using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Reflection;
using NTERA.Core.Interop;
using NTERA.Engine.Compiler;

namespace NTERA.Engine.Runtime.Base
{
	public static class Keywords
	{
		[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
		private class KeywordAttribute : Attribute
		{
			public string Name { get; }

			public bool ImplicitString { get; }
			public bool ImplicitFormatted { get; }

			public KeywordAttribute(string name, bool implicitString = false, bool implicitFormatted = false)
			{
				if (implicitFormatted && !implicitString)
					throw new ArgumentException("Keyword cannot support formatting if it does not use implicit strings");

				Name = name;

				ImplicitString = implicitString;
				ImplicitFormatted = implicitFormatted;
			}
		}

		public static Dictionary<string, Action<EraRuntime, StackFrame, ExecutionNode>> StaticKeywords { get; } = _getKeywords();

		private static Dictionary<string, Action<EraRuntime, StackFrame, ExecutionNode>> _getKeywords()
		{
			var output = new Dictionary<string, Action<EraRuntime, StackFrame, ExecutionNode>>();

			foreach (MethodInfo method in typeof(Keywords).GetMethods(BindingFlags.Public | BindingFlags.Static))
			{
				var keywords = method.GetCustomAttributes<KeywordAttribute>();

				foreach (KeywordAttribute keyword in keywords)
					output[keyword.Name] = (runtime, context, node) => { method.Invoke(null, new object[] { runtime, context, node }); };
			}

			return output;
		}

		[Keyword("TIMES")]
		public static void Times(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			Variable variable = runtime.ComputeVariable(context, node[0], out var index);

			variable[index] *= runtime.ComputeExpression(context, node[1]);
		}

		[Keyword("VARSIZE")]
		public static void Varsize(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			Variable variable = runtime.ComputeVariable(context, node[0], out var index);

			int maxArrayDimensions = variable.Max(x => x.Key.Length);
			var resultVariable = runtime.GlobalVariables["RESULT"];

			for (int i = 0; i < maxArrayDimensions; i++)
			{
				resultVariable[i] = variable.Where(x => x.Key.Length > i).Max(x => x.Key[i]) + 1;
			}
		}

		[Keyword("ALIGNMENT")]
		public static void Alignment(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			string alignmentType = runtime.ComputeExpression(context, node[0]).String;

			if (!Enum.TryParse(alignmentType, true, out DisplayLineAlignment alignmentValue))
				throw new EraRuntimeException($"Unable to parse alignment type: '{alignmentType}'");

			runtime.Console.Alignment = alignmentValue;
		}

		[Keyword("SETCOLOR")]
		public static void SetColor(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			if (node.SubNodes.Length == 1)
			{
				uint argb = (uint)runtime.ComputeExpression(context, node[0]).Real;
				argb |= 0xFF000000U;

				Color c = Color.FromArgb((int)argb);

				runtime.Console.SetStringStyle(c);
			}
			else if (node.SubNodes.Length == 3)
			{
				int r = (int)runtime.ComputeExpression(context, node[0]).Real;
				int g = (int)runtime.ComputeExpression(context, node[1]).Real;
				int b = (int)runtime.ComputeExpression(context, node[2]).Real;

				runtime.Console.SetStringStyle(Color.FromArgb(r, g, b));
			}
			else
				throw new EraRuntimeException("Unable to parse color");
		}

		[Keyword("RESETCOLOR")]
		public static void ResetColor(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			runtime.Console.ResetStyle();
		}

		[Keyword("DRAWLINE")]
		public static void DrawLine(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			runtime.Console.PrintBar();
		}

		[Keyword("DRAWLINEFORM", true, true)]
		public static void DrawLineForm(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var value = runtime.ComputeExpression(context, node.Single());

			runtime.Console.printCustomBar(value.ToString());
		}

		[Keyword("PRINT_IMG")]
		public static void PrintImg(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var value = runtime.ComputeExpression(context, node.Single());

			runtime.Console.PrintImg(value.ToString());
		}

		[Keyword("PRINTBUTTON")]
		public static void PrintButton(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var textValue = runtime.ComputeExpression(context, node[0]);
			var intValue = runtime.ComputeExpression(context, node[1]);

			runtime.Console.PrintButton(textValue.String, (long)intValue.Real);
		}

		[Keyword("HTML_PRINT")]
		public static void PrintHtml(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var htmlValue = runtime.ComputeExpression(context, node.Single());

			runtime.Console.PrintHtml(htmlValue.String, false);
		}

		[Keyword("PRINT", true, false)]
		[Keyword("PRINTFORM", true, true)]
		public static void Print(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var value = runtime.ComputeExpression(context, node.Single());

			runtime.Console.Write(value.ToString());
		}

		[Keyword("PRINTFORML", true, true)]
		[Keyword("PRINTL", true, false)]
		public static void PrintLine(EraRuntime runtime, StackFrame context, ExecutionNode node)
		{
			var value = runtime.ComputeExpression(context, node.Single());

			runtime.Console.PrintSingleLine(value.ToString());
		}
	}
}