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

// FIXME: use type as key
var assetCss = '';
var assetCssUrl = '';
var assetCssHash = '';
var assetCssData = '';
var assetCssDataUrl = '';
var assetCssDataHash = '';
var assetJs = '';
var assetJsUrl = '';
var assetJsHash = '';

var plugin = (function () {
	
	var webAssets = [];
	
	var fetchResource = function(fetchEntry,cb) {
		fetch.fetchUrl(fetchEntry.url,function(err, meta, data) {
			if (err) {
				throw err;
			}
			debug('fetched url: '+fetchEntry.url+' length: '+meta.responseHeaders['content-length']);
			//debug('meta: '+JSON.stringify(meta));
			
			if (fetchEntry.type === 'css') {
				assetCss += '\n/* FILE: '+fetchEntry.url+' */\n';
				assetCss += data;
			} else if (fetchEntry.type === 'js') {
				assetJs += '\n/* FILE: '+fetchEntry.url+' */\n';
				assetJs += data;
			} else if (fetchEntry.type === 'dss') {
				assetCssData += '\n/* FILE: '+fetchEntry.url+' */\n';
				assetCssData += data;
			}
			cb();
		});
	};
	
	var fetchResources = function(fetchList, cb) {
		var startTime = new Date().getTime();
		debug('createResources: '+fetchList.length);
		var resourceStack = fetchList;
		var resourceLoader = function() {
			resourceStack = resourceStack.slice(1);
			if (resourceStack.length === 0) {
				debug('fetchResources done in '+(new Date().getTime()-startTime)+' ms.');
				cb();
			} else {
				fetchResource(resourceStack[0],resourceLoader);
			}
		};
		fetchResource(resourceStack[0],resourceLoader);
	};
	
	return function ServerConfigResourcesWebPlugin() {
		
		this.configPlugin = function (ctx) {
			ctx.key = 'serverConfigResourcesWeb';
			ctx.description = 'Exports client resources web.';
			ctx.localDir = __dirname;
			ctx.localConfigTemplate = 'config-resources-web.json';
		};
		
		this.configServer = function(ctx) {
			ctx.server.get(ctx.createSlugApiServerBase(),ctx.renderFunctionJSON(function () {
				return {
					resources: webAssets
				}
			}));
		};
		
		this.configPostBoot = function(ctx) {
			fetchResources(configRegistry.createClientResourceFetchList(), function() {
				assetJsHash = configUtil.stringHash(assetJs);
				assetCssHash = configUtil.stringHash(assetCss);
				assetCssDataHash = configUtil.stringHash(assetCssData);
				debug('Total size assets.js: '+assetJs.length+' hash: '+assetJsHash);
				debug('Total size assets.css: '+assetCss.length+' hash: '+assetCssHash);
				debug('Total size assets-data.css: '+assetCssData.length+' hash: '+assetCssDataHash);
				// note: js first to inject href asap by loader
				webAssets.push({
					url: assetJsUrl,
					type: 'js',
					hash: assetJsHash
				});
				webAssets.push({
					url: assetCssUrl,
					type: 'css',
					hash: assetCssHash
				});
				webAssets.push({
					url: assetCssDataUrl,
					type: 'dss',
					hash: assetCssDataHash
				});
			});
		}
	};
})();

var pluginDownload = (function () {
	
	return function ServerConfigResourcesWebAssetPlugin() {
		
		this.configPlugin = function (ctx) {
			ctx.key = 'serverConfigResourcesWebAsset';
			ctx.description = 'Exports downloaded client web resources.';
			ctx.dependencies.push('serverConfigResourcesWeb');
		};
		
		this.configServer = function(ctx) {

			assetCssDataUrl = ctx.createSlugApiPluginBase('assets-data.css');
			ctx.server.get(assetCssDataUrl,function (req, res, next) {
				res.set('Content-Type','text/css');
				res.write(assetCssData);
				res.end();
			});
			
			assetCssUrl = ctx.createSlugApiPluginBase('assets.css');
			ctx.server.get(assetCssUrl,function (req, res, next) {
				res.set('Content-Type','text/css');
				res.write(assetCss);
				res.end();
			});
			
			assetJsUrl = ctx.createSlugApiPluginBase('assets.js');
			ctx.server.get(assetJsUrl,function (req, res, next) {
				res.set('Content-Type','application/javascript');
				res.write(assetJs);
				res.end();
			});
		};
	};
})();

module.exports = {
	web: plugin,
	webAssets: pluginDownload
};