from fastapi import FastAPI, Request, HTTPException,Depends,File, UploadFile, Response
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from huggingface_hub import InferenceClient
import secrets
from typing import Optional
from bson.objectid import ObjectId  
from datetime import datetime, timedelta  
from fastapi import Request
import requests
import numpy as np
import argparse
import os
from pymongo import MongoClient
from datetime import datetime  
from passlib.hash import bcrypt  
import PyPDF2
from io import BytesIO
import uuid

SECRET_KEY = secrets.token_hex(32)  

HOST = os.environ.get("API_URL", "0.0.0.0")
PORT = os.environ.get("PORT", 7860)
parser = argparse.ArgumentParser()
parser.add_argument("--host", default=HOST)
parser.add_argument("--port", type=int, default=PORT)
parser.add_argument("--reload", action="store_true", default=True)
parser.add_argument("--ssl_certfile")
parser.add_argument("--ssl_keyfile")
args = parser.parse_args()

# Configuration MongoDB
mongo_uri = os.environ.get("MONGODB_URI", "mongodb+srv://giffardaxel95:TQ5bfvWFqRhkHGVi@chatbotmed.qfn2kdn.mongodb.net/")
db_name = os.environ.get("DB_NAME", "chatmed_schizo")
mongo_client = MongoClient(mongo_uri)
db = mongo_client[db_name]



app = FastAPI()
app.add_middleware(
    CORSMiddleware,

    allow_origins=[
        "https://axl95-medically.hf.space",  
        "https://huggingface.co", 
        "http://localhost:3000",
        "http://localhost:7860",
        "http://0.0.0.0:7860"
    ],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


async def get_admin_user(request: Request):
    user = await get_current_user(request)
    if user["role"] != "Administrateur":
        raise HTTPException(status_code=403, detail="Accès interdit: Droits d'administrateur requis")
    return user


# Initialiser le modèle d'embedding (à faire une seule fois au démarrage)
try:
    embedder = SentenceTransformer('all-MiniLM-L6-v2')
except Exception as e:
    print(f"Erreur lors du chargement du modèle d'embedding: {str(e)}")
    embedder = None
@app.post("/api/admin/knowledge/upload")
async def upload_pdf(
    file: UploadFile = File(...),
    title: str = None,
    tags: str = None,
    current_user: dict = Depends(get_admin_user)
):
    try:
        # Vérifier que le fichier est un PDF
        if not file.filename.endswith('.pdf'):
            raise HTTPException(status_code=400, detail="Le fichier doit être un PDF")
        
        # Lire le contenu du PDF
        contents = await file.read()
        pdf_file = BytesIO(contents)
        
        # Extraire le texte du PDF
        pdf_reader = PyPDF2.PdfReader(pdf_file)
        text_content = ""
        for page_num in range(len(pdf_reader.pages)):
            text_content += pdf_reader.pages[page_num].extract_text() + "\n"
        
        # Générer un embedding pour l'ensemble du texte si le modèle est disponible
        embedding = None
        if embedder:
            try:
                # Limiter la taille du texte si nécessaire
                max_length = 5000
                truncated_text = text_content[:max_length]
                embedding = embedder.encode(truncated_text).tolist()
            except Exception as e:
                print(f"Erreur lors de la génération de l'embedding: {str(e)}")
        
        # Générer un identifiant unique pour le document
        doc_id = ObjectId()
        
        # Enregistrer le fichier original 
        pdf_path = f"files/{str(doc_id)}.pdf"
        os.makedirs("files", exist_ok=True)
        with open(pdf_path, "wb") as f:
            pdf_file.seek(0)
            f.write(contents)
        
        # Créer un objet document dans MongoDB
        document = {
            "_id": doc_id,
            "text": text_content,
            "embedding": embedding,
            "title": title or file.filename,
            "tags": tags.split(",") if tags else [],
            "uploaded_by": str(current_user["_id"]),
            "upload_date": datetime.utcnow()
        }
        
        print(f"Tentative d'insertion du document avec ID: {doc_id}")
        result = db.connaissances.insert_one(document)
        print(f"Document inséré avec ID: {result.inserted_id}")
        
