/*
 [The "BSD license"]
  Copyright (c) 2011 Terence Parr
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  3. The name of the author may not be used to endorse or promote products
     derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import org.antlr.v4.runtime.ANTLRFileStream;
import org.antlr.v4.runtime.BailErrorStrategy;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.DiagnosticErrorListener;
import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.atn.LexerATNSimulator;
import org.antlr.v4.runtime.atn.ParserATNSimulator;
import org.antlr.v4.runtime.atn.PredictionMode;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

class TestJavaLR {
//	public static long lexerTime = 0;
	public static boolean profile = false;
	public static boolean notree = false;
	public static boolean gui = false;
	public static boolean printTree = false;
	public static boolean SLL = false;
	public static boolean diag = false;
	public static boolean bail = false;
	public static boolean x2 = false;
	public static boolean threaded = false;
	public static boolean quiet = false;
//	public static long parserStart;
//	public static long parserStop;
	public static Worker[] workers = new Worker[3];
	static int windex = 0;

	public static CyclicBarrier barrier;

	public static volatile boolean firstPassDone = false;

	public static class Worker implements Runnable {
		public long parserStart;
		public long parserStop;
		List<String> files;
		public Worker(List<String> files) {
			this.files = files;
		}
		@Override
		public void run() {
			parserStart = System.currentTimeMillis();
			for (String f : files) {
				parseFile(f);
			}
			parserStop = System.currentTimeMillis();
			try {
				barrier.await();
			}
			catch (InterruptedException ex) {
				return;
			}
			catch (BrokenBarrierException ex) {
				return;
			}
		}
	}

	public static void main(String[] args) {
		doAll(args);
	}

	public static void doAll(String[] args) {
		List<String> inputFiles = new ArrayList<String>();
		long start = System.currentTimeMillis();
		try {
			if (args.length > 0 ) {
				// for each directory/file specified on the command line
				for(int i=0; i< args.length;i++) {
					if ( args[i].equals("-notree") ) notree = true;
					else if ( args[i].equals("-gui") ) gui = true;
					else if ( args[i].equals("-ptree") ) printTree = true;
					else if ( args[i].equals("-SLL") ) SLL = true;
					else if ( args[i].equals("-bail") ) bail = true;
					else if ( args[i].equals("-diag") ) diag = true;
					else if ( args[i].equals("-2x") ) x2 = true;
					else if ( args[i].equals("-threaded") ) threaded = true;
					else if ( args[i].equals("-quiet") ) quiet = true;
					if ( args[i].charAt(0)!='-' ) { // input file name
						inputFiles.add(args[i]);
					}
				}
				List<String> javaFiles = new ArrayList<String>();
				for (String fileName : inputFiles) {
					List<String> files = getFilenames(new File(fileName));
					javaFiles.addAll(files);
				}
				doFiles(javaFiles);

//				DOTGenerator gen = new DOTGenerator(null);
//				String dot = gen.getDOT(JavaLRParser._decisionToDFA[112], false);
//				System.out.println(dot);
//				dot = gen.getDOT(JavaLRParser._decisionToDFA[81], false);
//				System.out.println(dot);

				if ( x2 ) {
					System.gc();
					System.out.println("waiting for 1st pass");
					if ( threaded ) while ( !firstPassDone ) { } // spin
					System.out.println("2nd pass");
					doFiles(javaFiles);
				}
			}
			else {
				System.err.println("Usage: java Main <directory or file name>");
			}
		}
		catch(Exception e) {
			System.err.println("exception: "+e);
			e.printStackTrace(System.err);   // so we can get stack trace
		}
		long stop = System.currentTimeMillis();
//		System.out.println("Overall time " + (stop - start) + "ms.");
		System.gc();
	}

