"""Tests for the room world: physics, collision, beacon, audio."""

import math

import pytest

from testbed.room.world import ROOM_SIZE, Room


def test_spawn_state():
    room = Room()
    assert room.capsule.x == 1.5 and room.capsule.z == 1.5
    assert room.capsule.yaw_deg == 45.0
    assert len(room.boxes) == 3


def test_move_forward_free():
    room = Room()
    moved, hit = room.move_forward(2.0)
    assert moved == pytest.approx(2.0)
    assert hit is None
    assert room.capsule.x == pytest.approx(1.5 + 2.0 * math.sin(math.radians(45)))
    assert room.capsule.z == pytest.approx(1.5 + 2.0 * math.cos(math.radians(45)))


def test_move_blocked_by_wall():
    room = Room()
    room.capsule.yaw_deg = 180.0  # toward north wall (z=0)
    moved, hit = room.move_forward(10.0)
    assert moved == pytest.approx(1.5 - room.capsule.radius, abs=1e-6)
    assert hit is not None
    assert hit.other == "wall_north"
    assert hit.normal_z == pytest.approx(1.0)
    assert hit.impulse == pytest.approx(10.0 - moved)
    assert room.capsule.z == pytest.approx(room.capsule.radius)


def test_move_blocked_by_box():
    room = Room()
    # Crate red sits at (6,6) with half-extents 1. From spawn heading 45deg.
    room.capsule.yaw_deg = 45.0
    moved, hit = room.move_forward(5.0)
    assert hit is not None
    assert hit.other == "crate_red"
    assert moved < 5.0
    # Capsule must not overlap the box.
    b = room.boxes[0]
    near_x = min(max(room.capsule.x, b.x_min()), b.x_max())
    near_z = min(max(room.capsule.z, b.z_min()), b.z_max())
    assert (
        math.hypot(room.capsule.x - near_x, room.capsule.z - near_z)
        >= room.capsule.radius - 1e-6
    )


def test_corner_push_out_of_box():
    room = Room()
    room.capsule.x = 6.0
    room.capsule.z = 6.0  # inside crate_red
    ok, hit = room._try_displace(0.1, 0.1)
    assert not ok
    assert hit is not None and hit.other == "crate_red"
    near_x = min(max(room.capsule.x, room.boxes[0].x_min()), room.boxes[0].x_max())
    near_z = min(max(room.capsule.z, room.boxes[0].z_min()), room.boxes[0].z_max())
    assert (
        math.hypot(room.capsule.x - near_x, room.capsule.z - near_z)
        >= room.capsule.radius - 1e-6
    )


def test_turn_clamps_pitch():
    room = Room()
    room.turn(yaw_deg=30.0, pitch_deg=200.0)
    assert room.capsule.pitch_deg == 85.0
    room.turn(pitch_deg=-500.0)
    assert room.capsule.pitch_deg == -85.0
    assert room.capsule.yaw_deg == pytest.approx(75.0)


def test_look_at_beacon():
    room = Room()
    yaw, _pitch = room.look_at_beacon()
    dx = room.beacon.x - room.capsule.x
    dz = room.beacon.z - room.capsule.z
    assert yaw == pytest.approx(math.degrees(math.atan2(dx, dz)))
    assert room.capsule.yaw_deg == pytest.approx(yaw)


def test_interact_requires_reach():
    room = Room()
    ok, msg = room.interact_beacon()
    assert not ok
    assert "too far" in msg
    room.capsule.x = room.beacon.x - 1.0
    room.capsule.z = room.beacon.z
    ok, msg = room.interact_beacon()
    assert ok
    assert room.beacon.active
    ok2, _ = room.interact_beacon()
    assert ok2  # already active is still a success


def test_hear_beacon_hum_only_in_range():
    room = Room()
    sounds = room.hear_now()
    assert sounds == []
    room.capsule.x = room.beacon.x - 3.0
    room.capsule.z = room.beacon.z
    sounds = room.hear_now()
    assert any(s["kind"] == "beacon_hum" for s in sounds)
    assert sounds[0]["intensity"] > 0.0


def test_queue_and_drain_audio():
    room = Room()
    room.queue_audio("thud", 90.0, 0.5)
    sounds = room.drain_audio()
    assert len(sounds) == 1
    assert room.drain_audio() == []


def test_tick_advances():
    room = Room()
    assert room.advance_tick() == 1
    assert room.advance_tick() == 2


def test_describe_layout():
    room = Room()
    d = room.describe()
    assert d["room"]["width"] == ROOM_SIZE
    assert len(d["obstacles"]) == 3
    assert d["beacon"]["id"] == "beacon"


def test_marker_is_on_a_back_face():
    """The triangle must sit on a face pointing away from the spawn corner."""
    for _ in range(20):
        room = Room()
        pos = room.marker_world_pos()
        assert pos is not None
        box = next(b for b in room.boxes if b.id == room.marker["box"])
        face = room.marker["face"]
        # spawn is at (1.5, 1.5); the marker face normal must point away from it
        to_spawn = (1.5 - box.cx, 1.5 - box.cz)
        normal = {
            "x0": (-1, 0), "x1": (1, 0), "z0": (0, -1), "z1": (0, 1),
        }[face]
        assert normal[0] * to_spawn[0] + normal[1] * to_spawn[1] < 0
        assert pos[0] == pytest.approx(box.x_max()) if face == "x1" else True


def test_marker_not_visible_from_spawn():
    """Looking toward the beacon from spawn must not show the triangle."""
    from testbed.room.render import Raycaster

    room = Room()
    # Spawn looks at the beacon; the marker is on a back face, so the anchor
    # pixel of the marker must be occluded (different surface) or off-frame.
    pos = room.marker_world_pos()
    assert pos is not None
    # Stand on the marker's side of the crate, facing it.
    face = room.marker["face"]
    offsets = {
        "x0": (-1.0, 0.0, 90.0),   # west face: stand west, face +x
        "x1": (1.0, 0.0, 270.0),   # east face: stand east, face -x
        "z0": (0.0, -1.0, 0.0),    # south face: stand south, face +z
        "z1": (0.0, 1.0, 180.0),   # north face: stand north, face -z
    }[face]
    room.capsule.x = pos[0] + offsets[0]
    room.capsule.z = pos[2] + offsets[1]
    room.capsule.yaw_deg = offsets[2]
    img, _ = Raycaster().render(room)
    px = img.load()
    orange = 0
    for y in range(0, 120, 2):
        for x in range(0, 160, 2):
            r, g, b = px[x, y]
            if r > 200 and 100 < g < 190 and b < 90:
                orange += 1
    assert orange > 3, "triangle must be visible when looking at the marker face"