using System;
using System.Collections.Generic;
using Server.Gumps;
using Server.Items;
using Server.Mobiles;

namespace Server.Engines.MLQuests.Objectives
{
	public class DeliverObjective : BaseObjective
	{
		public Type Delivery { get; set; }

		public int Amount { get; set; }

		public TextDefinition Name { get; set; }

		public Type Destination { get; set; }

		public bool SpawnsDelivery { get; set; }

		public DeliverObjective( Type delivery, int amount, TextDefinition name, Type destination )
			: this( delivery, amount, name, destination, true )
		{
		}

		public DeliverObjective( Type delivery, int amount, TextDefinition name, Type destination, bool spawnsDelivery )
		{
			Delivery = delivery;
			Amount = amount;
			Name = name;
			Destination = destination;
			SpawnsDelivery = spawnsDelivery;

			if ( MLQuestSystem.Debug && name.Number > 0 )
			{
				int itemid = CollectObjective.LabelToItemID( name.Number );

				if ( itemid <= 0 || itemid > 0x4000 )
					Console.WriteLine( "Warning: cliloc {0} is likely giving the wrong item ID", name.Number );
			}
		}

		public virtual void SpawnDelivery( Container pack )
		{
			if ( !SpawnsDelivery || pack == null )
				return;

			List<Item> delivery = new List<Item>();

			for ( int i = 0; i < Amount; ++i )
			{
				if ( !(Activator.CreateInstance( Delivery ) is Item item) )
					continue;

				delivery.Add( item );

				if ( item.Stackable && Amount > 1 )
				{
					item.Amount = Amount;
					break;
				}
			}

			foreach ( Item item in delivery )
				pack.DropItem( item ); // Confirmed: on OSI items are added even if your pack is full
		}

		public override void WriteToGump( Gump g, ref int y )
		{
			string amount = Amount.ToString();

			g.AddHtmlLocalized( 98, y, 312, 16, 1072207, 0x15F90, false, false ); // Deliver
			g.AddLabel( 143, y, 0x481, amount );

			if ( Name.Number > 0 )
			{
				g.AddHtmlLocalized( 143 + amount.Length * 15, y, 190, 18, Name.Number, 0x77BF, false, false );
				g.AddItem( 350, y, CollectObjective.LabelToItemID( Name.Number ) );
			}
			else if ( Name.String != null )
			{
				g.AddLabel( 143 + amount.Length * 15, y, 0x481, Name.String );
			}

			y += 32;

			g.AddHtmlLocalized( 103, y, 120, 16, 1072379, 0x15F90, false, false ); // Deliver to
			g.AddLabel( 223, y, 0x481, QuesterNameAttribute.GetQuesterNameFor( Destination ) );

			y += 16;
		}

		public override BaseObjectiveInstance CreateInstance( MLQuestInstance instance )
		{
			return new DeliverObjectiveInstance( this, instance );
		}
	}

	#region Timed

	public class TimedDeliverObjective : DeliverObjective
	{
		public override bool IsTimed => true;
		public override TimeSpan Duration { get; }

		public TimedDeliverObjective( TimeSpan duration, Type delivery, int amount, TextDefinition name, Type destination )
			: this( duration, delivery, amount, name, destination, true )
		{
		}

		public TimedDeliverObjective( TimeSpan duration, Type delivery, int amount, TextDefinition name, Type destination, bool spawnsDelivery )
			: base( delivery, amount, name, destination, spawnsDelivery )
		{
			Duration = duration;
		}
	}

	#endregion

	public class DeliverObjectiveInstance : BaseObjectiveInstance
	{
		public DeliverObjective Objective { get; set; }

		public bool HasCompleted { get; set; }

		public DeliverObjectiveInstance( DeliverObjective objective, MLQuestInstance instance )
			: base( instance, objective )
		{
			Objective = objective;
		}

		public virtual bool IsDestination( IQuestGiver quester, Type type )
		{
			Type destType = Objective.Destination;

			return ( destType != null && destType.IsAssignableFrom( type ) );
		}

		public override bool IsCompleted()
		{
			return HasCompleted;
		}

		public override void OnQuestAccepted()
		{
			Objective.SpawnDelivery( Instance.Player.Backpack );
		}

		// This is VERY similar to CollectObjective.GetCurrentTotal
		private int GetCurrentTotal()
		{
			Container pack = Instance.Player.Backpack;

			if ( pack == null )
				return 0;

			Item[] items = pack.FindItemsByType( Objective.Delivery, false ); // Note: subclasses are included
			int total = 0;

			foreach ( Item item in items )
				total += item.Amount;

			return total;
		}

		public override bool OnBeforeClaimReward()
		{
			PlayerMobile pm = Instance.Player;

			int total = GetCurrentTotal();
			int desired = Objective.Amount;

			if ( total < desired )
			{
				pm.SendLocalizedMessage( 1074861 ); // You do not have everything you need!
				pm.SendLocalizedMessage( 1074885, $"{total}\t{desired}"); // You have ~1_val~ item(s) but require ~2_val~
				return false;
			}

			return true;
		}

		// TODO: This is VERY similar to CollectObjective.OnClaimReward
		public override void OnClaimReward()
		{
			Container pack = Instance.Player.Backpack;

			if ( pack == null )
				return;

			Item[] items = pack.FindItemsByType( Objective.Delivery, false );
			int left = Objective.Amount;

			foreach ( Item item in items )
			{
				if ( left == 0 )
					break;

				if ( item.Amount > left )
				{
					item.Consume( left );
					left = 0;
				}
				else
				{
					item.Delete();
					left -= item.Amount;
				}
			}
		}

		public override void OnQuestCancelled()
		{
			OnClaimReward(); // same effect
		}

		public override void OnExpire()
		{
			OnQuestCancelled();

			Instance.Player.SendLocalizedMessage( 1074813 ); // You have failed to complete your delivery.
		}

		public override void WriteToGump( Gump g, ref int y )
		{
			Objective.WriteToGump( g, ref y );

			base.WriteToGump( g, ref y );

			// No extra instance stuff printed for this objective
		}

		public override DataType ExtraDataType => DataType.DeliverObjective;

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

			writer.Write( HasCompleted );
		}
	}
}