export module Layer {
    export interface OlWMTSLayerOptions {
        layerName: string;
        url: string;
        hdpi?: boolean;
        attribution?: string;
    }

    export const defaultResolutions: number[] = [8960, 4480, 2240, 1120, 560, 280, 140, 70, 28, 14, 7, 2.8, 1.4, 0.7, 0.28, 0.14, 0.07];

    /**
     * @param openlayers - e.g. window.ol
     * @param sourceOptions
     */
    export function olTileLayer(openlayers: any, sourceOptions: OlWMTSLayerOptions) {
        return new openlayers.layer.Tile({
            source: olTileWMTSSource(openlayers, sourceOptions)
        })
    }

    /**
     * @param openlayers - e.g. window.ol
     * @param options
     */
    export function olTileWMTSSource(openlayers: any, options: OlWMTSLayerOptions) {
        let projExtent = [274000, 3087000, 3327000, 7173000];

        let tileGrid = new openlayers.tilegrid.WMTS({
            origin: openlayers.extent.getTopLeft(projExtent),
            extent: projExtent,
            resolutions: defaultResolutions,
            matrixIds: ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16"]
        });

        let matrixSet = options.hdpi ? "NZTM2000HDPI" : "NZTM2000";
        return new openlayers.source.WMTS({
            tileGrid: tileGrid,
            projection: "EPSG:2193",
            url: options.url,
            format: 'jpeng',
            layer: options.layerName + (options.hdpi ? '-HDPI' : ''),
            style: 'default',
            tilePixelRatio: options.hdpi ? 2 : 1,
            matrixSet,
            // requestEncoding: "REST",
            attributions: options.attribution ? [
                new openlayers.Attribution({
                    html: options.attribution
                })
            ] : [],
        });
    }
}