StringUtils.ts

import memoize from 'lodash.memoize'

export const isString = (value: any) => typeof value === 'string'

export namespace StringUtils {
  export const classPrefix = 'mde'

  export const truncate = (str: string, max: number = 40) => {
    return isString(str) && str.length > max ? str.slice(0, max) + '...' : str
  }

  /**
   * Five levels of brightness from 1 to 5.
   *
   * @param brightness
   */
  export const getRandomColor = (brightness: number) => {
    if (brightness < 1 || brightness > 5)
      throw new Error(
        'Only five brightness levels, from 1 to 5, are acceptable.',
      )

    const variance = 255 / 5

    const getByte = () =>
      Math.round(variance * (brightness - 1) + Math.random() * variance)

    const rgb = [0, 0, 0].map(() => getByte()).join(',')

    return `rgb(${rgb})`
  }

  export const toClipboard = (data: string, mimeType = 'text/plain') => {
    document.addEventListener('copy', function (event: ClipboardEvent) {
      event.clipboardData?.setData(mimeType, data)
      event.preventDefault()
    })
    document.execCommand('copy', false)
  }

  export const getSize = memoize((content: string) => new Blob([content]).size)

  export function getPrefixedClass(className) {
    return `${classPrefix}-${className}`
  }
}