using System.Collections.ObjectModel;
using System.IO;
using System.Text.Json;
using System.Windows;
using System.Windows.Threading;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LeagueAPI;
using LeagueAPI.ARAM;
using LeagueAPI.Models.ChampSelect;
using LeagueAPI.Models.DDragon.Champions;
using LeagueAPI.Models.GameClient;
using LeagueAPI.Models.ReadyCheck;
using LeagueAPI.Utils;

namespace ARAMUtility.ViewModel;

public partial class MainViewModel : ObservableObject, IDisposable
{
    private const int TEAM_CHAMPIONS_MAX = 5;
    private const int BENCH_CHAMPIONS_MAX = 10;

    public enum ConnectionStatus
    {
        Disconnected,
        Connecting,
        Connected,
    }

    private bool _isDisposed;
    private readonly Lock _syncRoot = new();
    private readonly SemaphoreSlim _championUpdateSemaphore = new(1, 1);

    private Dispatcher Dispatcher { get; } = Dispatcher.CurrentDispatcher;

    [ObservableProperty]
    public partial string Title { get; set; } = "ARAM Utility";

    [ObservableProperty]
    public partial ObservableCollection<ChampionViewModel> TeamChampions { get; private set; } = [];

    [ObservableProperty]
    public partial ObservableCollection<ChampionViewModel> BenchChampions { get; private set; } = [];

    [ObservableProperty]
    public partial bool IsDisconnected { get; private set; } = false;

    [ObservableProperty, NotifyPropertyChangedFor(nameof(ReconnectButtonVisibility))]
    public partial ConnectionStatus Status { get; private set; } = ConnectionStatus.Disconnected;
    public Visibility ReconnectButtonVisibility => Status == ConnectionStatus.Disconnected ? Visibility.Visible : Visibility.Collapsed;

    [ObservableProperty]
    public partial bool AutoAccept { get; set; } = true;

    private Dictionary<int, ChampionData> _allChampions = [];
    private List<int> _needChampionIds = [];
    private readonly APIClient _client = new();
    private readonly LcuWebsocket _lcuWebsocket = new();
    private Task _lcuWebsocketTask;
    private readonly ARAMBalanceService _aramBalanceService = new();
    private readonly ProcessWatcher _leagueWatcher = new();
    private readonly CachingHttpClient _localCachingClient = new(insecure: true);

    public MainViewModel()
    {
        _lcuWebsocket.Connecting += (_, _) => UpdateConnectionStatus(false, ConnectionStatus.Connecting);
        _lcuWebsocket.Connected += (_, _) => UpdateConnectionStatus(false, ConnectionStatus.Connected);
        _lcuWebsocket.Disconnected += (_, _) => UpdateConnectionStatus(true, ConnectionStatus.Disconnected);

        _lcuWebsocket.LcuApiEvent += OnLcuApiEvent;
#if DEBUG
        _lcuWebsocket.LcuApiException += (sender, e) =>
        {
            File.AppendAllText("socketerror.log", $"[{DateTime.Now:s}] {e.Message}\n{e.StackTrace}\n\n");
        };
#endif
        _lcuWebsocketTask = _lcuWebsocket.Connect();

        _leagueWatcher.LeagueOfLegendsExeFound += UpdateChampionListsFromGame;
    }

    internal async void OnInit(object? sender, RoutedEventArgs e)
    {
        ChampionData[] champions = await _client.GetAllChampionsAsync();
        Dictionary<int, ChampionData> championDictionary = champions
            .Where(c => c.Id != -1)
            .ToDictionary(key => key.Id);
        lock (_syncRoot)
        {
            _allChampions = championDictionary;
        }
        try
        {
            await UpdateNeedChampionIdsAsync();
        }
        catch (InvalidOperationException)
        {
            UpdateConnectionStatus(false, ConnectionStatus.Disconnected);
            return;
        }
        finally
        {
            await FillChampionLists();
        }
    }

    private void UpdateConnectionStatus(bool isConnected, ConnectionStatus status)
    {
        Dispatcher.Invoke(() =>
        {
            IsDisconnected = isConnected;
            Status = status;
        });
    }

    private async void OnLcuApiEvent(object? sender, LcuApiEvent apiEvent)
    {
        switch (apiEvent.Uri)
        {
            case "/lol-matchmaking/v1/ready-check":
                LolMatchmakingMatchmakingReadyCheckResource? readyCheck = apiEvent.Data.Deserialize<LolMatchmakingMatchmakingReadyCheckResource>();
                if (readyCheck is not null)
                {
                    if (readyCheck.PlayerResponse != LolMatchmakingMatchmakingReadyCheckResponse.Accepted)
                    {
                        if (AutoAccept)
                        {
                            await Task.Delay(TimeSpan.FromMilliseconds(Random.Shared.Next(100, 1500)));
                            await _client.MatchmakingAcceptAsync();
                        }
                    }
                    else
                    {
                        await UpdateNeedChampionIdsAsync();
                    }
                }
                break;
            case "/lol-champ-select/v1/session":
                ChampSelectSession? session = apiEvent.Data.Deserialize<ChampSelectSession>();
                await ShowChampionsAsync(session);
                break;
            default:
                File.AppendAllText("socket.log", $"{apiEvent.Uri}: {apiEvent.EventType} - {apiEvent.Data?.ToJsonString()}\n");
                break;
        }
    }

    private async Task UpdateNeedChampionIdsAsync()
    {
        IEnumerable<int> completedChampionIds = await _client.GetAllRandomAllChampionsCompletedChampionsAsync();
        IEnumerable<int> needChampionIds = _allChampions.Keys.Except(completedChampionIds);
        lock (_syncRoot)
        {
            _needChampionIds = [.. needChampionIds];
        }
    }

    private async Task FillChampionLists()
    {
        string defaultImagePath = await ResourceService.GetChampionIconPathAsync(-1);
        Dispatcher.Invoke(() =>
        {
            while (TeamChampions.Count < TEAM_CHAMPIONS_MAX)
            {
                TeamChampions.Add(GetEmptyChampionViewModel());
            }
            while (BenchChampions.Count < BENCH_CHAMPIONS_MAX)
            {
                BenchChampions.Add(GetEmptyChampionViewModel());
            }
        });

