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

/// Every post from every subscribed site in one list (spec 6.1), newest first
/// unless the reader orders it otherwise. Unread posts stand out, and opening
/// one marks it read.
Future<MewsPage> buildPostsPage(
  Uri url, {
  required MewsDatabase db,
  required Strings strings,
  required bool refreshing,
}) async {
  final sort = EntrySort.parse(url.queryParameters['sort']);
  final unreadOnly = url.queryParameters['show'] == 'unread';
  final entries =
      await db.riverEntries(sort: sort, unreadOnly: unreadOnly);
  final unread = await db.unreadCount();
  final title = strings.t('posts-title');

  return internalPage(
    url: url,
    title: title,
    strings: strings,
    body: [
      ...chrome(title: title, current: url, strings: strings),
      ParagraphBlock([
        MewsEmphasis(EmphasisStyle.emphasis, [
          MewsText(countText(strings, unread,
              none: 'count-unread-none',
              one: 'count-unread-one',
              many: 'count-unread-many')),
        ]),
        const MewsText(actionSeparator),
        if (refreshing)
          MewsEmphasis(EmphasisStyle.emphasis,
              [MewsText(strings.t('posts-checking'))])
        else
          MewsLink(MewsUrls.action('refresh-subscriptions'),
              [MewsText(strings.t('action-refresh'))]),
      ]),
      ...choiceLine(
        label: strings.t('posts-sort-label'),
        options: [
          for (final option in const [
            (EntrySort.date, 'posts-sort-date'),
            (EntrySort.source, 'posts-sort-source'),
            (EntrySort.unread, 'posts-sort-unread'),
          ])
            (
              href: MewsUrls.page(url, {'sort': option.$1.name}),
              label: strings.t(option.$2),
              current: option.$1 == sort,
            ),
        ],
      ),
      ...choiceLine(
        label: strings.t('posts-show-label'),
        options: [
          (
            href: MewsUrls.page(url, {'show': null}),
            label: strings.t('posts-show-all'),
            current: !unreadOnly,
          ),
          (
            href: MewsUrls.page(url, {'show': 'unread'}),
            label: strings.t('posts-show-unread'),
            current: unreadOnly,
          ),
        ],
      ),
      const RuleBlock(),
      if (entries.isEmpty)
        ParagraphBlock([
          MewsText(strings
              .t(unreadOnly ? 'posts-none-unread' : 'posts-empty')),
        ])
      else
        itemList([
          for (final entry in entries)
            itemRow(
              href: entry.url,
              label: entry.title,
              date: dayText(entry.date),
              note: entry.siteName,
              strong: entry.unread,
              actions: [
                if (entry.unread)
                  action(
                      MewsUrls.action('mark-read',
                          {'site': entry.siteUrl, 'url': entry.url}),
                      strings.t('posts-mark-read'))
                else
                  action(
                      MewsUrls.action('mark-unread',
                          {'site': entry.siteUrl, 'url': entry.url}),
                      strings.t('posts-mark-unread')),
              ],
            ),
        ]),
    ],
  );
}