using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;

// ReSharper disable once CheckNamespace
namespace GameDevWare.Serialization
{
	public static class JsonReaderExtentions
	{
		public static void ReadArrayBegin(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			if (reader.Token != JsonToken.BeginArray)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.BeginArray);
			if (reader.IsEndOfStream())
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.EndOfArray);

			if (nextToken)
				reader.NextToken();
		}
		public static void ReadArrayEnd(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			if (reader.Token != JsonToken.EndOfArray)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.EndOfArray);

			if (nextToken)
				reader.NextToken();
		}

		public static void ReadObjectBegin(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			if (reader.Token != JsonToken.BeginObject)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.BeginObject);
			if (reader.IsEndOfStream())
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.EndOfObject);

			if (nextToken)
				reader.NextToken();
		}
		public static void ReadObjectEnd(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");
			if (reader.Token != JsonToken.EndOfObject)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.EndOfObject);


			if (nextToken)
				reader.NextToken();
		}

		public static string ReadMember(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			if (reader.Token != JsonToken.Member)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.Member);

			var memberName = (string)reader.RawValue;

			if (nextToken)
				reader.NextToken();

			return memberName;
		}

		public static byte ReadByte(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(byte);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsByte;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static byte? ReadByteOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(byte?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsByte;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static sbyte ReadSByte(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(sbyte);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsSByte;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static sbyte? ReadSByteOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(sbyte?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsSByte;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static short ReadInt16(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(short);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsInt16;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static short? ReadInt16OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(short?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsInt16;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static int ReadInt32(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(int);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsInt32;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static int? ReadInt32OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(int?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsInt32;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static long ReadInt64(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(long);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsInt64;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static long? ReadInt64OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(long?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsInt64;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}
			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static ushort ReadUInt16(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(ushort);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsUInt16;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static ushort? ReadUInt16OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(ushort?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsUInt16;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static uint ReadUInt32(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(uint);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsUInt32;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static uint? ReadUInt32OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(uint?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsUInt32;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static ulong ReadUInt64(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(ulong);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsUInt64;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static ulong? ReadUInt64OrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(ulong?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsUInt64;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static float ReadSingle(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(float);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsSingle;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static float? ReadSingleOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(float?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsSingle;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static double ReadDouble(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(double);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsDouble;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static double? ReadDoubleOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(double?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsDouble;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static decimal ReadDecimal(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(decimal);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number)
				value = reader.Value.AsDecimal;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static decimal? ReadDecimalOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(decimal?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
					value = reader.Value.AsDecimal;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static bool ReadBoolean(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(bool);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Boolean)
				value = reader.Value.AsBoolean;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Boolean);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static bool? ReadBooleanOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(bool?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Boolean:
					value = reader.Value.AsBoolean;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Boolean);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static DateTime ReadDateTime(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(DateTime);
			if (reader.Token == JsonToken.Member || reader.Token == JsonToken.StringLiteral || reader.Token == JsonToken.Number || reader.Token == JsonToken.DateTime)
				value = reader.Value.AsDateTime;
			else
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number, JsonToken.DateTime);

			if (nextToken)
				reader.NextToken();

			return value;
		}
		public static DateTime? ReadDateTimeOrNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");


			var value = default(DateTime?);
			switch (reader.Token)
			{
				case JsonToken.Null:
					value = null;
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
				case JsonToken.DateTime:
					value = reader.Value.AsDateTime;
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number, JsonToken.DateTime);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static string ReadString(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");

			var stringValue = default(string);
			switch (reader.Token)
			{
				case JsonToken.Null:
					break;
				case JsonToken.Member:
				case JsonToken.StringLiteral:
				case JsonToken.Number:
				case JsonToken.DateTime:
				case JsonToken.Boolean:
					stringValue = Convert.ToString(reader.RawValue, reader.Context.Format);
					break;
				default:
					throw JsonSerializationException.UnexpectedToken(reader, JsonToken.StringLiteral, JsonToken.Number, JsonToken.DateTime, JsonToken.Boolean);
			}

			if (nextToken)
				reader.NextToken();

			return stringValue;
		}

		public static void ReadNull(this IJsonReader reader, bool nextToken = true)
		{
			if (reader == null)
				throw new ArgumentNullException("reader");

			if (reader.Token != JsonToken.Null)
				throw JsonSerializationException.UnexpectedToken(reader, JsonToken.Null);

			if (nextToken)
				reader.NextToken();
		}

		public static object ReadValue(this IJsonReader reader, Type valueType, bool nextToken = true)
		{
			if (reader == null) throw new ArgumentNullException("reader");

			// try guess type
			if (valueType == typeof(object))
				valueType = reader.Value.Type;

			var value = default(object);
			var isNullable = valueType.IsValueType == false || valueType.IsInstantiationOf(typeof(Nullable<>));
			if (reader.Token == JsonToken.Null && isNullable)
			{
				value = null;
			}
			else
			{
				if (isNullable && valueType.IsValueType)
					valueType = valueType.GetGenericArguments()[0]; // get subtype of Nullable<T>

				var serializer = reader.Context.GetSerializerForType(valueType);
				value = serializer.Deserialize(reader);
			}

			if (nextToken)
				reader.NextToken();

			return value;
		}

		public static string DebugPrintTokens(this IJsonReader reader)
		{
			if (reader == null) throw new ArgumentNullException("reader");

			var output = new StringBuilder();
			var stack = new Stack<JsonToken>();
			stack.Push(JsonToken.None);
			while (reader.NextToken())
			{
				var strValue = reader.Token + (reader.Value.HasValue && reader.Value != null ? "[<" + reader.Value.Type.Name + "> " + JsonUtils.EscapeAndQuote(reader.Value.AsString).Trim('"') + "]" : "");

				if (stack.Peek() != JsonToken.Member)
				{
					var endingTokenIndent = (reader.Token == JsonToken.EndOfObject || reader.Token == JsonToken.EndOfArray ? -1 : 0);
					output.Append(Environment.NewLine);
					for (var i = 0; i < System.Linq.Enumerable.Count(stack, t => t != JsonToken.Member && t != JsonToken.None) + endingTokenIndent; i++)
						output.Append("\t");
				}
				else
				{
					output.Append(" ");
				}

				output.Append(strValue);

				if (reader.Token == JsonToken.EndOfObject || reader.Token == JsonToken.EndOfArray || stack.Peek() == JsonToken.Member)
					stack.Pop();
				if (reader.Token == JsonToken.BeginObject || reader.Token == JsonToken.BeginArray || reader.Token == JsonToken.Member)
					stack.Push(reader.Token);
			}
			return output.ToString();
		}
	}
}