/**
 * Copyright (c) 2014, the Railo Company Ltd.
 * Copyright (c) 2015, Lucee Assosication Switzerland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package lucee.transformer.bytecode.expression.var;

import lucee.runtime.type.scope.Scope;
import lucee.transformer.TransformerException;
import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.expression.ExpressionBase;
import lucee.transformer.bytecode.util.TypeScope;
import lucee.transformer.bytecode.util.Types;
import lucee.transformer.expression.var.DataMember;
import lucee.transformer.expression.var.Variable;

import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;

public final class VariableRef extends ExpressionBase {

	
	private VariableImpl variable;

	private final boolean alwaysLocal;

	// Object touch (Object,Key)
    private final static Method TOUCH_KEY =  new Method("touch",
			Types.OBJECT,
			new Type[]{Types.OBJECT,Types.COLLECTION_KEY});
    // lucee.runtime.type.ref.Reference getReference (Object,Key)
    private final static Method GET_REFERENCE_KEY =  new Method("getReference",
			Types.REFERENCE,
			new Type[]{Types.OBJECT,Types.COLLECTION_KEY});

	public VariableRef(Variable variable, boolean alwaysLocal) {
		super(variable.getFactory(),variable.getStart(),variable.getEnd());
		this.variable=(VariableImpl)variable;
		this.alwaysLocal=alwaysLocal;
	}

	/**
	 *
	 * @see lucee.transformer.bytecode.expression.ExpressionBase#_writeOut(org.objectweb.asm.commons.GeneratorAdapter, int)
	 */
	@Override
	public Type _writeOut(BytecodeContext bc, int mode) throws TransformerException {
		GeneratorAdapter adapter = bc.getAdapter();
		int count=variable.countFM+variable.countDM;
		
		for(int i=0;i<=count;i++) {
    		adapter.loadArg(0);
		}
		
		int scope = variable.getScope();
		if(alwaysLocal && scope==Scope.SCOPE_UNDEFINED) scope=TypeScope.SCOPE_UNDEFINED_LOCAL;
		TypeScope.invokeScope(adapter, scope);
		
		boolean isLast;
		for(int i=0;i<count;i++) {
			isLast=(i+1)==count;
			getFactory().registerKey(bc,((DataMember)variable.members.get(i)).getName(),false);
			adapter.invokeVirtual(Types.PAGE_CONTEXT,isLast?GET_REFERENCE_KEY:TOUCH_KEY);
		}
		return Types.REFERENCE;
	}
}