var debug            = require('debug')('ff:tcrud:plugin:server:config:resouces:mobile');
var configRegistry   = require('./../../../config-registry');
var configUtil       = require('./../../../config-util');
var fetch            = require('fetch');

module.exports = (function () {
	
	var webAssets = [];
	
	var fetchHashResource = function(fetchEntry,cb) {
		fetch.fetchUrl(fetchEntry.url,function(err, meta, data) {
			debug('fetched url: '+fetchEntry.url+' length: '+meta.responseHeaders['content-length']);
			var assetHash = configUtil.stringHash(''+data);
			webAssets.push({
				url: fetchEntry.url,
				type: fetchEntry.type,
				hash: assetHash
			});
			cb();
		});
	};
	
	var fetchHashResources = function(fetchList, cb) {
		var startTime = new Date().getTime();
		debug('createHashResources: '+fetchList.length);
		var resourceStack = fetchList;
		var resourceLoader = function() {
			resourceStack = resourceStack.slice(1);
			if (resourceStack.length === 0) {
				debug('fetchHashResources done in '+(new Date().getTime()-startTime)+' ms.');
				cb();
			} else {
				fetchHashResource(resourceStack[0],resourceLoader);
			}
		};
		fetchHashResource(resourceStack[0],resourceLoader);
	};
	
	return function ServerConfigResourcesMobilePlugin() {
		
		this.configPlugin = function (ctx) {
			ctx.key = 'serverConfigResourcesMobile';
			ctx.description = 'Exports client resources mobile.';
			ctx.localDir = __dirname;
			ctx.localConfigTemplate = 'config-resources-mobile.json';
		};
		
		this.configServer = function(ctx) {
			ctx.server.get(ctx.createSlugApiServerBase(),ctx.renderFunctionJSON(function () {
				return {
					resources: webAssets
				}
			}));
		};
		
		this.configPostBoot = function(ctx) {
			fetchHashResources(configRegistry.createClientResourceFetchList(), function() {
				debug('Total assets build: '+webAssets.length);
			});
		}
	};
})();