) for l in second] == [
        (l.name, len(l.features)) for l in first
    ]


def test_basemap_source_ignores_a_sidecar_from_another_layer_set(tmp_path: Path) -> None:
    """Widening what the map draws re-decodes rather than serving the narrower blob."""
    from meshterm.services.basemap import BasemapSource

    cache = tmp_path / "cache"
    tile = cache / "tiles" / "14" / "4843" / "5861.pbf"
    tile.parent.mkdir(parents=True)
    tile.write_bytes(_FIXTURE.read_bytes())

    def source(layers):
        return BasemapSource(
            cache, tilejson_url="http://127.0.0.1:1/none", timeout=0.2, layers=layers
        )

    narrow = source(frozenset({"water"}))
    assert narrow.load_tile(14, 4843, 5861) is not None

    wider = source(frozenset({"water", "place"}))
    layers = {layer.name: layer for layer in wider.load_tile(14, 4843, 5861) or []}
    assert layers["place"].features, "the wider set must have been decoded afresh"


def test_basemap_source_prunes_the_decoded_cache_to_its_budget(tmp_path: Path) -> None:
    """The sidecar half of the cache is bounded; the raw tiles it derives from are not."""
    from meshterm.services.basemap import BasemapSource

    cache = tmp_path / "cache"
    decoded = cache / "decoded" / "14" / "1"
    decoded.mkdir(parents=True)
    for i in range(6):
        blob = decoded / f"{i}.bin"
        blob.write_bytes(b"x" * 1000)
        os.utime(blob, (i, i))  # oldest first

    # 6 KB present, 3 KB allowed: the three oldest go, the three newest stay.
    src = BasemapSource(cache, tilejson_url="http://127.0.0.1:1/none", max_decoded_bytes=3000)
    src._prune_decoded()

    left = sorted(p.stem for p in decoded.glob("*.bin"))
    assert left == ["3", "4", "5"], "the oldest sidecars go first"


def test_basemap_source_remembers_a_blank_tile_for_the_session(tmp_path: Path) -> None:
    """An answered-empty tile isn't re-requested this session (but isn't written down)."""
    from meshterm.services import basemap as basemap_mod

    src = _offline_source(tmp_path / "cache")
    src._template = "http://tiles.invalid/{z}/{x}/{y}.pbf"
    src._resolved = True
    calls: list[str] = []

    def _get(url: str):
        calls.append(url)
        return basemap_mod._Response(True, b"")

    src._http_get = _get  # type: ignore[method-assign]
    assert src.load_tile(14, 1, 1) is None
    assert src.load_tile(14, 1, 1) is None
    assert len(calls) == 1


def test_basemap_http_get_separates_an_answer_from_silence(tmp_path: Path) -> None:
    """404 is an answer; a 500, and a body short of Content-Length, are not."""
    import urllib.error

    from meshterm.services.basemap import BasemapSource

    src = BasemapSource(tmp_path / "cache")

    class _Resp:
        """The slice of an ``http.client.HTTPResponse`` the fetcher touches."""

        def __init__(self, body: bytes, declared: str | None) -> None:
            self._body, self.headers = body, {"Content-Length": declared}

        def read(self) -> bytes:
            return self._body

        def __enter__(self):
            return self

        def __exit__(self, *_exc) -> bool:
            return False

    def _fake(result):
        def _urlopen(_req, timeout=None):  # noqa: ANN001
            if isinstance(result, Exception):
                raise result
            return result

        return _urlopen

    def _get(result) -> tuple[bool, bytes]:
        import urllib.request

        saved = urllib.request.urlopen
        urllib.request.urlopen = _fake(result)  # type: ignore[assignment]
        try:
            return tuple(src._http_get("http://tiles.invalid/t"))
        finally:
            urllib.request.urlopen = saved  # type: ignore[assignment]

    err = lambda code: urllib.error.HTTPError("u", code, "", {}, None)  # noqa: E731
    assert _get(_Resp(b"tile-bytes", "10")) == (True, b"tile-bytes")
    assert _get(_Resp(b"tile-b", "10")) == (False, b"")  # truncated read
    assert _get(_Resp(b"anything", None)) == (True, b"anything")  # no declared length
    assert _get(err(404)) == (True, b"")  # "no tile here" — an answer
    assert _get(err(500)) == (False, b"")  # server fault — no answer
    assert _get(err(429)) == (False, b"")  # throttled — no answer
    assert _get(TimeoutError("timed out")) == (False, b"")


