using System;
using System.Collections.Generic;
using ZB.MOM.WW.OtOpcUa.Host.Domain;
using ZB.MOM.WW.OtOpcUa.Host.Metrics;

namespace ZB.MOM.WW.OtOpcUa.Host.Status
{
    /// <summary>
    ///     DTO containing all dashboard data. (DASH-001 through DASH-009)
    /// </summary>
    public class StatusData
    {
        /// <summary>
        ///     Gets or sets the current MXAccess and service connectivity summary shown on the dashboard.
        /// </summary>
        public ConnectionInfo Connection { get; set; } = new();

        /// <summary>
        ///     Gets or sets the overall health state communicated to operators.
        /// </summary>
        public HealthInfo Health { get; set; } = new();

        /// <summary>
        ///     Gets or sets subscription counts that show how many live tag streams the bridge is maintaining.
        /// </summary>
        public SubscriptionInfo Subscriptions { get; set; } = new();

        /// <summary>
        ///     Gets or sets Galaxy-specific metadata such as deploy timing and address-space counts.
        /// </summary>
        public GalaxyInfo Galaxy { get; set; } = new();

        /// <summary>
        ///     Gets or sets MXAccess data change dispatch queue metrics.
        /// </summary>
        public DataChangeInfo DataChange { get; set; } = new();

        /// <summary>
        ///     Gets or sets per-operation performance statistics used to diagnose bridge throughput and latency.
        /// </summary>
        public Dictionary<string, MetricsStatistics> Operations { get; set; } = new();

        /// <summary>
        ///     Gets or sets the historian integration status (plugin load outcome, server target).
        /// </summary>
        public HistorianStatusInfo Historian { get; set; } = new();

        /// <summary>
        ///     Gets or sets the alarm integration status and event counters.
        /// </summary>
        public AlarmStatusInfo Alarms { get; set; } = new();

        /// <summary>
        ///     Gets or sets the redundancy state when redundancy is enabled.
        /// </summary>
        public RedundancyInfo? Redundancy { get; set; }

        /// <summary>
        ///     Gets or sets the listening OPC UA endpoints and active security profiles.
        /// </summary>
        public EndpointsInfo Endpoints { get; set; } = new();

        /// <summary>
        ///     Gets or sets the Galaxy runtime host state (Platforms + AppEngines).
        /// </summary>
        public RuntimeStatusInfo RuntimeStatus { get; set; } = new();

        /// <summary>
        ///     Gets or sets footer details such as the snapshot timestamp and service version.
        /// </summary>
        public FooterInfo Footer { get; set; } = new();
    }

    /// <summary>
    ///     Dashboard model summarizing per-host Galaxy runtime state.
    /// </summary>
    public class RuntimeStatusInfo
    {
        /// <summary>
        ///     Gets or sets the total number of tracked runtime hosts ($WinPlatform + $AppEngine).
        /// </summary>
        public int Total { get; set; }

        /// <summary>
        ///     Gets or sets the count of hosts currently reported Running.
        /// </summary>
        public int RunningCount { get; set; }

        /// <summary>
        ///     Gets or sets the count of hosts currently reported Stopped.
        /// </summary>
        public int StoppedCount { get; set; }

        /// <summary>
        ///     Gets or sets the count of hosts whose state is still Unknown (either awaiting initial
        ///     probe resolution or transported-through-disconnected).
        /// </summary>
        public int UnknownCount { get; set; }

        /// <summary>
        ///     Gets or sets the per-host state in stable alphabetical order.
        /// </summary>
        public List<GalaxyRuntimeStatus> Hosts { get; set; } = new();
    }

    /// <summary>
    ///     Dashboard model describing the OPC UA server's listening endpoints and active security profiles.
    /// </summary>
    public class EndpointsInfo
    {
        /// <summary>
        ///     Gets or sets the list of opc.tcp base addresses the server is listening on.
        /// </summary>
        public List<string> BaseAddresses { get; set; } = new();

        /// <summary>
        ///     Gets or sets the list of configured user token policies (Anonymous, UserName, Certificate).
        /// </summary>
        public List<string> UserTokenPolicies { get; set; } = new();

        /// <summary>
        ///     Gets or sets the active security profiles reported to clients.
        /// </summary>
        public List<SecurityProfileInfo> SecurityProfiles { get; set; } = new();
    }

    /// <summary>
    ///     Dashboard model for a single configured OPC UA server security profile.
    /// </summary>
    public class SecurityProfileInfo
    {
        /// <summary>
        ///     Gets or sets the OPC UA security policy URI (e.g., http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256).
        /// </summary>
        public string PolicyUri { get; set; } = "";

