/*******************************************************************************
 * Copyright (c) 2000, 2018 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.debug.internal.ui.views.console;

import java.io.IOException;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.debug.core.DebugEvent;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IDebugEventSetListener;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.model.IDebugTarget;
import org.eclipse.debug.core.model.IProcess;
import org.eclipse.debug.core.model.IStreamsProxy;
import org.eclipse.debug.core.model.IStreamsProxy2;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IConsoleConstants;
import org.eclipse.ui.console.IConsolePageParticipant;
import org.eclipse.ui.console.IConsoleView;
import org.eclipse.ui.contexts.IContextActivation;
import org.eclipse.ui.contexts.IContextService;
import org.eclipse.ui.handlers.IHandlerActivation;
import org.eclipse.ui.handlers.IHandlerService;
import org.eclipse.ui.part.IPageBookViewPage;
import org.eclipse.ui.part.IPageSite;
import org.eclipse.ui.part.IShowInSource;
import org.eclipse.ui.part.IShowInTargetList;
import org.eclipse.ui.part.ShowInContext;

/**
 * Creates and manages process console specific actions
 *
 * @since 3.1
 */
public class ProcessConsolePageParticipant implements IConsolePageParticipant, IShowInSource, IShowInTargetList, IDebugEventSetListener, IDebugContextListener {

	// actions
	private ConsoleTerminateAction fTerminate;
    private ConsoleRemoveLaunchAction fRemoveTerminated;
	private ConsoleRemoveAllTerminatedAction fRemoveAllTerminated;
	private ShowWhenContentChangesAction fStdOut;
	private ShowWhenContentChangesAction fStdErr;

    private ProcessConsole fConsole;

    private IPageBookViewPage fPage;

    private IConsoleView fView;

    private EOFHandler fEOFHandler;
    private String fContextId = "org.eclipse.debug.ui.console"; //$NON-NLS-1$;
    private IContextActivation fActivatedContext;
    private IHandlerActivation fActivatedHandler;
	/**
	 * Handler to send EOF
	 */
	private class EOFHandler extends AbstractHandler {
        @Override
		public Object execute(ExecutionEvent event) throws org.eclipse.core.commands.ExecutionException {
            IStreamsProxy proxy = getProcess().getStreamsProxy();
            if (proxy instanceof IStreamsProxy2) {
                IStreamsProxy2 proxy2 = (IStreamsProxy2) proxy;
                try {
                    proxy2.closeInputStream();
                } catch (IOException e1) {
                }
            }
            return null;
        }

	}

    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsolePageParticipant#init(IPageBookViewPage, IConsole)
     */
    @Override
	public void init(IPageBookViewPage page, IConsole console) {
        fPage = page;
        fConsole = (ProcessConsole) console;

        fRemoveTerminated = new ConsoleRemoveLaunchAction(fConsole.getProcess().getLaunch());
        fRemoveAllTerminated = new ConsoleRemoveAllTerminatedAction();
        fTerminate = new ConsoleTerminateAction(page.getSite().getWorkbenchWindow(), fConsole);
        fStdOut = new ShowStandardOutAction();
        fStdErr = new ShowStandardErrorAction();

        fView = (IConsoleView) fPage.getSite().getPage().findView(IConsoleConstants.ID_CONSOLE_VIEW);

        DebugPlugin.getDefault().addDebugEventListener(this);
        DebugUITools.getDebugContextManager().getContextService(fPage.getSite().getWorkbenchWindow()).addDebugContextListener(this);

        // contribute to toolbar
        IActionBars actionBars = fPage.getSite().getActionBars();
        configureToolBar(actionBars.getToolBarManager());

        // create handler and submissions for EOF
        fEOFHandler = new EOFHandler();
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsolePageParticipant#dispose()
     */
    @Override
	public void dispose() {
        DebugUITools.getDebugContextManager().getContextService(fPage.getSite().getWorkbenchWindow()).removeDebugContextListener(this);
		DebugPlugin.getDefault().removeDebugEventListener(this);
        if (fRemoveTerminated != null) {
            fRemoveTerminated.dispose();
            fRemoveTerminated = null;
        }
		if (fRemoveAllTerminated != null) {
			fRemoveAllTerminated.dispose();
			fRemoveAllTerminated = null;
		}
		if (fTerminate != null) {
		    fTerminate.dispose();
		    fTerminate = null;
		}
		if (fStdOut != null) {
			fStdOut.dispose();
			fStdOut = null;
		}
		if (fStdErr != null) {
			fStdErr.dispose();
			fStdErr = null;
		}
		fConsole = null;
    }

