import 'dart:convert';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
import '../../globals.dart';

class ProfilePage extends StatefulWidget {
  @override
  _ProfilePageState createState() => _ProfilePageState();
}

class _ProfilePageState extends State<ProfilePage> {
  bool _isLoading = true;
  String? _name;
  int? _uid;
  int? _elo;
  double? _mu;
  double? _unc;
  List<dynamic> _matches = [];

  final String _getProfileApiUrl = '$apiurl/getprofile';

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

  Future<void> _fetchProfileData() async {
    final prefs = await SharedPreferences.getInstance();
    final String? token = prefs.getString('token');

    if (token == null) {
      _showToast('No token found. Please login again.');
      return;
    }

    try {
      final response = await http.post(
        Uri.parse(_getProfileApiUrl),
        headers: {'Content-Type': 'application/json'},
        body: json.encode({'token': token}),
      );

      if (response.statusCode == 200) {
        final data = json.decode(response.body);
        setState(() {
          _name = data['name'];
          _uid = data['uid'];
          _elo = data['elo'];
          _mu = data['osk_mu'];
          _unc = data['osk_sig'];
          _matches = data['matches'];
          _isLoading = false;
        });
      } else {
        _showToast('Failed to fetch profile data.');
      }
    } catch (e) {
      _showToast('Error: $e');
    }
  }

  Color _generateRandomColor() {
    final random = Random();
    return Color.fromARGB(
      255,
      random.nextInt(256),
      random.nextInt(256),
      random.nextInt(256),
    );
  }

  void _showToast(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message)),
    );
  }

  String getRankImage(int? elo) {
    if (elo == null) return '$apiurl/assets/none.png';
    if (elo > 1000) return '$apiurl/assets/U.png';
    if (elo > 750) return '$apiurl/assets/S.png';
    if (elo > 400) return '$apiurl/assets/A.png';
    if (elo > 200) return '$apiurl/assets/B.png';
    if (elo > 100) return '$apiurl/assets/C.png';
    if (elo > 30) return '$apiurl/assets/D.png';
    return '$apiurl/assets/none.png';
  }

  void _showExplanationDialog() {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('ELO, OSK, and UNC Explanation'),
          content: SingleChildScrollView(
            child: ListBody(
              children: <Widget>[
                // ELO Section
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      "ELO (Elo Rating):",
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    SizedBox(height: 4.0),
                    Text(
                      "ELO is a widely-used rating system designed to measure the relative skill levels of players in two-player games. It was my initial pick for a testing environment since I only really thought about 1v1 matches, and because it had a readily available Python implementation. I'm lazy.",
                    ),
                    SizedBox(height: 8.0),
                  ],
                ),
                // OSK Section
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      "OSK (OpenSkill Mu):",
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    SizedBox(height: 4.0),
                    Text(
                      "OSKmu is a skill rating system based on the OpenSkill model, which is a probabilistic framework for estimating a player's skill. Unlike ELO, which is purely a point-based system, OpenSkill Mu takes into account not just the outcome of matches but also the degree of uncertainty in a player's skill estimation. Since I set up the system to have a 0-base-elo, I had to adapt the OpenSkill implementation to a standard 25 OSK and 8.33 uncertainty.",
                    ),
                    SizedBox(height: 8.0),
                  ],
                ),
                // UNC Section
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      "Uncertainty (UNC):",
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    SizedBox(height: 4.0),
                    Text(
                      "This is a measure of how confident the system is about a player's skill rating. A higher uncertainty value means the system is less confident about the accuracy of the player's skill estimation, while a lower uncertainty indicates more confidence in the player's rating.",
                    ),
                  ],
                ),
              ],
            ),
          ),
          actions: <Widget>[
            TextButton(
              child: Text('Close'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _isLoading
          ? Center(child: CircularProgressIndicator())
          : RefreshIndicator(
              onRefresh: _fetchProfileData,
              child: Column(
                children: [
                  // Profile Details
                  Container(
                    padding: EdgeInsets.all(16.0),
                    child: Row(
                      children: [
                        CircleAvatar(
                          backgroundColor: _generateRandomColor(),
                          child: Text(
                            _name != null && _name!.isNotEmpty
                                ? _name![0].toUpperCase()
                                : '?',
                            style: TextStyle(fontSize: 24, color: Colors.white),
                          ),
                          radius: 40,
                        ),

                        SizedBox(width: 16),
                        // Profile Info
                        Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Text(
                              _name ?? 'Name not available',
                              style: TextStyle(
                                fontSize: 24,
                                fontWeight: FontWeight.bold,
                              ),
                            ),
                            SizedBox(height: 6),
                            Text('UID: ${_uid ?? 'N/A'}'),
                            Row(
                              children: [
                                Text(
                                    'ELO: ${_elo ?? 'N/A'} | OSK: ${_mu != null ? _mu?.toStringAsFixed(3) : 'N/A'} | UNC: ${_unc != null ? _unc?.toStringAsFixed(3) : 'N/A'}'),
                                IconButton(
                                  icon: Icon(Icons.help_outline),
                                  onPressed: _showExplanationDialog,
                                  tooltip: 'What are ELO, OSK, and UNC?',
                                ),
                              ],
                            ),
                          ],
                        ),
                        SizedBox(width: 25),
                        Image.network(
                          getRankImage(_elo),
                          width: 137,
                          height: 137,
                        ),
                      ],
                    ),
                  ),
                  // Recent Matches
                  Expanded(
                    child: _matches.isEmpty
                        ? Center(
                            child: Text(
                              "You haven't played any matches yet",
                              style: TextStyle(
                                fontSize: 16,
                                color: Colors.grey,
                              ),
                            ),
                          )
                        : ListView.builder(
                            itemCount: _matches.length,
                            itemBuilder: (context, index) {
                              final match = _matches[index];
                              final result = match['result'];
                              final eloChange = match['elo_change'];

                              return Card(
                                margin: EdgeInsets.symmetric(
                                    horizontal: 16.0, vertical: 8.0),
                                child: Padding(
                                  padding: const EdgeInsets.all(16.0),
                                  child: Column(
                                    crossAxisAlignment:
                                        CrossAxisAlignment.start,
                                    children: [
                                      Text(
                                        'Match ID: ${match['match_id']}',
                                        style: TextStyle(
                                          fontSize: 16,
                                          fontWeight: FontWeight.bold,
                                        ),
                                      ),
                                      Text(
                                          'Opponent: ${match['opponent_name']}'),
                                      Row(
                                        children: [
                                          Text(
                                            '$result',
                                            style: TextStyle(
                                              fontWeight: FontWeight.bold,
                                              color: result == 'Win'
                                                  ? Colors.green
                                                  : Colors.red,
                                            ),
                                          ),
                                          SizedBox(width: 16),
                                          if (eloChange != null)
                                            Text(
                                              'ELO Change: ${eloChange > 0 ? '+' : ''}$eloChange',
                                              style: TextStyle(
                                                color: eloChange > 0
                                                    ? Colors.green
                                                    : Colors.red,
                                              ),
                                            ),
                                        ],
                                      ),
                                    ],
                                  ),
                                ),
                              );
                            },
                          ),
                  ),
                ],
              ),
            ),
    );
  }
}