let audio: HTMLAudioElement | null = null
let audioContext: AudioContext
let mediaSource: MediaElementAudioSourceNode
let analyser: AnalyserNode

export const createAudio = () => {
  if (audio) return
  audio = new window.Audio()
  audio.controls = false
  audio.autoplay = true
  audio.preload = 'auto'
}

export const getAnalyser = (): AnalyserNode | null => {
  if (!audio) throw new Error('audio not defined')

  if (audioContext == null) {
    audioContext = new window.AudioContext()
    mediaSource = audioContext.createMediaElementSource(audio)
    analyser = audioContext.createAnalyser()
    analyser.fftSize = 256
    mediaSource.connect(analyser)
    analyser.connect(audioContext.destination)
  }
  return analyser
}

export const hasInitedAnalyser = (): boolean => audioContext != null

export const setResource = (src: string) => {
  if (audio) audio.src = src
}

export const setPlay = () => {
  void audio?.play()
}

export const setPause = () => {
  audio?.pause()
}

export const setStop = () => {
  if (audio) {
    audio.src = ''
    audio.removeAttribute('src')
  }
}

export const isEmpty = (): boolean => !audio?.src

export const setLoopPlay = (isLoop: boolean) => {
  if (audio) audio.loop = isLoop
}

export const getPlaybackRate = (): number => {
  return audio?.defaultPlaybackRate ?? 1
}

export const setPlaybackRate = (rate: number) => {
  if (!audio) return
  audio.defaultPlaybackRate = rate
  audio.playbackRate = rate
}

export const getMute = (): boolean => {
  return audio?.muted ?? false
}

export const setMute = (isMute: boolean) => {
  if (audio) audio.muted = isMute
}

export const getCurrentTime = () => {
  return audio?.currentTime ?? 0
}

export const setCurrentTime = (time: number) => {
  if (audio) audio.currentTime = time
}

export const setMediaDeviceId = (mediaDeviceId: string) => {
  // @ts-expect-error
  return audio ? audio.setSinkId(mediaDeviceId) : Promise.resolve()
}

export const setVolume = (volume: number) => {
  if (audio) audio.volume = volume
}

export const getDuration = () => {
  return audio?.duration ?? 0
}

// export const getPlaybackRate = () => {
//   return audio?.playbackRate ?? 1
// }

type Noop = () => void

export const onPlaying = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('playing', callback)
  return () => {
    audio?.removeEventListener('playing', callback)
  }
}

export const onPause = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio?.addEventListener('pause', callback)
  return () => {
    audio?.removeEventListener('pause', callback)
  }
}

export const onEnded = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('ended', callback)
  return () => {
    audio?.removeEventListener('ended', callback)
  }
}

export const onError = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('error', callback)
  return () => {
    audio?.removeEventListener('error', callback)
  }
}

export const onLoadeddata = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('loadeddata', callback)
  return () => {
    audio?.removeEventListener('loadeddata', callback)
  }
}

export const onLoadstart = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('loadstart', callback)
  return () => {
    audio?.removeEventListener('loadstart', callback)
  }
}

export const onCanplay = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('canplay', callback)
  return () => {
    audio?.removeEventListener('canplay', callback)
  }
}

export const onEmptied = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('emptied', callback)
  return () => {
    audio?.removeEventListener('emptied', callback)
  }
}

export const onTimeupdate = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('timeupdate', callback)
  return () => {
    audio?.removeEventListener('timeupdate', callback)
  }
}

// 缓冲中
export const onWaiting = (callback: Noop) => {
  if (!audio) throw new Error('audio not defined')

  audio.addEventListener('waiting', callback)
  return () => {
    audio?.removeEventListener('waiting', callback)
  }
}

// 可见性改变
export const onVisibilityChange = (callback: Noop) => {
  document.addEventListener('visibilitychange', callback)
  return () => {
    document.removeEventListener('visibilitychange', callback)
  }
}


export const getErrorCode = () => {
  return audio?.error?.code
}