Build a plugin that does useful work

using System;
using System.Threading.Tasks;
using System.Windows.Controls;
using DreamPoeBot.Loki.Bot;
using DreamPoeBot.Loki.Common;
using DreamPoeBot.Loki.Game;
using log4net;
using Message = DreamPoeBot.Loki.Bot.Message;

namespace DeveloperAcademy
{
    // IPlugin alone does not include Tick, Start or Stop. Opt in explicitly.
    public sealed class AcademyObserver : IPlugin, ITickEvents, IStartStopEvents
    {
        private static readonly ILog Log = Logger.GetLoggerInstanceForType();
        private readonly WaitTimer _interval = new WaitTimer(TimeSpan.FromSeconds(2));
        private UserControl _control;
        private bool _enabled;
        private uint? _lastAreaHash;
        private string _lastAreaId;

        public string Name => "AcademyObserver";
        public string Description => "A read-only first plugin: report the current area.";
        public string Author => "Your name";
        public string Version => "1.0.0";
        public JsonSettings Settings => null; // No persisted settings in this first lesson.
        public UserControl Control => _control ?? (_control = new UserControl
        {
            Content = new TextBlock
            {
                Text = "Enable this plugin, select AcademyBot, then press Start. Watch the log.",
                TextWrapping = System.Windows.TextWrapping.Wrap,
                Margin = new System.Windows.Thickness(12)
            }
        });

        public void Initialize() { }
        public void Deinitialize() { _enabled = false; }
        public void Enable()
        {
            _enabled = true;
            ResetArea();
            Log.Info("[AcademyObserver] Enabled. Waiting for a bot to call Tick.");
        }
        public void Disable() { _enabled = false; Log.Info("[AcademyObserver] Disabled."); }
        public void Start() { ResetArea(); _interval.Stop(); }
        public void Stop() { ResetArea(); }
        private void ResetArea() { _lastAreaHash = null; _lastAreaId = null; }

        #region ObserveArea
        public void Tick()
        {
            if (!_enabled) return;
            // Loading screens and character selection are normal, not errors.
            if (!LokiPoe.IsInGame || LokiPoe.Me == null)
            {
                ResetArea(); // Reacquire state when the player becomes available again.
                return;
            }
            if (!_interval.IsFinished) return;
            _interval.Reset();
            var area = LokiPoe.CurrentWorldArea;
            var hash = LokiPoe.LocalData.AreaHash;
            if (area == null || hash == 0 || (hash == _lastAreaHash && area.Id == _lastAreaId))
                return;

            // Name is a label. Hash identifies the instance; Id also distinguishes local zones.
            _lastAreaHash = hash;
            _lastAreaId = area.Id;
            Log.Info("[AcademyObserver] Area: " + area.Name + " (" + area.Id + ", instance " + hash + ")");
        }
        #endregion

        #region HandleMessage
        public MessageResult Message(Message message)
        {
            // This ID belongs to this sample, not to the DPB platform.
            if (message.Id != "academy.reset-observer")
                return MessageResult.Unprocessed;
            ResetArea();
            return MessageResult.Processed;
        }
        #endregion

        public Task<LogicResult> Logic(Logic logic) => Task.FromResult(LogicResult.Unprovided);
    }
}