'use client';

import { useCallback, useState } from 'react';
import { X } from 'lucide-react';
import { useLoginForm } from '../lib/useLoginForm';
import { useLoginModal, useRegisterModal } from '@/shared/zustand/auth';
import { useTranslations } from 'next-intl';
import { formatPhone, normalizeDigits } from '@/shared/lib/formatPhone';
import { MotionWrapper } from '@/shared/ui';
import PhonePrefix from '@/shared/ui/phonePrefix';

export function LoginForm() {
  const [isFocused, setIsFocused] = useState(false);
  const t = useTranslations('Auth.Login');
  const tCommon = useTranslations('Common');

  const { phone, setPhone, submit, error, loading } = useLoginForm();
  const toggleLoginModal = useLoginModal((state) => state.toggleLoginModal);
  const toggleRegisterModal = useRegisterModal(
    (state) => state.toggleRegisterModal,
  );

  const handlePhoneChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      setPhone(normalizeDigits(e.target.value));
    },
    [setPhone],
  );

  return (
    <>
      {/* Backdrop */}
      <div
        className="fixed inset-0 z-20 bg-black/40 backdrop-blur-sm"
        onClick={toggleLoginModal}
      />

      {/* Modal */}
      <div className="fixed inset-0 z-30 flex items-center justify-center pointer-events-none px-6">
        <MotionWrapper>
          <div className="pointer-events-auto w-full max-w-sm rounded border border-stone-200 bg-white px-8 pb-8 pt-10 shadow-sm">
            {/* Close */}
            <div className="flex justify-end -mt-2 mb-4">
              <button
                onClick={toggleLoginModal}
                className="flex h-7 w-7 items-center justify-center rounded-sm text-stone-400 transition-colors hover:bg-stone-100 hover:text-stone-700"
              >
                <X className="h-4 w-4" />
              </button>
            </div>

            {/* Header */}
            <p className="mb-1 text-[0.65rem] font-semibold uppercase tracking-[0.16em] text-stone-400">
              {t('welcome')}
            </p>
            <h1 className="mb-1 font-serif text-3xl leading-tight text-stone-900">
              {t('title')}
            </h1>
            <p className="mb-8 text-sm text-stone-400">{t('description')}</p>

            <form onSubmit={submit} noValidate className="flex flex-col gap-5">
              {/* Phone field */}
              <div className="flex flex-col gap-1.5">
                <label
                  htmlFor="phone"
                  className="text-[0.7rem] font-medium tracking-widest uppercase text-stone-500"
                >
                  {t('phoneLabel')}
                </label>

                <div
                  className={`relative transition-transform duration-200 ${isFocused ? 'scale-[1.01]' : ''}`}
                >
                  <PhonePrefix isFocused={isFocused} />
                  <input
                    id="phone"
                    type="tel"
                    placeholder={t('phonePlaceholder')}
                    value={formatPhone(phone)}
                    onChange={handlePhoneChange}
                    onFocus={() => setIsFocused(true)}
                    onBlur={() => setIsFocused(false)}
                    className={`
                      w-full rounded-sm border bg-stone-50 py-2.5 pl-30 pr-3.5
                      text-[0.95rem] font-medium text-stone-900 outline-none
                      placeholder:text-stone-300 transition-all duration-150
                      ${
                        error
                          ? 'border-red-400 ring-2 ring-red-200/40'
                          : isFocused
                            ? 'border-stone-400 ring-2 ring-stone-300/30'
                            : 'border-stone-200 hover:border-stone-300'
                      }
                    `}
                  />
                </div>

                {/* Digit counter / complete hint */}
                <div className="flex items-center justify-between px-0.5">
                  <span className="text-[0.7rem] text-stone-400">
                    {phone.length > 0 &&
                      t('digitsEntered', { count: phone.length })}
                  </span>
                  {phone.length === 9 && (
                    <span className="text-[0.7rem] font-medium text-emerald-600">
                      {tCommon('complete')}
                    </span>
                  )}
                </div>
              </div>

              {/* Error */}
              {error && (
                <div className="rounded-sm border border-red-200 bg-red-50 px-3.5 py-2.5 text-[0.8rem] text-red-500">
                  {error}
                </div>
              )}

              {/* Submit */}
              <button
                type="submit"
                disabled={loading || phone.length !== 9}
                className="
                  mt-1 w-full rounded-sm bg-stone-900 py-3
                  text-[0.82rem] font-semibold uppercase tracking-widest text-stone-100
                  transition-all duration-150
                  hover:bg-stone-800 active:scale-[0.99]
                  disabled:cursor-not-allowed disabled:opacity-40
                "
              >
                {loading ? (
                  <span className="flex items-center justify-center gap-2">
                    <span className="h-3.5 w-3.5 rounded-full border-2 border-stone-500 border-t-stone-100 animate-spin" />
                    {t('sending')}
                  </span>
                ) : (
                  t('sendCode')
                )}
              </button>

              {/* Divider */}
              <div className="relative flex items-center gap-3 py-1">
                <span className="h-px flex-1 bg-stone-200" />
                <span className="text-[0.65rem] font-medium uppercase tracking-widest text-stone-400">
                  {tCommon('or')}
                </span>
                <span className="h-px flex-1 bg-stone-200" />
              </div>

              {/* Register hint */}
              <p className="text-center text-[0.78rem] text-stone-400 flex items-center justify-center gap-2">
                {t('registerPrompt')}
                <p
                  onClick={() => {
                    toggleLoginModal();
                    toggleRegisterModal();
                  }}
                  className="text-stone-800 hover:cursor-pointer underline underline-offset-2 hover:text-stone-600 transition-colors"
                >
                  {t('registerLink')}
                </p>
              </p>
            </form>
          </div>
        </MotionWrapper>
      </div>
    </>
  );
}