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import { useEffect, useState } from 'react'
import { useI18n } from '../i18n'
import { Callout, Spinner } from './ui'
import { ApiRequestError } from '../api/client'
import {
  deleteProfile, profileStatus, setConsent,
  type ConsentPurpose, type DeleteProfileResult, type ProfileStatus,
} from '../api/ai'

/** Customer privacy/consent controls (PR C4). Advisory only — these choices never approve, deny or
 * change a payment. Required security processing is shown as informational (not a consent toggle).
 * Identity is the authenticated principal (session token); no user id is sent. */
export function ConsentControls() {
  const { t } = useI18n()
  const [status, setStatus] = useState<ProfileStatus | null>(null)
  const [loading, setLoading] = useState(true)
  const [err, setErr] = useState(false)
  const [busy, setBusy] = useState<ConsentPurpose | 'delete' | null>(null)
  const [notice, setNotice] = useState<{ tone: 'ok' | 'warn'; msg: string } | null>(null)
  const [deleted, setDeleted] = useState<DeleteProfileResult | null>(null)

  async function refresh(signal?: AbortSignal) {
    setLoading(true)
    try {
      setStatus(await profileStatus(signal))
    } catch {
      setErr(true)
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    const c = new AbortController()
    refresh(c.signal)
    return () => c.abort()
  }, [])

  async function toggle(purpose: ConsentPurpose, grant: boolean) {
    if (!status) return
    setBusy(purpose); setNotice(null)
    try {
      const next = await setConsent(purpose, grant, status.record_version)
      setStatus(next); setNotice({ tone: 'ok', msg: t('consent.saved') })
    } catch (e) {
      if (e instanceof ApiRequestError && e.status === 409) {
        await refresh(); setNotice({ tone: 'warn', msg: t('consent.conflict') })
      } else {
        setErr(true)
      }
    } finally {
      setBusy(null)
    }
  }

  async function onDelete() {
    if (!window.confirm(t('consent.delete.confirm'))) return
    setBusy('delete'); setNotice(null)
    try {
      const res = await deleteProfile()
      setDeleted(res)
      await refresh()
      setNotice({ tone: 'ok', msg: t('consent.delete.done') })
    } catch {
      setErr(true)
    } finally {
      setBusy(null)
    }
  }

  if (loading && !status) return <Spinner label={t('common.loading')} />
  if (err && !status) return <Callout tone="warn">{t('home.security.unavailable')}</Callout>
  if (!status) return null

  const optionalRow = (purpose: ConsentPurpose, titleKey: string, explainKey: string) => {
    const meta = status.purposes[purpose]
    const granted = meta.status === 'granted'
    return (
      <div className="consent-row" data-testid={`consent-${purpose}`}>
        <div className="consent-row-text">
          <strong>{t(titleKey as never)}</strong>
          <p className="muted small">{t(explainKey as never)}</p>
        </div>
        <div className="consent-row-control">
          <span className={`badge ${granted ? 'tone-ok' : 'tone-info'}`} data-testid={`consent-state-${purpose}`}>
            {granted ? t('consent.on') : t('consent.off')}
          </span>
          <button className="btn" disabled={busy === purpose}
            onClick={() => toggle(purpose, !granted)}
            data-testid={`consent-toggle-${purpose}`}>
            {granted ? t('consent.withdraw') : t('consent.grant')}
          </button>
        </div>
      </div>
    )
  }

  return (
    <div className="consent-controls">
      {/* Required security processing — informational, NOT a consent toggle, not "granted". */}
      <div className="consent-row" data-testid="consent-service_essential">
        <div className="consent-row-text">
          <strong>{t('required.title')} <span className="badge tone-warn">{t('required.badge')}</span></strong>
          <p className="muted small">{t('required.explain')}</p>
        </div>
        <span className="badge tone-neutral" data-testid="required-state">{t('required.state')}</span>
      </div>

      {optionalRow('optional_personalization', 'consent.personalization.title', 'consent.personalization.explain')}
      {optionalRow('optional_federation', 'consent.federation.title', 'consent.federation.explain')}

      {status.personalization_without_shared_learning && (
        <Callout tone="info"><span data-testid="pwsl">{t('consent.pwsl')}</span></Callout>
      )}
      {notice && <Callout tone={notice.tone}>{notice.msg}</Callout>}

      <div className="consent-delete">
        <strong>{t('consent.delete.title')}</strong>
        <p className="muted small">{t('consent.delete.explain')}</p>
        <button className="btn danger" disabled={busy === 'delete'}
          onClick={onDelete} data-testid="consent-delete">
          {t('consent.delete.button')}
        </button>
        {deleted && (
          <div className="deletion-receipt" data-testid="deletion-receipt">
            <p className="small"><strong>{t('consent.delete.deletedLabel')}:</strong> {deleted.deleted_categories.join(', ')}</p>
            <p className="small"><strong>{t('consent.delete.retainedLabel')}:</strong> {deleted.retained_categories.join(', ')}</p>
            <p className="muted small">{t('consent.delete.notUnlearning')}</p>
          </div>
        )}
      </div>
    </div>
  )
}