import {
	type Artifact,
	GRAPH_RENDER_MAX_ROUTED_EDGES,
	GRAPH_RENDER_MAX_ROUTED_NODES,
	type GraphRenderer,
	projectArtifactRelationships,
} from "@danypops/papyrus";

/**
 * Renders an artifact's direct relationships as a small graph when the neighbor set is real
 * (more than one node) and within the same bound Task graph rendering already enforces;
 * otherwise falls back to a plain, still name-resolved arrow list -- never the renderer's own
 * separate box-style fallback, so this view has exactly two shapes, not three.
 */
export function buildArtifactRelationshipLines(artifact: Artifact, renderer: GraphRenderer): string[] {
	const graph = projectArtifactRelationships(artifact);
	if (graph.edges.length === 0) return [];
	const withinBounds =
		graph.nodes.length > 1 && graph.nodes.length <= GRAPH_RENDER_MAX_ROUTED_NODES && graph.edges.length <= GRAPH_RENDER_MAX_ROUTED_EDGES;
	if (withinBounds) {
		const rendered = renderer.render(graph);
		if (rendered.lines.length > 0) return rendered.lines;
	}
	const labelById = new Map(graph.nodes.map((node) => [node.id, node.label]));
	return graph.edges.map((edge) => `${labelById.get(edge.from) ?? edge.from} --${edge.label}--> ${labelById.get(edge.to) ?? edge.to}`);
}