'use client'

import { useState } from 'react'
import { useTranslations } from 'next-intl'

const ERROR_KEYS = ['missingFields', 'wrongCurrentEmail', 'invalidEmail', 'invalidToken', 'wrongCurrentPassword'] as const

export function ChangeEmailForm() {
  const t = useTranslations('ChangeEmail')
  const [form, setForm] = useState({ currentPassword: '', currentEmail: '', newEmail: '', confEmail: '', token: '' })
  const [busy, setBusy] = useState(false)
  const [message, setMessage] = useState<{ ok: boolean; text: string } | null>(null)

  function upd(k: string, v: string) {
    setForm((f) => ({ ...f, [k]: v }))
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    if (busy) return
    setBusy(true)
    setMessage(null)
    try {
      const res = await fetch('/api/account/change-email', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'same-origin',
        body: JSON.stringify(form),
      })
      const data: { success?: boolean; error?: string } = await res.json()
      if (data.success) setMessage({ ok: true, text: t('success') })
      else {
        const key = (ERROR_KEYS as readonly string[]).includes(data.error ?? '') ? data.error! : 'genericError'
        setMessage({ ok: false, text: t(key) })
      }
    } catch {
      setMessage({ ok: false, text: t('genericError') })
    } finally {
      setBusy(false)
    }
  }

  return (
    <>
      <p>{t('info')}</p>
      <br />
      <div className="centered">
        <form onSubmit={handleSubmit} acceptCharset="utf-8">
          <table className="middle-center-table">
            <tbody>
              <tr><td><input type="password" maxLength={16} placeholder={t('currentPassword')} value={form.currentPassword} onChange={(e) => upd('currentPassword', e.target.value)} /></td></tr>
              <tr><td><input type="email" maxLength={320} placeholder={t('currentEmail')} value={form.currentEmail} onChange={(e) => upd('currentEmail', e.target.value)} /></td></tr>
              <tr><td><input type="email" maxLength={320} placeholder={t('newEmail')} value={form.newEmail} onChange={(e) => upd('newEmail', e.target.value)} /></td></tr>
              <tr><td><input type="email" maxLength={320} placeholder={t('confEmail')} value={form.confEmail} onChange={(e) => upd('confEmail', e.target.value)} /></td></tr>
              <tr><td><input type="text" maxLength={6} placeholder={t('token')} value={form.token} onChange={(e) => upd('token', e.target.value)} /></td></tr>
              <tr><td>
                <button type="submit" className="change-email-button" disabled={busy}>
                  {busy ? t('sending') : t('submit')}
                </button>
              </td></tr>
            </tbody>
          </table>
        </form>
        <hr />
        <div className="alert-message" style={{ display: message ? 'block' : 'none' }}>
          {message && <span className={message.ok ? 'ok-form-response' : 'red-form-response'}>{message.text}</span>}
        </div>
      </div>
    </>
  )
}