        # Vérification de l'insertion
        verification = db.connaissances.find_one({"_id": doc_id})
        if verification:
            print(f"Document vérifié et trouvé dans la base de données")
            return {"success": True, "document_id": str(doc_id)}
        else:
            print(f"ERREUR: Document non trouvé après insertion")
            return {"success": False, "error": "Document non trouvé après insertion"}
        
    except Exception as e:
        import traceback
        print(f"Erreur lors de l'upload du PDF: {traceback.format_exc()}")
        raise HTTPException(status_code=500, detail=f"Erreur: {str(e)}")

@app.get("/api/admin/knowledge")
async def list_documents(current_user: dict = Depends(get_admin_user)):
    try:
        # Récupérer les documents triés par date (plus récents en premier)
        documents = list(db.connaissances.find().sort("upload_date", -1))
        
        # Convertir les types non sérialisables (ObjectId, datetime, etc.)
        result = []
        for doc in documents:
            doc_safe = {
                "id": str(doc["_id"]),
                "title": doc.get("title", "Sans titre"),
                "tags": doc.get("tags", []),
                "date": doc.get("upload_date").isoformat() if "upload_date" in doc else None,
                "text_preview": doc.get("text", "")[:100] + "..." if len(doc.get("text", "")) > 100 else doc.get("text", "")
            }
            result.append(doc_safe)
        
        return {"documents": result}
    except Exception as e:
        print(f"Erreur lors de la liste des documents: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Erreur: {str(e)}")



@app.delete("/api/admin/knowledge/{document_id}")
async def delete_document(document_id: str, current_user: dict = Depends(get_admin_user)):
    try:
        # Convertir l'ID string en ObjectId
        try:
            doc_id = ObjectId(document_id)
        except Exception:
            raise HTTPException(status_code=400, detail="ID de document invalide")
        
        # Vérifier si le document existe
        document = db.connaissances.find_one({"_id": doc_id})
        if not document:
            raise HTTPException(status_code=404, detail="Document non trouvé")
        
        # Supprimer le document de la base de données
        result = db.connaissances.delete_one({"_id": doc_id})
        
        if result.deleted_count == 0:
            raise HTTPException(status_code=500, detail="Échec de la suppression du document")
        
        # Supprimer le fichier PDF associé s'il existe
        pdf_path = f"files/{document_id}.pdf"
        if os.path.exists(pdf_path):
            try:
                os.remove(pdf_path)
                print(f"Fichier supprimé: {pdf_path}")
            except Exception as e:
                print(f"Erreur lors de la suppression du fichier: {str(e)}")
                # On continue même si la suppression du fichier échoue
        
        return {"success": True, "message": "Document supprimé avec succès"}
        
    except HTTPException as he:
        raise he
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Erreur lors de la suppression: {str(e)}")


@app.post("/api/login")
async def login(request: Request, response: Response):
    try:
        data = await request.json()
        email = data.get("email")
        password = data.get("password")
        
        user = db.users.find_one({"email": email})
        if not user or not bcrypt.verify(password, user["password"]):
            raise HTTPException(status_code=401, detail="Email ou mot de passe incorrect")
        
        session_id = secrets.token_hex(16)
        user_id = str(user["_id"])
        username = f"{user['prenom']} {user['nom']}"
        
        # Stocker la session en base de données
        db.sessions.insert_one({
            "session_id": session_id,
            "user_id": user_id,
            "created_at": datetime.utcnow(),
            "expires_at": datetime.utcnow() + timedelta(days=7)
        })
        
        # Cookie configuré pour fonctionner sur HF Spaces
        response.set_cookie(
            key="session_id", 
            value=session_id, 
            httponly=False,  
            max_age=7*24*60*60,  
            samesite="none", 
            secure=True,      
            path="/"         
        )
        
        # Log pour débogage
        print(f"Session créée: {session_id} pour l'utilisateur {user_id}")
        
        return {
            "success": True, 
            "username": username, 
            "user_id": user_id,
            "session_id": session_id,
            "role": user.get("role", "user")  

