import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { LOCALES } from '@barev/i18n';
import { Badge, Button, Card, Field } from '@barev/ui';
import QRCode from 'qrcode';
import { confirmDialog, errorText, useI18n, useToast, useTRPC } from '@barev/web';
import { Fragment, useEffect, useState } from 'react';

const CATEGORIES = ['cafe', 'restaurant', 'shop', 'beauty', 'other'] as const;
type Draft = { id?: string; category: (typeof CATEGORIES)[number]; name: string; offer: Record<string, string>; address: string; active: boolean };
const EMPTY: Draft = { category: 'cafe', name: '', offer: { ru: '', en: '', zh: '', hy: '', es: '' }, address: '', active: true };

/** Партнёры клуба: что получает клиент по клубной карте — показывается в приложении на вкладке «Скидки» */
export function Partners() {
  const { t, locale } = useI18n();
  const trpc = useTRPC();
  const qc = useQueryClient();
  const toast = useToast();
  const list = useQuery(trpc.admin.partners.list.queryOptions());
  const [d, setD] = useState<Draft | null>(null);
  const [open, setOpen] = useState<string | null>(null);
  const save = useMutation(
    trpc.admin.partners.save.mutationOptions({
      onSuccess: () => {
        toast(t('admin.saved'));
        setD(null);
        void qc.invalidateQueries();
      },
      onError: (e) => toast(errorText(t, e), 'error'),
    }),
  );
  return (
    <>
      <div className="bc-between">
        <h1 className="bc-h2">{t('admin.nav.partners')}</h1>
        <Button size="sm" onClick={() => setD(EMPTY)}>
          {t('admin.add')}
        </Button>
      </div>
      {d && (
        <Card className="form-grid">
          <Field label={t('admin.partners.name')}>
            <input className="bc-input" value={d.name} onChange={(e) => setD({ ...d, name: e.target.value })} />
          </Field>
          <Field label={t('admin.partners.category')}>
            <select className="bc-input" value={d.category} onChange={(e) => setD({ ...d, category: e.target.value as Draft['category'] })}>
              {CATEGORIES.map((c) => (
                <option key={c} value={c}>
                  {t(`client.partners.cat.${c}`)}
                </option>
              ))}
            </select>
          </Field>
          {LOCALES.map((l) => (
            <Field key={l} label={`${t('admin.partners.offer')} · ${l.toUpperCase()}`}>
              <input className="bc-input" value={d.offer[l] ?? ''} placeholder={l === 'ru' ? '−15% на всё меню' : ''} onChange={(e) => setD({ ...d, offer: { ...d.offer, [l]: e.target.value } })} />
            </Field>
          ))}
          <Field label={t('admin.partners.address')}>
            <input className="bc-input" value={d.address} onChange={(e) => setD({ ...d, address: e.target.value })} />
          </Field>
          <label className="bc-row">
            <input type="checkbox" checked={d.active} onChange={(e) => setD({ ...d, active: e.target.checked })} /> {t('admin.active')}
          </label>
          <div className="full bc-row">
            <Button
              disabled={!d.name.trim() || !d.offer.ru?.trim()}
              onClick={() => save.mutate({ ...d, address: d.address.trim() || null, offer: { ru: d.offer.ru ?? '', en: d.offer.en ?? '', zh: d.offer.zh ?? '', hy: d.offer.hy ?? '', es: d.offer.es ?? '' } })}
            >
              {t('admin.save')}
            </Button>
            <Button variant="light" onClick={() => setD(null)}>
              {t('common.cancel')}
            </Button>
          </div>
        </Card>
      )}
      <table className="grid">
        <thead>
          <tr>
            <th>{t('admin.partners.name')}</th>
            <th>{t('admin.partners.offer')}</th>
            <th>{t('admin.partners.address')}</th>
            <th />
          </tr>
        </thead>
        <tbody>
          {list.data?.map((p) => {
            const offer = p.offer as Record<string, string>;
            return (
              <Fragment key={p.id}>
              <tr style={{ opacity: p.active ? 1 : 0.5 }}>
                <td>
                  <b>{p.name}</b>
                  <div className="bc-small bc-muted">{t(`client.partners.cat.${p.category}`)}</div>
                  <div className="bc-small bc-muted">
                    {t('admin.partners.summary', { offers: p.offers.length, members: p.members.length, visits: p._count.usages })}
                  </div>
                </td>
                <td>{offer[locale] || offer.ru}</td>
                <td className="bc-small">{p.address ?? '—'}</td>
                <td>
                  <div className="bc-chips">
                    <Button size="sm" variant="light" onClick={() => setOpen(open === p.id ? null : p.id)}>
                      {t('admin.partners.manage')}
                    </Button>
                    <Button size="sm" variant="ghost" onClick={() => setD({ id: p.id, category: p.category as Draft['category'], name: p.name, offer, address: p.address ?? '', active: p.active })}>
                      {t('admin.edit')}
                    </Button>
                  </div>
                </td>
              </tr>
              {open === p.id && (
                <tr>
                  <td colSpan={4} style={{ background: 'var(--bc-bg)' }}>
                    <PartnerDetails partner={p} />
                  </td>
                </tr>
              )}
              </Fragment>
            );
          })}
        </tbody>
      </table>
    </>
  );
}

