using System;

namespace Server.Factions
{
	public interface IFactionItem
	{
		FactionItem FactionItemState{ get; set; }
	}

	public class FactionItem
	{
		public static readonly TimeSpan ExpirationPeriod = TimeSpan.FromDays( 21.0 );

		private Item m_Item;
		private Faction m_Faction;
		private DateTime m_Expiration;

		public Item Item => m_Item;
		public Faction Faction => m_Faction;
		public DateTime Expiration => m_Expiration;

		public bool HasExpired
		{
			get
			{
				if ( m_Item == null || m_Item.Deleted )
					return true;

				return ( m_Expiration != DateTime.MinValue && DateTime.UtcNow >= m_Expiration );
			}
		}

		public void StartExpiration()
		{
			m_Expiration = DateTime.UtcNow + ExpirationPeriod;
		}

		public void CheckAttach()
		{
			if ( !HasExpired )
				Attach();
			else
				Detach();
		}

		public void Attach()
		{
			if ( m_Item is IFactionItem item )
				item.FactionItemState = this;

			m_Faction?.State.FactionItems.Add( this );
		}

		public void Detach()
		{
			if ( m_Item is IFactionItem item )
				item.FactionItemState = null;

			if ( m_Faction != null && m_Faction.State.FactionItems.Contains( this ) )
				m_Faction.State.FactionItems.Remove( this );
		}

		public FactionItem( Item item, Faction faction )
		{
			m_Item = item;
			m_Faction = faction;
		}

		public FactionItem( GenericReader reader, Faction faction )
		{
			int version = reader.ReadEncodedInt();

			switch ( version )
			{
				case 0:
				{
					m_Item = reader.ReadItem();
					m_Expiration = reader.ReadDateTime();
					break;
				}
			}

			m_Faction = faction;
		}

		public void Serialize( GenericWriter writer )
		{
			writer.WriteEncodedInt( (int) 0 );

			writer.Write( (Item) m_Item );
			writer.Write( (DateTime) m_Expiration );
		}

		public static int GetMaxWearables( Mobile mob )
		{
			PlayerState pl = PlayerState.Find( mob );

			if ( pl == null )
				return 0;

			if ( pl.Faction.IsCommander( mob ) )
				return 9;

			return pl.Rank.MaxWearables;
		}

		public static FactionItem Find( Item item )
		{
			if ( item is IFactionItem factionItem )
			{
				FactionItem state = factionItem.FactionItemState;

				if ( state?.HasExpired == true )
				{
					state.Detach();
					state = null;
				}

				return state;
			}

			return null;
		}

		public static Item Imbue( Item item, Faction faction, bool expire, int hue )
		{
			if ( !(item is IFactionItem) )
				return item;

			FactionItem state = Find( item );

			if ( state == null )
			{
				state = new FactionItem( item, faction );
				state.Attach();
			}

			if ( expire )
				state.StartExpiration();

			item.Hue = hue;
			return item;
		}
	}
}