using Microsoft.AspNetCore.SignalR.Client;
using Remotely.Agent.Services;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace Remotely.Tests.LoadTester
{
    internal class Program
    {
        private static readonly SemaphoreSlim _lock = new(10, 10);
        private static readonly double _heartbeatMs = TimeSpan.FromMinutes(1).TotalMilliseconds;
        private static int _agentCount;
        private static string _organizationId;
        private static string _serverurl;
        private static DeviceInformationServiceWin _deviceInfo;

        private static void Main(string[] args)
        {
            _deviceInfo = new DeviceInformationServiceWin();
            ConnectAgents();

            Console.Write("Press Enter to exit...");
            Console.ReadLine();
        }

        private static void ConnectAgents()
        {
            try
            {
                if (!CommandLineParser.CommandLineArgs.ContainsKey("serverurl") ||
                       !CommandLineParser.CommandLineArgs.ContainsKey("organizationid") ||
                       !CommandLineParser.CommandLineArgs.ContainsKey("agentcount"))
                {
                    Console.WriteLine("Command line arguments must include all of the following: ");
                    Console.WriteLine();
                    Console.WriteLine("-serverurl [full URL of the Remotely server]");
                    Console.WriteLine();
                    Console.WriteLine("-organizationid [organization ID that the device will belong to]");
                    Console.WriteLine();
                    Console.WriteLine("-agentcount [the number of agent connections to simulate]");
                    Console.WriteLine();
                    Console.WriteLine("Press Enter to exit...");
                    Environment.Exit(0);
                }

                _agentCount = int.Parse(CommandLineParser.CommandLineArgs["agentcount"]);
                _organizationId = CommandLineParser.CommandLineArgs["organizationid"];
                _serverurl = CommandLineParser.CommandLineArgs["serverurl"];

                for (var i = 0; i < _agentCount; i++)
                {
                    _ = StartAgent(i);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("An error occurred.  Check your syntex.  Error: ");
                Console.WriteLine();
                Console.WriteLine(ex.Message);
            }
        }

        private static async Task StartAgent(int i)
        {
            try
            {
                await _lock.WaitAsync();

                var deviceId = Guid.NewGuid().ToString();

                var hubConnection = new HubConnectionBuilder()
                    .WithUrl(_serverurl + "/AgentHub")
                    .Build();

                Console.WriteLine("Connecting device number " + i.ToString());
                await hubConnection.StartAsync();

                var device = await _deviceInfo.CreateDevice(deviceId, _organizationId);
                device.DeviceName = "TestDevice-" + Guid.NewGuid();

                var result = await hubConnection.InvokeAsync<bool>("DeviceCameOnline", device);

                if (!result)
                {
                    Console.WriteLine($"Device {i} failed to come online.");
                    return;
                }

                
                _ = Task.Run(async () =>
                {
                    await Task.Delay(new Random().Next(1, (int)_heartbeatMs));
                    var heartbeatTimer = new System.Timers.Timer(_heartbeatMs);
                    heartbeatTimer.Elapsed += async (sender, args) =>
                    {
                        var currentInfo = await _deviceInfo.CreateDevice(device.ID, _organizationId);
                        currentInfo.DeviceName = device.DeviceName;
                        await hubConnection.SendAsync("DeviceHeartbeat", currentInfo);
                    };
                    heartbeatTimer.Start();
                });
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Device {i} failed to connect.");
                Console.WriteLine(ex.Message);
            }
            finally
            {
                _lock.Release();
            }
        }
    }
}