import { useQuery } from '@tanstack/react-query';
import { Link } from 'react-router-dom';
import type { AttentionItem } from '../../../../../packages/api-contracts/src/index.js';
import { AccountOwnerBadge } from '../../components/account-owner-badge.js';
import { formatExactTime, formatShortRelativeTime } from '../conversations/relative-time.js';
import { attentionApi } from './attention-api.js';
import './attention.css';

function relativeTime(timestamp: number, now: number) {
  return (
    <time dateTime={new Date(timestamp).toISOString()} title={formatExactTime(timestamp)}>
      {formatShortRelativeTime(timestamp, now)}
    </time>
  );
}

function actionHint(kind: AttentionItem['kind']): string {
  switch (kind) {
    case 'account-login-required':
      return 'No linked conversation — check Settings.';
    case 'account-unestablished':
      return 'No linked conversation — check Accounts.';
    case 'runtime-failed':
    case 'invitation-cooldown':
    default:
      return 'No linked conversation — check Operations.';
  }
}

function itemAction(item: AttentionItem) {
  if (!item.conversationId) return <span className="attention-item-hint">{actionHint(item.kind)}</span>;
  return <Link className="button secondary" to={`/conversations/${encodeURIComponent(item.conversationId)}`}>Open conversation</Link>;
}

export function AttentionPage() {
  const query = useQuery({ queryKey: ['attention'], queryFn: attentionApi.getAttention, refetchInterval: 30_000 });
  if (query.isPending) return <div className="page-state" role="status">Loading attention inbox…</div>;
  if (query.isError) return <div className="page-state error-state" role="alert"><strong>Attention inbox unavailable</strong><span>{query.error.message}</span><button className="button secondary" onClick={() => void query.refetch()} type="button">Retry</button></div>;
  const now = Date.now();
  const critical = query.data.items.filter((item) => item.severity === 'critical').length;
  return (
    <div className="page attention-page">
      <header className="page-header">
        <div>
          <span className="eyebrow">Operator queue</span>
          <h1>Needs attention</h1>
          <p>Boundaries, human handoffs, delivery failures, account problems, and Reddit cooldowns in one actionable inbox.</p>
        </div>
        <div className="attention-refresh">
          <button
            aria-busy={query.isFetching || undefined}
            className="button secondary"
            disabled={query.isFetching}
            onClick={() => void query.refetch()}
            type="button"
          >
            {query.isFetching ? 'Refreshing…' : 'Refresh'}
          </button>
          <span className="attention-refresh-note">Auto-refreshes every 30s</span>
        </div>
      </header>
      <section aria-label="Attention totals" className="status-strip">
        <div>
          <span aria-hidden="true" className={`attention-status-dot ${query.data.items.length === 0 ? 'is-clear' : 'is-open'}`} />
          <div><small>Open items</small><strong>{query.data.items.length}</strong></div>
        </div>
        <span className={critical > 0 ? 'pill danger' : 'pill success'}>{critical} critical</span>
        <span className="status-note">Updated {relativeTime(query.data.generatedAt, now)}</span>
      </section>
      {query.data.items.length === 0 ? <div className="empty-state panel"><strong>Nothing needs attention.</strong><span>Automation and account health have no outstanding operator items.</span></div> : (
        <ol aria-label="Attention items" className="attention-list">{query.data.items.map((item) => (
          <li className={`attention-item is-${item.severity}`} key={item.id}>
            <div className="attention-item-heading">
              <div>
                <span className={`pill ${item.severity === 'critical' ? 'danger' : 'warning'}`}>{item.kind.replaceAll('-', ' ')}</span>
                <h2>{item.title}</h2>
              </div>
              {relativeTime(item.occurredAt, now)}
            </div>
            <p>{item.detail}</p>
            {item.owner ? <AccountOwnerBadge owner={item.owner} /> : null}
            {itemAction(item)}
          </li>
        ))}</ol>
      )}
    </div>
  );
}