import type { NumberArray } from 'cheminfo-types';

import { xCheck } from './xCheck.ts';
import type { XGetFromToIndexOptions } from './xGetFromToIndex.ts';
import { xGetFromToIndex } from './xGetFromToIndex.ts';

/**
 * Computes the index of the maximum of the given values
 * @param array - array of numbers
 * @param  options - options
 * @returns - index
 */
export function xMaxIndex(
  array: NumberArray,
  options: XGetFromToIndexOptions = {},
): number {
  xCheck(array);
  const { fromIndex, toIndex } = xGetFromToIndex(array, options);
  let maxIndex = fromIndex;

  for (let i = fromIndex + 1; i <= toIndex; i++) {
    if (array[i] > array[maxIndex]) {
      maxIndex = i;
    }
  }
  return maxIndex;
}