app.py

import transformers
import pickle
import os
import numpy as np
import torchvision
import nltk
import torch
import pandas as pd
import requests
import zipfile
import tempfile
from PyPDF2 import PdfReader
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from transformers import (
    AutoTokenizer,
    AutoModelForSeq2SeqLM,
    AutoModelForTokenClassification,
    AutoModelForCausalLM,
    pipeline, 
    Qwen2Tokenizer, 
    BartForConditionalGeneration
)
from sentence_transformers import SentenceTransformer, CrossEncoder, util
from sklearn.metrics.pairwise import cosine_similarity
from bs4 import BeautifulSoup
from huggingface_hub import hf_hub_download
from safetensors.torch import load_file 
from typing import List, Dict, Optional
from safetensors.numpy import load_file
from safetensors.torch import safe_open
nltk.download('punkt_tab')

# Initialize FastAPI app
app = FastAPI()

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Global variables for models and data
models = {}
data = {}

class QueryRequest(BaseModel):
    query: str
    language_code: int = 1

class MedicalProfile(BaseModel):
    conditions: str
    daily_symptoms: str

class ChatQuery(BaseModel):
    query: str
    language_code: int = 1
    conversation_id: str

class ChatMessage(BaseModel):
    role: str
    content: str
    timestamp: str

def init_nltk():
    """Initialize NLTK resources"""
    try:
        nltk.download('punkt', quiet=True)
        return True
    except Exception as e:
        print(f"Error initializing NLTK: {e}")
        return False

def load_models():
    """Initialize all required models"""
    try:
        print("Loading models...")

        # Set device
        device = "cuda" if torch.cuda.is_available() else "cpu"
        print(f"Device set to use {device}")

        # Embedding models
        models['embedding_model'] = SentenceTransformer('sentence-transformers/all-MiniLM-L6-v2')
        models['cross_encoder'] = CrossEncoder('cross-encoder/ms-marco-MiniLM-L-6-v2', max_length=512)
        models['semantic_model'] = SentenceTransformer('all-MiniLM-L6-v2')

        # Translation models
        models['ar_to_en_tokenizer'] = AutoTokenizer.from_pretrained("Helsinki-NLP/opus-mt-ar-en")
        models['ar_to_en_model'] = AutoModelForSeq2SeqLM.from_pretrained("Helsinki-NLP/opus-mt-ar-en")
        models['en_to_ar_tokenizer'] = AutoTokenizer.from_pretrained("Helsinki-NLP/opus-mt-en-ar")
        models['en_to_ar_model'] = AutoModelForSeq2SeqLM.from_pretrained("Helsinki-NLP/opus-mt-en-ar")

        #Attention model
        models['att_tokenizer'] = AutoTokenizer.from_pretrained("facebook/bart-base")
        models['att_model'] = BartForConditionalGeneration.from_pretrained("facebook/bart-base")
        
        # NER model
        models['bio_tokenizer'] = AutoTokenizer.from_pretrained("blaze999/Medical-NER")
        models['bio_model'] = AutoModelForTokenClassification.from_pretrained("blaze999/Medical-NER")
        models['ner_pipeline'] = pipeline("ner", model=models['bio_model'], tokenizer=models['bio_tokenizer'])

        # LLM model
        model_name = "M4-ai/Orca-2.0-Tau-1.8B"
        models['llm_tokenizer'] = AutoTokenizer.from_pretrained(model_name)
        models['llm_model'] = AutoModelForCausalLM.from_pretrained(model_name)

        print("Models loaded successfully")
        return True
    except Exception as e:
        print(f"Error loading models: {e}")
        return False

def load_embeddings() -> Optional[Dict[str, np.ndarray]]:
    try:
        # Locate or download embeddings file
        embeddings_path = 'embeddings.safetensors'
        if not os.path.exists(embeddings_path):
            print("File not found locally. Attempting to download from Hugging Face Hub...")
            embeddings_path = hf_hub_download(
                repo_id=os.environ.get('HF_SPACE_ID', 'thechaiexperiment/TeaRAG'),
                filename="embeddings.safetensors",
                repo_type="space"
            )
        
