import type * as p from "@bokehjs/core/properties"
import {HTMLBox, HTMLBoxView} from "./layout"

const iconStarted = `<svg xmlns="http://www.w3.org/2000/svg" height="22px" style="vertical-align: middle;" fill="currentColor" class="bi bi-mic" viewBox="0 0 16 16">
  <path fill-rule="evenodd" d="M3.5 6.5A.5.5 0 0 1 4 7v1a4 4 0 0 0 8 0V7a.5.5 0 0 1 1 0v1a5 5 0 0 1-4.5 4.975V15h3a.5.5 0 0 1 0 1h-7a.5.5 0 0 1 0-1h3v-2.025A5 5 0 0 1 3 8V7a.5.5 0 0 1 .5-.5z"/>
  <path fill-rule="evenodd" d="M10 8V3a2 2 0 1 0-4 0v5a2 2 0 1 0 4 0zM8 0a3 3 0 0 0-3 3v5a3 3 0 0 0 6 0V3a3 3 0 0 0-3-3z"/>
</svg>`
const iconNotStarted = `<svg xmlns="http://www.w3.org/2000/svg" height="22px" style="vertical-align: middle;" fill="currentColor" class="bi bi-mic-mute" viewBox="0 0 16 16">
<path fill-rule="evenodd" d="M12.734 9.613A4.995 4.995 0 0 0 13 8V7a.5.5 0 0 0-1 0v1c0 .274-.027.54-.08.799l.814.814zm-2.522 1.72A4 4 0 0 1 4 8V7a.5.5 0 0 0-1 0v1a5 5 0 0 0 4.5 4.975V15h-3a.5.5 0 0 0 0 1h7a.5.5 0 0 0 0-1h-3v-2.025a4.973 4.973 0 0 0 2.43-.923l-.718-.719zM11 7.88V3a3 3 0 0 0-5.842-.963l.845.845A2 2 0 0 1 10 3v3.879l1 1zM8.738 9.86l.748.748A3 3 0 0 1 5 8V6.121l1 1V8a2 2 0 0 0 2.738 1.86zm4.908 3.494l-12-12 .708-.708 12 12-.708.707z"/>
</svg>`

const titleStarted = "Click to STOP the speech recognition."
const titleNotStarted = "Click to START the speech recognition."

// Hack inspired by https://stackoverflow.com/questions/38087013/angular2-web-speech-api-voice-recognition
interface IWindow extends Window {
  webkitSpeechRecognition: any
  webkitSpeechGrammarList: any
}
const {webkitSpeechRecognition}: IWindow = (window as unknown) as IWindow
const {webkitSpeechGrammarList}: IWindow = (window as unknown) as IWindow

function htmlToElement(html: string) {
  const template = document.createElement("template")
  html = html.trim() // Never return a text node of whitespace as the result
  template.innerHTML = html
  return template.content.firstChild as HTMLElement
}

function deserializeGrammars(grammars: any[]) {
  if (grammars) {
    const speechRecognitionList = new webkitSpeechGrammarList()
    for (const grammar of grammars) {
      if (grammar.src) {
        speechRecognitionList.addFromString(grammar.src, grammar.weight)
      } else if (grammar.uri) {
        speechRecognitionList.addFromURI(grammar.uri, grammar.weight)
      }
    }
    return speechRecognitionList
  } else {
    return null
  }
}

function round(value: number) {
  return Math.round((value + Number.EPSILON) * 100) / 100
}

function serializeResults(results_: any) {
  const results = []
  for (const result of results_) {
    const alternatives: { confidence: number, transcript: string }[] = []
    const item = {is_final: result.isFinal, alternatives}
    for (let i = 0; i < result.length; i++) {
      const alternative = {
        confidence: round(result[i].confidence),
        transcript: result[i].transcript,
      }
      alternatives.push(alternative)
    }
    item.alternatives = alternatives
    results.push(item)
  }
  return results
}

export class SpeechToTextView extends HTMLBoxView {
  declare model: SpeechToText

  recognition: any
  buttonEl: HTMLElement

  override initialize(): void {
    super.initialize()

    this.recognition = new webkitSpeechRecognition()
    this.recognition.lang = this.model.lang
    this.recognition.continuous = this.model.continuous
    this.recognition.interimResults = this.model.interim_results
    this.recognition.maxAlternatives = this.model.max_alternatives
    this.recognition.serviceURI = this.model.service_uri
    this.setGrammars()

    this.recognition.onresult = (event: any) => {
      this.model.results = serializeResults(event.results)
    }
    this.recognition.onerror = (event: any) => {
      console.error(`SpeechToText Error: ${event}`)
    }
    this.recognition.onnomatch = (event: any) => {
      console.warn(`SpeechToText No Match: ${event}`)
    }

