Request a quote

'use client';

import { useEffect, useId, useRef, useState } from 'react';
import { cn, prefersReducedMotion, round, useLocale, useTexts } from '@/lib/kit';
import { Button } from '@/components/ui/button';
import { Icon, type IconName } from '@/components/ui/icon';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { NativeSelect } from '@/components/ui/select';
import { Slider } from '@/components/ui/slider';
import { NumberInput } from '@/components/ui/number-input';
import { FileUpload, type UploadItem } from '@/components/ui/file-upload';
import { Checkbox } from '@/components/ui/checkbox';
import { DateInput } from '@/components/ui/date-input';
import { Reveal } from '@/components/ui/reveal';
import { Section } from '@/components/ui/section';
import { Stagger } from '@/components/ui/motion';
import { ChipGroup, checkFields, DonePanel, ErrorSummary, FieldView, FlowHead, isEmail, isPhone, summaryOf, useFlowTexts, useFocusFirstError, useFormState, type DoneStep, type FieldSpec, type FlowValue, type FlowValues } from '@/components/ui/form-flow';

/*
 * Asking for a price. Each variant fits a different kind of business:
 *
 *   brief         a project brief with a budget range, deadline and files, next steps beside it
 *   line-items    a request for quotation with product lines, quantities and a delivery date
 *   by-type       the fields change with the kind of project, the form glides to the new set
 *   call-or-form  write the details or ask for a call, both short, with the reply time in view
 *
 * Every variant checks before it sends, names what is missing above the
 * form, focuses the first open field and confirms in place.
 */

export type RequestQuoteVariant = 'brief' | 'line-items' | 'by-type' | 'call-or-form';

export interface QuoteLine {
  item: string;
  quantity: number;
  unit?: string;
}

export interface QuoteType {
  value: string;
  label: string;
  icon?: IconName;
  description?: string;
  /** by-type: the extra fields for this kind */
  fields: FieldSpec[];
}

export interface RequestQuoteProps {
  variant?: RequestQuoteVariant;
  eyebrow?: React.ReactNode;
  title?: React.ReactNode;
  description?: React.ReactNode;
  /** brief: kinds of project to tap */
  topics?: string[];
  /** brief: the budget scale and a currency sign */
  budget?: { min: number; max: number; step: number; currency: string; defaultValue?: [number, number] };
  /** brief and call-or-form: what happens after sending */
  steps?: DoneStep[];
  /** brief and call-or-form: the person who answers */
  contact?: { name: string; role?: string; initials?: string; reply?: string; phone?: string };
  /** line-items: the units to pick per line and lines to start with */
  units?: string[];
  lines?: QuoteLine[];
  /** by-type: kinds of project with their own fields */
  types?: QuoteType[];
  /** call-or-form: time windows for a call */
  windows?: string[];
  submitLabel?: string;
  done?: { title: string; text?: string };
  onSubmit?: (data: Record<string, unknown>) => void;
  labels?: Partial<Texts>;
  className?: string;
}

