// Sizing rules for the HTML5 <video> element in the full-screen player.
// Extracted from VideoPlayer.svelte so the fit behaviour is unit-testable.

/**
 * Classes applied to the <video> element so it fits the player viewport.
 *
 * TRACES: UR-005
 *
 * `max-w-full max-h-full` only ever *shrinks* oversized media, so a source
 * smaller than the window (e.g. 480p on a 1080p display) rendered at its
 * intrinsic size - a small box in the middle of a black screen. Filling the
 * container and letting `object-contain` do the scaling fits the picture to
 * whichever axis constrains it, in both directions, preserving aspect ratio.
 */
export function videoFitClass(): string {
  return "w-full h-full object-contain";
}