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using System;
using XenAdmin.Core;
using XenAPI;


namespace XenAdmin.Actions.NRPE
{
    public class NRPERetrieveAction : AsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private readonly NRPEHostConfiguration _nrpeCurrentConfig;

        private readonly IXenObject _clone;

        public NRPERetrieveAction(IXenObject host, NRPEHostConfiguration nrpeHostConfiguration, bool suppressHistory)
            : base(host.Connection, Messages.NRPE_ACTION_RETRIEVING, Messages.NRPE_ACTION_RETRIEVING, suppressHistory)
        {
            _clone = host;
            _nrpeCurrentConfig = nrpeHostConfiguration;
        }

        protected override void Run()
        {
            _nrpeCurrentConfig.Status = NRPEHostConfiguration.RetrieveNRPEStatus.Successful;
            // For pool, retrieve the configuration from the master of the pool.
            IXenObject o = _clone is Pool p ? Helpers.GetCoordinator(p) : _clone;
            try
            {
                InitNRPEGeneralConfiguration(o);
                InitNRPEThreshold(o);
            }
            catch (Exception e)
            {
                log.ErrorFormat("Run NRPE plugin failed, failed reason: {0}", e.Message);
                _nrpeCurrentConfig.Status = NRPEHostConfiguration.RetrieveNRPEStatus.Failed;
            }
        }

        private void InitNRPEGeneralConfiguration(IXenObject o)
        {
            string status = Host.call_plugin(o.Connection.Session, o.opaque_ref, NRPEHostConfiguration.XAPI_NRPE_PLUGIN_NAME,
            NRPEHostConfiguration.XAPI_NRPE_STATUS, null);
            log.InfoFormat("Run NRPE {0}, return: {1}", NRPEHostConfiguration.XAPI_NRPE_STATUS, status);
            _nrpeCurrentConfig.EnableNRPE = status.Trim().Equals("active enabled");

            string nrpeConfig = Host.call_plugin(o.Connection.Session, o.opaque_ref, NRPEHostConfiguration.XAPI_NRPE_PLUGIN_NAME,
                NRPEHostConfiguration.XAPI_NRPE_GET_CONFIG, null);
            log.InfoFormat("Run NRPE {0}, return: {1}", NRPEHostConfiguration.XAPI_NRPE_GET_CONFIG, nrpeConfig);

            string[] nrpeConfigArray = nrpeConfig.Split('\n');
            foreach (string nrpeConfigItem in nrpeConfigArray)
            {
                if (nrpeConfigItem.Trim().StartsWith("allowed_hosts:"))
                {
                    string allowHosts = nrpeConfigItem.Replace("allowed_hosts:", "").Trim();
                    _nrpeCurrentConfig.AllowHosts = AllowHostsWithoutLocalAddress(allowHosts);
                }
                else if (nrpeConfigItem.Trim().StartsWith("debug:"))
                {
                    string enableDebug = nrpeConfigItem.Replace("debug:", "").Trim();
                    _nrpeCurrentConfig.Debug = enableDebug.Equals(NRPEHostConfiguration.DEBUG_ENABLE);
                }
                else if (nrpeConfigItem.Trim().StartsWith("ssl_logging:"))
                {
                    string enableSslLogging = nrpeConfigItem.Replace("ssl_logging:", "").Trim();
                    _nrpeCurrentConfig.SslLogging = enableSslLogging.Equals(NRPEHostConfiguration.SSL_LOGGING_ENABLE);
                }
            }
        }

        private void InitNRPEThreshold(IXenObject o)
        {
            string nrpeThreshold = Host.call_plugin(o.Connection.Session, o.opaque_ref, NRPEHostConfiguration.XAPI_NRPE_PLUGIN_NAME,
                NRPEHostConfiguration.XAPI_NRPE_GET_THRESHOLD, null);
            log.InfoFormat("Run NRPE {0}, return: {1}", NRPEHostConfiguration.XAPI_NRPE_GET_THRESHOLD, nrpeThreshold);

            string[] nrpeThresholdArray = nrpeThreshold.Split('\n');
            foreach (string nrpeThresholdItem in nrpeThresholdArray)
            {
                // Return string format for each line: check_cpu warning threshold - 50 critical threshold - 80
                string[] thresholdRtnArray = nrpeThresholdItem.Split(' ');
                _nrpeCurrentConfig.AddNRPECheck(new NRPEHostConfiguration.Check(thresholdRtnArray[0], 
                    thresholdRtnArray[4], thresholdRtnArray[8]));
            }
        }

        private static string AllowHostsWithoutLocalAddress(string allowHosts)
        {
            string updatedAllowHosts = "";
            string[] allowHostArray = allowHosts.Split(',');
            foreach (string allowHost in allowHostArray)
            {
                if (!allowHost.Trim().Equals("127.0.0.1") &&
                    !allowHost.Trim().Equals("::1"))
                {
                    updatedAllowHosts += allowHost + ",";
                }
            }
            return updatedAllowHosts.Length == 0 ? NRPEHostConfiguration.ALLOW_HOSTS_PLACE_HOLDER :
                updatedAllowHosts.Substring(0, updatedAllowHosts.Length - 1);
        }
    }
}