# -- the tool -----------------------------------------------------------------


@pytest.fixture()
def ctx(tmp_path: Path):
    """A mock-backed application context with the plain (console) UI surface."""
    from meshterm.context import AppContext
    from meshterm.core.admin_store import AdminStore
    from meshterm.core.config import Settings
    from meshterm.core.device_store import DeviceStore
    from meshterm.persistence.repository import Repository
    from meshterm.ui.theme import MESH_THEME

    settings = Settings(config_dir=tmp_path, db_path=tmp_path / "map.db")
    context = AppContext(
        console=Console(file=io.StringIO(), theme=MESH_THEME),
        settings=settings,
        repo=Repository(settings.db_path),
        device_store=DeviceStore(tmp_path / "devices.json"),
        admin_store=AdminStore(tmp_path / "admin.json"),
        mock=True,
    )
    yield context
    context.repo.close()


async def test_map_tool_static_render_plots_contacts(ctx) -> None:
    """The CLI path plots the device's located contacts and reports the breakdown.

    The mock companion's contacts carry two located repeaters and one located leaf node
    (a fourth, Alice, has no fix), so the contact list — not the observation history — is
    what fills the map.
    """
    # Seed an observation whose key matches a located contact, so its reception detail is
    # merged onto that contact's marker.
    run_id = ctx.repo.start_run("monitor", {})
    ctx.repo.record_observation(
        run_id,
        Observation(node="a1b2c3d4", name="Yagi-Repeater", node_type=NODE_TYPE_REPEATER,
                    snr=6.0, observed_at=utcnow()),
    )
    result = await MapTool().run(ctx, {"static": True, "basemap": False})
    assert result.summary["located"] == 3
    assert result.summary["repeaters"] == 2
    assert result.summary["nodes"] == 1
    assert result.summary["self_located"] is False
    out = ctx.console.file.getvalue()
    assert out != ""
    assert "1 pkts" in out  # the seeded observation's detail merged onto the contact


def test_usable_fix_rejects_out_of_range_and_null_island() -> None:
    """A fix is usable only in valid lat/lon range and away from the 0/0 no-GPS sentinel."""
    from meshterm.core.geo import usable_fix

    assert usable_fix(45.5, -73.6) is True
    assert usable_fix(90.0, 180.0) is True and usable_fix(-90.0, -180.0) is True  # extremes
    assert usable_fix(0.0, 0.0) is False  # null island (a no-GPS companion reports this)
    assert usable_fix(-97.0, -1041.97) is False  # out of range (a real advert seen in the wild)
    assert usable_fix(45.0, 181.0) is False and usable_fix(-91.0, -73.0) is False


async def test_gather_markers_drops_out_of_range_fix(ctx) -> None:
    """A node advertising nonsense coordinates is never plotted, only the real one is.

    Some firmware reports an out-of-range fix (a companion has advertised ``lat -97,
    lon -1042``); projecting it flings the view off the world, leaving the map an all-black
    off-world frame. It is treated as no fix at all, the same guard the 0/0 null island gets.
    """
    from meshterm.tools.map import gather_markers

    run_id = ctx.repo.start_run("monitor", {})
    ctx.repo.record_observation(run_id, Observation(
        node="beefbeefbeef", name="BadFix", node_type=NODE_TYPE_REPEATER,
        lat=-97.0, lon=-1041.97, observed_at=utcnow()))
    ctx.repo.record_observation(run_id, Observation(
        node="cafecafecafe", name="GoodFix", node_type=NODE_TYPE_REPEATER,
        lat=45.5, lon=-73.6, observed_at=utcnow()))
    labels = {m.label for m in await gather_markers(ctx)}
    assert "GoodFix" in labels
    assert "BadFix" not in labels


