'use client'

import {
  ClapAssetSource,
  ClapEntity,
  ClapProject,
  ClapSegmentCategory,
  ClapSegmentStatus,
  getClapAssetSourceType,
  newClap,
  newSegment,
  parseClap,
  serializeClap,
} from '@aitube/clap'
import {
  TimelineStore,
  useTimeline,
  TimelineSegment,
  removeFinalVideosAndConvertToTimelineSegments,
  getFinalVideo,
} from '@aitube/timeline'
import { ParseScriptProgressUpdate, parseScriptToClap } from '@aitube/broadway'
import { IOStore, TaskCategory, TaskVisibility } from '@aitube/clapper-services'
import { create } from 'zustand'
import * as fflate from 'fflate'

import { getDefaultIOState } from './getDefaultIOState'

import { blobToBase64DataUri } from '@/lib/utils/blobToBase64DataUri'
import { parseFileIntoSegments } from './parseFileIntoSegments'
import { useTasks } from '@/components/tasks/useTasks'

import { parseFileName } from './parseFileName'
import { useRenderer } from '../renderer'
import { base64DataUriToUint8Array } from '@/lib/utils/base64DataUriToUint8Array'

import { formatDuration } from '@/lib/utils/formatDuration'
import {
  ExportableSegment,
  formatSegmentForExport,
} from '@/lib/utils/formatSegmentForExport'
import { sleep } from '@/lib/utils/sleep'
import {
  FFMPegAudioInput,
  FFMPegVideoInput,
  createFullVideo,
} from './createFullVideo'

export const useIO = create<IOStore>((set, get) => ({
  ...getDefaultIOState(),

  clear: () => {
    const renderer = useRenderer.getState()
    const timeline: TimelineStore = useTimeline.getState()

    // reset various things
    renderer.clear()
    timeline.clear()
  },
  openFiles: async (files: File[]) => {
    const { openClapBlob, openScreenplay } = get()
    const timeline: TimelineStore = useTimeline.getState()
    const { segments, addSegments } = timeline

    if (Array.isArray(files)) {
      console.log('user tried to drop some files:', files)

      // for now let's simplify things, and only import the first file
      const file: File | undefined = files.at(0)
      if (!file) {
        return
      }

      const input = `${file.name || ''}`
      const { fileName, projectName, extension } = parseFileName(input)

      const fileType = `${file.type || ''}`

      console.log(`file type: ${fileType}`)

      const isClapFile = extension === 'clap'

      if (isClapFile) {
        await openClapBlob(projectName, fileName, file)
        return
      }

      const isTextFile = fileType.startsWith('text/')
      if (isTextFile) {
        await openScreenplay(projectName, fileName, file)
        return
      }

      const isAudioFile = fileType.startsWith('audio/')

      // TODO: detect the type of file, and do a different treatment based on this
      // screenplay files: -> analyze (if there is existing data, show a modal asking to save or not)
      // mp3 file: ->
      if (isAudioFile) {
        const newSegments = await parseFileIntoSegments({ file })

        console.log('calling  timeline.addSegments with:', newSegments)
        await timeline.addSegments({
          segments: newSegments,
        })
        return
      }

      const isVideoFile = fileType.startsWith('video/')
    }
  },
  openScreenplay: async (
    projectName: string,
    fileName: string,
    fileContent: string | Blob
  ): Promise<void> => {
    const plainText =
      typeof fileContent === 'string'
        ? fileContent
        : await new Response(fileContent).text()

    const timeline: TimelineStore = useTimeline.getState()
    const task = useTasks.getState().add({
      category: TaskCategory.IMPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Loading ${fileName}`,
      successMessage: `Successfully loaded the screenplay!`,
      value: 0,
    })
    task.setProgress({
      message: 'Analyzing screenplay..',
      value: 10,
    })

    try {
      // this is the old way, based on a call to a separate API hosted on HF
      // obviously this wasn't very practical and easy to scale, so I'm dropping it
      //
      // const res = await fetch("https://jbilcke-hf-broadway-api.hf.space", {
      //   method: "POST",
      //   headers: { 'Content-Type': 'text/plain' },
      //   body: plainText,
      // })
      // const blob = await res.blob()
      // task.setProgress({
      //   message: "Loading scenes..",
      //   value: 50
      // })
      // const clap = await parseClap(blob)

