using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NTERA.Interpreter;
using NTERA.Interpreter.Compiler;

namespace NTERA.Compiler
{
	public class Compiler
	{
		public string InputDirectory { get; }

		public List<Tuple<ParserError, string>> Errors { get; } = new List<Tuple<ParserError, string>>();
		public List<Tuple<ParserError, string>> Warnings { get; } = new List<Tuple<ParserError, string>>();

		public Dictionary<FunctionDefinition, string> DeclaredFunctions = new Dictionary<FunctionDefinition, string>();

		public Compiler(string inputDirectory)
		{
			InputDirectory = inputDirectory;
		}

		protected static string[] DefaultGlobalNumberVariables =
		{
			"LOCAL",
			"ABL",
			"RESULT",
			"SOURCE",
			"ARG",
			"GLOBAL",
			"IS",
			"CUP",
			"CDOWN",
			"UP",
			"DOWN",
			"DOWNBASE",
			"COUNT",
			"TCVAR",
			"CDFLAG",
			"ITEMPRICE",
			"RANDDATA",
			"LINECOUNT",
			"ISTIMEOUT",
			"__INT_MAX__",
			"__INT_MIN__",
			"RAND",
			"CHARANUM",
			"TALENT",
			"FLAG",
			"TFLAG",
			"CFLAG",
			"MASTER",
			"BASE",
			"MAXBASE",
			"PALAM",
			"TEQUIP",
			"EQUIP",
			"DAY",
			"MARK",
			"PALAMLV",
			"TARGET",
			"PLAYER",
			"NOWEX",
			"EX",
			"STAIN",
			"EXP",
			"ASSIPLAY",
			"ASSI",
			"ITEM",
			"EXPLV",
			"TIME",
			"MONEY",
			"SELECTCOM",
			"PREVCOM",
			"NEXTCOM",
			"DITEMTYPE",
			"NO",
			"RELATION",
			"JUEL",
			"GOTJUEL",
			"EJAC",
			"BOUGHT",
			"ITEMSALES",
			"FORWARD", //special casing for SORTCHARA
			"BACK", //special casing for SORTCHARA
			"DEBUG_MODE",
		};

		protected static string[] DefaultGlobalStringVariables =
		{
			"LOCALS",
			"ARGS",
			"RESULTS",
			"CSTR",
			"GLOBALS",
			"NICKNAME",
			"MASTERNAME",
			"NAME",
			"TRAINNAME",
			"BASENAME",
			"EQUIPNAME",
			"TEQUIPNAME",
			"STAINNAME",
			"EXNAME",
			"SOURCENAME",
			"CALLNAME",
			"FLAGNAME",
			"TFLAGNAME",
			"CFLAGNAME",
			"TCVARNAME",
			"STRNAME",
			"TSTRNAME",
			"CSTRNAME",
			"SAVESTRNAME",
			"CDFLAGNAME",
			"GLOBALNAME",
			"GLOBALSNAME",
			"GAMEBASE_AUTHOR",
			"GAMEBASE_INFO",
			"GAMEBASE_YEAR",
			"GAMEBASE_TITLE",
			"GAMEBASE_GAMECODE",
			"GAMEBASE_VERSION",
			"GAMEBASE_ALLOWVERSION",
			"GAMEBASE_DEFAULTCHARA",
			"GAMEBASE_NOITEM",
			"WINDOW_TITLE",
			"MONEYLABEL",
			"DRAWLINESTR",
			"LASTLOAD_VERSION",
			"LASTLOAD_NO",
			"LASTLOAD_TEXT",
			"SAVEDATA_TEXT",
			"TSTR",
			"STR",
			"SAVESTR",
			"ABLNAME",
			"MARKNAME",
			"TALENTNAME",
			"ITEMNAME",
			"PALAMNAME",
			"EXPNAME",
		};

		public void Compile(string outputDirectory)
		{
			var globals = new VariableDictionary();

			foreach (string stringVariable in DefaultGlobalStringVariables)
				globals.Add(stringVariable, "");

			foreach (string numberVariable in DefaultGlobalNumberVariables)
				globals.Add(numberVariable, 0);

			foreach (char c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
				globals[c.ToString()] = "";

			var funcs = new List<FunctionDefinition>
			{
				new FunctionDefinition("ABS", new[] { new FunctionParameter("a", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVCALLNAME", new[] { new FunctionParameter("a", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("TOFULL", new[] { new FunctionParameter("a", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("TOINT", new[] { new FunctionParameter("a", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("RAND", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("TOSTR", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0], "") }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("STRCOUNT", new[] { new FunctionParameter("input", new string[0]), new FunctionParameter("match", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("MIN", new[] { new FunctionParameter("a", new string[0], isArrayParameter: true), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("MAX", new[] { new FunctionParameter("a", new string[0], isArrayParameter: true), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("POWER", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETPALAMLV", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETBIT", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("UNICODE", new[] { new FunctionParameter("a", new string[0]) }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("MATCH", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]), new FunctionParameter("c", new string[0], "a"), new FunctionParameter("d", new string[0], "f"), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("INRANGE", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("b", new string[0]), new FunctionParameter("c", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("HE_SHE", new[] { new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("SUBSTRING", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("STRLENS", new[] { new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVNAME", new[] { new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVNAME", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVBASE", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVTALENT", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVCSTR", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVEXP", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CSVABL", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETNUM", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("FINDCHARA", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("LIMIT", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("SUBSTRINGU", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0]), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GROUPMATCH", new[] { new FunctionParameter("a", new string[0]), new FunctionParameter("a", new string[0], isArrayParameter: true), }, new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETTIME", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("SAVENOS", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETCOLOR", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("CURRENTREDRAW", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETFONT", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
				new FunctionDefinition("GETMILLISECOND", new FunctionParameter[0], new FunctionVariable[0], true, "_GLOBAL", new Marker()),
			};

