/*******************************************************************************
 * Copyright (c) 2000, 2007 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
 *******************************************************************************/
package org.eclipse.ui.internal.console;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.IBasicPropertyConstants;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IPartListener2;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchPartReference;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.console.AbstractConsole;
import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IConsoleConstants;
import org.eclipse.ui.console.IConsoleListener;
import org.eclipse.ui.console.IConsoleManager;
import org.eclipse.ui.console.IConsolePageParticipant;
import org.eclipse.ui.console.IConsoleView;
import org.eclipse.ui.part.IPage;
import org.eclipse.ui.part.IPageBookViewPage;
import org.eclipse.ui.part.MessagePage;
import org.eclipse.ui.part.PageBook;
import org.eclipse.ui.part.PageBookView;
import org.eclipse.ui.progress.IWorkbenchSiteProgressService;

/**
 * Page book console view.
 * 
 * @since 3.0
 */
public class ConsoleView extends PageBookView implements IConsoleView, IConsoleListener, IPropertyChangeListener, IPartListener2 {
	
	/**
	 * Whether this console is pinned.
	 */
	private boolean fPinned = false;
	
	/**
	 * Stack of consoles in MRU order
	 */
	private List fStack = new ArrayList();
	
	/**
	 * The console being displayed, or <code>null</code> if none
	 */
	private IConsole fActiveConsole = null;
	
	/**
	 * Map of consoles to dummy console parts (used to close pages)
	 */
	private Map fConsoleToPart;
	
	/**
	 * Map of consoles to array of page participants
	 */
	private Map fConsoleToPageParticipants;
	
	/**
	 * Map of parts to consoles
	 */
	private Map fPartToConsole;
	
	/**
	 * Whether this view is active
	 */
	private boolean fActive = false;
	
	// actions
	private PinConsoleAction fPinAction = null; 
	private ConsoleDropDownAction fDisplayConsoleAction = null;
	
	private OpenConsoleAction fOpenConsoleAction = null;

    private boolean fScrollLock;

	private boolean isAvailable() {
		return getPageBook() != null && !getPageBook().isDisposed();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
	 */
	public void propertyChange(PropertyChangeEvent event) {
		Object source = event.getSource();
		if (source instanceof IConsole && event.getProperty().equals(IBasicPropertyConstants.P_TEXT)) {
			if (source.equals(getConsole())) {
				updateTitle();
			}
		}

	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener#partClosed(org.eclipse.ui.IWorkbenchPart)
	 */
	public void partClosed(IWorkbenchPart part) {
		super.partClosed(part);
		fPinAction.update();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.console.IConsoleView#getConsole()
	 */
	public IConsole getConsole() {
		return fActiveConsole;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#showPageRec(org.eclipse.ui.part.PageBookView.PageRec)
	 */
	protected void showPageRec(PageRec pageRec) {
        // don't show the page when pinned, unless this is the first console to be added
        // or its the default page
        if (fActiveConsole != null && pageRec.page != getDefaultPage() && fPinned && fConsoleToPart.size() > 1) {
            IConsole console = (IConsole)fPartToConsole.get(pageRec.part);
            if (!fStack.contains(console)) {
                fStack.add(console);
            }
            return;
        }
        
        IConsole recConsole = (IConsole)fPartToConsole.get(pageRec.part);
        if (recConsole!=null && recConsole.equals(fActiveConsole)) {
            return;
        }
        
	    super.showPageRec(pageRec);
	    fActiveConsole = recConsole;
	    IConsole tos = null;
	    if (!fStack.isEmpty()) {
	        tos = (IConsole) fStack.get(0);
	    }
	    if (tos != null && !tos.equals(fActiveConsole)) {
	        deactivateParticipants(tos);
	    }
	    if (fActiveConsole != null && !fActiveConsole.equals(tos)) {
	        fStack.remove(fActiveConsole);
	        fStack.add(0,fActiveConsole);
	        activateParticipants(fActiveConsole);
	    }
	    updateTitle();	
	    updateHelp();
	    // update console actions
	    if (fPinAction != null) {
	        fPinAction.update();
	    }
	    IPage page = getCurrentPage();
	    if (page instanceof IOConsolePage) {
	        ((IOConsolePage)page).setAutoScroll(!fScrollLock);
	    }
	}
	
