/* Copyright (c) 2017 Environmental Systems Research Institute, Inc.
 * Apache-2.0 */
import { getScript, isLoaded, loadScript } from './script';
import utils from './utils/index';
// wrap Dojo's require() in a promise
function requireModules(modules) {
    return new utils.Promise(function (resolve, reject) {
        // If something goes wrong loading the esri/dojo scripts, reject with the error.
        var errorHandler = window['require'].on('error', reject);
        window['require'](modules, function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments[_i];
            }
            // remove error handler
            errorHandler.remove();
            // Resolve with the parameters from dojo require as an array.
            resolve(args);
        });
    });
}
// returns a promise that resolves with an array of the required modules
// also will attempt to lazy load the ArcGIS API if it has not already been loaded
export function loadModules(modules, loadScriptOptions) {
    if (loadScriptOptions === void 0) { loadScriptOptions = {}; }
    if (!isLoaded()) {
        // script is not yet loaded, is it in the process of loading?
        var script = getScript();
        var src = script && script.getAttribute('src');
        if (!loadScriptOptions.url && src) {
            // script is still loading and user did not specify a URL
            // in this case we want to default to the URL that's being loaded
            // instead of defaulting to the latest 4.x URL
            loadScriptOptions.url = src;
        }
        // attempt to load the script then load the modules
        return loadScript(loadScriptOptions).then(function () { return requireModules(modules); });
    }
    else {
        // script is already loaded, just load the modules
        return requireModules(modules);
    }
}