using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace apoconv
{
	public partial class Form1 : Form
	{
		private List<ParamInfo> m_Params = new List<ParamInfo>();
		private List<PrecalcParamInfo> m_StructParams = new List<PrecalcParamInfo>();
		private List<string> m_PrecalcFuncLines = new List<string>();
		private List<string> m_CalcFuncLines = new List<string>();
		private List<string> m_FinalCalcFuncLines = new List<string>();
		private readonly SortedDictionary<string, string> replacements = new SortedDictionary<string, string>()
		{
			{ "(double)", "" },
			{ "(float)", "" },
			{ "double", "T" },
			{ "float", "T" },
			//{ "0.0", "0" },
			{ "0.5", "T(0.5)" },
			{ "1.0", "T(1.0)" },
			{ "0.1", "T(0.1)" },
			{ "0.01", "T(0.01)" },
			{ "0.001", "T(0.001)" },
			{ "12.9898", "T(12.9898)" },
			{ "78.233", "T(78.233)" },
			{ "43758.5453", "T(43758.5453)" },
			{ "FTx", "helper.In.x" },
			{ "FTy", "helper.In.y" },
			{ "FTz", "helper.In.z" },
			{ "FPx", "helper.Out.x" },
			{ "FPy", "helper.Out.y" },
			{ "FPz", "helper.Out.z" },
			{ "VVAR", "m_Weight" },
			{ "floor(", "Floor<T>(" },
			{ "cel(", "std::ceil(" },
			{ "sin(", "std::sin(" },
			{ "sinh(", "std::sinh(" },
			{ "asin(", "std::asin(" },
			{ "asinh(", "std::asinh(" },

			{ "cos(", "std::cos(" },
			{ "cosh(", "std::cosh(" },
			{ "acos(", "std::acos(" },
			{ "acosh(", "std::acosh(" },

			{ "tan(", "std::tan(" },
			{ "tanh(", "std::tanh(" },
			{ "atan(", "std::atan(" },
			{ "atan2(", "std::atan2(" },
			{ "atanh(", "std::atanh(" },

			{ "sqrt(", "std::sqrt(" },
			{ "pow(", "std::pow(" },
			{ "fabs(", "std::abs(" },

			{ "sqr(", "Sqr(" },

			{ "M_E", "T(M_E)" },
			{ "M_LOG2E", "T(M_LOG2E)" },
			{ "M_LOG10E", "T(M_LOG10E)" },
			{ "M_LN2", "T(M_LN2)" },
			{ "M_LN10", "T(M_LN10)" },
			{ "M_PI", "T(M_PI)" },
			{ "M_PI_2", "T(M_PI_2)" },
			{ "M_PI_4", "T(M_PI_4)" },
			{ "M_1_PI", "T(M_1_PI)" },
			{ "M_2_PI", "T(M_2_PI)" },
			{ "M_2_SQRTPI", "T(M_2_SQRTPI)" },
			{ "M_SQRT2", "T(M_SQRT2)" },
			{ "M_SQRT1_2", "T(M_SQRT1_2)" },

		};

		public Form1()
		{
			InitializeComponent();
			//var lines = File.ReadAllLines("./waves4.cpp");
			//textBox1.Lines = lines;
		}

		string Apo2Fractorium(string[] lines, bool doexport)
		{
			if (lines.Length == 0)
				return "";

			//doexport = false;

			bool isparvar = false;
			string pluginname = "";
			string varclassname = "";
			m_Params.Clear();
			m_StructParams.Clear();
			m_PrecalcFuncLines.Clear();
			m_CalcFuncLines.Clear();
			m_FinalCalcFuncLines.Clear();

			bool structstart = false;

			foreach (var line in lines)
			{
				if (line.Contains("APO_PLUGIN"))
				{
					var splits = line.Split(new char[] { '\"' });

					if (splits.Length >= 1)
					{
						pluginname = splits[1];
						varclassname = pluginname.FirstCharToUpper() + "Variation";
					}
				}
			}

			foreach (var line in lines)
			{
				if (line.Contains("typedef struct"))
				{
					structstart = true;
					continue;
				}

				if (structstart)
				{
					if (line.Contains("{"))
						continue;

					if (line.Contains("}"))
						break;

					var splits = line.Trim().Split(new string[] { " ", ",", ";", "(", ")", "double", "float", "int", "unsigned", "long", "short", "char" }, StringSplitOptions.RemoveEmptyEntries);

