import { DominoValue } from '../game/DominoValue';
import { TrainBranch } from '../game/TrainData';
import { TrainLayoutEntry, TrainLayoutStyle, TrainSegment } from '../app/trainLayout';
export interface LayoutValidationIssue {
    code: string;
    message: string;
    index?: number;
}
export interface LayoutValidationResult {
    valid: boolean;
    issues: LayoutValidationIssue[];
}
export declare function projectOnTrainAxis(dx: number, dy: number, angle: number): number;
export declare function projectOnPerpendicularAxis(dx: number, dy: number, angle: number): number;
export declare function validateDominoChain(dominoes: readonly DominoValue[]): LayoutValidationResult;
export interface AxisPosition {
    along: number;
    perp: number;
}
/**
 * Reconstructs the expected position of every tile in train-axis space
 * (along the train and perpendicular to it), mirroring computeTrainLayout.
 * Positions are relative to the first tile, so only deltas are meaningful.
 */
export declare function expectedAxisLayout(layout: readonly TrainLayoutEntry[], layoutStyle: TrainLayoutStyle, outwardSign: number, dominoWidth?: number, dominoHeight?: number): AxisPosition[];
export declare function validateConsecutiveSpacing(layout: readonly TrainLayoutEntry[], angle: number, layoutStyle: TrainLayoutStyle, tolerance?: number, outwardSignOverride?: number): LayoutValidationResult;
export declare function validateNoPairOverlap(layout: readonly TrainLayoutEntry[], angle: number, layoutStyle: TrainLayoutStyle, tolerance?: number, outwardSignOverride?: number): LayoutValidationResult;
export declare function validateTrainLayout(layout: readonly TrainLayoutEntry[], dominoes: readonly DominoValue[], angle: number, layoutStyle: TrainLayoutStyle, tolerance?: number, outwardSignOverride?: number): LayoutValidationResult;
/**
 * Validates the chicken-foot branch tree as data: every chain links up, every
 * foot hangs off a real double, and every toe's first tile matches the double's
 * value. Recurses into nested feet.
 */
export declare function validateChickenFootChain(branch: TrainBranch): LayoutValidationResult;
/**
 * Validates a laid-out chicken-foot tree. Each run's tiles must link up by value
 * and match its tile count; each toe must start the right distance out from its
 * host double (measured along the toe's axis); and — the hard physical rule — no
 * two tiles anywhere in the tree may overlap.
 *
 * The center toe is a centered linear run while the inbound spine is offset, so
 * a single run can mix layout styles; the per-tile overlap test below checks the
 * real constraint directly rather than reconstructing each style's spacing.
 */
export declare function validateTrainTree(segments: readonly TrainSegment[], tolerance?: number): LayoutValidationResult;
export declare function dominoCorners(entry: TrainLayoutEntry, dominoWidth?: number, dominoHeight?: number): {
    x: number;
    y: number;
}[];