import { routeName, router } from '@/router'
import { Dialog } from '@kankan/components/index'
import { ref, Ref, watch } from 'vue'
import { useAsyncBus, Handler } from './useAsyncBus'
import { useViewStack } from './useViewStack'
import { disabledMap } from './custom'
import { ui18n } from '@/lang'
import { useConfirm } from '@/hook'

export const editBus = useAsyncBus<{ save: void; leave: void }>()
export type EditHandler = () => void
export type EditStatus = {
  edit: EditHandler
  desave: EditHandler
  leaveSave: EditHandler
  leave: EditHandler
}

let mark: EditStatus & { isedit: boolean; isdesave: boolean }

export type KV<T> = [Ref<T>, T] | [Ref<T>, T, T]
export type KVS<T> = Array<KV<T>>
export type VS<T> = Array<KVS<T>[number][1]>

// 进入编辑界面
export const useEdit = <T>(args?: KV<T> | KVS<T>) => {
  if (!args) return mark.edit()

  const kvs = (Array.isArray(args[0]) ? args : [args]) as KVS<T>
  const cacheks = kvs.map(([k, _, d = k.value]) => d)
  const updateKs = (value: VS<T>) => {
    for (let i = 0; i < kvs.length; i++) {
      kvs[i][0].value = value[i]
    }
  }
  mark.edit()
  updateKs(kvs.map(([_, v]) => v))
  editBus.on('leave', () => updateKs(cacheks), { last: true })
}

// 保存
export const useEmitSave = () => {
  editBus.emit('save').then(() => {
    if (!disabledMap.autoLeave) {
      useLeaveEdit()
    } else {
      useLeaveSave()
    }
  })
}

// 退出
let sureBackPage = true
export const useEmitLeave = async (isBack = true) => {
  if (mark.isdesave) {
    const isLeave = await useConfirm(ui18n.t('sys.forceLeaveConfirm'))
    if (!isLeave) {
      return false
    }
  }
  sureBackPage = isBack
  editBus.on('leave', () => (sureBackPage = true), { last: true })
  editBus.emit('leave').then(useLeaveEdit)
  return true
}

export const useLeaveEditRaw = () => mark.leave()

// 退出保存
export const useLeaveSave = () => {
  editBus.off('save')
  mark.leaveSave()
}

// 退出编辑
export const useLeaveEdit = () => {
  editBus.off('save')
  editBus.off('leave')
  mark.leave()
  mark.leaveSave()
}

export type DesaveArgs = {
  save?: Handler
  leave?: Handler
}
// 进入未保存模式
export const useDesave = (cbs: DesaveArgs = {}) => {
  mark.desave()
  cbs.leave && editBus.on('leave', cbs.leave)
  cbs.save && editBus.on('save', cbs.save)
}

export type DesaveArgsAssistArgs<T> = DesaveArgs & {
  intercept?: (newCurrent: T, oldCurrent: T) => boolean
  auto?: boolean
  backup?: () => void
  recovery?: () => void
}

export function useDesaveAssist<T extends object>(
  current: T,
  setting: DesaveArgsAssistArgs<T> & { auto: false }
): () => () => void
export function useDesaveAssist<T extends object>(
  current: T,
  setting: DesaveArgsAssistArgs<T> & { auto: true }
): { desave: Ref<boolean> }
export function useDesaveAssist<T extends object>(
  current: T,
  setting: DesaveArgsAssistArgs<T>
) {
  const desave = ref(false)
  const { recovery, backup, leave } = setting
  const leaveHandler = () => {
    isSave = false;
    if (recovery || backup) {
      recovery && recovery()
      backup && backup()
      desave.value = false
      leave && (leave as any)()
    }
  }
   

  let isSave = false
  const save = async args => {
    isSave = true
    try {
      await setting.save(args)
    } catch (e) {
      // recovery && recovery()
      throw e
    }
    isSave = false
  }

  const handler = (newv, oldv) => {
    if (!isSave) {
      if (!setting.intercept || setting.intercept(newv, oldv)) {
        desave.value = true
        mark.isedit || useEdit()
        useDesave({ save })
        backup && editBus.on('save', backup, { last: true })
      }
      leaveHandler && editBus.on('leave', leaveHandler, { last: true })
    }
  }
  const saveWatch = () => {
    backup && backup()
    return watch(current, handler, { deep: true })
  }

  if (setting.auto) {
    useViewStack(saveWatch)

    return { desave }
  } else {
    return saveWatch
  }
}

export const useBack = (type: 'save' | 'leave' = 'leave') => {
  if (sureBackPage && (type === 'leave' || !disabledMap.autoLeave)) {
    if (!history.state.back) {
      router.replace({ name: routeName.value.query })
    } else {
      router.back()
    }
  }
}

type HookArgs = (...args: any) => void | (() => any | void)
export const useViewEdit = (
  hook?: HookArgs,
  cb: (type: 'save' | 'leave') => void = useBack
) =>
  useViewStack(() => {
    useEdit()
    editBus.on('leave', () => cb('leave'), { last: true })
    editBus.on('save', () => cb('save'), { last: true })
    const exitFn = hook && hook()
    return () => {
      useLeaveEdit()
      exitFn && exitFn()
    }
  })

export const setupEdit = (status: EditStatus) => {
  mark = {
    edit: () => {
      mark.isedit = true
      status.edit()
    },
    desave: () => {
      mark.isdesave = true
      status.desave()
    },
    leave: () => {
      mark.isdesave = false
      mark.isedit = false
      status.leave()
    },
    leaveSave: () => {
      mark.isdesave = false
      status.leaveSave()
    },
    isedit: false,
    isdesave: false
  }
}