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Runtime/Engine/Code/Services/Console/ConsoleService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using RebootKit.Engine.Foundation;
+using RebootKit.Engine.Services.Input;
+using UnityEngine.InputSystem;
+using Logger = RebootKit.Engine.Foundation.Logger;
+
+namespace RebootKit.Engine.Services.Console {
+    public interface IConsoleCommand {
+        string Name { get; }
+        string Description { get; }
+        void Execute(string[] args);
+    }
+
+    public class HelpCommand : IConsoleCommand {
+        public string Name { get; } = "help";
+        public string Description { get; } = "Prints available commands/cvars and their descriptions.";
+
+        public void Execute(string[] args) {
+            RR.Console().PrintHelp();
+        }
+    }
+
+    public class ConsoleService : IService {
+        private static readonly Logger _logger = new(nameof(ConsoleService));
+
+        [Serializable]
+        public class Config {
+            public ConsoleUI ConsoleUIPrefab;
+            public ScriptableInputAction ToggleAction;
+        }
+
+        private ConsoleUI _ui;
+        private Config _config;
+
+        private List<IConsoleCommand> _commands = new();
+        private List<CVar> _cvars = new();
+
+        public bool IsVisible => _ui.IsVisible;
+
+        public ConsoleService(Config config) {
+            _config = config;
+        }
+
+        public async UniTask OnInit(CancellationToken cancellationToken) {
+            _logger.Info("Waking up");
+
+            _ui = UnityEngine.Object.Instantiate(_config.ConsoleUIPrefab);
+            UnityEngine.Object.DontDestroyOnLoad(_ui.gameObject);
+            await UniTask.Yield(cancellationToken);
+
+            _config.ToggleAction.Action.Enable();
+            _config.ToggleAction.Action.performed += OnToggleAction;
+
+            RegisterCommand(new HelpCommand());
+
+            _ui.SetVisibility(false);
+            _ui.Clear();
+            _ui.Write("Hello shelf\n");
+        }
+        
+        public void Dispose() {
+            if (_ui != null) {
+                UnityEngine.Object.Destroy(_ui);
+                _ui = null;
+            }
+            
+            _config.ToggleAction.Action.performed -= OnToggleAction;
+        }
+
+        public CVar GetCVar(string name) {
+            foreach (CVar cvar in _cvars) {
+                if (cvar.Name.Equals(name)) {
+                    return cvar;
+                }
+            }
+
+            return null;
+        }
+
+        public CVar ReplaceOrDefault(CVar cvar) {
+            CVar foundCVar = GetCVar(cvar.Name);
+            if (foundCVar != null) {
+                return foundCVar;
+            }
+
+            _cvars.Add(cvar);
+            return cvar;
+        }
+
+        public void Replace(CVar cvar) {
+            CVar foundCVar = GetCVar(cvar.Name);
+            if (foundCVar != null) {
+                _cvars.Remove(foundCVar);
+            }
+
+            _cvars.Add(cvar);
+        }
+
+        private string[] ParseCommandInputArguments(string text) {
+            if (text.Length == 0) {
+                return Array.Empty<string>();
+            }
+
+            return new string[] {text};
+        }
+
+        public void Execute(string input) {
+            if (input.Length == 0) {
+                return;
+            }
+
+            string commandName = input;
+            if (input.IndexOf(' ') != -1) {
+                commandName = input.Substring(0, input.IndexOf(' '));
+            }
+
+            string[] arguments = ParseCommandInputArguments(input.Substring(commandName.Length));
+
+            foreach (IConsoleCommand command in _commands) {
+                if (command.Name.Equals(commandName)) {
+                    command.Execute(arguments);
+                    return;
+                }
+            }
+
+            foreach (CVar cvar in _cvars) {
+                if (cvar.Name.Equals(commandName)) {
+                    if (arguments.Length == 1) {
+                        cvar.ParseFromString(arguments[0]);
+                    }
+
+                    _ui.Write($"<b>{cvar.Name}</b> - {cvar.ToString()}\n");
+                    return;
+                }
+            }
+
+            _ui.Write($"ERROR: Command/CVar `{commandName}` not found.");
+        }
+
+        public void ToggleVisibility() {
+            _ui.SetVisibility(!_ui.IsVisible);
+
+            if (_ui.IsVisible) {
+                // RR.Input().DisableControls();
+            } else {
+                RR.Input().EnableControls();
+            }
+        }
+
+        public void RegisterCommand(IConsoleCommand command) {
+            if (_commands.Any(t => t.Name.Equals(command.Name))) {
+                _logger.Error($"`{command.Name}` command is already registered");
+                return;
+            }
+
+            _commands.Add(command);
+            _logger.Info($"Registered command: {command.Name}");
+        }
+
+        public void PrintHelp() {
+            StringBuilder message = new();
+
+            message.AppendLine("Available commands:");
+            foreach (IConsoleCommand command in _commands) {
+                message.Append("    ");
+                message.Append(command.Name);
+                message.Append(" - ");
+                message.Append(command.Description);
+                message.AppendLine();
+            }
+
+            message.AppendLine("Available cvars:");
+            foreach (CVar cvar in _cvars) {
+                message.Append("    ");
+                message.Append(cvar.Name);
+                message.Append(" - ");
+                message.Append(cvar.Description);
+                message.AppendLine();
+            }
+
+            _ui.Write(message.ToString());
+        }
+
+        private void OnToggleAction(InputAction.CallbackContext obj) {
+            ToggleVisibility();
+        }
+    }
+}