const TEXTS = {
  en: {
    topics: 'What do you need?',
    topicsNeeded: 'Please choose at least one topic, so the right person answers.',
    budget: 'Budget',
    deadline: 'Ready by',
    details: 'Tell us about the project',
    detailsHint: 'Goals, audience, examples you like',
    detailsNeeded: 'Please describe the project in a sentence or two, it is what we price.',
    files: 'Files',
    filesHint: 'Briefs, sketches or examples, PDF or images up to 20 MB',
    name: 'Name',
    nameNeeded: 'Please tell us your name so we know who we write to.',
    company: 'Company',
    email: 'Email',
    emailNeeded: 'This address looks incomplete. Please use a form like name@example.com so the quote reaches you.',
    phone: 'Phone',
    phoneNeeded: 'Please add a number with area code, so we can call you at the time you chose.',
    send: 'Request a quote',
    next: 'What happens next',
    item: 'Product or item number',
    quantity: 'Quantity',
    unit: 'Unit',
    line: 'Line {n}',
    addLine: 'Add a line',
    removeLine: 'Remove line {n}',
    linesNeeded: 'Please name at least one product, the quote is built from these lines.',
    postcode: 'Delivery postcode',
    neededBy: 'Needed by',
    notes: 'Notes',
    notesHint: 'Delivery to the loading dock, partial deliveries and the like',
    totalLines: '{n} lines',
    totalUnits: '{n} pieces in total',
    kind: 'Kind of project',
    how: 'How should we answer?',
    write: 'Write to us',
    call: 'Call me back',
    window: 'Best time',
    windowNeeded: 'Please choose a time window, so we call when it suits you.',
    question: 'What is it about?',
    reply: 'Reply within {t}',
    consent: 'I agree that my details are used to prepare this quote.',
    consentNeeded: 'Please agree so we are allowed to use your details for the quote.',
    doneTitle: 'Thank you, your request is with us',
    doneText: 'You get the quote by email, usually within one working day.',
    callDone: 'We call you {w}',
    again: 'Start a new request',
  },
  de: {
    topics: 'Was brauchst du?',
    topicsNeeded: 'Bitte wähle mindestens ein Thema, damit die richtige Person antwortet.',
    budget: 'Budget',
    deadline: 'Fertig bis',
    details: 'Erzähl uns vom Projekt',
    detailsHint: 'Ziele, Zielgruppe, Beispiele, die dir gefallen',
    detailsNeeded: 'Bitte beschreib das Projekt in ein, zwei Sätzen, danach richtet sich der Preis.',
    files: 'Dateien',
    filesHint: 'Briefings, Skizzen oder Beispiele, PDF oder Bilder bis 20 MB',
    name: 'Name',
    nameNeeded: 'Bitte nenne uns deinen Namen, damit wir wissen, wem wir schreiben.',
    company: 'Firma',
    email: 'E-Mail',
    emailNeeded: 'Diese Adresse sieht unvollständig aus. Bitte nutze die Form name@beispiel.de, damit das Angebot dich erreicht.',
    phone: 'Telefon',
    phoneNeeded: 'Bitte gib eine Nummer mit Vorwahl an, damit wir dich zur gewählten Zeit anrufen können.',
    send: 'Angebot anfordern',
    next: 'So geht es weiter',
    item: 'Produkt oder Artikelnummer',
    quantity: 'Menge',
    unit: 'Einheit',
    line: 'Position {n}',
    addLine: 'Position hinzufügen',
    removeLine: 'Position {n} entfernen',
    linesNeeded: 'Bitte nenne mindestens ein Produkt, das Angebot entsteht aus diesen Positionen.',
    postcode: 'Lieferpostleitzahl',
    neededBy: 'Benötigt bis',
    notes: 'Hinweise',
    notesHint: 'Lieferung an die Rampe, Teillieferungen und Ähnliches',
    totalLines: '{n} Positionen',
    totalUnits: '{n} Stück insgesamt',
    kind: 'Art des Projekts',
    how: 'Wie sollen wir antworten?',
    write: 'Schreiben',
    call: 'Rückruf',
    window: 'Beste Zeit',
    windowNeeded: 'Bitte wähle ein Zeitfenster, damit wir anrufen, wenn es dir passt.',
    question: 'Worum geht es?',
    reply: 'Antwort innerhalb von {t}',
    consent: 'Ich bin einverstanden, dass meine Angaben für dieses Angebot genutzt werden.',
    consentNeeded: 'Bitte stimme zu, damit wir deine Angaben für das Angebot nutzen dürfen.',
    doneTitle: 'Danke, deine Anfrage ist bei uns',
    doneText: 'Das Angebot kommt per E-Mail, meist innerhalb eines Werktags.',
    callDone: 'Wir rufen dich an, {w}',
    again: 'Neue Anfrage starten',
  },
};

type Texts = (typeof TEXTS)['en'];

const fmtMoney = (n: number, currency: string, locale: 'en' | 'de') => {
  const num = n.toLocaleString(locale === 'de' ? 'de-DE' : 'en-US');
  return locale === 'de' ? `${num} ${currency}` : `${currency}${num}`;
};

function Done({ p, t, onAgain, title, text, className }: { p: RequestQuoteProps; t: Texts; onAgain: () => void; title?: string; text?: string; className?: string }) {
  return (
    <div className={cn('kit-card p-6 sm:p-10', className)}>
      <DonePanel
        title={title ?? p.done?.title ?? t.doneTitle}
        text={text ?? p.done?.text ?? t.doneText}
        steps={p.steps}
        actions={
          <Button variant="outline" iconLeft="rotate-ccw" onClick={onAgain}>
            {t.again}
          </Button>
        }
      />
    </div>
  );
}

function Person({ c, t, className }: { c: NonNullable<RequestQuoteProps['contact']>; t: Texts; className?: string }) {
  const initials = c.initials ?? c.name.split(' ').map((s) => s[0]).join('').slice(0, 2);
  return (
    <div className={cn('flex items-center gap-3.5', className)}>
      <span className="relative grid size-12 shrink-0 place-items-center rounded-full bg-[color-mix(in_oklab,var(--primary)_16%,var(--card))] text-[15px] font-semibold text-[color-mix(in_oklab,var(--primary)_85%,var(--foreground))]">
        {initials}
        <span className="absolute -bottom-0.5 -end-0.5 size-3.5 rounded-full border-2 border-background bg-success" />
      </span>
      <span className="min-w-0">
        <span className="block text-[15px] font-semibold text-foreground">{c.name}</span>
        {c.role && <span className="block text-[13px] text-muted-foreground">{c.role}</span>}
        {c.reply && <span className="mt-0.5 block text-[13px] text-success-foreground">{t.reply.replace('{t}', c.reply)}</span>}
      </span>
    </div>
  );
}

