"use strict";

const path = require("path");
const expect = require("chai").expect;
const util = require("../util");
const Helper = require("../../src/helper");
const link = require("../../src/plugins/irc-events/link.js");

describe("Link plugin", function() {
	this.slow(200);

	let app;

	beforeEach(function(done) {
		app = util.createWebserver();
		app.get("/real-test-image.png", function(req, res) {
			res.sendFile(path.resolve(__dirname, "../../client/img/logo-grey-bg-120x120px.png"));
		});
		this.connection = app.listen(9002, done);

		this.irc = util.createClient();
		this.network = util.createNetwork();

		Helper.config.prefetchStorage = false;
	});

	afterEach(function(done) {
		this.connection.close(done);
	});

	it("should be able to fetch basic information about URLs", function(done) {
		const url = "http://localhost:9002/basic";
		const message = this.irc.createMessage({
			text: url,
		});

		link(this.irc, this.network.channels[0], message);

		expect(message.previews).to.deep.equal([{
			body: "",
			head: "",
			link: url,
			thumb: "",
			type: "loading",
			shown: true,
		}]);

		app.get("/basic", function(req, res) {
			res.send("<title>test title</title><meta name='description' content='simple description'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.type).to.equal("link");
			expect(data.preview.head).to.equal("test title");
			expect(data.preview.body).to.equal("simple description");
			expect(data.preview.link).to.equal(url);

			expect(message.previews).to.deep.equal([data.preview]);
			done();
		});
	});

	it("should prefer og:title over title", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/basic-og",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/basic-og", function(req, res) {
			res.send("<title>test</title><meta property='og:title' content='opengraph test'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.head).to.equal("opengraph test");
			done();
		});
	});

	it("should find only the first matching tag", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/duplicate-tags",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/duplicate-tags", function(req, res) {
			res.send("<title>test</title><title>magnifying glass icon</title><meta name='description' content='desc1'><meta name='description' content='desc2'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.head).to.equal("test");
			expect(data.preview.body).to.equal("desc1");
			done();
		});
	});

	it("should prefer og:description over description", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/description-og",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/description-og", function(req, res) {
			res.send("<meta name='description' content='simple description'><meta property='og:description' content='opengraph description'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.body).to.equal("opengraph description");
			done();
		});
	});

	it("should find og:image with full url", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/thumb",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/thumb", function(req, res) {
			res.send("<title>Google</title><meta property='og:image' content='http://localhost:9002/real-test-image.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.head).to.equal("Google");
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			done();
		});
	});

	it("should find image_src", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/thumb-image-src",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/thumb-image-src", function(req, res) {
			res.send("<link rel='image_src' href='http://localhost:9002/real-test-image.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			done();
		});
	});

	it("should correctly resolve relative protocol", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/thumb-image-src",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/thumb-image-src", function(req, res) {
			res.send("<link rel='image_src' href='//localhost:9002/real-test-image.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			done();
		});
	});

	it("should resolve url correctly for relative url", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/relative-thumb",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/relative-thumb", function(req, res) {
			res.send("<title>test relative image</title><meta property='og:image' content='/real-test-image.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			expect(data.preview.head).to.equal("test relative image");
			expect(data.preview.link).to.equal("http://localhost:9002/relative-thumb");
			done();
		});
	});

	it("should send untitled page if there is a thumbnail", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/thumb-no-title",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/thumb-no-title", function(req, res) {
			res.send("<meta property='og:image' content='http://localhost:9002/real-test-image.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.head).to.equal("Untitled page");
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			expect(data.preview.link).to.equal("http://localhost:9002/thumb-no-title");
			done();
		});
	});

	it("should not send thumbnail if image is 404", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/thumb-404",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/thumb-404", function(req, res) {
			res.send("<title>404 image</title><meta property='og:image' content='http://localhost:9002/this-image-does-not-exist.png'>");
		});

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.head).to.equal("404 image");
			expect(data.preview.link).to.equal("http://localhost:9002/thumb-404");
			expect(data.preview.thumb).to.be.empty;
			done();
		});
	});

	it("should send image preview", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/real-test-image.png",
		});

		link(this.irc, this.network.channels[0], message);

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.type).to.equal("image");
			expect(data.preview.link).to.equal("http://localhost:9002/real-test-image.png");
			expect(data.preview.thumb).to.equal("http://localhost:9002/real-test-image.png");
			done();
		});
	});

	it("should load multiple URLs found in messages", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/one http://localhost:9002/two",
		});

		link(this.irc, this.network.channels[0], message);

		expect(message.previews).to.eql([{
			body: "",
			head: "",
			link: "http://localhost:9002/one",
			thumb: "",
			type: "loading",
			shown: true,
		}, {
			body: "",
			head: "",
			link: "http://localhost:9002/two",
			thumb: "",
			type: "loading",
			shown: true,
		}]);

		app.get("/one", function(req, res) {
			res.send("<title>first title</title>");
		});

		app.get("/two", function(req, res) {
			res.send("<title>second title</title>");
		});

		const previews = [];

		this.irc.on("msg:preview", function(data) {
			if (data.preview.link === "http://localhost:9002/one") {
				expect(data.preview.head).to.equal("first title");
				previews[0] = data.preview;
			} else if (data.preview.link === "http://localhost:9002/two") {
				expect(data.preview.head).to.equal("second title");
				previews[1] = data.preview;
			}

