using System;
using System.Reflection;

namespace Game;

internal struct ConsoleCommand
{
    public string name { get; }

    private readonly MethodInfo[] methods;

    public ConsoleCommand(string name, MethodInfo[] method)
    {
        this.name = name;
        methods = method;
    }

    public void Invoke()
    {
        foreach (MethodInfo method in methods)
        {
            var methodParameters = method.GetParameters();
            if (methodParameters.Length == 0)
                method.Invoke(null, null);
            else if (methodParameters.Length == 1 && methodParameters[0].ParameterType == typeof(string[]))
                method.Invoke(null, new object[] { Array.Empty<string>() });
            else
                continue;
            return;
        }

        throw new Exception("Unexpected number of parameters.");
    }

    public void Invoke(string[] parameters)
    {
        MethodInfo match = null;
        foreach (MethodInfo method in methods)
        {
            var methodParameters = method.GetParameters();
            if (methodParameters.Length == 1 && methodParameters[0].ParameterType == typeof(string[]))
            {
                match = method;
                continue;
            }

            if (methodParameters.Length != parameters.Length)
                continue;

            // TODO: try to parse string parameters to needed types first,
            // may require finding the exact match first instead of first matching one.
            for (int i = 0; i < methodParameters.Length; i++)
                //if (methodParameters[i].ParameterType != parameters[i].GetType())
                if (methodParameters[i].ParameterType != typeof(string))
                    continue;

            if (match != null)
                // Prefer exact number of parameters over string[] match
                if (methodParameters.Length != parameters.Length)
                    continue;

            match = method;
        }

        if (match != null)
        {
            if (match.GetParameters().Length == 1 && match.GetParameters()[0].ParameterType == typeof(string[]))
                match.Invoke(null, new object[] { parameters });
            else
                match.Invoke(null, parameters);

            return;
        }

        throw new Exception("Unexpected number of parameters.");
    }
}