def test_repository_round_trips_map_view(ctx) -> None:
    """The saved map viewport persists and reads back; absent by default."""
    assert ctx.repo.get_map_view() is None
    ctx.repo.set_map_view(45.51, -73.57, 13)
    lat, lon, zoom = ctx.repo.get_map_view()
    assert (lat, lon) == pytest.approx((45.51, -73.57))
    assert zoom == 13
    # A later save overwrites the single stored view.
    ctx.repo.set_map_view(40.0, -74.0, 9)
    assert ctx.repo.get_map_view() == pytest.approx((40.0, -74.0, 9))


async def test_map_tool_reports_nothing_to_plot(ctx, monkeypatch) -> None:
    """With no located contacts and no located history the tool returns cleanly."""
    async def _no_contacts(_ctx):
        return []

    monkeypatch.setattr("meshterm.tools.map._contacts", _no_contacts)
    result = await MapTool().run(ctx, {"static": True, "basemap": False})
    assert result.summary == {"located": 0}


async def test_gather_markers_drops_null_island_fixes(ctx, monkeypatch) -> None:
    """A node advertising a 0/0 fix (no GPS lock) is not plotted at null island.

    Framing such a marker (filter to it, press Enter) would drop the map onto the empty
    mid-Atlantic — a screen of solid water fill — so a both-near-zero fix is treated as no
    fix at all, exactly as our own node's marker already is.
    """
    from meshterm.core.models import Contact
    from meshterm.tools.map import gather_markers

    async def _contacts(_ctx):
        return [
            Contact(name="Real", public_key="aa" * 32, lat=45.50, lon=-73.57),
            Contact(name="NoFix", public_key="bb" * 32, lat=0.0, lon=0.0),
        ]

    monkeypatch.setattr("meshterm.tools.map._contacts", _contacts)
    labels = [m.label for m in await gather_markers(ctx)]
    assert "Real" in labels
    assert "NoFix" not in labels  # the null-island node is dropped


class _StubSession:
    """Minimal stand-in for :class:`TuiSession` for driving :class:`MapScreen`."""

    def __init__(self, cols: int, rows: int) -> None:
        self._cols, self._rows = cols, rows
        self.invalidated = 0

    def base_body_size(self) -> tuple[int, int]:
        return self._cols, self._rows

    def invalidate(self) -> None:
        self.invalidated += 1


class _StubSource:
    """An always-offline tile source, so the screen renders nodes only (no network)."""

    available = False
    max_zoom = 14

    def load_tile(self, z: int, x: int, y: int):
        return None


def _loaded_tile() -> list[Layer]:
    """A stand-in for a decoded tile: truthy, which is all the budget cares about."""
    return [Layer(name="water", extent=4096)]


def _map_screen_with_tiles(count: int) -> "MapScreen":
    """A rendered map screen carrying ``count`` tiles' worth of pan history."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    screen = MapScreen(_StubSession(80, 24), [MapMarker("A", 45.5, -73.6)], _StubSource(), 14)
    screen.render_body(80)
    for i in range(count):
        screen._tiles[(14, 9000 + i, 9000 + i)] = _loaded_tile()
    return screen


def _budget(screen) -> int:  # noqa: ANN001 - the screen's own arithmetic, mirrored
    from meshterm.ui.map_screen import _MIN_TILE_CACHE, _TILE_CACHE_SCREENS

    in_view = len(screen._viewport.tiles(14))
    return max(_MIN_TILE_CACHE, in_view * _TILE_CACHE_SCREENS)


def test_map_tile_cache_stays_bounded_while_panning() -> None:
    """Panning far doesn't accumulate decoded tiles without limit.

