using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.SignalR.Client;
using RobotNet10.RobotApp.Client.Shared.Plc;

namespace RobotNet10.RobotApp.Client.Clients;

/// <summary>
/// SignalR client để kết nối với PlcControllerHub (read-only)
/// </summary>
public class PlcControllerHubClient : IAsyncDisposable
{
    private readonly HubConnection _hubConnection;
    private bool _disposed;

    public bool IsConnected => _hubConnection.State == HubConnectionState.Connected;
    public HubConnectionState ConnectionState => _hubConnection.State;

    /// <summary>
    /// Event fired when connection state changes
    /// </summary>
    public event Action<HubConnectionState>? ConnectionStateChanged;

    public PlcControllerHubClient(NavigationManager navigationManager)
    {
        var hubUrl = navigationManager.ToAbsoluteUri("/hubs/plc/controller");

        _hubConnection = new HubConnectionBuilder()
            .WithUrl(hubUrl)
            .WithAutomaticReconnect()
            .Build();

        _hubConnection.Reconnecting += async (ex) =>
        {
            ConnectionStateChanged?.Invoke(_hubConnection.State);
            await Task.CompletedTask;
        };

        _hubConnection.Reconnected += async (id) =>
        {
            ConnectionStateChanged?.Invoke(_hubConnection.State);
            await Task.CompletedTask;
        };

        _hubConnection.Closed += async (ex) =>
        {
            ConnectionStateChanged?.Invoke(_hubConnection.State);
            await Task.CompletedTask;
        };
    }

    /// <summary>
    /// Connect to hub
    /// </summary>
    public async Task StartAsync()
    {
        if (_hubConnection.State == HubConnectionState.Disconnected)
        {
            await _hubConnection.StartAsync();
            ConnectionStateChanged?.Invoke(_hubConnection.State);
        }
    }

    /// <summary>
    /// Disconnect from hub
    /// </summary>
    public async Task StopAsync()
    {
        if (_hubConnection.State != HubConnectionState.Disconnected)
        {
            await _hubConnection.StopAsync();
        }
    }

    /// <summary>
    /// Get current status
    /// </summary>
    public async Task<PlcControllerStatusDto> GetStatusAsync()
    {
        return await _hubConnection.InvokeAsync<PlcControllerStatusDto>("GetStatus");
    }

    public async ValueTask DisposeAsync()
    {
        if (_disposed)
            return;

        _disposed = true;

        await StopAsync();
        await _hubConnection.DisposeAsync();
    }
}