/*******************************************************************************
 * Copyright (c) 2009 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
 *     Zend Technologies
 *******************************************************************************/
package org.eclipse.php.internal.ui.corext.fix;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.ScriptElementLabels;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.text.link.LinkedModeModel;
import org.eclipse.jface.text.link.LinkedPosition;
import org.eclipse.php.core.ast.nodes.ITypeBinding;
import org.eclipse.php.internal.core.ast.rewrite.ITrackedNodePosition;
import org.eclipse.php.internal.ui.viewsupport.BindingLabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.text.edits.TextEdit;

public class LinkedProposalPositionGroup {

	/**
	 * {@link LinkedProposalPositionGroup.PositionInformation} describes a
	 * position insinde a position group. The information provided must be
	 * accurate after the document change to the proposal has been performed,
	 * but doesn't need to reflect the changed done by the linking mode.
	 */
	public static abstract class PositionInformation {
		public abstract int getOffset();

		public abstract int getLength();

		public abstract int getSequenceRank();
	}

	public static class Proposal {

		private String fDisplayString;
		private Image fImage;
		private int fRelevance;

		public Proposal(String displayString, Image image, int relevance) {
			fDisplayString = displayString;
			fImage = image;
			fRelevance = relevance;
		}

		public String getDisplayString() {
			return fDisplayString;
		}

		public Image getImage() {
			return fImage;
		}

		public int getRelevance() {
			return fRelevance;
		}

		public void setImage(Image image) {
			fImage = image;
		}

		public String getAdditionalProposalInfo() {
			return null;
		}

		public TextEdit computeEdits(int offset, LinkedPosition position, char trigger, int stateMask,
				LinkedModeModel model) throws CoreException {
			return new ReplaceEdit(position.getOffset(), position.getLength(), fDisplayString);
		}
	}

	public static PositionInformation createPositionInformation(ITrackedNodePosition pos, boolean isFirst) {
		return new TrackedNodePosition(pos, isFirst);
	}

	private static class TrackedNodePosition extends PositionInformation {

		private final ITrackedNodePosition fPos;
		private final boolean fIsFirst;

		public TrackedNodePosition(ITrackedNodePosition pos, boolean isFirst) {
			fPos = pos;
			fIsFirst = isFirst;
		}

		@Override
		public int getOffset() {
			return fPos.getStartPosition();
		}

		@Override
		public int getLength() {
			return fPos.getLength();
		}

		@Override
		public int getSequenceRank() {
			return fIsFirst ? 0 : 1;
		}
	}

	private static final class JavaLinkedModeProposal extends Proposal {
		private final ITypeBinding fTypeProposal;
		private final ISourceModule fCompilationUnit;

		public JavaLinkedModeProposal(ISourceModule unit, ITypeBinding typeProposal, int relevance) {
			super(BindingLabelProvider.getBindingLabel(typeProposal,
					ScriptElementLabels.ALL_DEFAULT | ScriptElementLabels.ALL_POST_QUALIFIED), null, relevance);
			fTypeProposal = typeProposal;
			fCompilationUnit = unit;
			ImageDescriptor desc = BindingLabelProvider.getBindingImageDescriptor(fTypeProposal,
					BindingLabelProvider.DEFAULT_IMAGEFLAGS);
			if (desc != null) {
				setImage(DLTKUIPlugin.getImageDescriptorRegistry().get(desc));
			}
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jdt.internal.corext.fix.PositionGroup.Proposal#
		 * computeEdits (int, org.eclipse.jface.text.link.LinkedPosition, char,
		 * int, org.eclipse.jface.text.link.LinkedModeModel)
		 */
		@Override
		public TextEdit computeEdits(int offset, LinkedPosition position, char trigger, int stateMask,
				LinkedModeModel model) throws CoreException {
			// ImportRewrite impRewrite=
			// StubUtility.createImportRewrite(fCompilationUnit, true);
			// String replaceString= impRewrite.addImport(fTypeProposal);

			MultiTextEdit composedEdit = new MultiTextEdit();
			// composedEdit.addChild(new ReplaceEdit(position.getOffset(),
			// position.getLength(), replaceString));
			// composedEdit.addChild(impRewrite.rewriteImports(null));
			return composedEdit;
		}
	}

	private final String fGroupId;
	private final List<PositionInformation> fPositions;
	private final List<Proposal> fProposals;

	public LinkedProposalPositionGroup(String groupID) {
		fGroupId = groupID;
		fPositions = new ArrayList<>();
		fProposals = new ArrayList<>();
	}

	public void addPosition(PositionInformation position) {
		fPositions.add(position);
	}

	public void addProposal(Proposal proposal) {
		fProposals.add(proposal);
	}

	public void addPosition(ITrackedNodePosition position, boolean isFirst) {
		addPosition(createPositionInformation(position, isFirst));
	}

	public void addProposal(String displayString, Image image, int relevance) {
		addProposal(new Proposal(displayString, image, relevance));
	}

	public void addProposal(ITypeBinding type, ISourceModule cu, int relevance) {
		addProposal(new JavaLinkedModeProposal(cu, type, relevance));
	}

	public String getGroupId() {
		return fGroupId;
	}

	public PositionInformation[] getPositions() {
		return (PositionInformation[]) fPositions.toArray(new PositionInformation[fPositions.size()]);
	}

	public Proposal[] getProposals() {
		return (Proposal[]) fProposals.toArray(new Proposal[fProposals.size()]);
	}

}