import type { MessageResponse } from "#client/message-response.js";
import type { EveAgentReducer } from "#client/reducer.js";
import type { ClientSession } from "#client/session.js";
import type { MessageStreamEvent } from "#protocol/message.js";
import type { CancelSessionResult, ClientAuth, ClientSessionState, HeadersValue, SendTurnPayload } from "#client/types.js";
/**
 * Lifecycle state of an eve frontend session store: `ready` (idle),
 * `resuming` (checking an attached session for continuation), `submitted`
 * (turn sent, awaiting the first event), `streaming` (events arriving), and
 * `error` (session creation, streaming, resume, or a turn failed).
 */
export type EveAgentStoreStatus = "error" | "ready" | "resuming" | "streaming" | "submitted";
/**
 * Prepares one outbound turn immediately before the client sends it, for
 * example to attach fresh one-turn page state through `clientContext`.
 */
export type PrepareSend = (input: SendTurnPayload) => SendTurnPayload | Promise<SendTurnPayload>;
/** Immutable projected state of an eve frontend session store. */
export interface EveAgentStoreSnapshot<TData> {
    readonly data: TData;
    /** The latest session creation, stream, resume, or turn failure. */
    readonly error: Error | undefined;
    readonly events: readonly MessageStreamEvent[];
    readonly session: ClientSessionState | undefined;
    readonly status: EveAgentStoreStatus;
}
/**
 * Hooks invoked during session creation and turn processing. The observation callbacks
 * do not alter execution; `prepareSend` may replace the outbound turn payload.
 */
export interface EveAgentStoreCallbacks<TData> {
    readonly onError?: (error: Error) => void;
    readonly onEvent?: (event: MessageStreamEvent) => void;
    readonly onFinish?: (snapshot: EveAgentStoreSnapshot<TData>) => void;
    readonly onSessionChange?: (session: ClientSessionState | undefined) => void;
    readonly prepareSend?: PrepareSend;
}
/**
 * Configuration for constructing an eve frontend session store. Pass either
 * connection options for a store-owned session or an existing `ClientSession`.
 * Saved events must be an ordered prefix of the same session stream.
 */
export interface EveAgentStoreInit<TData> {
    readonly prewarm?: boolean;
    readonly auth?: ClientAuth;
    readonly headers?: HeadersValue;
    readonly host?: string;
    /** Ordered prefix of the session stream used to rehydrate projected state. */
    readonly initialEvents?: readonly MessageStreamEvent[];
    readonly initialSession?: ClientSessionState;
    readonly optimistic?: boolean;
    readonly reducer: EveAgentReducer<TData>;
    readonly session?: ClientSession;
}
export interface PendingMessageSubmission {
    readonly createdAt: number;
    readonly eventStartIndex: number;
    readonly id: string;
    readonly message: string;
    readonly requiresDeliveryId: boolean;
    readonly deliveryId?: string;
}
export interface ActiveTurn {
    readonly abortController: AbortController;
    acceptedFollowUps: number;
    readonly cancel: () => Promise<CancelSessionResult>;
    readonly completion: Promise<void>;
    readonly followUpDispatches: Set<Promise<void>>;
    receivedFollowUps: number;
    readonly receivedFollowUpEvents: Map<MessageStreamEvent, number>;
    readonly followUpSubmissionIds: Set<string>;
    readonly resolveCompletion: () => void;
    readonly response: Promise<MessageResponse | undefined>;
    readonly resolveResponse: (response: MessageResponse | undefined) => void;
}