    One decoded tile is ~0.9 MB on the PicoCalc, which has ~100 MB in total, so an
    unbounded cache turns a long pan into an out-of-memory kill.
    """
    screen = _map_screen_with_tiles(200)
    for _ in range(12):
        screen.handle("right")
        screen.render_body(80)

    held = sum(1 for layers in screen._tiles.values() if layers)
    assert held <= _budget(screen), f"{held} decoded tiles held, over budget"


def test_map_tile_cache_never_drops_what_is_on_screen() -> None:
    """Whatever the view needs survives the trim — eviction starts at the far end."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    screen = MapScreen(_StubSession(80, 24), [MapMarker("A", 45.5, -73.6)], _StubSource(), 14)
    screen.render_body(80)
    visible = list(screen._viewport.tiles(14))
    for t in visible:
        screen._tiles[t] = _loaded_tile()
    for i in range(200):  # a long pan's worth of history arriving after them
        screen._tiles[(14, 9000 + i, 9000 + i)] = _loaded_tile()

    screen.render_body(80)

    for t in visible:
        assert screen._tiles.get(t), f"{t} is on screen and must not have been evicted"


def test_map_tile_cache_keeps_the_absent_tile_markers() -> None:
    """A ``None`` is the memory of having asked; it costs a slot, so it is never evicted.

    Dropping one would buy nothing back and cost a re-request on the very next repaint.
    """
    screen = _map_screen_with_tiles(200)
    for i in range(30):
        screen._tiles[(14, 100 + i, 100)] = None

    screen.render_body(80)

    absent = [k for k, v in screen._tiles.items() if v is None]
    assert len(absent) == 30, "absent-tile markers were evicted along with the geometry"


class _CapturingSession(_StubSession):
    """Drives :func:`open_map` headless: captures the pushed screen, renders it once, then
    replays a canned key sequence — so a test can assert on where the map opened and what
    it did (or didn't) persist as the view moves."""

    def __init__(self, cols: int, rows: int, keys: tuple[str, ...] = ()) -> None:
        super().__init__(cols, rows)
        self.keys = keys
        self.screen = None
        self.repainted = False

    async def run_screen(self, screen):  # noqa: ANN001, ANN201
        self.screen = screen
        screen.render_body(self._cols)
        for key in self.keys:
            screen.handle(key)
        return None

    def request_full_repaint(self) -> None:
        self.repainted = True


def test_map_screen_renders_pans_zooms_and_resets() -> None:
    """The interactive screen fills its body, and wasd/zoom/reset move the viewport."""
    from meshterm.core.geo import Viewport
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    session = _StubSession(80, 24)
    markers = [
        MapMarker("A", 45.50, -73.60, is_repeater=True),
        MapMarker("B", 45.40, -73.50),
    ]
    screen = MapScreen(session, markers, _StubSource(), 14)

    lines = screen.render_body(80)
    assert len(lines) == 24  # fills the body height reported by the session
    start = screen._viewport

    screen.handle("right")  # pan east → longitude increases
    assert screen._viewport.center_lon > start.center_lon
    screen.handle("up")  # pan north → latitude increases
    assert screen._viewport.center_lat > start.center_lat

    z = screen._viewport.zoom
    screen.handle("pageup")
    assert screen._viewport.zoom == z + 1
    screen.handle("pagedown")
    assert screen._viewport.zoom == z

    screen.handle("home")  # reset refits to the nodes
    refit = Viewport.fit([(m.lat, m.lon) for m in markers], start.dot_w, start.dot_h, max_zoom=14)
    assert screen._viewport.zoom == refit.zoom
    assert screen._viewport.center_lat == pytest.approx(refit.center_lat)

    # Letters never pan or zoom — they feed the find filter instead.
    view = screen._viewport
    screen.handle("text", "d")
    assert screen._viewport is view and screen._filter == "d"
    screen.handle("backspace")

