using System;
using System.Linq;
using System.Numerics;
using System.Reflection;

namespace Cogwheel;

/// <summary>
/// Static class for interacting with the Cogwheel system
/// </summary>
public static class COGWHEEL
{
    private static CommandsManager _commandsManager;
    private static ICogwheelConsole _console;
    
    public static bool UseBuiltInCommands { get; set; } = true;

    /// <summary>
    /// Initializes the Cogwheel system
    /// </summary>
    /// <param name="commandsManager"></param>
    /// <param name="console"></param>
    public static void Initialize(CommandsManager commandsManager, ICogwheelConsole console)
    {
        _console = console;
        _commandsManager = commandsManager;
        
        InitializeCustomParsers();
        
        _commandsManager.Initialize(_console);
        _console.Initialize(_commandsManager);
    }
    
    // == Public static methods for the CommandsManager == //
    /// <summary>
    /// Runs a command
    /// </summary>
    /// <param name="input"></param>
    public static void RunCommand(string input)
    {
        _commandsManager.RunCommand(input);
    }
    
    /// <summary>
    /// Registers an object with the CommandsManager for non-static commands
    /// </summary>
    /// <param name="obj"></param>
    public static void RegisterObject(object obj)
    {
        _commandsManager.RegisterObject(obj);
    }
    
    
    // == Public static methods for the Console == //
    /// <summary>
    /// Logs a message to the console
    /// </summary>
    /// <param name="message"></param>
    public static void Log(string message)
    {
        _console.Log(message);
    }
    
    /// <summary>
    /// Logs an error message to the console
    /// </summary>
    /// <param name="message"></param>
    public static void LogError(string message)
    {
        _console.LogError(message);
    }
    
    /// <summary>
    /// Logs a warning message to the console
    /// </summary>
    /// <param name="message"></param>
    public static void LogWarning(string message)
    {
        _console.LogWarning(message);
    }
    
    /// <summary>
    /// Writes a message to the console
    /// </summary>
    /// <param name="message"></param>
    public static void Write(string message)
    {
        _console.Write(message);
    }
    
    /// <summary>
    /// Sets the context for the CommandsManager
    /// </summary>
    /// <param name="obj"></param>
    public static void SetContext(object obj)
    {
        _commandsManager.SetContext(obj);
    }
    
    /// <summary>
    /// Sets the context for the CommandsManager by GUID
    /// </summary>
    /// <param name="guid"></param>
    public static void SetContext(Guid guid)
    {
        _commandsManager.SetContext(guid);
    }
    
    /// <summary>
    /// Sets the context for the CommandsManager by GUID string
    /// </summary>
    /// <param name="guidString"></param>
    public static void SetContext(string guidString)
    {
        _commandsManager.SetContext(guidString);
    }
    
    // == Built-in commands == //
    /// <summary>
    /// Quit the Cogwheel console
    /// </summary>
    [Command(Name = "quit", Description = "Quits the Cogwheel console.")]
    public static void QuitCogwheelConsole()
    {
        _console.Exit();
    }
    
    /// <summary>
    /// Clears the console 
    /// </summary>
    [Command(Name = "clear", Description = "Clears the console.")]
    public static void ClearConsole()
    {
        _console.ClearConsole();
    }
    
    /// <summary>
    /// Shows the description and usage of a given command
    /// </summary>
    /// <param name="commandName"></param>
    [Command(Name = "help", Description = "Gets usage for given command.")]
    public static void ShowHelp(string commandName)
    {
        ICommand? command = _commandsManager.GetCommandByName(commandName);
        if (command is null)
        {
            _console.LogError($"Command error: '{commandName}' is not a command.");
            return;
        }

        _console.Log($"-- Command Usage For {commandName} --\n" +
                            $"Description: {command.Description}\n" +
                            $"Usage: {_commandsManager.GetCommandUsage(command)}");
    }
    
    /// <summary>
    /// Lists all available commands
    /// </summary>
    [Command(Name = "list", Description = "Lists all available commands.")]
    public static void ListCommands()
    {
        foreach (var command in _commandsManager.Commands)
        {
            Write($"{_commandsManager.GetCommandUsage(command.Value)}");
        }
    }
    
