NHSE/NHSE.Core/Structures/Villager/IVillagerOrigin.cs

using System;

namespace NHSE.Core;

public interface IVillagerOrigin
{
    string PlayerName { get; }
    string TownName { get; }
    Span<byte> GetTownIdentity();
    Span<byte> GetPlayerIdentity();
}

public static class VillagerOriginExtensions
{
    public static bool IsOriginatedFrom(this IVillagerOrigin visit, IVillagerOrigin host)
    {
        return visit.IsSameTown(host) && visit.IsSamePlayer(host);
    }

    public static bool IsSameTown(this IVillagerOrigin visit, IVillagerOrigin host)
    {
        var hostTown = host.GetTownIdentity();
        var visitTown = visit.GetTownIdentity();
        return hostTown.SequenceEqual(visitTown);
    }

    public static bool IsSamePlayer(this IVillagerOrigin visit, IVillagerOrigin host)
    {
        var hostPlayer = host.GetPlayerIdentity();
        var visitPlayer = visit.GetPlayerIdentity();
        return hostPlayer.SequenceEqual(visitPlayer);
    }

    public static void ChangeOrigins(this IVillagerOrigin visit, IVillagerOrigin host, Span<byte> visitData)
    {
        visit.ChangeToHostTown(host, visitData);
        visit.ChangeToHostPlayer(host, visitData);
    }

    private static void ChangeToHostTown(this IVillagerOrigin visit, IVillagerOrigin host, Span<byte> visitData)
    {
        var hostTown = host.GetTownIdentity();
        var visitTown = visit.GetTownIdentity().ToArray();
        visitData.ReplaceOccurrences(visitTown, hostTown);
    }

    private static void ChangeToHostPlayer(this IVillagerOrigin visit, IVillagerOrigin host, Span<byte> visitData)
    {
        var hostPlayer = host.GetPlayerIdentity();
        var visitPlayer = visit.GetPlayerIdentity().ToArray();
        visitData.ReplaceOccurrences(visitPlayer, hostPlayer);
    }
}