from flask import Flask, request, jsonify, send_file
from flask_cors import CORS
import asyncio
import tempfile
import os
from threading import RLock
from huggingface_hub import InferenceClient
from all_models import models  # Importing models from all_models
from io import BytesIO  # For converting image to bytes

myapp = Flask(__name__)
CORS(myapp)  # Enable CORS for all routes

lock = RLock()
HF_TOKEN = os.environ.get("HF_TOKEN")  # Hugging Face token

inference_timeout = 600  # Set timeout for inference

@myapp.route('/')
def home():
    return "Welcome to the Image Background Remover!"

# Function to dynamically load models from the "models" list
def get_model_from_name(model_name):
    return model_name if model_name in models else None

# Asynchronous function to perform inference
async def infer(client, prompt, seed=1, timeout=inference_timeout, model="prompthero/openjourney-v4"):
    task = asyncio.create_task(
        asyncio.to_thread(client.text_to_image, prompt=prompt, seed=seed, model=model)
    )
    await asyncio.sleep(0)
    try:
        result = await asyncio.wait_for(task, timeout=timeout)
    except (Exception, asyncio.TimeoutError) as e:
        print(e)
        print(f"Task timed out for model: {model}")
        if not task.done():
            task.cancel()
        result = None
    
    if task.done() and result is not None:
        with lock:
            # Convert image result to bytes
            image_bytes = BytesIO()
            result.save(image_bytes, format='PNG')  # Save the image to a BytesIO object
            image_bytes.seek(0)  # Go to the start of the byte stream
            
            # Save the result image as a temporary file
            temp_image = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
            with open(temp_image.name, "wb") as f:
                f.write(image_bytes.read())  # Write the bytes to the temp file

        return temp_image.name  # Return the path to the saved image
    return None

# Flask route for the API endpoint
@myapp.route('/generate_api', methods=['POST'])
def generate_api():
    data = request.get_json()
    
    # Extract required fields from the request
    prompt = data.get('prompt', '')
    seed = data.get('seed', 1)
    model_name = data.get('model', 'prompthero/openjourney-v4')  # Default model

    if not prompt:
        return jsonify({"error": "Prompt is required"}), 400

    # Get the model from all_models
    model = get_model_from_name(model_name)
    if not model:
        return jsonify({"error": f"Model '{model_name}' not found in available models"}), 400

    try:
        # Create a generic InferenceClient for the model
        client = InferenceClient(token=HF_TOKEN)

        # Call the async inference function
        result_path = asyncio.run(infer(client, prompt, seed, model=model))
        if result_path:
            return send_file(result_path, mimetype='image/png')  # Send back the generated image file
        else:
            return jsonify({"error": "Failed to generate image"}), 500
    except Exception as e:
        print(f"Error in generate_api: {str(e)}")  # Log the error
        return jsonify({"error": str(e)}), 500

# Add this block to make sure your app runs when called
if __name__ == "__main__":
    myapp.run(host='0.0.0.0', port=7860)  # Run directly if needed for testing