# micro_gestures.py
# routines for detecting single-frame micro-gestures

from utils import distance_between_points, is_finger_extended

def fist_closed(landmarks):
    # all fingers curled into palm
    return all(not is_finger_extended(landmarks, finger=f) for f in ["thumb","index","middle","ring","pinky"])

def palm_open(landmarks):
    # all fingers extended
    return all(is_finger_extended(landmarks, finger=f) for f in ["thumb","index","middle","ring","pinky"])

def index_pointing_up(landmarks):
    # only index extended up
    return is_finger_extended(landmarks, "index", "up") and all(not is_finger_extended(landmarks,f) for f in ["thumb","middle","ring","pinky"])

def v_sign(landmarks):
    # index and middle extended, others curled
    return is_finger_extended(landmarks, "index") and is_finger_extended(landmarks, "middle") and all(not is_finger_extended(landmarks,f) for f in ["thumb","ring","pinky"])

def thumb_up(landmarks):
    # thumb up, others curled
    return is_finger_extended(landmarks,"thumb","up") and all(not is_finger_extended(landmarks,f) for f in ["index","middle","ring","pinky"])

def thumb_side(landmarks):
    # thumb horizontal, others curled
    return is_finger_extended(landmarks,"thumb") and all(not is_finger_extended(landmarks,f) for f in ["index","middle","ring","pinky"])

def pinky_up(landmarks):
    # only pinky extended up
    return is_finger_extended(landmarks,"pinky","up") and all(not is_finger_extended(landmarks,f) for f in ["thumb","index","middle","ring"])

def four_fingers(landmarks):
    # four fingers extended, thumb curled
    return all(is_finger_extended(landmarks,f) for f in ["index","middle","ring","pinky"]) and not is_finger_extended(landmarks,"thumb")

def ok_sign(landmarks):
    # thumb and index touching, others extended
    thumb_tip = landmarks[4]
    index_tip = landmarks[8]
    return distance_between_points(thumb_tip,index_tip) < 0.05 and all(is_finger_extended(landmarks,f) for f in ["middle","ring","pinky"])

def palm_inward(landmarks):
    # palm facing body (approximate using wrist-middle_finger vector)
    wrist = landmarks[0]
    mcp = landmarks[9]
    vector_y = mcp[1] - wrist[1]
    return vector_y > 0  # palm facing down or inward