from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from datetime import timedelta
import logging

import sys
import os
# Add the backend directory to the path to allow absolute imports
sys.path.append(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))

from database import get_db
from models.user import User, UserCreate, UserResponse, UserUpdate
from utils.hash import hash_password, verify_password
from utils.token import create_access_token
from api.schemas import ChatbotQueryResponse
from middleware.auth import get_current_user

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/auth", tags=["auth"])

@router.post("/signup", response_model=UserResponse)
async def signup_user(
    user_data: UserCreate,
    db: Session = Depends(get_db)
):
    """
    Register a new user account
    """
    # Check if user with email already exists
    existing_user = db.query(User).filter(User.email == user_data.email).first()
    if existing_user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Email already registered"
        )

    # Create new user
    hashed_password = hash_password(user_data.password)
    new_user = User(
        email=user_data.email,
        password_hash=hashed_password,
        first_name=user_data.first_name,
        last_name=user_data.last_name
    )

    # Add to database
    db.add(new_user)
    db.commit()
    db.refresh(new_user)

    logger.info(f"New user registered: {new_user.email}")

    # Create and return access token
    access_token_expires = timedelta(minutes=30)
    access_token = create_access_token(
        data={"user_id": new_user.id}, expires_delta=access_token_expires
    )

    # Return user data and token
    return UserResponse(
        id=new_user.id,
        email=new_user.email,
        first_name=new_user.first_name,
        last_name=new_user.last_name,
        is_active=new_user.is_active,
        created_at=new_user.created_at.isoformat()
    )

@router.post("/register", response_model=UserResponse)
async def register_user(
    user_data: UserCreate,
    db: Session = Depends(get_db)
):
    """
    Register a new user account (duplicate endpoint for compatibility)
    """
    # Check if user with email already exists
    existing_user = db.query(User).filter(User.email == user_data.email).first()
    if existing_user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Email already registered"
        )

    # Create new user
    hashed_password = hash_password(user_data.password)
    new_user = User(
        email=user_data.email,
        password_hash=hashed_password,
        first_name=user_data.first_name,
        last_name=user_data.last_name
    )

    # Add to database
    db.add(new_user)
    db.commit()
    db.refresh(new_user)

    logger.info(f"New user registered: {new_user.email}")

    # Create and return access token
    access_token_expires = timedelta(minutes=30)
    access_token = create_access_token(
        data={"user_id": new_user.id}, expires_delta=access_token_expires
    )

    # Return user data and token
    return UserResponse(
        id=new_user.id,
        email=new_user.email,
        first_name=new_user.first_name,
        last_name=new_user.last_name,
        is_active=new_user.is_active,
        created_at=new_user.created_at.isoformat()
    )

@router.post("/login")
async def login_user(
    user_data: UserCreate,  # Using the same schema for login (email, password)
    db: Session = Depends(get_db)
):
    """
    Authenticate user and return JWT token
    """
    # Find user by email
    user = db.query(User).filter(User.email == user_data.email).first()

    if not user or not verify_password(user_data.password, user.password_hash):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )

    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Inactive account",
            headers={"WWW-Authenticate": "Bearer"},
        )

    # Create and return access token
    access_token_expires = timedelta(minutes=30)
    access_token = create_access_token(
        data={"user_id": user.id}, expires_delta=access_token_expires
    )

    logger.info(f"User logged in: {user.email}")

    return {
        "access_token": access_token,
        "token_type": "bearer",
        "user": {
            "id": user.id,
            "email": user.email,
            "first_name": user.first_name
        }
    }

@router.post("/logout")
async def logout_user():
    """
    Revoke the current user's JWT token
    """
    # In a real implementation, this would invalidate the token
    # For now, we'll just return a success message
    return {"message": "Successfully logged out"}

@router.get("/profile", response_model=UserResponse)
async def get_profile(
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    Get current user profile information
    """
    return UserResponse(
        id=current_user.id,
        email=current_user.email,
        first_name=current_user.first_name,
        last_name=current_user.last_name,
        is_active=current_user.is_active,
        created_at=current_user.created_at.isoformat()
    )

@router.get("/me", response_model=UserResponse)
async def get_current_user_info(
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    Get authenticated user details
    """
    return UserResponse(
        id=current_user.id,
        email=current_user.email,
        first_name=current_user.first_name,
        last_name=current_user.last_name,
        is_active=current_user.is_active,
        created_at=current_user.created_at.isoformat()
    )

@router.put("/profile", response_model=UserResponse)
async def update_profile(
    user_update: UserUpdate,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """
    Update user profile information
    """
    # Update user fields if they are provided
    if user_update.first_name is not None:
        current_user.first_name = user_update.first_name
    if user_update.last_name is not None:
        current_user.last_name = user_update.last_name

    # Commit changes to database
    db.commit()
    db.refresh(current_user)

    logger.info(f"User profile updated: {current_user.email}")

    return UserResponse(
        id=current_user.id,
        email=current_user.email,
        first_name=current_user.first_name,
        last_name=current_user.last_name,
        is_active=current_user.is_active,
        created_at=current_user.created_at.isoformat()
    )