/*******************************************************************************
 * Copyright (c) 2006, 2008 Wind River Systems, Inc. and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Markus Schorn - initial API and implementation
 *    Sergey Prigogin (Google)
 *******************************************************************************/ 

package org.eclipse.cdt.internal.core.pdom.indexer;

import java.text.NumberFormat;
import java.util.Calendar;

import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.dom.ILinkage;
import org.eclipse.cdt.core.dom.IPDOMIndexer;
import org.eclipse.cdt.core.dom.IPDOMIndexerTask;
import org.eclipse.cdt.core.model.AbstractLanguage;
import org.eclipse.cdt.core.model.ICProject;
import org.eclipse.cdt.core.model.ILanguage;
import org.eclipse.cdt.core.model.ITranslationUnit;
import org.eclipse.cdt.core.model.LanguageManager;
import org.eclipse.cdt.core.parser.IScannerInfo;
import org.eclipse.cdt.core.parser.IScannerInfoProvider;
import org.eclipse.cdt.core.parser.ScannerInfo;
import org.eclipse.cdt.internal.core.index.IWritableIndex;
import org.eclipse.cdt.internal.core.index.IWritableIndexManager;
import org.eclipse.cdt.internal.core.pdom.AbstractIndexerTask;
import org.eclipse.cdt.internal.core.pdom.ITodoTaskUpdater;
import org.eclipse.cdt.internal.core.pdom.IndexerProgress;
import org.eclipse.cdt.internal.core.pdom.db.ChunkCache;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.osgi.util.NLS;

/**
 * Configures the abstract indexer task suitable for indexing projects.
 */
public abstract class PDOMIndexerTask extends AbstractIndexerTask implements IPDOMIndexerTask {
	private static final String TRUE = "true"; //$NON-NLS-1$
	
	private AbstractPDOMIndexer fIndexer;
	private boolean fWriteInfoToLog;
	
	protected PDOMIndexerTask(ITranslationUnit[] addFiles, ITranslationUnit[] updateFiles, ITranslationUnit[] removeFiles, 
			AbstractPDOMIndexer indexer, boolean isFastIndexer) {
		super(concat(addFiles, updateFiles), removeFiles, new ProjectIndexerInputAdapter(indexer.getProject()), isFastIndexer);
		fIndexer= indexer;
		setShowActivity(checkDebugOption(TRACE_ACTIVITY, TRUE));
		setShowInclusionProblems(checkDebugOption(TRACE_INCLUSION_PROBLEMS, TRUE));
		setShowScannerProblems(checkDebugOption(TRACE_SCANNER_PROBLEMS, TRUE));
		setShowSyntaxProblems(checkDebugOption(TRACE_SYNTAX_PROBLEMS, TRUE));
		setShowProblems(checkDebugOption(TRACE_PROBLEMS, TRUE));
		if (checkProperty(IndexerPreferences.KEY_SKIP_ALL_REFERENCES)) {
			setSkipReferences(SKIP_ALL_REFERENCES);
		}
		else if (checkProperty(IndexerPreferences.KEY_SKIP_TYPE_REFERENCES)) {
			setSkipReferences(SKIP_TYPE_REFERENCES);
		}
		if (getIndexAllFiles()) {
			setIndexFilesWithoutBuildConfiguration(true);
			setIndexHeadersWithoutContext(true);
		}
		else {
			setIndexFilesWithoutBuildConfiguration(false);
			setIndexHeadersWithoutContext(false);
		}
	}
	
	private static ITranslationUnit[] concat(ITranslationUnit[] added, ITranslationUnit[] changed) {
		ITranslationUnit[] result= new ITranslationUnit[added.length+changed.length];
		System.arraycopy(added, 0, result, 0, added.length);
		System.arraycopy(changed, 0, result, added.length, changed.length);
		return result;
	}
	
	public final void setParseUpFront() {
		setParseUpFront(fIndexer.getFilesToParseUpFront());
	}


	public final IPDOMIndexer getIndexer() {
		return fIndexer;
	}
	
	public final void run(IProgressMonitor monitor) throws InterruptedException {
		long start = System.currentTimeMillis();
		runTask(monitor);
		traceEnd(start, fIndex, monitor.isCanceled());
	}
	
