using System.Linq.Expressions;
using System.Reflection;


namespace ServerBase;

public static class MethodInfoExtentions
{
    public static TDelegate compile<TDelegate>(MethodInfo mi)
    {
        ParameterExpression? @this = null;
        if (!mi.IsStatic)
        {
            @this = Expression.Parameter(mi.DeclaringType!, "this");
        }

        var parameters = new List<ParameterExpression>();
        if (@this != null)
        {
            parameters.Add(@this);
        }

        foreach (var parameter in mi.GetParameters())
        {
            parameters.Add(Expression.Parameter(parameter.ParameterType, parameter.Name));
        }

        Expression? call = null;
        if (@this != null)
        {
            call = Expression.Call(@this, mi, parameters.Skip(1));
        }
        else
        {
            call = Expression.Call(mi, parameters);
        }

        return Expression.Lambda<TDelegate>(call, parameters).Compile();
    }
}