app.py

#!/usr/bin/env python3
"""
Hugging Face Space app for CoEdIT Handler
"""
import gradio as gr
import sys
import os
import json
from flask import Flask, request, jsonify
from flask_cors import CORS

# Add current directory to path so we can import handler
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from handler import EndpointHandler

# Initialize the handler
print("🚀 Initializing CoEdIT Handler...")
try:
    handler = EndpointHandler("grammarly/coedit-large")
    print("✅ Handler initialized successfully")
except Exception as e:
    print(f"❌ Failed to initialize handler: {e}")
    handler = None

def process_text(text, num_return_sequences=1, temperature=1.0):
    """Process text through the CoEdIT handler"""
    if handler is None:
        return "❌ Handler not initialized. Please check the logs."
    
    try:
        # Prepare input for the handler
        inputs = {
            "inputs": [text],
            "parameters": {
                "num_return_sequences": num_return_sequences,
                "temperature": temperature
            }
        }
        
        # Process through handler
        result = handler(inputs)
        
        if result.get("success", False):
            results = result.get("results", [])
            if results:
                enhanced = results[0].get("enhanced_sentence", "")
                changes = results[0].get("changes", [])
                
                # Format the response
                response = f"**Enhanced Text:**\n{enhanced}\n\n"
                
                if changes:
                    response += "**Changes Made:**\n"
                    for i, change in enumerate(changes, 1):
                        original = change.get("original_phrase", "")
                        new = change.get("new_phrase", "")
                        if original and new:
                            response += f"{i}. '{original}' → '{new}'\n"
                
                return response
            else:
                return "No results returned."
        else:
            return f"❌ Error: {result.get('error', 'Unknown error')}"
            
    except Exception as e:
        return f"❌ Error processing text: {str(e)}"

# Create Gradio interface
def create_interface():
    with gr.Blocks(title="CoEdIT Handler", theme=gr.themes.Soft()) as demo:
        gr.Markdown("""
        # CoEdIT Text Editor
        
        This is a custom handler for the Grammarly CoEdIT model, providing grammar correction and text enhancement.
        """)
        
        with gr.Row():
            with gr.Column():
                input_text = gr.Textbox(
                    label="Input Text",
                    placeholder="Fix the grammar: When I grow up, I start to understand what he said is quite right.",
                    lines=3
                )
                
                with gr.Row():
                    num_sequences = gr.Slider(
                        minimum=1,
                        maximum=5,
                        value=1,
                        step=1,
                        label="Number of variations"
                    )
                    
                    temperature = gr.Slider(
                        minimum=0.1,
                        maximum=2.0,
                        value=1.0,
                        step=0.1,
                        label="Temperature"
                    )
                
                process_btn = gr.Button("Process Text", variant="primary")
                
            with gr.Column():
                output_text = gr.Markdown(label="Enhanced Text")
        
        # Example texts
        gr.Examples(
            examples=[
                "Fix the grammar: When I grow up, I start to understand what he said is quite right.",
                "Make this text coherent: Their flight is weak. They run quickly through the tree canopy.",
                "Rewrite to make this easier to understand: A storm surge is what forecasters consider a hurricane's most treacherous aspect.",
                "Paraphrase this: Do you know where I was born?",
                "Write this more formally: omg i love that song im listening to it right now"
            ],
            inputs=input_text
        )
        
        # Event handlers
        process_btn.click(
            fn=process_text,
            inputs=[input_text, num_sequences, temperature],
            outputs=output_text
        )
        
        # API endpoint info
        gr.Markdown("""
        ## API Endpoint
        
        This Space also provides an API endpoint at `/predict` for programmatic access:
        
        ```bash
        curl -X POST "https://your-space-url.hf.space/predict" \\
             -H "Content-Type: application/json" \\
             -d '{"inputs": ["Your text here"]}'
        ```
        """)
    
    return demo

# Create Flask app for API endpoints
app = Flask(__name__)
CORS(app)  # Enable CORS for cross-origin requests

@app.route('/predict', methods=['POST'])
def api_predict():
    """API endpoint for inference calls from external applications"""
    try:
        # Get JSON data from request
        data = request.get_json()
        
        if not data:
            return jsonify({
                "success": False,
                "error": "No JSON data provided"
            }), 400
        
        # Extract inputs and parameters
        inputs = data.get('inputs', [])
        parameters = data.get('parameters', {})
        
        # If inputs is a single string, wrap it in a list
        if isinstance(inputs, str):
            inputs = [inputs]
        
        if not inputs:
            return jsonify({
                "success": False,
                "error": "No inputs provided"
            }), 400
        
        # Process through handler
        result = handler({
            "inputs": inputs,
            "parameters": parameters
        })
        
        return jsonify(result)
        
    except Exception as e:
        return jsonify({
            "success": False,
            "error": f"Error processing request: {str(e)}"
        }), 500

@app.route('/health', methods=['GET'])
def health_check():
    """Health check endpoint"""
    return jsonify({
        "status": "healthy",
        "handler_initialized": handler is not None
    })

@app.route('/info', methods=['GET'])
def api_info():
    """API information endpoint"""
    return jsonify({
        "name": "CoEdIT Grammar Corrector API",
        "version": "1.0.0",
        "description": "API for grammar correction and text enhancement using Grammarly CoEdIT model",
        "endpoints": {
            "/predict": "POST - Main inference endpoint",
            "/health": "GET - Health check",
            "/info": "GET - API information"
        },
        "input_format": {
            "inputs": "List of strings or single string to process",
            "parameters": {
                "num_return_sequences": "Number of variations to generate (default: 1)",
                "temperature": "Sampling temperature (default: 1.0)"
            }
        },
        "example_request": {
            "inputs": ["Fix the grammar: When I grow up, I start to understand what he said is quite right."],
            "parameters": {
                "num_return_sequences": 1,
                "temperature": 1.0
            }
        }
    })

# Create the interface
if __name__ == "__main__":
    demo = create_interface()
    
    # Launch both Gradio and Flask
    # Gradio will run on port 7860, Flask on port 7861
    import threading
    
    def run_flask():
        app.run(host="0.0.0.0", port=7861, debug=False)
    
    # Start Flask in a separate thread
    flask_thread = threading.Thread(target=run_flask)
    flask_thread.daemon = True
    flask_thread.start()
    
    # Launch Gradio
    demo.launch(server_name="0.0.0.0", server_port=7860)