    /**
     * Contribute actions to the toolbar
     */
    protected void configureToolBar(IToolBarManager mgr) {
		mgr.appendToGroup(IConsoleConstants.LAUNCH_GROUP, fTerminate);
        mgr.appendToGroup(IConsoleConstants.LAUNCH_GROUP, fRemoveTerminated);
		mgr.appendToGroup(IConsoleConstants.LAUNCH_GROUP, fRemoveAllTerminated);
		mgr.appendToGroup(IConsoleConstants.OUTPUT_GROUP, fStdOut);
		mgr.appendToGroup(IConsoleConstants.OUTPUT_GROUP, fStdErr);
    }

    /* (non-Javadoc)
     * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
     */
	@SuppressWarnings("unchecked")
	@Override
	public <T> T getAdapter(Class<T> required) {
        if (IShowInSource.class.equals(required)) {
			return (T) this;
        }
        if (IShowInTargetList.class.equals(required)) {
			return (T) this;
        }
        //CONTEXTLAUNCHING
        if(ILaunchConfiguration.class.equals(required)) {
        	ILaunch launch = getProcess().getLaunch();
        	if(launch != null) {
				return (T) launch.getLaunchConfiguration();
        	}
        	return null;
        }
        return null;
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.part.IShowInSource#getShowInContext()
     */
    @Override
	public ShowInContext getShowInContext() {
        IProcess process = getProcess();
        if (process == null) {
            return null;
        }
        IDebugTarget target = process.getAdapter(IDebugTarget.class);
        ISelection selection = null;
        if (target == null) {
            selection = new TreeSelection(new TreePath(new Object[]{
            		DebugPlugin.getDefault().getLaunchManager(),
            		process.getLaunch(),
            		process}));
        } else {
        	selection = new TreeSelection(new TreePath(new Object[]{
            		DebugPlugin.getDefault().getLaunchManager(),
            		target.getLaunch(),
            		target}));
        }
        return new ShowInContext(null, selection);
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.part.IShowInTargetList#getShowInTargetIds()
     */
    @Override
	public String[] getShowInTargetIds() {
        return new String[] {IDebugUIConstants.ID_DEBUG_VIEW};
    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.core.IDebugEventSetListener#handleDebugEvents(org.eclipse.debug.core.DebugEvent[])
     */
    @Override
	public void handleDebugEvents(DebugEvent[] events) {
        for (int i = 0; i < events.length; i++) {
            DebugEvent event = events[i];
            if (event.getSource().equals(getProcess())) {
				Runnable r = () -> {
					if (fTerminate != null) {
						fTerminate.update();
					}
				};

                DebugUIPlugin.getStandardDisplay().asyncExec(r);
            }
        }
    }

    protected IProcess getProcess() {
        return fConsole != null ? fConsole.getProcess() : null;
    }

	/* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsolePageParticipant#activated()
     */
    @Override
	public void activated() {
        // add EOF submissions
        IPageSite site = fPage.getSite();
        if(fActivatedContext == null && fActivatedHandler == null) {
	        IHandlerService handlerService = site.getService(IHandlerService.class);
	        IContextService contextService = site.getService(IContextService.class);
	        fActivatedContext = contextService.activateContext(fContextId);
	        fActivatedHandler = handlerService.activateHandler("org.eclipse.debug.ui.commands.eof", fEOFHandler); //$NON-NLS-1$
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsolePageParticipant#deactivated()
     */
    @Override
	public void deactivated() {
        // remove EOF submissions
        IPageSite site = fPage.getSite();
        IHandlerService handlerService = site.getService(IHandlerService.class);
        IContextService contextService = site.getService(IContextService.class);
        handlerService.deactivateHandler(fActivatedHandler);
		contextService.deactivateContext(fActivatedContext);
		fActivatedContext = null;
		fActivatedHandler = null;
    }

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextListener#contextEvent(org.eclipse.debug.internal.ui.contexts.provisional.DebugContextEvent)
	 */
	@Override
	public void debugContextChanged(DebugContextEvent event) {
		if ((event.getFlags() & DebugContextEvent.ACTIVATED) > 0) {
			if (fView != null && getProcess().equals(DebugUITools.getCurrentProcess())) {
	            fView.display(fConsole);
	        }
		}

	}
}