import { AcApContext } from '../../app';
import { AcEdCommand } from '../../editor';
/**
 * Global store for layer state snapshots to support LAYERP command.
 */
declare class AcApLayerPreviousStateManager {
    private previousSnapshot;
    /**
     * Captures the current layer state.
     * @param context - Active application context
     */
    captureState(context: AcApContext): void;
    /**
     * Restores the previous layer state.
     * @param context - Active application context
     * @returns true if restoration was successful
     */
    restorePreviousState(context: AcApContext): boolean;
    /**
     * Clears the previous state snapshot.
     */
    clearPreviousState(): void;
    /**
     * Checks if a layer is locked.
     * @param layer - Layer table record
     */
    private isLayerLocked;
    /**
     * Sets or clears the locked bit in layer flags.
     * @param layer - Layer table record
     * @param locked - Whether the layer should be locked
     */
    private setLayerLocked;
    /**
     * Sets or clears the frozen bit in layer flags.
     * @param layer - Layer table record
     * @param frozen - Whether the layer should be frozen
     */
    private setLayerFrozen;
}
/**
 * Exposes layer previous state manager for external use.
 */
export declare function getLayerPreviousStateManager(): AcApLayerPreviousStateManager;
/**
 * AutoCAD-like `LAYERP` command.
 *
 * The command restores the layer state to what it was before the last
 * layer-modifying operation. This includes changes to layer on/off,
 * freeze/thaw, and lock/unlock states.
 *
 * Note: This is a simplified implementation that tracks one previous state.
 * A full implementation would maintain a stack of states.
 */
export declare class AcApLayerPCmd extends AcEdCommand {
    /**
     * Creates a write-enabled `LAYERP` command instance.
     */
    constructor();
    /**
     * Runs the restore-previous-layer-state workflow.
     *
     * @param context - Active application context used to update the current drawing.
     * @returns Resolves when the restoration is complete or if there is nothing to restore.
     */
    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;
}
/**
 * Captures layer state before executing a layer-modifying command.
 * Should be called before executing commands like LAYOFF, LAYFRZ, LAYLCK, etc.
 *
 * @param context - Active application context
 */
export declare function captureLayerStateBeforeOperation(context: AcApContext): void;
export {};
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