      // new way: we analyze the screenplay on browser side
      const clap = await parseScriptToClap(
        plainText,
        async ({ value, sleepDelay, message }) => {
          const relativeProgressRatio = value / 100
          const totalProgress = 10 + relativeProgressRatio * 80
          task.setProgress({
            message,
            value: totalProgress,
          })
          await sleep(sleepDelay || 25)
        }
      )

      clap.meta.title = `${projectName || ''}`

      task.setProgress({
        message: 'Loading rendering engine..',
        value: 90,
      })

      await timeline.setClap(clap)

      task.setProgress({
        message: 'Nearly there..',
        value: 98,
      })

      task.success()
    } catch (err) {
      console.error('failed to import the screenplay:', err)
      task.fail(`${err || 'unknown screenplay import error'}`)
    } finally {
    }
  },
  openScreenplayUrl: async (url: string) => {
    const timeline: TimelineStore = useTimeline.getState()

    const { fileName, projectName } = parseFileName(
      `${url.split('/').pop() || url}`
    )

    const task = useTasks.getState().add({
      category: TaskCategory.IMPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Loading ${fileName}`,
      successMessage: `Successfully downloaded the screenplay!`,
      value: 0,
    })

    task.setProgress({
      message: 'Downloading screenplay..',
      value: 10,
    })

    try {
      const res = await fetch(url)
      const plainText = await res.text()
      // new way: we analyze the screenplay on browser side
      const clap = await parseScriptToClap(
        plainText,
        async ({ value, sleepDelay, message }) => {
          const relativeProgressRatio = value / 100
          const totalProgress = 10 + relativeProgressRatio * 80
          task.setProgress({
            message,
            value: totalProgress,
          })
          await sleep(sleepDelay || 25)
        }
      )

      clap.meta.title = `${projectName || ''}`

      task.setProgress({
        message: 'Loading rendering engine..',
        value: 90,
      })

      await timeline.setClap(clap)

      task.setProgress({
        message: 'Nearly there..',
        value: 98,
      })

      task.success()
    } catch (err) {
      task.fail(`${err || 'unknown error'}`)
    }
  },
  saveAnyFile: (blob: Blob, fileName: string) => {
    // Create an object URL for the compressed clap blob
    // object urls are short-lived urls, with the benefit of having a short id too

    const objectUrl = URL.createObjectURL(blob)

    // Create an anchor element and force browser download
    const anchor = document.createElement('a')
    anchor.href = objectUrl

    anchor.download = fileName

    document.body.appendChild(anchor) // Append to the body (could be removed once clicked)
    anchor.click() // Trigger the download

    // Cleanup: revoke the object URL and remove the anchor element
    URL.revokeObjectURL(objectUrl)
    document.body.removeChild(anchor)
  },

  openClapUrl: async (url: string) => {
    const timeline: TimelineStore = useTimeline.getState()
    const { setClap } = timeline

    const { fileName, projectName } = parseFileName(
      `${url.split('/').pop() || url}`
    )

    const task = useTasks.getState().add({
      category: TaskCategory.IMPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Loading ${fileName}`,
      successMessage: `Successfully downloaded the project!`,
      value: 0,
    })

    task.setProgress({
      message: 'Downloading file..',
      value: 10,
    })

    try {
      const res = await fetch(url)
      const blob = await res.blob()

      task.setProgress({
        message: 'Loading scenes..',
        value: 30,
      })

      const clap = await parseClap(blob)
      clap.meta.title = `${projectName}`

      task.setProgress({
        message: 'Loading rendering engine..',
        value: 70,
      })

      await setClap(clap)

      task.success()
    } catch (err) {
      task.fail(`${err || 'unknown error'}`)
    }
  },
  openClapBlob: async (projectName: string, fileName: string, blob: Blob) => {
    const timeline: TimelineStore = useTimeline.getState()
    const { setClap } = timeline

    const task = useTasks.getState().add({
      category: TaskCategory.IMPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Loading ${fileName}`,
      successMessage: `Successfully loaded the project!`,
      value: 0,
    })
    try {
      task.setProgress({
        message: 'Loading scenes..',
        value: 30,
      })

      const clap = await parseClap(blob)
      clap.meta.title = `${projectName}`

      task.setProgress({
        message: 'Loading rendering engine..',
        value: 70,
      })

      await setClap(clap)

      task.success()
    } catch (err) {
      task.fail(`${err || 'unknown error'}`)
    }
  },
  saveClap: async () => {
    const { saveAnyFile } = get()
    const { clap, entities, entityIndex } = useTimeline.getState()

    if (!clap) {
      throw new Error(`cannot save a clap.. if there is no clap`)
    }

    const tasks = useTasks.getState()

    const task = tasks.add({
      category: TaskCategory.EXPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Exporting project to OpenClap..`,
      successMessage: `Successfully exported the project!`,
      // mode: "percentage", // default
      // min: 0, // default
      // max: 100 // default
    })

