/*******************************************************************************
 * Copyright (c) 2007, 2015 IBM Corporation 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:
 *    IBM Corporation - initial API and implementation
 *    IBM Corporation - fix for 342936
 *    Kenneth Olson - Contribution for bug 188796 - [jsr199] Using JSR199 to extend ECJ
 *    Dennis Hendriks - Contribution for bug 188796 - [jsr199] Using JSR199 to extend ECJ
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.tool;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;

import javax.annotation.processing.Processor;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticListener;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;

import org.eclipse.jdt.core.compiler.CategorizedProblem;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.core.compiler.CompilationProgress;
import org.eclipse.jdt.internal.compiler.ClassFile;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.IErrorHandlingPolicy;
import org.eclipse.jdt.internal.compiler.IProblemFactory;
import org.eclipse.jdt.internal.compiler.batch.ClasspathJsr199;
import org.eclipse.jdt.internal.compiler.batch.CompilationUnit;
import org.eclipse.jdt.internal.compiler.batch.FileSystem;
import org.eclipse.jdt.internal.compiler.batch.FileSystem.Classpath;
import org.eclipse.jdt.internal.compiler.batch.Main;
import org.eclipse.jdt.internal.compiler.problem.AbortCompilationUnit;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblem;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
import org.eclipse.jdt.internal.compiler.util.Messages;
import org.eclipse.jdt.internal.compiler.util.SuffixConstants;

public class EclipseCompilerImpl extends Main {
	private static final CompilationUnit[] NO_UNITS = new CompilationUnit[0];
	private HashMap<CompilationUnit, JavaFileObject> javaFileObjectMap;
	Iterable<? extends JavaFileObject> compilationUnits;
	public JavaFileManager fileManager;
	protected Processor[] processors;
	public DiagnosticListener<? super JavaFileObject> diagnosticListener;

	public EclipseCompilerImpl(PrintWriter out, PrintWriter err, boolean systemExitWhenFinished) {
		super(out, err, systemExitWhenFinished, null/*options*/, null/*progress*/);
	}

	public boolean call() {
		try {
			if (this.proceed) {
				this.globalProblemsCount = 0;
				this.globalErrorsCount = 0;
				this.globalWarningsCount = 0;
				this.globalTasksCount = 0;
				this.exportedClassFilesCounter = 0;
				// request compilation
				performCompilation();
			}
		} catch(IllegalArgumentException e) {
			this.logger.logException(e);
			if (this.systemExitWhenFinished) {
				cleanup();
				System.exit(-1);
			}
			return false;
		} catch (RuntimeException e) { // internal compiler failure
			this.logger.logException(e);
			return false;
		} finally {
			cleanup();
		}
		if (this.globalErrorsCount == 0)
			return true;
		return false;
	}

	private void cleanup() {
		this.logger.flush();
		this.logger.close();
		this.processors = null;
		try {
			if (this.fileManager != null) {
				this.fileManager.flush();
			}
		} catch (IOException e) {
			// ignore
		}
	}

	@Override
	public CompilationUnit[] getCompilationUnits() {
		if (this.compilationUnits == null) return EclipseCompilerImpl.NO_UNITS;
		ArrayList<CompilationUnit> units = new ArrayList<>();
		for (final JavaFileObject javaFileObject : this.compilationUnits) {
			if (javaFileObject.getKind() != JavaFileObject.Kind.SOURCE) {
				throw new IllegalArgumentException();
			}
			String name = javaFileObject.getName();
			name = name.replace('\\', '/');
			CompilationUnit compilationUnit = new CompilationUnit(null,
				name,
				null) {