type Offer = { id: string; title: unknown; minLevel: 'BAREV_PLUS' | 'ELITE' | null; limit: 'NONE' | 'ONCE' | 'WEEK' | 'MONTH'; limitCount: number; active: boolean };
type OfferDraft = { id?: string; title: Record<string, string>; minLevel: Offer['minLevel']; limit: Offer['limit']; limitCount: number; active: boolean };
const LEVELS = [null, 'BAREV_PLUS', 'ELITE'] as const;
const LIMITS = ['NONE', 'ONCE', 'WEEK', 'MONTH'] as const;

/** Предложения партнёра по уровням и лимитам, ссылка для собственника, команда */
function PartnerDetails({ partner }: { partner: { id: string; offers: Offer[]; members: { id: string; role: 'OWNER' | 'STAFF'; user: { firstName: string | null; lastName: string | null; username: string | null } }[] } }) {
  const { t, locale } = useI18n();
  const trpc = useTRPC();
  const qc = useQueryClient();
  const toast = useToast();
  const [od, setOd] = useState<OfferDraft | null>(null);
  const [link, setLink] = useState<string | null>(null);
  const [qr, setQr] = useState('');
  useEffect(() => {
    if (link) void QRCode.toString(link, { type: 'svg', margin: 1 }).then(setQr);
  }, [link]);
  const done = {
    onSuccess: () => {
      toast(t('admin.saved'));
      setOd(null);
      void qc.invalidateQueries();
    },
    onError: (e: unknown) => toast(errorText(t, e), 'error'),
  };
  const saveOffer = useMutation(trpc.admin.partners.saveOffer.mutationOptions(done));
  const removeMember = useMutation(trpc.admin.partners.removeMember.mutationOptions(done));
  const owner = useMutation(trpc.admin.partners.ownerInvite.mutationOptions({ onSuccess: (r) => setLink(r.url), onError: done.onError }));
  const levelName = (l: Offer['minLevel']) => (l === 'ELITE' ? 'Barev Elite' : l === 'BAREV_PLUS' ? 'Barev+' : t('admin.partners.allMembers'));
  const limitName = (o: { limit: Offer['limit']; limitCount: number }) => t(`admin.partners.limit_${o.limit}`, { count: o.limitCount });

