using System;
using System.Collections.Generic;
using System.Text;

namespace BizTalkCheckmkPulse
{
    /// <summary>
    /// Einstiegspunkt des Checkmk Local Checks.
    /// </summary>
    internal static class Program
    {
        /// <summary>
        /// Laedt die Konfiguration, fuehrt die Probes aus und schreibt Checkmk-Zeilen nach STDOUT.
        /// </summary>
        /// <param name="args">Kommandozeilenargumente wie <c>--self-test</c> oder <c>--environment</c>.</param>
        /// <returns>Immer 0, damit Diagnosefehler als UNKNOWN-Service statt als kaputte Agent-Sektion erscheinen.</returns>
        private static int Main(string[] args)
        {
            MonitoringOptions options = null;

            try
            {
                Console.OutputEncoding = new UTF8Encoding(false);
                options = MonitoringOptions.Load(args);
                var formatter = new CheckmkLocalFormatter(options);

                if (options.SelfTest)
                {
                    foreach (var line in formatter.FormatSelfTest())
                    {
                        Console.WriteLine(line);
                    }

                    return 0;
                }

                var result = new ProbeResult();
                var wmiProbe = new WmiBizTalkProbe(options);
                wmiProbe.Query(result);

                // Der SQL-Test verwendet bewusst dieselbe Windows-Identitaet wie der Checkmk-Agent.
                var sqlProbe = new SqlConnectivityProbe(options);
                sqlProbe.Query(result);

                if (options.ProbeEventLog)
                {
                    var eventLogProbe = new EventLogProbe(options);
                    eventLogProbe.Query(result);
                }

                foreach (var line in formatter.Format(result))
                {
                    Console.WriteLine(line);
                }

                return 0;
            }
            catch (Exception ex)
            {
                var fallbackOptions = options ?? new MonitoringOptions();
                var formatter = new CheckmkLocalFormatter(fallbackOptions);
                foreach (var line in formatter.FormatFatal("BizTalk Checkmk Pulse failed: " + ex.GetType().Name + ": " + ex.Message))
                {
                    Console.WriteLine(line);
                }

                return 0;
            }
        }
    }
}