/**
 * Canonical message action contract for Athena discussion UI.
 * Presentation-only: consumers pass identity/permissions/state; this module
 * derives which actions are available vs disabled and why.
 */
export type ChatMessageAction = "reply" | "edit" | "delete" | "copy" | "retry" | "react" | "open-reference" | "open-attachment" | "custom";
/** Client-visible delivery lifecycle (maps to backend send + optimistic UX). */
export type ChatMessageDeliveryState = "draft" | "queued" | "uploading" | "sending" | "sent" | "upload_failed" | "send_failed" | "retrying" | "edited" | "deleted";
export interface ChatMessageActionContext {
    /** Attachment-only messages cannot be edited for text. */
    attachmentOnly?: boolean;
    /** Consumer can moderate (delete others, etc.). */
    canModerate?: boolean;
    /** Consumer may react on this message. */
    canReact?: boolean;
    /** Delivery / lifecycle state. Defaults to sent when omitted. */
    deliveryState?: ChatMessageDeliveryState | null;
    /** Message has one or more attachments. */
    hasAttachments?: boolean;
    /** Message has non-empty editable text body. */
    hasEditableText?: boolean;
    /** Message has a reply target reference. */
    hasReference?: boolean;
    /** Current user authored the message. */
    isAuthor?: boolean;
    /** Soft-deleted / tombstone. */
    isDeleted?: boolean;
    /**
     * Optional hard policy overrides. `false` removes the action entirely;
     * `true` does not force-enable past safety rules for failed/deleted states.
     */
    policy?: Partial<Record<ChatMessageAction, boolean>>;
}
export interface ChatMessageActionAvailability {
    action: ChatMessageAction;
    disabled: boolean;
    /** Machine-readable reason when disabled or hidden. */
    reason?: string;
    visible: boolean;
}
/**
 * Resolves which standard message actions are visible/enabled for a message.
 */
export declare function resolveChatMessageActions(context?: ChatMessageActionContext): ChatMessageActionAvailability[];
/**
 * Convenience: list of enabled + visible action ids.
 */
export declare function listEnabledChatMessageActions(context?: ChatMessageActionContext): ChatMessageAction[];
/**
 * Compact flags for same-sender grouping in discussion lists.
 */
export declare function resolveGroupedMessagePresentation(input: {
    previousSenderId?: string | null;
    senderId: string;
}): {
    compact: boolean;
    hideAvatar: boolean;
    hideMeta: boolean;
};