/*******************************************************************************
 * Copyright (c) 2012 Bruno Medeiros and other Contributors.
 * 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:
 *     Bruno Medeiros - initial API and implementation
 *******************************************************************************/
package dtool.ast.definitions;

import static melnorme.utilbox.core.Assert.AssertNamespace.assertNotNull;
import static melnorme.utilbox.core.Assert.AssertNamespace.assertTrue;
import melnorme.lang.tooling.ast.CommonASTNode;
import melnorme.lang.tooling.ast.IASTVisitor;
import melnorme.lang.tooling.ast.util.ASTCodePrinter;
import melnorme.lang.tooling.ast_actual.ASTNodeTypes;
import melnorme.lang.tooling.engine.PickedElement;
import melnorme.lang.tooling.engine.resolver.NamedElementSemantics;
import melnorme.lang.tooling.engine.resolver.VarSemantics;
import melnorme.lang.tooling.symbols.IConcreteNamedElement;
import dtool.ast.expressions.Expression;
import dtool.ast.references.Reference;

public class FunctionParameter extends DefUnit implements IFunctionParameter, IConcreteNamedElement {
	
	public final FnParameterAttributes paramAttribs;
	public final Reference type;
	public final Expression defaultValue;
	public final boolean isVariadic;
	
	public FunctionParameter(FnParameterAttributes paramAttribs, Reference type, DefSymbol defName, 
		Expression defaultValue, boolean isVariadic) {
		super(defName);
		this.paramAttribs = paramAttribs;
		this.type = parentize(assertNotNull(type));
		this.defaultValue = parentize(defaultValue);
		assertTrue(!isVariadic || defaultValue == null);
		this.isVariadic = isVariadic;
	}
	
	@Override
	public ASTNodeTypes getNodeType() {
		return ASTNodeTypes.FUNCTION_PARAMETER;
	}
	
	@Override
	public void visitChildren(IASTVisitor visitor) {
		acceptVisitor(visitor, type);
		acceptVisitor(visitor, defName);
		acceptVisitor(visitor, defaultValue);
	}
	
	@Override
	protected CommonASTNode doCloneTree() {
		return new FunctionParameter(paramAttribs, clone(type), clone(defName), clone(defaultValue), isVariadic);
	}
	
	@Override
	public void toStringAsCode(ASTCodePrinter cp) {
		paramAttribs.toStringAsCode(cp);
		cp.append(type, " ");
		cp.append(defName);
		cp.append(" = ", defaultValue);
		cp.append(isVariadic, "...");
	}
	
	@Override
	public boolean isVariadic() {
		return isVariadic;
	}
	
	@Override
	public EArcheType getArcheType() {
		return EArcheType.Variable;
	}
	
	@Override
	public String toStringForFunctionSignature(boolean includeName) {
		return getStringRepresentation(type, includeName ? getName() : null, isVariadic);
	}
	
	@Override
	public String getInitializerStringRepresentation() {
		if(defaultValue == null)
			return null;
		return defaultValue.toStringAsCode();
	}
	
	public static String getStringRepresentation(Reference type, String name, boolean isVariadic) {
		String nameStr = name == null ? "": " " + name;
		return type.toStringAsCode() + nameStr + (isVariadic ? "..." : "");
	}
	
	/* -----------------  ----------------- */
	
	@Override
	protected NamedElementSemantics doCreateSemantics(PickedElement<?> pickedElement) {
		return new VarSemantics(this, pickedElement) {
			@Override
			protected Reference getTypeReference() {
				return type;
			}
		};
	}
	
}