package prok;

import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Locale;

import fileIO.ByteFile;
import fileIO.ByteFile1;
import fileIO.ByteFile2;
import fileIO.FileFormat;
import fileIO.ReadWrite;
import shared.Parser;
import shared.PreParser;
import shared.Shared;
import shared.Timer;
import shared.Tools;

/**
 * Compares gff files for the purpose of grading gene-calling.
 * @author Brian Bushnell
 * @date October 3, 2018
 *
 */
public class CompareGff {
	
	/*--------------------------------------------------------------*/
	/*----------------        Initialization        ----------------*/
	/*--------------------------------------------------------------*/
	
	/**
	 * Code entrance from the command line.
	 * @param args Command line arguments
	 */
	public static void main(String[] args){
		//Start a timer immediately upon code entrance.
		Timer t=new Timer();
		
		//Create an instance of this class
		CompareGff x=new CompareGff(args);
		
		//Run the object
		x.process(t);
		
		//Close the print stream if it was redirected
		Shared.closeStream(x.outstream);
	}
	
	/**
	 * Constructor.
	 * @param args Command line arguments
	 */
	public CompareGff(String[] args){
		
		{//Preparse block for help, config files, and outstream
			PreParser pp=new PreParser(args, getClass(), false);
			args=pp.args;
			outstream=pp.outstream;
		}
		
		//Set shared static variables prior to parsing
		ReadWrite.USE_PIGZ=ReadWrite.USE_UNPIGZ=true;
		ReadWrite.MAX_ZIP_THREADS=Shared.threads();
		
		{//Parse the arguments
			final Parser parser=parse(args);
			overwrite=parser.overwrite;
			append=parser.append;
			
			in=parser.in1;
		}
		
		fixExtensions(); //Add or remove .gz or .bz2 as needed
		checkFileExistence(); //Ensure files can be read and written
		checkStatics(); //Adjust file-related static fields as needed for this program

		ffin=FileFormat.testInput(in, FileFormat.GFF, null, true, true);
		ffref=FileFormat.testInput(ref, FileFormat.GFF, null, true, true);
	}
	
	/*--------------------------------------------------------------*/
	/*----------------    Initialization Helpers    ----------------*/
	/*--------------------------------------------------------------*/
	
	/** Parse arguments from the command line */
	private Parser parse(String[] args){
		
		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;}

			if(a.equals("ref")){
				ref=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;
				ReadWrite.verbose=verbose;
			}else if(parser.parse(arg, a, b)){
				//do nothing
			}else if(i==0 && arg.indexOf('=')<0){
				parser.in1=arg;
			}else if(i==1 && arg.indexOf('=')<0 && ref==null){
				ref=arg;
			}else{
				outstream.println("Unknown parameter "+args[i]);
				assert(false) : "Unknown parameter "+args[i];
				//				throw new RuntimeException("Unknown parameter "+args[i]);
			}
		}
		
		return parser;
	}
	
	/** Add or remove .gz or .bz2 as needed */
	private void fixExtensions(){
		in=Tools.fixExtension(in);
		ref=Tools.fixExtension(ref);
		if(in==null || ref==null){throw new RuntimeException("Error - at least two input files are required.");}
	}
	
	/** Ensure files can be read and written */
	private void checkFileExistence(){
		
		//Ensure input files can be read
		if(!Tools.testInputFiles(true, true, in, ref)){
			throw new RuntimeException("\nCan't read some input files.\n");  
		}
	}
	
	/** Adjust file-related static fields as needed for this program */
	private static void checkStatics(){
		//Adjust the number of threads for input file reading
		if(!ByteFile.FORCE_MODE_BF1 && !ByteFile.FORCE_MODE_BF2 && Shared.threads()>2){
			ByteFile.FORCE_MODE_BF2=true;
		}
		
//		if(!ByteFile.FORCE_MODE_BF2){
//			ByteFile.FORCE_MODE_BF2=false;
//			ByteFile.FORCE_MODE_BF1=true;
//		}
	}
	
	/*--------------------------------------------------------------*/
	/*----------------         Outer Methods        ----------------*/
	/*--------------------------------------------------------------*/
	
	void process(Timer t){
		
		ByteFile bf=ByteFile.makeByteFile(ffin);
		
		processInner(bf);
		
		errorState|=bf.close();
		
		t.stop();
		
		outstream.println(Tools.timeLinesBytesProcessed(t, linesProcessed, bytesProcessed, 8));

		outstream.println();
		outstream.println("Ref-relative counts:");
		outstream.println("True Positive Start: \t"+truePositiveStart+"\t"+(String.format(Locale.ROOT, "%.3f%%", truePositiveStart*100.0/refCount)));
		outstream.println("True Positive Stop:  \t"+truePositiveStop+"\t"+(String.format(Locale.ROOT, "%.3f%%", truePositiveStop*100.0/refCount)));
//		outstream.println("False Positive Start:\t"+falsePositiveStart+"\t"+(String.format(Locale.ROOT, "%.3f%%", falsePositiveStart*100.0/refCount)));
//		outstream.println("False Positive Stop: \t"+falsePositiveStop+"\t"+(String.format(Locale.ROOT, "%.3f%%", falsePositiveStop*100.0/refCount)));
		outstream.println("False Negative Start:\t"+falseNegativeStart+"\t"+(String.format(Locale.ROOT, "%.3f%%", falseNegativeStart*100.0/refCount)));
		outstream.println("False Negative Stop: \t"+falseNegativeStop+"\t"+(String.format(Locale.ROOT, "%.3f%%", falseNegativeStop*100.0/refCount)));