/** The steps after sending as a rail that fills while it scrolls into view */
function NextSteps({ steps, t }: { steps: DoneStep[]; t: Texts }) {
  return (
    <div>
      <p className="text-[13px] font-medium text-muted-foreground">{t.next}</p>
      <Stagger step={110} as="ol" className="relative mt-4 grid gap-5">
        {steps.map((s, i) => (
          <li key={s.title} className="relative flex gap-4">
            {i < steps.length - 1 && <span aria-hidden className="absolute start-[19px] top-11 h-[calc(100%-1.5rem)] w-px bg-border" />}
            <span className="grid size-10 shrink-0 place-items-center rounded-xl border border-border bg-card text-[color-mix(in_oklab,var(--primary)_85%,var(--foreground))] shadow-[var(--shadow-sm)]">
              {s.icon ? <Icon name={s.icon} size={18} /> : <span className="text-[14px] font-semibold tabular-nums">{i + 1}</span>}
            </span>
            <span className="min-w-0 pt-1">
              <span className="block text-[15px] font-medium text-foreground">{s.title}</span>
              {s.text && <span className="mt-0.5 block text-pretty text-[14px] leading-relaxed text-muted-foreground">{s.text}</span>}
            </span>
          </li>
        ))}
      </Stagger>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* brief                                                               */
/* ------------------------------------------------------------------ */

function Brief({ p, t }: { p: RequestQuoteProps; t: Texts }) {
  const id = useId();
  const locale = useLocale();
  const q = useFormState();
  const b = p.budget ?? { min: 2000, max: 40000, step: 1000, currency: '€', defaultValue: [8000, 16000] as [number, number] };
  const [topics, setTopics] = useState<string[]>([]);
  const [budget, setBudget] = useState<[number, number]>(b.defaultValue ?? [b.min, b.max]);
  const [deadline, setDeadline] = useState('');
  const [details, setDetails] = useState('');
  const [files, setFiles] = useState<UploadItem[]>([]);
  const [who, setWho] = useState({ name: '', company: '', email: '' });
  const formRef = useRef<HTMLFormElement>(null);
  const summaryRef = useRef<HTMLDivElement>(null);
  useFocusFirstError(formRef, q.attempt, summaryRef);
  const summary = summaryOf(q.errors, [
    ['topics', `${id}-topics`, t.topics],
    ['details', `${id}-details`, t.details],
    ['name', `${id}-name`, t.name],
    ['email', `${id}-email`, t.email],
  ]);

  const form = q.done ? (
    <Done p={p} t={t} onAgain={() => (setTopics([]), setDetails(''), setFiles([]), q.setDone(false))} />
  ) : (
    <form
      ref={formRef}
      noValidate
      className="kit-card grid grid-cols-1 gap-6 p-6 sm:grid-cols-2 sm:p-8"
      onSubmit={(e) => {
        e.preventDefault();
        const found: Record<string, string> = {};
        if (!topics.length) found.topics = t.topicsNeeded;
        if (!details.trim()) found.details = t.detailsNeeded;
        if (!who.name.trim()) found.name = t.nameNeeded;
        if (!isEmail(who.email)) found.email = t.emailNeeded;
        if (q.fail(found)) return;
        p.onSubmit?.({ topics, budget, deadline, details, files: files.map((f) => f.name), ...who });
        q.setDone(true);
      }}
    >
      <ErrorSummary ref={summaryRef} errors={summary} className="sm:col-span-2" />
      <ChipGroup id={`${id}-topics`} legend={t.topics} required multiple options={(p.topics ?? []).map((x) => ({ value: x, label: x }))} value={topics} onChange={(v) => (setTopics(v), q.clear('topics'))} error={q.errors.topics} className="sm:col-span-2" />
      <Slider range label={t.budget} min={b.min} max={b.max} step={b.step} value={budget} onValueChange={setBudget} format={(v) => fmtMoney(v, b.currency, locale)} className="sm:col-span-2" />
      <DateInput label={t.deadline} optional value={deadline || null} onValueChange={(v) => setDeadline(v ?? '')} />
      <div className="hidden sm:block" />
      <Textarea id={`${id}-details`} label={t.details} hint={q.errors.details ? undefined : t.detailsHint} required value={details} onChange={(e) => (setDetails(e.target.value), q.clear('details'))} error={q.errors.details} minRows={4} maxLength={2000} className="sm:col-span-2" />
      <FileUpload
        label={t.files}
        hint={t.filesHint}
        accept=".pdf,image/*"
        maxSize={20e6}
        items={files}
        onFiles={(list) => setFiles((x) => [...x, ...list.map((f, i) => ({ id: `${f.name}-${x.length + i}`, name: f.name, size: f.size, status: 'done' as const }))])}
        onRemove={(fid) => setFiles((x) => x.filter((f) => f.id !== fid))}
        className="sm:col-span-2"
      />
      <Input id={`${id}-name`} label={t.name} required autoComplete="name" value={who.name} onChange={(e) => (setWho((w) => ({ ...w, name: e.target.value })), q.clear('name'))} error={q.errors.name} />
      <Input label={t.company} optional autoComplete="organization" value={who.company} onChange={(e) => setWho((w) => ({ ...w, company: e.target.value }))} />
      <Input id={`${id}-email`} type="email" label={t.email} required autoComplete="email" value={who.email} onChange={(e) => (setWho((w) => ({ ...w, email: e.target.value })), q.clear('email'))} error={q.errors.email} className="sm:col-span-2" />
      <div className="border-t border-border pt-6 sm:col-span-2">
        <Button type="submit" icon="send" magnetic className="max-sm:w-full">
          {p.submitLabel ?? t.send}
        </Button>
      </div>
    </form>
  );