    # Offline source: nodes still render and both markers are present.
    assert "▲" in _plain(screen.render_body(80)) and "●" in _plain(screen.render_body(80))
    # The basemap's state is a status atom, so it rides the title's `·` chain (standing in
    # for the scale) and leaves the footer a pure key line inside its 72-cell budget.
    assert screen.title.endswith("· offline")
    assert "offline" not in screen.footer_hint
    assert cell_len(screen.footer_hint) <= 72


def test_map_screen_shift_pans_by_a_single_cell() -> None:
    """Holding Shift with an arrow pans finely, by one character cell."""
    from meshterm.core.geo import lonlat_to_world, world_to_lonlat
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [MapMarker("A", 45.50, -73.60), MapMarker("B", 45.40, -73.50)]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14)
    screen.render_body(80)
    start = screen._viewport

    # A coarse east pan (30% of the view) moves much further than a fine one.
    screen.handle("right")
    coarse = screen._viewport.center_lon - start.center_lon

    screen._viewport = start
    screen.handle("shift_right")
    fine = screen._viewport.center_lon - start.center_lon
    assert 0 < fine < coarse

    # The fine step is exactly one cell (2 dots) east at the current zoom.
    cx, cy = lonlat_to_world(start.center_lat, start.center_lon, start.zoom)
    _, expected_lon = world_to_lonlat(cx + 2, cy, start.zoom)
    assert screen._viewport.center_lon == pytest.approx(expected_lon)


def test_map_fkey_lane_names_its_three_destinations_and_the_zoom() -> None:
    """The map repurposes the nav keys, so its lane labels them — and offers no dead key."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen
    from meshterm.ui.tui.fkeys import action_for

    screen = MapScreen(_StubSession(80, 24), [MapMarker("A", 45.5, -73.6)], _StubSource(), 14)
    lane = screen.fkey_lane

    # PgUp/PgDn zoom here and Home reframes — the shared paging labels would all be lies,
    # and "end" is bound to nothing at all, so no jump rides the Shift bank.
    # The zoom pair rises to the right, like every directional pair on the lane.
    assert [pair.label if pair else None for pair in lane] == [
        "Region", "You", "Frame", "Zoom -", "Zoom +",
    ]
    assert all(action_for(lane, n) is None for n in range(6, 11))
    assert action_for(lane, 1) == "home" and action_for(lane, 5) == "pageup"
    assert action_for(lane, 2) == "locate" and action_for(lane, 3) == "frame"
    # Region and the zoom always act; the other two only where they'd land somewhere.
    assert [pair.enabled for pair in lane] == [True, False, False, True, True]


def test_map_locate_recenters_on_our_own_node_at_the_current_zoom() -> None:
    """``You`` moves the view to us and changes nothing else — not even the zoom."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [
        MapMarker("YUL-Cartierville", 45.53, -73.71, is_repeater=True),
        MapMarker("Homestead", 45.40, -73.50, is_self=True),
    ]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14)
    screen.render_body(80)
    screen.handle("pageup")  # zoom in one step, so the recentre has a zoom to preserve
    zoom = screen._viewport.zoom
    screen.handle("left")  # and pan away from wherever we are

    assert screen.fkey_lane[1].enabled is True  # we're on the map, so You can act
    screen.handle("locate")
    assert screen._viewport.center_lat == pytest.approx(45.40)
    assert screen._viewport.center_lon == pytest.approx(-73.50)
    assert screen._viewport.zoom == zoom

    # A mesh we aren't located in has nowhere to go: the chip dims and the key no-ops.
    away = MapScreen(_StubSession(80, 24), markers[:1], _StubSource(), 14)
    away.render_body(80)
    before = away._viewport
    away.handle("locate")
    assert away.fkey_lane[1].enabled is False and away._viewport is before


def test_map_echoes_the_find_query_in_the_body_only_where_the_footer_is_gone() -> None:
    """The PicoCalc draws no hint line, so the query it carries moves into the body."""
    from meshterm.platforms import PICOCALC, REGULAR, set_platform
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [MapMarker("YUL-Cartierville", 45.53, -73.71, is_repeater=True)]

