use pyo3::FromPyObject;
use python_utils::{FromPyFromStr, ToStrToPy};
use string_literal::StringLiteral;

use crate::{entity_id::EntityId, state_object::StateObject};

#[derive(Debug, Clone, StringLiteral, FromPyFromStr, ToStrToPy)]
#[string_literal(value = "state_changed")]
pub struct Type;

#[derive(Debug, FromPyObject)]
#[pyo3(from_item_all)]
pub struct Data<
    OldState,
    OldAttributes,
    OldStateContextEvent,
    NewState,
    NewAttributes,
    NewStateContextEvent,
> {
    pub entity_id: EntityId,
    pub old_state: Option<StateObject<OldState, OldAttributes, OldStateContextEvent>>,
    pub new_state: Option<StateObject<NewState, NewAttributes, NewStateContextEvent>>,
}

/// A state changed event is fired when on state write the state is changed.
pub type Event<
    OldState,
    OldAttributes,
    OldStateContextEvent,
    NewState,
    NewAttributes,
    NewStateContextEvent,
    Context,
> = super::super::Event<
    Type,
    Data<
        OldState,
        OldAttributes,
        OldStateContextEvent,
        NewState,
        NewAttributes,
        NewStateContextEvent,
    >,
    Context,
>;