progress.ts

export class ProgressBar {
  private total: number;
  private current: number = 0;
  private barLength: number;
  private startTime: number;

  constructor(total: number) {
    this.total = total;
    this.startTime = Date.now();
    // Adjust bar length based on terminal width
    const terminalWidth = process.stdout.columns || 80;
    this.barLength = Math.min(40, Math.max(20, terminalWidth - 60));
  }

  increment(): void {
    this.current++;
    this.render();
  }

  private render(): void {
    const percentage = Math.floor((this.current / this.total) * 100);
    const filledLength = Math.floor((this.barLength * this.current) / this.total);
    const bar = "█".repeat(filledLength) + "░".repeat(this.barLength - filledLength);
    
    const elapsed = Date.now() - this.startTime;
    const rate = this.current / (elapsed / 1000);
    const eta = this.current === 0 ? 0 : (this.total - this.current) / rate;
    
    const etaFormatted = eta > 60 
      ? `${Math.floor(eta / 60)}m ${Math.floor(eta % 60)}s`
      : `${Math.floor(eta)}s`;

    // Clear line and write progress
    if (process.stdout.isTTY) {
      process.stdout.clearLine(0);
      process.stdout.cursorTo(0);
    }
    
    process.stdout.write(
      `[${bar}] ${percentage}% | ${this.current}/${this.total} | ETA: ${etaFormatted}`
    );

    if (this.current === this.total) {
      const totalTime = elapsed / 1000;
      const totalFormatted = totalTime > 60
        ? `${Math.floor(totalTime / 60)}m ${Math.floor(totalTime % 60)}s`
        : `${totalTime.toFixed(1)}s`;
      process.stdout.write(` | Time: ${totalFormatted}\n`);
    }
  }
}