import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Button, Card, Field } from '@barev/ui';
import { errorText, haptic, useI18n, useToast, useTRPC } from '@barev/web';
import { useState } from 'react';

const WHEN = ['month', 'quarter', 'later', 'date'] as const;
const PACKAGES = ['CONSULT', 'TURNKEY', 'CUSTOM'] as const;
const YES_NO = ['flat', 'registration', 'socialCard', 'bankCard', 'residence'] as const;
type When = (typeof WHEN)[number];
type Pkg = (typeof PACKAGES)[number];

/** Конструктор переезда в приложении: когда, какой пакет, что нужно. После отправки — план по шагам */
export function MoveForm() {
  const { t, amd } = useI18n();
  const trpc = useTRPC();
  const qc = useQueryClient();
  const toast = useToast();
  const me = useQuery(trpc.client.me.queryOptions());
  const [when, setWhen] = useState<When | null>(null);
  const [date, setDate] = useState('');
  const [pkg, setPkg] = useState<Pkg | null>(null);
  const [airport, setAirport] = useState<'none' | 'standard' | 'premium'>('standard');
  const [stay, setStay] = useState<'none' | 'flat' | 'hotel'>('hotel');
  const [budgetFrom, setBudgetFrom] = useState('');
  const [budgetTo, setBudgetTo] = useState('');
  const [yes, setYes] = useState<Record<(typeof YES_NO)[number], boolean>>({ flat: true, registration: true, socialCard: true, bankCard: false, residence: false });
  const [comment, setComment] = useState('');
  const [error, setError] = useState<string | null>(null);

  const create = useMutation(
    trpc.client.relocation.create.mutationOptions({
      onSuccess: () => {
        haptic.ok();
        toast(t('client.move.created'));
        void qc.invalidateQueries();
        window.scrollTo({ top: 0 });
      },
      onError: (e) => toast(errorText(t, e), 'error'),
    }),
  );

  function submit() {
    if (!when || (when === 'date' && !date)) return setError(t('client.move.errWhen'));
    if (!pkg) return setError(t('client.move.errPackage'));
    const any = airport !== 'none' || stay !== 'none' || YES_NO.some((k) => yes[k]);
    if (pkg === 'CUSTOM' && !any) return setError(t('client.move.errEmpty'));
    setError(null);
    const num = (v: string) => (v ? Number(v) : undefined);
    create.mutate({
      moveWhen: when,
      moveDate: when === 'date' ? date : undefined,
      package: pkg,
      options: pkg === 'CUSTOM' ? { airport, stay, stayBudgetFrom: stay === 'none' ? undefined : num(budgetFrom), stayBudgetTo: stay === 'none' ? undefined : num(budgetTo), ...yes } : undefined,
      comment: comment.trim() || undefined,
    });
  }

  const seg = <V extends string>(value: V, options: readonly V[], label: (v: V) => string, onChange: (v: V) => void) => (
    <div className="mf-seg" role="radiogroup">
      {options.map((o) => (
        <button key={o} type="button" role="radio" aria-checked={value === o} onClick={() => onChange(o)}>
          {label(o)}
        </button>
      ))}
    </div>
  );

  return (
    <main className="app app--hero">
      <section className="hero move-hero">
        <div className="move-hero__label">{me.data?.firstName ? t('client.move.formHello', { name: me.data.firstName }) : t('client.move.title')}</div>
        <div className="move-hero__when">{t('client.move.formTitle')}</div>
        <div className="move-hero__progress">{t('client.move.formSub')}</div>
      </section>

      <Card className="bc-stack">
        <h2 className="bc-h3">{t('client.move.whenTitle')}</h2>
        <div className="mf-choices">
          {WHEN.map((w) => (
            <button key={w} type="button" className="mf-choice" aria-pressed={when === w} onClick={() => setWhen(w)}>
              {t(`landing.quiz.when_${w}`)}
            </button>
          ))}
        </div>
        {when === 'date' && (
          <Field label={t('landing.quiz.date')}>
            <input className="bc-input" type="date" min={new Date().toISOString().slice(0, 10)} value={date} onChange={(e) => setDate(e.target.value)} />
          </Field>
        )}
      </Card>

      <Card className="bc-stack">
        <h2 className="bc-h3">{t('client.move.packageTitle')}</h2>
        {PACKAGES.map((p) => (
          <button key={p} type="button" className="mf-package" aria-pressed={pkg === p} onClick={() => setPkg(p)}>
            <span className="bc-between" style={{ alignItems: 'baseline', gap: 10 }}>
              <b>{t(`landing.quiz.package_${p}`)}</b>
              {p === 'CONSULT' && me.data && <span className="mf-price">{amd(me.data.plans.consultation)}</span>}
              {p === 'TURNKEY' && <span className="mf-price">{t('landing.quiz.package_TURNKEY_price')}</span>}
            </span>
            <span className="bc-small">{t(`landing.quiz.package_${p}_text`)}</span>
          </button>
        ))}
      </Card>

      {pkg === 'CUSTOM' && (
        <Card className="bc-stack">
          <h2 className="bc-h3">{t('client.move.customTitle')}</h2>
          <div className="mf-row">
            <span>{t('landing.quiz.airport')}</span>
            {seg(airport, ['none', 'standard', 'premium'] as const, (v) => t(`landing.quiz.airport_${v}`), setAirport)}
          </div>
          <div className="mf-row">
            <span>{t('landing.quiz.stay')}</span>
            {seg(stay, ['none', 'flat', 'hotel'] as const, (v) => t(`landing.quiz.stay_${v}`), setStay)}
          </div>
          {stay !== 'none' && (
            <div className="mf-budget">
              <Field label={`${t('landing.quiz.budget')} · ${t('landing.quiz.budgetFrom')}`}>
                <input className="bc-input" inputMode="numeric" value={budgetFrom} placeholder="20 000" onChange={(e) => setBudgetFrom(e.target.value.replace(/\D/g, '').slice(0, 7))} />
              </Field>
              <Field label={t('landing.quiz.budgetTo')}>
                <input className="bc-input" inputMode="numeric" value={budgetTo} placeholder="40 000" onChange={(e) => setBudgetTo(e.target.value.replace(/\D/g, '').slice(0, 7))} />
              </Field>
            </div>
          )}
          {YES_NO.map((k) => (
            <div key={k} className="mf-row">
              <span>{t(`landing.quiz.${k}`)}</span>
              {seg(yes[k] ? 'yes' : 'no', ['no', 'yes'] as const, (v) => t(`landing.quiz.${v}`), (v) => setYes({ ...yes, [k]: v === 'yes' }))}
            </div>
          ))}
        </Card>
      )}

      <Card className="bc-stack">
        <Field label={t('client.move.comment')}>
          <textarea className="bc-input" style={{ minHeight: 80 }} maxLength={1000} value={comment} placeholder={t('client.move.commentHint')} onChange={(e) => setComment(e.target.value)} />
        </Field>
        {error && (
          <p role="alert" style={{ margin: 0, color: 'var(--bc-danger)', fontWeight: 600 }}>
            {error}
          </p>
        )}
        <Button onClick={submit} disabled={create.isPending}>
          {create.isPending ? t('landing.quiz.sending') : t('client.move.submit')}
        </Button>
      </Card>
    </main>
  );
}