day-14.ts

/**
 * Re-order multiple tabs at the same time and relatively to others (as browsers do).
 *
 * In modern browsers including Mozilla Firefox or Google Chrome,
 * users can easily select N non-contiguous tabs at the same time
 * and reorder them in a single move.
 *
 * For instance if you have the tabs, A, B, C, D and E
 * you can select A and C and move them after D
 * to get B, D, A, C and E.
 *
 * @param tabs - The original set of tabs of the browser
 * @param selectedTabs - The tab currently being moved, a subarray of tabs
 * @param moveBeforeTab - One of the tabs oftabs but not of selectedTabs taken as a reference for the dropping place
 *
 * @returns
 * New tabs configuration after the drop.
 */
export function reorderTabs(
  tabs: number[],
  selectedTabs: number[],
  moveBeforeTab: number
): number[] {
  const unmovedTabs = tabs.filter((t) => !selectedTabs.includes(t));
  const indexInUnmoved = unmovedTabs.indexOf(moveBeforeTab);
  return [
    ...unmovedTabs.slice(0, indexInUnmoved),
    ...selectedTabs,
    ...unmovedTabs.slice(indexInUnmoved),
  ];
}