import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Button, Card, Center, Icon, Sheet, Spinner, Steps } from '@barev/ui';
import { confirmDialog, dateKeyToDate, errorText, haptic, navigate, nextDays, paramsExtras, useI18n, useToast, useTRPC } from '@barev/web';
import { useMemo, useState } from 'react';
import { PageHead, toneClass, useParamsSummary } from '../lib.tsx';

export function OrderDetail({ id }: { id: string }) {
  const { t, amd, dt, locale } = useI18n();
  const trpc = useTRPC();
  const qc = useQueryClient();
  const toast = useToast();
  const summary = useParamsSummary();
  const order = useQuery({ ...trpc.client.orders.get.queryOptions({ id }), refetchInterval: 15_000 });
  const preview = useQuery({ ...trpc.client.orders.cancelPreview.queryOptions({ id }), enabled: !!order.data?.active });
  const [reschedule, setReschedule] = useState(false);

  const cancel = useMutation(
    trpc.client.orders.cancel.mutationOptions({
      onSuccess: (r) => {
        haptic.ok();
        toast(r.fee > 0 ? t('client.detail.cancelledWithFee', { fee: amd(r.fee) }) : t('client.detail.cancelled'));
        void qc.invalidateQueries();
      },
      onError: (e) => toast(errorText(t, e), 'error'),
    }),
  );

  if (!order.data)
    return (
      <Center>
        <Spinner />
      </Center>
    );
  const o = order.data;

  // шкала прогресса: пройденные статусы по истории, текущий, остальные
  const passed = new Set(o.history.map((h) => h.to));
  const currentIdx = o.steps.indexOf(o.status);
  const steps =
    o.status === 'CANCELLED'
      ? [...o.steps.filter((s) => passed.has(s)).map((s) => ({ label: t(`status.${o.flow}.${s}`), state: 'done' as const })), { label: t(`status.${o.flow}.CANCELLED`), state: 'current' as const }]
      : o.steps.map((s, i) => {
          const at = o.history.find((h) => h.to === s && !h.event)?.at ?? o.history.find((h) => h.to === s)?.at;
          return {
            label: t(`status.${o.flow}.${s}`),
            state: i < currentIdx ? ('done' as const) : i === currentIdx ? ('current' as const) : ('todo' as const),
            meta: at && i <= currentIdx ? dt(at, { day: 'numeric', month: 'short', hour: '2-digit', minute: '2-digit' }) : undefined,
          };
        });
  const arrived = o.history.some((h) => h.event === 'arrived');

  async function onCancel() {
    const p = preview.data?.policy;
    if (!p) return;
    const text = p.kind === 'free' ? t('client.detail.confirmCancelFree') : p.kind === 'late' ? t('client.detail.confirmCancelLate', { fee: amd(p.fee), pct: p.feePct }) : '';
    if (await confirmDialog(text)) cancel.mutate({ id });
  }

  return (
    <main className="app app--plain">
      <PageHead title={`#${o.number}`} />

      <Card className={toneClass(o.category)} style={{ padding: 20 }}>
        <div className="bc-stack" style={{ gap: 8 }}>
          <div className="bc-between" style={{ alignItems: 'flex-start' }}>
            <h2 className="bc-h2">{t(`services.${o.serviceCode}.name`)}</h2>
            <span className="bc-badge">{t(`status.${o.flow}.${o.status}`)}</span>
          </div>
          <div>{summary(o.serviceCode, o.params)}</div>
          {paramsExtras(t, o.params).length > 0 && <div className="bc-small">+ {paramsExtras(t, o.params).map((e) => e.label).join(', ')}</div>}
          <div className="bc-row" style={{ fontWeight: 600 }}>
            <Icon name="clock" size={18} />
            {dt(o.scheduledAt, { weekday: 'long', day: 'numeric', month: 'long', hour: '2-digit', minute: '2-digit' })}
          </div>
          {o.addressText && (
            <div className="bc-row">
              <Icon name="pin" size={18} />
              {o.districtCode ? `${t(`districts.${o.districtCode}`)}, ` : ''}
              {o.addressText}
            </div>
          )}
          {o.providerName && (
            <div className="bc-row">
              <Icon name="user" size={18} />
              {t(`client.detail.providerLabel.${o.flow}`)}: {o.providerName}
              {arrived && o.status === 'EN_ROUTE' && <span className="bc-badge">{t('client.detail.arrived')}</span>}
            </div>
          )}
        </div>
      </Card>

      <Card>
        <h2 className="bc-h3" style={{ marginBottom: 12 }}>
          {t('client.detail.progress')}
        </h2>
        <Steps items={steps} />
      </Card>

      {o.photos.length > 0 && <PhotoReport photos={o.photos} />}

      <Card className="price-lines">
        <div className="bc-between">
          <span>{t('client.order.price')}</span>
          <span>{amd(o.basePrice)}</span>
        </div>
        {o.discountAmount > 0 && (
          <div className="bc-between" style={{ color: 'var(--bc-accent)', fontWeight: 600 }}>
            <span>{t('client.order.discount', { pct: o.discountPct })}</span>
            <span>−{amd(o.discountAmount)}</span>
          </div>
        )}
        <div className="bc-between total">
          <span>{t('client.order.total')}</span>
          <span>{amd(o.totalPrice)}</span>
        </div>
        {o.cancelFee > 0 && (
          <div className="bc-between">
            <span>{t('client.detail.cancelFee')}</span>
            <span>{amd(o.cancelFee)}</span>
          </div>
        )}
        <div className="bc-small bc-muted">
          {t(`payment.${o.paymentStatus}`)}
          {o.paymentMethod ? ` · ${o.paymentMethod.name[locale] || o.paymentMethod.name.ru}` : ''}
        </div>
      </Card>

