export interface ManualReviewItem {
  /** The file, or the component `.ts` for an inline template. */
  file: string;
  /** 1-based. */
  line: number;
  snippet: string;
  reason: string;
}

export type ReportSink = (message: string) => void;

export function reportManualReviewItems(items: ManualReviewItem[], report: ReportSink): void {
  if (items.length === 0) return;

  const seen = new Set<string>();
  const byFile = new Map<string, ManualReviewItem[]>();
  for (const item of items) {
    const key = `${item.file}:${item.line}:${item.reason}`;
    if (seen.has(key)) continue;
    seen.add(key);
    const bucket = byFile.get(item.file) ?? [];
    bucket.push(item);
    byFile.set(item.file, bucket);
  }

  const lines: string[] = [
    '',
    `The input-signal-reads migration left ${seen.size} location(s) unchanged because`,
    'they cannot be migrated automatically. Please review and update them manually:',
    '',
  ];

  for (const [file, fileItems] of byFile) {
    lines.push(`  ${file}`);
    for (const item of fileItems.sort((a, b) => a.line - b.line)) {
      lines.push(`    L${item.line}  ${item.snippet}`);
      lines.push(`          ↳ ${item.reason}`);
    }
    lines.push('');
  }

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

export function toSnippet(text: string): string {
  return text.replace(/\s+/g, ' ').trim();
}