/**
 * @description download attachment menu
 * @author wangfupeng
 */

import { DomEditor, IDomEditor, SlateRange, t } from '@wangeditor/editor'
import { IButtonMenu } from '@wangeditor/editor'
import { DOWNLOAD_SVG } from '../../constants/icon-svg'
import { AttachmentElement } from '../custom-types'

class DownloadAttachmentMenu implements IButtonMenu {
  readonly title = t('attachment.download')
  readonly iconSvg = DOWNLOAD_SVG
  readonly tag = 'button'
  readonly alwaysEnable = true

  getValue(editor: IDomEditor): string | boolean {
    const attachmentElem = this.getSelectedElem(editor)
    if (attachmentElem == null) return ''
    return attachmentElem.link
  }

  isActive(editor: IDomEditor): boolean {
    // 任何时候，都不用激活 menu
    return false
  }

  exec(editor: IDomEditor, value: string | boolean) {
    if (!value) return
    if (typeof value !== 'string') return
    window.open(value, '_blank')
  }

  isDisabled(editor: IDomEditor): boolean {
    const { selection } = editor
    if (selection == null) return true
    if (SlateRange.isExpanded(selection)) return true // 选区非折叠，禁用

    // 未匹配到 attachment node 则禁用
    const attachmentElem = this.getSelectedElem(editor)
    if (attachmentElem == null) return true

    return false
  }

  private getSelectedElem(editor: IDomEditor): AttachmentElement | null {
    const node = DomEditor.getSelectedNodeByType(editor, 'attachment')
    if (node == null) return null
    return node as AttachmentElement
  }
}

export default DownloadAttachmentMenu