import type {
	GraphDocument2d,
	PackedSceneGeometry,
	PolylineLayer,
	RenderScene2d,
	Viewport
} from './types';
import type { SpatialResourceKey } from './tiles';

export type BuildMetrics = {
	queueMs: number;
	buildMs: number;
	packingMs?: number;
	reusedLayerCount: number;
	reusedParseCount: number;
	reusedAnalysisCount: number;
	reusedCompiledCount: number;
	cachedLayerEntryCount: number;
};

export type SceneBuildRequest = {
	kind: 'scene';
	id: number;
	document: GraphDocument2d;
	receivedAt: number;
};

export type SpatialTileBuildRequest = {
	kind: 'spatial-tile';
	id: number;
	document: GraphDocument2d;
	expressionId: string;
	viewport: Viewport;
	resource: SpatialResourceKey;
	receivedAt: number;
};

export type WorkerBuildRequest = SceneBuildRequest | SpatialTileBuildRequest;

export type WorkerBuildResponse =
	| {
			kind: 'scene';
			id: number;
			scene: RenderScene2d;
			geometry?: PackedSceneGeometry;
			metrics: BuildMetrics;
	  }
	| {
			kind: 'spatial-tile';
			id: number;
			resource: SpatialResourceKey;
			scene: RenderScene2d;
			mask?: InequalityTileMask;
			polylines?: PackedTilePolyline[];
			metrics: BuildMetrics;
	  }
	| { kind: 'error'; id: number; error: string }
	| { kind: 'superseded'; id: number };

export interface SpatialTileResult {
	resource: SpatialResourceKey;
	scene: RenderScene2d;
	mask?: InequalityTileMask;
	polylines?: PackedTilePolyline[];
}

export interface InequalityTileMask {
	width: number;
	height: number;
	alpha: Uint8Array;
	color: string;
}

export interface PackedTilePolyline {
	/** Interleaved math-space x/y coordinates. */
	coordinates: Float64Array;
	/** Exclusive vertex indexes at which disconnected paths end. */
	breaks: Uint32Array;
	layer: Omit<PolylineLayer, 'vertices' | 'breaks'>;
}