/*******************************************************************************
 * Copyright (c) 2012 Wind River Systems 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:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.internal.cdt.ui.breakpoints;

import java.text.MessageFormat;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.cdt.debug.core.model.ICBreakpoint;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.PlatformObject;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.tcf.internal.cdt.ui.Activator;
import org.eclipse.tcf.internal.cdt.ui.ImageCache;
import org.eclipse.tcf.internal.debug.model.ITCFConstants;
import org.eclipse.tcf.internal.debug.model.TCFBreakpointsModel;
import org.eclipse.ui.model.IWorkbenchAdapter;

/**
 * Element which represents a breakpoint scope grouping in Breakpoints view.
 * <p>
 * Scope grouping contains both a filter and context IDs string, however
 * only one of them can be active on a breakpoint at one time.
 *
 */
public class BreakpointScopeCategory extends PlatformObject implements IWorkbenchAdapter {

    private static Object[] EMPTY_CHILDREN_ARRAY = new Object[0];

    private String fFilter;
    private String fContextIds;

    public BreakpointScopeCategory(String filter, String contextIds) {
        fFilter = filter;
        fContextIds = contextIds;
    }

    public String getFilter() {
        return fFilter;
    }

    public String getContextIds() {
        return fContextIds;
    }

    /**
     * Sets the given filter and context strings to all breakpoints which match
     * the group's current scope settings.
     */
    void setFilter(String filter, String contextIds) {
        final List<ICBreakpoint> bps = findCategoryBreakpoints();
        fFilter = filter;
        fContextIds = contextIds;

        if (bps.isEmpty()) return;  // No breakpoints to update
        try {
            ResourcesPlugin.getWorkspace().run(
                new IWorkspaceRunnable() {
                    public void run(IProgressMonitor monitor) throws CoreException {
                        for (ICBreakpoint bp : bps) {
                            getScopeExtension(bp).setPropertiesFilter(fFilter);
                            getScopeExtension(bp).setRawContextIds(fContextIds);
                        }
                    }
                },
                new NullProgressMonitor()
                );
        }
        catch (CoreException e) {
            Activator.log(e);
        }
    }

    public String getLabel(Object o) {
        if (getFilter() != null && getContextIds() != null) {
            return MessageFormat.format(Messages.BreakpointScopeCategory_filter_and_contexts_label, new Object[] { getFilter(), getContextIds() });
        } else if (getFilter() != null) {
            return MessageFormat.format(Messages.BreakpointScopeCategory_filter_label, new Object[] { getFilter() });
        } else if (getContextIds() != null) {
            return MessageFormat.format(Messages.BreakpointScopeCategory_contexts_label, new Object[] { getContextIds() });
        }
        return Messages.BreakpointScopeCategory_global_label;
    }

    public ImageDescriptor getImageDescriptor(Object object) {
        return ImageCache.getImageDescriptor(ImageCache.IMG_BREAKPOINT_SCOPE);
    }

    public Object[] getChildren(Object o) {
        // Not used
        return EMPTY_CHILDREN_ARRAY;
    }

    public Object getParent(Object o) {
        // Not used
        return null;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof BreakpointScopeCategory) {
            BreakpointScopeCategory other = (BreakpointScopeCategory)obj;
            return ((getFilter() == null && other.getFilter() == null) ||
                    (getFilter() != null && getFilter().equals(other.getFilter()))) &&
                   ((getContextIds() == null && other.getContextIds() == null) ||
                    (getContextIds() != null && getContextIds().equals(other.getContextIds())));
        }
        return false;
    }

    @Override
    public int hashCode() {
        return (getFilter() != null ? getFilter().hashCode() : 0) +
                (getContextIds() != null ? getContextIds().hashCode() : 0);
    }

    private List<ICBreakpoint> findCategoryBreakpoints() {
        List<ICBreakpoint> categoryBreakpoints = new LinkedList<ICBreakpoint>();
        IBreakpoint[] breakpoints = DebugPlugin.getDefault().getBreakpointManager().getBreakpoints();
        for (IBreakpoint bp : breakpoints) {
            IMarker bpMarker = bp.getMarker();
            if (bp instanceof ICBreakpoint && bpMarker != null) {
                String filter = bpMarker.getAttribute(TCFBreakpointsModel.ATTR_CONTEXT_QUERY, (String)null);
                String contextIds = bpMarker.getAttribute(TCFBreakpointsModel.ATTR_CONTEXTIDS, (String)null);
                if( ((getFilter() == null && filter == null) ||
                        (getFilter() != null && getFilter().equals(filter))) &&
                       ((getContextIds() == null && contextIds == null) ||
                        (getContextIds() != null && getContextIds().equals(contextIds))) )
                {
                    categoryBreakpoints.add((ICBreakpoint)bp);
                }
            }
        }
        return categoryBreakpoints;
    }

    private TCFBreakpointScopeExtension getScopeExtension(ICBreakpoint bp) throws CoreException {
        return (TCFBreakpointScopeExtension) bp.getExtension(
                ITCFConstants.ID_TCF_DEBUG_MODEL, TCFBreakpointScopeExtension.class);
    }

}