import qrcode
import cv2
from PIL import Image
import gradio as gr
import tempfile
import numpy as np

# Function to generate a QR code
def generate_qr(data):
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=10,
        border=4,
    )
    qr.add_data(data)
    qr.make(fit=True)
    img = qr.make_image(fill="black", back_color="white")

    # Save to a temporary file
    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=".png")
    img.save(temp_file.name, format="PNG")
    temp_file.close()  # Ensure file is written to disk
    return temp_file.name, img  # Return the file path and the PIL image


# Function to read a QR code
def read_qr(img):
    # Convert PIL image to a NumPy array
    img = np.array(img)

    # Convert RGB to BGR as OpenCV expects
    if img.ndim == 3:
        img = cv2.cvtColor(img, cv2.COLOR_RGB2BGR)

    # Initialize OpenCV QR code detector
    detector = cv2.QRCodeDetector()
    data, _, _ = detector.detectAndDecode(img)
    return data if data else "No QR code found."


# Gradio Interface
def create_gradio_interface():
    # QR Code Generator with Display and Downloadable Link
    def generate_qr_interface(data):
        qr_file, qr_image = generate_qr(data)
        return qr_image, qr_file  # Show image and provide download link

    # QR Code Reader with Copy-to-Clipboard Button
    def read_qr_interface(img):
        decoded_data = read_qr(img)
        return decoded_data  # Return decoded text

    # QR Code Generator Tab
    generate_interface = gr.Interface(
        fn=generate_qr_interface,
        inputs=gr.Textbox(placeholder="Enter text or URL here...", label="Data to Encode"),
        outputs=[gr.Image(label="Generated QR Code"), gr.File(label="Download QR Code")],
        title="Generate QR Code",
        description="Quickly create a QR code from any text or URL.",
    )

    # QR Code Reader Tab
    read_interface = gr.Interface(
        fn=read_qr_interface,
        inputs=gr.Image(type="pil", label="Upload QR Code Image"),
        outputs=gr.Textbox(label="Decoded Data"),
        title="Read QR Code",
        description="Upload an image with a QR code to decode the embedded data.",
    )

    # Clipboard Functionality for "Read QR Code" Tab
    with gr.Blocks() as demo:
        gr.Markdown("## QR Code Tool: Generate and Decode with Ease")
        with gr.Tab("Generate QR Code"):
            generate_interface.render()
        with gr.Tab("Read QR Code"):
            qr_text = gr.Textbox(label="Decoded Data")  # Single box for decoded data
            copy_button = gr.Button("Copy to Clipboard")
            read_interface.render()  # Corrected placement
            copy_button.click(
                None,
                qr_text,
                qr_text,
                js="() => {navigator.clipboard.writeText(document.querySelector('input[type=text]').value); return 'Copied to Clipboard!'}"
            )

    demo.launch(share=True)


# Run the Gradio interface
create_gradio_interface()