app.py

import os
import gradio as gr
from openai import OpenAI
import json
from dotenv import load_dotenv
from db_utils import DatabaseUtils
from embedding_utils import parallel_generate_embeddings, get_embedding

# Load environment variables from .env file
load_dotenv()

def check_credentials() -> tuple[bool, str]:
    """Check if required credentials are set and valid"""
    atlas_uri = os.getenv("ATLAS_URI")
    openai_key = os.getenv("OPENAI_API_KEY")
    
    if not atlas_uri:
        return False, """Please set up your MongoDB Atlas credentials:
1. Go to Settings tab
2. Add ATLAS_URI as a Repository Secret
3. Paste your MongoDB connection string (should start with 'mongodb+srv://')"""
    
    if not openai_key:
        return False, """Please set up your OpenAI API key:
1. Go to Settings tab
2. Add OPENAI_API_KEY as a Repository Secret
3. Paste your OpenAI API key"""
        
    return True, ""

def init_clients():
    """Initialize OpenAI and MongoDB clients"""
    try:
        openai_client = OpenAI()
        db_utils = DatabaseUtils()
        return openai_client, db_utils
    except Exception as e:
        return None, None

def get_field_names(db_name: str, collection_name: str) -> list[str]:
    """Get list of fields in the collection"""
    return db_utils.get_field_names(db_name, collection_name)

def generate_embeddings_for_field(db_name: str, collection_name: str, field_name: str, embedding_field: str, limit: int = 10, progress=gr.Progress()) -> tuple[str, str]:
    """Generate embeddings for documents in parallel with progress tracking"""
    try:
        db = db_utils.client[db_name]
        collection = db[collection_name]
        
        # Count documents that need embeddings
        total_docs = collection.count_documents({field_name: {"$exists": True}})
        if total_docs == 0:
            return f"No documents found with field '{field_name}'", ""
            
        # Get total count of documents that need processing
        query = {
            field_name: {"$exists": True},
            embedding_field: {"$exists": False}  # Only get docs without embeddings
        }
        total_to_process = collection.count_documents(query)
        if total_to_process == 0:
            return "No documents found that need embeddings", ""
            
        # Apply limit if specified
        if limit > 0:
            total_to_process = min(total_to_process, limit)
            
        print(f"\nFound {total_to_process} documents that need embeddings...")
        
        # Progress tracking
        progress_text = ""
        def update_progress(prog: float, processed: int, total: int):
            nonlocal progress_text
            progress_text = f"Progress: {prog:.1f}% ({processed}/{total} documents)\n"
            print(progress_text)  # Terminal logging
            progress(prog/100, f"Processed {processed}/{total} documents")
            
        # Show initial progress
        update_progress(0, 0, total_to_process)
        
        # Create cursor for batch processing
        cursor = collection.find(query)
        if limit > 0:
            cursor = cursor.limit(limit)
            
        # Generate embeddings in parallel with cursor-based batching
        processed = parallel_generate_embeddings(
            collection=collection,
            cursor=cursor,
            field_name=field_name,
            embedding_field=embedding_field,
            openai_client=openai_client,
            total_docs=total_to_process,
            callback=update_progress
        )
                
        # Return completion message and final progress
        instructions = f"""
Successfully generated embeddings for {processed} documents using parallel processing!

To create the vector search index in MongoDB Atlas:
1. Go to your Atlas cluster
2. Click on 'Search' tab
3. Create an index named 'vector_index' with this configuration:
{{
  "fields": [
    {{
      "type": "vector",
      "path": "{embedding_field}",
      "numDimensions": 1536,
      "similarity": "dotProduct"
    }}
  ]
}}

You can now use the search tab with:
- Field to search: {field_name}
- Embedding field: {embedding_field}
"""
        return instructions, progress_text
        
    except Exception as e:
        return f"Error: {str(e)}", ""

def vector_search(query_text: str, db_name: str, collection_name: str, embedding_field: str, index_name: str) -> str:
    """Perform vector search using embeddings"""
    try:
        print(f"\nProcessing query: {query_text}")
        
        db = db_utils.client[db_name]
        collection = db[collection_name]
        
        # Get embeddings for query
        embedding = get_embedding(query_text, openai_client)
        print("Generated embeddings successfully")
        
        results = collection.aggregate([
            {
                '$vectorSearch': {
                    "index": index_name,
                    "path": embedding_field,
                    "queryVector": embedding,
                    "numCandidates": 50,
                    "limit": 5
                }
            },
            {
                "$project": {
                    "search_score": { "$meta": "vectorSearchScore" },
                    "document": "$$ROOT"
                }
            }
        ])
        
