import type { DoubleMatrix } from 'cheminfo-types';
/**
 * Get min and max of the absolute values of Z.
 * @param matrix - matrix [rows][cols].
 */
export function matrixMinMaxAbsoluteZ(matrix: DoubleMatrix): {
  min: number;
  max: number;
} {
  if (matrix.length === 0 || matrix[0].length === 0) {
    throw new Error(
      'matrixMinMaxAbsoluteZ requires at least 1 row and 1 column',
    );
  }
  const nbRows = matrix.length;
  const nbColumns = matrix[0].length;

  let min = Number.POSITIVE_INFINITY;
  let max = Number.NEGATIVE_INFINITY;

  for (let column = 0; column < nbColumns; column++) {
    for (let row = 0; row < nbRows; row++) {
      let value = matrix[row][column];
      if (value < 0) value *= -1;
      if (value < min) min = value;
      if (value > max) max = value;
    }
  }

  return { min, max };
}