        /// <summary>
        ///     Gets or sets the short policy name extracted from the policy URI.
        /// </summary>
        public string PolicyName { get; set; } = "";

        /// <summary>
        ///     Gets or sets the message security mode (None, Sign, SignAndEncrypt).
        /// </summary>
        public string SecurityMode { get; set; } = "";
    }

    /// <summary>
    ///     Dashboard model for current runtime connection details.
    /// </summary>
    public class ConnectionInfo
    {
        /// <summary>
        ///     Gets or sets the current MXAccess connection state shown to operators.
        /// </summary>
        public string State { get; set; } = "Disconnected";

        /// <summary>
        ///     Gets or sets how many reconnect attempts have occurred since the service started.
        /// </summary>
        public int ReconnectCount { get; set; }

        /// <summary>
        ///     Gets or sets the number of active OPC UA sessions connected to the bridge.
        /// </summary>
        public int ActiveSessions { get; set; }
    }

    /// <summary>
    ///     Dashboard model for the overall health banner.
    /// </summary>
    public class HealthInfo
    {
        /// <summary>
        ///     Gets or sets the high-level health state, such as Healthy, Degraded, or Unhealthy.
        /// </summary>
        public string Status { get; set; } = "Unknown";

        /// <summary>
        ///     Gets or sets the operator-facing explanation for the current health state.
        /// </summary>
        public string Message { get; set; } = "";

        /// <summary>
        ///     Gets or sets the color token used by the dashboard UI to render the health banner.
        /// </summary>
        public string Color { get; set; } = "gray";
    }

    /// <summary>
    ///     Dashboard model for subscription load.
    /// </summary>
    public class SubscriptionInfo
    {
        /// <summary>
        ///     Gets or sets the number of active tag subscriptions mirrored from MXAccess into OPC UA.
        ///     This total includes bridge-owned runtime status probes; see <see cref="ProbeCount"/> for the
        ///     subset attributable to probes.
        /// </summary>
        public int ActiveCount { get; set; }

        /// <summary>
        ///     Gets or sets the count of bridge-owned runtime status probes included in
        ///     <see cref="ActiveCount"/>. Surfaced on the dashboard so operators can distinguish probe
        ///     overhead from client-driven subscription load.
        /// </summary>
        public int ProbeCount { get; set; }
    }

    /// <summary>
    ///     Dashboard model for Galaxy metadata and rebuild status.
    /// </summary>
    public class GalaxyInfo
    {
        /// <summary>
        ///     Gets or sets the Galaxy name currently being bridged into OPC UA.
        /// </summary>
        public string GalaxyName { get; set; } = "";

        /// <summary>
        ///     Gets or sets a value indicating whether the repository database is currently reachable.
        /// </summary>
        public bool DbConnected { get; set; }

        /// <summary>
        ///     Gets or sets the most recent deploy timestamp observed in the Galaxy repository.
        /// </summary>
        public DateTime? LastDeployTime { get; set; }

        /// <summary>
        ///     Gets or sets the number of Galaxy objects currently represented in the address space.
        /// </summary>
        public int ObjectCount { get; set; }

        /// <summary>
        ///     Gets or sets the number of Galaxy attributes currently represented as OPC UA variables.
        /// </summary>
        public int AttributeCount { get; set; }

        /// <summary>
        ///     Gets or sets the UTC timestamp of the last completed address-space rebuild.
        /// </summary>
        public DateTime? LastRebuildTime { get; set; }
    }

    /// <summary>
    ///     Dashboard model for MXAccess data change dispatch metrics.
    /// </summary>
    public class DataChangeInfo
    {
        /// <summary>
        ///     Gets or sets the rate of MXAccess data change events received per second.
        /// </summary>
        public double EventsPerSecond { get; set; }

        /// <summary>
        ///     Gets or sets the average number of items processed per dispatch cycle.
        /// </summary>
        public double AvgBatchSize { get; set; }

        /// <summary>
        ///     Gets or sets the number of items currently waiting in the dispatch queue.
        /// </summary>
        public int PendingItems { get; set; }

        /// <summary>
        ///     Gets or sets the total MXAccess data change events received since startup.
        /// </summary>
        public long TotalEvents { get; set; }
    }

    /// <summary>
    ///     Dashboard model for the Wonderware historian integration (runtime-loaded plugin).
    /// </summary>
    public class HistorianStatusInfo
    {
        /// <summary>
        ///     Gets or sets a value indicating whether historian support is enabled in configuration.
        /// </summary>
        public bool Enabled { get; set; }

