using System;
using System.Collections;

namespace Server.Engines.ConPVP
{
	public class LadderController : Item
	{
		private Ladder m_Ladder;

		//[CommandProperty( AccessLevel.GameMaster )]
		public Ladder Ladder{ get => m_Ladder;
			set{} }

		public override string DefaultName => "ladder controller";

		[Constructible]
		public LadderController() : base( 0x1B7A )
		{
			Visible = false;
			Movable = false;

			m_Ladder = new Ladder();

			if ( Ladder.Instance == null )
				Ladder.Instance = m_Ladder;
		}

		public override void Delete()
		{
			if ( Ladder.Instance == m_Ladder )
				Ladder.Instance = null;

			base.Delete();
		}

		public LadderController( Serial serial ) : base( serial )
		{
		}

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

			writer.Write( (int) 1 );

			m_Ladder.Serialize( writer );

			writer.Write( (bool) ( Ladder.Instance == m_Ladder ) );
		}

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

			int version = reader.ReadInt();

			switch ( version )
			{
				case 1:
				case 0:
				{
					m_Ladder = new Ladder( reader );

					if ( version < 1 || reader.ReadBool() )
						Ladder.Instance = m_Ladder;

					break;
				}
			}
		}
	}

	public class Ladder
	{
		private static int[] m_ShortLevels = {
				1,
				2,
				3, 3,
				4, 4,
				5, 5, 5,
				6, 6, 6,
				7, 7, 7, 7,
				8, 8, 8, 8,
				9, 9, 9, 9, 9
			};

		public static int GetLevel( int xp )
		{
			if ( xp >= 22500 )
				return 50;
			else if ( xp >= 2500 )
				return (10 + ((xp - 2500) / 500));
			else if ( xp < 0 )
				xp = 0;

			return m_ShortLevels[xp / 100];
		}

		private static int[] m_BaseXP = {
				0, 100, 200, 400, 600, 900, 1200, 1600, 2000, 2500
			};

		public static void GetLevelInfo( int level, out int xpBase, out int xpAdvance )
		{
			if ( level >= 10 )
			{
				xpBase = 2500 + ((level-10)*500);
				xpAdvance = 500;
			}
			else
			{
				xpBase = m_BaseXP[level-1];
				xpAdvance = m_BaseXP[level] - xpBase;
			}
		}

		private static int[] m_LossFactors = {
				10,
				11, 11,
				25, 25,
				43, 43,
				67, 67
			};

		public static int GetLossFactor( int level )
		{
			if ( level >= 10 )
				return 100;

			return m_LossFactors[level - 1];
		}

		private static int[,] m_OffsetScalar = {
					  /* { win, los } */
				/* -6 */ { 175,  25 },
				/* -5 */ { 165,  35 },
				/* -4 */ { 155,  45 },
				/* -3 */ { 145,  55 },
				/* -2 */ { 130,  70 },
				/* -1 */ { 115,  85 },
				/*  0 */ { 100, 100 },
				/* +1 */ {  90, 110 },
				/* +2 */ {  80, 120 },
				/* +3 */ {  70, 130 },
				/* +4 */ {  60, 140 },
				/* +5 */ {  50, 150 },
				/* +6 */ {  40, 160 }
			};

		public static int GetOffsetScalar( int ourLevel, int theirLevel, bool win )
		{
			int x = ourLevel - theirLevel;

			if ( x < -6 || x > +6 )
				return 0;

			int y = win ? 0 : 1;

			return m_OffsetScalar[x+6, y];
		}

		public static int GetExperienceGain( LadderEntry us, LadderEntry them, bool weWon )
		{
			if ( us == null || them == null )
				return 0;

			int ourLevel = GetLevel( us.Experience );
			int theirLevel = GetLevel( them.Experience );

			int scalar = GetOffsetScalar( ourLevel, theirLevel, weWon );

			if ( scalar == 0 )
				return 0;

			int xp = 25 * scalar;

			if ( !weWon )
				xp = (xp * GetLossFactor( ourLevel )) / 100;

			xp /= 100;

			if ( xp <= 0 )
				xp = 1;

			return xp * (weWon ? 1 : -1);
		}

		private Hashtable m_Table;
		private ArrayList m_Entries;

		public ArrayList ToArrayList()
		{
			return m_Entries;
		}

		private int Swap( int idx, int newIdx )
		{
			object hold = m_Entries[idx];

			m_Entries[idx] = m_Entries[newIdx];
			m_Entries[newIdx] = hold;