    try:
        set_platform(REGULAR)
        desktop = MapScreen(_StubSession(72, 20), markers, _StubSource(), 14)
        assert len(desktop.render_body(72)) == 20
        for ch in "yul":
            desktop.handle("text", ch)
        # Unchanged: the footer already shows it, so the canvas keeps the whole body.
        assert "/yul" not in _plain(desktop.render_body(72))
        assert len(desktop.render_body(72)) == 20
        assert "find: yul" in desktop.footer_hint

        set_platform(PICOCALC)
        device = MapScreen(_StubSession(53, 23), markers, _StubSource(), 14)
        assert len(device.render_body(53)) == 23
        for ch in "yul":
            device.handle("text", ch)
        lines = device.render_body(53)
        # The echo takes the first row and the canvas gives up exactly one, so the body
        # still fills the frame it was handed rather than overflowing it.
        assert _plain(lines[0]).strip() == "/yul"
        assert len(lines) == 23
        # Clearing the find hands the row back.
        for _ in "yul":
            device.handle("backspace")
        assert len(device.render_body(53)) == 23
        assert "/" not in _plain(device.render_body(53))
    finally:
        set_platform(REGULAR)


def test_map_frame_chip_lights_only_with_matches_to_frame() -> None:
    """``Frame`` is the find's Enter under another name — dim, and inert, without a query."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [
        MapMarker("YUL-Cartierville", 45.53, -73.71, is_repeater=True),
        MapMarker("Alice", 45.40, -73.50),
    ]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14)
    screen.render_body(80)
    before = screen._viewport
    screen.handle("frame")  # no query typed: nothing to frame, so nothing moves
    assert screen.fkey_lane[2].enabled is False and screen._viewport is before

    for ch in "ali":
        screen.handle("text", ch)
    assert screen.fkey_lane[2].enabled is True
    screen.handle("frame")
    assert screen._viewport.center_lat == pytest.approx(45.40)

    # A query nothing matches has no extent either — the chip goes back to dim.
    for ch in "zzz":
        screen.handle("text", ch)
    assert screen._matches() == [] and screen.fkey_lane[2].enabled is False


def test_map_screen_find_filters_frames_and_clears() -> None:
    """Typing builds the find query; Enter frames matches; Esc peels filter then map."""
    import asyncio

    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [
        MapMarker("YUL-Cartierville", 45.53, -73.71, is_repeater=True),
        MapMarker("Alice", 45.40, -73.50),
        MapMarker("Yagi-North", 45.60, -73.65),
    ]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14)
    screen.render_body(80)

    for ch in "yu":
        screen.handle("text", ch)
    assert screen._filter == "yu"
    assert [m.label for m in screen._matches()] == ["YUL-Cartierville"]
    screen.render_body(80)
    assert "1 of 3 match" in screen.title
    assert "find: yu" in screen.footer_hint

    # Only the match keeps a label; the others dim to bare context glyphs.
    body = _plain(screen.render_body(80))
    assert "YUL-Cartierville" in body
    assert "Alice" not in body and "Yagi-North" not in body

    # Enter frames the matches: the view centres on YUL.
    screen.handle("enter")
    assert screen._viewport.center_lat == pytest.approx(45.53, abs=0.05)
    assert screen._viewport.center_lon == pytest.approx(-73.71, abs=0.05)

    # Backspace edits; Esc clears the filter first and only then dismisses.
    screen.handle("backspace")
    assert screen._filter == "y"

    async def drive() -> object:
        screen.future = asyncio.get_running_loop().create_future()
        screen.handle("escape")
        assert screen._filter == "" and not screen.future.done()
        screen.handle("escape")
        return await screen.future

    assert asyncio.run(drive()) is None


def test_map_screen_enter_zooms_in_on_a_single_match() -> None:
    """Enter on a lone filtered node homes in close on it, not the fit's neutral default."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import _FIND_ZOOM, MapScreen

