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from flask import Flask, render_template_string, request, jsonify
import speech_recognition as sr
from tempfile import NamedTemporaryFile
import os
import ffmpeg
import logging
from werkzeug.exceptions import BadRequest

app = Flask(__name__)
logging.basicConfig(level=logging.INFO)

# Global variables
cart = []  # To store items and prices
MENU = {
    "Biryani": {"Chicken Biryani": 150, "Veg Biryani": 120},
    "Starters": {"Chicken Wings": 180, "Paneer Tikka": 160},
    "Breads": {"Butter Naan": 40, "Roti": 30},
    "Curries": {"Butter Chicken": 200, "Dal Fry": 150},
}
suggested_category = None  # To track ongoing category suggestions

# HTML Template for Frontend
html_code = """
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>AI Dining Assistant</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            text-align: center;
            background-color: #f4f4f9;
        }
        h1 {
            color: #333;
        }
        .mic-button {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background-color: #007bff;
            color: white;
            font-size: 24px;
            border: none;
            cursor: pointer;
        }
        .status, .response {
            margin-top: 20px;
        }
    </style>
</head>
<body>
    <h1>AI Dining Assistant</h1>
    <button class="mic-button" id="mic-button">🎤</button>
    <div class="status" id="status">Press the mic button to start...</div>
    <div class="response" id="response" style="display: none;">Response will appear here...</div>
    <script>
        const micButton = document.getElementById('mic-button');
        const status = document.getElementById('status');
        const response = document.getElementById('response');
        let isListening = false;

        micButton.addEventListener('click', () => {
            if (!isListening) {
                isListening = true;
                startConversation();
            }
        });

        function startConversation() {
            const utterance = new SpeechSynthesisUtterance("Listening...");
            speechSynthesis.speak(utterance);
            utterance.onend = () => {
                status.textContent = "Listening...";
                startListening();
            };
        }

        async function startListening() {
            const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
            const mediaRecorder = new MediaRecorder(stream, { mimeType: "audio/webm;codecs=opus" });
            const audioChunks = [];

            mediaRecorder.ondataavailable = (event) => audioChunks.push(event.data);
            mediaRecorder.onstop = async () => {
                const audioBlob = new Blob(audioChunks, { type: "audio/webm" });
                const formData = new FormData();
                formData.append("audio", audioBlob);

                status.textContent = "Processing...";
                try {
                    const result = await fetch("/process-audio", { method: "POST", body: formData });
                    const data = await result.json();
                    response.textContent = data.response;
                    response.style.display = "block";

                    const utterance = new SpeechSynthesisUtterance(data.response);
                    speechSynthesis.speak(utterance);
                    utterance.onend = () => {
                        if (!data.response.includes("Goodbye") && !data.response.includes("final order")) {
                            startConversation(); // Continue listening
                        } else {
                            status.textContent = "Conversation ended.";
                            isListening = false;
                        }
                    };
                } catch (error) {
                    response.textContent = "Error processing your request. Please try again.";
                    status.textContent = "Press the mic button to restart.";
                    isListening = false;
                }
            };

            mediaRecorder.start();
            setTimeout(() => mediaRecorder.stop(), 5000); // Stop recording after 5 seconds
        }
    </script>
</body>
</html>
"""

@app.route("/")
def index():
    return render_template_string(html_code)

@app.route("/process-audio", methods=["POST"])
def process_audio():
    global suggested_category
    try:
        audio_file = request.files.get("audio")
        if not audio_file:
            raise BadRequest("No audio file provided.")

        temp_file = NamedTemporaryFile(delete=False, suffix=".webm")
        audio_file.save(temp_file.name)

        if os.path.getsize(temp_file.name) == 0:
            raise BadRequest("Uploaded audio file is empty.")

        converted_file = NamedTemporaryFile(delete=False, suffix=".wav")
        ffmpeg.input(temp_file.name).output(
            converted_file.name, acodec="pcm_s16le", ac=1, ar="16000"
        ).run(overwrite_output=True)

        recognizer = sr.Recognizer()
        with sr.AudioFile(converted_file.name) as source:
            audio_data = recognizer.record(source)
            try:
                command = recognizer.recognize_google(audio_data)
                response = process_command(command)
            except sr.UnknownValueError:
                response = "Sorry, I could not understand. Please try again."

        return jsonify({"response": response})

    except BadRequest as br:
        return jsonify({"response": f"Bad Request: {str(br)}"}), 400
    except Exception as e:
        return jsonify({"response": f"An error occurred: {str(e)}"}), 500
    finally:
        os.unlink(temp_file.name)
        os.unlink(converted_file.name)

def process_command(command):
    global cart, MENU, suggested_category
    command = command.lower()
    all_items = {item.lower(): (category, price) for category, items in MENU.items() for item, price in items.items()}

    # Handle ongoing suggestion
    if suggested_category:
        if command in [item.lower() for item in MENU[suggested_category].keys()]:
            item = command.title()
            price = MENU[suggested_category][item]
            cart.append((item, price))
            total = sum(item[1] for item in cart)
            cart_summary = ", ".join([f"{i[0]} (₹{i[1]})" for i in cart])
            suggested_category = None  # Reset category suggestion
            return f"{item} added to your cart for ₹{price}. Your cart: {cart_summary}. Total: ₹{total}. Do you want to order anything else?"

    # Handle category suggestion
    categories = {category.lower(): category for category in MENU.keys()}
    if any(cat in command for cat in categories.keys()):
        suggested_category = categories[next(cat for cat in categories.keys() if cat in command)]
        items = ", ".join(MENU[suggested_category].keys())
        return f"{suggested_category.capitalize()} options are: {items}. Which one would you like?"

    # Handle final order
    elif "final order" in command or "submit" in command:
        if cart:
            items = ", ".join([f"{item[0]} (₹{item[1]})" for item in cart])
            total = sum(item[1] for item in cart)
            cart.clear()
            return f"Your final order is: {items}. Total price: ₹{total}. Thank you for ordering!"
        else:
            return "Your cart is empty. Please add items first."

    # Handle goodbye
    elif "no" in command or "nothing" in command or "goodbye" in command:
        cart.clear()
        return "Goodbye! Thank you for using AI Dining Assistant."

    return "Sorry, I didn't understand that. Please try again."

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=7860)