	/**
	 * Activates the participants for the given console, if any.
	 * 
	 * @param console
	 */
	private void activateParticipants(IConsole console) {
		// activate
		if (console != null && fActive) {
			final ListenerList listeners = getParticipants(console);
			if (listeners != null) {
				Object[] participants = listeners.getListeners();
			    for (int i = 0; i < participants.length; i++) {
			    	final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
			    	SafeRunner.run(new ISafeRunnable() {
						public void run() throws Exception {
							participant.activated();
						}
						public void handleException(Throwable exception) {
							ConsolePlugin.log(exception);
							listeners.remove(participant);
						}
					});
			    }
			}
		}
	}

	/**
	 * Returns a stack of consoles in the view in MRU order.
	 * 
	 * @return a stack of consoles in the view in MRU order
	 */
	protected List getConsoleStack() {
		return fStack;
	}

	/**
	 * Updates the view title based on the active console
	 */
    protected void updateTitle() {
        IConsole console = getConsole();
        if (console == null) {
            setContentDescription(ConsoleMessages.ConsoleView_0); 
        } else {
            String newName = console.getName();
            String oldName = getContentDescription();
            if (newName!=null && !(newName.equals(oldName))) {
                setContentDescription(console.getName()); 
            }
        }
    }
    
    protected void updateHelp() {
    	IConsole console = getConsole();
    	String helpContextId = null;
		if (console instanceof AbstractConsole) {
			AbstractConsole abs = (AbstractConsole) console;
			helpContextId = abs.getHelpContextId();
		}
		if (helpContextId == null) {
			helpContextId = IConsoleHelpContextIds.CONSOLE_VIEW;
		}
		PlatformUI.getWorkbench().getHelpSystem().setHelp(getPageBook().getParent(), helpContextId);
    }

	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#doDestroyPage(org.eclipse.ui.IWorkbenchPart, org.eclipse.ui.part.PageBookView.PageRec)
	 */
	protected void doDestroyPage(IWorkbenchPart part, PageRec pageRecord) {
	    IConsole console = (IConsole)fPartToConsole.get(part);
	    
		// dispose page participants
		ListenerList listeners = (ListenerList) fConsoleToPageParticipants.remove(console);
		if (listeners != null) {
			Object[] participants = listeners.getListeners();
			for (int i = 0; i < participants.length; i++) {
	            final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
	            SafeRunner.run(new ISafeRunnable() {
					public void run() throws Exception {
						participant.dispose();
					}
					public void handleException(Throwable exception) {
						ConsolePlugin.log(exception);
					}
				});
	        }
		}

		IPage page = pageRecord.page;
		page.dispose();
		pageRecord.dispose();
		console.removePropertyChangeListener(this);
						
		// empty cross-reference cache
		fPartToConsole.remove(part);
		fConsoleToPart.remove(console);
        if (fPartToConsole.isEmpty()) {
            fActiveConsole = null;
        }
		
		// update console actions
		fPinAction.update();		
	}
	
	/**
	 * Returns the page participants registered for the given console, or <code>null</code>
	 * 
	 * @param console
	 * @return registered page participants or <code>null</code>
	 */
	private ListenerList getParticipants(IConsole console) {
	    return (ListenerList) fConsoleToPageParticipants.get(console);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#doCreatePage(org.eclipse.ui.IWorkbenchPart)
	 */
	protected PageRec doCreatePage(IWorkbenchPart dummyPart) {
		ConsoleWorkbenchPart part = (ConsoleWorkbenchPart)dummyPart;
		final IConsole console = part.getConsole();
		final IPageBookViewPage page = console.createPage(this);
		initPage(page);
		page.createControl(getPageBook());
		console.addPropertyChangeListener(this);
		