        # Initialize a dictionary to store embeddings
        embeddings = {}

        # Open the safetensors file
        with safe_open(embeddings_path, framework="pt") as f:
            keys = f.keys()
            #0print(f"Available keys in the .safetensors file: {list(keys)}")  # Debugging info

            # Iterate over the keys and load tensors
            for key in keys:
                try:
                    tensor = f.get_tensor(key)
                    if not isinstance(tensor, torch.Tensor):
                        raise TypeError(f"Value for key {key} is not a valid PyTorch tensor.")
                    
                    # Convert tensor to NumPy array
                    embeddings[key] = tensor.numpy()
                except Exception as key_error:
                    print(f"Failed to process key {key}: {key_error}")

        if embeddings:
            print("Embeddings successfully loaded.")
        else:
            print("No embeddings could be loaded. Please check the file format and content.")
        
        return embeddings

    except Exception as e:
        print(f"Error loading embeddings: {e}")
        return None

def load_recipes_embeddings() -> Optional[Dict[str, np.ndarray]]:
    try:
        # Locate or download the embeddings file
        embeddings_path = 'recipes_embeddings.safetensors'
        if not os.path.exists(embeddings_path):
            print("File not found locally. Attempting to download from Hugging Face Hub...")
            embeddings_path = hf_hub_download(
                repo_id=os.environ.get('HF_SPACE_ID', 'thechaiexperiment/TeaRAG'),
                filename="embeddings.safetensors",
                repo_type="space"
            )
        # Initialize a dictionary to store embeddings
        embeddings = {}
        # Open the safetensors file
        with safe_open(embeddings_path, framework="pt") as f:
            keys = list(f.keys())
            #print(f"Available keys in the .safetensors file: {keys}")  # Debugging info

            # Iterate over the keys and load tensors
            for key in keys:
                try:
                    tensor = f.get_tensor(key)  # Get the tensor associated with the key
                    if tensor.shape[0] != 384:  # Optional: Validate tensor shape
                        print(f"Warning: Tensor for key {key} has unexpected shape {tensor.shape}")
                    
                    # Convert tensor to NumPy array
                    embeddings[key] = tensor.numpy()
                except Exception as key_error:
                    print(f"Failed to process key {key}: {key_error}")

        if embeddings:
            print(f"Successfully loaded {len(embeddings)} embeddings.")
        else:
            print("No embeddings could be loaded. Please check the file format and content.")
        
        return embeddings

    except Exception as e:
        print(f"Error loading embeddings: {e}")
        return None

def load_documents_data(folder_path='downloaded_articles/downloaded_articles'):
    """Load document data from HTML articles in a specified folder."""
    try:
        print("Loading documents data...")
        # Check if the folder exists
        if not os.path.exists(folder_path) or not os.path.isdir(folder_path):
            print(f"Error: Folder '{folder_path}' not found")
            return False
        # List all HTML files in the folder
        html_files = [f for f in os.listdir(folder_path) if f.endswith('.html')]
        if not html_files:
            print(f"No HTML files found in folder '{folder_path}'")
            return False
        documents = []
        # Iterate through each HTML file and parse the content
        for file_name in html_files:
            file_path = os.path.join(folder_path, file_name)
            try:
                with open(file_path, 'r', encoding='utf-8') as file:
                    # Parse the HTML file
                    soup = BeautifulSoup(file, 'html.parser')
                    # Extract text content (or customize this as per your needs)
                    text = soup.get_text(separator='\n').strip()
                    documents.append({"file_name": file_name, "content": text})
            except Exception as e:
                print(f"Error reading file {file_name}: {e}")
        # Convert the list of documents to a DataFrame
        data['df'] = pd.DataFrame(documents)
        
        if data['df'].empty:
            print("No valid documents loaded.")
            return False
        print(f"Successfully loaded {len(data['df'])} document records.")
        return True
    except Exception as e:
        print(f"Error loading documents data: {e}")
        data['df'] = pd.DataFrame()
        return False

def load_recipes_data(folder_path='pdf kb.zip'):
    try:
        print("Loading documents data...")
        temp_dir = None

