package jgi;

import java.io.File;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Locale;

import fileIO.ByteFile;
import fileIO.ByteFile1;
import fileIO.ByteFile2;
import fileIO.ByteStreamWriter;
import fileIO.FileFormat;
import fileIO.ReadWrite;
import shared.Parser;
import shared.Shared;
import shared.Timer;
import shared.Tools;
import stream.ByteBuilder;
import stream.ConcurrentGenericReadInputStream;
import stream.FastaReadInputStream;

/**
 * @author Brian Bushnell
 * @date March 8, 2017
 *
 */
public class MergeSam {
	
	public static void main(String[] args){
		Timer t=new Timer();
		MergeSam sample=new MergeSam(args);
		sample.process(t);
	}
	
	public MergeSam(String[] args){
		
		args=Parser.parseConfig(args);
		if(Parser.parseHelp(args, true)){
			printOptions();
			System.exit(0);
		}
		
		outstream.println("Executing "+getClass().getName()+" "+Arrays.toString(args)+"\n");
		
		ReadWrite.USE_PIGZ=ReadWrite.USE_UNPIGZ=true;
		ReadWrite.MAX_ZIP_THREADS=Shared.threads();
		
		Parser parser=new Parser();
		for(int i=0; i<args.length; i++){
			String arg=args[i];
			String[] split=arg.split("=");
			String a=split[0].toLowerCase();
			String b=split.length>1 ? split[1] : null;
			if(b==null || b.equalsIgnoreCase("null")){b=null;}
			while(a.startsWith("-")){a=a.substring(1);} //In case people use hyphens

			if(a.equals("invalid")){
				outInvalid=b;
			}else if(a.equals("lines")){
				maxLines=Long.parseLong(b);
				if(maxLines<0){maxLines=Long.MAX_VALUE;}
			}else if(a.equals("verbose")){
				verbose=Tools.parseBoolean(b);
				ByteFile1.verbose=verbose;
				ByteFile2.verbose=verbose;
				stream.FastaReadInputStream.verbose=verbose;
				ConcurrentGenericReadInputStream.verbose=verbose;
				stream.FastqReadInputStream.verbose=verbose;
				ReadWrite.verbose=verbose;
			}else if(a.equals("in")){
				in.add(b);
			}else if(a.equals("out")){
				out=b;
			}else if(b==null && new File(arg).exists()){
				in.add(arg);
			}else if(parser.parse(arg, a, b)){//Parse standard flags in the parser
				//do nothing
			}else{
				outstream.println("Unknown parameter "+args[i]);
				assert(false) : "Unknown parameter "+args[i];
				//				throw new RuntimeException("Unknown parameter "+args[i]);
			}
		}
		
		{//Process parser fields
			overwrite=parser.overwrite;
			append=parser.append;
		}
		
		assert(FastaReadInputStream.settingsOK());
		
		if(in==null){
			printOptions();
			throw new RuntimeException("Error - at least one input file is required.");
		}

		if(out!=null && out.equalsIgnoreCase("null")){out=null;}
		
		if(!Tools.testOutputFiles(overwrite, append, false, out)){
			outstream.println((out==null)+", "+out);
			throw new RuntimeException("\n\noverwrite="+overwrite+"; Can't write to output files "+out+"\n");
		}

		ffout=FileFormat.testOutput(out, FileFormat.SAM, null, true, overwrite, append, false);
		ffoutInvalid=FileFormat.testOutput(outInvalid, FileFormat.SAM, null, true, overwrite, append, false);
		ffin=FileFormat.testInputList(in, FileFormat.SAM, null, true, true);
	}
	
	void process(Timer t){
		
		ByteStreamWriter bsw=null;
		if(ffout!=null){
			bsw=new ByteStreamWriter(ffout);
			bsw.start();
		}
		
		ByteStreamWriter bswInvalid=null;
		if(ffoutInvalid!=null){
			bswInvalid=new ByteStreamWriter(ffoutInvalid);
			bswInvalid.start();
		}

		boolean headerMode=true;
		for(int fnum=0; fnum<ffin.length; fnum++){

			ByteFile bf=ByteFile.makeByteFile(ffin[fnum]);
			
			byte[] line=bf.nextLine();
			
			while(line!=null){
				if(line.length>0){
					if(maxLines>0 && linesProcessed>=maxLines){break;}
					linesProcessed++;
					bytesProcessed+=line.length;
					
					boolean valid=true;
					if(line[0]=='@'){valid=headerMode;}
					else{headerMode=false;}

					if(valid){
						linesValid++;
						if(bsw!=null){
							bsw.println(line);
						}
					}else{
						if(bswInvalid!=null){
							bswInvalid.println(line);
						}
					}
				}
				line=bf.nextLine();
			}

			errorState|=bf.close();
		}
		
		if(bsw!=null){errorState|=bsw.poisonAndWait();}
		if(bswInvalid!=null){errorState|=bswInvalid.poisonAndWait();}
		
		t.stop();
		
		double rpnano=linesProcessed/(double)(t.elapsed);
		double bpnano=bytesProcessed/(double)(t.elapsed);

		String rpstring=(linesProcessed<100000 ? ""+linesProcessed : linesProcessed<100000000 ? (linesProcessed/1000)+"k" : (linesProcessed/1000000)+"m");
		String bpstring=(bytesProcessed<100000 ? ""+bytesProcessed : bytesProcessed<100000000 ? (bytesProcessed/1000)+"k" : (bytesProcessed/1000000)+"m");

		while(rpstring.length()<8){rpstring=" "+rpstring;}
		while(bpstring.length()<8){bpstring=" "+bpstring;}
		
		outstream.println("Time:                         \t"+t);
		outstream.println("Lines Processed:    "+rpstring+" \t"+String.format(Locale.ROOT, "%.2fk lines/sec", rpnano*1000000));
		outstream.println("Bytes Processed:    "+bpstring+" \t"+String.format(Locale.ROOT, "%.2fm bytes/sec", bpnano*1000));
		
		outstream.println();
		outstream.println("Valid Lines:       \t"+linesValid);
		outstream.println("Invalid Lines:     \t"+(linesProcessed-linesValid));
		
		if(errorState){
			throw new RuntimeException(getClass().getName()+" terminated in an error state; the output may be corrupt.");
		}
	}
	
	/*--------------------------------------------------------------*/
	
	/** This is called if the program runs with no parameters */
	private void printOptions(){assert(false) : "Please read the associated shell script for usage information.";}
	
	/*--------------------------------------------------------------*/
	
	private ArrayList<String> in=new ArrayList<String>();
	private String out="stdout.sam";
	private String outInvalid=null;
	
	/*--------------------------------------------------------------*/
	
	private long linesProcessed=0;
	private long linesValid=0;
	private long bytesProcessed=0;
	
	private long maxLines=Long.MAX_VALUE;
	
	/*--------------------------------------------------------------*/
	
	private final FileFormat[] ffin;
	private final FileFormat ffout;
	private final FileFormat ffoutInvalid;
	
	
	/*--------------------------------------------------------------*/
	
	private PrintStream outstream=System.err;
	public static boolean verbose=false;
	public boolean errorState=false;
	private boolean overwrite=false;
	private boolean append=false;
	
}
