///
/// Copyright (c) 2015-2021 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using log4net;
using TBF.Rig.Generic;
using UdsReaderType = TBF.Rig.Input.DataStorage.UniDataStorageReader.UniDataStorageReader;
using UdsWriterType = TBF.Rig.Output.DataStorage.UniDataStorageWriter.UniDataStorageWriter;

namespace TBF.Rig.BridgeComponents.GciBridge
{
    /// <summary>
    /// TBF bridge component for integration with the sibling GCI project.
    /// The component can be linked to UniDataStorage reader and writer components.
    /// </summary>
    public class GciBridge : ComponentBase
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(GciBridge));
        public override string ToString() { return string.Format("{0}({1})", ClassName, Cfg.ToString(-1)); }

        readonly GciBridgeCfg gciBridgeCfg;

        /// <summary>
        /// Linked UniDataStorage reader component.
        /// </summary>
        readonly UdsReaderType reader;

        /// <summary>
        /// Linked UniDataStorage writer component.
        /// </summary>
        readonly UdsWriterType writer;

        /// <summary>
        /// Placeholder for GCI GUI entry point.
        /// Replace object with real GCI MainForm type later.
        /// </summary>
        object gciMainForm;

        /// <summary>
        /// Placeholder for GCI external/public interface.
        /// Replace object with real GCI interface type later.
        /// </summary>
        object gciExternalInterface;

        public bool HasReader { get { return reader != null; } }
        public bool HasWriter { get { return writer != null; } }
        public bool IsGuiInitialized { get { return gciMainForm != null; } }
        public bool IsExternalInitialized { get { return gciExternalInterface != null; } }

        public GciBridge() { }

        public GciBridge(IComponentCfg cfg, IList<IComponent> components)
            : base(cfg)
        {
            gciBridgeCfg = cfg as GciBridgeCfg;
            if (gciBridgeCfg == null) throw new Exception("Invalid GciBridgeCfg.");

            if (!string.IsNullOrEmpty(gciBridgeCfg.ReaderName))
            {
                reader = TbfComponents.FindComponent(gciBridgeCfg.ReaderName, components) as UdsReaderType;
                if (reader == null) throw new Exception("Cannot find reader component '" + gciBridgeCfg.ReaderName + "'");
            }

            if (!string.IsNullOrEmpty(gciBridgeCfg.WriterName))
            {
                writer = TbfComponents.FindComponent(gciBridgeCfg.WriterName, components) as UdsWriterType;
                if (writer == null) throw new Exception("Cannot find writer component '" + gciBridgeCfg.WriterName + "'");
            }
        }

        public override void Initialize()
        {
            if (gciBridgeCfg.EnableExternalAccess)
            {
                TryInitializeExternalInterface();
            }

            if (gciBridgeCfg.EnableGuiAccess)
            {
                TryInitializeGui();

                if (gciBridgeCfg.ShowGuiOnInitialize)
                {
                    ShowGui();
                }
            }

            log.FatalFormat("{0} initialized: {1}", Name, this);
        }

        /// <summary>
        /// Initializes access to GCI GUI.
        /// Replace placeholder implementation with real MainForm creation.
        /// </summary>
        void TryInitializeGui()
        {
            try
            {
                /// TODO:
                /// Replace with real GCI MainForm initialization.
                gciMainForm = new object();

                log.InfoFormat("{0}: GCI GUI initialized.", Name);
            }
            catch (Exception ex)
            {
                log.Error("Failed to initialize GCI GUI.", ex);
            }
        }

        /// <summary>
        /// Initializes access to GCI external/public interface.
        /// Replace placeholder implementation with real interface creation.
        /// </summary>
        void TryInitializeExternalInterface()
        {
            try
            {
                /// TODO:
                /// Replace with real GCI external interface initialization.
                gciExternalInterface = new object();

                log.InfoFormat("{0}: GCI external interface initialized.", Name);
            }
            catch (Exception ex)
            {
                log.Error("Failed to initialize GCI external interface.", ex);
            }
        }

        /// <summary>
        /// Shows GCI GUI if GUI access is enabled.
        /// </summary>
        public void ShowGui()
        {
            if (!gciBridgeCfg.EnableGuiAccess) return;

            if (!IsGuiInitialized)
            {
                TryInitializeGui();
            }

            /// TODO:
            /// Replace with real MainForm.Show() call.
            log.InfoFormat("{0}: ShowGui invoked.", Name);
        }

        /// <summary>
        /// Hides GCI GUI if GUI access is enabled.
        /// </summary>
        public void HideGui()
        {
            if (!gciBridgeCfg.EnableGuiAccess) return;
            if (!IsGuiInitialized) return;

            /// TODO:
            /// Replace with real MainForm.Hide() call.
            log.InfoFormat("{0}: HideGui invoked.", Name);
        }

        /// <summary>
        /// Connects the external GCI interface.
        /// </summary>
        public void ConnectExternal()
        {
            if (!gciBridgeCfg.EnableExternalAccess) return;

            if (!IsExternalInitialized)
            {
                TryInitializeExternalInterface();
            }

            /// TODO:
            /// Replace with real external interface connect call.
            log.InfoFormat("{0}: ConnectExternal invoked.", Name);
        }

        /// <summary>
        /// Disconnects the external GCI interface.
        /// </summary>
        public void DisconnectExternal()
        {
            if (!gciBridgeCfg.EnableExternalAccess) return;
            if (!IsExternalInitialized) return;

            /// TODO:
            /// Replace with real external interface disconnect call.
            log.InfoFormat("{0}: DisconnectExternal invoked.", Name);
        }

        /// <summary>
        /// Returns linked reader component.
        /// </summary>
        public UdsReaderType GetReader()
        {
            return reader;
        }

        /// <summary>
        /// Returns linked writer component.
        /// </summary>
        public UdsWriterType GetWriter()
        {
            return writer;
        }
    }
}