        # Handle .zip file
        if folder_path.endswith('.zip'):
            if not os.path.exists(folder_path):
                print(f"Error: .zip file '{folder_path}' not found.")
                return False

            # Create a temporary directory for extracting the .zip
            temp_dir = tempfile.TemporaryDirectory()
            extract_path = temp_dir.name

            # Extract the .zip file
            try:
                with zipfile.ZipFile(folder_path, 'r') as zip_ref:
                    zip_ref.extractall(extract_path)
                print(f"Extracted .zip file to temporary folder: {extract_path}")
            except Exception as e:
                print(f"Error extracting .zip file: {e}")
                return False

            # Update the folder_path to the extracted directory
            folder_path = extract_path

        # Check if the folder exists
        if not os.path.exists(folder_path) or not os.path.isdir(folder_path):
            print(f"Error: Folder '{folder_path}' not found.")
            return False

        # List all HTML or PDF files in the folder
        html_files = [f for f in os.listdir(folder_path) if f.endswith('.html')]
        pdf_files = [f for f in os.listdir(folder_path) if f.endswith('.pdf')]

        if not html_files and not pdf_files:
            print(f"No HTML or PDF files found in folder '{folder_path}'.")
            return False

        documents = []

        # Process PDF files (requires a PDF parser like PyPDF2)
        for file_name in pdf_files:
            file_path = os.path.join(folder_path, file_name)
            try:
                from PyPDF2 import PdfReader  # Import here to avoid dependency issues
                reader = PdfReader(file_path)
                text = "\n".join(page.extract_text() for page in reader.pages if page.extract_text())
                documents.append({"file_name": file_name, "content": text})
            except Exception as e:
                print(f"Error reading PDF file {file_name}: {e}")

        # Convert the list of documents to a DataFrame
        data['df'] = pd.DataFrame(documents)

        if data['df'].empty:
            print("No valid documents loaded.")
            return False

        print(f"Successfully loaded {len(data['df'])} document records.")
        return True
    except Exception as e:
        print(f"Error loading documents data: {e}")
        data['df'] = pd.DataFrame()
        return False
    finally:
        # Clean up the temporary directory, if created
        if temp_dir:
            temp_dir.cleanup()

def load_data():
    """Load all required data"""
    embeddings_success = load_embeddings()
    documents_success = load_documents_data()
    recipes_success = load_recipes_data()
    recipes_embeddings_success = load_recipes_embeddings()
    if not recipes_embeddings_success:
        print("Warning: Failed to load embeddings, falling back to basic functionality")
    if not recipes_success:
        print("Warning: Failed to load documents data, falling back to basic functionality")
    return True

# Initialize application
print("Initializing application...")
init_success = load_models() and load_data()

def translate_text(text, source_to_target='ar_to_en'):
    """Translate text between Arabic and English"""
    try:
        if source_to_target == 'ar_to_en':
            tokenizer = models['ar_to_en_tokenizer']
            model = models['ar_to_en_model']
        else:
            tokenizer = models['en_to_ar_tokenizer']
            model = models['en_to_ar_model']
            
        inputs = tokenizer(text, return_tensors="pt", truncation=True)
        outputs = model.generate(**inputs)
        return tokenizer.decode(outputs[0], skip_special_tokens=True)
    except Exception as e:
        print(f"Translation error: {e}")
        return text

def embed_query_text(query_text):
    embedding = models['embedding_model']
    query_embedding = embedding.encode([query_text])
    return query_embedding

