/*******************************************************************************
 *  Copyright (c) 2003, 2012 IBM Corporation and others.
 *
 *  This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License 2.0
 *  which accompanies this distribution, and is available at
 *  https://www.eclipse.org/legal/epl-2.0/
 *
 *  SPDX-License-Identifier: EPL-2.0
 *
 *  Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.debug.core.breakpoints;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IStatusHandler;
import org.eclipse.jdt.debug.core.IJavaStratumLineBreakpoint;
import org.eclipse.jdt.internal.debug.core.JDIDebugPlugin;
import org.eclipse.jdt.internal.debug.core.model.JDIDebugTarget;

import com.sun.jdi.AbsentInformationException;
import com.sun.jdi.ClassNotPreparedException;
import com.sun.jdi.Location;
import com.sun.jdi.NativeMethodException;
import com.sun.jdi.ReferenceType;
import com.sun.jdi.VMDisconnectedException;
import com.sun.jdi.VirtualMachine;

/**
 * A line breakpoint identified by its source file name and/or path, and stratum
 * that it is relative to.
 *
 * @since 3.0
 */
public class JavaStratumLineBreakpoint extends JavaLineBreakpoint implements
		IJavaStratumLineBreakpoint {
	private static final String PATTERN = "org.eclipse.jdt.debug.pattern"; //$NON-NLS-1$
	protected static final String STRATUM = "org.eclipse.jdt.debug.stratum"; //$NON-NLS-1$
	protected static final String SOURCE_PATH = "org.eclipse.jdt.debug.source_path"; //$NON-NLS-1$
	private static final String STRATUM_BREAKPOINT = "org.eclipse.jdt.debug.javaStratumLineBreakpointMarker"; //$NON-NLS-1$
	private String[] fTypeNamePatterns;
	// corresponds to type name patterns with beginning/trailing '*' removed
	private String[] fSuffix;
	private String[] fPrefix;

	public JavaStratumLineBreakpoint() {
	}

	/**
	 * Creates and returns a line breakpoint identified by its source file name
	 * and/or path, and stratum that it is relative to.
	 *
	 * @param resource
	 *            the resource on which to create the associated breakpoint
	 *            marker
	 * @param stratum
	 *            the stratum in which the source name, source path and line
	 *            number are relative, or <code>null</code>. If
	 *            <code>null</code> or if the specified stratum is not defined
	 *            for a type, the source name, source path and line number are
	 *            relative to the type's default stratum.
	 * @param sourceName
	 *            the simple name of the source file in which the breakpoint is
	 *            set, or <code>null</code>. The breakpoint will install itself
	 *            in classes that have a source file name debug attribute that
	 *            matches this value in the specified stratum, and satisfies the
	 *            class name pattern and source path attribute. When
	 *            <code>null</code>, the source file name debug attribute is not
	 *            considered.
	 * @param sourcePath
	 *            the qualified source file name in which the breakpoint is set,
	 *            or <code>null</code>. The breakpoint will install itself in
	 *            classes that have a source file path in the specified stratum
	 *            that matches this value, and satisfies the class name pattern
	 *            and source name attribute. When <code>null</code>, the source
	 *            path attribute is not considered.
	 * @param classNamePattern
	 *            the class name pattern to which the breakpoint should be
	 *            restricted, or <code>null</code>. The breakpoint will install
	 *            itself in each type that matches this class name pattern, with
	 *            a satisfying source name and source path. Patterns may begin
	 *            or end with '*', which matches 0 or more characters. A pattern
	 *            that does not contain a '*' is equivalent to a pattern ending
	 *            in '*'. Specifying <code>null</code>, or an empty string is
	 *            the equivalent to "*".
	 * @param lineNumber
	 *            the lineNumber on which the breakpoint is set - line numbers
	 *            are 1 based, associated with the source file (stratum) in
	 *            which the breakpoint is set
	 * @param charStart
	 *            the first character index associated with the breakpoint, or
	 *            -1 if unspecified, in the source file in which the breakpoint
	 *            is set
	 * @param charEnd
	 *            the last character index associated with the breakpoint, or -1
	 *            if unspecified, in the source file in which the breakpoint is
	 *            set
	 * @param hitCount
	 *            the number of times the breakpoint will be hit before
	 *            suspending execution - 0 if it should always suspend
	 * @param register
	 *            whether to add this breakpoint to the breakpoint manager
	 * @param attributes
	 *            a map of client defined attributes that should be assigned to
	 *            the underlying breakpoint marker on creation, or
	 *            <code>null</code> if none.
	 * @return a stratum breakpoint
	 * @exception CoreException
	 *                If this method fails. Reasons include:
	 *                <ul>
	 *                <li>Failure creating underlying marker. The exception's
	 *                status contains the underlying exception responsible for
	 *                the failure.</li>
	 *                </ul>
	 * @since 3.0
	 */
	public JavaStratumLineBreakpoint(IResource resource, String stratum,
			String sourceName, String sourcePath, String classNamePattern,
			int lineNumber, int charStart, int charEnd, int hitCount,
			boolean register, Map<String, Object> attributes) throws DebugException {
		this(resource, stratum, sourceName, sourcePath, classNamePattern,
				lineNumber, charStart, charEnd, hitCount, register, attributes,
				STRATUM_BREAKPOINT);
	}

