import type { IsotypeColorKey } from './patterns';

/**
 * Ordered `[back, front]` color pair for `IsotypeTwist`. The front (second)
 * color is painted on top and dominates the intersection blend produced by
 * `mix-blend-mode` — the blended color is never hardcoded, only derived.
 */
export type IsotypeTwistPair = readonly [IsotypeColorKey, IsotypeColorKey];

/** Only these two brand color pairs are in rotation — widen deliberately, not speculatively. */
export type IsotypeTwistVariantId = 'magenta-blue' | 'blue-red';

export const ISOTYPE_TWIST_VARIANTS: Record<IsotypeTwistVariantId, IsotypeTwistPair> = {
  'magenta-blue': ['magenta', 'blue'],
  'blue-red': ['blue', 'red'],
};

export const ISOTYPE_TWIST_VARIANT_IDS = Object.keys(
  ISOTYPE_TWIST_VARIANTS
) as IsotypeTwistVariantId[];