				@Override
				public char[] getContents() {
					try {
						return javaFileObject.getCharContent(true).toString().toCharArray();
					} catch(IOException e) {
						e.printStackTrace();
						throw new AbortCompilationUnit(null, e, null);
					}
				}
			};
			units.add(compilationUnit);
			this.javaFileObjectMap.put(compilationUnit, javaFileObject);
		}
		CompilationUnit[] result = new CompilationUnit[units.size()];
		units.toArray(result);
		return result;
	}
	/*
	 *  Low-level API performing the actual compilation
	 */
	@Override
	public IErrorHandlingPolicy getHandlingPolicy() {
		// passes the initial set of files to the batch oracle (to avoid finding more than once the same units when case insensitive match)
		return new IErrorHandlingPolicy() {
			@Override
			public boolean proceedOnErrors() {
				return false; // stop if there are some errors
			}
			@Override
			public boolean stopOnFirstError() {
				return false;
			}
			@Override
			public boolean ignoreAllErrors() {
				return false;
			}
		};
	}

	@Override
	public IProblemFactory getProblemFactory() {
		return new DefaultProblemFactory() {
			@Override
			public CategorizedProblem createProblem(
					final char[] originatingFileName,
					final int problemId,
					final String[] problemArguments,
					final String[] messageArguments,
					final int severity,
					final int startPosition,
					final int endPosition,
					final int lineNumber,
					final int columnNumber) {

				DiagnosticListener<? super JavaFileObject> diagListener = EclipseCompilerImpl.this.diagnosticListener;
				if (diagListener != null) {
					diagListener.report(new Diagnostic<JavaFileObject>() {
						@Override
						public String getCode() {
							return Integer.toString(problemId);
						}
						@Override
						public long getColumnNumber() {
							return columnNumber;
						}
						@Override
						public long getEndPosition() {
							return endPosition;
						}
						@Override
						public Kind getKind() {
							if ((severity & ProblemSeverities.Error) != 0) {
								return Diagnostic.Kind.ERROR;
							}
							if ((severity & ProblemSeverities.Optional) != 0) {
								return Diagnostic.Kind.WARNING;
							}
							if ((severity & ProblemSeverities.Warning) != 0) {
								return Diagnostic.Kind.MANDATORY_WARNING;
							}
							return Diagnostic.Kind.OTHER;
						}
						@Override
						public long getLineNumber() {
							return lineNumber;
						}
						@Override
						public String getMessage(Locale locale) {
							if (locale != null) {
								setLocale(locale);
							}
							return getLocalizedMessage(problemId, problemArguments);
						}
						@Override
						public long getPosition() {
							return startPosition;
						}
						@Override
						public JavaFileObject getSource() {
							File f = new File(new String(originatingFileName));
							if (f.exists()) {
								return new EclipseFileObject(null, f.toURI(), JavaFileObject.Kind.SOURCE, null);
							}
							return null;
						}
						@Override
						public long getStartPosition() {
							return startPosition;
						}
					});
				}
				return super.createProblem(originatingFileName, problemId, problemArguments, messageArguments, severity, startPosition, endPosition, lineNumber, columnNumber);
			}
			@Override
			public CategorizedProblem createProblem(
					final char[] originatingFileName,
					final int problemId,
					final String[] problemArguments,
					final int elaborationID,
					final String[] messageArguments,
					final int severity,
					final int startPosition,
					final int endPosition,
					final int lineNumber,
					final int columnNumber) {