  return (
    <div className="grid grid-cols-1 gap-10 lg:grid-cols-[minmax(0,0.8fr)_minmax(0,1.2fr)] lg:gap-16">
      <div className="lg:sticky lg:top-24 lg:self-start">
        <FlowHead eyebrow={p.eyebrow} title={p.title} description={p.description} />
        {p.contact && <Person c={p.contact} t={t} className="mt-8" />}
        {/* Desktop shows the next steps here, phones and tablets after the form */}
        {p.steps && (
          <div className="mt-10 hidden border-t border-border pt-8 lg:block">
            <NextSteps steps={p.steps} t={t} />
          </div>
        )}
      </div>
      <div className="min-w-0">
        <Reveal effect="rise">{form}</Reveal>
        {p.steps && !q.done && (
          <div className="mt-10 lg:hidden">
            <NextSteps steps={p.steps} t={t} />
          </div>
        )}
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* line-items                                                          */
/* ------------------------------------------------------------------ */

function LineItems({ p, t }: { p: RequestQuoteProps; t: Texts }) {
  const id = useId();
  const locale = useLocale();
  const q = useFormState();
  const units = p.units ?? ['pcs'];
  const [lines, setLines] = useState<QuoteLine[]>(p.lines?.length ? p.lines : [{ item: '', quantity: 1, unit: units[0] }]);
  const [postcode, setPostcode] = useState('');
  const [neededBy, setNeededBy] = useState('');
  const [notes, setNotes] = useState('');
  const [who, setWho] = useState({ company: '', name: '', email: '' });
  const formRef = useRef<HTMLFormElement>(null);
  const summaryRef = useRef<HTMLDivElement>(null);
  const added = useRef(false);
  useFocusFirstError(formRef, q.attempt, summaryRef);
  useEffect(() => {
    if (!added.current) return;
    added.current = false;
    document.getElementById(`${id}-l${lines.length - 1}`)?.focus();
  }, [lines.length, id]);
  const filled = lines.filter((l) => l.item.trim());
  const pieces = filled.reduce((s, l) => s + (Number.isFinite(l.quantity) ? l.quantity : 0), 0);
  const nf = (n: number) => n.toLocaleString(locale === 'de' ? 'de-DE' : 'en-US');
  const summary = summaryOf(q.errors, [
    ['lines', `${id}-l0`, t.item],
    ['name', `${id}-name`, t.name],
    ['email', `${id}-email`, t.email],
  ]);
  const set = (i: number, patch: Partial<QuoteLine>) => setLines((x) => x.map((l, j) => (j === i ? { ...l, ...patch } : l)));

  if (q.done) return <Done p={p} t={t} onAgain={() => (setLines([{ item: '', quantity: 1, unit: units[0] }]), q.setDone(false))} className="mx-auto max-w-[56rem]" />;

