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

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

		public void Compile(string outputDirectory)
		{
			var globals = new VariableDictionary
			{
				["LOCAL"] = 0,
				["LOCALS"] = "",
				["ARG"] = "",
				["ARGS"] = "",
				["GLOBAL"] = "",
				["GLOBALS"] = "",
				["NICKNAME"] = "",
				["MASTERNAME"] = "",
				["CSTR"] = "",
				["CUP"] = "",
				["CDOWN"] = "",
				["DOWNBASE"] = "",
				["TCVAR"] = "",
				["CDFLAG"] = "",
				["ITEMPRICE"] = "",
				["TRAINNAME"] = "",
				["BASENAME"] = "",
				["EQUIPNAME"] = "",
				["TEQUIPNAME"] = "",
				["STAINNAME"] = "",
				["EXNAME"] = "",
				["SOURCENAME"] = "",
				["FLAGNAME"] = "",
				["TFLAGNAME"] = "",
				["CFLAGNAME"] = "",
				["TCVARNAME"] = "",
				["STRNAME"] = "",
				["TSTRNAME"] = "",
				["CSTRNAME"] = "",
				["SAVESTRNAME"] = "",
				["CDFLAGNAME"] = "",
				["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"] = "",
				["RANDDATA"] = "",
				["LINECOUNT"] = "",
				["ISTIMEOUT"] = "",
				["__INT_MAX__"] = "",
				["__INT_MIN__"] = "",
				["NAME"] = "",
				["CALLNAME"] = "",
				["RAND"] = "",
				["CHARANUM"] = "",
				["TALENT"] = "",
				["FLAG"] = "",
				["TFLAG"] = "",
				["CFLAG"] = "",
				["MASTER"] = "",
				["BASE"] = "",
				["MAXBASE"] = "",
				["SOURCE"] = "",
				["ABL"] = "",
				["PALAM"] = "",
				["TEQUIP"] = "",
				["EQUIP"] = "",
				["DAY"] = "",
				["MARK"] = "",
				["PALAMLV"] = "",
				["TARGET"] = "",
				["PLAYER"] = "",
				["NOWEX"] = "",
				["EX"] = "",
				["EXNAME"] = "",
				["STAIN"] = "",
				["EXP"] = "",
				["ASSIPLAY"] = "",
				["ASSI"] = "",
				["ITEM"] = "",
				["EXPLV"] = "",
				["TIME"] = "",
				["MONEY"] = "",
				["SELECTCOM"] = "",
				["JUEL"] = "",
				["STR"] = "",
				["PREVCOM"] = "",
				["SAVESTR"] = "",
				["ABLNAME"] = "",
				["MARKNAME"] = "",
				["TALENTNAME"] = "",
				["ITEMNAME"] = "",
				["PALAMNAME"] = "",
				["EXPNAME"] = "",
				["DITEMTYPE"] = "",
				["NO"] = "",
				["RELATION"] = "",
				["IS"] = ""
			};

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

			var funcs = new List<FunctionDefinition>
			{
				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("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("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("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()),
			};

			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);

					lock (Errors)
						Errors.AddRange(localErrors.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(),
				FunctionCount = DeclaredFunctions.Count,
				TotalFileSize = fileSize,
				TotalFileCount = fileCount
			};

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