import { Subject, take } from 'rxjs';
import { Message, MessageLog, ConnectionRequest } from '../interfaces/general.interface';
import { GrpcServiceMethod } from '../services/grpc.service.method';
import { readFileSync } from 'fs';
import { ServerClientManager } from '../services/server-client.service';

// Subject for bidirectional communication
const connectionService: ServerClientManager = new ServerClientManager(new GrpcServiceMethod())
const messagesJSON: any = readFileSync('payload.json')
let parsedMessages: any[] = JSON.parse(messagesJSON) // load the fake messages generated for this trial 
let targetserver: string = 'localhost:3001'
let targetserver2: string = 'localhost:3002'
let hostServer: string = 'localhost:3000'
let array: any[] = [] // Used for testing                     
let connectionRequest: ConnectionRequest = {
  database: 'grpc1',
  server: {
    serverUrl: hostServer,
    connectionType: 'GRPC',
    messageToBePublishedfromApplication: new Subject<Message>()
  },
  client: {
    targetServer: targetserver,
    connectionType: 'GRPC',
    messageToBeReceivedFromRemote: new Subject<Message>()
  }
}

// Handler for the incoming Messages from the other side. 
connectionRequest.client.messageToBeReceivedFromRemote.subscribe({
  next: request => {
    // Application logic comes here. This is where the asortment takes place, of decidiing whose messages it belongs of what it is
    if ((request.message as MessageLog).appData.msgPayload == 'Query') {
      generateFakeStreamResponse(request).subscribe({
        next: (responseMessage: Message) => {
          // console.log(`Processing request:${request.id}....`)
          connectionRequest.server.messageToBePublishedfromApplication.next(responseMessage)
        },
        error: error => console.error(error),
        complete: () => {
          console.log(`Stream request for ${request.id} is queued.`) // shpuld be indefinite
        }
      })
    } else {
      array.push(request)
      console.log(`Received messages from the other side: ${(request.message as MessageLog).appData.msgId}`)
    }
  },
  error: error => console.error(error),
  complete: () => console.log(`Response for incoming generated. But this will never stop, and should not either.`)
})



connectionService.generateConnection(connectionRequest)

/* Simple Test */
// let generateFakeMessagesToBePublished = stream().pipe(take(10))
// generateFakeMessagesToBePublished.subscribe({
//   next: message => {
//     let payload: Message = {
//       id: hostServer,
//       message: message
//     }
//     connectionRequest.server.messageToBePublishedfromApplication.next(payload)
//   }
// })


/* Complex Test: Expected out come, both must receive 14 message by the end. Havent try to disconnect.*/
setTimeout(() => {
  let message = {
    id: parsedMessages[10].appData.msgId,
    message: parsedMessages[10] // Choose this number, because i purposely use the 11th message and change the msgPayload property to query to emulate a request
  }
  connectionRequest.server.messageToBePublishedfromApplication.next(message)
}, 3000)
setTimeout(() => {
  let message = {
    id: parsedMessages[11].appData.msgId,
    message: parsedMessages[11]// Choose this number, because i purposely use the 12th message and change the msgPayload property to query to emulate a request
  }
  connectionRequest.server.messageToBePublishedfromApplication.next(message)
}, 4000)
setTimeout(() => {
  console.log(`All received data: ${array.length}`)
}, 10000)
setTimeout(() => {
  console.log(`All received data: ${array.length}`)
}, 20000)


// this is just to publish an array of fake data as a Subject
function stream(): Subject<any> {
  let result: Subject<any> = new Subject()
  let messages: any[] = parsedMessages
  let count = 0
  const intervalId = setInterval(() => {
    result.next(messages[count]);
    count++;
    if (count >= 1000) {
      clearInterval(intervalId);
      result.complete();
    }
  }, 500)
  return result
}


function generateFakeStreamResponse(request: any): Subject<any> {
  let res: Subject<any> = new Subject()
  stream().pipe(take(7)).subscribe({
    next: element => {
      let message = {
        id: request.id, // Caller's 
        message: element
      }
      res.next(message)
    },
    error: error => console.error(error),
    complete: () => console.log(`Stream response for ${request.id} has been prepared.`)
  })
  return res
}