    markers = [
        MapMarker("YUL-Cartierville", 45.53, -73.71, is_repeater=True),
        MapMarker("Alice", 45.40, -73.50),
    ]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 19)  # source max 19
    screen.render_body(80)
    for ch in "yul":
        screen.handle("text", ch)
    assert [m.label for m in screen._matches()] == ["YUL-Cartierville"]
    screen.handle("enter")
    assert screen._viewport.center_lat == pytest.approx(45.53, abs=0.01)
    assert screen._viewport.center_lon == pytest.approx(-73.71, abs=0.01)
    assert screen._viewport.zoom == _FIND_ZOOM  # zoomed in, not the fit's default 14


def test_map_screen_restores_and_persists_view() -> None:
    """The screen reopens on a saved view and reports every centre/zoom change."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    saved: list[tuple[float, float, int]] = []
    markers = [MapMarker("A", 45.50, -73.60), MapMarker("B", 45.40, -73.50)]
    screen = MapScreen(
        _StubSession(80, 24), markers, _StubSource(), 14,
        saved_view=(46.80, -71.20, 12),
        on_view_change=lambda vp: saved.append(
            (vp.center_lat, vp.center_lon, vp.zoom)
        ),
    )

    screen.render_body(80)
    # Restored to the saved centre/zoom, not a fit of the markers.
    assert screen._viewport.zoom == 12
    assert screen._viewport.center_lat == pytest.approx(46.80)
    assert screen._viewport.center_lon == pytest.approx(-71.20)
    assert saved == []  # reopening unchanged doesn't rewrite the stored view

    screen.handle("right")  # pan east persists the moved view
    assert saved and saved[-1][2] == 12  # zoom unchanged
    assert saved[-1][1] > -71.20  # centre moved east

    screen.handle("pageup")  # zooming in persists too
    assert saved[-1][2] == 13


async def test_open_map_focus_centres_on_the_node_without_clobbering_the_saved_view(
    ctx, monkeypatch
) -> None:
    """Opening the full map focused on a node (from its detail page) centres there, at the
    inline preview's zoom — and, being a transient peek, never overwrites the persisted
    'where you left the map' global view, even as the peek is panned and zoomed."""
    from meshterm.core.geo import clamp_lat
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import open_map
    from meshterm.ui.surface import TuiUi

    monkeypatch.setattr("meshterm.ui.map_screen.basemap_source", lambda _c: _StubSource())
    ctx.repo.set_map_view(10.0, 20.0, 8)  # where the user last left the global map

    session = _CapturingSession(80, 24, keys=("right", "pageup"))  # pan + zoom the peek
    ctx.ui = TuiUi(session)
    await open_map(
        ctx,
        [MapMarker("Hub", 45.5, -73.6, is_repeater=True)],
        focus=(45.5, -73.6),
        find="Hub",
    )

    # Opened on the node, at the detail preview's zoom (min(13, max_zoom)).
    assert session.screen._saved_view == (clamp_lat(45.5), -73.6, 13)
    assert session.screen._on_view_change is None  # a focused peek wires no persistence
    assert session.screen._filter == "Hub"  # the find opens seeded to the focused node
    # Panning/zooming the peek left the global 'where you left the map' view untouched.
    assert ctx.repo.get_map_view() == pytest.approx((10.0, 20.0, 8))
    assert session.repainted  # cleaned the terminal on the way out, like the plain open


async def test_open_map_without_focus_restores_and_persists_the_global_view(
    ctx, monkeypatch
) -> None:
    """With no focus the full map is unchanged: it reopens where the user left it and pans
    persist straight back to that global view."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import open_map
    from meshterm.ui.surface import TuiUi

    monkeypatch.setattr("meshterm.ui.map_screen.basemap_source", lambda _c: _StubSource())
    ctx.repo.set_map_view(46.80, -71.20, 12)  # the saved view to reopen on

    session = _CapturingSession(80, 24, keys=("right",))  # pan east
    ctx.ui = TuiUi(session)
    await open_map(ctx, [MapMarker("Hub", 46.8, -71.2)])

    assert session.screen._viewport.zoom == 12  # reopened on the saved view, not a node fit
    lat, lon, zoom = ctx.repo.get_map_view()
    assert zoom == 12 and lon > -71.20  # the eastward pan persisted back to the global view


