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import os
import random
from datetime import datetime, timedelta, date, time
import openai
import streamlit as st
from dotenv import load_dotenv
from typing import Dict

# Load environment variables from a .env file
load_dotenv()

# Set the OpenAI API key from the .env file
openai.api_key = os.getenv('OPENAI_API')

# List of example destinations
example_destinations: list[str] = [
    'Paris', 'London', 'New York', 'Tokyo', 'Sydney',
    'Hong Kong', 'Singapore', 'Warsaw', 'Mexico City', 'Palermo'
]

# Randomly choose a destination
random_destination: str = random.choice(example_destinations)

# Get the current time and round to the nearest 15 minutes
now_date: datetime = datetime.now()
now_date = now_date.replace(minute=now_date.minute // 15 * 15, second=0, microsecond=0)

# Split into date and time objects
now_time: time = now_date.time()
now_date: date = now_date.date() + timedelta(days=1)

def generate_prompt(
    destination: str,
    arrival_to: str,
    arrival_date: str,
    arrival_time: str,
    departure_from: str,
    departure_date: str,
    departure_time: str,
    additional_information: str,
    **kwargs: Dict[str, str]
) -> str:
    """Generate a trip schedule prompt based on the provided information."""
    return f'''
Prepare trip schedule for {destination}, based on the following information:
* Arrival To: {arrival_to}
* Arrival Date: {arrival_date}
* Arrival Time: {arrival_time}
* Departure From: {departure_from}
* Departure Date: {departure_date}
* Departure Time: {departure_time}
* Additional Notes: {additional_information}
'''.strip()

def submit() -> None:
    """Generate trip schedule based on user input and display the output."""
    prompt: str = generate_prompt(**st.session_state)

    # generate output
    output = openai.Completion.create(
        engine='gpt-3.5-turbo-instruct',
        prompt=prompt,
        temperature=0.45,
        top_p=1,
        frequency_penalty=2,
        presence_penalty=0,
        max_tokens=1024
    )
    
    st.session_state['output'] = output['choices'][0]['text']

# Initialization
if 'output' not in st.session_state:
    st.session_state['output'] = '--'

# UI Elements
st.title('GPT-3 Trip Scheduler')
st.subheader('Let us plan your trip!')

# Form for User Input
with st.form(key='trip_form'):
    c1, c2, c3 = st.columns(3)

    with c1:
        st.subheader('Destination')
        origin: str = st.text_input('Destination', value=random_destination, key='destination')
        st.form_submit_button('Submit', on_click=submit)

    with c2:
        st.subheader('Arrival')
        st.selectbox('Arrival To', ('Airport', 'Train Station', 'Bus Station', 'Ferry Terminal', 'Port', 'Other'), key='arrival_to')
        st.date_input('Arrival Date', value=now_date, key='arrival_date')
        st.time_input('Arrival Time', value=now_time, key='arrival_time')

    with c3:
        st.subheader('Departure')
        st.selectbox('Departure From', ('Airport', 'Train Station', 'Bus Station', 'Ferry Terminal', 'Port', 'Other'), key='departure_from')
        st.date_input('Departure Date', value=now_date + timedelta(days=1), key='departure_date')
        st.time_input('Departure Time', value=now_time, key='departure_time')

    st.text_area('Additional Information', height=200, value='I want to visit as many places as possible! (respect time)', key='additional_information')

# Display Generated Trip Schedule
st.subheader('Trip Schedule')
st.write(st.session_state.output)