import 'dart:convert';
import 'dart:io'; // Tambahkan ini
import 'package:flutter/material.dart';
import 'package:flutter/services.dart'; // Tambahkan ini untuk SystemNavigator.pop
import 'package:http/http.dart' as http;
import 'package:google_fonts/google_fonts.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../layout/main_layout.dart';
import '../pages/petugas_drawer.dart';
import '../pages/login_page.dart';

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

  @override
  State<DashboardAdminPage> createState() => _DashboardAdminPageState();
}

class _DashboardAdminPageState extends State<DashboardAdminPage> {
  bool _isAuthorized = false;
  bool _isLoading = true;
  String userName = "Loading...";

  int jumlahKader = 0;
  int jumlahBidan = 0;
  int jumlahDesa = 0;
  int jumlahDusun = 0;

  final String dashboardUrl =
      "http://ta.myhost.id/E31230549/mposyandu_api/dashboard_admin.php";

  @override
  void initState() {
    super.initState();
    _initPage();
  }

  Future<void> _initPage() async {
    final prefs = await SharedPreferences.getInstance();
    final isLogin = prefs.getBool("isLogin") ?? false;

    if (!isLogin) {
      if (!mounted) return;
      Navigator.pushAndRemoveUntil(
        context,
        MaterialPageRoute(builder: (_) => const LoginPage(fromGuard: true)),
        (route) => false,
      );
      return;
    }

    setState(() {
      _isAuthorized = true;
      String? savedName = prefs.getString('nama');
      userName = (savedName == null || savedName.isEmpty) ? "Admin" : savedName;
    });

    await fetchDashboard();
  }

  Future<void> fetchDashboard() async {
    if (!_isAuthorized) return;
    try {
      final response = await http.get(Uri.parse(dashboardUrl));
      if (response.statusCode == 200) {
        final data = json.decode(response.body);
        if (data["success"] == true) {
          if (mounted) {
            setState(() {
              jumlahKader = data["jumlah_kader"] ?? 0;
              jumlahBidan = data["jumlah_bidan"] ?? 0;
              jumlahDesa = data["jumlah_desa"] ?? 0;
              jumlahDusun = data["jumlah_dusun"] ?? 0;
              _isLoading = false;
            });
          }
        }
      }
    } catch (e) {
      debugPrint("ERROR DASHBOARD: $e");
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    // Logika Responsif
    double screenWidth = MediaQuery.of(context).size.width;

    // Jika lebar layar > 700px (Desktop/Tablet), gunakan 4 kolom. Jika tidak (HP), 2 kolom.
    int crossAxisCount = screenWidth > 700 ? 4 : 2;

    // Mengatur rasio tinggi kartu agar tetap proporsional
    double aspectRatio = screenWidth > 700 ? 1.5 : 1.1;

    // Membungkus dengan PopScope agar ketika klik back button aplikasi keluar
    return PopScope(
      canPop: false, // Menahan aksi "back" standar navigator
      onPopInvokedWithResult: (didPop, result) {
        if (didPop) return;
        // Keluar dari aplikasi secara total
        if (Platform.isAndroid) {
          SystemNavigator.pop();
        } else if (Platform.isIOS) {
          exit(0);
        }
      },
      child: MainLayout(
        title: " ",
        drawer: const DrawerPetugas(),
        body: RefreshIndicator(
          onRefresh: fetchDashboard,
          child: _isLoading
              ? const Center(child: CircularProgressIndicator())
              : SingleChildScrollView(
                  physics: const AlwaysScrollableScrollPhysics(),
                  padding:
                      const EdgeInsets.symmetric(horizontal: 20, vertical: 25),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      // HEADER AREA
                      RichText(
                        text: TextSpan(
                          children: [
                            TextSpan(
                              text: 'Selamat Datang Admin\n',
                              style: GoogleFonts.poppins(
                                  fontSize: 16,
                                  fontWeight: FontWeight.w500,
                                  color: Colors.black54),
                            ),
                            TextSpan(
                              text: userName,
                              style: GoogleFonts.poppins(
                                  fontSize: 22,
                                  fontWeight: FontWeight.w700,
                                  color: const Color(0xFF1385E2)),
                            ),
                          ],
                        ),
                      ),
                      const SizedBox(height: 25),

                      // GRID AREA (Dinamis berdasarkan perangkat)
                      GridView.count(
                        shrinkWrap: true,
                        physics: const NeverScrollableScrollPhysics(),
                        crossAxisCount: crossAxisCount,
                        crossAxisSpacing: 15,
                        mainAxisSpacing: 15,
                        childAspectRatio: aspectRatio,
                        children: [
                          _card(
                              "Kader", jumlahKader, Icons.groups, Colors.blue),
                          _card("Bidan", jumlahBidan, Icons.medical_services,
                              Colors.green),
                          _card("Desa", jumlahDesa, Icons.location_city,
                              Colors.orange),
                          _card("Dusun", jumlahDusun, Icons.map, Colors.purple),
                        ],
                      ),
                    ],
                  ),
                ),
        ),
      ),
    );
  }

  Widget _card(String title, int val, IconData icon, Color color) {
    return Container(
      decoration: BoxDecoration(
        color: color,
        borderRadius: BorderRadius.circular(15),
        boxShadow: [
          BoxShadow(
            color: color.withOpacity(0.3),
            blurRadius: 10,
            offset: const Offset(0, 5),
          )
        ],
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(icon, color: Colors.white, size: 28),
          const SizedBox(height: 8),
          Text(
            val.toString(),
            style: const TextStyle(
              color: Colors.white,
              fontSize: 20,
              fontWeight: FontWeight.bold,
            ),
          ),
          Text(
            title,
            style: const TextStyle(
              color: Colors.white70,
              fontSize: 12,
              letterSpacing: 0.5,
            ),
          ),
        ],
      ),
    );
  }
}