		outstream.println();
		outstream.println("Query-relative counts:");
		outstream.println("True Positive Start: \t"+truePositiveStart2+"\t"+(String.format(Locale.ROOT, "%.3f%%", truePositiveStart2*100.0/queryCount)));
		outstream.println("True Positive Stop:  \t"+truePositiveStop2+"\t"+(String.format(Locale.ROOT, "%.3f%%", truePositiveStop2*100.0/queryCount)));
		outstream.println("False Positive Start:\t"+falsePositiveStart2+"\t"+(String.format(Locale.ROOT, "%.3f%%", falsePositiveStart2*100.0/queryCount)));
		outstream.println("False Positive Stop: \t"+falsePositiveStop2+"\t"+(String.format(Locale.ROOT, "%.3f%%", falsePositiveStop2*100.0/queryCount)));
		
		outstream.println();
		outstream.println("SNR: \t"+String.format(Locale.ROOT, "%.4f", 10*Math.log10((truePositiveStart2+truePositiveStop2+0.1)/(falsePositiveStart2+falsePositiveStop2+0.1))));
		
		if(errorState){
			throw new RuntimeException(getClass().getName()+" terminated in an error state; the output may be corrupt.");
		}
	}
	
	/*--------------------------------------------------------------*/
	/*----------------         Inner Methods        ----------------*/
	/*--------------------------------------------------------------*/
	
	@SuppressWarnings("unchecked")
	private void processInner(ByteFile bf){
		byte[] line=bf.nextLine();
		
		{
			ArrayList<GffLine> refLines=GffLine.loadGffFile(ffref, "CDS");

			refCount=refLines.size();
			stopSet=new HashSet<Integer>((int)refCount);
			startSet=new HashSet<Integer>((int)refCount);
			map=new HashMap<Integer, ArrayList<GffLine>>();

			for(GffLine gline : refLines){
				final int stop=(gline.strand==1 ? gline.start : gline.stop);
				final int start=(gline.strand==1 ? gline.stop : gline.start);
				ArrayList<GffLine> temp=map.get(stop);
				if(temp==null){
					temp=new ArrayList<GffLine>();
					map.put(stop,  temp);	

					stopSet.add(stop);
					startSet.add(start);
				}
				temp.add(gline);
			}
			stopSetM=(HashSet<Integer>) stopSet.clone();
			startSetM=(HashSet<Integer>) startSet.clone();
			assert(stopSetM.containsAll(stopSet));
			assert(startSetM.containsAll(startSet));
		}

		while(line!=null){
			if(line.length>0){
				if(maxLines>0 && linesProcessed>=maxLines){break;}
				linesProcessed++;
				bytesProcessed+=(line.length+1);
				
				final boolean valid=(line[0]!='#');
				if(valid){
					queryCount++;
					GffLine gline=new GffLine(line);
					processLine(gline);
				}
			}
			line=bf.nextLine();
		}
		
		stopSetM.retainAll(stopSet);
		startSetM.retainAll(startSet);
		falseNegativeStart=startSetM.size();
		falseNegativeStop=stopSetM.size();
	}
	
	/** This currently ignores sequence names. */
	private void processLine(GffLine gline){
		if(!gline.type.equals("CDS")){return;}
		final int stop=(gline.strand==1 ? gline.start : gline.stop);
		final int start=(gline.strand==1 ? gline.stop : gline.start);
		
//		System.err.println("Considering "+start+", "+stop);
		
		if(stopSet.contains(stop)){
			truePositiveStop2++;
			if(stopSetM.contains(stop)){
				stopSetM.remove(stop);
				truePositiveStop++;
			}
		}else{
			falsePositiveStop2++;
			if(!stopSetM.contains(stop)){
				stopSetM.add(stop);
				falsePositiveStop++;
			}
		}
		
		if(startSet.contains(start)){
			truePositiveStart2++;
			if(startSetM.contains(start)){
				startSetM.remove(start);
				truePositiveStart++;
			}
		}else{
			falsePositiveStart2++;
			if(!startSetM.contains(start)){
				startSetM.add(start);
				falsePositiveStart++;
			}
		}
	}
	
	/*--------------------------------------------------------------*/
	/*----------------            Fields            ----------------*/
	/*--------------------------------------------------------------*/

	private String in=null;
	private String ref=null;
	
	/*--------------------------------------------------------------*/

	private HashMap<Integer, ArrayList<GffLine>> map;
	private HashSet<Integer> stopSet;
	private HashSet<Integer> startSet;
	private HashSet<Integer> stopSetM;
	private HashSet<Integer> startSetM;
	
	private long linesProcessed=0;
	private long linesOut=0;
	private long bytesProcessed=0;
	private long bytesOut=0;
	
	private long maxLines=Long.MAX_VALUE;

	private long falsePositiveStart=0;
	private long falsePositiveStop=0;
	private long truePositiveStart=0;
	private long truePositiveStop=0;
	private long falseNegativeStart=0;
	private long falseNegativeStop=0;
	
	private long falsePositiveStart2=0;
	private long falsePositiveStop2=0;
	private long truePositiveStart2=0;
	private long truePositiveStop2=0;
	
	private long refCount=0;
	private long queryCount=0;
	
	/*--------------------------------------------------------------*/
	/*----------------         Final Fields         ----------------*/
	/*--------------------------------------------------------------*/

	private final FileFormat ffin;
	private final FileFormat ffref;
	
	/*--------------------------------------------------------------*/
	/*----------------        Common Fields         ----------------*/
	/*--------------------------------------------------------------*/
	
	private PrintStream outstream=System.err;
	public static boolean verbose=false;
	public boolean errorState=false;
	private boolean overwrite=false;
	private boolean append=false;
	
}
