/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

package org.grails.datastore.gorm.mongo;

import java.util.Collection;
import java.util.List;

import org.springframework.util.Assert;

import grails.mongodb.geo.Circle;
import org.grails.datastore.gorm.finders.MethodExpression;
import org.grails.datastore.mapping.mongo.query.MongoQuery;
import org.grails.datastore.mapping.query.Query.Criterion;

/**
 * A dynamic finder method expression that adds the ability to query within a circle
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class WithinCircle extends MethodExpression {

    public WithinCircle(Class<?> targetClass, String propertyName) {
        super(targetClass, propertyName);
    }

    @Override
    public Criterion createCriterion() {
        Object argument = arguments[0];
        if (argument instanceof Circle) {
            return new MongoQuery.WithinCircle(propertyName, ((Circle) argument).asList());
        }
        else {
            return new MongoQuery.WithinCircle(propertyName, (List<?>) argument);
        }
    }

    @Override
    public void setArguments(Object[] arguments) {
        Assert.isTrue(arguments.length > 0,
                "Only a list of elements is supported in a 'WithinCircle' query");

        Object arg = arguments[0];

        boolean isList = arg instanceof List;
        Assert.isTrue((isList || (arg instanceof Circle)),
                "Only a list of elements is supported in a 'withinBox' query");

        if (isList) {
            Collection<?> argument = (Collection<?>) arguments[0];
            Assert.isTrue(argument.size() == 2,
                    "A 'WithinCircle' query requires a two dimensional list of values");
        }

        super.setArguments(arguments);
    }
}
