Sistem-Pakar-Diagnosa-Penyakit-Hama-Bayam/frontend/lib/user/login_page.dart

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
import 'home_page.dart';
import 'package:SIBAYAM/admin/admin_page.dart';
import 'register_page.dart';
import 'forgot_password_page.dart';

class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final TextEditingController _emailController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  bool _isLoading = false;
  bool _isPasswordVisible = false;

  // Method to show error dialog
  void _showErrorDialog(String message) {
    showDialog(
      context: context,
      builder:
          (context) => AlertDialog(
            title: Row(
              children: [
                Icon(Icons.error_outline, color: Colors.red),
                SizedBox(width: 10),
                Text('Error'),
              ],
            ),
            content: Text(message),
            actions: [
              TextButton(
                onPressed: () => Navigator.of(context).pop(),
                child: Text('OK', style: TextStyle(color: Color(0xFF9DC08D))),
              ),
            ],
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(15),
            ),
          ),
    );
  }

  Future<void> _login() async {
    setState(() {
      _isLoading = true;
    });

    String email = _emailController.text.trim();
    String password = _passwordController.text.trim();

    if (email.isEmpty || password.isEmpty) {
      setState(() {
        _isLoading = false;
      });
      _showErrorDialog('Email dan Password harus diisi');
      return;
    }

    try {
      var url = Uri.parse("https://backend-sistem-pakar-diagnosa-penya.vercel.app/api/auth/login");
      var response = await http.post(
        url,
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"email": email, "password": password}),
      );

      var responseData = jsonDecode(response.body);

      if (response.statusCode == 200) {
        // Simpan token & role ke SharedPreferences
        final SharedPreferences prefs = await SharedPreferences.getInstance();
        print("User ID dari respons login: ${responseData['userId']}");
        await prefs.setString('token', responseData['token']);
        await prefs.setString('role', responseData['role']);
        await prefs.setString('email', email);
        await prefs.setString('userId', responseData['userId'].toString());

        // Redirect berdasarkan role
        if (responseData['role'] == 'admin') {
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(builder: (context) => AdminPage()),
          );
        } else {
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(builder: (context) => HomePage()),
          );
        }
      } else {
        setState(() {
          _isLoading = false;
        });
        _showErrorDialog(
          responseData['message'] ?? 'Email atau Password salah',
        );
      }
    } catch (e) {
      setState(() {
        _isLoading = false;
      });
      _showErrorDialog('Terjadi kesalahan koneksi. Silakan coba lagi.');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color(0xFF9DC08D),
      body: Stack(
        children: [
          Positioned(
            top: 40,
            left: 20,
            child: IconButton(
              icon: Icon(Icons.arrow_back, color: Colors.white),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
          ),
          Center(
            child: SingleChildScrollView(
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 20.0),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Image.asset('assets/images/bayam.png', height: 150),
                    SizedBox(height: 30),
                    Card(
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(15),
                      ),
                      elevation: 5,
                      child: Padding(
                        padding: const EdgeInsets.all(20.0),
                        child: Column(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            TextField(
                              controller: _emailController,
                              decoration: InputDecoration(
                                labelText: 'email',
                                labelStyle: TextStyle(
                                  color: Colors.black.withOpacity(0.7),
                                ),
                                border: OutlineInputBorder(
                                  borderRadius: BorderRadius.circular(10),
                                ),
                                focusedBorder: OutlineInputBorder(
                                  borderRadius: BorderRadius.circular(10),
                                  borderSide: BorderSide(
                                    color: Colors.black.withOpacity(0.6),
                                    width: 2,
                                  ),
                                ),
                              ),
                            ),
                            SizedBox(height: 20),
                            TextField(
                              controller: _passwordController,
                              obscureText:
                                  !_isPasswordVisible, // Toggle visibility based on state
                              decoration: InputDecoration(
                                labelText: 'Password',
                                labelStyle: TextStyle(
                                  color: Colors.black.withOpacity(0.7),
                                ),
                                border: OutlineInputBorder(
                                  borderRadius: BorderRadius.circular(10),
                                ),
                                focusedBorder: OutlineInputBorder(
                                  borderRadius: BorderRadius.circular(10),
                                  borderSide: BorderSide(
                                    color: Colors.black.withOpacity(0.6),
                                    width: 2,
                                  ),
                                ),
                                suffixIcon: IconButton(
                                  icon: Icon(
                                    _isPasswordVisible
                                        ? Icons.visibility
                                        : Icons.visibility_off,
                                    color: Color(0xFF9DC08D),
                                  ),
                                  onPressed: () {
                                    setState(() {
                                      _isPasswordVisible = !_isPasswordVisible;
                                    });
                                  },
                                ),
                              ),
                            ),
                            SizedBox(height: 20),
                            SizedBox(
                              width: double.infinity,
                              height: 50,
                              child: ElevatedButton(
                                style: ElevatedButton.styleFrom(
                                  backgroundColor: Colors.green,
                                  shape: RoundedRectangleBorder(
                                    borderRadius: BorderRadius.circular(10),
                                  ),
                                ),
                                onPressed: _isLoading ? null : _login,
                                child:
                                    _isLoading
                                        ? CircularProgressIndicator(
                                          color: Colors.white,
                                        )
                                        : Text(
                                          'Login',
                                          style: TextStyle(
                                            color: Colors.white,
                                            fontSize: 16,
                                            fontWeight: FontWeight.bold,
                                          ),
                                        ),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                    SizedBox(height: 20),
                    Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        TextButton(
                          onPressed: () {
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                builder: (context) => RegisterPage(),
                              ),
                            );
                          },
                          style: TextButton.styleFrom(
                            backgroundColor: Colors.white,
                            padding: EdgeInsets.symmetric(
                              horizontal: 16,
                              vertical: 12,
                            ),
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(10),
                            ),
                          ),
                          child: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Icon(
                                Icons.person_add_outlined,
                                color: Color(0xFF9DC08D),
                                size: 16,
                              ),
                              SizedBox(width: 8),
                              Text(
                                'Belum punya akun? Daftar',
                                style: TextStyle(
                                  color: Color(0xFF9DC08D),
                                  fontWeight: FontWeight.w500,
                                  fontSize: 13,
                                ),
                              ),
                            ],
                          ),
                        ),
                        SizedBox(height: 10),
                        TextButton(
                          onPressed: () {
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                builder: (context) => ForgotPasswordPage(),
                              ),
                            );
                          },
                          style: TextButton.styleFrom(
                            backgroundColor: Colors.white,
                            padding: EdgeInsets.symmetric(
                              horizontal: 16,
                              vertical: 12,
                            ),
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(10),
                            ),
                          ),
                          child: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Icon(
                                Icons.lock_reset_outlined,
                                color: Color(0xFF9DC08D),
                                size: 16,
                              ),
                              SizedBox(width: 8),
                              Text(
                                'Lupa Password?',
                                style: TextStyle(
                                  color: Color(0xFF9DC08D),
                                  fontWeight: FontWeight.w500,
                                  fontSize: 13,
                                ),
                              ),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}