			var stringStatements = new List<string>
			{
				"DRAWLINEFORM",
				"PRINTFORML",
				"PRINT",
				"PRINTW",
				"PRINTV",
				"PRINTL",
				"PRINTLC",
				"PRINTC",
				"ALIGNMENT",
				"CALL",
				"CUSTOMDRAWLINE",
				"DATAFORM",
				"GOTO",
				"PRINTFORMDL",
				"PRINTFORMW",
				"PRINTFORMDW",
				"PRINTFORMC",
				"PRINTFORMLC",
				"PRINTFORM",
				"PRINTPLAINFORM",
				"DEBUGPRINTL",
				"DEBUGPRINTFORML",
				"REUSELASTLINE",
				"PRINTPLAIN",
				"PRINT_TRAIN_NAME",
				"PRINT_STR",
			};

			string csvPath = Path.Combine(InputDirectory, "CSV");
			string erbPath = Path.Combine(InputDirectory, "ERB");

			var csvDefinition = new CSVDefinition();


			foreach (var file in Directory.EnumerateFiles(csvPath, "*.csv", SearchOption.AllDirectories))
			{
				string path = Path.GetFileNameWithoutExtension(file);

				if (path.EndsWith("_TR"))
					continue;

				Preprocessor.ProcessCSV(csvDefinition, path, File.ReadLines(file, Encoding.UTF8));
			}

			ConcurrentDictionary<FunctionDefinition, string> preprocessedFunctions = new ConcurrentDictionary<FunctionDefinition, string>();

#if DEBUG
			foreach (var file in Directory.EnumerateFiles(erbPath, "*.erb", SearchOption.AllDirectories))
#else
			Parallel.ForEach(Directory.EnumerateFiles(erbPath, "*.erb", SearchOption.AllDirectories), new ParallelOptions
			{
				MaxDegreeOfParallelism = 4
			}, file =>
#endif
			{
				try
				{
					foreach (var kv in Preprocessor.PreprocessFile(File.ReadAllText(file), Path.GetFileName(file)))
						preprocessedFunctions[kv.Key] = kv.Value;
				}
				catch (Exception ex)
				{
					lock (Errors)
						Errors.Add(new Tuple<ParserError, string>(new ParserError($"Internal pre-process lexer error [{ex}]", new Marker()), Path.GetFileName(file)));
				}
#if DEBUG
			}
#else
			});
#endif

			DeclaredFunctions = preprocessedFunctions.ToDictionary(kv => kv.Key, kv => kv.Value);

			funcs.AddRange(DeclaredFunctions.Keys.Where(x => x.IsReturnFunction));
			var procedures = DeclaredFunctions.Keys.Where(x => !x.IsReturnFunction).ToList();


#if DEBUG
			foreach (var kv in DeclaredFunctions)
#else
			Parallel.ForEach(DeclaredFunctions, new ParallelOptions
			{
				MaxDegreeOfParallelism = 4
			}, kv =>
#endif
			{
				try
				{
					var locals = new VariableDictionary();
					foreach (var param in kv.Key.Variables)
						locals[param.Name] = param.DefaultValue ?? param.ValueType == Interpreter.ValueType.String ? new Value("") : new Value(0d);

					Parser parser = new Parser(kv.Value, kv.Key, funcs, procedures, globals, locals, stringStatements, csvDefinition);

					var nodes = parser.Parse(out var localErrors, out var localWarnings);

					lock (Errors)
						Errors.AddRange(localErrors.Select(x => new Tuple<ParserError, string>(x, $"{kv.Key.Filename} - {kv.Key.Name}")));

					lock (Warnings)
						Warnings.AddRange(localWarnings.Select(x => new Tuple<ParserError, string>(x, $"{kv.Key.Filename} - {kv.Key.Name}")));
				}
				catch (Exception ex)
				{
					lock (Errors)
						Errors.Add(new Tuple<ParserError, string>(new ParserError($"Internal post-process lexer error [{ex}]", new Marker()), $"{kv.Key.Filename} - {kv.Key.Name}"));
				}
#if DEBUG
			}
#else
			});
#endif

			long fileSize = 0;
			int fileCount = 0;

			foreach (var file in Directory.EnumerateFiles(InputDirectory, "*.erb", SearchOption.AllDirectories))
			{
				var info = new FileInfo(file);
				fileSize += info.Length;
				fileCount++;
			}

			var htmlWriter = new HTMLWriter
			{
				Errors = Errors.OrderBy(x => x.Item2).ToList(),
				Warnings = Warnings.OrderBy(x => x.Item2).ToList(),
				FunctionCount = DeclaredFunctions.Count,
				TotalFileSize = fileSize,
				TotalFileCount = fileCount
			};

			using (var stream = File.Create(Path.Combine(outputDirectory, "report.html")))
				htmlWriter.WriteReportToFile(stream);
		}
	}
}