const RasterAggregation = require('./raster-aggregation');
const VectorAggregation = require('./vector-aggregation');
const RASTER_AGGREGATION = 'RasterAggregation';
const VECTOR_AGGREGATION = 'VectorAggregation';

module.exports = class AggregationProxy {
    constructor (mapconfig, { resolution = 256, threshold = 10e5, placement = 'centroid', columns = {}} = {}) {
        this.mapconfig = mapconfig;
        this.resolution = resolution;
        this.threshold = threshold;
        this.placement = placement;
        this.columns = columns;
        this.implementation = this._getAggregationImplementation();
    }

    _getAggregationImplementation () {
        let implementation = null;

        switch (this._getAggregationType()) {
            case VECTOR_AGGREGATION:
                implementation = new VectorAggregation(this.resolution, this.threshold, this.placement, this.columns);
                break;
            case RASTER_AGGREGATION:
                implementation = new RasterAggregation(this.resolution, this.threshold, this.placement, this.columns);
                break;
            default:
                throw new Error('Unsupported aggregation type');
        }

        return implementation;
    }

    _getAggregationType () {
        if (this.mapconfig.isVectorOnlyMapConfig()) {
            return VECTOR_AGGREGATION;
        }

        return RASTER_AGGREGATION;
    }

    sql (options) {
        return this.implementation.sql(options);
    }
};