/*******************************************************************************
 * Copyright (c) 2001, 2007 Oracle 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:
 *     Oracle Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.jsf.common.util;

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

import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jst.jsf.common.JSFCommonPlugin;

/**
 * A writable version of the JDTBeanProperty object
 * 
 * This class may not be sub-classed by clients
 * 
 * @author cbateman
 *
 */
public class JDTBeanPropertyWorkingCopy extends JDTBeanProperty 
{
	private final List		_setters;
	
	/**
	 * the IMethod for the boolean "is" accessor method
	 */
	private IMethod        _isGetter;

	private final Map<String, String> _resolvedSignatureMap;
	
	/**
	 * @param type
	 * @param resolvedSignatureMap
	 */
	public JDTBeanPropertyWorkingCopy(IType type, Map<String, String> resolvedSignatureMap)
	{
		super(type);
		_setters = new ArrayList();
		_resolvedSignatureMap = resolvedSignatureMap;
	}
	/**
	 * Constructor
	 * @param type 
	 */
	public JDTBeanPropertyWorkingCopy(IType type)
	{
        super(type);
		_setters = new ArrayList();
		_resolvedSignatureMap = new HashMap<String, String>();
	}
	
	/**
	 * @return the bean properties spawned from this working copy
	 * Normally, there is only one property in the array, however,
	 * since this working copy represents all properties with the same
	 * name, there could be multiple properties since setters can
	 * be overloaded by name and could result in zero or one readable
	 * properties plus zero or more write-only properties with the same
	 * name.  I can't see anywhere in the spec that covers this 
	 * boundary case
	 */
	public JDTBeanProperty toValueObject()
	{
		// if the isGetter is present that it takes precedence
		// over the the normal getter
		IMethod  getter = getIsGetter() != null ? 
							getIsGetter() : getGetter();
		IMethod  matchedSetter = null;

		if (getter != null)
		{
			matchedSetter = determineMatchedSetter(getter);
		}
		// if there's no getter than pick any setter: there
		// are bigger problem when there's no getter than
		// ambiguous setters
		else if (_setters.size() > 0)
		{
			matchedSetter = (IMethod) _setters.get(0);
		}
		
		JDTBeanProperty beanProp = new JDTBeanProperty(_type);
		beanProp.setGetter(getter);
		beanProp.setSetter(matchedSetter);
		return beanProp;
		
	}
	
	private IMethod determineMatchedSetter(IMethod getter)
	{
		IMethod matchedSetter = null;
		
		// if there are no setters, there is no point in proceeding
		if (_setters.size() < 1)
		{
			return null;
		}

		try
		{
			final String getterSig = getResolvedSignature(_type, getter.getReturnType());
			FIND_MATCHING_SETTER:for 
				(final Iterator it = _setters.iterator(); it.hasNext();)
			{
				final IMethod  setter = (IMethod) it.next();
				assert (setter.getNumberOfParameters() == 1);
				final String paramSig = 
					getResolvedSignature
						(_type,setter.getParameterTypes()[0]);
				
				if (paramSig.equals(getterSig))
				{
					// we've found our match since only one
					// setter with the same name as the getter
					// can have the same matching type for a
					// single arg method
					matchedSetter = setter;
					break FIND_MATCHING_SETTER;
				}
			}
		}
		catch (JavaModelException jme)
		{
            JSFCommonPlugin.log(jme, "Error determining getter return type, bean properties analysis may be inaccurate"); //$NON-NLS-1$
		}

		return matchedSetter;
	}
	
	//@Override
	public void setGetter(IMethod getter) {
		super.setGetter(getter);
	}

	/**
	 * @param isGetter
	 */
	public void setIsGetter(IMethod isGetter) {
		_isGetter = isGetter;
	}

	/**
	 * @param setter
	 */
	public void addSetter(IMethod setter) {
        if (setter != null
                && setter.getNumberOfParameters() == 1)
        {
            _setters.add(setter);
        }
	}

    /**
     * Not supported on working copy.  This is synthetically generated
     * on toValueObject()
     * @return nothing; throws exception
     */
    public final IMethod getSetter()
    {
        throw new UnsupportedOperationException("Setter not calculated in working copy.  Call toValueObject().getSetter()"); //$NON-NLS-1$
    }
    
	/**
	 * @return the "is" getter method or null if not found
	 */
	public IMethod getIsGetter() {
		return _isGetter;
	}
	
	private String getResolvedSignature(final IType type, final String unresolved)
	{
		String resolved = _resolvedSignatureMap.get(unresolved);
		
		if (resolved == null)
		{
			resolved = TypeUtil.resolveTypeSignature(_type, unresolved);
			_resolvedSignatureMap.put(unresolved, resolved);
		}
		return resolved;
	}
}