import os
import time
import logging
import json
import requests
import torch
from flask import Flask, render_template, request, jsonify, session
from flask_session import Session
from simple_salesforce import Salesforce
from transformers import pipeline, AutoConfig
from gtts import gTTS
from pydub import AudioSegment
from pydub.silence import detect_nonsilent
from waitress import serve

app = Flask(__name__)

# Configure Flask session
app.secret_key = os.getenv("SECRET_KEY", "sSSjyhInIsUohKpG8sHzty2q")
app.config["SESSION_TYPE"] = "filesystem"
app.config["SESSION_COOKIE_NAME"] = "my_session"
app.config["SESSION_COOKIE_SECURE"] = True
app.config["SESSION_COOKIE_SAMESITE"] = "None"
Session(app)

# Set up logging
logging.basicConfig(level=logging.INFO)

# Connect to Salesforce
try:
    print("Attempting to connect to Salesforce...")
    sf = Salesforce(username='diggavalli98@gmail.com', password='Sati@1020', security_token='sSSjyhInIsUohKpG8sHzty2q')
    print("Connected to Salesforce successfully!")
except Exception as e:
    print(f"Failed to connect to Salesforce: {str(e)}")

# Whisper ASR Configuration
device = "cuda" if torch.cuda.is_available() else "cpu"
config = AutoConfig.from_pretrained("openai/whisper-small")
config.update({"timeout": 60})

# Voice prompts for registration
prompts = {
    "welcome": "Welcome to Biryani Hub.",
    "ask_name": "Tell me your name.",
    "ask_email": "Please provide your email address.",
    "thank_you": "Thank you for registration."
}

def generate_audio_prompt(text, filename):
    try:
        tts = gTTS(text)
        tts.save(os.path.join("static", filename))
    except gtts.tts.gTTSError as e:
        print(f"Error: {e}")
        print("Retrying after 5 seconds...")
        time.sleep(5)
        generate_audio_prompt(text, filename)

for key, text in prompts.items():
    generate_audio_prompt(text, f"{key}.mp3")

# Function to convert audio to WAV format
def convert_to_wav(input_path, output_path):
    try:
        audio = AudioSegment.from_file(input_path)
        audio = audio.set_frame_rate(16000).set_channels(1)
        audio.export(output_path, format="wav")
    except Exception as e:
        raise Exception(f"Audio conversion failed: {str(e)}")

# Function to check if audio contains actual speech
def is_silent_audio(audio_path):
    audio = AudioSegment.from_wav(audio_path)
    nonsilent_parts = detect_nonsilent(audio, min_silence_len=500, silence_thresh=audio.dBFS-16)
    return len(nonsilent_parts) == 0

@app.route("/")
def index():
    return render_template("index.html")

# ✅ LOGIN ENDPOINT (Validates Existing Users)
@app.route('/login', methods=['POST'])
def login():
    data = request.json
    email = data.get('email').strip().lower()
    phone_number = data.get('phone_number').strip()

    if not email or not phone_number:
        return jsonify({'error': 'Missing email or phone number'}), 400

    try:
        print(f"🔍 Checking login for Email: {email}, Phone: {phone_number}")

        query = f"SELECT Id, Name FROM Customer_Login__c WHERE LOWER(Email__c) = '{email}' AND Phone_Number__c = '{phone_number}' LIMIT 1"
        result = sf.query(query)

        if result['totalSize'] == 0:
            print("❌ No matching records found!")
            return jsonify({'error': 'Invalid email or phone number. User not found'}), 401

        user_data = result['records'][0]
        session['user_id'] = user_data['Id']
        session['name'] = user_data['Name']
        print("✅ User found:", user_data)

        return jsonify({'success': True, 'message': 'Login successful', 'user_id': user_data['Id'], 'name': user_data['Name']}), 200

    except requests.exceptions.RequestException as req_error:
        print("🔴 Salesforce Connection Error:", req_error)
        return jsonify({'error': f'Salesforce connection error: {str(req_error)}'}), 500
    except Exception as e:
        print("🚨 Unexpected Error:", e)
        return jsonify({'error': f'Unexpected error: {str(e)}'}), 500

# ✅ REGISTRATION ENDPOINT (Creates New User)
@app.route("/register", methods=["POST"])
def register():
    data = request.json
    name = data.get('name')
    email = data.get('email').strip().lower()
    phone = data.get('phone').strip()

    if not name or not email or not phone:
        return jsonify({'error': 'Missing data'}), 400

    try:
        query = f"SELECT Id FROM Customer_Login__c WHERE LOWER(Email__c) = '{email}' AND Phone_Number__c = '{phone}' LIMIT 1"
        existing_user = sf.query(query)

        if existing_user['totalSize'] > 0:
            return jsonify({'error': 'User already exists'}), 409

        customer_login = sf.Customer_Login__c.create({
            'Name': name,
            'Email__c': email,
            'Phone_Number__c': phone
        })

        if customer_login.get('id'):
            return jsonify({'success': True, 'user_id': customer_login['id']}), 200
        else:
            return jsonify({'error': 'Failed to create record'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500

# ✅ TRANSCRIPTION ENDPOINT (Converts Speech to Text)
@app.route("/transcribe", methods=["POST"])
def transcribe():
    if "audio" not in request.files:
        return jsonify({"error": "No audio file provided"}), 400

    audio_file = request.files["audio"]
    input_audio_path = os.path.join("static", "temp_input.wav")
    output_audio_path = os.path.join("static", "temp.wav")
    audio_file.save(input_audio_path)

    try:
        convert_to_wav(input_audio_path, output_audio_path)

        if is_silent_audio(output_audio_path):
            return jsonify({"error": "No speech detected. Please try again."}), 400

        result = pipeline("automatic-speech-recognition", model="openai/whisper-small", device=0 if torch.cuda.is_available() else -1, config=config)
        transcribed_text = result(output_audio_path)["text"].strip().capitalize()

        return jsonify({"text": transcribed_text})

    except Exception as e:
        return jsonify({"error": f"Speech recognition error: {str(e)}"}), 500

# Start Production Server
if __name__ == "__main__":
    serve(app, host="0.0.0.0", port=7860)