from typing import Any, List

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

from app.core.deps import get_current_active_superuser, get_current_user, get_db
from app.core.security import get_password_hash
from app.models.user import User
from app.schemas.user import User as UserSchema
from app.schemas.user import UserCreate, UserUpdate

router = APIRouter()


@router.get("/", response_model=List[UserSchema])
def read_users(
    db: Session = Depends(get_db),
    skip: int = 0,
    limit: int = 100,
    current_user: User = Depends(get_current_active_superuser),
) -> Any:
    """
    Retrieve all users (superuser only).
    """
    users = db.query(User).offset(skip).limit(limit).all()
    return users


@router.post("/", response_model=UserSchema)
def create_user(
    *,
    db: Session = Depends(get_db),
    user_in: UserCreate,
) -> Any:
    """
    Create a new user.
    """
    # Check if user with same email exists
    user = db.query(User).filter(User.email == user_in.email).first()
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this email already exists.",
        )

    # Check if user with same username exists
    user = db.query(User).filter(User.username == user_in.username).first()
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this username already exists.",
        )

    # Create user object
    user_data = user_in.model_dump(exclude={"password"})
    user = User(
        **user_data,
        hashed_password=get_password_hash(user_in.password),
    )

    # Save to database
    db.add(user)
    db.commit()
    db.refresh(user)

    return user


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


@router.put("/me", response_model=UserSchema)
def update_user_me(
    *,
    db: Session = Depends(get_db),
    user_in: UserUpdate,
    current_user: User = Depends(get_current_user),
) -> Any:
    """
    Update current user.
    """
    # Convert model to dict
    user_data = jsonable_encoder(current_user)

    # Update with new data
    update_data = user_in.model_dump(exclude_unset=True)

    # If password in update data, hash it
    if "password" in update_data and update_data["password"]:
        update_data["hashed_password"] = get_password_hash(update_data.pop("password"))

    # Update user object
    for field in user_data:
        if field in update_data:
            setattr(current_user, field, update_data[field])

    # Save to database
    db.add(current_user)
    db.commit()
    db.refresh(current_user)

    return current_user


@router.get("/{user_id}", response_model=UserSchema)
def read_user_by_id(
    user_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
) -> Any:
    """
    Get a specific user by id.
    """
    user = db.query(User).filter(User.id == user_id).first()

    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )

    # Only superusers can access other users' data
    if user.id != current_user.id and not current_user.is_superuser:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="You don't have permission to access this user",
        )

    return user


@router.put("/{user_id}", response_model=UserSchema)
def update_user(
    *,
    db: Session = Depends(get_db),
    user_id: int,
    user_in: UserUpdate,
    current_user: User = Depends(get_current_active_superuser),
) -> Any:
    """
    Update a user (superuser only).
    """
    user = db.query(User).filter(User.id == user_id).first()

    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )

    # Update with new data
    update_data = user_in.model_dump(exclude_unset=True)

    # If password in update data, hash it
    if "password" in update_data and update_data["password"]:
        update_data["hashed_password"] = get_password_hash(update_data.pop("password"))

    # Update user object
    for field, value in update_data.items():
        if hasattr(user, field):
            setattr(user, field, value)

    # Save to database
    db.add(user)
    db.commit()
    db.refresh(user)

    return user