Document Source
    ↓
Document Processor
    ├→ Extract text
    ├→ Process content
    └→ Generate embeddings
    ↓
Vector Database
    ↓
Chat Interface ← User Question
    ├→ Retrieve relevant content
    ├→ Maintain conversation history
    └→ Generate response

def format_response_with_citations(response: str, sources: List[Dict]) -> str:
    """Add source citations to response"""

    formatted = response + "\n\n**Sources:**\n"
    for i, source in enumerate(sources, 1):
        formatted += f"[{i}] Page {source['page']} of {source['source']}\n"
        if 'excerpt' in source:
            formatted += f"    \"{source['excerpt'][:100]}...\"\n"

    return formatted

def generate_follow_up_questions(context: str, response: str) -> List[str]:
    """Suggest follow-up questions to user"""

    prompt = f"""
    Based on this Q&A, generate 3 relevant follow-up questions:
    Context: {context[:500]}
    Response: {response[:500]}
    """

    follow_ups = llm.generate(prompt)
    return follow_ups

def handle_query_failure(question: str, error: Exception) -> str:
    """Handle when no relevant documents found"""

    if isinstance(error, NoRelevantDocuments):
        return (
            "I couldn't find information about that in the documents. "
            "Try asking about different topics like: "
            + ", ".join(get_main_topics())
        )
    elif isinstance(error, ContextTooLarge):
        return (
            "The answer requires too much context. "
            "Can you be more specific about what you'd like to know?"
        )
    else:
        return f"I encountered an issue: {str(error)[:100]}"

from langchain.document_loaders import PDFLoader
from langchain.text_splitter import CharacterTextSplitter
from langchain.embeddings import OpenAIEmbeddings
from langchain.vectorstores import Chroma
from langchain.chat_models import ChatOpenAI
from langchain.chains import ConversationalRetrievalChain

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from llama_index import GPTVectorStoreIndex, SimpleDirectoryReader, ChatMemoryBuffer
from llama_index.llms import ChatMessage, MessageRole

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from sentence_transformers import SentenceTransformer
import faiss
import numpy as np

# Retrieve documents
k = 5
distances, indices = index.search(
    np.array([q_embedding]).astype('float32'), k
)

# Get relevant documents
context = " ".join([documents[i] for i in indices[0]])

# Generate response
response = llm.generate(
    f"Context: {context}\nQuestion: {question}\nAnswer:"
)
return response

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def compare_documents(question: str, documents: List[str]):
    """Analyze and compare across multiple documents"""
    results = []

    for doc in documents:
        response = query_document(doc, question)
        results.append({
            "document": doc.name,
            "answer": response
        })

    # Compare and synthesize
    comparison = llm.generate(
        f"Compare these answers: {results}"
    )
    return comparison

class DocumentExplorer:
    def __init__(self, documents):
        self.documents = documents

    def browse_by_topic(self, topic):
        """Find documents by topic"""
        pass

    def get_related_documents(self, doc_id):
        """Find similar documents"""
        pass

    def get_key_terms(self, document):
        """Extract key terms and concepts"""
        pass