        # Format results
        results_list = list(results)
        formatted_results = []
        
        for idx, result in enumerate(results_list, 1):
            doc = result['document']
            formatted_result = f"{idx}. Score: {result['search_score']:.4f}\n"
            # Add all fields except _id and embeddings
            for key, value in doc.items():
                if key not in ['_id', embedding_field]:
                    formatted_result += f"{key}: {value}\n"
            formatted_results.append(formatted_result)
            
        return "\n".join(formatted_results) if formatted_results else "No results found"
        
    except Exception as e:
        return f"Error: {str(e)}"

# Create Gradio interface with tabs
with gr.Blocks(title="MongoDB Vector Search Tool") as iface:
    gr.Markdown("# MongoDB Vector Search Tool")
    
    # Check credentials first
    has_creds, cred_message = check_credentials()
    if not has_creds:
        gr.Markdown(f"""
        ## ⚠️ Setup Required
        
        {cred_message}
        
        After setting up credentials, refresh this page.
        """)
    else:
        # Initialize clients
        openai_client, db_utils = init_clients()
        if not openai_client or not db_utils:
            gr.Markdown("""
            ## ⚠️ Connection Error
            
            Failed to connect to MongoDB Atlas or OpenAI. Please check your credentials and try again.
            """)
        else:
            # Get available databases
            try:
                databases = db_utils.get_databases()
    
    with gr.Tab("Generate Embeddings"):
        with gr.Row():
            db_input = gr.Dropdown(
                choices=databases,
                label="Select Database",
                info="Available databases in Atlas cluster"
            )
            collection_input = gr.Dropdown(
                choices=[],
                label="Select Collection",
                info="Collections in selected database"
            )
        with gr.Row():
            field_input = gr.Dropdown(
                choices=[],
                label="Select Field for Embeddings",
                info="Fields available in collection"
            )
            embedding_field_input = gr.Textbox(
                label="Embedding Field Name",
                value="embedding",
                info="Field name where embeddings will be stored"
            )
            limit_input = gr.Number(
                label="Document Limit",
                value=10,
                minimum=0,
                info="Number of documents to process (0 for all documents)"
            )
            
        def update_collections(db_name):
            collections = db_utils.get_collections(db_name)
            # If there's only one collection, select it by default
            value = collections[0] if len(collections) == 1 else None
            return gr.Dropdown(choices=collections, value=value)
            
        def update_fields(db_name, collection_name):
            if db_name and collection_name:
                fields = get_field_names(db_name, collection_name)
                return gr.Dropdown(choices=fields)
            return gr.Dropdown(choices=[])
        
        # Update collections when database changes
        db_input.change(
            fn=update_collections,
            inputs=[db_input],
            outputs=[collection_input]
        )
        
        # Update fields when collection changes
        collection_input.change(
            fn=update_fields,
            inputs=[db_input, collection_input],
            outputs=[field_input]
        )
        
        generate_btn = gr.Button("Generate Embeddings")
        generate_output = gr.Textbox(label="Results", lines=10)
        progress_output = gr.Textbox(label="Progress", lines=3)
        
        generate_btn.click(
            generate_embeddings_for_field,
            inputs=[db_input, collection_input, field_input, embedding_field_input, limit_input],
            outputs=[generate_output, progress_output]
        )
    
    with gr.Tab("Search"):
        with gr.Row():
            search_db_input = gr.Dropdown(
                choices=databases,
                label="Select Database",
                info="Database containing the vectors"
            )
            search_collection_input = gr.Dropdown(
                choices=[],
                label="Select Collection",
                info="Collection containing the vectors"
            )
        with gr.Row():
            search_embedding_field_input = gr.Textbox(
                label="Embedding Field Name",
                value="embedding",
                info="Field containing the vectors"
            )
            search_index_input = gr.Textbox(
                label="Vector Search Index Name",
                value="vector_index",
                info="Index created in Atlas UI"
            )
            
        # Update collections when database changes
        search_db_input.change(
            fn=update_collections,
            inputs=[search_db_input],
            outputs=[search_collection_input]
        )
        
        query_input = gr.Textbox(
            label="Search Query",
            lines=2,
            placeholder="What would you like to search for?"
        )
        search_btn = gr.Button("Search")
        search_output = gr.Textbox(label="Results", lines=10)
        
        search_btn.click(
            vector_search,
            inputs=[
                query_input,
                search_db_input,
                search_collection_input,
                search_embedding_field_input,
                search_index_input
            ],
            outputs=search_output
        )

if __name__ == "__main__":
    iface.launch(server_name="0.0.0.0", server_port=7860)