				DiagnosticListener<? super JavaFileObject> diagListener = EclipseCompilerImpl.this.diagnosticListener;
				if (diagListener != null) {
					diagListener.report(new Diagnostic<JavaFileObject>() {
						@Override
						public String getCode() {
							return Integer.toString(problemId);
						}
						@Override
						public long getColumnNumber() {
							return columnNumber;
						}
						@Override
						public long getEndPosition() {
							return endPosition;
						}
						@Override
						public Kind getKind() {
							if ((severity & ProblemSeverities.Error) != 0) {
								return Diagnostic.Kind.ERROR;
							}
							if ((severity & ProblemSeverities.Optional) != 0) {
								return Diagnostic.Kind.WARNING;
							}
							if ((severity & ProblemSeverities.Warning) != 0) {
								return Diagnostic.Kind.MANDATORY_WARNING;
							}
							return Diagnostic.Kind.OTHER;
						}
						@Override
						public long getLineNumber() {
							return lineNumber;
						}
						@Override
						public String getMessage(Locale locale) {
							if (locale != null) {
								setLocale(locale);
							}
							return getLocalizedMessage(problemId, problemArguments);
						}
						@Override
						public long getPosition() {
							return startPosition;
						}
						@Override
						public JavaFileObject getSource() {
							File f = new File(new String(originatingFileName));
							if (f.exists()) {
								return new EclipseFileObject(null, f.toURI(), JavaFileObject.Kind.SOURCE, null);
							}
							return null;
						}
						@Override
						public long getStartPosition() {
							return startPosition;
						}
					});
				}
				return super.createProblem(originatingFileName, problemId, problemArguments, elaborationID, messageArguments, severity, startPosition, endPosition, lineNumber, columnNumber);
			}
		};
	}

	@Override
	protected void initialize(PrintWriter outWriter, PrintWriter errWriter, boolean systemExit, Map customDefaultOptions, CompilationProgress compilationProgress) {
		super.initialize(outWriter, errWriter, systemExit, customDefaultOptions, compilationProgress);
		this.javaFileObjectMap = new HashMap<>();
	}

	@Override
	protected void initializeAnnotationProcessorManager() {
		super.initializeAnnotationProcessorManager();
		if (this.batchCompiler.annotationProcessorManager != null && this.processors != null) {
			this.batchCompiler.annotationProcessorManager.setProcessors(this.processors);
		} else if (this.processors != null) {
			throw new UnsupportedOperationException("Cannot handle annotation processing"); //$NON-NLS-1$
		}
	}

	// Dump classfiles onto disk for all compilation units that where successful
	// and do not carry a -d none spec, either directly or inherited from Main.
	@Override
	public void outputClassFiles(CompilationResult unitResult) {
		if (!((unitResult == null) || (unitResult.hasErrors() && !this.proceedOnError))) {
			ClassFile[] classFiles = unitResult.getClassFiles();
			boolean generateClasspathStructure = this.fileManager.hasLocation(StandardLocation.CLASS_OUTPUT);
			String currentDestinationPath = this.destinationPath;
			File outputLocation = null;
			if (currentDestinationPath != null) {
				outputLocation = new File(currentDestinationPath);
				outputLocation.mkdirs();
			}
			for (int i = 0, fileCount = classFiles.length; i < fileCount; i++) {
				// retrieve the key and the corresponding classfile
				ClassFile classFile = classFiles[i];
				char[] filename = classFile.fileName();
				int length = filename.length;
				char[] relativeName = new char[length + 6];
				System.arraycopy(filename, 0, relativeName, 0, length);
				System.arraycopy(SuffixConstants.SUFFIX_class, 0, relativeName, length, 6);
				CharOperation.replace(relativeName, '/', File.separatorChar);
				String relativeStringName = new String(relativeName);
				if (this.compilerOptions.verbose) {
					EclipseCompilerImpl.this.out.println(
						Messages.bind(
							Messages.compilation_write,
							new String[] {
								String.valueOf(this.exportedClassFilesCounter+1),
								relativeStringName
							}));
				}
				try {
					JavaFileObject javaFileForOutput =
						this.fileManager.getJavaFileForOutput(
								StandardLocation.CLASS_OUTPUT,
								new String(filename),
								JavaFileObject.Kind.CLASS,
								this.javaFileObjectMap.get(unitResult.compilationUnit));

					if (generateClasspathStructure) {
						if (currentDestinationPath != null) {
							int index = CharOperation.lastIndexOf(File.separatorChar, relativeName);
							if (index != -1) {
								File currentFolder = new File(currentDestinationPath, relativeStringName.substring(0, index));
								currentFolder.mkdirs();
							}
						} else {
							// create the subfolfers is necessary
							// need a way to retrieve the folders to create
							String path = javaFileForOutput.toUri().getPath();
							int index = path.lastIndexOf('/');
							if (index != -1) {
								File file = new File(path.substring(0, index));
								file.mkdirs();
							}
						}
					}

