'use client'

import { useState } from 'react'
import { useTranslations } from 'next-intl'
import { useRouter } from '@/i18n/navigation'

const ERROR_KEYS = [
  'missingFields',
  'passwordMismatch',
  'passwordTooLong',
  'invalidToken',
  'wrongCurrentPassword',
  'accountNotFound',
] as const

export function ChangePasswordForm() {
  const t = useTranslations('ChangePassword')
  const router = useRouter()
  const [form, setForm] = useState({ currentPassword: '', newPassword: '', confPassword: '', token: '' })
  const [busy, setBusy] = useState(false)
  const [done, setDone] = 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 || done) return
    setBusy(true)
    setMessage(null)
    try {
      const res = await fetch('/api/account/change-password', {
        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) {
        setDone(true)
        setMessage({ ok: true, text: t('success') })
        setTimeout(() => {
          router.push('/login')
          router.refresh()
        }, 2500)
      } 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 {
      if (!done) 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="password" maxLength={16} placeholder={t('newPassword')} value={form.newPassword} onChange={(e) => upd('newPassword', e.target.value)} /></td></tr>
              <tr><td><input type="password" maxLength={16} placeholder={t('confPassword')} value={form.confPassword} onChange={(e) => upd('confPassword', 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-password-button" disabled={busy || done}>
                  {busy ? t('changing') : 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>
    </>
  )
}