const download0 = (data: Blob, fileName: string, mineType: string) => {
  // 创建 blob
  const blob = new Blob([data], { type: mineType })
  // 创建 href 超链接，点击进行下载
  window.URL = window.URL || window.webkitURL
  const href = URL.createObjectURL(blob)
  const downA = document.createElement('a')
  downA.href = href
  downA.download = fileName
  downA.click()
  // 销毁超连接
  window.URL.revokeObjectURL(href)
}

const download = {
  // 下载 Excel 方法
  excel: (data: Blob, fileName: string) => {
    download0(data, fileName, 'application/vnd.ms-excel')
  },
  // 下载 Word 方法
  word: (data: Blob, fileName: string) => {
    download0(data, fileName, 'application/msword')
  },
  // 下载 Zip 方法
  zip: (data: Blob, fileName: string) => {
    download0(data, fileName, 'application/zip')
  },
  // 下载 Html 方法
  html: (data: Blob, fileName: string) => {
    download0(data, fileName, 'text/html')
  },
  // 下载 Markdown 方法
  markdown: (data: Blob, fileName: string) => {
    download0(data, fileName, 'text/markdown')
  }
}

export default download

/** 图片下载(通过浏览器图片下载)  */
export const downloadImage = async (imageUrl) => {
  const image = new Image()
  image.setAttribute('crossOrigin', 'anonymous')
  image.src = imageUrl
  image.onload = () => {
    const canvas = document.createElement('canvas')
    canvas.width = image.width
    canvas.height = image.height
    const ctx = canvas.getContext('2d') as CanvasDrawImage
    ctx.drawImage(image, 0, 0, image.width, image.height)
    const url = canvas.toDataURL('image/png')
    const a = document.createElement('a')
    a.href = url
    a.download = 'image.png'
    a.click()
  }
}
