TerrariaPluginTemplate/ConfigPlugin/ConfigPlugin.cs

using Terraria;
using TShockAPI;
using TerrariaApi.Server;
using TShockAPI.Hooks;

namespace ConfigPlugin
{
    [ApiVersion(2, 1)]
    public class ConfigPlugin(Main game) : TerrariaPlugin(game)
    {
        public override string Author => "wymiller";
        public override string Description => "A plugin that takes some configuration";
        public override string Name => "Configuration Plugin";
        public override Version Version => new Version(1, 0, 0, 0);
        
        // instantiate our config class
        public static readonly string ConfigPath = Path.Combine(TShock.SavePath, "Config.json");
        private Config? _config = new Config();

        public override void Initialize()
        {
            GeneralHooks.ReloadEvent += OnReload;
            ServerApi.Hooks.NetGreetPlayer.Register(this, OnJoin);
            
            PerformConfigOperations();
            
            Console.WriteLine("[ConfigPlugin] Plugin is loaded");
        }

        private void OnReload(ReloadEventArgs args)
        {
            PerformConfigOperations();
        }

        private void OnJoin(GreetPlayerEventArgs args)
        {
            TSPlayer player = TShock.Players[args.Who];
            player.SendInfoMessage($"{player} has arrived!");
            if (player.Name == _config?.Player)
            {
                player.SendInfoMessage(_config.CustomMessage);
            }
        }

        private void PerformConfigOperations()
        {
            if (File.Exists(ConfigPath))
            {
                _config = Config.Read();
            }
            else
            {
                _config?.Write();
            }
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                base.Dispose(disposing);
            }
        }
    }
}