'use client';

import { useState, useTransition, useEffect } from 'react';
import { useTranslations } from 'next-intl';
import { fetchCurrentUser, changePasswordAction } from '@/lib/auth-actions';

export default function ChangePasswordPage() {
  const t = useTranslations('auth');
  const [isPending, startTransition] = useTransition();
  const [error, setError] = useState<string | null>(null);
  const [passwordMismatch, setPasswordMismatch] = useState(false);
  const [isForced, setIsForced] = useState(false);

  useEffect(() => {
    async function checkForceChange() {
      const currentUser = await fetchCurrentUser();
      if (currentUser?.mustChangePassword) {
        setIsForced(true);
      }
    }
    checkForceChange();
  }, []);

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setError(null);
    setPasswordMismatch(false);

    const formData = new FormData(e.currentTarget);
    const currentPassword = formData.get('currentPassword') as string;
    const newPassword = formData.get('newPassword') as string;
    const confirmPassword = formData.get('confirmPassword') as string;

    if (newPassword !== confirmPassword) {
      setPasswordMismatch(true);
      return;
    }

    startTransition(async () => {
      const result = await changePasswordAction(currentPassword, newPassword);

      if (result) {
        setError(result.error);
      }
    });
  }

  return (
    <div className="mx-auto max-w-md py-8 px-4">
      <h1 className="text-2xl font-semibold text-foreground mb-6">
        {t('changePassword.title')}
      </h1>

      {isForced && (
        <div className="rounded-md bg-yellow-50 dark:bg-yellow-900/20 border border-yellow-200 dark:border-yellow-800 px-4 py-3 text-sm text-yellow-800 dark:text-yellow-200 mb-6">
          {t('changePassword.forceChangeNotice')}
        </div>
      )}

      {error && (
        <div className="rounded-md bg-destructive/10 border border-destructive/20 px-4 py-3 text-sm text-destructive mb-6">
          {t(`changePassword.${error}`)}
        </div>
      )}

      {passwordMismatch && (
        <div className="rounded-md bg-destructive/10 border border-destructive/20 px-4 py-3 text-sm text-destructive mb-6">
          {t('changePassword.passwordMismatch')}
        </div>
      )}

      <form onSubmit={handleSubmit} className="space-y-5">
        <div className="space-y-2">
          <label
            htmlFor="currentPassword"
            className="text-sm font-medium text-foreground"
          >
            {t('changePassword.currentPassword')}
          </label>
          <input
            id="currentPassword"
            name="currentPassword"
            type="password"
            required
            autoComplete="current-password"
            className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
            placeholder={t('changePassword.currentPassword')}
          />
        </div>

        <div className="space-y-2">
          <label
            htmlFor="newPassword"
            className="text-sm font-medium text-foreground"
          >
            {t('changePassword.newPassword')}
          </label>
          <input
            id="newPassword"
            name="newPassword"
            type="password"
            required
            minLength={8}
            autoComplete="new-password"
            className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
            placeholder={t('changePassword.newPassword')}
          />
        </div>

        <div className="space-y-2">
          <label
            htmlFor="confirmPassword"
            className="text-sm font-medium text-foreground"
          >
            {t('changePassword.confirmPassword')}
          </label>
          <input
            id="confirmPassword"
            name="confirmPassword"
            type="password"
            required
            minLength={8}
            autoComplete="new-password"
            className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
            placeholder={t('changePassword.confirmPassword')}
          />
        </div>

        <button
          type="submit"
          disabled={isPending}
          className="btn btn-primary w-full"
        >
          {isPending ? (
            <svg
              className="animate-spin h-4 w-4"
              aria-hidden="true"
              xmlns="http://www.w3.org/2000/svg"
              fill="none"
              viewBox="0 0 24 24"
            >
              <circle
                className="opacity-25"
                cx="12"
                cy="12"
                r="10"
                stroke="currentColor"
                strokeWidth="4"
              />
              <path
                className="opacity-75"
                fill="currentColor"
                d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"
              />
            </svg>
          ) : (
            t('changePassword.submit')
          )}
        </button>
      </form>
    </div>
  );
}