import { AcApContext } from '../../app';
import { AcEdCommand } from '../../editor';
/**
 * AutoCAD-like `LAYOFF` command.
 *
 * The command repeatedly asks the user to pick an entity and turns off the
 * corresponding layer. It also supports AutoCAD-style `Settings` and `Undo`
 * branches during the same command session.
 *
 * Current viewer limitations:
 * - Only one global viewport is available, so `Vpfreeze` behaves like `Off`.
 * - Nested block/xref sub-entity picking is not exposed yet, so the block
 *   selection setting is stored for future use but does not currently change
 *   the resolved target layer.
 */
export declare class AcApLayoffCmd extends AcEdCommand {
    private static _settings;
    private _history;
    private _vpfreezeHintShown;
    /**
     * Creates a write-enabled `LAYOFF` command instance.
     */
    constructor();
    /**
     * Runs the interactive turn-layer-off workflow until the user cancels.
     *
     * The command keeps an in-memory undo stack for the current invocation and
     * reuses the static settings chosen in previous `LAYOFF` runs.
     *
     * @param context - Active application context used to read and update the current drawing.
     * @returns Resolves when the command loop ends.
     */
    execute(context: AcApContext): Promise<void>;
    /**
     * Sends a localized status message through the command-line output.
     *
     * @param message - Text to display to the user.
     * @param type - Visual severity mapped to command-line message styles.
     */
    private notify;
    /**
     * Registers a localized keyword on an entity or keyword prompt.
     *
     * @param prompt - Prompt instance that should expose the keyword to the user.
     * @param key - I18n keyword identifier under `jig.layoff.keywords`.
     */
    private addKeyword;
    /**
     * Prompts for either a picked entity or one of the top-level command keywords.
     *
     * @returns Resolved selection or keyword action, or `undefined` when the user cancels.
     */
    private promptSelection;
    /**
     * Opens the `Settings` branch and keeps prompting until the user exits it.
     *
     * @returns Resolves when the settings submenu is closed.
     */
    private runSettings;
    /**
     * Prompts for the viewport-specific off mode to persist for later selections.
     *
     * `Vpfreeze` currently falls back to a global off state because the viewer
     * does not expose per-viewport layer visibility.
     *
     * @returns Resolves when the prompt is dismissed or the setting is updated.
     */
    private promptViewportMode;
    /**
     * Prompts for how nested block selections should resolve their target layer.
     *
     * The chosen value is persisted for future parity with AutoCAD even though
     * nested selection handling is not implemented yet.
     *
     * @returns Resolves when the prompt is dismissed or the setting is updated.
     */
    private promptBlockSelectionMode;
    /**
     * Resolves the picked entity's layer and turns it off when allowed.
     *
     * The method validates the selection, prevents turning off the current layer,
     * records undo history, and clears the selection set after a successful edit.
     *
     * @param context - Active application context containing the current database and view.
     * @param objectId - Identifier of the entity selected by the user.
     */
    private turnOffEntityLayer;
    /**
     * Restores the most recently changed layer-off state captured during this run.
     *
     * @param context - Active application context containing the current database and view.
     */
    private runUndo;
}
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