using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var partRoutings = BuildPartRoutings();

        foreach (var pr in partRoutings)

        {

            Console.WriteLine(pr);

        }

    }

    public static List<PartRouting> BuildPartRoutings()

    {

        var partRoutings = new List<PartRouting>();

        //partRoutings.AddRange(BuildPartRoutingsAllNA());

        partRoutings.AddRange(BuildPartRoutingsBuildVNStockNA());

        return partRoutings;

    }

    public static List<PartRouting> BuildPartRoutingsAllNA()

    {

        var partRoutings = new List<PartRouting>();

        partRoutings.Add(new PartRouting(Facilities.NA, Facilities.NA, Facilities.NA, true, FulfilledBy.PullFromStock));

        partRoutings.Add(new PartRouting(Facilities.NA, Facilities.NA, Facilities.NA, true, FulfilledBy.Build));

        partRoutings.Add(new PartRouting(Facilities.NA, Facilities.NA, Facilities.NA, false, FulfilledBy.PullFromStock));

        partRoutings.Add(new PartRouting(Facilities.NA, Facilities.NA, Facilities.NA, false, FulfilledBy.Build));

        return partRoutings;

    }

    public static List<PartRouting> BuildPartRoutingsBuildVNStockNA()

    {

        var partRoutings = new List<PartRouting>();

        partRoutings.Add(new PartRouting(Facilities.VN, Facilities.NA, Facilities.NA, true, FulfilledBy.PullFromStock));

        partRoutings.Add(new PartRouting(Facilities.VN, Facilities.NA, Facilities.NA, true, FulfilledBy.Build));

        partRoutings.Add(new PartRouting(Facilities.VN, Facilities.NA, Facilities.NA, false, FulfilledBy.PullFromStock));

        partRoutings.Add(new PartRouting(Facilities.VN, Facilities.NA, Facilities.NA, false, FulfilledBy.Build));

        return partRoutings;

    }

}

​

public enum FulfilledBy

{

    PullFromStock,

    Build

}

​

​

public enum FacilityType

{

    Mfg,

    Stock,

    Ship

}

​

public static class Facilities

{

    public static string NA => "NA";

    public static string VN => "VN";

    public static string HZ => "HZ";

}

​

public class FacilitySelection

{

    public FacilityType FacilityType { get; set; }

    public string Name { get; set; }

    public FacilitySelection(FacilityType type, string name)

    {

        this.FacilityType = type;

        this.Name = name;

    }

    public override string ToString()

    {

        return $"{FacilityType}: {Name}";

    }

}

​

public static class Extensions

{

    public static string Dump(this IEnumerable<FacilitySelection> facilities, string delimiter = ",")

    {

        string result = string.Join($"{delimiter} ", facilities.Select(x => x.ToString()));

        return result;

    }

}

​

public class PartRouting

{

    public bool IsStocked { get; set; }

    public FulfilledBy FulfilledBy { get; set; }

    public FacilitySelection MfgFacility { get; set; }

    public FacilitySelection StockFacility { get; set; }

    public FacilitySelection ShipFacility { get; set; }

    public PartRouting(string mfgFacility, string stockFacility, string shipFacility, bool isStocked, FulfilledBy pullFromStock)

    {

        this.MfgFacility = new FacilitySelection(FacilityType.Mfg, mfgFacility);

        this.StockFacility = new FacilitySelection(FacilityType.Stock, stockFacility);

        this.ShipFacility = new FacilitySelection(FacilityType.Ship, shipFacility);

        this.IsStocked = isStocked;

    }

    public List<FacilitySelection> GetTransitChain()

    {

        var facilities = new List<FacilitySelection>();

        facilities.Add(FulfilledBy == FulfilledBy.Build ? MfgFacility : StockFacility);

        if (IsStocked && FulfilledBy == FulfilledBy.Build && StockFacility.Name != MfgFacility.Name) { facilities.Add(StockFacility); }

        if (ShipFacility.Name != facilities.LastOrDefault()?.Name) { facilities.Add(ShipFacility); }

        return facilities;

    }

    public override string ToString()

    {

        var facilities = new List<FacilitySelection>();

        if (MfgFacility != null) { facilities.Add(MfgFacility); }

        if (StockFacility != null) { facilities.Add(StockFacility); }

        if (ShipFacility != null) { facilities.Add(ShipFacility); }

        string facilitiesString = facilities.Dump();

        string transitChain = GetTransitChain().Dump("->");

        string result = $"Stocked: {IsStocked}\n\t{facilitiesString}\n{transitChain}\n";

        return result;

    }

}