def query_embeddings(query_embedding, embeddings_data=None, n_results=5):
    embeddings_data = load_embeddings()
    if not embeddings_data:
        print("No embeddings data available.")
        return []
    try:
        doc_ids = list(embeddings_data.keys())
        doc_embeddings = np.array(list(embeddings_data.values()))
        similarities = cosine_similarity(query_embedding, doc_embeddings).flatten()
        top_indices = similarities.argsort()[-n_results:][::-1]
        return [(doc_ids[i], similarities[i]) for i in top_indices]
    except Exception as e:
        print(f"Error in query_embeddings: {e}")
        return []

def query_recipes_embeddings(query_embedding, embeddings_data=None, n_results=5):
    embeddings_data = load_recipes_embeddings()
    if not embeddings_data:
        print("No embeddings data available.")
        return []
    try:
        doc_ids = list(embeddings_data.keys())
        doc_embeddings = np.array(list(embeddings_data.values()))
        similarities = cosine_similarity(query_embedding, doc_embeddings).flatten()
        top_indices = similarities.argsort()[-n_results:][::-1]
        return [(doc_ids[i], similarities[i]) for i in top_indices]
    except Exception as e:
        print(f"Error in query_embeddings: {e}")
        return []

def get_page_title(url):
    try:
        response = requests.get(url)
        if response.status_code == 200:
            soup = BeautifulSoup(response.text, 'html.parser')
            title = soup.find('title')
            return title.get_text() if title else "No title found"
        else:
            return None
    except requests.exceptions.RequestException:
        return None

def retrieve_document_texts(doc_ids, folder_path='downloaded_articles/downloaded_articles'):
    texts = []
    for doc_id in doc_ids:
        file_path = os.path.join(folder_path, doc_id)
        try:
            # Check if the file exists
            if not os.path.exists(file_path):
                print(f"Warning: Document file not found: {file_path}")
                texts.append("")
                continue
            # Read and parse the HTML file
            with open(file_path, 'r', encoding='utf-8') as file:
                soup = BeautifulSoup(file, 'html.parser')
                text = soup.get_text(separator=' ', strip=True)
                texts.append(text)
        except Exception as e:
            print(f"Error retrieving document {doc_id}: {e}")
            texts.append("")
    return texts

def retrieve_recipes_texts(doc_ids, zip_path='pdf kb.zip'):
    texts = []
    
    try:
        # Check if the .zip file exists
        if not os.path.exists(zip_path):
            print(f"Error: Zip file not found at '{zip_path}'")
            return ["" for _ in doc_ids]
        
        # Create a temporary directory to extract the .zip contents
        with tempfile.TemporaryDirectory() as temp_dir:
            with zipfile.ZipFile(zip_path, 'r') as zip_ref:
                zip_ref.extractall(temp_dir)  # Extract all files to the temp directory
            
            # Iterate through the document IDs
            for doc_id in doc_ids:
                # Construct the expected PDF file path
                pdf_path = os.path.join(temp_dir, f"{doc_id}.pdf")
                try:
                    # Check if the PDF file exists
                    if not os.path.exists(pdf_path):
                        print(f"Warning: PDF file not found: {pdf_path}")
                        texts.append("")
                        continue
                    
                    # Read and extract text from the PDF
                    with open(pdf_path, 'rb') as pdf_file:
                        reader = PdfReader(pdf_file)
                        pdf_text = ""
                        for page in reader.pages:
                            pdf_text += page.extract_text()
                        
                        # Add the extracted text to the result list
                        texts.append(pdf_text.strip())
                except Exception as e:
                    print(f"Error retrieving text from document {doc_id}: {e}")
                    texts.append("")
    
    except Exception as e:
        print(f"Error handling zip file: {e}")
        return ["" for _ in doc_ids]
    return texts

