import os
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline
from huggingface_hub import login

# Get Hugging Face token securely from environment variables
HF_TOKEN = os.getenv("HF_TOKEN")

# Authenticate with Hugging Face
if HF_TOKEN:
    login(HF_TOKEN)
else:
    raise ValueError("🚨 Hugging Face token not found! Please add it to Secrets in your Hugging Face Space.")

# Load AI model (Optimized for T4 GPU)
model_name = "TheBloke/Mistral-7B-Instruct-v0.1-AWQ"
tokenizer = AutoTokenizer.from_pretrained(model_name, token=HF_TOKEN)
model = AutoModelForCausalLM.from_pretrained(
    model_name, token=HF_TOKEN, device_map="auto", trust_remote_code=True
)

chatbot = pipeline("text-generation", model=model, tokenizer=tokenizer, device=0)

def generate_itinerary(destination, start_date, end_date, traveler_type, companion):
    """Generates an AI-powered travel itinerary based on user preferences"""

    prompt = f"""
    You are a professional travel assistant. Create a **day-by-day itinerary** for a trip to {destination}.
    - 📅 **Dates**: {start_date} to {end_date}
    - 🎭 **Traveler Type**: {traveler_type}
    - 🧳 **Companion**: {companion}
    - Provide **3 activities per day**: 🌅 Morning, ☀️ Afternoon, 🌙 Night.
    - Include **real attractions, famous landmarks, hidden gems, and local experiences**.
    - Keep responses **structured, short, and engaging**.

    📌 **Example Format**:
    **Day 1**:
    - 🌅 **Morning**: Visit [Famous Landmark] in {destination}
    - ☀️ **Afternoon**: Try [Local Food] at [Best Restaurant]
    - 🌙 **Night**: Experience [Cultural/Nightlife Activity]
    """

    response = chatbot(prompt, max_length=250, do_sample=True, temperature=0.6, top_p=0.85)
    return response[0]['generated_text']

# Creating a simple user interface
interface = gr.Interface(
    fn=generate_itinerary,
    inputs=[
        gr.Textbox(label="Destination"),
        gr.Textbox(label="Start Date (YYYY-MM-DD)"),
        gr.Textbox(label="End Date (YYYY-MM-DD)"),
        gr.Dropdown(["Art", "Food", "Nature", "Culture", "Nightlife"], label="Traveler Type"),
        gr.Dropdown(["Alone", "With Family", "With Friends", "With Partner"], label="Companion Type"),
    ],
    outputs="text",
    title="✈️ AI Travel Assistant",
    description="Enter your details, and let AI plan your perfect trip!"
)

interface.launch()