/*
 * libmedia mp4 mdhd 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, IsobmffStreamContext } from '../type'
import { BoxType } from '../boxType'
import getSampleDuration from '../function/getSampleDuration'
import { is } from '@libmedia/common'
import { type IOWriterSync } from '@libmedia/common/io'
import { UINT32_MAX } from '@libmedia/avutil/internal'
import { AVStreamMetadataKey, type AVStream } from '@libmedia/avutil'

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

  const streamContext = stream.privData as IsobmffStreamContext

  const duration = getSampleDuration(streamContext)

  const creationTime = stream.metadata[AVStreamMetadataKey.CREATION_TIME] || 0
  const modificationTime = stream.metadata[AVStreamMetadataKey.MODIFICATION_TIME] || 0
  let language = 21956
  let lang = stream.metadata[AVStreamMetadataKey.LANGUAGE]
  if (lang && is.string(lang) && lang.length >= 3) {
    language = (((lang.charCodeAt(0) - 0x60) & 0x1f) << 10)
      | (((lang.charCodeAt(1) - 0x60) & 0x1f) << 5)
      | (((lang.charCodeAt(2) - 0x60) & 0x1f))
  }

  let version = duration < static_cast<int64>(UINT32_MAX) ? 0 : 1
  version = creationTime < UINT32_MAX ? 0 : 1
  version = modificationTime < UINT32_MAX ? 0 : 1

  // size
  ioWriter.writeUint32(version === 1 ? 44 : 32)
  // tag
  ioWriter.writeString(BoxType.MDHD)

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

  if (version === 1) {
    ioWriter.writeUint64(static_cast<int64>(creationTime))
    ioWriter.writeUint64(static_cast<int64>(modificationTime))
  }
  else {
    ioWriter.writeUint32(Number(creationTime))
    ioWriter.writeUint32(Number(modificationTime))
  }

  // timescale
  ioWriter.writeUint32(stream.timeBase.den)

  if (version === 1) {
    ioWriter.writeUint64(duration)
  }
  else {
    ioWriter.writeUint32(Number(duration))
  }

  // language
  ioWriter.writeUint16(language)
  // reserved (quality) 
  ioWriter.writeUint16(0)
}