using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        IList<TimePeriodItineraryRecord> records = new List<TimePeriodItineraryRecord>();

        var tpId = Guid.NewGuid();

        for(var i = 0; i < 3; i++) {

            records.Add(new TimePeriodItineraryRecord(tpId, "Trimestre 1", 0, Guid.NewGuid(), $"Step {i}", i, $"Style {i}"));

        }

        var tpLookup = records.GroupBy(r => new {r.TimePeriodId, r.TimePeriodTitle, r.TimePeriodOrder}, r => r);

        foreach(var tp in tpLookup) {

            Console.WriteLine("Lookup key: " + tp.Key);

            var steps = tp.Select(tp => new Step(tp.StepId, tp.StepTitle, tp.StyleName, tp.StepOrder)).OrderBy(s => s.Order);

            var itinerary = new TimePeriodItinerary(tp.Key.TimePeriodTitle, tp.Key.TimePeriodOrder, steps);

            Console.WriteLine("Itinerary: " + itinerary);

            Console.WriteLine("Steps: ");

            foreach(var step in steps) {

                Console.WriteLine(step);    

            }

        }

    }

    public record TimePeriodItineraryRecord(Guid TimePeriodId, string TimePeriodTitle, int TimePeriodOrder,

        Guid StepId, string StepTitle, int StepOrder, string StyleName);

    public record TimePeriodItinerary

    {

        public string TimePeriodTitle { get; }

        public int Order { get; }

        public IEnumerable<Step> Steps { get; }

​

        public TimePeriodItinerary(string timePeriodTitle, int order, IEnumerable<Step> steps)

        {

            TimePeriodTitle = timePeriodTitle;

            Order = order;

            Steps = steps;

        }

    }

    public record Step

    {

        public Guid StepId { get; }

        public string Title { get; }

        public string StyleName { get; }

        public int Order { get; }

​

        public Step(Guid stepId, string title, string styleName, int order)

        {

            StepId = stepId;

            Title = title;

            StyleName = styleName;

            Order = order;

        }

    }

}