import zmq
import cv2
import numpy as np

context = zmq.Context()
socket = context.socket(zmq.SUB)
socket.setsockopt(zmq.SUBSCRIBE, b"")
port = 5055
socket.connect(f"tcp://192.168.0.113:{port}")
n = 0

cv2.namedWindow('Image', cv2.WINDOW_GUI_NORMAL)
cv2.namedWindow('Debug', cv2.WINDOW_GUI_NORMAL)

lower = 100
upper = 200


def lower_update(value):
    global lower
    lower = value


def upper_update(value):
    global upper
    upper = value


cv2.createTrackbar("Lower", "Debug", lower, 255, lower_update)
cv2.createTrackbar("Upper", "Debug", upper, 255, upper_update)

while True:
    bts = socket.recv()
    n += 1
    arr = np.frombuffer(bts, np.uint8)
    image = cv2.imdecode(arr, cv2.IMREAD_COLOR)
    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    gray = cv2.GaussianBlur(gray, (7,7), 0)
    mask = cv2.Canny(gray, lower, upper)
    cnts, _ = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

    rect = cv2.minAreaRect(cnts[0])
    box = cv2.boxPoints(rect)
    box = np.intp(box)

    approx = cv2.approxPolyDP(box, 0.3, True)

    A4_shape = np.float32([[0,870], [0, 0], [620,0], [620,877]])
    A4 = np.zeros((870, 620))
    mask = cv2.getPerspectiveTransform(approx[:, 0, :].astype('float32'), A4_shape)
    only_list = cv2.warpPerspective(image, mask, (640, 480))
    cv2.putText(only_list, "Hello world", (10, 60), cv2.FONT_HERSHEY_SIMPLEX,
                0.7, (127, 255, 255))
    mask = cv2.getPerspectiveTransform(A4_shape, approx[:, 0, :].astype('float32'))
    listText = cv2.warpPerspective(only_list, mask, (640, 480))
    listText[np.all(listText < 150, axis=2)] = image[np.all(listText < 150, axis=2)]

    for pos in approx:
        cv2.circle(image, pos[0], 2, (0, 255, 0), 10)

    cv2.imshow('Image', listText)
    key = cv2.waitKey(10)
    if key == ord('q'):
        break