      {o.note && (
        <Card tight>
          <div className="bc-small bc-muted">{t('client.order.note')}</div>
          <div>{o.note}</div>
        </Card>
      )}

      <div className="bc-stack" style={{ gap: 8 }}>
        {o.active && preview.data?.canReschedule && (
          <Button variant="light" block onClick={() => setReschedule(true)}>
            {t('client.detail.reschedule')}
          </Button>
        )}
        {o.active && preview.data?.cancellable && preview.data.policy.kind !== 'operator_only' && (
          <Button variant="danger" block onClick={onCancel} disabled={cancel.isPending}>
            {t('client.detail.cancel')}
          </Button>
        )}
        {o.active && preview.data && (!preview.data.cancellable || preview.data.policy.kind === 'operator_only' || !preview.data.canReschedule) && (
          <p className="bc-small bc-muted" style={{ margin: 0, textAlign: 'center' }}>
            {t('client.detail.viaOperator', { hours: preview.data.freeHours })}
          </p>
        )}
        {!o.active && o.status !== 'CANCELLED' && (
          <Button variant="dark" block onClick={() => navigate(`/order/${o.serviceCode}?repeat=${o.id}`)}>
            <Icon name="repeat" size={18} />
            {t('client.detail.repeat')}
          </Button>
        )}
        {o.status === 'CANCELLED' && (
          <Button variant="light" block onClick={() => navigate(`/order/${o.serviceCode}?repeat=${o.id}`)}>
            {t('client.detail.orderAgain')}
          </Button>
        )}
      </div>

      <RescheduleSheet open={reschedule} onClose={() => setReschedule(false)} order={o} />
    </main>
  );
}

function PhotoReport({ photos }: { photos: { code: string; fileId: string }[] }) {
  const { t } = useI18n();
  const trpc = useTRPC();
  return (
    <Card>
      <h2 className="bc-h3" style={{ marginBottom: 10 }}>
        {t('client.detail.photoReport')}
      </h2>
      <div className="photos">
        {photos.map((p) => (
          <Photo key={p.fileId} fileId={p.fileId} alt={t(`checklist.${p.code}`)} trpc={trpc} />
        ))}
      </div>
    </Card>
  );
}

function Photo({ fileId, alt, trpc }: { fileId: string; alt: string; trpc: ReturnType<typeof useTRPC> }) {
  const url = useQuery({ ...trpc.client.fileUrl.queryOptions({ fileId }), staleTime: 4 * 60_000 });
  return url.data ? (
    <a href={url.data.url} target="_blank" rel="noreferrer">
      <img src={url.data.url} alt={alt} loading="lazy" />
    </a>
  ) : (
    <div style={{ aspectRatio: 1, borderRadius: 16, background: 'var(--bc-bg)' }} />
  );
}

/** ORD-6: перенос — выбор нового слота */
function RescheduleSheet({ open, onClose, order }: { open: boolean; onClose: () => void; order: { id: string; serviceCode: string; params: Record<string, unknown> } }) {
  const { t, dt } = useI18n();
  const trpc = useTRPC();
  const qc = useQueryClient();
  const toast = useToast();
  const days = useMemo(() => nextDays(14), []);
  const [day, setDay] = useState(days[1] ?? days[0]!);
  const [slot, setSlot] = useState<Date | null>(null);
  const slots = useQuery({
    ...trpc.client.slots.queryOptions({ serviceCode: order.serviceCode, params: order.params as Record<string, string | number | boolean>, dateKey: day, excludeOrderId: order.id }),
    enabled: open,
  });
  const mutate = useMutation(
    trpc.client.orders.reschedule.mutationOptions({
      onSuccess: () => {
        toast(t('client.detail.rescheduled'));
        void qc.invalidateQueries();
        onClose();
      },
      onError: (e) => toast(errorText(t, e), 'error'),
    }),
  );
  return (
    <Sheet open={open} onClose={onClose} label={t('client.detail.reschedule')}>
      <div className="bc-stack">
        <div className="bc-between">
          <h2 className="bc-h2">{t('client.detail.reschedule')}</h2>
          <button className="back" onClick={onClose} aria-label={t('common.close')}>
            <Icon name="close" />
          </button>
        </div>
        <div className="days">
          {days.map((d) => (
            <button
              key={d}
              type="button"
              className="day"
              aria-pressed={d === day}
              onClick={() => {
                setDay(d);
                setSlot(null);
              }}
            >
              <span className="bc-small">{dt(dateKeyToDate(d), { weekday: 'short' })}</span>
              <span className="day__num">{dt(dateKeyToDate(d), { day: 'numeric' })}</span>
            </button>
          ))}
        </div>
        {slots.isPending ? (
          <Spinner />
        ) : slots.data?.length ? (
          <div className="slots">
            {slots.data.map((s) => (
              <button key={s.start.toISOString()} type="button" className="slot" aria-pressed={slot?.getTime() === s.start.getTime()} onClick={() => setSlot(s.start)}>
                {dt(s.start, { hour: '2-digit', minute: '2-digit' })}
              </button>
            ))}
          </div>
        ) : (
          <p className="bc-muted">{t('client.order.noSlots')}</p>
        )}
        <Button block disabled={!slot || mutate.isPending} onClick={() => slot && mutate.mutate({ id: order.id, scheduledAt: slot })}>
          {t('client.detail.rescheduleConfirm')}
        </Button>
      </div>
    </Sheet>
  );
}