from __future__ import annotations

from typing import Any, List

from fastapi import APIRouter, Body, Depends, HTTPException, status
from fastapi.encoders import jsonable_encoder
from pydantic import EmailStr
from sqlalchemy.orm import Session

from app import models, schemas
from app.api import deps
from app.db.session import get_db
from app.services.user import user as user_service

router = APIRouter()


@router.get("/", response_model=List[schemas.User])
def read_users(
    db: Session = Depends(get_db),
    skip: int = 0,
    limit: int = 100,
    current_user: models.User = Depends(deps.get_current_active_superuser),
) -> Any:
    """
    Retrieve users. Only for superusers.
    """
    users = user_service.get_multi(db, skip=skip, limit=limit)
    return users


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


@router.put("/me", response_model=schemas.User)
def update_user_me(
    *,
    db: Session = Depends(get_db),
    full_name: str = Body(None),
    email: EmailStr = Body(None),
    password: str = Body(None),
    current_user: models.User = Depends(deps.get_current_active_user),
) -> Any:
    """
    Update own user.
    """
    current_user_data = jsonable_encoder(current_user)
    user_in = schemas.UserUpdate(**current_user_data)

    if full_name is not None:
        user_in.full_name = full_name
    if email is not None:
        # Check if email is already taken
        if email != current_user.email:
            user = user_service.get_by_email(db, email=email)
            if user:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="Email already registered",
                )
        user_in.email = email
    if password is not None:
        user_in.password = password

    user = user_service.update(db, db_obj=current_user, obj_in=user_in)
    return user


@router.get("/{user_id}", response_model=schemas.User)
def read_user_by_id(
    user_id: int,
    current_user: models.User = Depends(deps.get_current_active_user),
    db: Session = Depends(get_db),
) -> Any:
    """
    Get a specific user by id.
    """
    user = user_service.get(db, id=user_id)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )

    # Regular users can only get their own info
    if user.id != current_user.id and not current_user.is_superuser:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Not enough permissions",
        )
    return user


@router.put("/{user_id}", response_model=schemas.User)
def update_user(
    *,
    db: Session = Depends(get_db),
    user_id: int,
    user_in: schemas.UserUpdate,
    current_user: models.User = Depends(deps.get_current_active_superuser),
) -> Any:
    """
    Update a user. Only for superusers.
    """
    user = user_service.get(db, id=user_id)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )

    # Check if email is already taken by another user
    if user_in.email is not None and user_in.email != user.email:
        existing_user = user_service.get_by_email(db, email=user_in.email)
        if existing_user and existing_user.id != user_id:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Email already registered",
            )

    user = user_service.update(db, db_obj=user, obj_in=user_in)
    return user