from typing import Any, List
from fastapi import APIRouter, Body, Depends, HTTPException
from fastapi.encoders import jsonable_encoder
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.future import select

from app.api import deps
from app.core import security
from app.db.session import get_db
from app.models.user import User
from app.schemas.user import User as UserSchema, UserCreate, UserUpdate

router = APIRouter()

@router.get("/", response_model=List[UserSchema])
async def read_users(
    db: AsyncSession = Depends(get_db),
    skip: int = 0,
    limit: int = 100,
    current_user: User = Depends(deps.get_current_user),
) -> Any:
    """
    Retrieve users.
    """
    result = await db.execute(select(User).offset(skip).limit(limit))
    users = result.scalars().all()
    return users

@router.post("/", response_model=UserSchema)
async def create_user(
    *,
    db: AsyncSession = Depends(get_db),
    user_in: UserCreate,
) -> Any:
    """
    Create new user.
    """
    result = await db.execute(select(User).where(User.email == user_in.email))
    user = result.scalars().first()
    if user:
        raise HTTPException(
            status_code=400,
            detail="The user with this username already exists in the system.",
        )
    
    db_user = User(
        email=user_in.email,
        hashed_password=security.get_password_hash(user_in.password),
        full_name=user_in.full_name,
        is_active=user_in.is_active,
        is_superuser=user_in.is_superuser,
    )
    db.add(db_user)
    await db.commit()
    await db.refresh(db_user)
    return db_user

@router.get("/me", response_model=UserSchema)
async def read_user_me(
    current_user: User = Depends(deps.get_current_user),
) -> Any:
    """
    Get current user.
    """
    return current_user