import { OHIF } from 'ohif-core';

function getWADORSImageUrl(instance, frame) {
    let wadorsuri = instance.wadorsuri;

    if (!wadorsuri) {
        return;
    }

    // We need to sum 1 because WADO-RS frame number is 1-based
    frame = (frame || 0) + 1;

    // Replaces /frame/1 by /frame/{frame}
    wadorsuri = wadorsuri.replace(/(%2Fframes%2F)(\d+)/, `$1${frame}`);

    return wadorsuri;
}

/**
 * Obtain an imageId for Cornerstone based on the WADO-RS scheme
 *
 * @param {object} instanceMetada metadata object (InstanceMetadata)
 * @returns {string} The imageId to be used by Cornerstone
 */
export function getWADORSImageId(instance, frame) {
    const uri = getWADORSImageUrl(instance, frame);

    if (!uri) {
        return;
    }

    return `wadors:${uri}`;
};