import 'package:flutter/material.dart';
import 'package:mini_golf/scorekeeper.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'dart:convert';

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

  void _showLoadGameDialog(BuildContext context) async {
    final prefs = await SharedPreferences.getInstance();
    final gameKeys = prefs.getKeys()
        .where((key) => key.startsWith('game_'))
        .toList();

    if (gameKeys.isEmpty) {
      // No games found, show a SnackBar instead
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('No saved games found.')),
      );
      return;
    }

    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          title: const Text('Select a Game to Load'),
          content: SingleChildScrollView(
            child: ListBody(
              children: gameKeys.map((key) {
                return ListTile(
                  title: Text(key.substring(5).substring(0, 16).replaceAll(
                      "T", " ")),
                  onTap: () {
                    _loadGame(context, key);
                  },
                );
              }).toList(),
            ),
          ),
        );
      },
    );
  }

  Future<void> _loadGame(BuildContext context, String gameKey) async {
    final prefs = await SharedPreferences.getInstance();
    final gameDataJson = prefs.getString(gameKey);
    if (gameDataJson != null) {
      final gameData = jsonDecode(gameDataJson);
      // Assuming gameData structure. Convert data types as necessary.
      Navigator.of(context).pop(); // Close the selection dialog
      Navigator.push(
        context,
        MaterialPageRoute(
          builder: (context) =>
              ScoreKeeper(
                isNewGame: false,
                playerNames: List<String>.from(gameData['playerNames']),
                pars: Map.from(gameData['pars']).map((k, v) =>
                    MapEntry(int.parse(k), v)),
                scores: Map.from(gameData['scores']).map((k, v) =>
                    MapEntry(int.parse(k), List<int>.from(v))),
                gameCreationTime: DateTime.parse(gameData['creationTime']),
              ),
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Mini Golf Main Menu'),
      ),
      body: Column(
        children: [
          const Spacer(),
          // Pushes everything below it towards the middle and bottom of the screen
          // Main action buttons centered in the middle of the screen
          ElevatedButton(
            child: const Text('Start New Game'),
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                    builder: (context) => const ScoreKeeper(isNewGame: true)),
              );
            },
          ),
          const SizedBox(height: 16),
          // Space between the buttons
          ElevatedButton(
            child: const Text('Load Game'),
            onPressed: () => _showLoadGameDialog(context),
          ),
          const Spacer(),
          // This will push the bottom content to the bottom of the screen
          // Information buttons at the bottom
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            // Space out the buttons evenly in the Row
            children: [
              // About Button
              ElevatedButton(
                onPressed: () async {
                  PackageInfo packageInfo = await PackageInfo.fromPlatform();
                  String version = packageInfo.version;

                  showDialog(
                    context: context,
                    builder: (BuildContext context) {
                      return AlertDialog(
                        title: const Text('About'),
                        content: SingleChildScrollView(
                          child: ListBody(
                            children: <Widget>[
                              const Text('Mini Golf Scorekeeper App'),
                              const Text('Made by Connor Frank'),
                              const Text('Princeton NJ April 2024'),
                              Text('Version: $version'), // Display app version
                              // Add more about info here
                            ],
                          ),
                        ),
                        actions: <Widget>[
                          TextButton(
                            child: const Text('OK'),
                            onPressed: () {
                              Navigator.of(context).pop();
                            },
                          ),
                        ],
                      );
                    },
                  );
                },
                child: const Text('About'),
              ),
              // License Button
              ElevatedButton(
                onPressed: () {
                  // Action for License button
                  showLicensePage(context: context);
                },
                child: const Text('License'),
              ),
              // GitHub Link Button
              ElevatedButton(
                onPressed: () async {
                  Uri link = Uri(scheme: 'https',
                    host: 'github.com',
                    path: '/conjfrnk/mini-golf-scores');
                  if (await canLaunchUrl(link)) {
                    await launchUrl(link);
                  } else {
                    ScaffoldMessenger.of(context).showSnackBar(
                      const SnackBar(content: Text('Could not open GitHub')),
                    );
                  }
                },
                child: const Text(
                    'GitHub'), // You can use an Icon instead: Icon(Icons.link)
              ),
            ],
          ),
          const SizedBox(height: 20),
          // Ensures there's space at the very bottom
        ],
      ),
    );
  }
}