def rerank_documents(query, document_ids, document_texts, cross_encoder_model):
    try:
        # Prepare pairs for the cross-encoder
        pairs = [(query, doc) for doc in document_texts]
        # Get scores using the cross-encoder model
        scores = cross_encoder_model.predict(pairs)
        # Combine scores with document IDs and texts
        scored_documents = list(zip(scores, document_ids, document_texts))
        # Sort by scores in descending order
        scored_documents.sort(key=lambda x: x[0], reverse=True)
        # Print reranked results
        print("Reranked results:")
        for idx, (score, doc_id, doc) in enumerate(scored_documents):
            print(f"Rank {idx + 1} (Score: {score:.4f}, Document ID: {doc_id})")
        return scored_documents
    except Exception as e:
        print(f"Error reranking documents: {e}")
        return []

def extract_entities(text, ner_pipeline=None):
    try:
        # Use the provided pipeline or default to the model dictionary
        if ner_pipeline is None:
            ner_pipeline = models['ner_pipeline']
        # Perform NER using the pipeline
        ner_results = ner_pipeline(text)
        # Extract unique entities that start with "B-"
        entities = {result['word'] for result in ner_results if result['entity'].startswith("B-")}
        return list(entities)
    except Exception as e:
        print(f"Error extracting entities: {e}")
        return []

def match_entities(query_entities, sentence_entities):
    try:
        query_set, sentence_set = set(query_entities), set(sentence_entities)
        matches = query_set.intersection(sentence_set)
        return len(matches)
    except Exception as e:
        print(f"Error matching entities: {e}")
        return 0

def extract_relevant_portions(document_texts, query, max_portions=3, portion_size=1, min_query_words=1):
    relevant_portions = {}
    # Extract entities from the query
    query_entities = extract_entities(query)
    print(f"Extracted Query Entities: {query_entities}")
    for doc_id, doc_text in enumerate(document_texts):
        sentences = nltk.sent_tokenize(doc_text)  # Split document into sentences
        doc_relevant_portions = []
        # Extract entities from the entire document
        #ner_biobert = models['ner_pipeline']
        doc_entities = extract_entities(doc_text)
        print(f"Document {doc_id} Entities: {doc_entities}")
        for i, sentence in enumerate(sentences):
            # Extract entities from the sentence
            sentence_entities = extract_entities(sentence)
            # Compute relevance score
            relevance_score = match_entities(query_entities, sentence_entities)
            # Select sentences with at least `min_query_words` matching entities
            if relevance_score >= min_query_words:
                start_idx = max(0, i - portion_size // 2)
                end_idx = min(len(sentences), i + portion_size // 2 + 1)
                portion = " ".join(sentences[start_idx:end_idx])
                doc_relevant_portions.append(portion)
            if len(doc_relevant_portions) >= max_portions:
                break
        # Fallback: Include most entity-dense sentences if no relevant portions were found
        if not doc_relevant_portions and len(doc_entities) > 0:
            print(f"Fallback: Selecting sentences with most entities for Document {doc_id}")
            sorted_sentences = sorted(sentences, key=lambda s: len(extract_entities(s, ner_biobert)), reverse=True)
            for fallback_sentence in sorted_sentences[:max_portions]:
                doc_relevant_portions.append(fallback_sentence)
        # Add the extracted portions to the result dictionary
        relevant_portions[f"Document_{doc_id}"] = doc_relevant_portions
    return relevant_portions

def remove_duplicates(selected_parts):
    unique_sentences = set()
    unique_selected_parts = []
    for sentence in selected_parts:
        if sentence not in unique_sentences:
            unique_selected_parts.append(sentence)
            unique_sentences.add(sentence)
    return unique_selected_parts

def extract_entities(text):
    try:
        biobert_tokenizer = models['bio_tokenizer']
        biobert_model = models['bio_model']
        inputs = biobert_tokenizer(text, return_tensors="pt")
        outputs = biobert_model(**inputs)
        predictions = torch.argmax(outputs.logits, dim=2)

        tokens = biobert_tokenizer.convert_ids_to_tokens(inputs.input_ids[0])
        entities = [
            tokens[i] 
            for i in range(len(tokens)) 
            if predictions[0][i].item() != 0  # Assuming 0 is the label for non-entity
        ]
        return entities
    except Exception as e:
        print(f"Error extracting entities: {e}")
        return []

def enhance_passage_with_entities(passage, entities):
    return f"{passage}\n\nEntities: {', '.join(entities)}"

def create_prompt(question, passage):
    prompt = ("""
    As a medical expert, you are required to answer the following question based only on the provided passage. Do not include any information not present in the passage. Your response should directly reflect the content of the passage. Maintain accuracy and relevance to the provided information.

