panel/src/app/auth/signin/page.js

"use client"

import { useState, Suspense } from "react"
import { signIn, getSession } from "next-auth/react"
import { useRouter } from "next/navigation"
import { useSearchParams } from "next/navigation"

function SignInContent() {
  const [username, setUsername] = useState("")
  const [password, setPassword] = useState("")
  const [error, setError] = useState("")
  const [isLoading, setIsLoading] = useState(false)
  const router = useRouter()
  const searchParams = useSearchParams()
  const callbackUrl = searchParams.get("callbackUrl") || "/"

  const handleSubmit = async (e) => {
    e.preventDefault()
    setIsLoading(true)
    setError("")

    try {
      const result = await signIn("credentials", {
        username,
        password,
        redirect: false,
      })

      if (result?.error) {
        setError("Invalid username or password")
      } else {
        // Successful login
        router.push(callbackUrl)
        router.refresh()
      }
    } catch (error) {
      setError("An error occurred. Please try again.")
    } finally {
      setIsLoading(false)
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-8">
        <div>
          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
            Zaloguj się do swojego konta
          </h2>
          <p className="mt-2 text-center text-sm text-gray-600">
            Dostęp do panelu
          </p>
        </div>
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          {error && (
            <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded relative">
              {error}
            </div>
          )}
          
          <div className="rounded-md shadow-sm -space-y-px">
            <div>
              <label htmlFor="username" className="sr-only">
                Nazwa użytkownika
              </label>
              <input
                id="username"
                name="username"
                type="text"
                autoComplete="username"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Nazwa użytkownika"
                value={username}
                onChange={(e) => setUsername(e.target.value)}
              />
            </div>
            <div>
              <label htmlFor="password" className="sr-only">
                Hasło
              </label>
              <input
                id="password"
                name="password"
                type="password"
                autoComplete="current-password"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-b-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
              />
            </div>
          </div>

          <div>
            <button
              type="submit"
              disabled={isLoading}
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {isLoading ? (
                <span className="flex items-center">
                  <svg className="animate-spin -ml-1 mr-3 h-5 w-5 text-white" 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"></circle>
                    <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                  </svg>
                  Zaloguj...
                </span>
              ) : (
                "Sign in"
              )}
            </button>
          </div>

          {/* <div className="text-center">
            <div className="text-sm text-gray-600 bg-blue-50 p-3 rounded">
              <p className="font-medium">Default Admin Account:</p>
              <p>Email: admin@localhost</p>
              <p>Password: admin123456</p>
            </div>
          </div> */}
        </form>
      </div>
    </div>
  )
}

export default function SignIn() {
  return (
    <Suspense fallback={
      <div className="min-h-screen flex items-center justify-center bg-gray-50">
        <div className="text-center">
          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500 mx-auto mb-4"></div>
          <p className="text-gray-600">Loading...</p>
        </div>
      </div>
    }>
      <SignInContent />
    </Suspense>
  )
}