export function calculateColWidths (head: string[], rows: string[][], maxWidth: number): number[] {
  const MIN_NEEDED_WIDTH = 40
  const BORDER_WITH_PADDING_LENGTH = 3
  const colWidths = rows.concat([head]).map(getItemLengths).reduce(getMaxColumnLengths)
  const tableContentWidth = colWidths.reduce(sum)
  const tablePaddingWidth = colWidths.length * BORDER_WITH_PADDING_LENGTH + 1
  const neededWidth = Math.max(maxWidth, MIN_NEEDED_WIDTH) - tablePaddingWidth

  if (tableContentWidth > neededWidth) {
    return reduceWidths(colWidths, tableContentWidth, neededWidth)
  }

  return []
}

function getItemLengths (row: string[]): number[] {
  return row.map((item: string): number => item.length)
}

function getMaxColumnLengths (previousRow: number[], currentRow: number[]): number[] {
  return currentRow.map((item: number, index: number): number => Math.max(previousRow[index], item))
}

function sum (previousValue: number, currentValue: number): number {
  return previousValue + currentValue
}

function reduceWidths (colWidths: number[], width: number, neededWidth: number): number[] {
  const factor = width / neededWidth

  return colWidths.map((item: number) => Math.ceil(item / factor))
}