import random

import cv2
import numpy as np
import qrcode


def add_watermark_to_image(img, watermark_label, watermark_class_id):
    """
    Adds a QR code watermark to the image based on the given label and returns the updated label information.

    Args:
        img (numpy.ndarray): The original image.
        watermark_label (str): The text label to encode into the QR code.
        watermark_class_id (int): The class ID for the watermark.

    Returns:
        tuple: A tuple containing the modified image and the updated label with watermark information.
    """
    # Generate the QR code for the watermark label
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=2,
        border=1
    )
    qr.add_data(watermark_label)
    qr.make(fit=True)
    qr_img = qr.make_image(fill='black', back_color='white').convert('RGB')

    # Convert the PIL image to a NumPy array without resizing
    qr_img = np.array(qr_img)

    # Image and QR code sizes
    img_h, img_w = img.shape[:2]
    qr_h, qr_w = qr_img.shape[:2]

    # Calculate random position ensuring QR code stays within image bounds
    max_x = img_w - qr_w
    max_y = img_h - qr_h

    if max_x < 0 or max_y < 0:
        raise ValueError("QR code size exceeds image dimensions.")

    x_start = random.randint(0, max_x)
    y_start = random.randint(0, max_y)
    x_end = x_start + qr_w
    y_end = y_start + qr_h

    # Crop the QR code if it exceeds image boundaries (shouldn't happen but for safety)
    qr_img_cropped = qr_img[:y_end - y_start, :x_end - x_start]

    # Place the QR code on the original image
    img[y_start:y_end, x_start:x_end] = cv2.addWeighted(
        img[y_start:y_end, x_start:x_end], 0.4, qr_img_cropped, 0.6, 0
    )

    # Calculate the normalized bounding box coordinates and class
    x_center = (x_start + x_end) / 2 / img_w
    y_center = (y_start + y_end) / 2 / img_h
    w = qr_w / img_w
    h = qr_h / img_h

    # Create the watermark label in dataset format
    watermark_annotation = np.array([x_center, y_center, w, h, watermark_class_id])

    return img, watermark_annotation


def detect_and_decode_qr_code(image):
    """
    Detect and decode a QR code in an image.

    Args:
        image (numpy.ndarray): The image containing the QR code.

    Returns:
        str: The decoded text from the QR code.
        tuple: The coordinates of the QR code's bounding box.
    """
    # Initialize the QRCode detector
    qr_code_detector = cv2.QRCodeDetector()

    # Detect and decode the QR code
    decoded_text, points, _ = qr_code_detector.detectAndDecode(image)

    if points is not None:
        # Convert to integer type
        points = points[0].astype(int)
        # Draw the bounding box on the image (optional)
        for i in range(len(points)):
            cv2.line(image, tuple(points[i]), tuple(points[(i + 1) % len(points)]), (255, 0, 0), 2)
        return decoded_text, points
    else:
        return None, None


if __name__ == '__main__':
    img_path = './000004.jpg'
    img_wm_path = './000004_wm.jpg'
    img_label_path = './000004_wm.txt'
    watermark_data = '1722996519.rfdgkDdI7WiB'
    # watermark_data = '1722996519.rfdgkDdI7WiBm8DrM4LcBbMgF05NPYbH1d/YG6eCye1qmXFOVosuC0uxLjbEiw3PRNsRqe5vJ+j7n0GYvfvMnw=='

    img = cv2.imread(img_path)
    r = min(640 / img.shape[0], 640 / img.shape[1])
    resized_img = cv2.resize(img, (int(img.shape[1] * r), int(img.shape[0] * r)),
                             interpolation=cv2.INTER_LINEAR).astype(np.uint8)

    # 添加水印测试
    img, watermark_annotation = add_watermark_to_image(resized_img, watermark_data, 0)
    cv2.imwrite(img_wm_path, img)
    x1, y1, x2, y2, class_id = watermark_annotation

    with open(img_label_path, "w") as f:
        f.write(f"{int(class_id)} {x1} {y1} {x2} {y2}\n")

    img = cv2.imread(img_wm_path)

    width, height = img.shape[1], img.shape[0]
    x_center, y_center, w, h, _ = watermark_annotation[:5]

    # Convert normalized coordinates to image coordinates
    x_center *= width
    y_center *= height
    w *= width
    h *= height

    # Calculate bounding box coordinates
    x1 = int(x_center - w / 2)
    y1 = int(y_center - h / 2)
    x2 = int(x_center + w / 2)
    y2 = int(y_center + h / 2)

    # Ensure coordinates are within image bounds
    x1 = max(0, x1)
    y1 = max(0, y1)
    x2 = min(width, x2)
    y2 = min(height, y2)

    # Extract the QR code area
    qr_area = img[y1:y2, x1:x2]

    decoded_text, points = detect_and_decode_qr_code(img)
    print(decoded_text)
    # Detect and decode QR code from the extracted area
    # decoded_text, points = detect_and_decode_qr_code(qr_area)
    print(len(watermark_data))
    print(decoded_text == watermark_data)