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import { SPINNERS, SpinnerType } from './spinners.ts';import { clearCurrentLine, printOnCurrentLine, printNewLine } from './util.ts';import { red, green, bold, yellow } from 'https://deno.land/std/fmt/colors.ts';
export class Spinner {  private static instance: Spinner;  private currentText: string;  private currentTimer: number | null;  private spinner: any;  private cols: number;  private textEncoder: TextEncoder;  private spinnerType: SpinnerType
  private constructor() {    this.spinnerType = 'dots2';    this.spinner = SPINNERS[this.spinnerType];    this.cols = 0;    this.textEncoder = new TextEncoder();    this.currentTimer = null;    this.currentText = '';  }
  public static getInstance() {    if (Spinner.instance === undefined) {      return new Spinner();    } else {      return Spinner.instance;    }  }
  public setSpinnerType(type: SpinnerType) {    if (SPINNERS[type]) {      this.spinner = SPINNERS[type];    } else {      throw new Error(`unknown spinner type ${type}`);    }  }
  public async start(text: string) {    if (this.isRunning()) {      throw new Error(        "Can't start a new spinner while a spinner is already running!"      );    }
    this.currentText = text;    let currentFrame = 0;    let totalFrames = this.spinner.frames.length;
    this.currentTimer = setInterval(async () => {      let message = `${this.spinner.frames[currentFrame]} ${this.currentText}`;      let lastMessage;
      if (lastMessage !== message) {        await clearCurrentLine(this.textEncoder, this.cols);      }
      await this.print(message);
      lastMessage = message;      currentFrame = (currentFrame + 1) % totalFrames;    }, this.spinner.interval);  }
  public async setText(text: string) {    this.currentText = text;  }
  public async stop() {    this.stopSpinner();    await clearCurrentLine(this.textEncoder, this.cols);    await this.printNewLine();  }
  private async stopSpinner(text?: string) {    if (this.currentTimer) {      clearInterval(this.currentTimer);    }
    if (text) {      await this.print(text);    }
    this.currentTimer = null;  }
  private async print(text: string) {    if (text.length > this.cols) {      this.cols = text.length;    }
    await printOnCurrentLine(this.textEncoder, this.cols, text);  }
  private async printNewLine() {    await printNewLine(this.textEncoder, this.cols);  }
  public isRunning() {    if (this.currentTimer !== null) {      return true;    } else {      return false;    }  }
  private async stopSpinnerWithStatus(status: string, text?: string) {    if (text) {      this.setText(text);    }
    let message = `${status} ${this.currentText}`;
    await this.stopSpinner(message);
    await this.print(message);    await this.printNewLine();  }
  public async succeed(text?: string) {    await this.stopSpinnerWithStatus(bold(green('√')), text);  }
  public async fail(text?: string) {    await this.stopSpinnerWithStatus(bold(red('×')), text);  }
  public async warn(text?: string) {    await this.stopSpinnerWithStatus(bold(yellow('!!')), text);  }
  public async info(text?: string) {    await this.stopSpinnerWithStatus(bold(yellow('i')), text);  }}