/*
 * libmedia mp4 hdlr box write
 *
 * 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 { IsobmffContext } from '../type'
import { BoxType } from '../boxType'
import { type IOWriterSync } from '@libmedia/common/io'
import { AVMediaType, type AVStream, AVStreamMetadataKey } from '@libmedia/avutil'

export default function write(ioWriter: IOWriterSync, stream: AVStream, isobmffContext: IsobmffContext) {

  const pos = ioWriter.getPos()
  // size
  ioWriter.writeUint32(0)
  // tag
  ioWriter.writeString(BoxType.HDLR)

  // version
  ioWriter.writeUint8(0)
  // flags
  ioWriter.writeUint24(0)

  let hdlr = 'dhlr'
  let hdlrType = 'url '
  let descr = 'DataHandler'

  if (stream) {
    hdlr = 'mhlr'
    if (stream.codecpar.codecType === AVMediaType.AVMEDIA_TYPE_AUDIO) {
      hdlrType = 'soun'
      descr = 'SoundHandler'
    }
    else if (stream.codecpar.codecType === AVMediaType.AVMEDIA_TYPE_VIDEO) {
      hdlrType = 'vide'
      descr = 'VideoHandler'
    }
    else if (stream.codecpar.codecType === AVMediaType.AVMEDIA_TYPE_SUBTITLE) {
      hdlrType = 'text'
      descr = 'SubtitleHandler'
    }
    else {
      if (stream.metadata[AVStreamMetadataKey.HANDLER_NAME]) {
        descr = stream.metadata[AVStreamMetadataKey.HANDLER_NAME]
      }
      if (stream.metadata['hdlrType']) {
        hdlrType = stream.metadata['hdlrType']
      }
    }
  }

  // handler
  ioWriter.writeString(hdlr)
  // handler type 
  ioWriter.writeString(hdlrType)

  // reserved
  ioWriter.writeUint32(0)
  ioWriter.writeUint32(0)
  ioWriter.writeUint32(0)

  if (!stream || isobmffContext.isom) {
    ioWriter.writeUint8(descr.length)
  }

  ioWriter.writeString(descr)

  if (stream && !isobmffContext.isom) {
    // c string
    ioWriter.writeUint8(0)
  }

  isobmffContext.boxsPositionInfo.push({
    pos,
    type: BoxType.HDLR,
    size: Number(ioWriter.getPos() - pos)
  })
}