from fastapi import FastAPI, HTTPException, Depends, Request, status, Form, WebSocket, WebSocketDisconnect
from fastapi.middleware.cors import CORSMiddleware
from fastapi.security import OAuth2PasswordRequestForm
from jose import JWTError, jwt
from passlib.context import CryptContext
from datetime import datetime, timedelta
from pymongo import MongoClient
from bson import ObjectId
from fastapi.responses import JSONResponse
from dotenv import load_dotenv
import os
from starlette.websockets import WebSocketState
from jose import JWTError
import httpx 

load_dotenv()

class ConnectionManager:
    def __init__(self):
        self.active_connections: list[WebSocket] = []

    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)

    def disconnect(self, websocket: WebSocket):
        self.active_connections.remove(websocket)

    async def broadcast(self, message: dict):
        for connection in self.active_connections:
            try:
                await connection.send_json(message)
            except Exception:
                self.active_connections.remove(connection)

manager = ConnectionManager()

# Constants
SECRET_KEY = os.environ.get("SECRET_KEY")
ALGORITHM = os.environ.get("ALGORITHM")
ACCESS_TOKEN_EXPIRE_MINUTES = 60

# Admin credentials
fake_admin_db = {
    "admin": {
        "username": os.environ.get("ADMIN_USERNAME"),
        "hashed_password": os.environ.get("ADMIN_PASSWORD")
    }
}

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
client = MongoClient(os.environ.get("MONGODB_URI"))
db = client["thehexatechdb"]
collection = db["quotationsdb"]

app = FastAPI()

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

# Auth Utilities
def verify_password(plain, hashed):
    return pwd_context.verify(plain, hashed)

def get_password_hash(password):
    return pwd_context.hash(password)

def authenticate_user(username: str, password: str):
    user = fake_admin_db.get(username)
    if not user or not verify_password(password, user["hashed_password"]):
        return False
    return {"username": username}

def create_access_token(data: dict, expires_delta=None):
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)

def get_current_user(token: str = Depends(OAuth2PasswordRequestForm)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Invalid credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token.password, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
        return {"username": username}
    except JWTError:
        raise credentials_exception

# Routes
@app.post("/api/submit")
async def submit_query(name: str = Form(...), email: str = Form(...), message: str = Form(...)):
    query = {"name": name, "email": email, "message": message, "created_at": datetime.utcnow()}
    result = collection.insert_one(query)

    DISCORD_WEBHOOK_URL = os.environ.get("DISCORD_WEBHOOK_URL")  # Add to .env

    async def send_discord_notification(data: dict):
        content = (
            f"📩 **New Quotation Received**\n"
            f"👤 **Name:** {data['name']}\n"
            f"📧 **Email:** {data['email']}\n"
            f"💬 **Message:** {data['message']}\n"
            f"🕒 **Time:** {datetime.utcnow().strftime('%Y-%m-%d %H:%M UTC')}"
        )
        async with httpx.AsyncClient() as client:
            await client.post(DISCORD_WEBHOOK_URL, json={"content": content})

    query["_id"] = str(result.inserted_id)

    total_count = collection.count_documents({})

    try:
        await send_discord_notification(query)
    except Exception as e:
        print("[Discord Notification Failed]", e)

    await manager.broadcast({
        "event": "new_quote",
        "data": {
            "name": name,
            "email": email,
            "message": message,
            "total_count": total_count
        }
    })
    return JSONResponse(content={"id": query["_id"], "notify": True})


@app.post("/api/login")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    user = authenticate_user(form_data.username, form_data.password)
    if not user:
        raise HTTPException(status_code=401, detail="Invalid credentials")
    token = create_access_token({"sub": user["username"], "role": "admin"})
    return {"access_token": token, "token_type": "bearer"}

@app.get("/api/queries")
async def get_queries(token: str):
    try:
        jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        queries = list(collection.find())
        for q in queries:
            q["_id"] = str(q["_id"])
        return queries
    except JWTError:
        raise HTTPException(status_code=401, detail="Invalid token")

@app.delete("/api/queries/{query_id}")
async def delete_query(query_id: str, token: str):
    try:
        jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        result = collection.delete_one({"_id": ObjectId(query_id)})
        return {"deleted": result.deleted_count == 1}
    except JWTError:
        raise HTTPException(status_code=401, detail="Invalid token")


@app.websocket("/ws/notifications")
async def websocket_endpoint(websocket: WebSocket):
    token = websocket.query_params.get("token")
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username = payload.get("sub")
        role = payload.get("role")
        if not username or role != "admin":
            await websocket.close(code=1008)
            return
    except JWTError:
        await websocket.close(code=1008)
        return

    await manager.connect(websocket)
    print(f"[WS CONNECT] {username} (admin) connected at {datetime.utcnow()} from {websocket.client.host}")

    try:
        while True:
            await websocket.receive_text()
    except WebSocketDisconnect:
        print(f"[WS DISCONNECT] {username} disconnected at {datetime.utcnow()}")
        manager.disconnect(websocket)