/*******************************************************************************
 * Copyright (c) 2001, 2006 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.reconcile;

import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.reconciler.IReconcileResult;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.IAnnotationAccessExtension;
import org.eclipse.jface.text.source.IAnnotationPresentation;
import org.eclipse.jface.text.source.ImageUtilities;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.ui.editors.text.EditorsUI;
import org.eclipse.ui.texteditor.AnnotationPreference;
import org.eclipse.ui.texteditor.AnnotationPreferenceLookup;
import org.eclipse.wst.sse.ui.internal.ITemporaryAnnotation;


/**
 * An implementation of ITemporaryAnnotation @
 * @author pavery
 */
public class TemporaryAnnotation extends Annotation implements ITemporaryAnnotation, IReconcileResult, IAnnotationPresentation {
	// remember to change these if it changes in the extension point
	// may need a different home for them in the future, but they're here for
	// now
	public final static String ANNOT_ERROR = "org.eclipse.wst.sse.ui.temp.error"; //$NON-NLS-1$
	public final static String ANNOT_INFO = "org.eclipse.wst.sse.ui.temp.info"; //$NON-NLS-1$

	// pa_TODO what should the ID be for this?
	public final static String ANNOT_UNKNOWN = Annotation.TYPE_UNKNOWN;
	public final static String ANNOT_WARNING = "org.eclipse.wst.sse.ui.temp.warning"; //$NON-NLS-1$

    // copied from CompilationUnitDocumentProvider.ProblemAnnotation
    //XXX: To be fully correct these constants should be non-static

    private static final int INFO_LAYER;

    private static final int WARNING_LAYER;

    private static final int ERROR_LAYER;

    static {
        AnnotationPreferenceLookup lookup= EditorsUI.getAnnotationPreferenceLookup();
        INFO_LAYER= computeLayer("org.eclipse.wst.sse.ui.temp.info", lookup); //$NON-NLS-1$
        WARNING_LAYER= computeLayer("org.eclipse.wst.sse.ui.temp.warning", lookup); //$NON-NLS-1$
        ERROR_LAYER= computeLayer("org.eclipse.wst.sse.ui.temp.error", lookup); //$NON-NLS-1$
    }
    
    private static int computeLayer(String annotationType, AnnotationPreferenceLookup lookup) {
        Annotation annotation= new Annotation(annotationType, false, null);
        AnnotationPreference preference= lookup.getAnnotationPreference(annotation);
        if (preference != null)
            return preference.getPresentationLayer() + 1;
        else
            return IAnnotationAccessExtension.DEFAULT_LAYER + 1;
    }
    
    
	private Object fAdditionalFixInfo = null;

	private Object fKey = null;
	private Position fPosition = null;

	private int fProblemID;

    private int fLayer = DEFAULT_LAYER;
    
    private Image fImage = null;

	public TemporaryAnnotation(Position p, String type, String message, ReconcileAnnotationKey key) {
		super();
		fPosition = p;
		setType(type);
		fKey = key;
		setText(message);
        initLayer();
        initImage();
	}

	public TemporaryAnnotation(Position p, String type, String message, ReconcileAnnotationKey key, int problemId) {
		super();
		fPosition = p;
		fKey = key;
		setType(type);
		setText(message);
		fProblemID = problemId;
        initLayer();
        initImage();
	}

    private void initLayer() {
        
        String type = getType();
        if(type.equals(ANNOT_ERROR)) {
            fLayer = ERROR_LAYER;
        }
        else if(type.equals(ANNOT_WARNING)) {
            fLayer = WARNING_LAYER;
        }
        else if(type.equals(ANNOT_INFO)) {
            fLayer = INFO_LAYER;
        }
    }
    
    private void initImage() {
        // later we can add support for quick fix images.
        String type = getType();
        if(type.equals(ANNOT_ERROR)) {
            fImage = null;
        }
        else if(type.equals(ANNOT_WARNING)) {
            fImage = null;
        }
        else if(type.equals(ANNOT_INFO)) {
            fImage = null;
        }
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object obj) {
		// this check doesn't take into consideration that annotation
		// positions that change from a text edit before it
		// we should be checking if the annotation is still on the same line,
		// and the distance from the start of the line is the same
		if (obj instanceof TemporaryAnnotation) {

			TemporaryAnnotation ta = (TemporaryAnnotation) obj;

            boolean samePosition = ta.getPosition().equals(this.getPosition());
            boolean sameText = false;

            if(ta.getText() != null && this.getText() != null && ta.getText().equals(this.getText()))
                sameText = true;
            else if(ta.getText( )== null && this.getText() == null)
                sameText = true;
            
			return  sameText && samePosition;
		}
		return super.equals(obj);
	}

	/**
	 * Additional info required to fix this problem.
	 * 
	 * @return an Object that contains additional info on how to fix this
	 *         problem, or null if there is none
	 */
	public Object getAdditionalFixInfo() {
		return fAdditionalFixInfo;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.sse.ui.ITemporaryAnnotation#getDescription()
	 */
	public String getDescription() {
		return getText();
	}

	public Object getKey() {
		return fKey;
	}

	public Position getPosition() {
		return fPosition;
	}

	/**
	 * @return Returns the problemID.
	 */
	public int getProblemID() {
		return fProblemID;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.text.source.Annotation#isPersistent()
	 */
	public boolean isPersistent() {
		return false;
	}

	/**
	 * Sets additional information useful to fixing this problem.
	 * 
	 * @param an
	 *            Object that contains additional info on how to fix this
	 *            problem
	 */
	public void setAdditionalFixInfo(Object info) {
		fAdditionalFixInfo = info;
	}

    public int getLayer() {
        return fLayer;
    }
    
    /*
     * @see Annotation#paint
     */
    public void paint(GC gc, Canvas canvas, Rectangle r) {
        //initializeImages();
        if (fImage != null)
            ImageUtilities.drawImage(fImage, gc, canvas, r, SWT.CENTER, SWT.TOP);
    }
    
	public String toString() {
		return "" + fPosition.getOffset() + ':' + fPosition.getLength() + ": " + getText(); //$NON-NLS-1$ //$NON-NLS-2$
	}
}