    // make sure we update the total duration
    for (const s of clap.segments) {
      if (s.endTimeInMs > clap.meta.durationInMs) {
        clap.meta.durationInMs = s.endTimeInMs
      }
    }

    // update the clap with the in-memory versions of the entities
    clap.entities = entities
    clap.entityIndex = entityIndex

    // TODO: serializeClap should have a progress callback, so that we can
    // track the progression.
    //
    // also, I'm 100% aware that at some point we will just want to use the
    // desktop version of Clapper, so that we can write the gzip stream directly to the disk
    const blob: Blob = await serializeClap(clap)
    saveAnyFile(blob, `my_project.clap`) // <-- TODO use the project filename

    task.success()
  },

  saveVideoFile: async () => {
    const { saveAnyFile } = get()
    console.log(`rendering project using the free community server..`)

    const timeline: TimelineStore = useTimeline.getState()

    const { clap, totalDurationInMs, segments: timelineSegments } = timeline

    const task = useTasks.getState().add({
      category: TaskCategory.EXPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Rendering the project to MP4..`,
      successMessage: `Successfully exported the MP4 video!`,
      value: 0,
    })

    const ignoreThisVideoSegmentId = (await getFinalVideo(clap))?.id || ''

    const segments: ExportableSegment[] = timelineSegments
      .map((segment, i) => formatSegmentForExport(segment, i))
      .filter(
        ({ id, isExportableToFile }) =>
          isExportableToFile && id !== ignoreThisVideoSegmentId
      )

    console.log('segments:', segments)

    const videos: FFMPegVideoInput[] = []
    const audios: FFMPegAudioInput[] = []

    segments.forEach(
      ({
        segment,
        prefix,
        filePath,
        assetUrl,
        assetSourceType,
        isExportableToFile,
      }) => {
        // we extract the base64 files
        if (isExportableToFile) {
          assetUrl = filePath
          assetSourceType = ClapAssetSource.PATH

          if (filePath.startsWith('video/')) {
            console.log('adding video')
            videos.push({
              data: base64DataUriToUint8Array(segment.assetUrl),
              startTimeInMs: segment.startTimeInMs,
              endTimeInMs: segment.endTimeInMs,
              durationInSecs: segment.assetDurationInMs / 1000,
            })
          }

          if (
            filePath.startsWith('music/') ||
            filePath.startsWith('sound/') ||
            filePath.startsWith('dialogue/')
          ) {
            console.log('adding audio')
            audios.push({
              data: base64DataUriToUint8Array(segment.assetUrl),
              startTimeInMs: segment.startTimeInMs,
              endTimeInMs: segment.endTimeInMs,
              durationInSecs: segment.assetDurationInMs / 1000,
            })
          }
        }
      }
    )

    const fullVideo = await createFullVideo(
      videos,
      audios,
      1024,
      576,
      totalDurationInMs,
      (progress, message) => {
        task.setProgress({
          message: `Rendering video (${Math.round(progress)}%)`,
          value: progress * 0.9,
        })
      }
    )

    const videoBlob = new Blob([fullVideo], { type: 'video/mp4' })

    const videoDataUrl = await blobToBase64DataUri(videoBlob)

    const alreadyAnEmbeddedFinalVideo = timelineSegments
      .filter(
        (s) =>
          s.category === ClapSegmentCategory.VIDEO &&
          s.status === ClapSegmentStatus.COMPLETED &&
          s.startTimeInMs === 0 &&
          s.endTimeInMs === clap.meta.durationInMs &&
          s.assetUrl
      )
      .at(0)