  return (
    <Reveal effect="rise" className="mx-auto max-w-[60rem]">
      <form
        ref={formRef}
        noValidate
        className="kit-card overflow-hidden"
        onSubmit={(e) => {
          e.preventDefault();
          const found: Record<string, string> = {};
          if (!filled.length) found.lines = t.linesNeeded;
          if (!who.name.trim()) found.name = t.nameNeeded;
          if (!isEmail(who.email)) found.email = t.emailNeeded;
          if (q.fail(found)) return;
          p.onSubmit?.({ lines: filled, postcode, neededBy, notes, ...who });
          q.setDone(true);
        }}
      >
        <div className="grid gap-6 p-6 sm:p-8">
          <ErrorSummary ref={summaryRef} errors={summary} />
          <fieldset className="min-w-0">
            <legend className="text-[15px] font-semibold text-foreground">{t.item}</legend>
            {/* Column heads from tablet up, each line is a row; on phones each line is a small card */}
            <div aria-hidden className="mt-4 hidden grid-cols-[2rem_minmax(0,1fr)_9.5rem_8rem_2.75rem] gap-3 px-1 text-[12px] font-medium text-muted-foreground sm:grid">
              <span>#</span>
              <span>{t.item}</span>
              <span>{t.quantity}</span>
              <span>{t.unit}</span>
              <span />
            </div>
            <ol className="mt-2 grid gap-2">
              {lines.map((l, i) => (
                <li key={i} className="kit-rise grid grid-cols-[minmax(0,1fr)_2.75rem] items-start gap-2 rounded-xl border border-border bg-surface p-3 sm:grid-cols-[2rem_minmax(0,1fr)_9.5rem_8rem_2.75rem] sm:items-center sm:gap-3 sm:border-0 sm:bg-transparent sm:p-0 sm:px-1">
                  <span aria-hidden className="hidden text-[13px] font-semibold tabular-nums text-subtle-foreground sm:block">
                    {i + 1}
                  </span>
                  <Input
                    id={`${id}-l${i}`}
                    aria-label={`${t.line.replace('{n}', String(i + 1))}, ${t.item}`}
                    placeholder={t.item}
                    value={l.item}
                    invalid={i === 0 && Boolean(q.errors.lines)}
                    aria-describedby={i === 0 && q.errors.lines ? `${id}-le` : undefined}
                    onChange={(e) => (set(i, { item: e.target.value }), q.clear('lines'))}
                  />
                  <button type="button" disabled={lines.length < 2} aria-label={t.removeLine.replace('{n}', String(i + 1))} onClick={() => setLines((x) => x.filter((_, j) => j !== i))} className="grid size-11 place-items-center rounded-lg text-muted-foreground transition-colors hover:bg-[color-mix(in_oklab,var(--foreground)_6%,transparent)] hover:text-foreground focus-visible:shadow-[0_0_0_3px_color-mix(in_oklab,var(--primary)_28%,transparent)] focus-visible:outline-none disabled:opacity-30 sm:order-last">
                    <Icon name="trash" size={17} />
                  </button>
                  <div className="col-span-2 grid grid-cols-[minmax(0,1.5fr)_minmax(0,1fr)] gap-2 sm:col-span-1 sm:contents">
                    <NumberInput aria-label={`${t.line.replace('{n}', String(i + 1))}, ${t.quantity}`} variant="stepper" min={1} max={100000} value={l.quantity} onValueChange={(v) => set(i, { quantity: v })} />
                    <NativeSelect aria-label={`${t.line.replace('{n}', String(i + 1))}, ${t.unit}`} options={units.map((u) => ({ value: u, label: u }))} value={l.unit ?? units[0]} onChange={(e) => set(i, { unit: e.target.value })} />
                  </div>
                </li>
              ))}
            </ol>
            {q.errors.lines && (
              <p id={`${id}-le`} className="kit-rise mt-2 flex items-start gap-1.5 text-[13px] font-medium text-destructive">
                <Icon name="alert-circle" size={15} strokeWidth={1.8} className="mt-[2.5px] shrink-0" />
                {q.errors.lines}
              </p>
            )}
            <div className="mt-3 flex flex-wrap items-center justify-between gap-3">
              <Button
                type="button"
                variant="outline"
                size="sm"
                iconLeft="plus"
                onClick={() => {
                  added.current = true;
                  setLines((x) => [...x, { item: '', quantity: 1, unit: units[0] }]);
                }}
              >
                {t.addLine}
              </Button>
              <p aria-live="polite" className="text-[13px] tabular-nums text-muted-foreground">
                {t.totalLines.replace('{n}', nf(filled.length))} · {t.totalUnits.replace('{n}', nf(pieces))}
              </p>
            </div>
          </fieldset>
          <div className="grid grid-cols-1 gap-5 border-t border-border pt-6 sm:grid-cols-2">
            <Input label={t.postcode} optional autoComplete="postal-code" value={postcode} onChange={(e) => setPostcode(e.target.value)} />
            <DateInput label={t.neededBy} optional value={neededBy || null} onValueChange={(v) => setNeededBy(v ?? '')} />
            <Textarea label={t.notes} optional hint={t.notesHint} value={notes} onChange={(e) => setNotes(e.target.value)} minRows={2} className="sm:col-span-2" />
          </div>
          <div className="grid grid-cols-1 gap-5 border-t border-border pt-6 sm:grid-cols-3">
            <Input label={t.company} optional autoComplete="organization" value={who.company} onChange={(e) => setWho((w) => ({ ...w, company: e.target.value }))} />
            <Input id={`${id}-name`} label={t.name} required autoComplete="name" value={who.name} onChange={(e) => (setWho((w) => ({ ...w, name: e.target.value })), q.clear('name'))} error={q.errors.name} />
            <Input id={`${id}-email`} type="email" label={t.email} required autoComplete="email" value={who.email} onChange={(e) => (setWho((w) => ({ ...w, email: e.target.value })), q.clear('email'))} error={q.errors.email} />
          </div>
        </div>
        <div className="flex flex-col gap-3 border-t border-border bg-surface px-6 py-4 sm:flex-row sm:items-center sm:justify-between sm:px-8">
          <p className="text-[13px] text-muted-foreground">{p.done?.text ?? t.doneText}</p>
          <Button type="submit" icon="send" className="max-sm:w-full">
            {p.submitLabel ?? t.send}
          </Button>
        </div>
      </form>
    </Reveal>
  );
}

