import useVirtualPages from '@/hooks/useVirtualPages'
import VirtualDirectory, { VirtualFile } from './VirtualDirectory'
import { ShallowRef, shallowRef } from 'vue'
import { alertTipType, usePluginHooksType } from '@/types/type'
import VirtualPage, { VirtualPages } from './VirtualPage'
import useRootVDirectory from '@/hooks/useRootVDirectory'

export enum PluginGroup {
   default = 'default',
   mainMenu = 'mainMenu',
   // 导入的时候会立即执行函数一次
   immediately = 'immediately'
}

export interface registerComponentOption {
   key: string
   name: string
   icon?: any
   getComponent: () => Promise<any>
   group?: PluginGroup[]
   filter: (VDirectories: VirtualDirectory[], VFiles: VirtualFile[]) => boolean
   disable?: boolean
   exitConfirm?: boolean
   // 若为true，则只会创建一个页面，当存在已创建页面则会直接将VFile和VDir加到curr里面
   single?: boolean
   priority?: number
}

export type Plugin = {
   // 用于显示的名字
   name: string
   // 代表插件的icon
   icon?: ShallowRef<any>
   // 是否禁用插件
   disable: boolean
   // 插件所属的group，用于区分插件使用的场合
   group: PluginGroup[]
   // 插件优先级
   priority: number
   // 判断在未禁用时是否可以使用这个组件
   // 使用组件即调用下面的func
   filter: (
      VDirectories: VirtualDirectory[],
      VFiles: VirtualFile[],
      VPages: VirtualPages
   ) => boolean
   func: (
      VDirectories: VirtualDirectory[],
      VFiles: VirtualFile[],
      hooks: usePluginHooksType,
      ...args: any[]
   ) => void
}

export default class PluginCenter {
   constructor(globalAlertTip: alertTipType) {
      this.pluginsMap = {}
      this.globalAlertTip = globalAlertTip
   }
   pluginsMap: {
      [key: string]: Plugin
   }

   globalAlertTip: alertTipType

   register(key: string, plugin: Plugin) {
      this.pluginsMap[key] = plugin
      if (plugin.group.includes(PluginGroup.immediately)) {
         this.usePlugin(key, [], [], this.usePluginHook)
      }
   }

   deregister(key: string) {
      delete this.pluginsMap[key]
   }

   /**
    * 便捷地注册一个组件为插件，触发时直接用新页面打开，页面名为key
    */
   registerComponent(option: registerComponentOption): void {
      const {
         key,
         name,
         getComponent,
         icon,
         filter,
         group = [PluginGroup.default],
         disable = false,
         exitConfirm = false,
         single = false,
         priority = 0
      } = option
      let _component: any
      const views = useVirtualPages()
      this.register(key, {
         name,
         filter,
         icon: shallowRef(icon),
         group,
         disable,
         priority,
         func: async (
            VDirectories: VirtualDirectory[],
            VFiles: VirtualFile[]
         ) => {
            if (filter(VDirectories, VFiles) === false) {
               return
            }

            if (_component === undefined) {
               const setAlertTip = this.globalAlertTip(`加载 ${name} 插件中`)
               _component = await getComponent()
               setAlertTip &&
                  setAlertTip(`加载 ${name} 插件完成`, {
                     type: 'success',
                     timeout: 2000
                  })
            }
            const _findRes = views.find(_component) as VirtualPage[]
            if (single && _findRes.length !== 0) {
               const view = _findRes[0]
               view.currentFiles = [...view.currentFiles, ...VFiles]
               view.currentDirectories = [
                  ...view.currentDirectories,
                  ...VDirectories
               ]
            } else {
               views.push(_component, key, VDirectories, VFiles, {
                  VirtualPageOption: {
                     exitConfirm,
                     allowCopy: single === false
                  }
               })
            }
         }
      })
   }

   getUsablePlugin(
      VDirectories: VirtualDirectory[],
      VFiles: VirtualFile[],
      option?: {
         group?: PluginGroup[]
      }
   ) {
      const { group = [PluginGroup.default] } = option ?? {}
      const usableList = []
      const views = useVirtualPages()
      for (let key of Object.keys(this.pluginsMap)) {
         const _plugin = this.pluginsMap[key]
         if (
            !_plugin.disable &&
            _plugin.group.filter((v) => group.includes(v)).length > 0 &&
            _plugin.filter(VDirectories, VFiles, views)
         ) {
            usableList.push(key)
         }
      }
      const res = usableList.map((key) => ({
         key,
         ...this.pluginsMap[key]
      }))
      res.sort((a, b) => b.priority - a.priority)
      return res
   }

   get usePluginHook(): usePluginHooksType {
      return {
         globalAlertTip: this.globalAlertTip,
         getViews: useVirtualPages,
         getPluginCenter: () => this,
         getRootVDirectory: () => useRootVDirectory()
      }
   }

   // usePlugin(
   //    key: string,
   //    VDirectories?: VirtualDirectory[],
   //    VFiles?: VirtualFile[],
   //    ...args: any[]
   // ): void
   usePlugin(
      key: string,
      VDirectories?: VirtualDirectory[],
      VFiles?: VirtualFile[],
      ...args: any[]
   ) {
      this.pluginsMap[key].func(
         VDirectories ?? [],
         VFiles ?? [],
         this.usePluginHook,
         ...args
      )
   }
}