namespace Server.Engines.MLQuests
{
  public class MLQuestPersistence : Item
  {
    private static MLQuestPersistence m_Instance;

    private MLQuestPersistence()
      : base(1) =>
      Movable = false;

    public MLQuestPersistence(Serial serial) : base(serial) => m_Instance = this;

    public override string DefaultName => "ML quests persistence - Internal";

    public static void EnsureExistence()
    {
      m_Instance ??= new MLQuestPersistence();
    }

    public override void Serialize(IGenericWriter writer)
    {
      base.Serialize(writer);

      writer.Write(2); // version
      writer.Write(MLQuestSystem.Contexts.Count);

      foreach (MLQuestContext context in MLQuestSystem.Contexts.Values)
        context.Serialize(writer);

      writer.Write(MLQuestSystem.Quests.Count);

      foreach (MLQuest quest in MLQuestSystem.Quests.Values)
        MLQuest.Serialize(writer, quest);
    }

    public override void Deserialize(IGenericReader reader)
    {
      base.Deserialize(reader);

      int version = reader.ReadInt();
      int contexts = reader.ReadInt();

      for (int i = 0; i < contexts; ++i)
      {
        MLQuestContext context = new MLQuestContext(reader, version);

        if (context.Owner != null)
          MLQuestSystem.Contexts[context.Owner] = context;
      }

      int quests = reader.ReadInt();

      for (int i = 0; i < quests; ++i)
        MLQuest.Deserialize(reader, version);
    }
  }
}