import 'dart:async';
import 'package:flutter/material.dart';
import 'dart:math';
import 'package:flutter_fortune_wheel/flutter_fortune_wheel.dart';
import 'package:pvt15/pages/game_page.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;

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

  @override
  State<WheelPage> createState() => _WheelPageState();
}

class _WheelPageState extends State<WheelPage> {
  final StreamController<int> controller = StreamController<int>();
  Map<String, dynamic> challenges = {};

  // A list of game titles that represent the segments of the wheel.
  List<String> wheelItems = [];

  // Closes the controller's stream when the widget is disposed.
  // This ensures proper cleanup of resources and prevents memory leaks.
  @override
  void dispose() {
    controller.close();
    super.dispose();
  }

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

  void initializeChallenge() async {
    await fetchChallenges();
    setState(() { // Load the challenge
      _loadChallenges();
    });
  }

  // Simulates a spin of the fortune wheel by generating a random index.
  void _spin() {
    final result = Random().nextInt(wheelItems.length);
    controller.add(result);
  }

  // Returns a description for the given title.
  String _getDescriptionFor(String title) {
    switch (title) {
      case 'Rita & gissa':
        return 'Text';
      case 'Charader':
        return 'Text';
      case 'Dansbattle':
        return 'Text';
      case 'Gissa låten':
        return 'Text';
      case 'Sanningar':
        return 'Text';
      case 'Selfiejakt':
        return 'Text';
      default:
        return 'Okänt spel';
    }
  }
  
   // Builds the main UI for the wheel screen.
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color.fromARGB(248, 180, 8, 129),
      body: Center(
        child: wheelItems.isEmpty ? const CircularProgressIndicator() // Waiting for wheel to build
        :GestureDetector(
          onTap: _spin, 
          child: _buildWheelContainer(),
        ),
      ),
    );
  }

  // Builds the main container that holds the fortune wheel and its instructional text.
  Widget _buildWheelContainer() {
    return Container(
      height: 500,
      width: 370,
      decoration: BoxDecoration(
        color: const Color.fromARGB(255, 153, 101, 150),
        borderRadius: BorderRadius.circular(40),
      ),
      child: Stack(
        alignment: Alignment.center,
        children: [
          _buildContainerText(),
          _buildWheel(),
        ],
      ),
    );
  }

  // Builds the wheel and listens to spins and triggers an action when the animation ends.
  Widget _buildWheel() {
    return SizedBox(
      width: 320,
      height: 320,
      child: FortuneWheel(
        animateFirst: false,
        selected: controller.stream,
         onAnimationEnd: _handleWheelResult,
        items: _buildWheelItems(),
        indicators: <FortuneIndicator>[
          _buildFortuneIndicator(),
        ],
      ),
    );
  }

  // Build fortune indicator
  _buildFortuneIndicator() {
    return FortuneIndicator(
      alignment: Alignment.topCenter,
      child: Container(
        width: 12,
        height: 12,
        decoration: BoxDecoration(
          color: Colors.white,
          shape: BoxShape.circle,
        ),
      ),
    );
  }

  // Builds a text widget that instructs the user to click on the wheel
  Widget _buildContainerText() {
    return Positioned(
      top: 20,
      child: Text(
        'Klicka på hjulet!',
        style: TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.bold,
          color: Colors.white,
        ),
      ),
    );
  }
  
  // Builds and returns the list of FortuneItem widgets that make up the wheel's segments
  List<FortuneItem> _buildWheelItems() {
    return wheelItems.map(
      (item) => FortuneItem(
        child: Text(
          item,
          style: const TextStyle(
            fontSize: 18,
            color: Colors.white,
            fontWeight: FontWeight.bold,
          ),
        ),
      ),
    ).toList();
  }


  // Handles the result of the wheel spin.
  // It retrieves the selected item's title and description, then navigates to corresponding gamePage
  void _handleWheelResult() {
    String selectedTitle = "Charader";
    final selectedDescription = _getDescriptionFor(selectedTitle);
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => GamePage(
          title: selectedTitle,
          description: selectedDescription,
        ),
      ),
    );
  }
  
  // Fetch the challenges through the api
  Future<void> fetchChallenges() async {
    final url = Uri.parse('https://group-1-15.pvt.dsv.su.se/api/challenges');
    try {
      final response = await http.get(url);
      if (response.statusCode == 200) { // (HTTP 200 OK)
        challenges = jsonDecode(utf8.decode(response.bodyBytes)); // convert the JSON string into a map
        // var charaderChallenges = challenges["Charader"];
        // debugPrint("Charader challenges: $charaderChallenges");
        // debugPrint(challenges.toString());
      } 
    } catch (e) {
      debugPrint('Ett fel inträffade vid anrop till backend: $e');
      throw Exception('Ett fel inträffade vid anrop till backend: $e');
    }
  }

  void _loadChallenges() async {
    wheelItems = challenges.keys.toList(); 
  }
}