        ChampionViewModel GetEmptyChampionViewModel()
        {
            return new ChampionViewModel(new ChampionData()) { ImagePath = defaultImagePath, IsNeededForChallenge = false };
        }
    }

    private async Task ShowChampionsAsync(ChampSelectSession? session)
    {
        await _championUpdateSemaphore.WaitAsync();

        (IEnumerable<int> teamChampions, IEnumerable<int> benchChampions) = APIClient.GetSelectableChampionIds(session);
        if (!teamChampions.Any() && !benchChampions.Any())
        {
            TeamChampions.Clear();
            BenchChampions.Clear();
        }
        else
        {
            await UpdateChampions(TeamChampions, teamChampions);
            await UpdateChampions(BenchChampions, benchChampions);
        }

        await FillChampionLists();
        _championUpdateSemaphore.Release();
    }

    private async Task UpdateChampions(ObservableCollection<ChampionViewModel> viewModel, IEnumerable<int> championIds)
    {
        try
        {
            Dispatcher.Invoke(() => viewModel.Clear());
        }
        catch (NotSupportedException)
        {
            Dispatcher.Invoke(() =>
            {
                while (viewModel.Count > 0)
                {
                    viewModel.RemoveAt(0);
                }
            });
        }
        await _aramBalanceService.EnsureIsLoadedAsync();

        foreach (int championId in championIds)
        {
            ChampionData? championData = await _client.GetChampionByIdAsync(championId);
            if (championData is null || championData.Name is null)
            {
                continue;
            }

            string imagePath = await ResourceService.GetChampionIconPathAsync(championId);
            ChampionViewModel vm = new(championData with { AramBalance = _aramBalanceService.GetAramChampion(championData.Name) })
            {
                IsNeededForChallenge = _needChampionIds.Contains(championData.Id),
                ImagePath = imagePath,
            };
            Dispatcher.Invoke(() => { viewModel.Add(vm); });
        }
    }

    private async void UpdateChampionListsFromGame(object? sender, EventArgs e)
    {
        await Task.Delay(TimeSpan.FromSeconds(5));
        string playerlistJson = await _localCachingClient.GetStringAsync("https://127.0.0.1:2999/liveclientdata/playerlist", TimeSpan.FromSeconds(30));
        PlayerResponse[]? allPlayerResponse = JsonSerializer.Deserialize<PlayerResponse[]>(playerlistJson);
        if (allPlayerResponse is not { Length: > 0 })
        {
            return;
        }
        List<int> blueTeam = [];
        List<int> redTeam = [];
        foreach (PlayerResponse player in allPlayerResponse)
        {
            if (player.Team != TeamId.ORDER && player.Team != TeamId.CHAOS)
            {
                continue;
            }
            int championId = await _client.GetChampionIdByNameAsync(player.ChampionName);
            if (player.Team == TeamId.ORDER)
            {
                blueTeam.Add(championId);
            }
            if (player.Team == TeamId.CHAOS)
            {
                redTeam.Add(championId);
            }
        }
        await UpdateChampions(TeamChampions, blueTeam);
        await UpdateChampions(BenchChampions, redTeam);
        await FillChampionLists();
    }

    [RelayCommand(AllowConcurrentExecutions = false)]
    private async Task Connect()
    {
        if (_lcuWebsocketTask is null || _lcuWebsocketTask.IsCompleted)
        {
            _lcuWebsocketTask?.Dispose();
            _lcuWebsocketTask = _lcuWebsocket.Connect();
        }
    }

    [RelayCommand(AllowConcurrentExecutions = false)]
    private async Task OpenLobby()
    {
        await _client.CreateMayhemLobbyAsync();
    }

    [RelayCommand(AllowConcurrentExecutions = false)]
    private async Task StartQueueing()
    {
        await _client.StartMatchmakingQueueAsync();
    }

    [RelayCommand(AllowConcurrentExecutions = false)]
    private async Task ReloadARAMBalance()
    {
        await _aramBalanceService.ReloadAsync(force: true);
        MessageBox.Show("Reloaded ARAM balance data.", "Info", MessageBoxButton.OK, MessageBoxImage.Exclamation);
    }

    [RelayCommand]
    private async Task Quit()
    {
        Application.Current.Shutdown();
    }

    #region IDisposable
    protected virtual void Dispose(bool disposing)
    {
        if (!_isDisposed)
        {
            if (disposing)
            {
                _allChampions = [];
                _client?.Dispose();
                _lcuWebsocket?.Dispose();
                _localCachingClient?.Dispose();
            }

            _isDisposed = true;
        }
    }

    public void Dispose()
    {
        // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
        Dispose(disposing: true);
        GC.SuppressFinalize(this);
    }
    #endregion
}