/** 
 * Load Assets
 * @author Robert Strutts <Robert@TryingToScale.com>
 * @copyright Copyright (c) 2019, Robert Strutts.
 * @license https://mit-license.org/
 */

	tts.DoCacheAssets = true;

    var assets_loaded_once = [];

    tts.AddAssetCachedFile = function (full_file) {
        assets_loaded_once.push(full_file);
    };
    /**
     * Get an StyleSheet/Script
     * @param {Object} source - CSS/JavaScript File with Options
     * @param {Object} options - element to use, etc...
     * @returns {Promise}
     */
    tts.getAsset = (source, options) => {
        if (typeof options === "undefined") {
            options = {};
        }
        return new Promise((resolve, reject) => {
            var defaults_caching = tts.getValue(tts.DoCacheAssets, true);
            var file = source.name, kind = file.split('.').pop(), doCache = tts.getValue(source.useCache, defaults_caching);
            var full_file = tts.getValue(source.path, "") + file;
            var ts = tts.getValue(source.ts, "");
            var has_loaded = (assets_loaded_once.indexOf(full_file) === -1) ? false : true;
            if (has_loaded) {
                resolve("Already Loaded..." + full_file);
            } else {
                assets_loaded_once.push(full_file);
                switch (kind) {
                    case 'css':
                        var dataType = tts.getValue(source.dataType, "text/css"), style = document.createElement('style');
                        var elm = tts.getValue(options.element, document.getElementsByTagName('style')[0] || document.getElementsByTagName('head')[0]);
                        var loaded = tts.ajax(full_file, {dataType: "text/css", useCache: doCache, ts: ts});
                        loaded.then(function (code) {
                            style.type = dataType;
                            style.innerText = code;
                            elm.parentNode.insertBefore(style, elm.nextSibling);
                            setTimeout(function () {
                                resolve();
                            }, 12);
                        });
                        loaded.catch(function (e) {
                            reject(e);
                        });
                        break;
                    default:
                        var dataType = tts.getValue(source.dataType, "text/javascript");
                        var script = document.createElement('script');
                        var elm = tts.getValue(options.element, document.getElementsByTagName('script')[0] || document.getElementsByTagName('head')[0]);
                        var loaded = tts.ajax(full_file, {dataType: "text/javascript", useCache: doCache, ts: ts});
                        loaded.then(function (code) {
                            script.type = dataType;
                            script.text = code;
                            elm.parentNode.insertBefore(script, elm);
                            setTimeout(function () {
                                resolve();
                            }, 12);
                        });
                        loaded.catch(function (e) {
                            reject(e);
                        });
                        break;
                }
            }
        });
    };
    /** Useage: to combine options on each Asset for use with getMultiAssets.
     * Updates the sources Array/Objects with new data from Options.....as it is passed by Reference!!!
     * @param {Array of Objects} sources - CSS/JavaScript File with Options
     * @param {Array of Objects} options - path, useCache, dataType...
     */
    tts.mergeOptions = function (sources, options) {
        let keys = Object.keys(options);
        for (let key of keys) {
            for (var x = 0; x < sources.length; x++) {
                if (typeof sources[x][key] === 'undefined') {
                    sources[x][key] = options[key];
                }
            }
        }
    };
    /**
     * 
     * @param {Array of Objects} sources - CSS/JavaScript File with Options
     * @param {Object} options - element to apply to, etc...
     * @returns {Promise} - All done will all Files.
     */
    tts.getMultiAssets = (sources, options) => {
        if (typeof options === "undefined") {
            options = {};
        }
        var prArr = [];
        sources.forEach(function (source) {
            (function (source) {
                prArr.push(new Promise(function (resolve, reject) {
                    tts.getAsset(source, options).then(function () {
                        resolve();
                    }).catch(function (e) {
                        reject(e);
                    });
                }));
            })(source);
        });
        return Promise.all(prArr, function () {
            return true;
        });
    };

    /*
     * End of Assets
     */