/*******************************************************************************
 * Copyright (c) 2005, 2008 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:
 *    John Camelon (IBM Rational Software) - Initial API and implementation
 *    Yuan Zhang / Beth Tibbitts (IBM Research)
 *    Markus Schorn (Wind River Systems)
 *******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.c;

import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.DOMException;
import org.eclipse.cdt.core.dom.ast.IASTCompletionContext;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclaration;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.ICompositeType;
import org.eclipse.cdt.core.dom.ast.IEnumeration;
import org.eclipse.cdt.core.dom.ast.ITypedef;
import org.eclipse.cdt.core.dom.ast.c.ICASTElaboratedTypeSpecifier;

/**
 * Node for elaborated type specifiers (examples: struct S; union U; enum E;)
 */
public class CASTElaboratedTypeSpecifier extends CASTBaseDeclSpecifier implements
        ICASTElaboratedTypeSpecifier, IASTCompletionContext {

    private int kind;
    private IASTName name;


    public CASTElaboratedTypeSpecifier() {
	}

	public CASTElaboratedTypeSpecifier(int kind, IASTName name) {
		this.kind = kind;
		setName(name);
	}

	public CASTElaboratedTypeSpecifier copy() {
		CASTElaboratedTypeSpecifier copy = new CASTElaboratedTypeSpecifier(kind, name == null ? null : name.copy());
		copyBaseDeclSpec(copy);
		return copy;
	}
	
	public int getKind() {
        return kind;
    }

    public void setKind(int value) {
        assertNotFrozen();
        this.kind = value;
    }

    public IASTName getName() {
        return name;
    }

    public void setName(IASTName name) {
        assertNotFrozen();
        this.name = name;
        if (name != null) {
			name.setParent(this);
			name.setPropertyInParent(TYPE_NAME);
		}
    }

    @Override
	public boolean accept( ASTVisitor action ){
        if( action.shouldVisitDeclSpecifiers ){
		    switch( action.visit( this ) ){
	            case ASTVisitor.PROCESS_ABORT : return false;
	            case ASTVisitor.PROCESS_SKIP  : return true;
	            default : break;
	        }
		}
        if( name != null ) if( !name.accept( action ) ) return false;
        if( action.shouldVisitDeclSpecifiers ){
		    switch( action.leave( this ) ){
	            case ASTVisitor.PROCESS_ABORT : return false;
	            case ASTVisitor.PROCESS_SKIP  : return true;
	            default : break;
	        }
		}
        return true;
    }

	public int getRoleForName(IASTName n ) {
		if( n != name ) return r_unclear;
		
		IASTNode parent = getParent();
		if( !( parent instanceof IASTDeclaration ) )
			return r_reference;
		
		if( parent instanceof IASTSimpleDeclaration ){
			IASTDeclarator [] dtors = ((IASTSimpleDeclaration)parent).getDeclarators(); 
			if( dtors.length == 0 )
				return r_declaration;
		}
		
		//can't tell, resolve the binding
		IBinding binding = name.resolveBinding();
		if( binding instanceof ICInternalBinding ){
			IASTNode node = ((ICInternalBinding)binding).getPhysicalNode();
			if( node == name ) 
				return r_declaration;
		}
		return r_reference;
	}

	public IBinding[] findBindings(IASTName n, boolean isPrefix) {
		IBinding[] result= CVisitor.findBindingsForContentAssist(n, isPrefix);
		int nextPos= 0;
		for (int i = 0; i < result.length; i++) {
			IBinding b= result[i];
			if (b instanceof ICompositeType) {
				ICompositeType ct= (ICompositeType) b;
				try {
					switch (ct.getKey()) {
					case ICompositeType.k_struct:
						if (getKind() != k_struct) 
							b= null;
						break;
					case ICompositeType.k_union:
						if (getKind() != k_union) 
							b= null;
						break;
					}
				} catch (DOMException e) {
					// ignore and propose binding
				}
			} else if (b instanceof IEnumeration) {
				if (getKind() != k_enum)
					b= null;
			} else if (b instanceof ITypedef) {
				b= null;
			}
			if (b != null) {
				result[nextPos++]= b;
			}
		}
		if (nextPos != result.length) {
			IBinding[] copy = new IBinding[nextPos];
			System.arraycopy(result, 0, copy, 0, nextPos);
			return copy;
		}
		return result;
	}
}
