import type { CodeService, ContentService, CoreService } from '../core/tokens'
import { eventBus } from '../core/event-bus'
import { createCopyText, flashCopiedTooltip } from '../utils'

const CellTooltip = window.CellTooltip
const copyText = createCopyText()

/**
 * Content module — details toggle, tooltips, footnotes, SVG icons, and link guard.
 *
 * Responsibilities:
 * - Attach toggle behaviour to `.details` elements.
 * - Initialize CellTooltip on action buttons, copy buttons, and footnotes.
 * - Fetch and inline SVG icons from `data-svg-src` attributes.
 * - Set up link guard dialog for external link confirmation.
 * - Re-initialize components after encrypted content is decrypted.
 */
export class ContentModule implements ContentService {
  constructor(
    private readonly core: CoreService,
    private readonly code: CodeService,
  ) {}

  /** Fetch and inline SVG icons referenced by `data-svg-src` attributes. */
  initSVGIcon() {
    document.querySelectorAll<HTMLElement>('[data-svg-src]').forEach(($icon) => {
      fetch($icon.dataset.svgSrc!)
        .then(response => response.text())
        .then((svg) => {
          const $temp = document.createElement('div')
          $temp.insertAdjacentHTML('afterbegin', svg)
          const $svg = $temp.firstChild as SVGElement
          $svg.dataset.svgSrc = $icon.dataset.svgSrc
          $svg.classList.add('icon')
          const $titleElements = $svg.getElementsByTagName('title')
          $titleElements.length && $svg.removeChild($titleElements[0])
          $icon.parentElement!.replaceChild($svg, $icon)
        })
        .catch((err) => {
          console.error(err)
        })
    })
  }

  /**
   * Initialize the link-guard dialog and bind click handlers on guarded links.
   * @param target - The root element to search for guarded links.
   */
  initLinkGuardDialog(target: Element | Document = document) {
    const dialog = document.getElementById('link-guard-dialog') as HTMLDialogElement
    if (!dialog)
      return

    const $target = dialog.querySelector<HTMLElement>('.target')
    const $copy = dialog.querySelector<HTMLElement>('.copy-icon-btn')
    const $confirm = dialog.querySelector<HTMLElement>('.confirm-btn')
    const $cancel = dialog.querySelector<HTMLElement>('.cancel-btn')

    const _closeDialog = () => {
      if (dialog.open)
        dialog.close()
      ;(dialog as any)._target = null
      if ($target) {
        $target.textContent = '-'
      }
    }

    if (!dialog.dataset.init) {
      dialog.dataset.init = 'true'

      $confirm!.addEventListener('click', () => {
        if ((dialog as any)._target) {
          window.open((dialog as any)._target, '_blank', 'noopener,noreferrer')
        }
        _closeDialog()
      })

      $cancel!.addEventListener('click', _closeDialog)

      $copy!.addEventListener('click', () => {
        const textToCopy = (dialog as any)._target || ''
        if (!textToCopy)
          return
        copyText(textToCopy).then(() => {
          flashCopiedTooltip($copy!)
        })
      })
    }

    target.querySelectorAll<HTMLAnchorElement>('a[target="_blank"][data-guard="modal"]:not([data-init])').forEach(($link) => {
      $link.dataset.init = 'true'
      $link.addEventListener('click', (e) => {
        e.preventDefault()
        let targetUrl = $link.href
        try {
          const guardUrl = new URL($link.href)
          targetUrl = guardUrl.searchParams.get('target') || targetUrl
        }
        catch {
          // Ignore malformed URLs and fall back to the original href.
        }

        ;(dialog as any)._target = targetUrl
        if ($target) {
          $target.textContent = targetUrl
        }
        dialog.showModal()
        ;(document.activeElement as HTMLElement)?.blur()
      }, false)
    })
  }

  /**
   * Attach toggle behaviour to `.details` elements.
   * @param target - The root element to search within.
   */
  initDetails(target: Element | Document = document) {
    target.querySelectorAll<HTMLElement>('.details:not(.disabled)').forEach(($details) => {
      const $summary = $details.querySelector<HTMLElement>('.details-summary')!
      $summary.addEventListener('click', () => {
        $details.classList.toggle('open')
      }, false)
    })
  }

  /** Convert footnote refs into tooltip-enabled elements. */
  #initFootnotes() {
    const $footnoteRefs = document.querySelectorAll<HTMLElement>('#content sup[id^="fnref:"]')
    const $footnotes = document.querySelector<HTMLElement>('.footnotes[role="doc-endnotes"]')
    if (!$footnoteRefs.length || !$footnotes)
      return
    const footnoteMap = new Map<HTMLElement, HTMLElement>()
    $footnoteRefs.forEach(($ref) => {
      if (this.core.config.tooltip) {
        const $link = $ref.querySelector<HTMLAnchorElement>('a.footnote-ref')
        if ($link) {
          $link.addEventListener('click', (e) => {
            e.preventDefault()
          }, false)
        }
      }
      const id = $ref.id.replace('fnref:', '')
      const $footnoteContent = $footnotes.querySelector<HTMLElement>(`[id="fn:${id}"]`)
      if ($footnoteContent) {
        const $clonedContent = $footnoteContent.cloneNode(true) as HTMLElement
        const $backref = $clonedContent.querySelector('.footnote-backref')
        if ($backref)
          $backref.remove()
        footnoteMap.set($ref, $clonedContent)
      }
    })
    footnoteMap.forEach(($content, $ref) => {
      if ($ref.hasAttribute('title'))
        return
      $ref.setAttribute('title', $content.textContent!.trim())
      if (this.core.config.tooltip) {
        CellTooltip.getOrCreateInstance($ref)
      }
    })
  }

  /** Initialize CellTooltip on action buttons, copy buttons, and footnotes. */
  initTooltip() {
    if (!this.core.config.tooltip)
      return
    CellTooltip.initAll('li[data-task] > span[title]', { placement: 'right' })
    CellTooltip.initAll('.action-btn[title]', { placement: 'bottom' })
    CellTooltip.initAll('.copy-icon-btn[title]', { placement: 'top' })
    this.#initFootnotes()
  }

  /**
   * Re-initialize content components within a target element.
   * Useful after AJAX/pjax loads or dynamic content injection.
   * @param target - The root element to initialize components within.
   */
  initContent(target: Element | Document = document) {
    this.initDetails(target)
    this.code.initCodeWrapper()
    this.code.initCodeTabs()
    this.code.initDiagramCopyBtn()
    this.initTooltip()
    this.initLinkGuardDialog(target)
  }

  setup() {
    this.initContent()
    this.initSVGIcon()
    eventBus.on('fixit:decrypted', () => {
      this.initContent()
    })
    eventBus.on('fixit:partial-decrypted', ({ detail }) => {
      this.initContent(detail.target)
    })
  }
}