    // inject the final mp4 video file into the .clap
    if (alreadyAnEmbeddedFinalVideo) {
      console.log(`editing the clap to update the final video`)
      alreadyAnEmbeddedFinalVideo.assetUrl = videoDataUrl
    } else {
      console.log(`editing the clap to add a new final video`)
      clap.segments.push(
        newSegment({
          category: ClapSegmentCategory.VIDEO,
          status: ClapSegmentStatus.COMPLETED,
          startTimeInMs: 0,
          endTimeInMs: clap.meta.durationInMs,
          assetUrl: videoDataUrl,
          assetDurationInMs: clap.meta.durationInMs,
          assetSourceType: getClapAssetSourceType(videoDataUrl),
          outputGain: 1.0,
        })
      )
    }

    task.success()

    saveAnyFile(videoBlob, 'my_project.mp4')
  },

  saveZipFile: async () => {
    const { saveAnyFile, generateMLT } = get()
    console.log(`exporting project to ZIP..`)

    const task = useTasks.getState().add({
      category: TaskCategory.EXPORT,
      visibility: TaskVisibility.BLOCKER,
      initialMessage: `Exporting project to ZIP..`,
      successMessage: `Successfully exported the project!`,
      value: 0,
    })

    try {
      const timeline: TimelineStore = useTimeline.getState()
      const { clap, segments: timelineSegments } = timeline
      const segments: ExportableSegment[] = timelineSegments
        .map((segment, i) => formatSegmentForExport(segment, i))
        .filter(({ isExportableToFile }) => isExportableToFile)

      let files: fflate.AsyncZippable = {}

      files['screenplay.txt'] = fflate.strToU8(clap.meta.screenplay)

      files['meta.json'] = fflate.strToU8(JSON.stringify(clap.meta, null, 2))

      const shotcutMltXml = await generateMLT()
      files['shotcut_project.mlt'] = fflate.strToU8(shotcutMltXml)

      const videos: FFMPegVideoInput[] = []
      const audios: FFMPegAudioInput[] = []

      const includeFullVideo = false

      segments.forEach(
        ({
          segment,
          prefix,
          filePath,
          assetUrl,
          assetSourceType,
          isExportableToFile,
        }) => {
          // we extract the base64 files
          if (isExportableToFile) {
            files[filePath] = [
              // we don't compress assets since normally they already use
              // some form of compression (PNG, JPEG, MP3, MP4 etc..)
              base64DataUriToUint8Array(segment.assetUrl),
              { level: 0 },
            ]
            assetUrl = filePath
            assetSourceType = ClapAssetSource.PATH

            if (includeFullVideo) {
              if (filePath.startsWith('video/')) {
                videos.push({
                  data: base64DataUriToUint8Array(segment.assetUrl),
                  startTimeInMs: segment.startTimeInMs,
                  endTimeInMs: segment.endTimeInMs,
                  durationInSecs: segment.assetDurationInMs / 1000,
                })
              }

              if (
                filePath.startsWith('music/') ||
                filePath.startsWith('dialogue/')
              ) {
                audios.push({
                  data: base64DataUriToUint8Array(segment.assetUrl),
                  startTimeInMs: segment.startTimeInMs,
                  endTimeInMs: segment.endTimeInMs,
                  durationInSecs: segment.assetDurationInMs / 1000,
                })
              }
            }
          }

          // segment metadata
          files[`segments/${prefix}${segment.id}.json`] = fflate.strToU8(
            JSON.stringify(
              {
                ...segment,
                assetUrl,
                assetSourceType,
              },
              null,
              2
            )
          )
        }
      )

      if (includeFullVideo) {
        const fullVideo = await createFullVideo(
          videos,
          audios,
          clap.meta.width,
          clap.meta.height,
          timeline.totalDurationInMs,
          (progress, message) => {
            task.setProgress({
              message,
              value: progress * 0.9,
            })
          }
        )

        files['video/full.mp4'] = [
          // we don't compress assets since normally they already use
          // some form of compression (PNG, JPEG, MP3, MP4 etc..)
          fullVideo as Uint8Array,
          { level: 0 },
        ]
      }

      fflate.zip(
        files,
        {
          // options
        },
        (error, zipFile) => {
          task.setProgress({
            message: 'Saving to file..',
            value: 100,
          })
          saveAnyFile(new Blob([zipFile]), 'my_project.zip')
          task.success()
        }
      )
    } catch (err) {
      console.error(err)
      task.fail(`${err || 'unknown error'}`)
    }
  },

