from collections import deque
from edge.models import Keypoint, BBox
from edge.tracking import Track, TrackFrame
from edge.detectors.fall import FallDetector, FallConfig

def _standing_kps():
    kps = [Keypoint(50, 150, 0.9) for _ in range(17)]
    kps[5] = Keypoint(40, 100, 0.9); kps[6] = Keypoint(60, 100, 0.9)
    kps[11] = Keypoint(40, 200, 0.9); kps[12] = Keypoint(60, 200, 0.9)
    kps[0] = Keypoint(50, 60, 0.9)   # nose above hips
    return kps

def _lying_kps():
    kps = [Keypoint(150, 300, 0.9) for _ in range(17)]
    kps[5] = Keypoint(100, 300, 0.9); kps[6] = Keypoint(100, 310, 0.9)
    kps[11] = Keypoint(200, 300, 0.9); kps[12] = Keypoint(200, 310, 0.9)
    kps[0] = Keypoint(90, 320, 0.9)  # nose below hips
    return kps

def _track():
    return Track(1, deque(maxlen=90))

def _feed(det, track, kps, bbox, t):
    track.frames.append(TrackFrame(t, bbox, kps))
    return det.update(track, now=t)

def test_standing_produces_no_event():
    det = FallDetector(FallConfig())
    tr = _track()
    sig, _ = _feed(det, tr, _standing_kps(), BBox(40, 60, 60, 210), t=0.0)
    assert sig is None

def test_lying_confirmed_after_prone_seconds_emits_fall():
    det = FallDetector(FallConfig(prone_confirm_s=1.0))
    tr = _track()
    lying_box = BBox(90, 290, 210, 320)  # 넓고 낮음 (aspect>1.25)
    _feed(det, tr, _lying_kps(), lying_box, t=0.0)
    sig, meta = _feed(det, tr, _lying_kps(), lying_box, t=1.5)  # prone 1.5s > 1.0
    assert sig == "fall"
    assert meta["torso_angle"] > 80

def test_front_fall_height_collapse_triggers_without_angle():
    # 정면 낙상: 각도/종횡비 안 변해도 bbox 높이 급붕괴
    det = FallDetector(FallConfig(prone_confirm_s=0.5))
    tr = _track()
    tall = BBox(40, 60, 60, 210)   # height 150
    _feed(det, tr, _standing_kps(), tall, t=0.0)
    short = BBox(40, 180, 60, 210)  # height 30 (붕괴 0.8)
    _feed(det, tr, _standing_kps(), short, t=0.2)
    sig, _ = _feed(det, tr, _standing_kps(), short, t=0.9)
    assert sig == "fall"

def test_no_motion_after_fall_escalates():
    det = FallDetector(FallConfig(prone_confirm_s=0.5, no_motion_s=1.0, motion_thr=0.05))
    tr = _track()
    box = BBox(90, 290, 210, 320)
    _feed(det, tr, _lying_kps(), box, t=0.0)
    _feed(det, tr, _lying_kps(), box, t=0.6)  # -> fall
    _feed(det, tr, _lying_kps(), box, t=1.0)  # 미동 지속
    sig, _ = _feed(det, tr, _lying_kps(), box, t=2.0)  # 부동 >1.0s
    assert sig == "no_motion"

def test_recovery_clears_state():
    det = FallDetector(FallConfig(prone_confirm_s=0.5))
    tr = _track()
    box = BBox(90, 290, 210, 320)
    _feed(det, tr, _lying_kps(), box, t=0.0)
    _feed(det, tr, _lying_kps(), box, t=0.6)  # fall
    sig, _ = _feed(det, tr, _standing_kps(), BBox(40, 60, 60, 210), t=1.0)
    assert sig == "recover"

def test_low_confidence_is_ignored():
    det = FallDetector(FallConfig())
    tr = _track()
    kps = [Keypoint(0, 0, 0.1) for _ in range(17)]  # 전부 저신뢰
    sig, _ = _feed(det, tr, kps, BBox(0, 0, 100, 30), t=0.0)
    assert sig is None