	protected JavaStratumLineBreakpoint(final IResource resource,
			final String stratum, final String sourceName,
			final String sourcePath, final String classNamePattern,
			final int lineNumber, final int charStart, final int charEnd,
			final int hitCount, final boolean register, final Map<String, Object> attributes,
			final String markerType) throws DebugException {
		IWorkspaceRunnable wr = new IWorkspaceRunnable() {
			@Override
			public void run(IProgressMonitor monitor) throws CoreException {

				// create the marker
				setMarker(resource.createMarker(markerType));

				// modify pattern
				String pattern = classNamePattern;
				if (pattern != null && pattern.length() == 0) {
					pattern = null;
				}

				// add attributes
				addLineBreakpointAttributes(attributes, getModelIdentifier(),
						true, lineNumber, charStart, charEnd);
				addStratumPatternAndHitCount(attributes, stratum, sourceName,
						sourcePath, pattern, hitCount);
				// set attributes
				attributes.put(SUSPEND_POLICY, Integer.valueOf(getDefaultSuspendPolicy()));
				ensureMarker().setAttributes(attributes);

				register(register);
			}
		};
		run(getMarkerRule(resource), wr);
	}

	/**
	 * Adds the class name pattern and hit count attributes to the given map.
	 */
	protected void addStratumPatternAndHitCount(Map<String, Object> attributes, String stratum,
			String sourceName, String sourcePath, String pattern, int hitCount) {
		attributes.put(PATTERN, pattern);
		attributes.put(STRATUM, stratum);
		if (sourceName != null) {
			attributes.put(SOURCE_NAME, sourceName);
		}
		if (sourcePath != null) {
			attributes.put(SOURCE_PATH, sourcePath);
		}
		if (hitCount > 0) {
			attributes.put(HIT_COUNT, Integer.valueOf(hitCount));
			attributes.put(EXPIRED, Boolean.FALSE);
		}
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.jdt.internal.debug.core.breakpoints.JavaBreakpoint#
	 * installableReferenceType(com.sun.jdi.ReferenceType,
	 * org.eclipse.jdt.internal.debug.core.model.JDIDebugTarget)
	 */
	@Override
	protected boolean installableReferenceType(ReferenceType type,
			JDIDebugTarget target) throws CoreException {

		// check the type name.
		String typeName = type.name();
		if (!validType(typeName)) {
			return false;
		}
		String stratum = getStratum();
		// check the source name.
		String bpSourceName = getSourceName();
		if (bpSourceName != null) {
			List<String> sourceNames;
			try {
				sourceNames = type.sourceNames(stratum);
			} catch (AbsentInformationException e1) {
				return false;
			} catch (VMDisconnectedException e) {
				if (!target.isAvailable()) {
					return false;
				}
				throw e;
			}
			if (!containsMatch(sourceNames, bpSourceName)) {
				return false;
			}
		}

		String bpSourcePath = getSourcePath();
		if (bpSourcePath != null) {
			// check that source paths match
			List<String> sourcePaths;
			try {
				sourcePaths = type.sourcePaths(stratum);
			} catch (AbsentInformationException e1) {
				return false;
			} catch (VMDisconnectedException e) {
				if (!target.isAvailable()) {
					return false;
				}
				throw e;
			}
			if (!containsMatch(sourcePaths, bpSourcePath)) {
				return false;
			}
		}
		return queryInstallListeners(target, type);
	}

	private boolean containsMatch(List<String> strings, String key) {
		for (String string : strings) {
			if (string.equals(key)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * @param typeName
	 * @return
	 */
	private boolean validType(String typeName) throws CoreException {

		String[] patterns = getTypeNamePatterns();
		for (int i = 0; i < patterns.length; i++) {
			if (fSuffix[i] != null) {
				// pattern starting with '*'
				if (fSuffix[i].length() == 0) {
					return true;
				}
				if (typeName.endsWith(fSuffix[i]))
					return true;
			} else if (fPrefix[i] != null) {
				if (typeName.startsWith(fPrefix[i]))
					return true;
			} else {
				if (typeName.startsWith(patterns[i]))
					return true;
			}
		}