/* ------------------------------------------------------------------ */
/* by-type                                                             */
/* ------------------------------------------------------------------ */

function ByType({ p, t }: { p: RequestQuoteProps; t: Texts }) {
  const id = useId();
  const ft = useFlowTexts();
  const q = useFormState();
  const types = p.types ?? [];
  const [type, setType] = useState(types[0]?.value ?? '');
  const [values, setValues] = useState<FlowValues>({});
  const [who, setWho] = useState({ name: '', email: '' });
  const [dir, setDir] = useState(1);
  const fieldsRef = useRef<HTMLDivElement>(null);
  const formRef = useRef<HTMLFormElement>(null);
  const first = useRef(true);
  useFocusFirstError(formRef, q.attempt);
  const current = types.find((x) => x.value === type) ?? types[0];
  const index = types.findIndex((x) => x.value === type);
  // The new set of fields glides in from the side of the chosen tab
  useEffect(() => {
    if (first.current) {
      first.current = false;
      return;
    }
    const el = fieldsRef.current;
    if (!el || typeof el.animate !== 'function' || prefersReducedMotion()) return;
    el.animate([{ opacity: 0, transform: `translateX(${dir * 20}px)` }, { opacity: 1, transform: 'translateX(0)' }], { duration: 420, easing: 'cubic-bezier(0.2,0.7,0.2,1)' });
  }, [type, dir]);
  const pick = (v: string) => {
    setDir(types.findIndex((x) => x.value === v) >= index ? 1 : -1);
    setType(v);
    q.fail({});
  };
  if (q.done) return <Done p={p} t={t} onAgain={() => (setValues({}), q.setDone(false))} className="mx-auto max-w-[52rem]" />;
  return (
    <Reveal effect="rise" className="mx-auto max-w-[52rem]">
      <form
        ref={formRef}
        noValidate
        className="kit-card overflow-hidden"
        onSubmit={(e) => {
          e.preventDefault();
          const found = checkFields(current?.fields ?? [], values, ft);
          if (!who.name.trim()) found.__name = t.nameNeeded;
          if (!isEmail(who.email)) found.__email = t.emailNeeded;
          if (q.fail(found)) return;
          p.onSubmit?.({ type, ...values, ...who });
          q.setDone(true);
        }}
      >
        {/* Kinds of project as tabs with a sliding marker, arrow keys move between them */}
        <div role="radiogroup" aria-label={t.kind} className="relative grid border-b border-border bg-surface" style={{ gridTemplateColumns: `repeat(${types.length}, minmax(0, 1fr))` }}>
          <span aria-hidden className="absolute bottom-0 start-0 h-0.5 bg-primary transition-[translate] duration-500 ease-[cubic-bezier(0.3,1.2,0.5,1)] motion-reduce:transition-none" style={{ width: `${round(100 / Math.max(1, types.length), 4)}%`, translate: `${Math.max(0, index) * 100}% 0` }} />
          {types.map((x, i) => (
            <label key={x.value} htmlFor={`${id}-t${i}`} className="group/t flex min-h-16 cursor-pointer flex-col items-center justify-center gap-1 px-2 py-3 text-center transition-colors has-[:focus-visible]:shadow-[inset_0_0_0_2px_color-mix(in_oklab,var(--primary)_45%,transparent)] sm:flex-row sm:gap-2.5">
              <input id={`${id}-t${i}`} type="radio" name={`${id}-type`} value={x.value} checked={type === x.value} onChange={() => pick(x.value)} className="sr-only" />
              {x.icon && <Icon name={x.icon} size={18} className={cn('transition-colors', type === x.value ? 'text-[color-mix(in_oklab,var(--primary)_85%,var(--foreground))]' : 'text-muted-foreground')} />}
              <span className={cn('text-[13px] font-medium leading-tight sm:text-[14px]', type === x.value ? 'text-foreground' : 'text-muted-foreground group-hover/t:text-foreground')}>{x.label}</span>
            </label>
          ))}
        </div>
        <div className="p-6 sm:p-8">
          <div ref={fieldsRef} key={type}>
            {current?.description && <p className="mb-6 text-pretty text-[14.5px] leading-relaxed text-muted-foreground">{current.description}</p>}
            <div className="grid grid-cols-1 gap-5 sm:grid-cols-2">
              {current?.fields.map((f) => (
                <FieldView key={`${type}-${f.name}`} f={f} id={`${id}-${type}-${f.name}`} value={values[f.name]} onChange={(v: FlowValue) => (setValues((x) => ({ ...x, [f.name]: v })), q.clear(f.name))} error={q.errors[f.name]} />
              ))}
            </div>
          </div>
          <div className="mt-6 grid grid-cols-1 gap-5 border-t border-border pt-6 sm:grid-cols-2">
            <Input label={t.name} required autoComplete="name" value={who.name} onChange={(e) => (setWho((w) => ({ ...w, name: e.target.value })), q.clear('__name'))} error={q.errors.__name} />
            <Input type="email" label={t.email} required autoComplete="email" value={who.email} onChange={(e) => (setWho((w) => ({ ...w, email: e.target.value })), q.clear('__email'))} error={q.errors.__email} />
          </div>
          <div className="mt-8 flex flex-col-reverse gap-3 sm:flex-row sm:items-center sm:justify-between">
            <p className="text-[13px] text-muted-foreground max-sm:text-center">{p.done?.text ?? t.doneText}</p>
            <Button type="submit" icon="send" className="max-sm:w-full">
              {p.submitLabel ?? t.send}
            </Button>
          </div>
        </div>
      </form>
    </Reveal>
  );
}

