#region References
using System;
using System.Collections.Generic;
using System.IO;
#endregion

namespace Server.Engines.Quests
{
	public class QuestWriter
	{
		public static int Version(GenericWriter writer, int version)
		{
			if (writer == null)
			{
				return -1;
			}

			writer.Write(0x7FFFFFFF); // Preamble

			writer.Write(version);

			return version;
		}

		public static bool SubWrite(GenericWriter writer, Action<GenericWriter> serializer)
		{
			if (writer == null)
			{
				return false;
			}

			using (var s = new MemoryStream())
			{
				var w = new BinaryFileWriter(s, true);

				try
				{
					serializer(w);
				}
				catch (Exception e)
				{
					Console.WriteLine("Quest Save Failure: {0}", Utility.FormatDelegate(serializer));
					Console.WriteLine(e);

					writer.Write(0L);

					return false;
				}
				finally
				{
					w.Flush();
				}

				writer.Write(s.Length);

				s.Position = 0;

				while (s.Position < s.Length)
				{
					writer.Write((byte)s.ReadByte());
				}
			}

			return true;
		}

		public static void Quests(GenericWriter writer, List<BaseQuest> quests)
		{
			if (writer == null)
			{
				return;
			}

			Version(writer, 0);

			if (quests == null)
			{
				writer.Write(0);
				return;
			}

			writer.Write(quests.Count);

			foreach (var quest in quests)
			{
				Type(writer, quest.GetType());

				SubWrite(writer, quest.Serialize);
			}
		}

		public static void Chains(GenericWriter writer, Dictionary<QuestChain, BaseChain> chains)
		{
			if (writer == null)
			{
				return;
			}

			Version(writer, 0);

			if (chains == null)
			{
				writer.Write(0);
				return;
			}

			writer.Write(chains.Count);

			foreach (var pair in chains)
			{
				writer.Write((int)pair.Key);

				Type(writer, pair.Value.CurrentQuest);
				Type(writer, pair.Value.Quester);
			}
		}

		public static void Object(GenericWriter writer, object obj)
		{
			if (writer == null)
			{
				return;
			}

			Version(writer, 0);

			if (obj is int)
			{
				writer.Write((byte)0x1);
				writer.Write((int)obj);
			}
			else if (obj is String)
			{
				writer.Write((byte)0x2);
				writer.Write((String)obj);
			}
			else if (obj is Item)
			{
				writer.Write((byte)0x3);
				writer.Write((Item)obj);
			}
			else if (obj is Mobile)
			{
				writer.Write((byte)0x4);
				writer.Write((Mobile)obj);
			}
			else
			{
				writer.Write((byte)0x0); // invalid
			}
		}

		public static void Type(GenericWriter writer, Type type)
		{
			if (writer != null)
			{
				writer.Write(type == null ? null : type.FullName);
			}
		}
	}
}