        /// <summary>
        ///     Gets or sets the most recent plugin load outcome as a string.
        ///     Values: <c>Disabled</c>, <c>NotFound</c>, <c>LoadFailed</c>, <c>Loaded</c>.
        /// </summary>
        public string PluginStatus { get; set; } = "Disabled";

        /// <summary>
        ///     Gets or sets the error message from the last load attempt when <see cref="PluginStatus"/> is <c>LoadFailed</c>.
        /// </summary>
        public string? PluginError { get; set; }

        /// <summary>
        ///     Gets or sets the absolute path the loader probed for the plugin assembly.
        /// </summary>
        public string PluginPath { get; set; } = "";

        /// <summary>
        ///     Gets or sets the configured historian server hostname.
        /// </summary>
        public string ServerName { get; set; } = "";

        /// <summary>
        ///     Gets or sets the configured historian TCP port.
        /// </summary>
        public int Port { get; set; }

        /// <summary>
        ///     Gets or sets the total number of historian read queries attempted since startup.
        /// </summary>
        public long QueryTotal { get; set; }

        /// <summary>
        ///     Gets or sets the number of historian queries that completed without an exception.
        /// </summary>
        public long QuerySuccesses { get; set; }

        /// <summary>
        ///     Gets or sets the number of historian queries that raised an exception.
        /// </summary>
        public long QueryFailures { get; set; }

        /// <summary>
        ///     Gets or sets the number of consecutive failures since the last successful query.
        /// </summary>
        public int ConsecutiveFailures { get; set; }

        /// <summary>
        ///     Gets or sets the UTC timestamp of the last successful query.
        /// </summary>
        public DateTime? LastSuccessTime { get; set; }

        /// <summary>
        ///     Gets or sets the UTC timestamp of the last query failure.
        /// </summary>
        public DateTime? LastFailureTime { get; set; }

        /// <summary>
        ///     Gets or sets the exception message from the most recent failure.
        /// </summary>
        public string? LastQueryError { get; set; }

        /// <summary>
        ///     Gets or sets a value indicating whether the plugin currently holds an open process-path
        ///     SDK connection.
        /// </summary>
        public bool ProcessConnectionOpen { get; set; }

        /// <summary>
        ///     Gets or sets a value indicating whether the plugin currently holds an open event-path
        ///     SDK connection.
        /// </summary>
        public bool EventConnectionOpen { get; set; }

        /// <summary>
        ///     Gets or sets the total number of configured historian cluster nodes.
        /// </summary>
        public int NodeCount { get; set; }

        /// <summary>
        ///     Gets or sets the number of cluster nodes currently eligible for new connections
        ///     (i.e., not in failure cooldown).
        /// </summary>
        public int HealthyNodeCount { get; set; }

        /// <summary>
        ///     Gets or sets the node currently serving process (historical value) queries, or null
        ///     when no process connection is open.
        /// </summary>
        public string? ActiveProcessNode { get; set; }

        /// <summary>
        ///     Gets or sets the node currently serving event (alarm history) queries, or null when
        ///     no event connection is open.
        /// </summary>
        public string? ActiveEventNode { get; set; }

        /// <summary>
        ///     Gets or sets the per-node cluster state in configuration order.
        /// </summary>
        public List<Historian.HistorianClusterNodeState> Nodes { get; set; } = new();
    }

    /// <summary>
    ///     Dashboard model for alarm integration health and event counters.
    /// </summary>
    public class AlarmStatusInfo
    {
        /// <summary>
        ///     Gets or sets a value indicating whether alarm condition tracking is enabled in configuration.
        /// </summary>
        public bool TrackingEnabled { get; set; }

        /// <summary>
        ///     Gets or sets the number of distinct alarm conditions currently tracked.
        /// </summary>
        public int ConditionCount { get; set; }

        /// <summary>
        ///     Gets or sets the number of alarms currently in the InAlarm=true state.
        /// </summary>
        public int ActiveAlarmCount { get; set; }

        /// <summary>
        ///     Gets or sets the total number of InAlarm transitions observed since startup.
        /// </summary>
        public long TransitionCount { get; set; }

        /// <summary>
        ///     Gets or sets the total number of alarm acknowledgement transitions observed since startup.
        /// </summary>
        public long AckEventCount { get; set; }

        /// <summary>
        ///     Gets or sets the total number of alarm acknowledgement MXAccess writes that have failed since startup.
        /// </summary>
        public long AckWriteFailures { get; set; }

        /// <summary>
        ///     Gets or sets a value indicating whether the template-based alarm object filter is active.
        /// </summary>
        public bool FilterEnabled { get; set; }

        /// <summary>
        ///     Gets or sets the number of compiled alarm filter patterns.
        /// </summary>
        public int FilterPatternCount { get; set; }

