/*******************************************************************************
 * Copyright (c) 2000, 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
 *******************************************************************************/

package org.eclipse.jdt.internal.ui.text.correction;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.Annotation;
import org.eclipse.jdt.core.dom.ArrayInitializer;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.MarkerAnnotation;
import org.eclipse.jdt.core.dom.MemberValuePair;
import org.eclipse.jdt.core.dom.Name;
import org.eclipse.jdt.core.dom.NormalAnnotation;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ListRewrite;

import org.eclipse.jdt.internal.ui.JavaPluginImages;

public class MissingAnnotationAttributesProposal extends LinkedCorrectionProposal {

	private Annotation fAnnotation;

	public MissingAnnotationAttributesProposal(ICompilationUnit cu, Annotation annotation, int relevance) {
		super(CorrectionMessages.MissingAnnotationAttributesProposal_add_missing_attributes_label, cu, null, relevance, null);
		setImage(JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE));

		fAnnotation= annotation;
		Assert.isNotNull(fAnnotation.resolveTypeBinding());
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jdt.internal.ui.text.correction.ASTRewriteCorrectionProposal#getRewrite()
	 */
	protected ASTRewrite getRewrite() throws CoreException {
		AST ast= fAnnotation.getAST();

		ASTRewrite rewrite= ASTRewrite.create(ast);
		createImportRewrite((CompilationUnit) fAnnotation.getRoot());
		
		ListRewrite listRewrite;
		if (fAnnotation instanceof NormalAnnotation) {
			listRewrite= rewrite.getListRewrite(fAnnotation, NormalAnnotation.VALUES_PROPERTY);
		} else {
			NormalAnnotation newAnnotation= ast.newNormalAnnotation();
			newAnnotation.setTypeName((Name) rewrite.createMoveTarget(fAnnotation.getTypeName()));
			rewrite.replace(fAnnotation, newAnnotation, null);
			
			listRewrite= rewrite.getListRewrite(newAnnotation, NormalAnnotation.VALUES_PROPERTY);
		}
		addMissingAtributes(fAnnotation.resolveTypeBinding(), listRewrite);
				
		return rewrite;
	}

	private void addMissingAtributes(ITypeBinding binding, ListRewrite listRewriter) {
		Set implementedAttribs= new HashSet();
		if (fAnnotation instanceof NormalAnnotation) {
			List list= ((NormalAnnotation) fAnnotation).values();
			for (int i= 0; i < list.size(); i++) {
				MemberValuePair curr= (MemberValuePair) list.get(i);
				implementedAttribs.add(curr.getName().getIdentifier());
			}
		} else {
			implementedAttribs.add("value"); //$NON-NLS-1$
		}
		ASTRewrite rewriter= listRewriter.getASTRewrite();
		AST ast= rewriter.getAST();
		
		IMethodBinding[] declaredMethods= binding.getDeclaredMethods();
		for (int i= 0; i < declaredMethods.length; i++) {
			IMethodBinding curr= declaredMethods[i];
			if (!implementedAttribs.contains(curr.getName()) && curr.getDefaultValue() == null) {
				MemberValuePair pair= ast.newMemberValuePair();
				pair.setName(ast.newSimpleName(curr.getName()));
				pair.setValue(newDefaultExpression(ast, curr.getReturnType()));
				listRewriter.insertLast(pair, null);
				
				addLinkedPosition(rewriter.track(pair.getName()), false, "val_name_" + i); //$NON-NLS-1$
				addLinkedPosition(rewriter.track(pair.getValue()), false, "val_type_" + i); //$NON-NLS-1$
			}
		}
	}
	
	private Expression newDefaultExpression(AST ast, ITypeBinding type) {
		if (type.isPrimitive()) {
			String name= type.getName();
			if ("boolean".equals(name)) { //$NON-NLS-1$
				return ast.newBooleanLiteral(false);
			} else {
				return ast.newNumberLiteral("0"); //$NON-NLS-1$
			}
		}
		if (type == ast.resolveWellKnownType("java.lang.String")) { //$NON-NLS-1$
			return ast.newStringLiteral();
		}
		if (type.isArray()) {
			ArrayInitializer initializer= ast.newArrayInitializer();
			initializer.expressions().add(newDefaultExpression(ast, type.getElementType()));
			return initializer;
		}
		if (type.isAnnotation()) {
			MarkerAnnotation annotation= ast.newMarkerAnnotation();
			annotation.setTypeName(ast.newName(getImportRewrite().addImport(type)));
			return annotation;
		}
		return ast.newNullLiteral();
	}
		

}