		// return false if we cannot find a type name to match
		return false;
	}

	/**
	 * Returns a list of locations for the given line number in the given type.
	 * Returns <code>null</code> if a location cannot be determined.
	 */
	@Override
	protected List<Location> determineLocations(int lineNumber, ReferenceType type,
			JDIDebugTarget target) {
		List<Location> locations;
		String sourcePath;
		try {
			locations = type.locationsOfLine(getStratum(), getSourceName(),
					lineNumber);
			sourcePath = getSourcePath();
		} catch (AbsentInformationException aie) {
			IStatus status = new Status(
					IStatus.ERROR,
					JDIDebugPlugin.getUniqueIdentifier(),
					NO_LINE_NUMBERS,
					JDIDebugBreakpointMessages.JavaLineBreakpoint_Absent_Line_Number_Information_1,
					null);
			IStatusHandler handler = DebugPlugin.getDefault().getStatusHandler(
					status);
			if (handler != null) {
				try {
					handler.handleStatus(status, type);
				} catch (CoreException e) {
				}
			}
			return null;
		} catch (NativeMethodException e) {
			return null;
		} catch (VMDisconnectedException e) {
			return null;
		} catch (ClassNotPreparedException e) {
			// could be a nested type that is not yet loaded
			return null;
		} catch (RuntimeException e) {
			// not able to retrieve line info
			target.internalError(e);
			return null;
		} catch (CoreException e) {
			// not able to retrieve line info
			JDIDebugPlugin.log(e);
			return null;
		}

		if (sourcePath == null) {
			if (locations.size() > 0) {
				return locations;
			}
		} else {
			for(Location location : locations) {
				try {
					if (!sourcePath.equals(location.sourcePath())) {
						locations.remove(location);
					}
				} catch (AbsentInformationException e1) {
					// nothing to do;
				}
			}
			if (locations.size() > 0) {
				return locations;
			}
		}

		return null;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.jdt.debug.core.IJavaStratumLineBreakpoint#getPattern()
	 */
	@Override
	public String getPattern() throws CoreException {
		return ensureMarker().getAttribute(PATTERN, "*"); //$NON-NLS-1$
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * org.eclipse.jdt.debug.core.IJavaStratumLineBreakpoint#getSourceName()
	 */
	@Override
	public String getSourceName() throws CoreException {
		return (String) ensureMarker().getAttribute(SOURCE_NAME);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.jdt.debug.core.IJavaStratumLineBreakpoint#getStratum()
	 */
	@Override
	public String getStratum() throws CoreException {
		return (String) ensureMarker().getAttribute(STRATUM);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * org.eclipse.jdt.debug.core.IJavaStratumLineBreakpoint#getSourcePath()
	 */
	@Override
	public String getSourcePath() throws CoreException {
		return (String) ensureMarker().getAttribute(SOURCE_PATH);
	}

	@Override
	protected void createRequests(JDIDebugTarget target) throws CoreException {
		if (target.isTerminated() || shouldSkipBreakpoint()) {
			return;
		}

		String[] patterns = null;
		try {
			patterns = getTypeNamePatterns();
		} catch (CoreException e1) {
			JDIDebugPlugin.log(e1);
			return;
		}

		String sourceName = getSourceName();
		for (String classPrepareTypeName : patterns) {
			// create request to listen to class loads
			// name may only be partially resolved
			registerRequest(target.createClassPrepareRequest(
					classPrepareTypeName, null, true, sourceName), target);
		}

		// create breakpoint requests for each class currently loaded
		VirtualMachine vm = target.getVM();
		if (vm == null) {
			target.requestFailed(
					JDIDebugBreakpointMessages.JavaPatternBreakpoint_Unable_to_add_breakpoint___VM_disconnected__1,
					new VMDisconnectedException());
		}
		List<ReferenceType> classes = null;
		try {
			classes = vm.allClasses();
		} catch (RuntimeException e) {
			target.targetRequestFailed(
					JDIDebugBreakpointMessages.JavaPatternBreakpoint_0, e);
		}
		if (classes != null) {
			Iterator<ReferenceType> iter = classes.iterator();
			while (iter.hasNext()) {
				ReferenceType type = iter.next();
				if (installableReferenceType(type, target)) {
					createRequest(target, type);
				}
			}
		}
	}

	public synchronized String[] getTypeNamePatterns() throws CoreException {
		if (fTypeNamePatterns != null)
			return fTypeNamePatterns;

		String patterns = getPattern();

		// delimit by ","
		fTypeNamePatterns = patterns.split(","); //$NON-NLS-1$
		fSuffix = new String[fTypeNamePatterns.length];
		fPrefix = new String[fTypeNamePatterns.length];
		for (int i = 0; i < fTypeNamePatterns.length; i++) {
			fTypeNamePatterns[i] = fTypeNamePatterns[i].trim();
			String pattern = fTypeNamePatterns[i];
			if (pattern.charAt(0) == '*') {
				if (pattern.length() > 1) {
					fSuffix[i] = pattern.substring(1);
				} else {
					fSuffix[i] = ""; //$NON-NLS-1$
				}
			} else if (pattern.charAt(pattern.length() - 1) == '*') {
				fPrefix[i] = pattern.substring(0, pattern.length() - 1);
			}
		}

		return fTypeNamePatterns;
	}

}