		// initialize page participants
		IConsolePageParticipant[] consoleParticipants = ((ConsoleManager)getConsoleManager()).getPageParticipants(console);
		final ListenerList participants = new ListenerList();
		for (int i = 0; i < consoleParticipants.length; i++) {
			participants.add(consoleParticipants[i]);
		}
		fConsoleToPageParticipants.put(console, participants);
		Object[] listeners = participants.getListeners();
		for (int i = 0; i < listeners.length; i++) {
            final IConsolePageParticipant participant = (IConsolePageParticipant) listeners[i];
            SafeRunner.run(new ISafeRunnable() {
				public void run() throws Exception {
					participant.init(page, console);
				}
				public void handleException(Throwable exception) {
					ConsolePlugin.log(exception);
					participants.remove(participant);
				}
			});
        }
		
		PageRec rec = new PageRec(dummyPart, page);
		return rec;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#isImportant(org.eclipse.ui.IWorkbenchPart)
	 */
	protected boolean isImportant(IWorkbenchPart part) {
		return part instanceof ConsoleWorkbenchPart;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IWorkbenchPart#dispose()
	 */
	public void dispose() {
		super.dispose();
		getViewSite().getPage().removePartListener((IPartListener2)this);
        ConsoleManager consoleManager = (ConsoleManager) ConsolePlugin.getDefault().getConsoleManager();
        consoleManager.removeConsoleListener(this);        
        consoleManager.unregisterConsoleView(this);
	}

	/**
	 * Returns the console manager.
	 * 
     * @return the console manager
     */
    private IConsoleManager getConsoleManager() {
        return ConsolePlugin.getDefault().getConsoleManager();
    }

    /* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#createDefaultPage(org.eclipse.ui.part.PageBook)
	 */
	protected IPage createDefaultPage(PageBook book) {
		MessagePage page = new MessagePage();
		page.createControl(getPageBook());
		initPage(page);
		return page;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleListener#consolesAdded(org.eclipse.ui.console.IConsole[])
	 */
	public void consolesAdded(final IConsole[] consoles) {
		if (isAvailable()) {
			Runnable r = new Runnable() {
				public void run() {
					for (int i = 0; i < consoles.length; i++) {
						if (isAvailable()) {
							IConsole console = consoles[i];
							// ensure it's still registered since this is done asynchronously
							IConsole[] allConsoles = getConsoleManager().getConsoles();
							for (int j = 0; j < allConsoles.length; j++) {
                                IConsole registered = allConsoles[j];
                                if (registered.equals(console)) {
        							ConsoleWorkbenchPart part = new ConsoleWorkbenchPart(console, getSite());
        							fConsoleToPart.put(console, part);
        							fPartToConsole.put(part, console);
        							partActivated(part);
        							break;
                                }
                            }

						}
					}
				}
			};
			asyncExec(r);
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleListener#consolesRemoved(org.eclipse.ui.console.IConsole[])
	 */
	public void consolesRemoved(final IConsole[] consoles) {
		if (isAvailable()) {
			Runnable r = new Runnable() {
				public void run() {
					for (int i = 0; i < consoles.length; i++) {
						if (isAvailable()) {
							IConsole console = consoles[i];
							fStack.remove(console);
							ConsoleWorkbenchPart part = (ConsoleWorkbenchPart)fConsoleToPart.get(console);
							if (part != null) {
								partClosed(part);
							}
							if (getConsole() == null) {
								IConsole[] available = getConsoleManager().getConsoles();
								if (available.length > 0) {
									display(available[available.length - 1]);
								}
							}
						}
					}
				}
			};
			asyncExec(r);
		}
	}

