import { AfterContentInit, Component, ContentChildren, Input, OnChanges, OnInit, QueryList, TemplateRef } from '@angular/core'
import { MarkdownService } from '@app/core'
import { I18n } from '@ngx-translate/i18n-polyfill'
import { PeerTubeTemplateDirective } from '../angular'

@Component({
  selector: 'my-help',
  styleUrls: [ './help.component.scss' ],
  templateUrl: './help.component.html'
})

export class HelpComponent implements OnInit, OnChanges, AfterContentInit {
  @Input() helpType: 'custom' | 'markdownText' | 'markdownEnhanced' = 'custom'
  @Input() tooltipPlacement = 'right auto'

  @ContentChildren(PeerTubeTemplateDirective) templates: QueryList<PeerTubeTemplateDirective<'preHtml' | 'customHtml' | 'postHtml'>>

  isPopoverOpened = false
  mainHtml = ''

  preHtmlTemplate: TemplateRef<any>
  customHtmlTemplate: TemplateRef<any>
  postHtmlTemplate: TemplateRef<any>

  constructor (private i18n: I18n) { }

  ngOnInit () {
    this.init()
  }

  ngAfterContentInit () {
    {
      const t = this.templates.find(t => t.name === 'preHtml')
      if (t) this.preHtmlTemplate = t.template
    }

    {
      const t = this.templates.find(t => t.name === 'customHtml')
      if (t) this.customHtmlTemplate = t.template
    }

    {
      const t = this.templates.find(t => t.name === 'postHtml')
      if (t) this.postHtmlTemplate = t.template
    }
  }

  ngOnChanges () {
    this.init()
  }

  onPopoverHidden () {
    this.isPopoverOpened = false
  }

  onPopoverShown () {
    this.isPopoverOpened = true
  }

  private init () {
    if (this.helpType === 'markdownText') {
      this.mainHtml = this.formatMarkdownSupport(MarkdownService.TEXT_RULES)
      return
    }

    if (this.helpType === 'markdownEnhanced') {
      this.mainHtml = this.formatMarkdownSupport(MarkdownService.ENHANCED_RULES)
      return
    }
  }

  private formatMarkdownSupport (rules: string[]) {
    // tslint:disable:max-line-length
    return this.i18n('<a href="https://en.wikipedia.org/wiki/Markdown#Example" target="_blank" rel="noopener noreferrer">Markdown</a> compatible that supports:') +
      this.createMarkdownList(rules)
  }

  private createMarkdownList (rules: string[]) {
    const rulesToText = {
      'emphasis': this.i18n('Emphasis'),
      'link': this.i18n('Links'),
      'newline': this.i18n('New lines'),
      'list': this.i18n('Lists'),
      'image': this.i18n('Images')
    }

    const bullets = rules.map(r => rulesToText[r])
      .filter(text => text)
      .map(text => '<li>' + text + '</li>')
      .join('')

    return '<ul>' + bullets + '</ul>'
  }
}