  return (
    <div className="bc-stack" style={{ gap: 12 }}>
      <div className="bc-between">
        <b>{t('admin.partners.offers')}</b>
        <Button size="sm" onClick={() => setOd({ title: { ru: '', en: '', zh: '', hy: '', es: '' }, minLevel: null, limit: 'NONE', limitCount: 1, active: true })}>
          {t('admin.add')}
        </Button>
      </div>
      {od && (
        <div className="form-grid" style={{ background: 'var(--bc-surface)', padding: 12, borderRadius: 16 }}>
          {LOCALES.map((l) => (
            <Field key={l} label={`${t('admin.partners.offerTitle')} · ${l.toUpperCase()}`}>
              <input className="bc-input" value={od.title[l] ?? ''} placeholder={l === 'ru' ? 'Кофе в подарок' : ''} onChange={(e) => setOd({ ...od, title: { ...od.title, [l]: e.target.value } })} />
            </Field>
          ))}
          <Field label={t('admin.partners.minLevel')}>
            <select className="bc-input" value={od.minLevel ?? ''} onChange={(e) => setOd({ ...od, minLevel: (e.target.value || null) as Offer['minLevel'] })}>
              {LEVELS.map((l) => (
                <option key={l ?? 'all'} value={l ?? ''}>
                  {levelName(l)}
                </option>
              ))}
            </select>
          </Field>
          <Field label={t('admin.partners.limit')}>
            <select className="bc-input" value={od.limit} onChange={(e) => setOd({ ...od, limit: e.target.value as Offer['limit'] })}>
              {LIMITS.map((l) => (
                <option key={l} value={l}>
                  {t(`admin.partners.limitKind_${l}`)}
                </option>
              ))}
            </select>
          </Field>
          {(od.limit === 'WEEK' || od.limit === 'MONTH') && (
            <Field label={t('admin.partners.limitCount')}>
              <input className="bc-input" type="number" min={1} max={100} value={od.limitCount} onChange={(e) => setOd({ ...od, limitCount: Number(e.target.value) || 1 })} />
            </Field>
          )}
          <label className="bc-row">
            <input type="checkbox" checked={od.active} onChange={(e) => setOd({ ...od, active: e.target.checked })} /> {t('admin.active')}
          </label>
          <div className="full bc-row">
            <Button disabled={!od.title.ru?.trim()} onClick={() => saveOffer.mutate({ ...od, partnerId: partner.id, title: { ru: od.title.ru ?? '', en: od.title.en ?? '', zh: od.title.zh ?? '', hy: od.title.hy ?? '', es: od.title.es ?? '' } })}>
              {t('admin.save')}
            </Button>
            <Button variant="light" onClick={() => setOd(null)}>
              {t('common.cancel')}
            </Button>
          </div>
        </div>
      )}
      {partner.offers.length === 0 && <p className="bc-small bc-muted" style={{ margin: 0 }}>{t('admin.partners.noOffers')}</p>}
      {partner.offers.map((o) => {
        const title = o.title as Record<string, string>;
        return (
          <div key={o.id} className="bc-between" style={{ opacity: o.active ? 1 : 0.5 }}>
            <span>
              <b>{title[locale] || title.ru}</b>{' '}
              <Badge style={{ background: o.minLevel === 'ELITE' ? 'var(--bc-perks)' : o.minLevel ? 'var(--bc-pink)' : 'var(--bc-surface)' }}>{levelName(o.minLevel)}</Badge>{' '}
              <span className="bc-small bc-muted">{limitName(o)}</span>
            </span>
            <Button size="sm" variant="ghost" onClick={() => setOd({ id: o.id, title: { ...title }, minLevel: o.minLevel, limit: o.limit, limitCount: o.limitCount, active: o.active })}>
              {t('admin.edit')}
            </Button>
          </div>
        );
      })}

      <div className="bc-between" style={{ marginTop: 6 }}>
        <b>{t('admin.partners.team')}</b>
        <Button size="sm" variant="outline" onClick={() => owner.mutate({ partnerId: partner.id })}>
          {t('admin.partners.ownerLink')}
        </Button>
      </div>
      {link && (
        <div className="bc-row" style={{ alignItems: 'flex-start', gap: 14 }}>
          <div style={{ width: 160, height: 160, background: '#fff', borderRadius: 12, padding: 6 }} dangerouslySetInnerHTML={{ __html: qr }} />
          <div className="bc-stack" style={{ gap: 6, flex: 1 }}>
            <span className="bc-small">{t('admin.partners.ownerLinkHint')}</span>
            <input className="bc-input mono" readOnly value={link} onFocus={(e) => e.target.select()} />
          </div>
        </div>
      )}
      {partner.members.length === 0 && <p className="bc-small bc-muted" style={{ margin: 0 }}>{t('admin.partners.noTeam')}</p>}
      {partner.members.map((m) => (
        <div key={m.id} className="bc-between">
          <span>
            <b>
              {m.user.firstName} {m.user.lastName ?? ''}
            </b>
            {m.user.username && <span className="bc-small bc-muted"> @{m.user.username}</span>}
            <span className="bc-small bc-muted"> · {t(m.role === 'OWNER' ? 'pro.partner.owner' : 'pro.partner.staff')}</span>
          </span>
          <Button size="sm" variant="ghost" onClick={async () => (await confirmDialog(t('admin.partners.removeConfirm'))) && removeMember.mutate({ memberId: m.id })}>
            {t('pro.partner.remove')}
          </Button>
        </div>
      ))}
    </div>
  );
}