using System;
using System.Collections.Generic;

namespace BizTalkCheckmkPulse
{
    /// <summary>
    /// Definiert die von Checkmk erwarteten numerischen Service-Zustaende.
    /// </summary>
    internal enum CheckState
    {
        Ok = 0,
        Warning = 1,
        Critical = 2,
        Unknown = 3
    }

    /// <summary>
    /// Unterscheidet fortsetzbare und nicht fortsetzbare suspendierte Instanzen.
    /// </summary>
    internal enum SuspendedKind
    {
        Resumable,
        NonResumable
    }

    /// <summary>
    /// Kennzeichnet den technischen Bereich, in dem eine Diagnose entstanden ist.
    /// </summary>
    internal enum DiagnosticArea
    {
        Wmi,
        Sql,
        EventLog,
        General
    }

    /// <summary>
    /// Klassifiziert Fehler, damit Bediener eine passende Massnahme erhalten.
    /// </summary>
    internal enum DiagnosticCategory
    {
        Permission,
        Connectivity,
        Timeout,
        Configuration,
        Provider,
        Unexpected
    }

    /// <summary>
    /// Strukturierte Diagnose mit Ursache und konkreter Handlungsempfehlung.
    /// </summary>
    internal sealed class ProbeDiagnostic
    {
        public DiagnosticArea Area { get; set; }
        public DiagnosticCategory Category { get; set; }
        public string Component { get; set; }
        public bool Required { get; set; }
        public string Summary { get; set; }
        public string Action { get; set; }
        public string TechnicalDetails { get; set; }

        /// <summary>
        /// Erstellt eine kompakte, fuer Checkmk geeignete Diagnosezeile.
        /// </summary>
        /// <returns>Menschenlesbarer Text mit Kategorie, Ursache und Massnahme.</returns>
        public string ToDisplayText()
        {
            var text = Area + "/" + Category + " [" + (Component ?? "unknown") + "]: " + (Summary ?? "Unbekannter Fehler.");
            if (!string.IsNullOrWhiteSpace(Action))
            {
                text += " Massnahme: " + Action;
            }

            if (!string.IsNullOrWhiteSpace(TechnicalDetails))
            {
                text += " Technik: " + TechnicalDetails;
            }

            return text;
        }
    }

    /// <summary>
    /// Sammelt alle Ergebnisse eines Programmlaufs.
    /// </summary>
    internal sealed class ProbeResult
    {
        /// <summary>
        /// Initialisiert leere Ergebnislisten und Zustandsobjekte.
        /// </summary>
        public ProbeResult()
        {
            Diagnostics = new List<ProbeDiagnostic>();
            Platform = new PlatformState();
            HostInstances = new List<HostInstanceState>();
            SuspendedInstances = new List<SuspendedInstance>();
            Applications = new List<ApplicationRuntimeState>();
            SqlTargets = new List<SqlAccessState>();
            EventLog = new EventLogState();
        }

        public List<ProbeDiagnostic> Diagnostics { get; private set; }
        public PlatformState Platform { get; private set; }
        public List<HostInstanceState> HostInstances { get; private set; }
        public List<SuspendedInstance> SuspendedInstances { get; private set; }
        public List<ApplicationRuntimeState> Applications { get; private set; }
        public List<SqlAccessState> SqlTargets { get; private set; }
        public string ExecutionIdentity { get; set; }
        public string NetworkIdentityHint { get; set; }
        public EventLogState EventLog { get; private set; }
    }

    /// <summary>
    /// Beschreibt Erreichbarkeit und Teilverfuegbarkeit der BizTalk-WMI-Daten.
    /// </summary>
    internal sealed class PlatformState
    {
        public bool WmiConnected { get; set; }
        public bool PlatformDataAvailable { get; set; }
        public bool HostInstancesDataAvailable { get; set; }
        public bool SuspendedInstancesDataAvailable { get; set; }
        public bool RuntimeArtifactsDataAvailable { get; set; }
        public string ServerName { get; set; }
        public string GroupName { get; set; }
        public string ManagementDbServer { get; set; }
        public string ManagementDbName { get; set; }
        public string MessageBoxDbServer { get; set; }
        public string MessageBoxDbName { get; set; }
    }

    /// <summary>
    /// Ergebnis der integrierten Anmeldung an einer BizTalk-Datenbank.
    /// </summary>
    internal sealed class SqlAccessState
    {
        public string Role { get; set; }
        public string Server { get; set; }
        public string Database { get; set; }
        public bool Attempted { get; set; }
        public bool Available { get; set; }
        public DiagnosticCategory? FailureCategory { get; set; }
        public string Failure { get; set; }
    }

    /// <summary>
    /// Laufzeitzustand einer BizTalk Host Instance.
    /// </summary>
    internal sealed class HostInstanceState
    {
        public string InstanceName { get; set; }
        public string HostName { get; set; }
        public string RunningServer { get; set; }
        public int ServiceState { get; set; }
    }

    /// <summary>
    /// Relevante Daten einer suspendierten BizTalk Service Instance.
    /// </summary>
    internal sealed class SuspendedInstance
    {
        public string ApplicationName { get; set; }
        public string ServiceName { get; set; }
        public string HostName { get; set; }
        public string ServiceClass { get; set; }
        public string InstanceId { get; set; }
        public string ErrorDescription { get; set; }
        public DateTime? SuspendTime { get; set; }
        public SuspendedKind Kind { get; set; }
    }

    /// <summary>
    /// Aggregierte Zustandszaehler einer BizTalk-Anwendung.
    /// </summary>
    internal sealed class ApplicationRuntimeState
    {
        public string ApplicationName { get; set; }
        public int ReceiveLocationTotal { get; set; }
        public int ReceiveLocationDisabled { get; set; }
        public int SendPortTotal { get; set; }
        public int SendPortStarted { get; set; }
        public int SendPortStopped { get; set; }
        public int SendPortBound { get; set; }
        public int SendPortUnknown { get; set; }
        public int OrchestrationTotal { get; set; }
        public int OrchestrationStarted { get; set; }
        public int OrchestrationStopped { get; set; }
        public int OrchestrationBound { get; set; }
        public int OrchestrationUnbound { get; set; }
        public int OrchestrationUnknown { get; set; }
    }

    /// <summary>
    /// Ergebnis der Auswertung des lokalen Windows Application Event Logs.
    /// </summary>
    internal sealed class EventLogState
    {
        public bool Available { get; set; }
        public int Errors { get; set; }
        public int Warnings { get; set; }
        public DateTime Since { get; set; }
        public string Failure { get; set; }
    }
}