import {stdout as slog} from "single-line-log";

export default class ProgressBar {
  private readonly description: string;
  private readonly length: number;
  private lastcell: number;
  private readonly pattern: string;
  constructor(description:string, bar_length:number, pattern?:string) {
    this.description = description || 'Progress';
    this.length = bar_length || 25;
    this.lastcell = -1;
    this.pattern = pattern || '';
  }
  render(opts: any) {
    const cell_num = Math.floor(opts.percent * this.length);
    if (this.lastcell === cell_num) return;
    if (this.lastcell > cell_num) return;
    this.lastcell = cell_num;
    let cell = '';
    for (let i = 0; i < cell_num; i++) {
      cell += this.pattern;
    }
    let empty = '';
    for (let i = 0; i < this.length - cell_num; i++) {
      empty += '░';
    }
    const cmdText = this.description + ' ' + (100 * opts.percent).toFixed(2) + '% ' + cell + empty + ' ' + opts.completed + '/' + opts.total;
    slog(cmdText);
  }
};