import { ref, watchEffect } from "vue";
import { autoSetModeCallback, createTemploraryID, unSetModelUpdate } from './sys'
import { 
  addStoreItem, 
  deleteStoreItem, 
  fetchStoreItems, 
  recoverStoreItems, 
  saveStoreItems, 
  updateStoreItem,
  togetherCallback,
  diffStoreItemsChange
} from '@/utils'
import {
  fetchRecords,
  postAddRecord,
  postUpdateRecord,
  postDeleteRecord,
  RecordStatus,
  postMegerRecord,
  blobToFile,
  uploadFile,
  fetchRecordStatus
} from '@/api'
import { 
  getRecordFragments, 
  initRecordFragmentsByRecord,
  recordFragments,
  backupRecordFragments,
  recoverRecordFragments,
  saveRecordFragments
} from './record-fragment'

import type { Record as SRecord } from '@/api'
import { Message } from "bill/index";

export type Record = LocalMode<SRecord, 'cover'> 
export type Records = Record[]

export const records = ref<Records>([])

export const createRecord = (record: Partial<Record> = {}): Record => ({
  id: createTemploraryID(),
  title: '讲解视频' + (records.value.length + 1),
  cover: '',
  url: '',
  status: RecordStatus.UN,
  sort: Math.min(...records.value.map(item => item.sort)) - 1,
  ...record
})


let bcRecords: Records = []
export const getBackupRecords = () => bcRecords
export const backupRecords = () => {
  bcRecords = records.value.map(record => ({...record }))
}
export const recoverRecords = recoverStoreItems(records, getBackupRecords)

const refreshRecords: NodeJS.Timeout[] = []
const refreshRecordStatus = async (record: Record) => {
  const status = await fetchRecordStatus(record.id)
  if (status === RecordStatus.SUCCESS) {
    refreshRecords.forEach(clearTimeout)
    refreshRecords.length = 0
    initialRecords()
  } else {
    refreshRecords.push(
      setTimeout(refreshRecordStatus.bind(null, record), 3000)
    )
  }
}


const getRecordMergeFiles = (record: Record) => {
  const fragments = getRecordFragments(record)
  const files = fragments
    .filter(fragment => typeof fragment.url !== 'string')
    .map(fragment => blobToFile((fragment.url as Blob), '.mp4'))
  return files
}

export const initialRecords = async () => {
  const serviceRecords = await fetchRecords()
  unSetModelUpdate(() => records.value = serviceRecords)
  await Promise.all(records.value.map(initRecordFragmentsByRecord))
  for (const record of records.value) {
    if (record.status === RecordStatus.RUN) {
      refreshRecordStatus(record)
    }
  }
  backupRecords()
}

export const addRecord = addStoreItem(records, async (record) => {
  const cover = record.cover ? await uploadFile(record.cover) : record.cover
  const serviceRecord = await postAddRecord({ ...record, cover }, getRecordMergeFiles(record))
  record.id = serviceRecord.id
  await postUpdateRecord(record as SRecord)
  return record
})
export const updateRecord = updateStoreItem(records, async (record) => {
  const cover = record.cover ? await uploadFile(record.cover) : record.cover
  return await postUpdateRecord({ ...record, cover })
})
export const deleteRecord = deleteStoreItem(records, async record => {
  recordFragments.value = recordFragments.value.filter(fragment => fragment.recordId !== record.id)
  await postDeleteRecord(record.id)
})
export const saveRecords = saveStoreItems(
  records, 
  getBackupRecords,
  {
    add: addRecord,
    delete: deleteRecord,
    update: updateRecord
  }
)
export const autoSaveRecords = autoSetModeCallback(
  [records, recordFragments], 
  {
    backup: togetherCallback([backupRecordFragments, backupRecords]),
    recovery: togetherCallback([recoverRecordFragments, recoverRecords]),
    save: async () => {
      if (!records.value.every(record => record.title)) {
        Message.warning('视频名称不可为空')
        throw '视频名称不可为空'
      }

      for (let i = 0; i < records.value.length; i++) {
        records.value[i].sort = i
      }

      const oldRecords = getBackupRecords()
      const { added } = diffStoreItemsChange(records.value, oldRecords)
      await saveRecords()
      await saveRecordFragments()

      const files = records.value
        .filter(record => !added.includes(record))
        .map(record => ({ record, merge: getRecordMergeFiles(record) }))
        .filter(({merge}) => merge.length)

      await Promise.all(files.map(({record, merge}) => postMegerRecord(merge, record.id)))
      await initialRecords()
    }
  }
)

export { RecordStatus }