import { FEE_SCHEDULE_AS_OF, type FeeSchedule } from '@rareindex/valuation';
import { fmtMoney, fmtPct, cn } from '@/lib/format';
import { Badge, Table, th, td, tdNum } from '@/components/ui/primitives';

export function FeeConfidenceBadge({ confidence, className }: { confidence: FeeSchedule['confidence'] | 'unknown'; className?: string }) {
  const map: Record<string, { tone: 'gain' | 'index' | 'neutral' | 'alert'; label: string; title: string }> = {
    published: { tone: 'gain', label: 'Published', title: `Taken from the house's published terms as of ${FEE_SCHEDULE_AS_OF}` },
    approximate: { tone: 'index', label: '≈ Approximate', title: 'Widely reported schedule not re-verified against the current terms — every all-in figure built on it is labelled as an estimate' },
    none: { tone: 'neutral', label: 'No buyer premium', title: 'The house bills the hammer price; the seller pays the commission' },
    default: { tone: 'alert', label: 'Default 22 %', title: 'House not on file — a typical 22 % premium is applied and labelled' },
    unknown: { tone: 'alert', label: 'Unknown', title: 'No schedule on file' },
  };
  const m = map[confidence] ?? map.unknown!;
  return (
    <Badge tone={m.tone} className={className}>
      <span title={m.title}>{m.label}</span>
    </Badge>
  );
}

/** Buyer's premium schedule of one house (§35): marginal tiers, minimum/maximum, fixed fee, confidence and source. */
export function FeeScheduleTable({ schedule, className }: { schedule: FeeSchedule; className?: string }) {
  const cur = schedule.currency;
  const tiers = schedule.tiers.map((t, i) => ({ from: i === 0 ? 0 : (schedule.tiers[i - 1]!.upTo ?? 0), to: t.upTo, rate: t.rate }));
  return (
    <div className={cn('space-y-2', className)}>
      <Table>
        <thead>
          <tr>
            <th className={th}>Hammer price ({cur})</th>
            <th className={cn(th, 'text-right')}>Buyer&apos;s premium</th>
          </tr>
        </thead>
        <tbody>
          {tiers.map((t, i) => (
            <tr key={i}>
              <td className={td}>{t.to === null ? `above ${fmtMoney(t.from, cur)}` : t.from === 0 ? `up to ${fmtMoney(t.to, cur)}` : `${fmtMoney(t.from, cur)} – ${fmtMoney(t.to, cur)}`}</td>
              <td className={tdNum}>{fmtPct(t.rate, t.rate * 100 % 1 ? 1 : 0, false)}</td>
            </tr>
          ))}
          {schedule.minimum !== undefined ? (
            <tr>
              <td className={td}>Minimum premium</td>
              <td className={tdNum}>{fmtMoney(schedule.minimum, cur)}</td>
            </tr>
          ) : null}
          {schedule.maximum !== undefined ? (
            <tr>
              <td className={td}>Maximum premium</td>
              <td className={tdNum}>{fmtMoney(schedule.maximum, cur)}</td>
            </tr>
          ) : null}
          {schedule.fixedFee !== undefined ? (
            <tr>
              <td className={td}>Fixed fee per lot</td>
              <td className={tdNum}>{fmtMoney(schedule.fixedFee, cur)}</td>
            </tr>
          ) : null}
        </tbody>
      </Table>
      <p className="text-[11px] text-muted">
        <FeeConfidenceBadge confidence={schedule.confidence} className="mr-1.5" />
        Schedule as of {FEE_SCHEDULE_AS_OF}.{schedule.note ? ` ${schedule.note}` : ''} VAT or sales tax on the premium, import duties and shipping are not included.
        {schedule.source ? (
          <>
            {' '}
            <a href={schedule.source} target="_blank" rel="noopener nofollow" className="underline-offset-2 hover:underline">
              Source ↗
            </a>
          </>
        ) : null}
      </p>
    </div>
  );
}

/** One-line summary of a schedule for lists: "27 % → 15 % (3 tiers)" or "20 %". */
export function feeScheduleSummary(s: FeeSchedule): string {
  const rates = s.tiers.map((t) => fmtPct(t.rate, t.rate * 100 % 1 ? 1 : 0, false));
  const base = rates.length === 1 ? rates[0]! : `${rates[0]} → ${rates.at(-1)} (${rates.length} tiers)`;
  const extras = [s.minimum !== undefined ? `min ${fmtMoney(s.minimum, s.currency)}` : null, s.maximum !== undefined ? `cap ${fmtMoney(s.maximum, s.currency)}` : null, s.fixedFee !== undefined ? `+ ${fmtMoney(s.fixedFee, s.currency)}/lot` : null].filter(Boolean);
  return extras.length ? `${base} · ${extras.join(' · ')}` : base;
}