/*
 * (c) Copyright 2010-2011 AgileBirds
 *
 * This file is part of OpenFlexo.
 *
 * OpenFlexo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenFlexo 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openflexo.antar.expr;

import java.util.ArrayList;
import java.util.List;
import java.util.Vector;

public class BindingValueAsExpression extends Expression {

	public static abstract class AbstractBindingPathElement {
	}

	public static class NormalBindingPathElement extends AbstractBindingPathElement {
		public String property;

		public NormalBindingPathElement(String aProperty) {
			property = aProperty;
		}

		@Override
		public String toString() {
			return "Normal[" + property + "]";
		}

		@Override
		public boolean equals(Object obj) {
			if (obj instanceof NormalBindingPathElement) {
				NormalBindingPathElement e = (NormalBindingPathElement) obj;
				return property.equals(e.property);
			}
			return super.equals(obj);
		}
	}

	public static class MethodCallBindingPathElement extends AbstractBindingPathElement {
		public String method;
		public List<Expression> args;

		public MethodCallBindingPathElement(String aMethod, List<Expression> someArgs) {
			method = aMethod;
			args = someArgs;
		}

		@Override
		public String toString() {
			return "Call[" + method + "(" + args + ")" + "]";
		}

		@Override
		public boolean equals(Object obj) {
			if (obj instanceof MethodCallBindingPathElement) {
				MethodCallBindingPathElement e = (MethodCallBindingPathElement) obj;
				return method.equals(e.method) && args.equals(e.args);
			}
			return super.equals(obj);
		}

	}

	private List<AbstractBindingPathElement> bindingPath;

	public BindingValueAsExpression(List<AbstractBindingPathElement> aBindingPath) {
		super();
		this.bindingPath = aBindingPath;
	}

	@Override
	public int getDepth() {
		return 0;
	}

	public List<AbstractBindingPathElement> getBindingPath() {
		return bindingPath;
	}

	public boolean containsAMethodCall() {
		for (AbstractBindingPathElement e : getBindingPath()) {
			if (e instanceof MethodCallBindingPathElement) {
				return true;
			}
		}
		return false;
	}

	public boolean isSimpleVariable() {
		return getBindingPath().size() == 1 && getBindingPath().get(0) instanceof NormalBindingPathElement;
	}

	/*@Override
	public Expression evaluate(EvaluationContext context) throws TypeMismatchException {
		if (containsAMethodCall()) {
			ArrayList<AbstractBindingPathElement> newBindingPath = new ArrayList<AbstractBindingPathElement>();
			for (AbstractBindingPathElement e : getBindingPath()) {
				if (e instanceof NormalBindingPathElement) {
					newBindingPath.add(new NormalBindingPathElement(((NormalBindingPathElement) e).property));
				} else if (e instanceof MethodCallBindingPathElement) {
					ArrayList<Expression> newArgs = new ArrayList<Expression>();
					for (Expression arg : ((MethodCallBindingPathElement) e).args) {
						newArgs.add(arg.evaluate(context));
					}
					newBindingPath.add(new MethodCallBindingPathElement(((MethodCallBindingPathElement) e).method, newArgs));
				}
			}
			return new BindingValueAsExpression(newBindingPath);
		}
		return this;
	}*/

	@Override
	public Expression transform(ExpressionTransformer transformer) throws TransformException {

		ArrayList<AbstractBindingPathElement> newBindingPath = new ArrayList<AbstractBindingPathElement>();
		for (AbstractBindingPathElement e : getBindingPath()) {
			if (e instanceof NormalBindingPathElement) {
				newBindingPath.add(new NormalBindingPathElement(((NormalBindingPathElement) e).property));
			} else if (e instanceof MethodCallBindingPathElement) {
				ArrayList<Expression> newArgs = new ArrayList<Expression>();
				for (Expression arg : ((MethodCallBindingPathElement) e).args) {
					newArgs.add(arg.transform(transformer));
				}
				newBindingPath.add(new MethodCallBindingPathElement(((MethodCallBindingPathElement) e).method, newArgs));
			}
		}
		BindingValueAsExpression bv = new BindingValueAsExpression(newBindingPath);
		return transformer.performTransformation(bv);
	}

	@Override
	public EvaluationType getEvaluationType() {
		return EvaluationType.LITERAL;
	}

	@Override
	protected Vector<Expression> getChilds() {
		return null;
	}

	public boolean isValid() {
		return true;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof BindingValueAsExpression) {
			BindingValueAsExpression e = (BindingValueAsExpression) obj;
			return getBindingPath().equals(e.getBindingPath());
		}
		return super.equals(obj);
	}

}