  openMLT: async (file: File) => {},
  saveMLT: async () => {},
  generateMLT: async (): Promise<string> => {
    const timeline: TimelineStore = useTimeline.getState()
    const { clap, segments: timelineSegments } = timeline

    const segments: ExportableSegment[] = timelineSegments
      .map((segment, i) => formatSegmentForExport(segment, i))
      .filter(({ isExportableToFile }) => isExportableToFile)

    const videos: ExportableSegment[] = segments.filter(
      ({ segment }) => segment.category === ClapSegmentCategory.VIDEO
    )

    const storyboards: ExportableSegment[] = segments.filter(
      ({ segment }) => segment.category === ClapSegmentCategory.STORYBOARD
    )

    const dialogues: ExportableSegment[] = segments.filter(
      ({ segment }) => segment.category === ClapSegmentCategory.DIALOGUE
    )

    const sounds: ExportableSegment[] = segments.filter(
      ({ segment }) => segment.category === ClapSegmentCategory.SOUND
    )

    const music: ExportableSegment[] = segments.filter(
      ({ segment }) => segment.category === ClapSegmentCategory.MUSIC
    )

    // want to see some colors? install es6-string-html in your VSCode
    return /* HTML*/ `<?xml version="1.0" standalone="no"?>
<mlt LC_NUMERIC="C" version="7.24.0" title="${clap.meta.title}" producer="main_bin">
  <profile
    description="${clap.meta.width}:${clap.meta.height}"
    width="${clap.meta.width}"
    height="${clap.meta.height}"
    progressive="0"
    sample_aspect_num="1"
    sample_aspect_den="1"
    display_aspect_num="16"
    display_aspect_den="9"

    ${
      ''
      // a good reminder we should add a feature to keep track of the FPS in Clapper
    }
    frame_rate_num="25"
    frame_rate_den="1"
    colorspace="709"
  />
  <playlist id="main_bin">
    <property name="xml_retain">1</property>
  </playlist>
  <producer id="black" in="00:00:00.000" out="${formatDuration(clap.meta.durationInMs)}">
    <property name="length">${formatDuration(clap.meta.durationInMs)}</property>
    <property name="eof">pause</property>
    <property name="resource">0</property>
    <property name="aspect_ratio">1</property>
    <property name="mlt_service">color</property>
    <property name="mlt_image_format">rgba</property>
    <property name="set.test_audio">0</property>
  </producer>
  <playlist id="background">
    <entry producer="black" in="00:00:00.000" out="${formatDuration(clap.meta.durationInMs)}" />
  </playlist>
  ${segments
    .map(
      ({ segment, shortId, fileName, filePath, index }) => /* HTML*/ `
  <producer
    id="${shortId}"
    in="${formatDuration(0)}"
    out="${formatDuration(clap.meta.durationInMs)}">
    <property name="length">${formatDuration(clap.meta.durationInMs)}</property>
    <property name="eof">pause</property>
    <property name="resource">${filePath}</property>
    <property name="ttl">1</property>
    <property name="aspect_ratio">1</property>
    <property name="meta.media.progressive">1</property>
    <property name="seekable">1</property>
    <property name="format">1</property>
    <property name="meta.media.width">${clap.meta.width}</property>
    <property name="meta.media.height">${clap.meta.height}</property>
    <property name="mlt_service">qimage</property>
    <property name="creation_time">${
      segment.createdAt || new Date().toISOString()
    }</property>
    <property name="shotcut:skipConvert">1</property>
    ${
      // uh, okay.. do we really need this?..
      // <property name="shotcut:hash">b22b329e4916bda3ada2ed544c9ba2b9</property>
      ''
    }
    <property name="shotcut:caption">${fileName}</property>
    ${
      ''
      // not sure what  <property name="xml">was here</property
      // is supposed to be
    }
    <property name="xml">was here</property>
  </producer>
  `
    )
    .join('')}
  <playlist id="playlist0">
    <property name="shotcut:video">1</property>
    <property name="shotcut:name">Video clips</property>
    ${videos
      .map(
        ({ segment, shortId }) => /* HTML*/ `
    <entry
      producer="${shortId}"
      in="${formatDuration(0)}"
      out="${formatDuration(segment.assetDurationInMs)}"
    />
`
      )
      .join('')}
  </playlist>
  <playlist id="playlist1">
    <property name="shotcut:video">1</property>
    <property name="shotcut:name">Storyboards</property>
    ${storyboards
      .map(
        ({ segment, shortId }) => /* HTML*/ `
    <entry
      producer="${shortId}"
      in="${formatDuration(0)}"
      out="${formatDuration(segment.assetDurationInMs)}"
    />
`
      )
      .join('')}
  </playlist>
  ${[...dialogues, ...sounds, ...music].map(
    ({ segment, filePath, fileName, shortId }) => /* HTML*/ `
  <chain id="${shortId}" out="${formatDuration(clap.meta.durationInMs)}">
    <property name="length">${formatDuration(clap.meta.durationInMs)}</property>
    <property name="eof">pause</property>
    <property name="resource">${filePath}</property>
    <property name="mlt_service">avformat-novalidate</property>
    <property name="meta.media.nb_streams">1</property>
    <property name="meta.media.0.stream.type">audio</property>
    ${
      ''
      /*
    I don't think we absolutely need to provide those as this is just meta

