export type CanvasLayerKind = 'image' | 'video' | 'audio' | 'text' | 'rect' | 'roundRect' | 'ellipse' | 'triangle' | 'star' | 'hexagon' | 'pentagon' | 'diamond' | 'heart' | 'line' | 'arrow' | 'path' | 'sticky' | 'canvasPanel' | 'overlay' | 'border' | 'hBox' | 'vBox' | 'sizeBox' | 'scaleBox' | 'group' | 'widget' | 'namedSlot' | 'scrollBox' | 'wrapBox' | 'uniformGrid';
export type CanvasObjectFit = 'cover' | 'contain' | 'fill';
export type CanvasTextAlign = 'left' | 'center' | 'right';
export type CanvasFontStyle = 'normal' | 'italic';
export type CanvasTextDecoration = 'none' | 'underline' | 'line-through';
export type CanvasAlign = 'left' | 'center-h' | 'right' | 'top' | 'center-v' | 'bottom' | 'center' | 'full';
/** Normalized point inside a layer rect (0–1). */
export interface CanvasPoint {
    x: number;
    y: number;
}
export interface CanvasLayerRect {
    x: number;
    y: number;
    w: number;
    h: number;
}
/** UMG-style anchors (0–1 normalized against parent). */
export interface CanvasAnchors {
    minX: number;
    minY: number;
    maxX: number;
    maxY: number;
}
/** UMG slot: anchors + offsets in px relative to anchored edges. */
export interface CanvasSlot {
    anchors: CanvasAnchors;
    offsets: {
        left: number;
        top: number;
        right: number;
        bottom: number;
    };
    padding?: {
        left: number;
        top: number;
        right: number;
        bottom: number;
    };
    sizeRule?: 'auto' | 'fill' | 'fixed';
    alignment?: {
        x: number;
        y: number;
    };
    order?: number;
}
export interface CanvasExposedProp {
    id: string;
    targetLayerId: string;
    field: string;
    label: string;
    /** true = editable on instances (eye open) */
    exposed: boolean;
}
export interface CanvasWidgetDefinition {
    id: string;
    name: string;
    width: number;
    height: number;
    background?: string;
    layers: CanvasLayer[];
    exposed: CanvasExposedProp[];
}
export interface CanvasLayer {
    id: string;
    kind: CanvasLayerKind;
    name: string;
    src?: string;
    text?: string;
    fill?: string;
    stroke?: string;
    strokeWidth?: number;
    fontSize?: number;
    fontWeight?: number | string;
    fontFamily?: string;
    fontStyle?: CanvasFontStyle;
    textDecoration?: CanvasTextDecoration;
    letterSpacing?: number;
    lineHeight?: number;
    textAlign?: CanvasTextAlign;
    /**
     * When true, resizing the text box scales `fontSize` with the box
     * (geometric mean of width/height scale — Unreal/Canva-style).
     */
    autoSize?: boolean;
    /**
     * When true, resizing this container scales children (position + size + text)
     * relative to the parent — same idea as text `autoSize`. Groups default on.
     */
    autoSizeChildren?: boolean;
    color?: string;
    /** Text box background */
    textBackground?: string;
    objectFit?: CanvasObjectFit;
    borderRadius?: number;
    rotation?: number;
    flipX?: boolean;
    flipY?: boolean;
    shadowBlur?: number;
    shadowColor?: string;
    blur?: number;
    /** For `path`: normalized points (0–1) relative to rect. */
    points?: CanvasPoint[];
    /** For `path`: close the shape into a filled polygon. */
    closed?: boolean;
    /** Parent layer id; null/undefined = artboard root. */
    parentId?: string | null;
    /** UMG slot (preferred). When missing, derived from rect + top-left anchors. */
    slot?: CanvasSlot;
    clipChildren?: boolean;
    /** Gap for hBox / vBox / wrapBox / uniformGrid */
    gap?: number;
    /** namedSlot: public slot name exposed on the User Widget */
    slotName?: string;
    /** Child of a widget instance: which named slot to fill */
    fillSlot?: string;
    /** uniformGrid column count */
    columns?: number;
    /** kind === 'widget' */
    definitionId?: string;
    /** Exposed prop overrides on widget instances */
    overrides?: Record<string, unknown>;
    rect: CanvasLayerRect;
    zIndex: number;
    opacity: number;
    visible: boolean;
    locked: boolean;
}
export type CanvasGuideOrientation = 'horizontal' | 'vertical';
export interface CanvasGuide {
    id: string;
    orientation: CanvasGuideOrientation;
    /** X for vertical, Y for horizontal (document px). */
    position: number;
    locked?: boolean;
}
export interface CanvasDocument {
    version: 1 | 2;
    width: number;
    height: number;
    background: string;
    layers: CanvasLayer[];
    guides?: CanvasGuide[];
    /** When true, all guides are locked. */
    guidesLocked?: boolean;
    /** Local User Widget library (v2). */
    widgets?: CanvasWidgetDefinition[];
}
/** Top-left point anchors; offsets encode x/y/w/h without needing parent size. */
export declare function defaultSlotFromRect(rect: CanvasLayerRect, anchors?: CanvasAnchors): CanvasSlot;
/** For top-left point anchors, offsets.left/top = x/y and right/bottom = -(x+w)/-(y+h) when parent size unknown.
