app.py

import gradio as gr
from time import sleep
import json
from pymongo import MongoClient
from bson import ObjectId
from openai import OpenAI
openai_client = OpenAI()
import os





## Get the restaurants based on the search and location
def get_restaurants(search, location, meters):

    try:
        uri = os.environ.get('MONGODB_ATLAS_URI')
        client = MongoClient(uri)
        db_name = 'whatscooking'
        collection_name = 'restaurants'
        restaurants_collection = client[db_name][collection_name]
        trips_collection = client[db_name]['smart_trips']

    except:
        print("Error Connecting to the MongoDB Atlas Cluster")
        

    # Pre aggregate restaurants collection based on chosen location and radius, the output is stored into
    # trips_collection
    newTrip, pre_agg = pre_aggregate_meters(restaurants_collection, location, meters)

    ## Get openai embeddings
    response = openai_client.embeddings.create(
            input=search,
            model="text-embedding-3-small",
            dimensions=256
        )

    ## prepare the similarity search on current trip
    vectorQuery = {
        "$vectorSearch": {
            "index" : "vector_index",
            "queryVector": response.data[0].embedding,
            "path" : "embedding",
            "numCandidates": 10,
            "limit": 3,
            "filter": {"searchTrip": newTrip}
        }}

    ## Run the retrieved documents through a RAG system.
    restaurant_docs = list(trips_collection.aggregate([vectorQuery,
        {"$project": {"_id" : 0, "embedding": 0}}]))

    
    chat_response = openai_client.chat.completions.create(
        model="gpt-3.5-turbo-0125",
        messages=[
            {"role": "system", "content": "You are a helpful restaurant assistant. You will get a context if the  context is not relevat to the user query please address that and not provide by default the restaurants as is."},
            { "role": "user", "content": f"Find me the 2 best restaurant and why based on {search} and  {restaurant_docs}. explain trades offs and why I should go to each one. You can mention the third option as a possible alternative."}
        ]
        )

    ## Removed the temporary documents
    trips_collection.delete_many({"searchTrip": newTrip})

    
    if len(restaurant_docs) == 0:
        return "No restaurants found", '<iframe style="background: #FFFFFF;border: none;border-radius: 2px;box-shadow: 0 2px 10px 0 rgba(70, 76, 79, .2);" width="640" height="480" src="https://charts.mongodb.com/charts-paveldev-wiumf/embed/charts?id=65c24b0c-2215-4e6f-829c-f484dfd8a90c&filter={\'restaurant_id\':\'\'}&maxDataAge=3600&theme=light&autoRefresh=true"></iframe>', str(pre_agg), str(vectorQuery)

    ## Build the map filter
    first_restaurant = restaurant_docs[0]['restaurant_id']
    second_restaurant = restaurant_docs[1]['restaurant_id']
    third_restaurant = restaurant_docs[2]['restaurant_id']
    restaurant_string = f"'{first_restaurant}', '{second_restaurant}', '{third_restaurant}'"

   
    iframe = '<iframe style="background: #FFFFFF;border: none;border-radius: 2px;box-shadow: 0 2px 10px 0 rgba(70, 76, 79, .2);" width="640" height="480" src="https://charts.mongodb.com/charts-paveldev-wiumf/embed/charts?id=65c24b0c-2215-4e6f-829c-f484dfd8a90c&filter={\'restaurant_id\':{$in:['  + restaurant_string  + ']}}&maxDataAge=3600&theme=light&autoRefresh=true"></iframe>'
    client.close()
    return chat_response.choices[0].message.content, iframe,str(pre_agg), str(vectorQuery)
    

def pre_aggregate_meters(restaurants_collection, location, meters):

    ## Do the geo location preaggregate and assign the search trip id.
    tripId = ObjectId()
    pre_aggregate_pipeline =  [{
            "$geoNear": {
            "near": location,
            "distanceField": "distance",
            "maxDistance": meters,
            "spherical": True,
            },
        },
        {
            "$addFields": {
                "searchTrip" : tripId,
                "date" : tripId.generation_time
            }
        },
        {
            "$merge": {
                "into": "smart_trips"
            }
        } ]

    result = restaurants_collection.aggregate(pre_aggregate_pipeline);

    sleep(3)

    return tripId, pre_aggregate_pipeline


with gr.Blocks() as demo:
    gr.Markdown(
    """
    # MongoDB's Vector Restaurant planner 
    Start typing below to see the results. You can search a specific cuisine for you and choose 3 predefined locations.

    The radius specify the distance from the start search location.
    """)

    # Create the interface
    gr.Interface(
        get_restaurants,
        [gr.Textbox(placeholder="What type of dinner are you looking for?"),
         gr.Radio(choices=[
                ("Timesquare Manhattan", {
                    "type": "Point",
                    "coordinates": [-73.98527039999999, 40.7589099]
                }),
                ("Westside Manhattan", {
                    "type": "Point",
                    "coordinates": [-74.013686, 40.701975]
                }),
                ("Downtown Manhattan", {
                    "type": "Point",
                    "coordinates": [-74.000468, 40.720777]
                })
            ], label="Location", info="What location you need?"),
        gr.Slider(minimum=500, maximum=10000, randomize=False, step=5, label="Radius in meters")],
       [gr.Textbox(label="MongoDB Vector Recommendations", placeholder="Results will be displayed here"), "html",
        gr.Code(label="Pre-aggregate pipeline",language="json" ),
        gr.Code(label="Vector Query", language="json")]
    )

    
if __name__ == "__main__":
    demo.launch()