import type { Ctx } from '@milkdown/ctx'
import type { Mark } from '@milkdown/prose/model'
import type { PluginView } from '@milkdown/prose/state'
import type { EditorView } from '@milkdown/prose/view'

import { editorViewCtx } from '@milkdown/core'
import { TooltipProvider } from '@milkdown/plugin-tooltip'
import { linkSchema } from '@milkdown/preset-commonmark'
import { posToDOMRect } from '@milkdown/prose'
import { TextSelection } from '@milkdown/prose/state'
import DOMPurify from 'dompurify'
import { createApp, ref, type App, type Ref } from 'vue'

import {
  linkTooltipConfig,
  linkTooltipState,
  type LinkTooltipConfig,
} from '../slices'
import { EditLink } from './component'

interface Data {
  from: number
  to: number
  mark: Mark | null
}

const defaultData: Data = {
  from: -1,
  to: -1,
  mark: null,
}

export class LinkEditTooltip implements PluginView {
  #content: HTMLElement
  #provider: TooltipProvider
  #data: Data = { ...defaultData }
  #app: App
  #config: Ref<LinkTooltipConfig>
  #src = ref('')

  constructor(
    readonly ctx: Ctx,
    view: EditorView
  ) {
    this.#config = ref(this.ctx.get(linkTooltipConfig.key))

    const content = document.createElement('div')
    content.className = 'milkdown-link-edit'

    const app = createApp(EditLink, {
      config: this.#config,
      src: this.#src,
      onConfirm: this.#confirmEdit,
      onCancel: this.#reset,
    })
    app.mount(content)
    this.#app = app

    this.#content = content
    this.#provider = new TooltipProvider({
      content,
      debounce: 0,
      shouldShow: () => false,
    })
    this.#provider.onHide = () => {
      requestAnimationFrame(() => {
        view.dom.focus({ preventScroll: true })
      })
    }
    this.#provider.update(view)
  }

  #reset = () => {
    this.#provider.hide()
    this.ctx.update(linkTooltipState.key, (state) => ({
      ...state,
      mode: 'preview' as const,
    }))
    this.#data = { ...defaultData }
  }

  #confirmEdit = (href: string) => {
    const view = this.ctx.get(editorViewCtx)
    const { from, to, mark } = this.#data
    const type = linkSchema.type(this.ctx)
    const link = DOMPurify.sanitize(href)
    if (mark && mark.attrs.href === link) {
      this.#reset()
      return
    }

    const tr = view.state.tr
    if (mark) tr.removeMark(from, to, mark)

    tr.addMark(from, to, type.create({ href: link }))
    view.dispatch(tr)

    this.#reset()
  }

  #enterEditMode = (value: string, from: number, to: number) => {
    const config = this.ctx.get(linkTooltipConfig.key)
    this.#config.value = config
    this.#src.value = value
    this.ctx.update(linkTooltipState.key, (state) => ({
      ...state,
      mode: 'edit' as const,
    }))
    const view = this.ctx.get(editorViewCtx)
    view.dispatch(
      view.state.tr.setSelection(TextSelection.create(view.state.doc, from, to))
    )
    this.#provider.show(
      { getBoundingClientRect: () => posToDOMRect(view, from, to) },
      view
    )
    requestAnimationFrame(() => {
      this.#content.querySelector('input')?.focus()
    })
  }

  update = (view: EditorView) => {
    const { state } = view
    const { selection } = state
    if (!(selection instanceof TextSelection)) return
    const { from, to } = selection
    if (from === this.#data.from && to === this.#data.to) return

    this.#reset()
  }

  destroy = () => {
    this.#app.unmount()
    this.#provider.destroy()
    this.#content.remove()
  }

  addLink = (from: number, to: number) => {
    this.#data = {
      from,
      to,
      mark: null,
    }
    this.#enterEditMode('', from, to)
  }

  editLink = (mark: Mark, from: number, to: number) => {
    this.#data = {
      from,
      to,
      mark,
    }
    this.#enterEditMode(mark.attrs.href, from, to)
  }

  removeLink = (from: number, to: number) => {
    const view = this.ctx.get(editorViewCtx)

    const tr = view.state.tr
    tr.removeMark(from, to, linkSchema.type(this.ctx))
    view.dispatch(tr)

    this.#reset()
  }
}