	/**
	 * Checks whether a given debug option is enabled. See {@link IPDOMIndexerTask}
	 * for valid values.
	 * @since 4.0
	 */
	public static boolean checkDebugOption(String option, String value) {
		String trace= Platform.getDebugOption(option); 
		boolean internallyActivated= Boolean.getBoolean(option);
		return internallyActivated || (trace != null && trace.equalsIgnoreCase(value));
	}

	private boolean getIndexAllFiles() {
		return checkProperty(IndexerPreferences.KEY_INDEX_ALL_FILES);
	}

	private boolean checkProperty(String key) {
		return TRUE.equals(getIndexer().getProperty(key));
	}

	
	@Override
	protected String getASTPathForParsingUpFront() {
		final IProject project = getProject().getProject();
		final IPath prjLocation= project.getLocation();
		if (prjLocation == null) {
			return null;
		}
		return prjLocation.append(super.getASTPathForParsingUpFront()).toString(); 
	}

	@Override
	protected AbstractLanguage[] getLanguages(String filename) {
		IContentType ct= CCorePlugin.getContentType(getProject().getProject(), filename);
		if (ct != null) {
			ILanguage l = LanguageManager.getInstance().getLanguage(ct);
			if (l instanceof AbstractLanguage) {
				if (ct.getId().equals(CCorePlugin.CONTENT_TYPE_CXXHEADER) && l.getLinkageID() == ILinkage.CPP_LINKAGE_ID) {
					ILanguage l2= LanguageManager.getInstance().getLanguageForContentTypeID(CCorePlugin.CONTENT_TYPE_CHEADER);
					if (l2 instanceof AbstractLanguage) {
						return new AbstractLanguage[] {(AbstractLanguage) l, (AbstractLanguage) l2};
					}
				}
				return new AbstractLanguage[] {(AbstractLanguage) l};
			}
		}
		return new AbstractLanguage[0];
	}

	@Override
	protected IScannerInfo createDefaultScannerConfig(int linkageID) {
		IProject project= getProject().getProject();
		IScannerInfoProvider provider= CCorePlugin.getDefault().getScannerInfoProvider(project);
		IScannerInfo scanInfo;
		if (provider != null) { 
			String filename= linkageID == ILinkage.C_LINKAGE_ID ? "__cdt__.c" : "__cdt__.cpp";  //$NON-NLS-1$//$NON-NLS-2$
			IFile file= project.getFile(filename);
			scanInfo= provider.getScannerInformation(file);
			if (scanInfo == null || scanInfo.getDefinedSymbols().isEmpty()) {
				scanInfo= provider.getScannerInformation(project);
			}
		}
		else {
			scanInfo= new ScannerInfo();
		}
		return scanInfo;
	}

	private ICProject getProject() {
		return getIndexer().getProject();
	}

	@Override
	protected final IWritableIndex createIndex() {
		try {
			return ((IWritableIndexManager) CCorePlugin.getIndexManager()).getWritableIndex(getProject());
		} catch (CoreException e) {
			CCorePlugin.log(e);
		}
		return null;
	}

	@Override
	protected final ITodoTaskUpdater createTodoTaskUpdater() {
		return new TodoTaskUpdater();
	}
	
