// Share an outline: a read-only link anyone can open (no account), or the plain text.
import { useState } from 'react';
import Sheet from './reader/Sheet.jsx';
import { useToast } from './Toasts.jsx';
import { useOutlineShareLink } from '../hooks/useOutlineShareLink.js';
import { shareOutline } from '../utils/outlineExport.js';

const btn = 'rounded-xl border border-[var(--r-line)] px-3.5 py-2 text-sm hover:bg-black/5 disabled:opacity-50';

export default function ShareOutlineSheet({ open, onClose, projectId, outline }) {
  const { toast } = useToast();
  const link = useOutlineShareLink(projectId, open);
  const [copied, setCopied] = useState(false);

  const copyLink = async () => {
    try { await navigator.clipboard.writeText(link.url); setCopied(true); window.setTimeout(() => setCopied(false), 2000); } catch { toast('Couldn’t copy. Select the link and copy it.', { tone: 'error' }); }
  };
  // The phone/computer share sheet, with the link (falls back to copying it)
  const shareLink = async () => {
    if (navigator.share) {
      try { await navigator.share({ title: `${outline.title} — Outline`, url: link.url }); return; } catch (err) { if (err?.name === 'AbortError') return; }
    }
    copyLink();
  };
  const shareText = async () => {
    const result = await shareOutline(outline);
    if (result === 'copied') toast('Outline copied. Paste it into a message or email.');
    else if (result === 'failed') toast('Couldn’t share or copy the outline.', { tone: 'error' });
  };

  return (
    <Sheet open={open} onClose={onClose} title="Share this outline">
      <h3 className="text-sm font-medium">Read-only link</h3>
      <p className="mb-3 mt-1 text-xs text-[var(--r-sub)]">
        Anyone with the link can read this study’s outlines (the whole-study one and each chunk’s), and print them. They can’t edit anything, and they can’t see your notes or scripts. No account needed.
      </p>
      {link.state === 'loading' && <p className="text-sm text-[var(--r-sub)]">Checking…</p>}
      {link.state === 'unavailable' && (
        <p className="rounded-xl border border-[var(--r-line)] px-3 py-2 text-sm text-[var(--r-sub)]">Links need your account and a connection to the server. You can still share the text below.</p>
      )}
      {link.state === 'ready' && (link.token ? (
        <div className="space-y-2">
          <div className="flex items-center gap-2">
            <input readOnly aria-label="Outline link" value={link.url} onFocus={(e) => e.target.select()}
              className="min-w-0 flex-1 truncate rounded-lg border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-2 text-xs text-[var(--r-sub)]" />
            <button type="button" onClick={copyLink} className="shrink-0 rounded-lg bg-[var(--r-accent)] px-4 py-2 text-xs font-medium text-[var(--r-on)]">{copied ? 'Copied!' : 'Copy'}</button>
          </div>
          <div className="flex flex-wrap items-center gap-3">
            <button type="button" onClick={shareLink} className={btn}>Share link…</button>
            <button type="button" onClick={link.turnOff} disabled={link.busy} className="text-xs text-[var(--r-danger,#b42318)] hover:underline">{link.busy ? 'Turning off…' : 'Turn off link'}</button>
          </div>
          <p className="text-[11px] text-[var(--r-sub)]">People see the version that last synced to your account, and it updates as you edit. Turning the link off stops it working right away.</p>
        </div>
      ) : (
        <button type="button" onClick={link.create} disabled={link.busy} className="rounded-xl bg-[var(--r-accent)] px-4 py-2 text-sm font-medium text-[var(--r-on)] hover:opacity-90 disabled:opacity-50">{link.busy ? 'Creating…' : 'Create read-only link'}</button>
      ))}
      {link.error && <p role="alert" className="mt-2 text-xs text-[var(--r-danger,#b42318)]">{link.error}</p>}

      <div className="mt-5 border-t border-[var(--r-line)] pt-4">
        <h3 className="text-sm font-medium">Or send the text</h3>
        <p className="mb-2 mt-1 text-xs text-[var(--r-sub)]">The outline you’re looking at, as plain text, to paste into a message or email.</p>
        <button type="button" onClick={shareText} className={btn}>Share as text</button>
      </div>
    </Sheet>
  );
}