/* ------------------------------------------------------------------ */
/* call-or-form                                                        */
/* ------------------------------------------------------------------ */

function CallOrForm({ p, t }: { p: RequestQuoteProps; t: Texts }) {
  const id = useId();
  const q = useFormState();
  const [mode, setMode] = useState<'write' | 'call'>('write');
  const [v, setV] = useState({ question: '', name: '', email: '', phone: '' });
  const [windowPick, setWindowPick] = useState<string[]>([]);
  const [consent, setConsent] = useState(false);
  const formRef = useRef<HTMLFormElement>(null);
  useFocusFirstError(formRef, q.attempt);
  const set = (k: keyof typeof v) => (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => (setV((x) => ({ ...x, [k]: e.target.value })), q.clear(k));
  const windows = p.windows ?? [];
  if (q.done)
    return (
      <Done
        p={p}
        t={t}
        onAgain={() => (setV({ question: '', name: '', email: '', phone: '' }), setConsent(false), q.setDone(false))}
        title={mode === 'call' && windowPick[0] ? t.callDone.replace('{w}', windowPick[0]) : undefined}
        className="mx-auto max-w-[46rem]"
      />
    );
  return (
    <div className="mx-auto grid max-w-[64rem] grid-cols-1 gap-6 lg:grid-cols-[minmax(0,1fr)_19rem] lg:gap-8">
      <Reveal effect="rise" className="min-w-0">
        <form
          ref={formRef}
          noValidate
          className="kit-card p-6 sm:p-8"
          onSubmit={(e) => {
            e.preventDefault();
            const found: Record<string, string> = {};
            if (!v.name.trim()) found.name = t.nameNeeded;
            if (mode === 'write') {
              if (!v.question.trim()) found.question = t.detailsNeeded;
              if (!isEmail(v.email)) found.email = t.emailNeeded;
            } else {
              if (!isPhone(v.phone)) found.phone = t.phoneNeeded;
              if (!windowPick.length) found.window = t.windowNeeded;
            }
            if (!consent) found.consent = t.consentNeeded;
            if (q.fail(found)) return;
            p.onSubmit?.({ mode, ...v, window: windowPick[0] });
            q.setDone(true);
          }}
        >
          {/* Two ways in, a switch with a sliding tile */}
          <div role="radiogroup" aria-label={t.how} className="relative grid grid-cols-2 rounded-xl bg-[color-mix(in_oklab,var(--foreground)_6%,transparent)] p-1">
            <span aria-hidden className={cn('absolute inset-y-1 start-1 w-[calc(50%-0.25rem)] rounded-lg bg-card shadow-[var(--shadow-sm)] transition-[translate] duration-[420ms] ease-[cubic-bezier(0.3,1.25,0.5,1)] motion-reduce:transition-none', mode === 'call' && 'translate-x-full rtl:-translate-x-full')} />
            {(['write', 'call'] as const).map((m) => (
              <label key={m} htmlFor={`${id}-${m}`} className="relative z-10 flex min-h-11 cursor-pointer items-center justify-center gap-2 rounded-lg text-[14px] font-medium text-muted-foreground transition-colors has-[:checked]:text-foreground has-[:focus-visible]:shadow-[0_0_0_2px_color-mix(in_oklab,var(--primary)_45%,transparent)]">
                <input id={`${id}-${m}`} type="radio" name={`${id}-mode`} value={m} checked={mode === m} onChange={() => (setMode(m), q.fail({}))} className="sr-only" />
                <Icon name={m === 'write' ? 'mail' : 'phone-call'} size={16} />
                {m === 'write' ? t.write : t.call}
              </label>
            ))}
          </div>
          <div key={mode} className="kit-rise mt-6 grid grid-cols-1 gap-5 sm:grid-cols-2">