    Passage: {passage}

    Question: {question}

    Answer:
    """)
    return prompt.format(passage=passage, question=question)

def generate_answer(prompt, max_length=860, temperature=0.2):
    tokenizer_f = models['llm_tokenizer']
    model_f = models['llm_model']
    inputs = tokenizer_f(prompt, return_tensors="pt", truncation=True)
    # Start timing
    #start_time = time.time()
    # Generate the output
    output_ids = model_f.generate(
        inputs.input_ids,
        max_length=max_length,
        num_return_sequences=1,
        temperature=temperature,
        pad_token_id=tokenizer_f.eos_token_id
    )
    # End timing
    #end_time = time.time()
    # Calculate the duration
    #duration = end_time - start_time
    # Decode the answer
    answer = tokenizer_f.decode(output_ids[0], skip_special_tokens=True)
    # Extract keywords from the passage and answer
    passage_keywords = set(prompt.lower().split())  # Adjusted to check keywords in the full prompt
    answer_keywords = set(answer.lower().split())
    # Verify if the answer aligns with the passage
    if passage_keywords.intersection(answer_keywords):
        return answer  #, duration
    else:
        return "Sorry, I can't help with that." #, duration
  
def remove_answer_prefix(text):
    prefix = "Answer:"
    if prefix in text:
        return text.split(prefix, 1)[-1].strip()  # Split only once to avoid splitting at other occurrences of "Answer:"
    return text

def remove_incomplete_sentence(text):
    # Check if the text ends with a period
    if not text.endswith('.'):
        # Find the last period or the end of the string
        last_period_index = text.rfind('.')
        if last_period_index != -1:
            # Remove everything after the last period
            return text[:last_period_index + 1].strip()
    return text


language_code = 1
query_text = 'What are symptoms of heart attack ?'        
query_embedding = embed_query_text(query_text)  # Embed the query text
embeddings_data = load_embeddings ()
folder_path = 'downloaded_articles/downloaded_articles'
initial_results = query_embeddings(query_embedding, embeddings_data, n_results=5)
document_ids = [doc_id for doc_id, _ in initial_results]
print(document_ids)
document_ids = [doc_id for doc_id, _ in initial_results]
document_texts = retrieve_document_texts(document_ids, folder_path)

# Rerank the results using the CrossEncoder
cross_encoder = models['cross_encoder']
scores = cross_encoder.predict([(query_text, doc) for doc in document_texts])
scored_documents = list(zip(scores, document_ids, document_texts))
scored_documents.sort(key=lambda x: x[0], reverse=True)
print("Reranked results:")
for idx, (score, doc_id, doc) in enumerate(scored_documents):
    print(f"Rank {idx + 1} (Score: {score:.4f}, Document ID: {doc_id}")
relevant_portions = extract_relevant_portions(document_texts, query_text, max_portions=3, portion_size=1, min_query_words=1)

for doc_id, portions in relevant_portions.items():
    print(f"{doc_id}: {portions}")

flattened_relevant_portions = []
for doc_id, portions in relevant_portions.items():
    flattened_relevant_portions.extend(portions)

# Remove duplicate portions
unique_selected_parts = remove_duplicates(flattened_relevant_portions)

# Combine the unique parts into a single string of context
combined_parts = " ".join(unique_selected_parts)

# Construct context as a list: first the query, then the unique selected portions
context = [query_text] + unique_selected_parts