    /// <summary>
    /// Logs the current context type and GUID
    /// </summary>
    [Command(Name = "what", Description = "Prints the current context.")]
    public static void ShowCurrentContext()
    {
        if (_commandsManager.CurrentContext is null)
        {
            Log("No context set.");
            return;
        }
        
        _console.Log($"Current context: {_commandsManager.CurrentContext.GetType()} : {_commandsManager.CurrentContextGuid}");
    }
    
    /// <summary>
    /// Adds an assembly to the CommandsManager for command discovery
    /// </summary>
    /// <param name="assembly"></param>
    public static void AddAssembly(Assembly assembly)
    {
        _commandsManager.AddAssembly(assembly);
    }
    
    /// <summary>
    /// Removes an assembly from the CommandsManager
    /// </summary>
    /// <param name="assembly"></param>
    public static void RemoveAssembly(Assembly assembly)
    {
        _commandsManager.RemoveAssembly(assembly);
    }
    
    /// <summary>
    /// Adds a custom parser for a given type
    /// </summary>
    /// <param name="type"></param>
    /// <param name="parser"></param>
    public static void AddCustomParser(Type type, Func<string, object> parser)
    {
        _commandsManager.AddCustomParser(type, parser);
    }
    
    /// <summary>
    /// Logs all registered objects and their GUIDs, optionally filtered by type
    /// </summary>
    /// <param name="typeName"></param>
    [Command(Name = "find", Description = "Lists available registered objects to select from.")]
    private static void FindAllContextsFromRegisteredObjects(string typeName = "")
    {
        var registeredObjects = _commandsManager.RegisteredObjectInstances;
        var filteredObjects = string.IsNullOrEmpty(typeName)
            ? registeredObjects
            : registeredObjects.Where(kvp => kvp.Value.GetType().FullName == typeName).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

        if (!filteredObjects.Any())
        {
            LogError($"No registered objects found for type '{typeName}'");
            return;
        }

        Log("Available registered objects:");
        foreach (var (guid, obj) in filteredObjects)
        {
            Write($"- {obj.GetType().FullName} : {guid}");
        }
    }
    
    /// <summary>
    /// Sets the context to the specified registered object by GUID
    /// </summary>
    /// <param name="guidString"></param>
    [Command(Name = "set", Description = "Sets the context to the specified registered object.")]
    private static void SetContextFromGuid(string guidString)
    {
        SetContext(guidString);
        Log($"Set context to {_commandsManager.CurrentContext?.GetType().FullName} : {_commandsManager.CurrentContextGuid}");
    }

    /// <summary>
    /// Initializes custom parsers for the Cogwheel system
    /// </summary>
    /// <exception cref="FormatException"></exception>
    private static void InitializeCustomParsers()
    {
        // Add custom parser for Vector2
        _commandsManager.AddCustomParser(typeof(Vector2), s =>
        {
            s = s.Trim('(', ')');

            var parts = s.Split(',');
            if (parts.Length != 2)
            {
                throw new FormatException("Input string must have exactly three components separated by commas.");
            }

            if (!float.TryParse(parts[0].Trim(), out float x) ||
                !float.TryParse(parts[1].Trim(), out float y))
            {
                throw new FormatException("Input string contains invalid float values.");
            }

            return new Vector2(x, y);
        });
        
        // Add custom parser for Vector3
        _commandsManager.AddCustomParser(typeof(Vector3), s =>
        {
            s = s.Trim('(', ')');

            var parts = s.Split(',');
            if (parts.Length != 3)
            {
                throw new FormatException("Input string must have exactly three components separated by commas.");
            }

            if (!float.TryParse(parts[0].Trim(), out float x) ||
                !float.TryParse(parts[1].Trim(), out float y) ||
                !float.TryParse(parts[2].Trim(), out float z))
            {
                throw new FormatException("Input string contains invalid float values.");
            }

            return new Vector3(x, y, z);
        });
    }
}