    <property name="meta.media.0.codec.sample_fmt">fltp</property>
    <property name="meta.media.0.codec.sample_rate">44100</property>
    <property name="meta.media.0.codec.channels">2</property>
    <property name="meta.media.0.codec.layout">stereo</property>
    <property name="meta.media.0.codec.name">mp3float</property>
    <property name="meta.media.0.codec.long_name">MP3 (MPEG audio layer 3)</property>
    <property name="meta.media.0.codec.bit_rate">150551</property>
    <property name="meta.attr.0.stream.encoder.markup">Lavc60.3.</property>
    <property name="meta.attr.encoder.markup">Lavf60.3.100</property>
    */
    }
    <property name="seekable">1</property>
    <property name="audio_index">0</property>
    <property name="video_index">-1</property>
    <property name="creation_time">${segment.createdAt}</property>
    <property name="astream">0</property>
    <property name="shotcut:skipConvert">1</property>
    ${
      ''
      // yeah well, let's skip this one as well
      // <property name="shotcut:hash">ee26f27a566e64d5ed116f433012e3d6</property>
    }
    <property name="shotcut:caption">${fileName}</property>
  </chain>`
  )}
  <playlist id="playlist2">
    <property name="shotcut:audio">1</property>
    <property name="shotcut:name">Dialogues & speech</property>
    ${dialogues.map(
      ({ segment, shortId }) => /* HTML*/ `
    <entry
      producer="${shortId}"
      in="${segment.startTimeInMs}"
      out="${segment.endTimeInMs}"
    />
    `
    )}
  </playlist>
  <playlist id="playlist3">
    <property name="shotcut:audio">1</property>
    <property name="shotcut:name">Sound effects</property>
    ${sounds.map(
      ({ segment, shortId }) => /* HTML*/ `
    <entry
      producer="${shortId}"
      in="${segment.startTimeInMs}"
      out="${segment.endTimeInMs}"
    />
    `
    )}
  </playlist>
  <playlist id="playlist4">
    <property name="shotcut:audio">1</property>
    <property name="shotcut:name">Music</property>
    ${music.map(
      ({ segment, shortId }) => /* HTML*/ `
    <entry
      producer="${shortId}"
      in="${segment.startTimeInMs}"
      out="${segment.endTimeInMs}"
    />
    `
    )}
  </playlist>
  <tractor
    id="tractor0"
    title="Shotcut version 24.04.28"
    in="00:00:00.000"
    out="${formatDuration(clap.meta.durationInMs)}">
    <property name="shotcut">1</property>
    <property name="shotcut:projectAudioChannels">2</property>
    <property name="shotcut:projectFolder">1</property>
    <property name="shotcut:skipConvert">0</property>
    <track producer="background"/>
    <track producer="playlist0"/>
    <track producer="playlist1"/>
    <track producer="playlist2" hide="video" />
    <track producer="playlist3" hide="video" />
    <track producer="playlist4" hide="video" />
    <transition id="transition0">
      <property name="a_track">0</property>
      <property name="b_track">1</property>
      <property name="mlt_service">mix</property>
      <property name="always_active">1</property>
      <property name="sum">1</property>
    </transition>
    <transition id="transition1">
      <property name="a_track">0</property>
      <property name="b_track">1</property>
      <property name="version">0.1</property>
      <property name="mlt_service">frei0r.cairoblend</property>
      <property name="threads">0</property>
      <property name="disable">1</property>
    </transition>
    <transition id="transition2">
    <property name="a_track">0</property>
    <property name="b_track">1</property>
    <property name="version">0.1</property>
    <property name="mlt_service">frei0r.cairoblend</property>
    <property name="threads">0</property>
    <property name="disable">1</property>
  </transition>
    <transition id="transition3">
      <property name="a_track">0</property>
      <property name="b_track">2</property>
      <property name="mlt_service">mix</property>
      <property name="always_active">1</property>
      <property name="sum">1</property>
    </transition>
    <transition id="transition4">
    <property name="a_track">0</property>
    <property name="b_track">3</property>
    <property name="mlt_service">mix</property>
    <property name="always_active">1</property>
    <property name="sum">1</property>
  </transition>
  <transition id="transition5">
  <property name="a_track">0</property>
  <property name="b_track">3</property>
  <property name="mlt_service">mix</property>
  <property name="always_active">1</property>
  <property name="sum">1</property>
</transition>
  </tractor>
</mlt>`
  },

