import Logger from './Logger';
import { TaskPool } from './TaskPool';
import { WebsocketClient } from './WebsocketUtils';
import { util } from '@kit.ArkTS';

const Tag = "CommandService"

interface Message<T = Object> {
  type: CommandType
  reqCode: string
  body: T
}

interface HandleAlarmBody {
  alarmId: string
  handleInfo: string
}

interface CommandBody {
  lineId: string
  code: string
  name: string
}

interface ResponseMessage {
  code: string
  msg: string
}

enum CommandType {
  HandleAlarm = "handleAlarm",
  PostCmd = "PostCmd"
}

enum CommandCode {
  GetHomePosition = 'getHomePosition',
  ToHomePosition = 'toHomePosition',
  GetChargePosition = 'getChargePosition',
  ToChargePosition = 'toChargePosition',
  GetScanPosition = 'getScanPosition',
  ToScanPosition = 'toScanPosition',
}

export class CommandService {
  private service?: WebsocketClient
  private taskPool: TaskPool<boolean> = new TaskPool()
  private static instance: CommandService
  private tick: number = -1
  private commandCallback: Map<string, Function> = new Map()

  constructor(url: string) {
    if (!CommandService.instance) {
      this.service = new WebsocketClient(url, this.deal)
      CommandService.instance = this
    }
    return CommandService.instance
  }

  private deal(message: string) {
    if (message === "pong") {
      Logger.info("心跳回应")
      return ""
    } else {
      try {
        let response: Message<ResponseMessage> = JSON.parse(message)
        if (response.type === CommandType.PostCmd) {
          this.commandCallback.get(response.reqCode)?.(response.body)
          this.commandCallback.delete(response.reqCode)
        }
        return message
      } catch (e) {
        Logger.error(Tag, "解析报文出错", JSON.stringify(e))
        return ""
      }
    }
  }

  private send(message: Message) {
    return new Promise<void | ResponseMessage>((resolve, reject) => {
      this.taskPool.add({
        execute: () => {
          if (message.type === CommandType.PostCmd) {
            return new Promise<boolean>((_resolve, _reject) => {
              this.service!.send(JSON.stringify(message)).then(() => {
                this.commandCallback.set(message.reqCode, (res: ResponseMessage) => resolve(res))
                _resolve(true)
              }).catch(_reject)
            })
          } else {
            return this.service!.send(JSON.stringify(message))
          }
        },
        repair: (): Promise<void> => {
          return this.service!.reconnect();
        },
        success: () => {
          resolve()
        },
        error: () => {
          reject()
        },
        retryCount: 5
      })
    })
  }

  init() {
    return new Promise<void>((resolve, reject) => {
      this.service!.connect().then(() => {
        this.tick = setInterval(() => {
          this.service?.send("ping")
        }, 1000 * 15)
        resolve()
      }).catch(reject)
    })
  }

  subscribe(cb: Function) {
    this.service!.subscribe(cb)
  }

  unsubscribe(cb: Function) {
    this.service!.unsubscribe(cb)
  }

  close(): Promise<boolean> {
    clearInterval(this.tick)
    return this.service!.close()
  }

  submitAlarm(alarmId: string, handleInfo: string): Promise<void> {
    let handleBody: HandleAlarmBody = {
      alarmId,
      handleInfo
    }
    return this.send({
      type: CommandType.HandleAlarm,
      reqCode: util.generateRandomUUID(true),
      body: handleBody
    }) as Promise<void>
  }

  submitCommand(lineId: string, code: CommandCode, name: string): Promise<ResponseMessage> {
    let commandBody: CommandBody = {
      lineId,
      code,
      name
    }
    return this.send({
      type: CommandType.PostCmd,
      reqCode: util.generateRandomUUID(true),
      body: commandBody
    }) as Promise<ResponseMessage>
  }
}

export const commandService =
  new CommandService("ws://testdevice.duolunxc.com/car-inspection-rest/websocket/pad?deviceNo=666666")