	protected void traceEnd(long start, IWritableIndex index, boolean wasCancelled) {
		// log entry
		if (fWriteInfoToLog && !wasCancelled && index != null) {
			final long totalTime = System.currentTimeMillis() - start;
			final IndexerProgress info= getProgressInformation();
			final int sum= fStatistics.fDeclarationCount+fStatistics.fReferenceCount+fStatistics.fProblemBindingCount;
			final double problemPct= sum==0 ? 0.0 : (double) fStatistics.fProblemBindingCount / (double) sum;
			NumberFormat nfGroup= NumberFormat.getNumberInstance();
			nfGroup.setGroupingUsed(true);
			NumberFormat nfPercent= NumberFormat.getPercentInstance();
			nfPercent.setMaximumFractionDigits(2);
			nfPercent.setMinimumFractionDigits(2);
			NumberFormat nfTime= NumberFormat.getNumberInstance();
			nfTime.setMaximumFractionDigits(2);
			nfTime.setMinimumFractionDigits(2);
			nfTime.setGroupingUsed(true);
			final String msg= NLS.bind(Messages.PDOMIndexerTask_indexerInfo,
					new Object[] {
						getCProject().getElementName(), 
						nfGroup.format(info.fCompletedSources), 
						nfGroup.format(info.fCompletedHeaders),
						nfTime.format((double) totalTime/1000),
						nfGroup.format(fStatistics.fDeclarationCount), 
						nfGroup.format(fStatistics.fReferenceCount),
						nfGroup.format(fStatistics.fUnresolvedIncludesCount),
						nfGroup.format(fStatistics.fPreprocessorProblemCount + fStatistics.fSyntaxProblemsCount),
						nfGroup.format(fStatistics.fProblemBindingCount),
						nfPercent.format(problemPct)
					}
			);
			CCorePlugin.getDefault().getLog().log(new Status(IStatus.INFO, CCorePlugin.PLUGIN_ID, msg));
		}
		
		// tracing
		if (checkDebugOption(IPDOMIndexerTask.TRACE_STATISTICS, TRUE)) {
			String ident= "   ";   //$NON-NLS-1$
			final long totalTime = System.currentTimeMillis() - start;
			final IndexerProgress info= getProgressInformation();
			final int sum= fStatistics.fDeclarationCount+fStatistics.fReferenceCount+fStatistics.fProblemBindingCount;
			final double problemPct= sum==0 ? 0.0 : (double) fStatistics.fProblemBindingCount / (double) sum;
			String kind= getIndexer().getClass().getName();
			kind= kind.substring(kind.lastIndexOf('.')+1);
			final long dbSize= index.getDatabaseSizeBytes();
			
			System.out.println("C/C++ Indexer: Project '" + getProject().getElementName()     //$NON-NLS-1$
					+ "' (" + info.fCompletedSources + " sources, "      //$NON-NLS-1$//$NON-NLS-2$
					+ info.fCompletedHeaders + " headers)");    //$NON-NLS-1$
			boolean allFiles= getIndexAllFiles();
			boolean skipRefs= checkProperty(IndexerPreferences.KEY_SKIP_ALL_REFERENCES);
			boolean skipTypeRefs= skipRefs || checkProperty(IndexerPreferences.KEY_SKIP_TYPE_REFERENCES);
			System.out.println(ident + " Options: "     //$NON-NLS-1$
					+ "indexer='" + kind    //$NON-NLS-1$
					+ "', parseAllFiles=" + allFiles    //$NON-NLS-1$
					+ ", skipReferences=" + skipRefs    //$NON-NLS-1$
					+ ", skipTypeReferences=" + skipTypeRefs    //$NON-NLS-1$
					+ ".");    //$NON-NLS-1$
			System.out.println(ident + " Database: " + dbSize + " bytes");   //$NON-NLS-1$ //$NON-NLS-2$
			System.out.println(ident + " Timings: "     //$NON-NLS-1$
					+ totalTime + " total, "    //$NON-NLS-1$
					+ fStatistics.fParsingTime + " parser, "    //$NON-NLS-1$
					+ fStatistics.fResolutionTime + " resolution, "    //$NON-NLS-1$
					+ fStatistics.fAddToIndexTime + " index update.");    //$NON-NLS-1$
			System.out.println(ident + " Errors: "    //$NON-NLS-1$
					+ fStatistics.fErrorCount + " internal, "    //$NON-NLS-1$
					+ fStatistics.fUnresolvedIncludesCount + " include, "     //$NON-NLS-1$
					+ fStatistics.fPreprocessorProblemCount + " scanner, "     //$NON-NLS-1$
					+ fStatistics.fSyntaxProblemsCount + " syntax errors.");    //$NON-NLS-1$