  openKdenline: async (file: File) => {},

  saveKdenline: async () => {
    const { saveAnyFile } = get()
    const clap: ClapProject = useTimeline.getState().clap
    // const tracks: ClapTracks = useTimeline.getState().tracks

    throw new Error(`cannot run in a browser, unfortunately`)

    /*
    // hum.. we should add FPS to the ClapProject metadata
    const fps = 30 // clap.meta

    // for documentation, look at the example test file in:
    // https://www.npmjs.com/package/kdenlive?activeTab=code
    const project = new Project(fps)

    const cameraSegments = clap.segments.filter(s => s.category === ClapSegmentCategory.CAMERA)
 
    const segmentsWithNonEmptyAssets = clap.segments.filter(s => s.assetUrl)

    // const videoSegments = clap.segments.filter(s => s.category === ClapSegmentCategory.VIDEO && s.assetUrl)
    const videoTractor = project.addVideoTractor()

    // const soundSegments = clap.segments.filter(s => s.category === ClapSegmentCategory.SOUND && s.assetUrl)
    const soundTractor = project.addAudioTractor()

    // const voiceSegments = clap.segments.filter(s => s.category === ClapSegmentCategory.DIALOGUE && s.assetUrl)
    const voiceTractor = project.addAudioTractor()

    // const musicSegments = clap.segments.filter(s => s.category === ClapSegmentCategory.MUSIC && s.assetUrl)
    const musicTractor = project.addAudioTractor()

    for (const shot of cameraSegments) {
      const videoSegments = filterSegments(
        ClapSegmentFilteringMode.ANY,
        shot,
        segmentsWithNonEmptyAssets,
        ClapSegmentCategory.VIDEO
      )
      const videoSegment = videoSegments.at(0)
      if (videoSegment) { continue }

      const producer = project.addProducer(`${videoSegment.id}.mp4`)
			
      const entry = new Entry(
        producer,
        formatDuration(shot.startTimeInMs),
        formatDuration(shot.endTimeInMs)
      )
			videoTractor.addEntry(entry)
			// audio_track.addEntry(entry)
    }

    const xml = await project.toXML()
    const blob = new Blob([xml], { type: "text/xml" })
    saveAnyFile(blob, `my_project.kdenlive`)

    */
  },

  openOpenTimelineIO: async (file: File) => {},

  saveOpenTimelineIO: async () => {},

  saveEntitiesToClap: async (entities: ClapEntity[]): Promise<void> => {
    const blob = await serializeClap(newClap({ entities }))
    get().saveAnyFile(blob, `my_entities.clap`)
  },

  openEntitiesFromClap: async (file: File): Promise<ClapEntity[]> => {
    if (!file) {
      throw new Error('openEntities: no file provided')
    }

    const input = `${file.name || ''}`
    const fileType = `${file.type || ''}`
    console.log(`file type: ${fileType}`)

    const isClapFile = parseFileName(input).extension === 'clap'
    if (!isClapFile) {
      throw new Error(`openEntities: cannot open this file type: ${fileType}`)
    }

    const { entities } = await parseClap(file)
    return entities
  },
}))