import cv2
import numpy as np
import glob

videos = glob.glob('output/*.mp4')
cap = cv2.VideoCapture(videos[0])
cap.set(cv2.CAP_PROP_POS_FRAMES, 500)
ret, frame = cap.read()
cap.release()

def _find_white_tab_strip(bgr: np.ndarray):
    gray = cv2.cvtColor(bgr, cv2.COLOR_BGR2GRAY)
    _, binary = cv2.threshold(gray, 200, 255, cv2.THRESH_BINARY)
    h, w = binary.shape
    row_white_counts = np.sum(binary, axis=1) / 255
    threshold = w * 0.1
    white_rows = np.where(row_white_counts > threshold)[0]
    if len(white_rows) < 2: return None
    return white_rows[0], white_rows[-1]

strip = _find_white_tab_strip(frame)
if strip:
    y1, y2 = strip
    roi = frame[y1:y2, :]
    
    gray_roi = np.max(roi, axis=2)
    _, binary = cv2.threshold(gray_roi, 200, 255, cv2.THRESH_BINARY)
    
    col_sums = np.sum(binary, axis=0) / 255
    h_roi = y2 - y1
    
    # Relaxed to 40% to survive hand occlusions. Note stems max out at ~20-30%.
    bars = np.where(col_sums > h_roi * 0.4)[0]
    
    clean_bars = []
    for x in bars:
        if not clean_bars or x - clean_bars[-1] > 20: # 20px min distance
            clean_bars.append(int(x))
            
    # Include edges
    if not clean_bars or clean_bars[0] > 50: clean_bars.insert(0, 0)
    if clean_bars[-1] < binary.shape[1] - 50: clean_bars.append(binary.shape[1])
    
    print(f"Top: {y1}, Bottom: {y2}, Height: {h_roi}")
    print(f"Detected Clean Measure Bars: {clean_bars}")
else:
    print("Could not find tab strip.")