			NumberFormat nfPercent= NumberFormat.getPercentInstance();
			nfPercent.setMaximumFractionDigits(2);
			nfPercent.setMinimumFractionDigits(2);
			System.out.println(ident + " Names: "    //$NON-NLS-1$
					+ fStatistics.fDeclarationCount + " declarations, "    //$NON-NLS-1$
					+ fStatistics.fReferenceCount + " references, "    //$NON-NLS-1$
					+ fStatistics.fProblemBindingCount + "(" + nfPercent.format(problemPct) + ") unresolved.");     //$NON-NLS-1$ //$NON-NLS-2$
			
			if (index != null) {
				long misses= index.getCacheMisses();
				long hits= index.getCacheHits();
				long tries= misses+hits;
				double missPct= tries==0 ? 0.0 : (double) misses / (double) tries;
				System.out.println(ident + " Cache["    //$NON-NLS-1$
					+ ChunkCache.getSharedInstance().getMaxSize() / 1024 / 1024 + "mb]: " +    //$NON-NLS-1$
					+ hits + " hits, "      //$NON-NLS-1$
					+ misses + "(" + nfPercent.format(missPct)+ ") misses.");      //$NON-NLS-1$ //$NON-NLS-2$
			
				if ("true".equals(System.getProperty("SHOW_COMPRESSED_INDEXER_INFO"))) {    //$NON-NLS-1$ //$NON-NLS-2$
					Calendar cal = Calendar.getInstance();
					NumberFormat twoDigits= NumberFormat.getNumberInstance();
					twoDigits.setMinimumIntegerDigits(2);
					NumberFormat nfGroup= NumberFormat.getNumberInstance();
					nfGroup.setGroupingUsed(true);

					final String sep0 = "|"; //$NON-NLS-1$
					final String sep = "|  "; //$NON-NLS-1$
					final String sec = "s"; //$NON-NLS-1$
					final String mb = "mb"; //$NON-NLS-1$
					final String million = "M"; //$NON-NLS-1$
					System.out.print(sep0);   
					System.out.print(cal.get(Calendar.YEAR) + twoDigits.format(cal.get(Calendar.MONTH)+1) + twoDigits.format(cal.get(Calendar.DAY_OF_MONTH)+1));
					System.out.print(sep);   
					System.out.print(nfGroup.format(info.fCompletedSources));
					System.out.print(sep);   
					System.out.print(nfGroup.format(info.fCompletedHeaders));
					System.out.print(sep);   
					System.out.print(nfGroup.format((totalTime+500)/1000) + sec);   
					System.out.print(sep);   
					System.out.print(nfGroup.format((fStatistics.fParsingTime+500)/1000) + sec);   
					System.out.print(sep);    
					System.out.print(nfGroup.format((fStatistics.fResolutionTime+500)/1000) + sec);   
					System.out.print(sep);   
					System.out.print(nfGroup.format((fStatistics.fAddToIndexTime+500)/1000) + sec);   
					System.out.print(sep);   
					System.out.print(nfGroup.format((dbSize+1024*512)/1024/1024) + mb);   
					System.out.print(sep);   
					System.out.print(nfGroup.format((tries+1000*500)/1000000) + million);   
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fDeclarationCount));  
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fReferenceCount));  
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fProblemBindingCount));  
					System.out.print(sep);   
					System.out.print(nfPercent.format(problemPct));   
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fErrorCount));  
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fUnresolvedIncludesCount));  
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fPreprocessorProblemCount));  
					System.out.print(sep);   
					System.out.print(nfGroup.format(fStatistics.fSyntaxProblemsCount));  
					System.out.println(sep0);   
				}
			}
		}
	}

	protected ICProject getCProject() {
		return fIndexer.project;
	}

	public void setWriteInfoToLog() {
		fWriteInfoToLog= true;
	}
}