 * Prefer slotFromLocalRect from canvasHierarchy when parent size is known. */
export declare function rectFromSlot(slot: CanvasSlot, parentSize: {
    width: number;
    height: number;
}): CanvasLayerRect;
export declare function emptyCanvasDocument(partial?: Partial<Omit<CanvasDocument, 'version' | 'layers'>> & {
    layers?: CanvasLayer[];
    widgets?: CanvasWidgetDefinition[];
}): CanvasDocument;
/** Migrate v1 (flat absolute layers) → v2 (parentId + slot). */
export declare function migrateCanvasDocument(doc: CanvasDocument | (Omit<CanvasDocument, 'version'> & {
    version?: number;
})): CanvasDocument;
export declare function ensureLayerSlot(layer: CanvasLayer): CanvasLayer;
export declare function createCanvasGuide(orientation: CanvasGuideOrientation, position: number, partial?: Partial<Omit<CanvasGuide, 'id' | 'orientation' | 'position'>>): CanvasGuide;
export declare function createCanvasLayer(kind: CanvasLayerKind, partial?: Partial<Omit<CanvasLayer, 'id' | 'kind'>>): CanvasLayer;
/** Scalar fields that can reset to createCanvasLayer defaults (UE-style details). */
export type CanvasResettableField = 'opacity' | 'rotation' | 'visible' | 'locked' | 'flipX' | 'flipY' | 'blur' | 'shadowBlur' | 'shadowColor' | 'fill' | 'stroke' | 'strokeWidth' | 'fontSize' | 'fontWeight' | 'fontFamily' | 'fontStyle' | 'textDecoration' | 'letterSpacing' | 'lineHeight' | 'textAlign' | 'autoSize' | 'color' | 'textBackground' | 'objectFit' | 'borderRadius' | 'gap' | 'columns' | 'clipChildren' | 'autoSizeChildren' | 'text' | 'name';
/** Default value for a layer field (same as createCanvasLayer would use). */
export declare function canvasLayerFieldDefault(kind: CanvasLayerKind, field: CanvasResettableField): unknown;
export declare function isCanvasFieldModified(layer: CanvasLayer, field: CanvasResettableField): boolean;
export declare function resetCanvasField(layer: CanvasLayer, field: CanvasResettableField): Partial<CanvasLayer>;
/**
 * Scale fontSize with the box when `autoSize` is on (text / sticky).
 * Uses geometric mean of width & height scale so both axes affect size.
 */
export declare function applyTextAutoSize(from: CanvasLayer, to: CanvasLayer, prev: Pick<CanvasLayerRect, 'w' | 'h'>, next: Pick<CanvasLayerRect, 'w' | 'h'>): CanvasLayer;
export declare function reorderCanvasLayers(layers: CanvasLayer[], orderedIds: string[]): CanvasLayer[];
export declare function updateCanvasLayer(doc: CanvasDocument, layerId: string, updater: (l: CanvasLayer) => CanvasLayer): CanvasDocument;
export declare function updateCanvasLayers(doc: CanvasDocument, ids: string[], updater: (l: CanvasLayer) => CanvasLayer): CanvasDocument;
export declare function snapLayerRect(rect: CanvasLayerRect, cellSize: number, enabled: boolean, bounds: {
    width: number;
    height: number;
}, minW?: number, minH?: number, guides?: Pick<CanvasGuide, 'orientation' | 'position'>[], guideThreshold?: number, clampToBounds?: boolean): CanvasLayerRect;
/** Snap left / center / right (or top / middle / bottom) edges to guides. */
export declare function snapRectToGuides(rect: CanvasLayerRect, guides: Pick<CanvasGuide, 'orientation' | 'position'>[], threshold?: number): CanvasLayerRect;
export declare function alignLayerRect(rect: CanvasLayerRect, bounds: {
    width: number;
    height: number;
}, align: CanvasAlign): CanvasLayerRect;
export declare const CANVAS_PRESETS: readonly [{
    readonly id: "hd";
    readonly label: "HD · 1280×720";
    readonly width: 1280;
    readonly height: 720;
}, {
    readonly id: "fhd";
    readonly label: "Full HD · 1920×1080";
    readonly width: 1920;
    readonly height: 1080;
}, {
    readonly id: "square";
    readonly label: "Instagram · 1080×1080";
    readonly width: 1080;
    readonly height: 1080;
}, {
    readonly id: "story";
    readonly label: "Story · 1080×1920";
    readonly width: 1080;
    readonly height: 1920;
}, {
    readonly id: "landscape";
    readonly label: "Landscape · 1600×900";
    readonly width: 1600;
    readonly height: 900;
}, {
    readonly id: "presentation";
    readonly label: "Presentation · 1920×1080";
    readonly width: 1920;
    readonly height: 1080;
}, {
    readonly id: "a4";
    readonly label: "A4 · 794×1123";
    readonly width: 794;
    readonly height: 1123;
}, {
    readonly id: "twitter";
    readonly label: "X Post · 1600×900";
    readonly width: 1600;
    readonly height: 900;
}];
export declare function presetIdForSize(width: number, height: number): string;
/** Build a path layer from absolute document points. */
export declare function createPathFromDocPoints(docPoints: {
    x: number;
    y: number;
}[], opts?: {
    closed?: boolean;
    fill?: string;
    strokeWidth?: number;
    name?: string;
    zIndex?: number;
}): CanvasLayer;
/** Recompute rect + normalized points after editing absolute doc points. */
export declare function rebakePathLayer(layer: CanvasLayer, docPoints: {
    x: number;
    y: number;
}[]): CanvasLayer;
/** Map normalized path points → document space using an absolute (or local) rect. */
export declare function pathPointsToDoc(layer: CanvasLayer, absRect?: Pick<CanvasLayerRect, 'x' | 'y' | 'w' | 'h'>): {
    x: number;
    y: number;
}[];