import qrcode
import cv2
from PIL import Image
import gradio as gr
import tempfile
import os
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 and return the file path
    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=".png")
    img.save(temp_file.name, format="PNG")
    temp_file.close()  # Close the file to flush contents to disk
    return temp_file.name  # Return the file path

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

    # Convert RGB to BGR format as OpenCV expects BGR
    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 with functional buttons
def create_gradio_interface():
    # QR Code Generator with Downloadable File
    def generate_qr_with_download(data):
        qr_file = generate_qr(data)  # Generate QR code file
        return qr_file  # Return file directly as downloadable output

    # QR Code Reader with Copy-to-Clipboard functionality
    def read_qr_with_copy(img):
        decoded_data = read_qr(img)  # Decode QR code
        return decoded_data, decoded_data  # Return decoded text for display and copy

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

    # Reader Interface
    read_interface = gr.Interface(
        fn=read_qr_with_copy,
        inputs=gr.Image(type="pil", label="Upload QR Code Image"),
        outputs=[
            gr.Textbox(label="Decoded Data"),  # Decoded QR code text
            gr.Textbox(visible=False),  # Invisible output for clipboard content
        ],
        title="Read QR Code",
        description="Upload an image with a QR code to decode the embedded data.",
        live=False,
    )

    # Add clipboard copy functionality using Gradio button callbacks
    def on_copy(decoded_text):
        return gr.Textbox.update(value=decoded_text)  # Update clipboard content

    # Custom UI with clipboard copy button
    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")
                qr_clipboard = gr.Textbox(visible=False)  # Clipboard value
            copy_button = gr.Button("Copy to Clipboard")
            read_interface.render()
            copy_button.click(on_copy, qr_text, qr_clipboard)

    demo.launch(share=True)

# Run the Gradio interface
create_gradio_interface()