using System;

namespace Server.Items
{
	[PropertyObject]
	public class TalismanAttribute
	{
		private Type m_Type;
		private TextDefinition m_Name;
		private int m_Amount;

		[CommandProperty( AccessLevel.GameMaster )]
		public Type Type
		{
			get => m_Type;
			set => m_Type = value;
		}

		[CommandProperty( AccessLevel.GameMaster )]
		public TextDefinition Name
		{
			get => m_Name;
			set => m_Name = value;
		}

		[CommandProperty( AccessLevel.GameMaster )]
		public int Amount
		{
			get => m_Amount;
			set => m_Amount = value;
		}

		[CommandProperty( AccessLevel.GameMaster )]
		public bool IsEmpty => m_Type == null;

		[CommandProperty( AccessLevel.GameMaster )]
		public bool IsItem => m_Type != null && m_Type.Namespace.Equals( "Server.Items" );

		public TalismanAttribute() : this( null, 0, 0 )
		{
		}

		public TalismanAttribute( TalismanAttribute copy )
		{
			if ( copy != null )
			{
				m_Type = copy.Type;
				m_Name = copy.Name;
				m_Amount = copy.Amount;
			}
		}

		public TalismanAttribute( Type type, TextDefinition name ) : this( type, name, 0 )
		{
		}

		public TalismanAttribute( Type type, TextDefinition name, int amount )
		{
			m_Type = type;
			m_Name = name;
			m_Amount = amount;
		}

		public TalismanAttribute( GenericReader reader )
		{
			int version = reader.ReadInt();

			SaveFlag flags = (SaveFlag) reader.ReadEncodedInt();

			if ( GetSaveFlag( flags, SaveFlag.Type ) )
				m_Type = ScriptCompiler.FindTypeByFullName( reader.ReadString(), false );

			if ( GetSaveFlag( flags, SaveFlag.Name ) )
				m_Name = TextDefinition.Deserialize( reader );

			if ( GetSaveFlag( flags, SaveFlag.Amount ) )
				m_Amount = reader.ReadEncodedInt();
		}

		public override string ToString()
		{
			if ( m_Type != null )
				return m_Type.Name;

			return "None";
		}

		private static void SetSaveFlag( ref SaveFlag flags, SaveFlag toSet, bool setIf )
		{
			if ( setIf )
				flags |= toSet;
		}

		private static bool GetSaveFlag( SaveFlag flags, SaveFlag toGet )
		{
			return ( (flags & toGet) != 0 );
		}

		[Flags]
		private enum SaveFlag
		{
			None				= 0x00000000,
			Type				= 0x00000001,
			Name				= 0x00000002,
			Amount				= 0x00000004,
		}

		public virtual void Serialize( GenericWriter writer )
		{
			writer.Write( (int) 0 ); // version

			SaveFlag flags = SaveFlag.None;

			SetSaveFlag( ref flags, SaveFlag.Type,		m_Type != null );
			SetSaveFlag( ref flags, SaveFlag.Name,		m_Name != null );
			SetSaveFlag( ref flags, SaveFlag.Amount,	m_Amount != 0 );

			writer.WriteEncodedInt( (int) flags );

			if ( GetSaveFlag( flags, SaveFlag.Type ) )
				writer.Write( m_Type.FullName );

			if ( GetSaveFlag( flags, SaveFlag.Name ) )
				TextDefinition.Serialize( writer, m_Name );

			if ( GetSaveFlag( flags, SaveFlag.Amount ) )
				writer.WriteEncodedInt( m_Amount );
		}

		public int DamageBonus( Mobile to )
		{
			if ( to != null && to.GetType() == m_Type ) // Verified: only works on the exact type
				return m_Amount;

			return 0;
		}
	}
}