        /// <summary>
        ///     Gets or sets the number of Galaxy objects included by the alarm filter during the most recent build.
        /// </summary>
        public int FilterIncludedObjectCount { get; set; }

        /// <summary>
        ///     Gets or sets the raw alarm filter patterns exactly as configured, for dashboard display.
        /// </summary>
        public List<string> FilterPatterns { get; set; } = new();
    }

    /// <summary>
    ///     Dashboard model for redundancy state. Only populated when redundancy is enabled.
    /// </summary>
    public class RedundancyInfo
    {
        /// <summary>
        ///     Gets or sets whether redundancy is enabled.
        /// </summary>
        public bool Enabled { get; set; }

        /// <summary>
        ///     Gets or sets the redundancy mode (e.g., "Warm", "Hot").
        /// </summary>
        public string Mode { get; set; } = "";

        /// <summary>
        ///     Gets or sets this instance's role ("Primary" or "Secondary").
        /// </summary>
        public string Role { get; set; } = "";

        /// <summary>
        ///     Gets or sets the current ServiceLevel byte.
        /// </summary>
        public byte ServiceLevel { get; set; }

        /// <summary>
        ///     Gets or sets this instance's ApplicationUri.
        /// </summary>
        public string ApplicationUri { get; set; } = "";

        /// <summary>
        ///     Gets or sets the list of all server URIs in the redundant set.
        /// </summary>
        public List<string> ServerUris { get; set; } = new();
    }

    /// <summary>
    ///     DTO for the /api/health endpoint. Includes component-level health, ServiceLevel, and redundancy state.
    /// </summary>
    public class HealthEndpointData
    {
        /// <summary>
        ///     Gets or sets the overall health status: Healthy, Degraded, or Unhealthy.
        /// </summary>
        public string Status { get; set; } = "Unknown";

        /// <summary>
        ///     Gets or sets the computed OPC UA ServiceLevel byte (0-255). Only meaningful when redundancy is enabled.
        /// </summary>
        public byte ServiceLevel { get; set; }

        /// <summary>
        ///     Gets or sets whether redundancy is enabled.
        /// </summary>
        public bool RedundancyEnabled { get; set; }

        /// <summary>
        ///     Gets or sets this instance's redundancy role when enabled (Primary/Secondary), or null when disabled.
        /// </summary>
        public string? RedundancyRole { get; set; }

        /// <summary>
        ///     Gets or sets the redundancy mode when enabled (Warm/Hot), or null when disabled.
        /// </summary>
        public string? RedundancyMode { get; set; }

        /// <summary>
        ///     Gets or sets the per-component health breakdown.
        /// </summary>
        public ComponentHealth Components { get; set; } = new();

        /// <summary>
        ///     Gets or sets the server uptime since the health endpoint was initialized.
        /// </summary>
        public string Uptime { get; set; } = "";

        /// <summary>
        ///     Gets or sets the UTC timestamp of this health snapshot.
        /// </summary>
        public DateTime Timestamp { get; set; } = DateTime.UtcNow;
    }

    /// <summary>
    ///     Per-component health breakdown for the health endpoint.
    /// </summary>
    public class ComponentHealth
    {
        /// <summary>
        ///     Gets or sets MXAccess runtime connectivity status.
        /// </summary>
        public string MxAccess { get; set; } = "Disconnected";

        /// <summary>
        ///     Gets or sets Galaxy repository database connectivity status.
        /// </summary>
        public string Database { get; set; } = "Disconnected";

        /// <summary>
        ///     Gets or sets OPC UA server status.
        /// </summary>
        public string OpcUaServer { get; set; } = "Stopped";

        /// <summary>
        ///     Gets or sets the historian plugin status.
        ///     Values: <c>Disabled</c>, <c>NotFound</c>, <c>LoadFailed</c>, <c>Loaded</c>.
        /// </summary>
        public string Historian { get; set; } = "Disabled";

        /// <summary>
        ///     Gets or sets whether alarm condition tracking is enabled.
        ///     Values: <c>Disabled</c>, <c>Enabled</c>.
        /// </summary>
        public string Alarms { get; set; } = "Disabled";
    }

    /// <summary>
    ///     Dashboard model for the status page footer.
    /// </summary>
    public class FooterInfo
    {
        /// <summary>
        ///     Gets or sets the UTC time when the status snapshot was generated.
        /// </summary>
        public DateTime Timestamp { get; set; } = DateTime.UtcNow;

        /// <summary>
        ///     Gets or sets the service version displayed to operators for support and traceability.
        /// </summary>
        public string Version { get; set; } = "";
    }
}