					foreach (var split in splits)
					{
						m_StructParams.Add(new PrecalcParamInfo
						{
							OrigName = split.Trim(),
							Name = split.Trim(),
							MemberName = "m_" + split.RemoveFirst(pluginname + "_").FirstCharToUpper().Replace("_", "").Trim(),
						});

						isparvar = true;
					}
				}
			}

			bool paramsstart = false;

			foreach (var line in lines)
			{
				if (line.Contains("APO_VARIABLES("))
				{
					paramsstart = true;
					continue;
				}

				if (paramsstart)
				{
					if (line.Contains(");"))
						break;

					var splits = line.Split(new char[] { '(', ')', ',' });

					if (splits.Length > 2)
					{
						var pt = "";
						var l = "";
						var u = "";
						var def = "";

						if (line.Contains("VAR_INTEGER_RANGE"))
						{
							pt = "eParamType::INTEGER";

							if (splits.Length >= 5)
							{
								l = splits[2].Trim();
								u = splits[3].Trim();
								def = splits[4].Trim();
							}
						}
						else if (line.Contains("VAR_REAL_RANGE"))
						{
							pt = "eParamType::REAL";

							if (splits.Length >= 5)
							{
								l = splits[2].Trim();
								u = splits[3].Trim();
								def = splits[4].Trim();
							}
						}
						else if (line.Contains("VAR_REAL_CYCLE"))
						{
							pt = "eParamType::REAL_CYCLIC";

							if (splits.Length >= 5)
							{
								l = splits[2].Trim();
								u = splits[3].Trim();
								def = splits[4].Trim();
							}
						}
						else if (line.Contains("VAR_INTEGER_NONZERO"))
						{
							pt = "eParamType::INTEGER_NONZERO";
							def = splits[2].Trim();
						}
						else if (line.Contains("INTEGER("))
						{
							pt = "eParamType::INTEGER";
							def = splits[2].Trim();
						}
						else
							def = splits[2].Trim();

						m_Params.Add(new ParamInfo
						{
							Name = splits[1].Trim(),
							MemberName = "m_" + splits[1].RemoveFirst(pluginname + "_").FirstCharToUpper().Replace("_", "").Trim(),
							Default = def,
							Lower = l,
							Upper = u,
							ParamType = pt
						});
						isparvar = true;
					}
				}
			}

			foreach (var param in m_Params)
			{
				if (m_StructParams.Any(pi => pi.Name == param.Name))
					m_StructParams.RemoveAll(pi => pi.Name == param.Name);
			}

			foreach (var param in m_StructParams)
			{
				if (!param.Name.StartsWith(pluginname + "_"))
					param.Name = pluginname + "_" + param.Name;

				if (!param.Name.EndsWith("_precalc"))
					param.Name = param.Name + "_precalc";

				if (!param.MemberName.EndsWith("Precalc"))
					param.MemberName += "Precalc";
			}

			bool calcstart = false;
			int bracketcount = 0;

			foreach (var line in lines)
			{
				if (line.Contains("PluginVarCalc"))
				{
					calcstart = true;
					continue;
				}

				if (calcstart)
				{
					if (line.Contains("{"))
						bracketcount++;

					if (line.Contains("}"))
						bracketcount--;

					if (bracketcount <= 0)
						break;

					if (line != "{" && !line.Contains("return"))
					{
						var templine = line;

						if (line.Contains("FPx") || line.Contains("FPy") || line.Contains("FPz"))
						{
							templine = templine.Replace("+=", "=");
							templine = templine.Replace("-=", "= -(");//Will cause an error, forcing manual inspection
						}

						m_CalcFuncLines.Add(templine.Trim());
					}
				}
			}

			bool precalcstart = false;
			bracketcount = 0;

			foreach (var line in lines)
			{
				if (line.Contains("PluginVarPrepare"))
				{
					precalcstart = true;
					continue;
				}

				if (precalcstart)
				{
					if (line.Contains("{"))
						bracketcount++;

					if (line.Contains("}"))
						bracketcount--;

					if (bracketcount <= 0)
						break;

					if (line != "{" && !line.Contains("return"))
					{
						var templine = line;

						foreach (var rep in replacements)
							templine = templine.Replace(rep.Key, rep.Value);

						m_PrecalcFuncLines.Add(templine.Trim());
					}
				}
			}

			string final = "/// <summary>\r\n";
			final += "/// " + pluginname + ".\r\n";
			final += "/// </summary>\r\n";
			final += "template <typename T>\r\n";

			if (isparvar)
				final += "class " + varclassname + " : public ParametricVariation<T>\r\n";
			else
				final += "class " + varclassname + " : public Variation<T>\r\n";

