basic-computer-games/16_Bug/csharp/Parts/Body.cs

using System.Text;
using BugGame.Resources;

namespace BugGame.Parts;

internal class Body : ParentPart
{
    private readonly Neck _neck = new();
    private readonly Tail _tail = new();
    private readonly Legs _legs = new();

    public Body()
        : base(Message.BodyAdded, Message.BodyNotNeeded)
    {
    }

    public override bool IsComplete => _neck.IsComplete && _tail.IsComplete && _legs.IsComplete;

    protected override bool TryAddCore(IPart part, out Message message)
        => part switch
        {
            Neck => _neck.TryAdd(out message),
            Head or Feeler => _neck.TryAdd(part, out message),
            Tail => _tail.TryAdd(out message),
            Leg => _legs.TryAddOne(out message),
            _ => throw new NotSupportedException($"Can't add a {part.Name} to a {Name}.")
        };

    public void AppendTo(StringBuilder builder, char feelerCharacter)
    {
        if (IsPresent)
        {
            _neck.AppendTo(builder, feelerCharacter);
            builder
                .AppendLine("     BBBBBBBBBBBB")
                .AppendLine("     B          B")
                .AppendLine("     B          B");
            _tail.AppendTo(builder);
            builder
                .AppendLine("     BBBBBBBBBBBB");
            _legs.AppendTo(builder);
        }
    }
}