import chalk from 'chalk';
import { sanitizeTerminalText } from './terminal';

/**
 * Render the OPML import preview shown by `import opml`.
 */
export function formatOpmlImportResult(result: {
  title?: string;
  feeds: Array<{ title: string; xmlUrl: string; category?: string }>;
  errors: Array<{ outline: string; error: string }>;
  totalOutlines: number;
  validFeeds: number;
}): string {
  const lines: string[] = [];

  lines.push('');
  if (result.title) {
    lines.push(chalk.bold.cyan(`OPML: ${sanitizeTerminalText(result.title)}`));
  } else {
    lines.push(chalk.bold.cyan('OPML Import'));
  }
  lines.push(chalk.cyan('═'.repeat(40)));
  lines.push(`  Total outlines: ${result.totalOutlines}`);
  lines.push(`  Valid feeds: ${chalk.green(result.validFeeds.toString())}`);

  if (result.errors.length > 0) {
    lines.push(`  Errors: ${chalk.red(result.errors.length.toString())}`);
    for (const e of result.errors.slice(0, 5)) {
      lines.push(chalk.red(`    - ${sanitizeTerminalText(e.outline)}: ${sanitizeTerminalText(e.error)}`));
    }
    if (result.errors.length > 5) {
      lines.push(chalk.red(`    ... and ${result.errors.length - 5} more errors`));
    }
  }

  if (result.feeds.length > 0) {
    lines.push('');
    lines.push(chalk.bold('Feeds to import:'));
    for (const feed of result.feeds.slice(0, 10)) {
      const category = feed.category ? chalk.gray(` [${sanitizeTerminalText(feed.category)}]`) : '';
      lines.push(`  - ${sanitizeTerminalText(feed.title)}${category}`);
    }
    if (result.feeds.length > 10) {
      lines.push(chalk.gray(`  ... and ${result.feeds.length - 10} more feeds`));
    }
  }

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