import { openWindow } from '..'
import { dataURLtoBlob, urlToBase64 } from './base64Conver'

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
  urlToBase64(url).then((base64) => {
    downloadByBase64(base64, filename, mime, bom)
  })
}

/**
 * Download pictures based on base64
 * @param buf
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByBase64(buf: string, filename: string, mime?: string, bom?: BlobPart) {
  const base64Buf = dataURLtoBlob(buf)
  downloadByData(base64Buf, filename, mime, bom)
}

/**
 * Download according to the background interface file stream
 * @param {*} data
 * @param {*} filename
 * @param {*} mime
 * @param {*} bom
 */
export function downloadByData(data: BlobPart, filename: string, mime?: string, bom?: BlobPart) {
  const blobData = typeof bom !== 'undefined' ? [bom, data] : [data]
  const blob = new Blob(blobData, { type: mime || 'application/octet-stream' })

  const blobURL = window.URL.createObjectURL(blob)
  const tempLink = document.createElement('a')
  tempLink.style.display = 'none'
  tempLink.href = blobURL
  tempLink.setAttribute('download', filename)
  if (typeof tempLink.download === 'undefined')
    tempLink.setAttribute('target', '_blank')

  document.body.appendChild(tempLink)
  tempLink.click()
  document.body.removeChild(tempLink)
  window.URL.revokeObjectURL(blobURL)
}

/**
 * Download file according to file address
 * @param {*} sUrl
 */
export function downloadByUrl({ url, target = '_blank', fileName }: { url: string, target?: TargetContext, fileName?: string }): boolean {
  const isChrome = window.navigator.userAgent.toLowerCase().includes('chrome')
  const isSafari = window.navigator.userAgent.toLowerCase().includes('safari')

  if (/(iP)/g.test(window.navigator.userAgent)) {
    console.error('Your browser does not support download!')
    return false
  }
  if (isChrome || isSafari) {
    const link = document.createElement('a')
    link.href = url
    link.target = target

    if (link.download !== undefined)
      link.download = fileName || url.substring(url.lastIndexOf('/') + 1, url.length)

    if (document.createEvent) {
      const e = document.createEvent('MouseEvents')
      e.initEvent('click', true, true)
      link.dispatchEvent(e)
      return true
    }
  }
  if (!url.includes('?'))
    url += '?download'

  openWindow(url, { target })
  return true
}