			final += "{\r\n";
			final += "public:\r\n";

			if (isparvar)
				final += "\t" + varclassname + "(T weight = 1.0) : ParametricVariation<T>(\"" + pluginname + "\", eVariationId::VAR_" + pluginname.ToUpper() + ", weight)\r\n";
			else
				final += "\t" + varclassname + "(T weight = 1.0) : Variation<T>(\"" + pluginname + "\", eVariationId::VAR_" + pluginname.ToUpper() + ", weight)\r\n";

			final += "\t{\r\n";

			if (isparvar)
				final += "\t	Init();\r\n";

			final += "\t}\r\n\r\n";

			if (isparvar)
				final += "\tPARVARCOPY(" + varclassname + ")\r\n";
			else
				final += "\tVARCOPY(" + varclassname + ")\r\n";

			final += "\r\n\tvirtual void Func(IteratorHelper<T>& helper, Point<T>& outPoint, QTIsaac<ISAAC_SIZE, ISAAC_INT>& rand) override\r\n";
			final += "\t{\r\n";

			foreach (var line in m_CalcFuncLines)
			{
				var templine = "\t\t" + line;

				foreach (var rep in replacements)
					templine = templine.Replace(rep.Key, rep.Value);

				templine += "\r\n";

				foreach (var param in m_Params)
					templine = templine.Replace("VAR(" + param.Name + ")", param.MemberName);

				foreach (var param in m_StructParams)
					templine = templine.Replace("VAR(" + param.OrigName + ")", param.MemberName);

				m_FinalCalcFuncLines.Add(templine.Trim());
				final += templine;
			}

			final += "\t\thelper.Out.z = DefaultZ(helper);\r\n";
			final += "\t}\r\n";

			final += "\r\n\tvirtual string OpenCLString() const override\r\n";
			final += "\t{\r\n";
			final += "\t	ostringstream ss, ss2;\r\n";
			final += "\t	intmax_t i = 0, varIndex = IndexInXform();\r\n";
			final += "\t	ss2 << \"_\" << XformIndexInEmber() << \"]\";\r\n";
			final += "\t	string index = ss2.str();\r\n";
			final += "\t	string weight = WeightDefineString();\r\n";

			foreach (var param in m_Params)
			{
				final += "\t\tstring " + param.MemberName.Replace("m_", "").ToLower() + " = \"parVars[\" + ToUpper(m_Params[i++].Name()) + index;\r\n";
			}

			final += "\t\tss << \"\\t{\\n\"\r\n";

			foreach (var line in m_FinalCalcFuncLines)
			{
				string templine;

				if (line != "")
					templine = "\t\t<< \"\\t\\t" + line + "\\n\"\r\n";
				else
					templine = "\t\t<< \"\\n\"\r\n";

				templine = templine.Replace("\\tT ", "\\treal_t ").
						   Replace("helper.In.x", "vIn.x").
						   Replace("helper.In.y", "vIn.y").
						   Replace("helper.In.z", "vIn.z").
						   Replace("helper.Out.x", "vOut.x").
						   Replace("helper.Out.y", "vOut.y").
						   Replace("helper.Out.z", "vOut.z").
						   Replace("Floor<T>", "floor").
						   Replace("std::abs", "fabs").
						   Replace("m_Weight", "\" << weight << \"").
						   Replace("std::", "").
						   Replace("T(", "(real_t)(")
						   ;

				foreach (var param in m_Params)
				{
					if (templine.Contains(param.MemberName))
						templine = templine.Replace(param.MemberName, "\" << " + param.MemberName.Substring(2).ToLower() + " << \"");
				}

				foreach (var param in m_StructParams)
				{
					if (templine.Contains(param.MemberName))
						templine = templine.Replace(param.MemberName, "\" << " + param.MemberName.Substring(2).ToLower() + " << \"");
				}

				final += templine;
			}

			final += "\t\t<< \"\\t\\tvOut.z = \" << DefaultZCl()\r\n";
			final += "\t\t<< \"\\t}\\n\";\r\n";
			final += "\t\treturn ss.str();\r\n";
			final += "\t}\r\n";

			if (isparvar)
			{
				final += "\r\n\tvirtual void Precalc() override\r\n";
				final += "\t{\r\n";

				foreach (var line in m_PrecalcFuncLines)
				{
					var templine = line;

					foreach (var param in m_Params)
						templine = templine.Replace("VAR(" + param.Name + ")", param.MemberName);

					foreach (var param in m_StructParams)
						templine = templine.Replace("VAR(" + param.OrigName + ")", param.MemberName);

