'use client'

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

const ERROR_KEYS = ['invalidCredentials', 'missingFields', 'invalidRequest'] as const

export function LoginForm() {
  const t = useTranslations('Login')
  const router = useRouter()
  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [showPw, setShowPw] = useState(false)
  const [busy, setBusy] = useState(false)
  const [message, setMessage] = useState<{ ok: boolean; text: string } | null>(null)

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

  return (
    <div className="mx-auto max-w-sm text-center">
      <form onSubmit={handleSubmit} className="space-y-3">
        <input
          type="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          placeholder={t('email')}
          autoFocus
          required
          className="w-full rounded border border-amber-900/60 bg-[#2c1e14] px-3 py-2"
        />
        <div className="relative">
          <input
            type={showPw ? 'text' : 'password'}
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            placeholder={t('password')}
            maxLength={16}
            required
            className="w-full rounded border border-amber-900/60 bg-[#2c1e14] px-3 py-2 pr-10"
          />
          <button
            type="button"
            onClick={() => setShowPw((v) => !v)}
            className="absolute inset-y-0 right-2 text-amber-200/60"
            aria-label="toggle"
          >
            {showPw ? '🙈' : '👁'}
          </button>
        </div>
        <button
          type="submit"
          disabled={busy}
          className="w-full rounded bg-amber-600 px-4 py-2 font-semibold text-[#1b120b] disabled:opacity-60"
        >
          {busy ? t('connecting') : t('submit')}
        </button>
      </form>

      {message && (
        <p className={`mt-3 ${message.ok ? 'text-green-400' : 'text-red-400'}`}>{message.text}</p>
      )}
    </div>
  )
}
