using System.ComponentModel;
using System.Windows.Input;
using CommunityToolkit.Mvvm.Input;
using ClientApiPoC.OnPremiseApp.Services;
using ClientApiPoC.Shared;
using ClientApiPoC.Shared.Wpf;
using ClientApiPoC.Shared.SignalR;

namespace ClientApiPoC.OnPremiseApp {
    public class MainWindowViewModel : BaseViewModel {
        private ClientDataService _clientDataService;
        private TunnelClient _tunnelClient;

        #region Properties
        private string _apiServiceUrl = "http://localhost:5228/";
        public string ApiServiceUrl {
            get => _apiServiceUrl;
            set {
                _apiServiceUrl = value;
                OnPropertyChanged(nameof(ApiServiceUrl));
            }
        }

        private bool _tunnelClientIsConnecting = false;
        public bool TunnelClientIsConnecting {
            get => _tunnelClientIsConnecting;
            set {
                _tunnelClientIsConnecting = value;
                OnPropertyChanged(nameof(TunnelClientIsConnecting));
                OnPropertyChanged(nameof(ConnectButtonEnabled));
                OnPropertyChanged(nameof(UrlTextFieldEnabled));
            }
        }

        public bool TunnelClientConnected => (_tunnelClient.IsConnected || _tunnelClient.IsConnecting);

        public string ConnectButtonText => (this.TunnelClientConnected ? "Disconnect" : "Connect");

        public bool ConnectButtonEnabled => !this.TunnelClientIsConnecting;

        public bool UrlTextFieldEnabled => !this.TunnelClientIsConnecting && !this.TunnelClientConnected;

        private string _localClientData = "";
        public string LocalClientData {
            get => _localClientData;
            set {
                _localClientData = value;
                OnPropertyChanged(nameof(LocalClientData));
                OnPropertyChanged(nameof(SetLocalClientDataButtonEnabled));
            }
        }

        public bool SetLocalClientDataButtonEnabled {
            get {
                if (string.IsNullOrEmpty(this.LocalClientData) && string.IsNullOrEmpty(_clientDataService.ClientData)) return false;
                return !string.Equals(this.LocalClientData, _clientDataService.ClientData);
            }
        }
        #endregion

        #region Commands
        public ICommand ToggleConnectionCommand { get; }

        public ICommand SetLocalClientDataCommand { get; }
        #endregion

        public MainWindowViewModel(ClientDataService clientDataService) {
            if (clientDataService == null) throw new ArgumentNullException(nameof(clientDataService));
            _clientDataService = clientDataService;
            _tunnelClient = new TunnelClient();
            _tunnelClient.PropertyChanged += TunnelClient_PropertyChanged;
            this.ToggleConnectionCommand = new AsyncRelayCommand(ToggleConnectionAsync);
            this.SetLocalClientDataCommand = new AsyncRelayCommand(SetLocalClientDataAsync);
        }

        private void TunnelClient_PropertyChanged(object? sender, PropertyChangedEventArgs e) {
            OnPropertyChanged(nameof(TunnelClientConnected));
            OnPropertyChanged(nameof(ConnectButtonText));
            OnPropertyChanged(nameof(UrlTextFieldEnabled));
        }

        private async Task ToggleConnectionAsync() {
            if (this.TunnelClientIsConnecting) return;
            try {
                this.TunnelClientIsConnecting = true;
                if (this.TunnelClientConnected) {
                    await _tunnelClient.DisconnectAsync();
                } else {
                    var url = this.ApiServiceUrl;
                    if (string.IsNullOrWhiteSpace(url)) throw new Exception("Please provide a base url.");
                    while (url.EndsWith('/')) url = url[..^1];
                    url += Routes.TUNNEL_PATH;
                    await _tunnelClient.ConnectAsync(url, _clientDataService.ConfigureTunnelActions);
                }
            } catch (Exception ex) {
                await HandleErrorAsync(ex);
            } finally {
                this.TunnelClientIsConnecting = false;
            }
        }

        private async Task SetLocalClientDataAsync() {
            try {
                string? newClientData = this.LocalClientData;
                if (string.IsNullOrEmpty(newClientData)) newClientData = null;
                _clientDataService.ClientData = newClientData;
            } catch (Exception ex) {
                await HandleErrorAsync(ex);
            } finally {
                OnPropertyChanged(nameof(SetLocalClientDataButtonEnabled));
            }
        }
    }
}