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

def generate_qr(data: str) -> tuple:
    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")

    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

def read_qr(img: Image.Image) -> str:
    img = np.array(img)
    detector = cv2.QRCodeDetector()
    data, _, _ = detector.detectAndDecode(img)
    return data if data else "No QR code found."

def create_gradio_interface():
    def generate_qr_interface(data: str):
        qr_file, qr_image = generate_qr(data)
        return qr_image, qr_file  # Show image and provide download link

    def read_qr_interface(img: Image.Image):
        decoded_data = read_qr(img)
        return decoded_data  # Return decoded text

    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"),  # Display the QR code image
            gr.File(label="Download QR Code"),    # Downloadable link for the QR code file
        ],
        title="Generate QR Code",
        description="Quickly create a QR code from any text or URL.",
    )

    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.",
    )

    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"):
            with gr.Row():
                qr_text = gr.Textbox(label="Decoded Data")  # Single box for decoded data
                copy_button = gr.Button("Copy to Clipboard")
            read_interface.render()
            copy_button.click(
                lambda text: gr.Textbox.update(value="Copied to Clipboard!"),
                qr_text,
                qr_text,
            )

    demo.launch(share=True)

create_gradio_interface()