import type { FeedItem } from '../../interfaces/feed.types.js';

export class TerminalFormatter {
  format(items: FeedItem[]): string {
    if (items.length === 0) {
      return '\n  No items to display.\n';
    }

    const lines: string[] = [];
    lines.push('');
    lines.push(`  ${this.bold(`Found ${items.length} item${items.length === 1 ? '' : 's'}`)}`);
    lines.push('');

    items.forEach((item, index) => {
      const number = `${index + 1}.`.padStart(3);
      lines.push(`  ${this.dim(number)} ${this.cyan(item.source)}`);
      lines.push(`     ${this.bold(item.title)}`);
      lines.push(`     ${this.dim(this.formatDate(item.publishedAt))}`);
      lines.push(`     ${this.blue(item.url)}`);
      
      if (item.summary) {
        const truncated = this.truncate(item.summary, 80);
        lines.push(`     ${this.dim(truncated)}`);
      }
      
      lines.push('');
    });

    return lines.join('\n');
  }

  private formatDate(date: Date): string {
    return date.toLocaleString('en-US', {
      year: 'numeric',
      month: 'short',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit'
    });
  }

  private truncate(text: string, maxLength: number): string {
    if (text.length <= maxLength) {
      return text;
    }
    return text.substring(0, maxLength - 3) + '...';
  }

  // ANSI color codes
  private bold(text: string): string {
    return `\x1b[1m${text}\x1b[0m`;
  }

  private dim(text: string): string {
    return `\x1b[2m${text}\x1b[0m`;
  }

  private cyan(text: string): string {
    return `\x1b[36m${text}\x1b[0m`;
  }

  private blue(text: string): string {
    return `\x1b[34m${text}\x1b[0m`;
  }
}