using System;
using System.Collections.Generic;
using Server.Accounting;

namespace Server.Misc
{
  public enum GiftResult
  {
    Backpack,
    BankBox
  }

  public class GiftGiving
  {
    private static readonly List<GiftGiver> m_Givers = new List<GiftGiver>();

    public static void Register(GiftGiver giver)
    {
      m_Givers.Add(giver);
    }

    public static void Initialize()
    {
      EventSink.Login += EventSink_Login;
    }

    private static void EventSink_Login(Mobile m)
    {
      if (!(m.Account is Account acct))
        return;

      DateTime now = DateTime.UtcNow;

      for (int i = 0; i < m_Givers.Count; ++i)
      {
        GiftGiver giver = m_Givers[i];

        if (now < giver.Start || now >= giver.Finish)
          continue; // not in the correct time frame

        if (acct.Created > giver.Start - giver.MinimumAge)
          continue; // newly created account

        if (acct.LastLogin >= giver.Start)
          continue; // already got one

        giver.DelayGiveGift(TimeSpan.FromSeconds(5.0), m);
      }

      acct.LastLogin = now;
    }
  }

  public abstract class GiftGiver
  {
    public virtual TimeSpan MinimumAge => TimeSpan.FromDays(30.0);

    public abstract DateTime Start { get; }
    public abstract DateTime Finish { get; }
    public abstract void GiveGift(Mobile mob);

    public virtual void DelayGiveGift(TimeSpan delay, Mobile mob)
    {
      Timer.DelayCall(delay, GiveGift, mob);
    }

    public virtual GiftResult GiveGift(Mobile mob, Item item)
    {
      if (mob.PlaceInBackpack(item) && !WeightOverloading.IsOverloaded(mob))
        return GiftResult.Backpack;

      mob.BankBox.DropItem(item);
      return GiftResult.BankBox;
    }
  }
}