import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
import 'custom_info_card.dart'; // Ensure this path is correct

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  static const Color primaryColor = Color.fromARGB(255, 254, 100, 91);
  static const Color secondaryColor = Colors.orange;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Info Cards',
      theme: ThemeData(
        primaryColor: primaryColor,
        appBarTheme: const AppBarTheme(
          backgroundColor: primaryColor,
          elevation: 0,
        ),
      ),
      home: const HomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  List<Map<String, dynamic>> infoCards = [];
  static const String googleSheetUrl = 'https://script.google.com/macros/s/AKfycbw1htmk7rlwLMOkOrpZ9ED-7ErWgMlYNtLKxoQ9QO-FopqTAhJuQkR7Gs1LxTJakbMT/exec';

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

  Future<void> _loadInfoCards() async {
    final prefs = await SharedPreferences.getInstance();

    // Load default data if no saved data
    String? savedData = prefs.getString('infoCardsData');
    setState(() {
      if (savedData != null) {
        try {
          final decoded = json.decode(savedData);
          infoCards = List<Map<String, dynamic>>.from(decoded);
        } catch (e) {
          if (kDebugMode) {
            print('Error decoding saved data: $e');
          }
          infoCards = _defaultInfoCards();
        }
      } else {
        infoCards = _defaultInfoCards();
      }
    });
  
    await _fetchUpdatedData();
  }

  List<Map<String, dynamic>> _defaultInfoCards() {
    return [
      {
        'image': 'assets/icons/icono1.jpg',
        'title': 'Tutorias de programación',
        'subtitle': '8:00am a 11:30am En biblioteca Lázaro',
      },
    ];
  }

  Future<void> _fetchUpdatedData() async {    
    try {
      final response = await http.get(Uri.parse(googleSheetUrl));
      if (response.statusCode == 200 && response.body.isNotEmpty) {
        try {
          final dynamic decodedData = json.decode(response.body);
          List<Map<String, dynamic>> newData = [];
          
          if (decodedData is Map && decodedData.containsKey('feed')) {
            final entries = decodedData['feed']['entry'] as List?;
            if (entries != null) {
              for (var entry in entries) {
                final Map<String, dynamic> card = {
                  'image': entry['gsx\$image']?['\$t'] ?? '',
                  'title': entry['gsx\$title']?['\$t'] ?? '',
                  'subtitle': entry['gsx\$subtitle']?['\$t'] ?? '',
                };
                newData.add(card);
              }
            }
          } else if (decodedData is List) {
            newData = List<Map<String, dynamic>>.from(decodedData);
          } else {
            throw Exception('Unexpected JSON format');
          }

          if (json.encode(newData) != json.encode(infoCards)) {
            setState(() {
              infoCards = newData;
            });
            final prefs = await SharedPreferences.getInstance();
            prefs.setString('infoCardsData', json.encode(newData));
            
            if (kDebugMode) {
              print('Updated with new data from Google Sheet');
            }
          }
        } catch (e) {
          if (kDebugMode) {
            print('Error parsing response data: $e');
          }
        }
      } else {
        if (kDebugMode) {
          print('Failed to fetch updated data: ${response.statusCode}');
        }
      }
    } catch (e) {
      if (kDebugMode) {
        print('Error fetching data: $e');
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        flexibleSpace: Padding(
          padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
          child: Image.asset(
            'assets/header_image.png',
            fit: BoxFit.cover,
          ),
        ),
        toolbarHeight: MediaQuery.of(context).size.height * 0.19,
      ),
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            colors: [MyApp.primaryColor, MyApp.secondaryColor],
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
          ),
        ),
        child: SafeArea(
          child: Column(
            children: [
              Expanded(
                child: RefreshIndicator(
                  onRefresh: _fetchUpdatedData,
                  color: MyApp.primaryColor,
                  child: ListView.builder(
                    padding: const EdgeInsets.all(0),
                    itemCount: infoCards.isEmpty ? 1 : infoCards.length,
                    itemBuilder: (context, index) {
                      // Show error widget if no data is available
                      if (infoCards.isEmpty) {
                        return Card(
                          margin: const EdgeInsets.all(16),
                          color: Colors.white,
                          child: Padding(
                            padding: const EdgeInsets.all(16),
                            child: Column(
                              children: [
                                const Icon(Icons.warning_amber_rounded, 
                                  size: 48, color: Colors.orange),
                                const SizedBox(height: 16),
                                const Text(
                                  'No se pudo cargar la información',
                                  style: TextStyle(
                                    fontSize: 18,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                                const SizedBox(height: 8),
                                const Text(
                                  'Desliza hacia abajo para intentar de nuevo',
                                  textAlign: TextAlign.center,
                                ),
                                const SizedBox(height: 16),
                                ElevatedButton(
                                  onPressed: () => _fetchUpdatedData(),
                                  style: ElevatedButton.styleFrom(
                                    backgroundColor: MyApp.primaryColor,
                                  ),
                                  child: const Text('Reintentar'),
                                ),
                              ],
                            ),
                          ),
                        );
                      }
                      
                      // Show data card
                      final card = infoCards[index];
                      return CustomInfoCard(
                        imagePath: "assets/icons/${card['image']}",
                        title: card['title'],
                        subtitle: card['subtitle'],
                      );
                    },
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}