					try (OutputStream openOutputStream = javaFileForOutput.openOutputStream(); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(openOutputStream)) {
						bufferedOutputStream.write(classFile.header, 0, classFile.headerOffset);
						bufferedOutputStream.write(classFile.contents, 0, classFile.contentsOffset);
						bufferedOutputStream.flush();
					}
				} catch (IOException e) {
					this.logger.logNoClassFileCreated(currentDestinationPath, relativeStringName, e);
				}
				this.logger.logClassFile(
					generateClasspathStructure,
					currentDestinationPath,
					relativeStringName);
				this.exportedClassFilesCounter++;
			}
			this.batchCompiler.lookupEnvironment.releaseClassFiles(classFiles);
		}
	}

	@Override
	protected void setPaths(ArrayList bootclasspaths,
			String sourcepathClasspathArg,
			ArrayList sourcepathClasspaths,
			ArrayList classpaths,
			ArrayList extdirsClasspaths,
			ArrayList endorsedDirClasspaths,
			String customEncoding) {

		ArrayList<FileSystem.Classpath> fileSystemClasspaths = new ArrayList<>();
		EclipseFileManager eclipseJavaFileManager = null;
		StandardJavaFileManager standardJavaFileManager = null;
		JavaFileManager javaFileManager = null;
		boolean havePlatformPaths = false;
		boolean haveClassPaths = false;
		if (this.fileManager instanceof EclipseFileManager) {
			eclipseJavaFileManager = (EclipseFileManager) this.fileManager;
		}
		if (this.fileManager instanceof StandardJavaFileManager) {
			standardJavaFileManager = (StandardJavaFileManager) this.fileManager;
		}
		javaFileManager = this.fileManager;

