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//! Declarative macros for pe-core.
//!
//! `core_state_fields!()` — convenience macro that embeds the standard
//! `CoreState` fields into a user's state struct.
/// Embeds the standard CoreState fields into a state struct.
///
/// These fields are required for any state that implements `CoreState`.
/// The `#[core]` attribute signals to `#[derive(State)]` that it should
/// generate the `CoreState` trait impl.
///
/// # Usage
///
/// ```ignore
/// use pe_core::core_state_fields;
///
/// #[derive(State, Clone, Debug, Serialize, Deserialize)]
/// struct MyAgentState {
/// core_state_fields!(),
///
/// // Your custom fields here
/// topic: String,
/// }
/// ```
///
/// # Expands to
///
/// ```ignore
/// #[core]
/// messages: Vec<Message>,
/// #[core]
/// iterations: u32,
/// #[core]
/// thread_id: String,
/// #[core]
/// context: ExecutionContext,
/// ```
#[macro_export]
macro_rules! core_state_fields {
() => {
/// Message history — uses add_messages reducer (append + dedup by id)
#[core]
pub messages: Vec<$crate::message::Message>,
/// Current iteration count — LastValue channel
#[core]
pub iterations: u32,
/// Thread identifier — LastValue channel
#[core]
pub thread_id: String,
/// Execution context injected by runtime — LastValue channel
#[core]
pub context: $crate::state::ExecutionContext,
};
}