# Print the context (query + relevant portions)
print(context)
entities = extract_entities(query_text)
passage = enhance_passage_with_entities(combined_parts, entities)
# Generate answer with the enhanced passage
prompt = create_prompt(query_text, passage)
answer = generate_answer(prompt)
#print(f"\nTime taken to generate the answer: {generation_time:.2f} seconds")
answer_part = answer.split("Answer:")[-1].strip()
cleaned_answer = remove_answer_prefix(answer_part)
final_answer = remove_incomplete_sentence(cleaned_answer)

if language_code == 0:
    final_answer = translate_en_to_ar(final_answer)

if final_answer:
    print("Answer:")
    print(final_answer)
else:
    print("Sorry, I can't help with that.")

@app.get("/")
async def root():
    return {"message": "Welcome to the FastAPI application! Use the /health endpoint to check health, and /api/query for processing queries."}

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    status = {
        'status': 'healthy',
        'models_loaded': bool(models),
        'embeddings_loaded': bool(data.get('embeddings')),
        'documents_loaded': not data.get('df', pd.DataFrame()).empty
    }
    return status

@app.post("/api/chat")
async def chat_endpoint(chat_query: ChatQuery):
    try:
        query_text = chat_query.query
        language_code = chat_query.language_code
        query_embedding = embed_query_text(query_text)  # Embed the query text
        embeddings_data = load_embeddings ()
        folder_path = 'downloaded_articles/downloaded_articles'
        initial_results = query_embeddings(query_embedding, embeddings_data, n_results=5)
        document_ids = [doc_id for doc_id, _ in initial_results]
        document_texts = retrieve_document_texts(document_ids, folder_path)
        cross_encoder = models['cross_encoder']
        scores = cross_encoder.predict([(query_text, doc) for doc in document_texts])
        scored_documents = list(zip(scores, document_ids, document_texts))
        scored_documents.sort(key=lambda x: x[0], reverse=True)
        relevant_portions = extract_relevant_portions(document_texts, query_text, max_portions=3, portion_size=1, min_query_words=1)
        flattened_relevant_portions = []
        for doc_id, portions in relevant_portions.items():
            flattened_relevant_portions.extend(portions)
        unique_selected_parts = remove_duplicates(flattened_relevant_portions)
        combined_parts = " ".join(unique_selected_parts)
        context = [query_text] + unique_selected_parts
        entities = extract_entities(query_text)
        passage = enhance_passage_with_entities(combined_parts, entities)
        prompt = create_prompt(query_text, passage)
        answer = generate_answer(prompt)
        answer_part = answer.split("Answer:")[-1].strip()
        cleaned_answer = remove_answer_prefix(answer_part)
        final_answer = remove_incomplete_sentence(cleaned_answer)
        if language_code == 0:
            final_answer = translate_en_to_ar(final_answer)
        if final_answer:
            print("Answer:")
            print(final_answer)
        else:
            print("Sorry, I can't help with that.")
        return {
            "response": final_answer,
            "conversation_id": chat_query.conversation_id,
            "success": True
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/resources")
async def resources_endpoint(profile: MedicalProfile):
    try:
        # Build the query text
        query_text = profile.conditions + " " + profile.daily_symptoms

        # Generate the query embedding
        query_embedding = embed_query_text(query_text)
        if query_embedding is None:
            raise ValueError("Failed to generate query embedding.")

        # Load embeddings and retrieve initial results
        embeddings_data = load_embeddings()
        folder_path = 'downloaded_articles/downloaded_articles'
        initial_results = query_embeddings(query_embedding, embeddings_data, n_results=6)
        if not initial_results:
            raise ValueError("No relevant documents found.")

