/**
 * DashboardRecentActivity — the avatar + text + timestamp list panel
 * from the operator's redesign-v2 mockup.
 *
 * Implementation note: a user-wide activity feed API does not exist
 * yet (collection_activity is scoped per-collection). Per the
 * operator's pattern for "real metrics where available, placeholders
 * for what we don't have" (umbrella § 7.1), this component ships
 * with hardcoded demo rows and a TODO comment pointing at the
 * follow-up convoy that will land /api/user/activity.
 *
 * Once the API ships, the parent page will fetch and pass rows in
 * via the `activities` prop; the component's render code already
 * handles both real and demo shapes (same { id, actor, action,
 * subject, time } shape).
 *
 * Props:
 *   activities: array | undefined — if undefined or empty, demo rows
 *               render. If a non-empty array is passed, those rows
 *               render instead (forward-compat).
 */

const DEMO_ACTIVITIES = [
  {
    id: 'demo-1',
    actor: { name: 'StarGazer73', initial: 'S' },
    action: 'completed a trade',
    subject: '2x Astral Sage for Tideborn Explorer',
    time: '2m ago',
  },
  {
    id: 'demo-2',
    actor: { name: 'You', initial: 'Y' },
    action: 'listed a card for sale',
    subject: 'Voidforge Titan • $89.99',
    time: '18m ago',
  },
  {
    id: 'demo-3',
    actor: { name: 'Market', initial: 'M' },
    action: 'price drop alert',
    subject: 'Lumen Warden is down 12%',
    time: '1h ago',
  },
];

const ACTOR_GRADIENTS = {
  S: 'linear-gradient(135deg, rgb(120, 144, 255) 0%, rgb(80, 96, 207) 100%)',
  Y: 'linear-gradient(135deg, rgb(255, 140, 30) 0%, rgb(216, 67, 21) 100%)',
  M: 'linear-gradient(135deg, rgb(178, 102, 255) 0%, rgb(124, 58, 237) 100%)',
};

function gradientFor(initial) {
  return (
    ACTOR_GRADIENTS[initial] ??
    'linear-gradient(135deg, rgb(150, 150, 150) 0%, rgb(100, 100, 100) 100%)'
  );
}

export default function DashboardRecentActivity({ activities }) {
  const rows = activities && activities.length > 0 ? activities : DEMO_ACTIVITIES;
  const usingDemo = !activities || activities.length === 0;

  return (
    <section className="glass-panel rounded-2xl p-5 sm:p-6">
      <header className="flex items-center justify-between mb-4">
        <h2
          className="text-lg font-bold flex items-center gap-2"
          style={{ color: 'var(--text-primary)' }}
        >
          <span
            className="inline-flex h-5 w-5 items-center justify-center rounded-md"
            style={{
              background:
                'linear-gradient(135deg, rgb(255, 140, 30) 0%, rgb(216, 67, 21) 100%)',
            }}
            aria-hidden="true"
          >
            <svg
              className="h-3.5 w-3.5"
              viewBox="0 0 24 24"
              fill="rgb(255, 255, 255)"
            >
              <path d="M13 10V3L4 14h7v7l9-11h-7z" />
            </svg>
          </span>
          Recent Activity
        </h2>
        <button
          type="button"
          className="text-sm font-medium hover:underline focus:outline-none focus:ring-2 rounded-md px-1"
          style={{
            color: 'var(--accent-ember)',
            '--tw-ring-color': 'var(--accent-ember)',
          }}
        >
          View All
        </button>
      </header>

      {usingDemo && (
        <p
          className="text-xs mb-3 italic"
          style={{ color: 'var(--text-secondary)' }}
        >
          {/* TODO(user-activity-feed convoy): replace these demo rows
              with rows from GET /api/user/activity once that endpoint
              ships. Operator-approved placeholder per umbrella § 7.1. */}
          Demo activity — connect to live feed in a follow-up release.
        </p>
      )}

      <ul className="space-y-3">
        {rows.map((row) => (
          <li key={row.id} className="flex items-start gap-3">
            <div
              className="w-9 h-9 rounded-full flex items-center justify-center text-sm font-bold flex-shrink-0"
              style={{
                background: gradientFor(row.actor.initial),
                color: 'rgb(255, 255, 255)',
                boxShadow: 'inset 0 1px 0 rgba(255,255,255,0.18)',
              }}
              aria-hidden="true"
            >
              {row.actor.initial}
            </div>
            <div className="flex-1 min-w-0">
              <div
                className="text-sm"
                style={{ color: 'var(--text-primary)' }}
              >
                <span className="font-semibold">{row.actor.name}</span>{' '}
                <span style={{ color: 'var(--text-secondary)' }}>
                  {row.action}
                </span>
              </div>
              <div
                className="text-xs truncate"
                style={{ color: 'var(--text-secondary)' }}
              >
                {row.subject}
              </div>
            </div>
            <span
              className="text-xs whitespace-nowrap flex-shrink-0"
              style={{ color: 'var(--text-secondary)' }}
            >
              {row.time}
            </span>
          </li>
        ))}
      </ul>
    </section>
  );
}