/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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
 *
 *    http://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.elasticsearch.common.geo.builders;

import com.spatial4j.core.shape.Shape;
import org.elasticsearch.common.geo.XShapeCollection;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.xcontent.XContentBuilder;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class GeometryCollectionBuilder extends ShapeBuilder {
    
    public static final GeoShapeType TYPE = GeoShapeType.GEOMETRYCOLLECTION;

    protected final ArrayList<ShapeBuilder> shapes = new ArrayList<>();

    public GeometryCollectionBuilder() {
        this(Orientation.RIGHT);
    }

    public GeometryCollectionBuilder(Orientation orientation) {
        super(orientation);
    }

    public GeometryCollectionBuilder shape(ShapeBuilder shape) {
        this.shapes.add(shape);
        return this;
    }
    
    public GeometryCollectionBuilder point(PointBuilder point) {
        this.shapes.add(point);
        return this;
    }
    
    public GeometryCollectionBuilder multiPoint(MultiPointBuilder multiPoint) {
        this.shapes.add(multiPoint);
        return this;
    }
    
    public GeometryCollectionBuilder line(BaseLineStringBuilder<?> line) {
        this.shapes.add(line);
        return this;
    }
    
    public GeometryCollectionBuilder multiLine(MultiLineStringBuilder multiLine) {
        this.shapes.add(multiLine);
        return this;
    }
    
    public GeometryCollectionBuilder polygon(BasePolygonBuilder<?> polygon) {
        this.shapes.add(polygon);
        return this;
    }
    
    public GeometryCollectionBuilder multiPolygon(MultiPolygonBuilder multiPolygon) {
        this.shapes.add(multiPolygon);
        return this;
    }
    
    public GeometryCollectionBuilder envelope(EnvelopeBuilder envelope) {
        this.shapes.add(envelope);
        return this;
    }
    
    public GeometryCollectionBuilder circle(CircleBuilder circle) {
        this.shapes.add(circle);
        return this;
    }

    public ShapeBuilder getShapeAt(int i) {
        if (i >= this.shapes.size() || i < 0) {
            throw new ElasticsearchException("GeometryCollection contains " + this.shapes.size() + " shapes. + " +
                    "No shape found at index " + i);
        }
        return this.shapes.get(i);
    }

    public int numShapes() {
        return this.shapes.size();
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        builder.field(FIELD_TYPE, TYPE.shapename);
        builder.startArray(FIELD_GEOMETRIES);
        for (ShapeBuilder shape : shapes) {
            shape.toXContent(builder, params);
        }
        builder.endArray();
        return builder.endObject();
    }

    @Override
    public GeoShapeType type() {
        return TYPE;
    }

    @Override
    public Shape build() {

        List<Shape> shapes = new ArrayList<>(this.shapes.size());
        
        for (ShapeBuilder shape : this.shapes) {
            shapes.add(shape.build());
        }
            
        if (shapes.size() == 1)
            return shapes.get(0);
        else
            return new XShapeCollection<>(shapes, SPATIAL_CONTEXT);
        //note: ShapeCollection is probably faster than a Multi* geom.
    }

}