            {mode === 'write' ? (
              <>
                <Textarea label={t.question} required value={v.question} onChange={set('question')} error={q.errors.question} minRows={4} maxLength={1500} className="sm:col-span-2" />
                <Input label={t.name} required autoComplete="name" value={v.name} onChange={set('name')} error={q.errors.name} />
                <Input type="email" label={t.email} required autoComplete="email" value={v.email} onChange={set('email')} error={q.errors.email} />
              </>
            ) : (
              <>
                <Input label={t.name} required autoComplete="name" value={v.name} onChange={set('name')} error={q.errors.name} />
                <Input type="tel" inputMode="tel" label={t.phone} required autoComplete="tel" value={v.phone} onChange={set('phone')} error={q.errors.phone} />
                <ChipGroup legend={t.window} required options={windows.map((w) => ({ value: w, label: w }))} value={windowPick} onChange={(x) => (setWindowPick(x), q.clear('window'))} error={q.errors.window} layout={windows.length >= 4 ? 2 : 'wrap'} className="sm:col-span-2" />
              </>
            )}
            <div className="sm:col-span-2">
              <Checkbox label={t.consent} checked={consent} onChange={(e) => (setConsent(e.target.checked), q.clear('consent'))} error={q.errors.consent} />
            </div>
          </div>
          <div className="mt-7 border-t border-border pt-6">
            <Button type="submit" icon={mode === 'write' ? 'send' : 'phone-call'} className="max-sm:w-full">
              {mode === 'write' ? (p.submitLabel ?? t.send) : t.call}
            </Button>
          </div>
        </form>
      </Reveal>
      <Reveal effect="rise" delay={120}>
        <aside className="grid gap-6 rounded-2xl border border-border bg-surface p-6">
          {p.contact && <Person c={p.contact} t={t} />}
          {p.contact?.phone && (
            <a href={`tel:${p.contact.phone.replace(/[^\d+]/g, '')}`} className="flex min-h-11 items-center gap-2.5 text-[15px] font-semibold tabular-nums text-foreground underline-offset-4 hover:underline">
              <Icon name="phone" size={17} className="text-muted-foreground" />
              {p.contact.phone}
            </a>
          )}
          {p.steps && (
            <div className="border-t border-border pt-6">
              <NextSteps steps={p.steps} t={t} />
            </div>
          )}
        </aside>
      </Reveal>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* Section                                                             */
/* ------------------------------------------------------------------ */

/**
 * A request for a quote.
 *   <RequestQuote variant="brief" topics={['Website', 'Branding']} budget={{ min: 2000, max: 40000, step: 1000, currency: '€' }} steps={[…]} />
 *   <RequestQuote variant="line-items" units={['pcs', 'boxes']} />
 */
export function RequestQuote(props: RequestQuoteProps) {
  const { variant = 'brief', labels, className } = props;
  const t = useTexts(TEXTS, labels);
  return (
    <Section className={className}>
      {variant !== 'brief' && <FlowHead eyebrow={props.eyebrow} title={props.title} description={props.description} align="center" className="mb-10 sm:mb-14" />}
      {variant === 'brief' && <Brief p={props} t={t} />}
      {variant === 'line-items' && <LineItems p={props} t={t} />}
      {variant === 'by-type' && <ByType p={props} t={t} />}
      {variant === 'call-or-form' && <CallOrForm p={props} t={t} />}
    </Section>
  );
}