app.py

from flask import Flask, request, send_file, render_template_string
import gradio as gr
import ast
import os
from io import StringIO

app = Flask(__name__)

# Mapping of Gradio components to Toga equivalents
GRADIO_TO_TOGA = {
    "Textbox": ("toga.TextInput", "placeholder='Enter Text'"),
    "Image": ("toga.Label", "Placeholder: Use file picker for image"),
    "Button": ("toga.Button", "on_press=button_handler"),
    "Markdown": ("toga.Label", ""),
    "Audio": ("toga.Label", "Placeholder: Audio not supported"),
    "Video": ("toga.Label", "Placeholder: Video not supported"),
}

# Parse Gradio app code and extract components
def parse_gradio_code(code):
    try:
        tree = ast.parse(code)
        components = []
        functions = []
        
        for node in ast.walk(tree):
            # Extract function definitions
            if isinstance(node, ast.FunctionDef):
                functions.append(node.name)
            # Extract Gradio component calls
            if isinstance(node, ast.Call) and hasattr(node.func, 'attr'):
                if node.func.attr in GRADIO_TO_TOGA:
                    component = node.func.attr
                    args = [ast.dump(arg, annotate_fields=False) for arg in node.args]
                    kwargs = {kw.arg: ast.dump(kw.value, annotate_fields=False) for kw in node.keywords}
                    components.append({"type": component, "args": args, "kwargs": kwargs})
        
        return components, functions
    except Exception as e:
        return [], [str(e)]

# Generate Toga code from parsed components
def generate_toga_code(components, functions):
    toga_code = [
        "import toga",
        "from toga.style import Pack",
        "from toga.style.pack import COLUMN, ROW",
        "import os",
        "",
        "# Placeholder for original functions",
        "# Copy your original function definitions here",
        f"# Detected functions: {', '.join(functions) if functions else 'None'}",
        "",
        "def build(app):",
        "    box = toga.Box(style=Pack(direction=COLUMN, padding=10))",
        ""
    ]
    
    for idx, comp in enumerate(components):
        toga_comp, extra = GRADIO_TO_TOGA.get(comp["type"], ("toga.Label", f"Placeholder: {comp['type']} not supported"))
        
        # Handle component-specific logic
        if comp["type"] == "Textbox":
            label = comp["kwargs"].get("label", f"'Text Input {idx}'")
            toga_code.append(f"    label_{idx} = toga.Label({label}, style=Pack(padding=(5, 5, 0, 5)))")
            toga_code.append(f"    input_{idx} = {toga_comp}(style=Pack(padding=5))")
            toga_code.append(f"    box.add(label_{idx})")
            toga_code.append(f"    box.add(input_{idx})")
        
        elif comp["type"] == "Image":
            toga_code.append(f"    image_label_{idx} = toga.Label('Image: None selected', style=Pack(padding=5))")
            toga_code.append(f"    def select_image_{idx}(widget):")
            toga_code.append(f"        path = app.main_window.open_file_dialog('Select Image', file_types=['png', 'jpg', 'jpeg'])")
            toga_code.append(f"        if path:")
            toga_code.append(f"            image_label_{idx}.text = f'Image: {{path}}'")
            toga_code.append(f"    image_button_{idx} = toga.Button('Upload Image', on_press=select_image_{idx}, style=Pack(padding=5))")
            toga_code.append(f"    box.add(toga.Label('Upload Image', style=Pack(padding=(5, 5, 0, 5))))")
            toga_code.append(f"    box.add(image_button_{idx})")
            toga_code.append(f"    box.add(image_label_{idx})")
        
        elif comp["type"] == "Button":
            label = comp["kwargs"].get("value", f"'Submit {idx}'")
            toga_code.append(f"    def button_handler_{idx}(widget):")
            toga_code.append(f"        # Placeholder: Implement logic for {functions[0] if functions else 'function'}")
            toga_code.append(f"        pass")
            toga_code.append(f"    button_{idx} = {toga_comp}(label={label}, style=Pack(padding=5))")
            toga_code.append(f"    box.add(button_{idx})")
        
        elif comp["type"] == "Markdown":
            text = comp["args"][0] if comp["args"] else "'Markdown Text'"
            toga_code.append(f"    markdown_{idx} = {toga_comp}({text}, style=Pack(padding=5, font_size=16))")
            toga_code.append(f"    box.add(markdown_{idx})")
        
        else:
            toga_code.append(f"    placeholder_{idx} = {toga_comp}('{extra}', style=Pack(padding=5))")
            toga_code.append(f"    box.add(placeholder_{idx})")
    
    toga_code.extend([
        "",
        "    return box",
        "",
        "def main():",
        "    return toga.App('Gradio to Toga App', 'org.example.gradio2toga', startup=build)",
        "",
        "if __name__ == '__main__':",
        "    main().main_loop()"
    ])
    
    return "\n".join(toga_code)

# Gradio interface for file upload
def convert_gradio_to_toga(file):
    if not file:
        return "Please upload a Gradio app Python file."
    
    try:
        # Read uploaded file
        code = file.decode('utf-8')
        components, functions = parse_gradio_code(code)
        
        if not components and functions and isinstance(functions[0], str):
            return f"Error parsing code: {functions[0]}"
        
        # Generate Toga code
        toga_code = generate_toga_code(components, functions)
        
        # Save Toga code to a temporary file
        output_path = "toga_app.py"
        with open(output_path, "w") as f:
            f.write(toga_code)
        
        return send_file(output_path, as_attachment=True, download_name="toga_app.py")
    except Exception as e:
        return f"Error: {str(e)}"

# Gradio interface
def create_gradio_interface():
    with gr.Blocks() as interface:
        gr.Markdown("# Gradio to Toga Converter")
        file_input = gr.File(label="Upload Gradio Python File")
        convert_button = gr.Button("Convert to Toga")
        output = gr.File(label="Download Toga App")
        
        convert_button.click(
            fn=convert_gradio_to_toga,
            inputs=file_input,
            outputs=output
        )
    return interface

# Flask route
@app.route('/')
def serve_gradio():
    interface = create_gradio_interface()
    # For Hugging Face Spaces, launch Gradio
    interface.launch(share=False, server_name="0.0.0.0", server_port=int(os.environ.get("PORT", 7860)))
    return render_template_string("""
    <!DOCTYPE html>
    <html>
    <head>
        <title>Gradio to Toga Converter</title>
    </head>
    <body>
        <h1>Gradio to Toga Converter</h1>
        <p>Access the Gradio interface to upload your Gradio app and download the Toga equivalent.</p>
    </body>
    </html>
    """)

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 7860)))