import { Link } from 'react-router-dom';
import { SkeletonBlock } from '@/shared/ui/SkeletonBlock';
import type { BrokerAccount, BrokerMoney, BrokerPortfolio } from '@/shared/api/responses';
import { buildBrokerAllocation } from '@/entities/broker-position';
import { BrokerAllocationBar } from '@/widgets/broker-allocation-chart';

function formatBrokerCurrencyValue(currency: string, value: number): string {
  return new Intl.NumberFormat('ru-RU', {
    style: 'currency',
    currency: currency || 'RUB',
    maximumFractionDigits: 2,
  }).format(value);
}

function formatBrokerMoney(value: BrokerMoney | null | undefined): string {
  if (!value) {
    return '—';
  }

  return formatBrokerCurrencyValue(value.currency, value.value);
}

function formatBrokerSignedCurrencyValue(currency: string, value: number | null): string {
  if (value === null) {
    return '—';
  }

  const formatted = formatBrokerCurrencyValue(currency, Math.abs(value));

  if (value > 0) {
    return `+${formatted}`;
  }

  if (value < 0) {
    return `−${formatted}`;
  }

  return formatted;
}

function formatBrokerSignedPercent(value: number | null): string {
  if (value === null) {
    return '—';
  }

  const formatted = `${new Intl.NumberFormat('ru-RU', {
    maximumFractionDigits: 2,
  }).format(Math.abs(value))}%`;

  if (value > 0) {
    return `+${formatted}`;
  }

  if (value < 0) {
    return `−${formatted}`;
  }

  return formatted;
}

function formatBrokerDate(value: string | null | undefined): string | null {
  if (!value) {
    return null;
  }

  return new Date(value).toLocaleDateString('ru-RU');
}

function brokerAccountTypeLabel(type: 'brokerage' | 'iis'): string {
  return type === 'iis' ? 'ИИС' : 'Брокерский счёт';
}

function BrokerAccountCardSkeleton({ name, typeLabel }: { name: string; typeLabel: string }) {
  return (
    <article className="broker-account-card broker-account-card--loading" aria-busy="true">
      <div className="broker-account-card__header">
        <div>
          <p className="broker-account-card__eyebrow">{typeLabel}</p>
          <h2 className="broker-account-card__title">{name}</h2>
        </div>
      </div>
      <div className="broker-account-card__grid">
        {[1, 2, 3, 4].map((item) => (
          <div className="broker-account-card__stat" key={item}>
            <SkeletonBlock height={12} width="50%" />
            <SkeletonBlock height={24} width="75%" />
          </div>
        ))}
      </div>
      <SkeletonBlock height={16} width="100%" borderRadius={999} />
      <SkeletonBlock height={16} width="65%" />
    </article>
  );
}

function BrokerAccountCardError({
  account,
  onRetry,
}: {
  account: BrokerAccount;
  onRetry: () => void;
}) {
  return (
    <article className="broker-account-card broker-account-card--error">
      <div className="broker-account-card__header">
        <div>
          <p className="broker-account-card__eyebrow">{brokerAccountTypeLabel(account.type)}</p>
          <h2 className="broker-account-card__title">{account.name}</h2>
        </div>
      </div>
      <div className="broker-account-card__alert" role="alert">
        <p>Не удалось загрузить данные счёта</p>
        <button className="broker-account-card__retry" type="button" onClick={onRetry}>
          Повторить
        </button>
      </div>
    </article>
  );
}

function BrokerAccountCardSuccess({
  account,
  portfolio,
}: {
  account: BrokerAccount;
  portfolio: BrokerPortfolio;
}) {
  const typeLabel = brokerAccountTypeLabel(account.type);
  const openedAt = formatBrokerDate(account.openedAt);
  const allocation = buildBrokerAllocation(portfolio);

  return (
    <Link
      className="broker-account-card broker-account-card--link"
      to={`/broker/${encodeURIComponent(account.id)}`}
    >
      <div className="broker-account-card__header">
        <div>
          <p className="broker-account-card__eyebrow">{typeLabel}</p>
          <h2 className="broker-account-card__title">{account.name}</h2>
        </div>
        {openedAt ? <p className="broker-account-card__opened">Открыт {openedAt}</p> : null}
      </div>

      <div className="broker-account-card__grid">
        <div className="broker-account-card__stat broker-account-card__stat--wide">
          <span>Стоимость</span>
          <strong>{formatBrokerMoney(portfolio.totals.portfolio)}</strong>
        </div>
        <div className="broker-account-card__stat">
          <span>За день</span>
          <strong>
            {formatBrokerSignedCurrencyValue(
              portfolio.totals.portfolio?.currency ?? 'RUB',
              portfolio.yields.daily?.value ?? null,
            )}
          </strong>
        </div>
        <div className="broker-account-card__stat">
          <span>Дневная динамика</span>
          <strong>{formatBrokerSignedPercent(portfolio.yields.dailyPercent)}</strong>
        </div>
        <div className="broker-account-card__stat">
          <span>Ожидаемая доходность</span>
          <strong>{formatBrokerSignedPercent(portfolio.yields.expectedPercent)}</strong>
        </div>
      </div>

      <BrokerAllocationBar title={`Структура счёта ${account.name}`} items={allocation.sectors} />
    </Link>
  );
}

export function BrokerAccountCard({
  account,
  portfolio,
  isLoading,
  error,
  onRetry,
}: {
  account: BrokerAccount;
  portfolio?: BrokerPortfolio;
  isLoading: boolean;
  error: Error | null;
  onRetry: () => void;
}) {
  if (isLoading && !portfolio) {
    return (
      <BrokerAccountCardSkeleton
        name={account.name}
        typeLabel={brokerAccountTypeLabel(account.type)}
      />
    );
  }

  if (error || !portfolio) {
    return <BrokerAccountCardError account={account} onRetry={onRetry} />;
  }

  return <BrokerAccountCardSuccess account={account} portfolio={portfolio} />;
}