        }
    
    except Exception as e:
        print(f"Erreur login: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))


async def get_current_user(request: Request):
    session_id = request.cookies.get("session_id")
    print(f"Cookie de session reçu: {session_id[:5] if session_id else 'None'}")
    
    if not session_id:
        auth_header = request.headers.get("Authorization")
        if auth_header and auth_header.startswith("Bearer "):
            session_id = auth_header.replace("Bearer ", "")
            print(f"Session d'autorisation reçue: {session_id[:5]}...")
    
    if not session_id:
        session_id = request.query_params.get("session_id")
        if session_id:
            print(f"Session des paramètres de requête: {session_id[:5]}...")
    
    if not session_id:
        raise HTTPException(status_code=401, detail="Non authentifié - Aucune session trouvée")
    
    session = db.sessions.find_one({
        "session_id": session_id,
        "expires_at": {"$gt": datetime.utcnow()}
    })
    
    if not session:
        raise HTTPException(status_code=401, detail="Session expirée ou invalide")
    
    user = db.users.find_one({"_id": ObjectId(session["user_id"])})
    if not user:
        raise HTTPException(status_code=401, detail="Utilisateur non trouvé")
    
    return user

# Endpoint pour déconnexion
@app.post("/api/logout")
async def logout(request: Request, response: Response):
    session_id = request.cookies.get("session_id")
    if session_id:
        db.sessions.delete_one({"session_id": session_id})
    
    response.delete_cookie(key="session_id")
    return {"success": True}
@app.post("/api/register")
async def register(request: Request):
    try:
        data = await request.json()
        
        required_fields = ["prenom", "nom", "email", "password"]
        for field in required_fields:
            if not data.get(field):
                raise HTTPException(status_code=400, detail=f"Le champ {field} est requis")
        
        existing_user = db.users.find_one({"email": data["email"]})
        if existing_user:
            raise HTTPException(status_code=409, detail="Cet email est déjà utilisé")
        
        hashed_password = bcrypt.hash(data["password"])
        
        user = {
            "prenom": data["prenom"],
            "nom": data["nom"],
            "email": data["email"],
            "password": hashed_password,
            "createdAt": datetime.utcnow(),
            "role": data.get("role", "user"),  

        }
        
        result = db.users.insert_one(user)
        
        return {"message": "Utilisateur créé avec succès", "userId": str(result.inserted_id)}
    
    except HTTPException as he:
        raise he
    
    except Exception as e:
        import traceback
        print(f"Erreur lors de l'inscription: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")
@app.post("/api/embed")
async def embed(request: Request):
    data = await request.json()
    texts = data.get("texts", [])
    
    try:
        
        dummy_embedding = [[0.1, 0.2, 0.3] for _ in range(len(texts))]
        
        return {"embeddings": dummy_embedding}
    except Exception as e:
        return {"error": str(e)}

@app.get("/invert")
async def invert(text: str):
    return {
        "original": text,
        "inverted": text[::-1],
    }

HF_TOKEN = os.getenv('REACT_APP_HF_TOKEN')
if not HF_TOKEN:
    raise RuntimeError("Le token Hugging Face (HF_TOKEN) n'est pas défini dans les variables d'environnement.")

hf_client = InferenceClient(token=HF_TOKEN)

@app.post("/api/chat")
async def chat(request: Request):
    data = await request.json()
    user_message = data.get("message", "").strip()
    if not user_message:
        raise HTTPException(status_code=400, detail="Le champ 'message' est requis.")

    try:
        response = hf_client.text_generation(
            model="mistralai/Mistral-7B-Instruct-v0.3",
            prompt=f"<s>[INST] Tu es un assistant médical spécialisé en schizophrénie. Réponds à cette question: {user_message} [/INST]",
            max_new_tokens=512,
            temperature=0.7,
            provider="novita" 
        )
        
        return {"response": response}
    
    except Exception as e:
        import traceback
        print(f"Erreur détaillée: {traceback.format_exc()}")
        raise HTTPException(status_code=502, detail=f"Erreur d'inférence HF : {str(e)}")



