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import os
import random
from datetime import datetime, timedelta

import openai
import streamlit as st
from dotenv import load_dotenv

load_dotenv()

openai.api_key = os.getenv('OPENAI_API_KEY')

# Functions to generate prompt and trip schedule based on user input
example_destinations = ['Paris', 'London', 'New York', 'Tokyo', 'Sydney', 'Hong Kong', 'Singapore', 'Warsaw', 'Mexico City', 'Palermo']
random_destination = random.choice(example_destinations)

now_date = datetime.now()

# round to nearest 15 minutes
now_date = now_date.replace(minute=now_date.minute // 15 * 15, second=0, microsecond=0)

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

def generate_prompt(destination, arrival_to, arrival_date, arrival_time, departure_from, departure_date, departure_time, additional_information, **kwargs):
    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():    
    prompt = generate_prompt(**st.session_state)

    # generate output
    output = openai.Completion.create(
        engine='text-davinci-003',
        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'] = '--'

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 = 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')

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