	/**
	 * Constructs a console view
	 */
	public ConsoleView() {
		super();
		fConsoleToPart = new HashMap();
		fPartToConsole = new HashMap();
		fConsoleToPageParticipants = new HashMap();
        
		ConsoleManager consoleManager = (ConsoleManager) ConsolePlugin.getDefault().getConsoleManager();
		consoleManager.registerConsoleView(this);
	}
	
	protected void createActions() {
		fPinAction = new PinConsoleAction(this);
		fDisplayConsoleAction = new ConsoleDropDownAction(this);
		ConsoleFactoryExtension[] extensions = ((ConsoleManager)ConsolePlugin.getDefault().getConsoleManager()).getConsoleFactoryExtensions();
		if (extensions.length > 0) {
		    fOpenConsoleAction = new OpenConsoleAction();
		}
	}

	protected void configureToolBar(IToolBarManager mgr) {
		mgr.add(new Separator(IConsoleConstants.LAUNCH_GROUP));
		mgr.add(new Separator(IConsoleConstants.OUTPUT_GROUP));
		mgr.add(new Separator("fixedGroup")); //$NON-NLS-1$
		mgr.add(fPinAction);
		mgr.add(fDisplayConsoleAction);
		if (fOpenConsoleAction != null) {
		    mgr.add(fOpenConsoleAction);
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleView#display(org.eclipse.ui.console.IConsole)
	 */
	public void display(IConsole console) {
	    if (fPinned && fActiveConsole != null) {
            return;
        }
        if (console.equals(fActiveConsole)) {
            return;
        }
	    ConsoleWorkbenchPart part = (ConsoleWorkbenchPart)fConsoleToPart.get(console);
	    if (part != null) {
	        partActivated(part);
	    }
	}

	/*/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleView#pin(org.eclipse.ui.console.IConsole)
	 */
	public void setPinned(boolean pin) {
        fPinned = pin;
	    if (fPinAction != null) {
			fPinAction.update();
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleView#isPinned()
	 */
	public boolean isPinned() {
		return fPinned;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.PageBookView#getBootstrapPart()
	 */
	protected IWorkbenchPart getBootstrapPart() {
		return null;
	}
	
	/**
	 * Registers the given runnable with the display
	 * associated with this view's control, if any.
	 * 
	 * @see org.eclipse.swt.widgets.Display#asyncExec(java.lang.Runnable)
	 */
	public void asyncExec(Runnable r) {
		if (isAvailable()) {
			getPageBook().getDisplay().asyncExec(r);
		}
	}
	
	/**
	 * Creates this view's underlying viewer and actions.
	 * Hooks a pop-up menu to the underlying viewer's control,
	 * as well as a key listener. When the delete key is pressed,
	 * the <code>REMOVE_ACTION</code> is invoked. Hooks help to
	 * this view. Subclasses must implement the following methods
	 * which are called in the following order when a view is
	 * created:<ul>
	 * <li><code>createViewer(Composite)</code> - the context
	 *   menu is hooked to the viewer's control.</li>
	 * <li><code>createActions()</code></li>
	 * <li><code>configureToolBar(IToolBarManager)</code></li>
	 * <li><code>getHelpContextId()</code></li>
	 * </ul>
	 * @see IWorkbenchPart#createPartControl(Composite)
	 */
	public void createPartControl(Composite parent) {
		super.createPartControl(parent);
		createActions();
		IToolBarManager tbm= getViewSite().getActionBars().getToolBarManager();
		configureToolBar(tbm);
		updateForExistingConsoles();
		getViewSite().getActionBars().updateActionBars();
		PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, IConsoleHelpContextIds.CONSOLE_VIEW);
		getViewSite().getPage().addPartListener((IPartListener2)this);
	}
	
