// Taking one outline out of the app: print or save as PDF, share it, or download it.
import { buildOutlineHtml } from './bibleUtils.jsx';
import { outlineToText } from './outline.js';

const slug = (s) => String(s).replace(/[^\w]+/g, '-').replace(/^-|-$/g, '') || 'outline';

function downloadBlob(blob, filename) {
  const url = URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = url;
  link.download = filename;
  document.body.appendChild(link);
  link.click();
  link.remove();
  URL.revokeObjectURL(url);
}

// What gets shared as text: a heading, then the outline.
export const outlineShareText = ({ title, subtitle = '', tree }) => `${title}${subtitle ? `\n${subtitle}` : ''}\n\n${outlineToText(tree)}`;

// Opens a print-ready page of just this outline. Returns false when the browser blocked the window.
export function printOutline({ title, subtitle, tree }) {
  const win = window.open('', '_blank');
  if (!win) return false;
  win.document.write(buildOutlineHtml({ title, subtitle, tree }));
  win.document.close();
  win.onload = () => { win.focus(); win.print(); };
  return true;
}

// Uses the phone/tablet/computer share sheet when there is one (Messages, Mail, AirDrop…), otherwise
// copies the text. -> 'shared' | 'copied' | 'cancelled' | 'failed'
export async function shareOutline(outline) {
  const text = outlineShareText(outline);
  if (navigator.share) {
    try {
      await navigator.share({ title: `${outline.title} — Outline`, text });
      return 'shared';
    } catch (err) {
      if (err?.name === 'AbortError') return 'cancelled';
      // fall through to copying
    }
  }
  try {
    await navigator.clipboard.writeText(text);
    return 'copied';
  } catch {
    return 'failed';
  }
}

export function downloadOutlineMarkdown({ title, subtitle, tree }) {
  const text = `# ${title}\n\n${subtitle ? `*${subtitle}*\n\n` : ''}${tree.length ? outlineToText(tree) : ''}\n`;
  downloadBlob(new Blob([text], { type: 'text/markdown;charset=utf-8' }), `${slug(title)}-outline.md`);
}

export async function downloadOutlineDocx(outline) {
  const { buildOutlineDocxBlob } = await import('./docxExport.js'); // the Word library only loads when used
  downloadBlob(await buildOutlineDocxBlob(outline), `${slug(outline.title)}-outline.docx`);
}