using System;
using System.Collections.Generic;
using System.Net;
using System.Net.NetworkInformation;
using System.Threading.Tasks;
using SiteStatus.Dbo;

namespace SiteStatus.Business
{
    public class HostBusiness
    {
        public async Task<HostStatusDbo> GetHostStatusAsync(string host, int count, int timeout)
        {
            var hostStatus = new HostStatusDbo
            {
                Ip = host,
                Times = new List<long?>()
            };

            var tasks = new List<Task<PingReply>>();

            for (var i = 0; i < count; ++i)
            {
                try
                {
                    var ping = new Ping();
                    var pingTask = ping.SendPingAsync(host, timeout);
                    tasks.Add(pingTask);
                }
                catch (Exception e)
                {
                    hostStatus.Times.Add(null);
                }
            }

            foreach (var pingResult in await Task.WhenAll(tasks))
            {
                if (pingResult != null && pingResult.Status == IPStatus.Success)
                {
                    hostStatus.Times.Add(pingResult.RoundtripTime);
                }
                else
                {
                    hostStatus.Times.Add(null);
                }
            }

            try
            {
                var dnsResult = await Dns.GetHostEntryAsync(host);
                if (dnsResult != null)
                {
                    hostStatus.Hostname = dnsResult.HostName;
                }
                else
                {
                    hostStatus.Hostname = null;
                }
            }
            catch (Exception e)
            {
                hostStatus.Hostname = null;
            }

            return hostStatus;
        }
    }
}