	/**
	 * Initialize for existing consoles
	 */
	private void updateForExistingConsoles() {
		IConsoleManager manager = getConsoleManager();
		// create pages for consoles
		IConsole[] consoles = manager.getConsoles();
		consolesAdded(consoles);
		// add as a listener
		manager.addConsoleListener(this);		
	}	
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.console.IConsoleView#warnOfContentChange(org.eclipse.ui.console.IConsole)
	 */
	public void warnOfContentChange(IConsole console) {
		IWorkbenchPart part = (IWorkbenchPart)fConsoleToPart.get(console);
		if (part != null) {
			IWorkbenchSiteProgressService service = (IWorkbenchSiteProgressService) part.getSite().getAdapter(IWorkbenchSiteProgressService.class);
			if (service != null) {
				service.warnOfContentChange();
			}
		}
	}
	
    public Object getAdapter(Class key) {
        Object adpater = super.getAdapter(key);
        if (adpater == null) {
            IConsole console = getConsole();
            if (console != null) {
                ListenerList listeners = getParticipants(console);
                // an adapter can be asked for before the console participants are created
                if (listeners != null) {
                	Object[] participants = listeners.getListeners();
                    for (int i = 0; i < participants.length; i++) {
                        IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
                        adpater = participant.getAdapter(key);
                        if (adpater != null) {
                            return adpater;
                        }
                    }
                }
            }
        }
        return adpater;
    }

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partActivated(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partActivated(IWorkbenchPartReference partRef) {
		if (isThisPart(partRef)) {
			fActive = true;
			activateParticipants(fActiveConsole); 
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partBroughtToTop(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partBroughtToTop(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partClosed(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partClosed(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partDeactivated(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partDeactivated(IWorkbenchPartReference partRef) {
        if (isThisPart(partRef)) {
			fActive = false;
			deactivateParticipants(fActiveConsole);
        }
	}
    
    protected boolean isThisPart(IWorkbenchPartReference partRef) {
        if (partRef instanceof IViewReference) {
            IViewReference viewRef = (IViewReference) partRef;
            if (viewRef.getId().equals(getViewSite().getId())) {
                String secId = viewRef.getSecondaryId();
                String mySec = null;
                if (getSite() instanceof IViewSite) {
                    mySec = ((IViewSite)getSite()).getSecondaryId();
                }
                if (mySec == null) {
                    return secId == null;
                }
                return mySec.equals(secId);
            }
        }
        return false;
    }

	/**
	 * Deactivates participants for the given console, if any.
	 * 
	 * @param console console to deactivate
	 */
	private void deactivateParticipants(IConsole console) {
		// deactivate
	    if (console != null) {
			final ListenerList listeners = getParticipants(console);
			if (listeners != null) {
				Object[] participants = listeners.getListeners();
			    for (int i = 0; i < participants.length; i++) {
			    	final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
			    	SafeRunner.run(new ISafeRunnable() {
						public void run() throws Exception {
							participant.deactivated();
						}
						public void handleException(Throwable exception) {
							ConsolePlugin.log(exception);
							listeners.remove(participant);
						}
					});
                }
			}
	    }
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partOpened(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partOpened(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partHidden(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partHidden(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partVisible(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partVisible(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IPartListener2#partInputChanged(org.eclipse.ui.IWorkbenchPartReference)
	 */
	public void partInputChanged(IWorkbenchPartReference partRef) {		
	}

    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsoleView#setScrollLock(boolean)
     */
    public void setScrollLock(boolean scrollLock) {
        fScrollLock = scrollLock;

        IPage page = getCurrentPage();
        if (page instanceof IOConsolePage) {
            ((IOConsolePage)page).setAutoScroll(!scrollLock);
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsoleView#getScrollLock()
     */
    public boolean getScrollLock() {
        return fScrollLock;
    }
    
    /* (non-Javadoc)
     * @see org.eclipse.ui.console.IConsoleView#pin(org.eclipse.ui.console.IConsole)
     */
    public void pin(IConsole console) {
        if (console == null) {
            setPinned(false);
        } else {
            if (isPinned()) {
                setPinned(false);
            }
            display(console);
            setPinned(true);
        }
    }
}