    this.recognition.onaudiostart = () => this.model.audio_started = true
    this.recognition.onaudioend = () => this.model.audio_started = false
    this.recognition.onsoundstart = () => this.model.sound_started = true
    this.recognition.onsoundend = () => this.model.sound_started = false
    this.recognition.onspeechstart = () => this.model.speech_started=true
    this.recognition.onspeechend = () => this.model.speech_started=false
    this.recognition.onstart = () => {
      this.buttonEl.onclick = () => {
        this.recognition.stop()
      }
      this.buttonEl.innerHTML = this.iconStarted()
      this.buttonEl.setAttribute("title", titleStarted)
      this.model.started = true
    }
    this.recognition.onend = () => {
      this.buttonEl.onclick = () => {
        this.recognition.start()
      }
      this.buttonEl.innerHTML = this.iconNotStarted()
      this.buttonEl.setAttribute("title", titleNotStarted)
      this.model.started = false
    }

    this.buttonEl = htmlToElement(`<button class="bk bk-btn bk-btn-${this.model.button_type}" type="button" title="${titleNotStarted}"></button>`)
    this.buttonEl.innerHTML = this.iconNotStarted()
    this.buttonEl.onclick = () => this.recognition.start()
  }

  iconStarted(): string {
    if (this.model.button_started!=="") {
      return this.model.button_started
    } else {
      return iconStarted
    }
  }

  iconNotStarted(): string {
    if (this.model.button_not_started!=="") {
      return this.model.button_not_started
    } else {
      return iconNotStarted
    }
  }

  setIcon(): void {
    if (this.model.started) {
      this.buttonEl.innerHTML = this.iconStarted()
    } else {
      this.buttonEl.innerHTML = this.iconNotStarted()
    }
  }

  override connect_signals(): void {
    super.connect_signals()

    const {
      start, stop, abort, grammars, lang, continuous, interim_results, max_alternatives,
      service_uri, button_type, button_hide, button_not_started, button_started,
    } = this.model.properties

    this.on_change(start, () => {
      this.model.start = false
      this.recognition.start()
    })
    this.on_change(stop, () => {
      this.model.stop = false
      this.recognition.stop()
    })
    this.on_change(abort, () => {
      this.model.abort = false
      this.recognition.abort()
    })
    this.on_change(grammars, () => this.setGrammars())
    this.on_change(lang, () => this.recognition.lang = this.model.lang)
    this.on_change(continuous, () => this.recognition.continuous = this.model.continuous)
    this.on_change(interim_results, () => this.recognition.interimResults = this.model.interim_results)
    this.on_change(max_alternatives, () => this.recognition.maxAlternatives = this.model.max_alternatives)
    this.on_change(service_uri, () => this.recognition.serviceURI = this.model.service_uri)
    this.on_change(button_type, () => this.buttonEl.className = `bk bk-btn bk-btn-${this.model.button_type}`)
    this.on_change(button_hide, () => this.render())
    this.on_change([button_not_started, button_started], () => this.setIcon())
  }

  setGrammars(): void {
    this.recognition.grammars = deserializeGrammars(this.model.grammars)
  }

  override render(): void {
    super.render()
    if (!this.model.button_hide) {
      this.shadow_el.appendChild(this.buttonEl)
    }
  }
}

export namespace SpeechToText {
  export type Attrs = p.AttrsOf<Props>
  export type Props = HTMLBox.Props & {
    start: p.Property<boolean>
    stop: p.Property<boolean>
    abort: p.Property<boolean>
    grammars: p.Property<any[]>
    lang: p.Property<string>
    continuous: p.Property<boolean>
    interim_results: p.Property<boolean>
    max_alternatives: p.Property<number>
    service_uri: p.Property<string>
    started: p.Property<boolean>
    audio_started: p.Property<boolean>
    sound_started: p.Property<boolean>
    speech_started: p.Property<boolean>
    button_type: p.Property<string>
    button_hide: p.Property<boolean>
    button_not_started: p.Property<string>
    button_started: p.Property<string>
    results: p.Property<any[]>
  }
}

export interface SpeechToText extends SpeechToText.Attrs {}

export class SpeechToText extends HTMLBox {
  declare properties: SpeechToText.Props

  constructor(attrs?: Partial<SpeechToText.Attrs>) {
    super(attrs)
  }

  static override __module__ = "panel.models.speech_to_text"

  static {
    this.prototype.default_view = SpeechToTextView

    this.define<SpeechToText.Props>(({Any, List, Bool, Float, Str}) => ({
      start: [ Bool, false ],
      stop: [ Bool, false ],
      abort: [ Bool, false ],
      grammars: [ List(Any), [] ],
      lang: [ Str, "" ],
      continuous: [ Bool,   false ],
      interim_results: [ Bool,   false ],
      max_alternatives: [ Float,   1 ],
      service_uri: [ Str, "" ],
      started: [ Bool,   false ],
      audio_started: [ Bool,   false ],
      sound_started: [ Bool,   false ],
      speech_started: [ Bool,   false ],
      button_type: [ Str, "light" ],
      button_hide: [ Bool,   false ],
      button_not_started: [ Str,   "" ],
      button_started: [ Str,   "" ],
      results: [ List(Any), [] ],
    }))
  }
}