'use strict';

const createEventEmitter = require("create-event-emitter");

module.exports = function createSynchronizableAsset(initialUrl, initialVersion, initialPriority, initialMetadata) {
	let asset = createEventEmitter({
		sources: [],
		primarySource: initialSource,
		getUrl: function () {
			return this.primarySource.url;
		},
		getPrimarySource: function () {
			return this.primarySource;
		},
		addSource: function addSource(url, version, priority, metadata) {
			let newSource = {
				url: url,
				version: version,
				priority: priority,
				metadata: metadata
			};

			this.sources.push(newSource);

			if (this.primarySource == null || (version >= this.primarySource.version && priority > this.primarySource.priority)) {
				this.primarySource = newSource;
				this.emit("newPrimarySource", newSource);
			}
		}
	});

	asset.addSource(initialUrl, initialVersion, initialPriority, initialMetadata);

	return asset;
};