def test_map_screen_seeded_find_behaves_like_a_typed_one() -> None:
    """A seeded find matches, titles, and clears exactly as if the user had typed it."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [MapMarker("Hub", 45.5, -73.6), MapMarker("Far", 45.6, -73.5)]
    screen = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14, find="Hub")
    assert [m.label for m in screen._matches()] == ["Hub"]  # only the seed's node lights
    assert "find: Hub" in screen.footer_hint  # the query shows, editable, as ever
    screen.handle("escape")  # first Esc clears the find (not the map)
    assert screen._filter == "" and len(screen._matches()) == 2


def test_map_screen_scrubs_right_edge_after_move() -> None:
    """A move asks the session to scrub the right edge once, to clear any braille smear."""
    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    markers = [MapMarker("A", 45.5, -73.6)]
    braille = MapScreen(_StubSession(80, 24), markers, _StubSource(), 14)
    braille.render_body(80)
    braille.handle("right")  # a move flags the edge for a scrub
    assert braille.consume_edge_scrub() == 2  # right padding + border columns
    assert braille.consume_edge_scrub() == 0  # consumed — not repeated without another move


def test_map_screen_escape_dismisses() -> None:
    """Esc resolves the screen's future with None (backs out to the menu)."""
    import asyncio

    from meshterm.ui.map_render import MapMarker
    from meshterm.ui.map_screen import MapScreen

    screen = MapScreen(_StubSession(80, 24), [MapMarker("A", 45.5, -73.6)], _StubSource(), 14)

    async def drive() -> object:
        screen.future = asyncio.get_running_loop().create_future()
        screen.handle("escape")
        return await screen.future

    assert asyncio.run(drive()) is None


def test_map_observation_round_trips_node_type(ctx) -> None:
    """A stored observation's advert type survives persistence and aggregation."""
    run_id = ctx.repo.start_run("monitor", {})
    ctx.repo.record_observation(
        run_id,
        Observation(node="a1", name="Yagi", node_type=NODE_TYPE_REPEATER, snr=6.0,
                    lat=45.5, lon=-73.5),
    )
    node = next(n for n in ctx.repo.heard_nodes() if n.node == "a1")
    assert node.is_repeater and node.node_type == NODE_TYPE_REPEATER


def test_render_map_labels_take_the_name_hue_ours_white() -> None:
    """Node labels carry their key-derived hue; our own label is white while the
    ★ glyph stays yellow; a keyless label lands on the muted grey."""
    from meshterm.ui.map_render import _SELF, MapMarker, render_map
    from meshterm.ui.widgets import name_rgb

    vp = Viewport.fit([(45.5, -73.6), (45.4, -73.5)], 120, 80, max_zoom=14)
    markers = [
        MapMarker("US", 45.5, -73.6, is_self=True, key="cc" * 32),
        MapMarker("KEYED", 45.4, -73.5, key="d4" * 32),
        MapMarker("BARE", 45.45, -73.55),
    ]
    lines = render_map(vp, {}, markers)
    assert _glyph_color(lines, "★") == parse_hex(_SELF[1])  # the glyph keeps its yellow
    assert _glyph_color(lines, "US") == (255, 255, 255)     # ...the label goes you-white
    assert _glyph_color(lines, "KEYED") == name_rgb("KEYED", "d4" * 32)
    assert _glyph_color(lines, "BARE") == (148, 163, 184)   # no key, the muted grey


def test_render_map_find_matches_still_label_white() -> None:
    """An active find filter keeps forcing matching labels to full white."""
    from meshterm.ui.map_render import MapMarker, render_map

    vp = Viewport.fit([(45.5, -73.6), (45.4, -73.5)], 120, 80, max_zoom=14)
    markers = [MapMarker("TARGET", 45.5, -73.6, key="d4" * 32)]
    lines = render_map(vp, {}, markers, find="targ")
    assert _glyph_color(lines, "TARGET") == (255, 255, 255)