import { AcDbLayerTableRecord } from '@mlightcad/data-model';
/**
 * Layer flags that can be changed by `LAYISO` and restored by `LAYUNISO`.
 */
export interface AcApLayerIsoLayerState {
    /** Whether the layer is turned off. */
    isOff: boolean;
    /** Whether the layer is frozen. */
    isFrozen: boolean;
    /** Whether the layer is locked. */
    isLocked: boolean;
}
/**
 * Before/after snapshot for one layer affected by `LAYISO`.
 */
export interface AcApLayerIsoLayerSnapshot {
    /** Layer name at the time the snapshot was captured. */
    name: string;
    /** Layer state before `LAYISO` changed it. */
    before: AcApLayerIsoLayerState;
    /** Layer state immediately after `LAYISO` finished. */
    isolated: AcApLayerIsoLayerState;
}
/**
 * Snapshot for the most recent `LAYISO` command.
 */
export interface AcApLayerIsoSnapshot {
    /** Current layer before `LAYISO` ran. */
    currentLayerBefore: string;
    /** Current layer immediately after `LAYISO` finished. */
    currentLayerAfter: string;
    /** Layers whose state changed during `LAYISO`. */
    layers: AcApLayerIsoLayerSnapshot[];
}
/**
 * Stores the most recent `LAYISO` snapshot for `LAYUNISO`.
 */
export declare class AcApLayerIsoState {
    private static _snapshot;
    /**
     * Replaces the previous isolation snapshot.
     *
     * @param snapshot - Snapshot captured by the latest `LAYISO` run.
     */
    static set(snapshot: AcApLayerIsoSnapshot): void;
    /**
     * Consumes the current snapshot so `LAYUNISO` behaves as a one-shot restore.
     *
     * @returns Latest isolation snapshot, or `undefined` if `LAYISO` has not run.
     */
    static consume(): AcApLayerIsoSnapshot | undefined;
}
/**
 * Captures the layer state relevant to isolation.
 *
 * @param layer - Layer table record to inspect.
 * @returns Snapshot of visibility, freeze, and lock flags.
 */
export declare function getLayerIsoState(layer: AcDbLayerTableRecord): AcApLayerIsoLayerState;
/**
 * Compares two isolation layer states.
 *
 * @param a - First state.
 * @param b - Second state.
 * @returns `true` when all tracked flags match.
 */
export declare function isSameLayerIsoState(a: AcApLayerIsoLayerState, b: AcApLayerIsoLayerState): boolean;
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