	public static void doFiles(List<String> files) throws Exception {
		long parserStart = System.currentTimeMillis();
//		lexerTime = 0;
		if ( threaded ) {
			barrier = new CyclicBarrier(3,new Runnable() {
				public void run() {
					report(); firstPassDone = true;
				}
			});
			int chunkSize = files.size() / 3;  // 10/3 = 3
			int p1 = chunkSize; // 0..3
			int p2 = 2 * chunkSize; // 4..6, then 7..10
			workers[0] = new Worker(files.subList(0,p1+1));
			workers[1] = new Worker(files.subList(p1+1,p2+1));
			workers[2] = new Worker(files.subList(p2+1,files.size()));
			new Thread(workers[0], "worker-"+windex++).start();
			new Thread(workers[1], "worker-"+windex++).start();
			new Thread(workers[2], "worker-"+windex++).start();
		}
		else {
			for (String f : files) {
				parseFile(f);
			}
			long parserStop = System.currentTimeMillis();
			System.out.println("Total lexer+parser time " + (parserStop - parserStart) + "ms.");
		}
	}

	private static void report() {
//		parserStop = System.currentTimeMillis();
//		System.out.println("Lexer total time " + lexerTime + "ms.");
		long time = 0;
		if ( workers!=null ) {
			// compute max as it's overlapped time
			for (Worker w : workers) {
				long wtime = w.parserStop - w.parserStart;
				time = Math.max(time,wtime);
				System.out.println("worker time " + wtime + "ms.");
			}
		}
		System.out.println("Total lexer+parser time " + time + "ms.");

		System.out.println("finished parsing OK");
		System.out.println(LexerATNSimulator.match_calls+" lexer match calls");
		System.out.println(ParserATNSimulator.predict_calls +" parser predict calls");
		System.out.println(ParserATNSimulator.retry_with_context +" retry_with_context after SLL conflict");
		System.out.println(ParserATNSimulator.retry_with_context_indicates_no_conflict +" retry sees no conflict");
		System.out.println(ParserATNSimulator.retry_with_context_predicts_same_alt +" retry predicts same alt as resolving conflict");
	}

	public static List<String> getFilenames(File f) throws Exception {
		List<String> files = new ArrayList<String>();
		getFilenames_(f, files);
		return files;
	}

	public static void getFilenames_(File f, List<String> files) throws Exception {
		// If this is a directory, walk each file/dir in that directory
		if (f.isDirectory()) {
			String flist[] = f.list();
			for(int i=0; i < flist.length; i++) {
				getFilenames_(new File(f, flist[i]), files);
			}
		}

		// otherwise, if this is a java file, parse it!
		else if ( ((f.getName().length()>5) &&
			f.getName().substring(f.getName().length()-5).equals(".java")) )
		{
			files.add(f.getAbsolutePath());
		}
	}

	// This method decides what action to take based on the type of
	//   file we are looking at
//	public static void doFile_(File f) throws Exception {
//		// If this is a directory, walk each file/dir in that directory
//		if (f.isDirectory()) {
//			String files[] = f.list();
//			for(int i=0; i < files.length; i++) {
//				doFile_(new File(f, files[i]));
//			}
//		}
//
//		// otherwise, if this is a java file, parse it!
//		else if ( ((f.getName().length()>5) &&
//			f.getName().substring(f.getName().length()-5).equals(".java")) )
//		{
//			System.err.println(f.getAbsolutePath());
//			parseFile(f.getAbsolutePath());
//		}
//	}

	public static void parseFile(String f) {
		try {
			if ( !quiet ) System.err.println(f);
			// Create a scanner that reads from the input stream passed to us
			Lexer lexer = new JavaLRLexer(new ANTLRFileStream(f));

			CommonTokenStream tokens = new CommonTokenStream(lexer);
//			long start = System.currentTimeMillis();
//			tokens.fill(); // load all and check time
//			long stop = System.currentTimeMillis();
//			lexerTime += stop-start;

			// Create a parser that reads from the scanner
			JavaLRParser parser = new JavaLRParser(tokens);
			if ( diag ) parser.addErrorListener(new DiagnosticErrorListener());
			if ( bail ) parser.setErrorHandler(new BailErrorStrategy());
			if ( SLL ) parser.getInterpreter().setPredictionMode(PredictionMode.SLL);

			// start parsing at the compilationUnit rule
			ParserRuleContext t = parser.compilationUnit();
			if ( notree ) parser.setBuildParseTree(false);
			if ( gui ) t.inspect(parser);
			if ( printTree ) System.out.println(t.toStringTree(parser));
		}
		catch (Exception e) {
			System.err.println("parser exception: "+e);
			e.printStackTrace();   // so we can get stack trace
		}
	}
}