        # Extract document IDs
        document_ids = [doc_id for doc_id, _ in initial_results]

        # Load document metadata (URL mappings)
        file_path = 'finalcleaned_excel_file.xlsx'
        df = pd.read_excel(file_path)
        file_name_to_url = {f"article_{index}.html": url for index, url in enumerate(df['Unnamed: 0'])}

        # Map file names to original URLs
        resources = []
        for file_name in document_ids:
            original_url = file_name_to_url.get(file_name, None)
            if original_url:
                title = get_page_title(original_url) or "Unknown Title"
                resources.append({"file_name": file_name, "title": title, "url": original_url})
            else:
                resources.append({"file_name": file_name, "title": "Unknown", "url": None})

        # Retrieve document texts
        document_texts = retrieve_document_texts(document_ids, folder_path)
        if not document_texts:
            raise ValueError("Failed to retrieve document texts.")

        # Perform re-ranking
        cross_encoder = models['cross_encoder']
        scores = cross_encoder.predict([(query_text, doc) for doc in document_texts])
        scores = [float(score) for score in scores]  # Convert to native Python float

        # Combine scores with resources
        for i, resource in enumerate(resources):
            resource["score"] = scores[i] if i < len(scores) else 0.0

        # Sort resources by score
        resources.sort(key=lambda x: x["score"], reverse=True)

        # Limit response to top 5 resources
        return {"resources": resources[:5], "success": True}

    except ValueError as ve:
        # Handle expected errors
        raise HTTPException(status_code=400, detail=str(ve))
    except Exception as e:
        # Handle unexpected errors
        print(f"Unexpected error: {e}")
        raise HTTPException(status_code=500, detail="An unexpected error occurred.")

 

@app.post("/api/recipes")
async def recipes_endpoint(profile: MedicalProfile):
    try:
        # Build the query text for recipes
        recipe_query = (
            f"Recipes and meals suitable for someone with: "
            f"{profile.conditions} and experiencing {profile.daily_symptoms}"
        )
        query_text = recipe_query

        # Generate the query embedding
        query_embedding = embed_query_text(query_text)
        if query_embedding is None:
            raise ValueError("Failed to generate query embedding.")

        # Load embeddings and retrieve initial results
        embeddings_data = load_recipes_embeddings()
        folder_path = 'pdf kb.zip'
        initial_results = query_recipes_embeddings(query_embedding, embeddings_data, n_results=10)
        if not initial_results:
            raise ValueError("No relevant recipes found.")

        # Extract document IDs
        document_ids = [doc_id for doc_id, _ in initial_results]

        # Retrieve document texts
        document_texts = retrieve_recipes_texts(document_ids, folder_path)
        if not document_texts:
            raise ValueError("Failed to retrieve document texts.")

        # Perform re-ranking with cross-encoder
        cross_encoder = models['cross_encoder']
        scores = cross_encoder.predict([(query_text, doc) for doc in document_texts])
        scores = [float(score) for score in scores]  # Convert scores to native floats

        # Combine document data
        scored_documents = list(zip(scores, document_ids, document_texts))
        scored_documents.sort(key=lambda x: x[0], reverse=True)  # Sort by score

        # Load recipe metadata from DataFrame
        file_path = 'finalcleaned_excel_file.xlsx'
        df = pd.read_excel(file_path)

        # Prepare the final recipes list
        recipes = []
        for score, doc_id, text in scored_documents:
            # Retrieve metadata for the document
            doc_info = df[df['Unnamed: 0'] == doc_id]
            if not doc_info.empty:
                title = doc_info.iloc[0]['title'] if 'title' in doc_info.columns else "Unknown Title"
                if 'recipe' in text.lower() or 'meal' in text.lower():
                    recipes.append({
                        "id": doc_id,
                        "title": title,
                        "content_preview": text[:200],  # First 200 characters of text
                        "score": score,
                    })

        # Limit the response to top 5 recipes
        return {"recipes": recipes[:10], "success": True}

    except ValueError as ve:
        # Handle expected errors
        raise HTTPException(status_code=400, detail=str(ve))
    except Exception as e:
        # Handle unexpected errors
        print(f"Unexpected error: {e}")
        raise HTTPException(status_code=500, detail="An unexpected error occurred.")

if not init_success:
    print("Warning: Application initialized with partial functionality")

# For running locally
if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)