					final += "\t\t" + templine + "\r\n";
				}

				final += "\t}\r\n";
			}

			final += "\r\n\tvirtual vector<string> OpenCLGlobalFuncNames() const override\r\n";
			final += "\t{\r\n";
			final += "\t	return vector<string> { \"Zeps\" };\r\n";
			final += "\t}\r\n";
			bool saidprecalc = false;

			if (isparvar)
			{

				final += "\r\nprotected:\r\n";
				final += "\tvoid Init()\r\n";
				final += "\t{\r\n";
				final += "\t\tstring prefix = Prefix();\r\n";
				final += "\t\tm_Params.clear();\r\n";

				foreach (var param in m_Params)
					final += "\t\tm_Params.push_back(ParamWithName<T>(&" + param.MemberName
							 + ", prefix + \""
							 + param.Name
							 + (param.Default != "0" && param.Default != "0.0" && param.Default != "" || param.ParamType != "" ?
								"\", T(" + param.Default + ")"
								:
								"\"")
							 + (param.ParamType != "" ? ", " + param.ParamType : "")
							 + (param.Lower != "" ? ", T(" + param.Lower + ")" : "")
							 + (param.Upper != "" ? ", T(" + param.Upper + ")" : "")
							 + "));\r\n";

				foreach (var param in m_StructParams)
				{
					final += "\t\tm_Params.push_back(ParamWithName<T>(true, &" + param.MemberName
							 + ", prefix + \""
							 + param.Name + "\"));" + (!saidprecalc ? "//Precalc." : "") + "\r\n";
					saidprecalc = true;
				}

				final += "\t}\r\n";
				final += "\r\nprivate:\r\n";

				foreach (var param in m_Params)
					final += "\tT " + param.MemberName + ";\r\n";

				saidprecalc = false;

				foreach (var param in m_StructParams)
				{
					final += "\tT " + param.MemberName + ";" + (!saidprecalc ? "//Precalc." : "") + "\r\n";
					saidprecalc = true;
				}
			}

			final += "};\r\n\r\n";

			if (doexport)
			{
				if (isparvar)
					final += "MAKEPREPOSTPARVAR(" + pluginname.FirstCharToUpper() + ", " + pluginname + ", " + pluginname.ToUpper() + ")\r\n";
				else
					final += "MAKEPREPOSTVAR(" + pluginname.FirstCharToUpper() + ", " + pluginname + ", " + pluginname.ToUpper() + ")\r\n";

				final += "EXPORTPREPOSTREGVAR(" + pluginname.FirstCharToUpper() + ", T) \\\r\n";
				final += "ADDPREPOSTREGVAR(" + pluginname.FirstCharToUpper() + ")\r\n\r\n";
			}

			return final;
		}

		private void textBox1_TextChanged(object sender, EventArgs e)
		{
			textBox2.Text = Apo2Fractorium(textBox1.Lines, true);

		}

		private void textBox1_DragDrop(object sender, DragEventArgs e)
		{
			textBox1.TextChanged -= textBox1_TextChanged;
			string final = "";
			List<string> tb1lines = new List<string>();

			if (e.Data.GetDataPresent(DataFormats.FileDrop))
			{
				string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);

				foreach (var file in files)
				{
					var lines = File.ReadAllLines(file);
					tb1lines.AddRange(lines.ToList());
					final += Apo2Fractorium(lines, true);
				}

				textBox1.Lines = tb1lines.ToArray();
				textBox2.Text = final;
			}

			textBox1.TextChanged += textBox1_TextChanged;
		}

		private void textBox1_DragEnter(object sender, DragEventArgs e)
		{
			e.Effect = DragDropEffects.Copy;
		}
	}

	public class ParamInfo
	{
		public string Name = "";
		public string MemberName = "";
		public string Default = "";
		public string Lower = "";
		public string Upper = "";
		public string ParamType = "";
	}


	public class PrecalcParamInfo : ParamInfo
	{
		public string OrigName = "";
	}

	public static class StringExtensions
	{
		public static string FirstCharToUpper(this string input)
		{
			switch (input)
			{
				case null: throw new ArgumentNullException(nameof(input));

				case "": throw new ArgumentException($"{nameof(input)} cannot be empty", nameof(input));

				default: return input.First().ToString().ToUpper() + input.Substring(1);
			}
		}

		public static string RemoveFirst(this string input, string removeString)
		{
			int index = input.IndexOf(removeString);
			return (index < 0)
				   ? input
				   : input.Remove(index, removeString.Length);
		}
	}
}