/**
 * FEAT-13: Einstellungen — Zuchtprofil (Verkäufer-Block der Abgabeverträge).
 * Einzelzeilen-Settings im Backend (/settings/breeder-profile); die Züchterin
 * pflegt ihre Daten hier statt in einer JSON-Datei.
 */
import { useState, type FormEvent } from 'react'
import { de } from '../strings/de'
import {
  EMPTY_BREEDER_PROFILE,
  getBreederProfile,
  isBreederProfileComplete,
  putBreederProfile,
  type BreederProfile,
} from '../api/settings'
import { useApi, useMutation } from '../hooks/useApi'
import { useToast } from '../components/toast'
// EXPORT-1 (Oscar): Datenexport-Karte
import DatenexportCard from '../components/DatenexportCard'

export default function EinstellungenPage() {
  const t = de.pages.einstellungen
  const tz = t.zuchtprofil
  const toast = useToast()

  const [form, setForm] = useState<BreederProfile>(EMPTY_BREEDER_PROFILE)
  const [initialized, setInitialized] = useState(false)
  const [saved, setSaved] = useState(false)

  const existing = useApi(() => getBreederProfile(), [])
  if (existing.data && !initialized) {
    setInitialized(true)
    setForm(existing.data)
  }

  const set = <K extends keyof BreederProfile>(key: K, value: string) => {
    setSaved(false)
    setForm((f) => ({ ...f, [key]: value }))
  }

  const mutation = useMutation((profile: BreederProfile) => putBreederProfile(profile))

  async function onSubmit(e: FormEvent) {
    e.preventDefault()
    const result = await mutation.run(form)
    if (result.ok) {
      setSaved(true)
      toast.success(de.common.saved)
    } else {
      toast.error(result.error)
    }
  }

  if (existing.loading) return <p className="muted">{de.common.loading}</p>
  if (existing.error) {
    return (
      <section className="page">
        <h2>{t.title}</h2>
        <div className="alert alert--error">
          <span>{existing.error}</span>
          <button type="button" className="btn" onClick={existing.reload}>
            {de.common.retry}
          </button>
        </div>
      </section>
    )
  }

  const field = (
    key: keyof BreederProfile,
    label: string,
    hint?: string,
    type: string = 'text',
  ) => (
    <label className="field">
      <span>{label}</span>
      <input className="input" type={type} value={form[key]} onChange={(e) => set(key, e.target.value)} />
      {hint && <small className="muted">{hint}</small>}
    </label>
  )

  return (
    <section className="page">
      <h2>{t.title}</h2>

      <h3>{tz.title}</h3>
      <p className="muted">{tz.intro}</p>
      {!isBreederProfileComplete(form) && <div className="alert alert--error">{tz.incompleteHint}</div>}

      <form className="form" onSubmit={onSubmit} noValidate>
        {field('zuchtName', tz.fields.zuchtName)}
        {field('nameSuffix', tz.fields.nameSuffix, tz.fields.nameSuffixHint)}
        {field('name', tz.fields.name, tz.fields.nameHint)}
        {field('address', tz.fields.address, tz.fields.addressHint)}
        {field('city', tz.fields.city)}
        {field('phone', tz.fields.phone, undefined, 'tel')}
        {field('email', tz.fields.email, undefined, 'email')}
        {field('homepage', tz.fields.homepage, undefined, 'url')}

        {mutation.error && <div className="alert alert--error">{mutation.error}</div>}

        <div className="form-actions">
          <button type="submit" className="btn btn--primary" disabled={mutation.pending}>
            {mutation.pending ? tz.saving : tz.save}
          </button>
          {saved && <span className="muted">{tz.saved}</span>}
        </div>
      </form>

      <DatenexportCard />
    </section>
  )
}