@app.get("/data")
async def get_data():
    data = {"data": np.random.rand(100).tolist()}
    return JSONResponse(data)

@app.get("/api/conversations")
async def get_conversations(current_user: dict = Depends(get_current_user)):
    try:
        user_id = str(current_user["_id"])
        conversations = list(db.conversations.find(
            {"user_id": user_id},
            {"_id": 1, "title": 1, "date": 1, "time": 1, "last_message": 1, "created_at": 1}
        ).sort("created_at", -1))
        
        for conv in conversations:
            conv["_id"] = str(conv["_id"])
        
        return {"conversations": conversations}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")

@app.post("/api/conversations")
async def create_conversation(request: Request, current_user: dict = Depends(get_current_user)):
    try:
        data = await request.json()
        user_id = str(current_user["_id"])
        
        conversation = {
            "user_id": user_id,
            "title": data.get("title", "Nouvelle conversation"),
            "date": data.get("date"),
            "time": data.get("time"),
            "last_message": data.get("message", ""),
            "created_at": datetime.utcnow()
        }
        
        result = db.conversations.insert_one(conversation)
        
        return {"conversation_id": str(result.inserted_id)}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")

@app.post("/api/conversations/{conversation_id}/messages")
async def add_message(conversation_id: str, request: Request, current_user: dict = Depends(get_current_user)):
    try:
        data = await request.json()
        user_id = str(current_user["_id"])
        
        print(f"Ajout message: conversation_id={conversation_id}, sender={data.get('sender')}, text={data.get('text')[:20]}...")
        
        conversation = db.conversations.find_one({
            "_id": ObjectId(conversation_id),
            "user_id": user_id
        })
        
        if not conversation:
            raise HTTPException(status_code=404, detail="Conversation non trouvée")
        
        message = {
            "conversation_id": conversation_id,
            "user_id": user_id,
            "sender": data.get("sender", "user"),
            "text": data.get("text", ""),
            "timestamp": datetime.utcnow()
        }
        
        db.messages.insert_one(message)
        
        db.conversations.update_one(
            {"_id": ObjectId(conversation_id)},
            {"$set": {"last_message": data.get("text", ""), "updated_at": datetime.utcnow()}}
        )
        
        return {"success": True}
    except Exception as e:
        print(f"Erreur lors de l'ajout d'un message: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")

@app.get("/api/conversations/{conversation_id}/messages")
async def get_messages(conversation_id: str, current_user: dict = Depends(get_current_user)):
    try:
        user_id = str(current_user["_id"])
        
        conversation = db.conversations.find_one({
            "_id": ObjectId(conversation_id),
            "user_id": user_id
        })
        
        if not conversation:
            raise HTTPException(status_code=404, detail="Conversation non trouvée")
        
        messages = list(db.messages.find(
            {"conversation_id": conversation_id}
        ).sort("timestamp", 1)) 
        
        for msg in messages:
            msg["_id"] = str(msg["_id"])
            if "timestamp" in msg:
                msg["timestamp"] = msg["timestamp"].isoformat()
        
        return {"messages": messages}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")

@app.delete("/api/conversations/{conversation_id}")
async def delete_conversation(conversation_id: str, current_user: dict = Depends(get_current_user)):
    try:
        user_id = str(current_user["_id"])
        
        result = db.conversations.delete_one({
            "_id": ObjectId(conversation_id),
            "user_id": user_id
        })
        
        if result.deleted_count == 0:
            raise HTTPException(status_code=404, detail="Conversation non trouvée")
        
        db.messages.delete_many({"conversation_id": conversation_id})
        
        return {"success": True}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Erreur serveur: {str(e)}")

app.mount("/", StaticFiles(directory="static", html=True), name="static")

if __name__ == "__main__":
    import uvicorn

    print(args)
    uvicorn.run(
        "app:app",
        host=args.host,
        port=args.port,
        reload=args.reload,
        ssl_certfile=args.ssl_certfile,
        ssl_keyfile=args.ssl_keyfile,
    )