---
import Pagination from 'virtual:starlight/components/Pagination';
import config from 'virtual:starlight/user-config';
import { Icon } from '@astrojs/starlight/components';
import SocialShare from '../SocialShare.astro';
import SanpiPagination from '../SanpiPagination.astro';
import { shareCaption } from '../../utils/share-caption';

const route = Astro.locals.starlightRoute;
const caption = shareCaption(
  route.entry?.slug || route.id || '',
  route.entry?.data?.title,
);

/** Date を「令和8年9月22日 11:14」の形にする（ローカル時刻） */
function toJapaneseDateTime(date: Date): string {
  const y = date.getFullYear();
  const m = date.getMonth() + 1;
  const d = date.getDate();
  let era = '昭和';
  let n = y - 1925;
  if (y > 2019 || (y === 2019 && m >= 5)) {
    era = '令和';
    n = y - 2018;
  } else if (y >= 1989) {
    era = '平成';
    n = y - 1988;
  }
  const year = n === 1 ? `${era}元年` : `${era}${n}年`;
  const hh = String(date.getHours()).padStart(2, '0');
  const mm = String(date.getMinutes()).padStart(2, '0');
  return `${year}${m}月${d}日 ${hh}:${mm}`;
}

const lastUpdated = route.lastUpdated;

// 年度別の賛否一覧はサイドバーに登録していないため、Starlight 標準の
// 前後ページは決まらない。URL から年度を判定し、前年度・次年度を渡す。
const SANPI_YEARS = [
  { key: 'r1d', label: '令和元年度の賛否一覧' },
  { key: 'r2d', label: '令和2年度の賛否一覧' },
  { key: 'r3d', label: '令和3年度の賛否一覧' },
  { key: 'r4d', label: '令和4年度の賛否一覧' },
  { key: 'r5d', label: '令和5年度の賛否一覧' },
  { key: 'r6d', label: '令和6年度の賛否一覧' },
  { key: 'r7d', label: '令和7年度の賛否一覧' },
  { key: 'r8d', label: '令和8年度の賛否一覧' },
];
const sanpiMatch = Astro.url.pathname.match(/^\/sanpi\/(r\d+d)\/?$/);
const sanpiIndex = sanpiMatch
  ? SANPI_YEARS.findIndex((year) => year.key === sanpiMatch[1])
  : -1;
const sanpiPrev =
  sanpiIndex > 0
    ? {
        href: `/sanpi/${SANPI_YEARS[sanpiIndex - 1].key}/`,
        label: SANPI_YEARS[sanpiIndex - 1].label,
      }
    : undefined;
const sanpiNext =
  sanpiIndex >= 0 && sanpiIndex < SANPI_YEARS.length - 1
    ? {
        href: `/sanpi/${SANPI_YEARS[sanpiIndex + 1].key}/`,
        label: SANPI_YEARS[sanpiIndex + 1].label,
      }
    : undefined;
---

<footer class="sl-flex">
  <SocialShare title={caption} />

  <div class="meta sl-flex">
    {
      lastUpdated && (
        <p>
          {Astro.locals.t('page.lastUpdated')}{' '}
          <time datetime={lastUpdated.toISOString()}>{toJapaneseDateTime(lastUpdated)}</time>
        </p>
      )
    }
    {
      route.editUrl && (
        <a class="edit-history sl-flex" href={route.editUrl}>
          <Icon name="code-branch" />
          {Astro.locals.t('page.editLink')}
        </a>
      )
    }
  </div>
  {
    sanpiIndex >= 0 ? (
      <SanpiPagination prev={sanpiPrev} next={sanpiNext} />
    ) : (
      <Pagination />
    )
  }

  {
    config.credits && (
      <a class="kudos sl-flex" href="https://starlight.astro.build">
        <Icon name={'starlight'} /> {Astro.locals.t('builtWithStarlight.label')}
      </a>
    )
  }
</footer>

<style>
  @layer starlight.core {
    footer {
      flex-direction: column;
      gap: 1.5rem;
    }
    .meta {
      flex-direction: column;
      align-items: flex-end;
      gap: 0.35rem;
      margin-top: 3rem;
      font-size: var(--sl-text-sm);
      color: var(--sl-color-gray-3);
    }
    .meta > :global(p) {
      margin: 0;
    }
    .edit-history {
      align-items: center;
      gap: 0.35em;
      text-decoration: none;
      color: var(--sl-color-gray-3);
    }
    .edit-history:hover {
      color: var(--sl-color-white);
    }

    .kudos {
      align-items: center;
      gap: 0.5em;
      margin: 1.5rem auto;
      font-size: var(--sl-text-xs);
      text-decoration: none;
      color: var(--sl-color-gray-3);
    }
    .kudos:hover {
      color: var(--sl-color-white);
    }
  }

  @layer starlight.components {
    .kudos :global(svg) {
      color: var(--sl-color-orange);
    }
  }
</style>