const fs = require("fs");
const path = require("path");
const chai = require("chai");
const expect = chai.expect;
const mlog = require("mocha-logger");
const translations = require("../../translations/translations.js");
const helmet = require("helmet");
const {JSDOM} = require("jsdom");
const express = require("express");

describe("Translations", function() {
	let server;

	before(function() {
		const app = express();
		app.use(helmet());
		app.use(function (req, res, next) {
			res.header("Access-Control-Allow-Origin", "*");
			next();
		});
		app.use("/translations", express.static(path.join(__dirname, "..", "..", "translations")));

		server = app.listen(3000);
	});

	after(function() {
		server.close();
	});

	it("should have a translation file in the specified path", function() {
		for(let language in translations) {
			const file = fs.statSync(translations[language]);
			expect(file.isFile()).to.be.equal(true);
		}
	});

	const mmm = {
		name: "TranslationTest",
		file(file) {
			return `http://localhost:3000/${file}`;
		}
	};

	describe("Parsing language files through the Translator class", function() {
		for(let language in translations) {
			it(`should parse ${language}`, function(done) {
				const dom = new JSDOM(`<script>var translations = ${JSON.stringify(translations)}; var Log = {log: function(){}};</script>\
					<script src="${path.join(__dirname, "..", "..", "js", "translator.js")}">`, { runScripts: "dangerously",
					resources: "usable" });
				dom.window.onload = function() {
					const {Translator} = dom.window;

					Translator.load(mmm, translations[language], false, function() {
						expect(Translator.translations[mmm.name]).to.be.an("object");
						expect(Object.keys(Translator.translations[mmm.name]).length).to.be.at.least(1);
						done();
					});
				};
			});
		}
	});

	describe("Same keys", function() {
		let base;

		before(function(done) {
			const dom = new JSDOM(`<script>var translations = ${JSON.stringify(translations)}; var Log = {log: function(){}};</script>\
					<script src="${path.join(__dirname, "..", "..", "js", "translator.js")}">`, { runScripts: "dangerously",
				resources: "usable" });
			dom.window.onload = function() {
				const {Translator} = dom.window;

				Translator.load(mmm, translations.en, false, function() {
					base = Object.keys(Translator.translations[mmm.name]).sort();
					done();
				});
			};
		});

		for (let language in translations) {
			if (language === "en") {
				continue;
			}

			describe(`Translation keys of ${language}`, function() {
				let keys;

				before(function(done){
					const dom = new JSDOM(`<script>var translations = ${JSON.stringify(translations)}; var Log = {log: function(){}};</script>\
					<script src="${path.join(__dirname, "..", "..", "js", "translator.js")}">`, { runScripts: "dangerously",
						resources: "usable" });
					dom.window.onload = function() {
						const {Translator} = dom.window;

						Translator.load(mmm, translations[language], false, function() {
							keys = Object.keys(Translator.translations[mmm.name]).sort();
							done();
						});
					};
				});

				it(`${language} keys should be in base`, function() {
					keys.forEach(function(key) {
						expect(base.indexOf(key)).to.be.at.least(0);
					});
				});

				it(`${language} should contain all base keys`, function() {
					// TODO: when all translations are fixed, use
					// expect(keys).to.deep.equal(base);
					// instead of the try-catch-block

					try {
						expect(keys).to.deep.equal(base);
					} catch(e) {
						if (e instanceof chai.AssertionError) {
							const diff = base.filter(key => !keys.includes(key));
							mlog.pending(`Missing Translations for language ${language}: ${diff}`);
							this.skip();
						} else {
							throw e;
						}
					}
				})

			});
		}
	});
});