			((LadderEntry)m_Entries[idx]).Index = idx;
			((LadderEntry)m_Entries[newIdx]).Index = newIdx;

			return newIdx;
		}

		public void UpdateEntry( LadderEntry entry )
		{
			int index = entry.Index;

			if ( index >= 0 && index < m_Entries.Count )
			{
				// sanity

				int c;

				while ( (index - 1) >= 0 && (c = entry.CompareTo( m_Entries[index - 1] )) < 0 )
					index = Swap( index, index - 1 );

				while ( (index + 1) < m_Entries.Count && (c = entry.CompareTo( m_Entries[index + 1] )) > 0 )
					index = Swap( index, index + 1 );
			}
		}

		public LadderEntry Find( Mobile mob )
		{
			LadderEntry entry = (LadderEntry) m_Table[mob];

			if ( entry == null )
			{
				m_Table[mob] = entry = new LadderEntry( mob, this );
				entry.Index = m_Entries.Count;
				m_Entries.Add( entry );
			}

			return entry;
		}

		public LadderEntry FindNoCreate( Mobile mob )
		{
			return m_Table[mob] as LadderEntry;
		}

		private static Ladder m_Instance;

		public static Ladder Instance{ get => m_Instance;
			set => m_Instance = value;
		}

		public Ladder()
		{
			m_Table = new Hashtable();
			m_Entries = new ArrayList();
		}

		public Ladder( GenericReader reader )
		{
			int version = reader.ReadEncodedInt();

			switch ( version )
			{
				case 1:
				case 0:
				{
					int count = reader.ReadEncodedInt();

					m_Table = new Hashtable( count );
					m_Entries = new ArrayList( count );

					for ( int i = 0; i < count; ++i )
					{
						LadderEntry entry = new LadderEntry( reader, this, version );

						if ( entry.Mobile != null )
						{
							m_Table[entry.Mobile] = entry;
							entry.Index = m_Entries.Count;
							m_Entries.Add( entry );
						}
					}

					if ( version == 0 )
					{
						m_Entries.Sort();

						for ( int i = 0; i < m_Entries.Count; ++i )
						{
							LadderEntry entry = (LadderEntry)m_Entries[i];

							entry.Index = i;
						}
					}

					break;
				}
			}
		}

		public void Serialize( GenericWriter writer )
		{
			writer.WriteEncodedInt( (int) 1 ); // version;

			writer.WriteEncodedInt( (int) m_Entries.Count );

			for ( int i = 0; i < m_Entries.Count; ++i )
				((LadderEntry)m_Entries[i]).Serialize( writer );
		}
	}

	public class LadderEntry : IComparable
	{
		private Mobile m_Mobile;
		private int m_Experience;
		private int m_Wins;
		private int m_Losses;
		private int m_Index;
		private Ladder m_Ladder;

		public Mobile Mobile => m_Mobile;

		[CommandProperty( AccessLevel.GameMaster, AccessLevel.Administrator )]
		public int Experience{ get => m_Experience;
			set{ m_Experience = value; m_Ladder.UpdateEntry(this); } }

		[CommandProperty( AccessLevel.GameMaster, AccessLevel.Administrator )]
		public int Wins{ get => m_Wins;
			set => m_Wins = value;
		}

		[CommandProperty( AccessLevel.GameMaster, AccessLevel.Administrator )]
		public int Losses{ get => m_Losses;
			set => m_Losses = value;
		}

		public int Index{ get => m_Index;
			set => m_Index = value;
		}

		[CommandProperty( AccessLevel.GameMaster )]
		public int Rank => m_Index;

		public LadderEntry( Mobile mob, Ladder ladder )
		{
			m_Ladder = ladder;
			m_Mobile = mob;
		}

		public LadderEntry( GenericReader reader, Ladder ladder, int version )
		{
			m_Ladder = ladder;

			switch ( version )
			{
				case 1:
				case 0:
				{
					m_Mobile = reader.ReadMobile();
					m_Experience = reader.ReadEncodedInt();
					m_Wins = reader.ReadEncodedInt();
					m_Losses = reader.ReadEncodedInt();

					break;
				}
			}
		}

		public void Serialize( GenericWriter writer )
		{
			writer.Write( (Mobile) m_Mobile );
			writer.WriteEncodedInt( (int) m_Experience );
			writer.WriteEncodedInt( (int) m_Wins );
			writer.WriteEncodedInt( (int) m_Losses );
		}

		public int CompareTo( object obj )
		{
			return ((LadderEntry)obj).m_Experience - m_Experience;
		}
	}
}