		if (eclipseJavaFileManager != null) {
			if ((eclipseJavaFileManager.flags & EclipseFileManager.HAS_ENDORSED_DIRS) == 0
					&& (eclipseJavaFileManager.flags & EclipseFileManager.HAS_BOOTCLASSPATH) != 0) {
				fileSystemClasspaths.addAll(this.handleEndorseddirs(null));
			}
		}
		Iterable<? extends File> location = null;
		if (standardJavaFileManager != null) {
			location = standardJavaFileManager.getLocation(StandardLocation.PLATFORM_CLASS_PATH);
			if (location != null) {
				for (File file : location) {
					Classpath classpath = FileSystem.getClasspath(
						file.getAbsolutePath(),
						null,
						null);
					if (classpath != null) {
						fileSystemClasspaths.add(classpath);
						havePlatformPaths = true;
					}
				}
			}
		} else if (javaFileManager != null) {
			Classpath classpath = new ClasspathJsr199(this.fileManager, StandardLocation.PLATFORM_CLASS_PATH);
			fileSystemClasspaths.add(classpath);
			havePlatformPaths = true;
		}
		if (eclipseJavaFileManager != null) {
			if ((eclipseJavaFileManager.flags & EclipseFileManager.HAS_EXT_DIRS) == 0
					&& (eclipseJavaFileManager.flags & EclipseFileManager.HAS_BOOTCLASSPATH) != 0) {
				fileSystemClasspaths.addAll(this.handleExtdirs(null));
			}
		}
		if (standardJavaFileManager != null) {
			location = standardJavaFileManager.getLocation(StandardLocation.SOURCE_PATH);
			if (location != null) {
				for (File file : location) {
					Classpath classpath = FileSystem.getClasspath(
							file.getAbsolutePath(),
							null,
							null);
					if (classpath != null) {
						fileSystemClasspaths.add(classpath);
					}
				}
			}
			location = standardJavaFileManager.getLocation(StandardLocation.CLASS_PATH);
			if (location != null) {
				for (File file : location) {
					Classpath classpath = FileSystem.getClasspath(
						file.getAbsolutePath(),
						null,
						null);
					if (classpath != null) {
						fileSystemClasspaths.add(classpath);
						haveClassPaths = true;
					}
				}
			}
		} else if (javaFileManager != null) {
			Classpath classpath = null;
			if (this.fileManager.hasLocation(StandardLocation.SOURCE_PATH)) {
				classpath = new ClasspathJsr199(this.fileManager, StandardLocation.SOURCE_PATH);
				fileSystemClasspaths.add(classpath);
			}
			classpath = new ClasspathJsr199(this.fileManager, StandardLocation.CLASS_PATH);
			fileSystemClasspaths.add(classpath);
			haveClassPaths = true;
		}
		if (this.checkedClasspaths == null) {
			// It appears to be necessary to handleBootclasspath() for IBM JVMs
			// in order to have visibility to java.lang.String (not present in rt.jar).
			// The jars returned by StandardFileManager.getLocation(PLATFORM_CLASS_PATH) are
			// not sufficient to resolve all standard classes.
			if (!havePlatformPaths) fileSystemClasspaths.addAll(this.handleBootclasspath(null, null));
			if (!haveClassPaths) fileSystemClasspaths.addAll(this.handleClasspath(null, null));
		}
		fileSystemClasspaths = FileSystem.ClasspathNormalizer.normalize(fileSystemClasspaths);
		final int size = fileSystemClasspaths.size();
		if (size != 0) {
			this.checkedClasspaths = new FileSystem.Classpath[size];
			int i = 0;
			for (FileSystem.Classpath classpath : fileSystemClasspaths) {
				this.checkedClasspaths[i++] = classpath;
			}
		}
	}
	@Override
	protected void loggingExtraProblems() {
		super.loggingExtraProblems();
		for (@SuppressWarnings("rawtypes")
			Iterator iterator = this.extraProblems.iterator(); iterator.hasNext(); ) {
			final CategorizedProblem problem = (CategorizedProblem) iterator.next();
			if (this.diagnosticListener != null) {
				this.diagnosticListener.report(new Diagnostic<JavaFileObject>() {
					@Override
					public String getCode() {
						return null;
					}
					@Override
					public long getColumnNumber() {
						if (problem instanceof DefaultProblem) {
							return ((DefaultProblem) problem).column;
						}
						return Diagnostic.NOPOS;
					}
					@Override
					public long getEndPosition() {
						if (problem instanceof DefaultProblem) {
							return ((DefaultProblem) problem).getSourceEnd();
						}
						return Diagnostic.NOPOS;
					}
					@Override
					public Kind getKind() {
						if (problem.isError()) {
							return Diagnostic.Kind.ERROR;
						}
						if (problem.isWarning()) {
							return Diagnostic.Kind.WARNING;
						}
						return Diagnostic.Kind.OTHER;
					}
					@Override
					public long getLineNumber() {
						if (problem instanceof DefaultProblem) {
							return ((DefaultProblem) problem).getSourceLineNumber();
						}
						return Diagnostic.NOPOS;
					}
					@Override
					public String getMessage(Locale locale) {
						return problem.getMessage();
					}
					@Override
					public long getPosition() {
						if (problem instanceof DefaultProblem) {
							return ((DefaultProblem) problem).getSourceStart();
						}
						return Diagnostic.NOPOS;
					}
					@Override
					public JavaFileObject getSource() {
						if (problem instanceof DefaultProblem) {
							File f = new File(new String(((DefaultProblem) problem).getOriginatingFileName()));
							if (f.exists()) {
								return new EclipseFileObject(null, f.toURI(), JavaFileObject.Kind.SOURCE, null);
							}
							return null;
						}
						return null;
					}
					@Override
					public long getStartPosition() {
						return getPosition();
					}
				});
			}
		}
	}
}