/*
 * Created by SharpDevelop.
 * User: Scrangos
 * Date: 6/26/2015
 * Time: 3:34 PM
 *
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.IO;

namespace RF4TextPackUnpacker
{
	class Program
	{
		public static void Main(string[] args)
		{
			Console.WriteLine("Hello World!");
			//open incoming file


			byte[] readBytes = new byte[4];
			int dum = args.Length;
			//Console.WriteLine(dum);
			//check if its .eng/jpn or if its an unpacked file
			if(dum!=0){
				var infile = new FileStream(args[0], FileMode.Open, FileAccess.Read);
				dum = infile.Read(readBytes,0,4);
			    int fileType = BitConverter.ToInt32(readBytes,0);

				//unpack
			    if(fileType==1415071060){

					//make output file
					var outfile = new FileStream(args[0]+".txt",FileMode.Create,FileAccess.ReadWrite);
					dum = infile.Read(readBytes,0,4);
					int numEntries = BitConverter.ToInt32(readBytes,0);

					//read index
					int[] fileIndex = new int[numEntries*2];
					for (int i = 0; i < numEntries*2; i++) {
						dum = infile.Read(readBytes,0,4);
						fileIndex[i] = BitConverter.ToInt32(readBytes,0);
					}

					//read and write data
					for (int i = 0; i < numEntries*2; i++) {
						int currByte = 0;
						infile.Seek(fileIndex[i+1],SeekOrigin.Begin);
						for (int j = 0; j < fileIndex[i]; j++) {
							currByte = infile.ReadByte();
							//check for newlines and convert to FF
							if(currByte==10){
								outfile.WriteByte(255);
							}
							else{
								outfile.WriteByte((byte)currByte);
							}
						}
						outfile.WriteByte(10);
						i++;
						//Console.WriteLine(dum);
					}

					outfile.Flush();
					outfile.Dispose();

			    }
				else{ //repack
					var outfile = new FileStream(args[0].Substring(0,args[0].Length-7)+"jpn",FileMode.Create,FileAccess.ReadWrite);
			    	int entrySize = 0;
			    	int numEntries = 0;
			    	int currByte = 0;
			    	//Console.WriteLine(dum);
			    	//check num of entries
			    	infile.Seek(0,SeekOrigin.Begin);
			    	while(infile.Position!=infile.Length){
			    		currByte = infile.ReadByte();
			    		if(currByte==10){
			    			numEntries++;
			    		}
			    	}
			    	//check size of entries
			    	int[] fileIndex = new int[numEntries*2];
			    	int currEntry = 0;
			    	infile.Seek(0,SeekOrigin.Begin);
			    	currByte = infile.ReadByte();
			    	entrySize++;
			    	for (int i = 0; i < numEntries*2; i++) {
			    		currByte = infile.ReadByte();
			    		while(currByte!=10){
			    			entrySize++;
			    			currByte = infile.ReadByte();
			    		}
			    		fileIndex[currEntry]=entrySize;
			    		currEntry=currEntry+2;
			    		//Console.WriteLine(entrySize);
			    		entrySize=0;
			    		i++;
			    	}
			    	//Console.WriteLine(numEntries);
			    	//calculate address locations for each entry
			    	int endOfIndex = numEntries*8+8;
			    	for (int i = 0; i < numEntries*2; i++) {
			    		fileIndex[i+1]=endOfIndex;
			    		endOfIndex = endOfIndex + fileIndex[i]+1;
			    		i++;
			    	}
//			    	for (int i = 0; i < numEntries; i++) {
//			    		Console.WriteLine(fileIndex[i]);
//			    	}
			    	//write Data
			    	//write header
			    	infile.Seek(0,SeekOrigin.Begin);
			    	outfile.WriteByte(84);
			    	outfile.WriteByte(69);
			    	outfile.WriteByte(88);
			    	outfile.WriteByte(84);
			    	readBytes = BitConverter.GetBytes(numEntries);
			    	outfile.Write(readBytes,0,4);
			    	//Console.WriteLine(outfile.Position);
			    	//write index
			    	for (int i = 0; i < numEntries*2; i++) {
			    		readBytes = BitConverter.GetBytes(fileIndex[i]);
			    		outfile.Write(readBytes,0,4);
			    		readBytes = BitConverter.GetBytes(fileIndex[i+1]);
			    		outfile.Write(readBytes,0,4);
			    		i++;
			    	}
			    	//write entry text
			    	for (int i = 0; i < numEntries*2; i++) {
			    		outfile.Seek(fileIndex[i+1],SeekOrigin.Begin);
			    		//Console.WriteLine(fileIndex[i]);
			    		for (int j = 0; j < fileIndex[i]; j++) {
			    			//outfile.WriteByte((byte)infile.ReadByte());
			    			currByte = infile.ReadByte();
			    			if(currByte==255){
			    				outfile.WriteByte(10);
			    			}
			    			else{
			    				outfile.WriteByte((byte)currByte);
			    			}
			    		}
			    		outfile.WriteByte(0);
			    		dum = infile.ReadByte();
			    		i++;
			    	}
				    outfile.Flush();
					outfile.Dispose();

				    }


			    infile.Dispose();
			   // Console.Write("Press any key to continue . . . ");
				//Console.ReadKey(true);

			    }




		}
	}
}