import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:firebase_core/firebase_core.dart';

class RegisterPage extends StatefulWidget {
  const RegisterPage({super.key});

  @override
  State<RegisterPage> createState() => _RegisterPageState();
}

class _RegisterPageState extends State<RegisterPage> {
  final usernameController = TextEditingController();
  final emailController = TextEditingController();
  final passwordController = TextEditingController();

  bool isLoading = false;

  Future<void> registerUser() async {
    // Validasi input sederhana agar tidak mengirim data kosong
    if (usernameController.text.isEmpty ||
        emailController.text.isEmpty ||
        passwordController.text.isEmpty) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text("Semua kolom harus diisi")));
      return;
    }

    setState(() => isLoading = true);

    try {
      // 1. Buat user di Firebase Auth
      UserCredential userCredential = await FirebaseAuth.instance
          .createUserWithEmailAndPassword(
            email: emailController.text.trim(),
            password: passwordController.text.trim(),
          );

      String uid = userCredential.user!.uid;

      // 2. Simpan profil ke Realtime Database
      // Gunakan key 'nama' agar terbaca oleh AkunPage
      await FirebaseDatabase.instanceFor(
        app: Firebase.app(),
        databaseURL:
            "https://tugas-akhir-9947b-default-rtdb.asia-southeast1.firebasedatabase.app",
      ).ref("users/$uid").set({
        "nama": usernameController.text.trim(), // Key ini harus 'nama'
        "email": emailController.text.trim(),
        "uid": uid, // Opsional: simpan UID juga untuk referensi
      });

      // 3. Logout dan kembali ke halaman sebelumnya (Login)
      await FirebaseAuth.instance.signOut();

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text("Registrasi berhasil, silakan login")),
        );
        Navigator.pop(context); // Kembali ke halaman Login
      }
    } on FirebaseAuthException catch (e) {
      String message = "Registrasi gagal";
      if (e.code == 'weak-password') message = "Password terlalu lemah";
      if (e.code == 'email-already-in-use') message = "Email sudah terdaftar";

      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text(message)));
    } catch (e) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text("Terjadi kesalahan: $e")));
    } finally {
      if (mounted) {
        setState(() => isLoading = false);
      }
    }
  }

  Widget buildTextField({
    required String hint,
    required IconData icon,
    required TextEditingController controller,
    bool obscure = false,
  }) {
    return Container(
      margin: const EdgeInsets.only(bottom: 15),
      decoration: BoxDecoration(
        color: const Color(0xFFDCE9E1),
        borderRadius: BorderRadius.circular(10),
      ),
      child: TextField(
        controller: controller,
        obscureText: obscure,
        decoration: InputDecoration(
          prefixIcon: Icon(icon, color: Colors.grey),
          hintText: hint,
          border: InputBorder.none,
          contentPadding: const EdgeInsets.symmetric(vertical: 18),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFE6F0EA),
      body: Padding(
        padding: const EdgeInsets.all(20),
        child: Center(
          child: SingleChildScrollView(
            child: Column(
              children: [
                Image.asset(
                  "assets/images/logo1.png",
                  height: 240, // ✅ 2x lebih besar
                  fit: BoxFit.contain,
                ),

                const SizedBox(height: 40),

                buildTextField(
                  hint: "Username",
                  icon: Icons.person,
                  controller: usernameController,
                ),

                buildTextField(
                  hint: "Email",
                  icon: Icons.email,
                  controller: emailController,
                ),

                buildTextField(
                  hint: "Password",
                  icon: Icons.lock,
                  controller: passwordController,
                  obscure: true,
                ),

                const SizedBox(height: 10),

                SizedBox(
                  width: double.infinity,
                  height: 50,
                  child: ElevatedButton(
                    onPressed: isLoading ? null : registerUser,
                    style: ElevatedButton.styleFrom(
                      backgroundColor: const Color(0xFF67B985),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(8),
                      ),
                    ),
                    child: isLoading
                        ? const CircularProgressIndicator(color: Colors.white)
                        : const Text("Register"),
                  ),
                ),

                const SizedBox(height: 15),

                Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    const Text("sudah punya akun? "),
                    GestureDetector(
                      onTap: () => Navigator.pop(context),
                      child: const Text(
                        "Login",
                        style: TextStyle(
                          fontWeight: FontWeight.bold,
                          color: Colors.black,
                        ),
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}