using System;
using System.Reflection;

public class Program
{
    static void Main(string[] args)
    {

        // setup db and logger using funcs

        // use default

        contextfuncs.db = contextfuncs.default_database;

        // set verbose to true to demonstrate
        
        // explicit logging with method names and results

        contextfuncs.logger = new Func<logger>(() => new logger { verbose = true });

        // pipe the commands

        // use expressive naming

        // but avoid keeping each result in a separate var

        "Give me a product id please"

        .IntoExpr(command_line_operations.ask_user_for_integer)

        .IntoExpr(query_the_database.products.with_id)

        .IntoExpr(format_strings.product_formatted_for_commandline)

        .IntoExpr(command_line_operations.write_message_to_user_and_wait_for_enter);

    }
}

public static class contextfuncs
{
    public static Func<database> default_database = new Func<database>(() => new database());
    public static Func<logger> default_logger = new Func<logger>(() => new logger());

    public static Func<database> db { get; set; }
    public static Func<logger> logger { get; set; }
}
public class database { }
public class logger
{
    public bool verbose { get; set; }
    public void log(bool isverbose, Func<string> logmessageFunc)
    {
        if (isverbose == verbose || !isverbose)
        {
            var logmessage = logmessageFunc();

            var color = Console.ForegroundColor;
            Console.ForegroundColor = ConsoleColor.DarkCyan;
            Console.WriteLine(DateTime.Now.ToLongTimeString() + "> " + logmessage);
            Console.ForegroundColor = color;
        }
    }
}
public class context
{
    public database database { get; set; }
    public logger logger { get; set; }
}
public static class command_line_operations
{

    public static int ask_user_for_integer(string ask_user)
    {
        Console.WriteLine(ask_user);
        var input = Console.ReadLine();
        return Int32.Parse(input);
    }
    public static void wait_for_enter()
    {
        Console.ReadLine();
    }
    public static string write_message_to_user_and_wait_for_enter(format_strings.string_formatted_for_commandline message)
    {
        Console.WriteLine(message);
        return Console.ReadLine();
    }

}
public static class format_strings
{
    public class string_formatted_for_commandline
    {
        public string message { get; set; }
        public override string ToString()
        {
            return message.ToString();
        }
        public string_formatted_for_commandline(string message)
        {
            this.message = message;
        }
    }
    public static string_formatted_for_commandline product_formatted_for_commandline(Product p)
    {
        return new string_formatted_for_commandline(String.Format("Product name: '{0}' Id: {1}", p.Name, p.Id));
    }
}

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
}


public static class query_the_database
{

    public static void assert_the_database_is_available()
    {
        if (contextfuncs.db == null || contextfuncs.db() == null) throw new Exception("Db error");
    }

    public static class products
    {
        public static Product with_id(int id)
        {
            assert_the_database_is_available();

            return new Product { Id = id, Name = "Some name" };

        }

    }


}

public static class IntoExtensions
{
    public delegate TOut MethodDelegate<TIn, TOut>(TIn obj);
    public delegate void MethodDelegate<TIn>(TIn obj);
    public delegate void MethodDelegate();

    public static string method_info(MethodInfo methodInfo)
    {
        return methodInfo.DeclaringType.FullName + "." + methodInfo.Name;
    }
    public static TOut IntoExpr<TIn, TOut>(this TIn obj, MethodDelegate<TIn, TOut> del)
    {
        var result = del(obj);

        contextfuncs.logger().log(true, () => String.Format("{0}({1}): {2}", method_info(del.Method), obj.ToString(), result.ToString()));

        return result;
    }

    public static void IntoExpr<TIn>(this TIn obj, MethodDelegate<TIn> del)
    {
        del(obj);
        contextfuncs.logger().log(true, () => String.Format("{0}({1}): void", method_info(del.Method), obj.ToString()));
    }
    public static void IntoExpr<TIn>(this TIn obj, MethodDelegate del)
    {
        del();
        contextfuncs.logger().log(true, () => String.Format("{0}(): void", method_info(del.Method)));
    }

    public static TOut Into<TIn, TOut>(this TIn obj, Func<TIn, TOut> f)
    { return f(obj); }

    public static T Passthrough<T>(this T obj)
    {
        return obj;
    }
    public static T PassthroughAssert<T>(this T obj, bool condition)
    {
        if (condition) return obj;
        throw new Exception("Condition not met");
    }

    public static void Into<TIn>(this TIn obj, Action<TIn> f)
    { f(obj); }

}