/*
 * libmedia AudioWorkletNodeBase
 *
 * 版权所有 (C) 2024 赵高兴
 * Copyright (C) 2024 Gaoxing Zhao
 *
 * 此文件是 libmedia 的一部分
 * This file is part of libmedia.
 * 
 * libmedia 是自由软件；您可以根据 GNU Lesser General Public License（GNU LGPL）3.1
 * 或任何其更新的版本条款重新分发或修改它
 * libmedia is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.1 of the License, or (at your option) any later version.
 * 
 * libmedia 希望能够为您提供帮助，但不提供任何明示或暗示的担保，包括但不限于适销性或特定用途的保证
 * 您应自行承担使用 libmedia 的风险，并且需要遵守 GNU Lesser General Public License 中的条款和条件。
 * libmedia is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 */

import {
  type Data,
  is
} from '@libmedia/common'

import {
  type RpcMessage,
  IPCPort,
  NOTIFY
} from '@libmedia/common/network'

export interface AudioWorkletNodeObserver {
  onEnded: () => void
  onFirstRendered: () => void
  onStutter: () => void
}

export default class AudioWorkletNodeBase {

  protected audioWorkletNode: AudioWorkletNode

  protected ipcPort: IPCPort

  protected observer: AudioWorkletNodeObserver

  constructor(context: AudioContext, observer: AudioWorkletNodeObserver, processor: string, options: AudioWorkletNodeOptions = {}) {
    this.observer = observer
    this.audioWorkletNode = new AudioWorkletNode(context, processor, options)
    this.ipcPort = new IPCPort(this.audioWorkletNode.port)

    this.ipcPort.on(NOTIFY, (request: RpcMessage) => {
      switch (request.method) {
        case 'ended':
          this.observer.onEnded()
          break
        case 'firstRendered':
          this.observer.onFirstRendered()
          break
        case 'stutter':
          this.observer.onStutter()
          break
      }
    })
  }

  public async request(method: string, params?: Data, transfer?: any[]) {
    return this.ipcPort.request(method, params, transfer)
  }

  public connect(audioNode: AudioNode) {
    this.audioWorkletNode.connect(audioNode)
  }

  public getNode(): AudioNode {
    return this.audioWorkletNode
  }

  public disconnect() {
    this.audioWorkletNode.disconnect()
  }

  public getParameters(type: string): AudioParam {
    const parameters = this.audioWorkletNode.parameters
    if (is.func(parameters.get)) {
      return parameters.get(type)
    }
    parameters.forEach((value, key) => {
      if (key === type) {
        return value
      }
    })
  }
}