// ==========================================================================
// TREE UTILS — pure helpers over the tree node data (no PixiJS, no DOM).
// ==========================================================================

import { treeNodes, type TreeNode } from '$lib/data';
import { NODE_RADII, MOBILE_RADIUS_FACTOR } from '$lib/config';

/** Look up a node by id. */
export function getNodeById(id: string): TreeNode | undefined {
	return treeNodes.find((node) => node.id === id);
}

/** Rendered radius for a node size, scaled down on mobile. */
export function getNodeRadius(size: TreeNode['size'], isMobile: boolean): number {
	const base = NODE_RADII[size] ?? NODE_RADII.default;
	return base * (isMobile ? MOBILE_RADIUS_FACTOR : 1);
}

/** Euclidean distance of a node from the tree centre (0, 0). */
export function getDistanceFromOrigin(node: TreeNode): number {
	return Math.sqrt(node.x * node.x + node.y * node.y);
}

/**
 * Plasma-beam intensity for the connection feeding a node. Skills scale with
 * years of experience (0.3–1.0); other categories use fixed tiers.
 */
export function getBeamIntensity(node: TreeNode): number {
	if (node.category === 'skills' && node.yearsOfExperience) {
		return Math.min(0.3 + (node.yearsOfExperience / 10) * 0.7, 1.0);
	}
	if (node.category === 'experience') return 0.7;
	if (node.category === 'origin') return 1.0;
	return 0.5; // projects and education
}