import '../../database/database.dart';
import '../../l10n/strings.dart';
import '../../mews/document.dart';
import 'mews_urls.dart';
import 'page_blocks.dart';

/// The reader's certificates, worn as identities on Gemini sites that ask for
/// one. An identity is added from a PEM file, renamed in place, and removed
/// in a second step when it is worn anywhere, because the sites that know it
/// lose it with the removal.
Future<MewsPage> buildCertificatesPage(
  Uri url, {
  required MewsDatabase db,
  required Strings strings,
}) async {
  final title = strings.t('certificates-title');
  final held = await db.allClientCertificates();

  final body = <MewsBlock>[
    ...chrome(title: title, current: url, strings: strings),
    ParagraphBlock([
      MewsLink(MewsUrls.action('import-certificate'), [
        MewsText(strings.t('certificates-add')),
      ]),
    ]),
  ];

  // Removing an identity takes a second step, like clearing history: the
  // sites it is worn at stop seeing it too, and that cannot be undone.
  final forgetting = int.tryParse(url.queryParameters['forget'] ?? '');
  final row = forgetting == null ? null : await db.clientCertificate(forgetting);
  if (row != null) {
    body.addAll([
      HeadingBlock(2, [MewsText(row.name)]),
      ParagraphBlock([MewsText(strings.t('certificates-delete-confirm'))]),
      ...linkLine([
        action(
            MewsUrls.action('delete-certificate', {'id': '${row.id}'}),
            strings.t('certificates-delete-yes')),
        action(MewsUrls.certificates, strings.t('certificates-delete-no')),
      ]),
    ]);
  }

  if (held.isEmpty) {
    body.add(ParagraphBlock([MewsText(strings.t('certificates-empty'))]));
  } else {
    final rows = <MewsListItem>[];
    for (final certificate in held) {
      final worn = await db.bindingsOf(certificate.id);
      rows.add(MewsListItem([
        ParagraphBlock([
          MewsEmphasis(EmphasisStyle.strong, [MewsText(certificate.name)]),
          if (worn.isNotEmpty) ...[
            const MewsLineBreak(),
            MewsEmphasis(
              EmphasisStyle.emphasis,
              [
                MewsText(worn
                    .map((host) => strings.t('certificates-bound-to', {'host': host}))
                    .join(actionSeparator)),
              ],
            ),
          ],
          const MewsLineBreak(),
          MewsLink(MewsUrls.page(url, {'forget': '${certificate.id}'}),
              [MewsText(strings.t('certificates-remove'))]),
        ]),
        textForm(
          action: MewsUrls.action('rename-certificate', {'id': '${certificate.id}'}),
          field: 'name',
          label: strings.t('certificates-rename-label'),
          submitLabel: strings.t('certificates-rename-submit'),
          value: certificate.name,
        ),
      ]));
    }
    body.add(itemList(rows));
  }

  return internalPage(url: url, title: title, body: body, strings: strings);
}