import * as readline from 'readline'

export class ConsolePrompt {
  private readonly rl: readline.Interface
  private isClosed: boolean = false

  constructor(private readonly commandHandler: (command: string) => void) {
    this.rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout
    })

    this.rl.on('close', () => {
      this.isClosed = true
    })
  }

  public start(): void {
    if (this.isClosed) return
    this.promptCommand()
  }

  public close(): void {
    this.rl.close()
  }

  private promptCommand(): void {
    this.rl.question('> ', (command: string) => {
      this.commandHandler(command)
      this.promptCommand()
    })
  }
}