			if (previews[0] && previews[1]) {
				expect(message.previews).to.eql(previews);
				done();
			}
		});
	});

	it("should use client's preferred language as Accept-Language header", function(done) {
		const language = "sv,en-GB;q=0.9,en;q=0.8";
		this.irc.config.browser.language = language;

		app.get("/language-check", function(req, res) {
			expect(req.headers["accept-language"]).to.equal(language);
			res.send();
			done();
		});

		const message = this.irc.createMessage({
			text: "http://localhost:9002/language-check",
		});

		link(this.irc, this.network.channels[0], message);
	});

	it("should send accept text/html for initial request", function(done) {
		app.get("/accept-header-html", function(req, res) {
			expect(req.headers.accept).to.equal("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
			res.send();
			done();
		});

		const message = this.irc.createMessage({
			text: "http://localhost:9002/accept-header-html",
		});

		link(this.irc, this.network.channels[0], message);
	});

	it("should send accept */* for meta image", function(done) {
		app.get("/accept-header-thumb", function(req, res) {
			res.send("<title>404 image</title><meta property='og:image' content='http://localhost:9002/accept-header-thumb.png'>");
		});

		app.get("/accept-header-thumb.png", function(req, res) {
			expect(req.headers.accept).to.equal("*/*");
			res.send();
			done();
		});

		const message = this.irc.createMessage({
			text: "http://localhost:9002/accept-header-thumb",
		});

		link(this.irc, this.network.channels[0], message);
	});

	it("should not add slash to url", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002",
		});

		link(this.irc, this.network.channels[0], message);

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.link).to.equal("http://localhost:9002");
			done();
		});
	});

	it("should work on non-ASCII urls", function(done) {
		const message = this.irc.createMessage({
			text:
			"http://localhost:9002/unicode/ıoı-test " +
			"http://localhost:9002/unicode/русский-текст-test " +
			"http://localhost:9002/unicode/🙈-emoji-test " +
			"http://localhost:9002/unicodeq/?q=ıoı-test " +
			"http://localhost:9002/unicodeq/?q=русский-текст-test " +
			"http://localhost:9002/unicodeq/?q=🙈-emoji-test",
		});

		link(this.irc, this.network.channels[0], message);

		app.get("/unicode/:q", function(req, res) {
			res.send(`<title>${req.params.q}</title>`);
		});

		app.get("/unicodeq/", function(req, res) {
			res.send(`<title>${req.query.q}</title>`);
		});

		const previews = [];

		this.irc.on("msg:preview", function(data) {
			previews.push(data.preview.link);

			if (data.preview.link.includes("ıoı-test")) {
				expect(data.preview.head).to.equal("ıoı-test");
			} else if (data.preview.link.includes("русский-текст-test")) {
				expect(data.preview.head).to.equal("русский-текст-test");
			} else if (data.preview.link.includes("🙈-emoji-test")) {
				expect(data.preview.head).to.equal("🙈-emoji-test");
			} else {
				expect("This should never happen").to.equal(data.preview.link);
			}

			if (previews.length === 5) {
				expect(message.previews.map((preview) => preview.link)).to.have.members(previews);
				done();
			}
		});
	});

	it("should fetch protocol-aware links", function(done) {
		const message = this.irc.createMessage({
			text: "//localhost:9002",
		});

		link(this.irc, this.network.channels[0], message);

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.link).to.equal("http://localhost:9002");
			done();
		});
	});

	it("should de-duplicate links", function(done) {
		const message = this.irc.createMessage({
			text: "//localhost:9002 http://localhost:9002 http://localhost:9002",
		});

		link(this.irc, this.network.channels[0], message);

		expect(message.previews).to.deep.equal([{
			type: "loading",
			head: "",
			body: "",
			thumb: "",
			link: "http://localhost:9002",
			shown: true,
		}]);

		this.irc.once("msg:preview", function(data) {
			expect(data.preview.link).to.equal("http://localhost:9002");
			done();
		});
	});

	it("should not try to fetch links with wrong protocol", function() {
		const message = this.irc.createMessage({
			text: "ssh://example.com ftp://example.com irc://example.com http:////////example.com",
		});

		expect(message.previews).to.be.empty;
	});

	it("should not try to fetch links with username or password", function() {
		const message = this.irc.createMessage({
			text: "http://root:'some%pass'@hostname/database http://a:%p@c http://a:%p@example.com http://test@example.com",
		});

		expect(message.previews).to.be.empty;
	});

	it("should fetch same link only once at the same time", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/basic-og-once",
		});

		let requests = 0;
		let responses = 0;

		this.irc.config.browser.language = "very nice language";

		link(this.irc, this.network.channels[0], message);
		link(this.irc, this.network.channels[0], message);
		process.nextTick(() => link(this.irc, this.network.channels[0], message));

		app.get("/basic-og-once", function(req, res) {
			requests++;

			expect(req.header("accept-language")).to.equal("very nice language");

			// delay the request so it doesn't resolve immediately
			setTimeout(() => {
				res.send("<title>test prefetch</title>");
			}, 100);
		});

		const cb = (data) => {
			responses++;

			expect(data.preview.head, "test prefetch");

			if (responses === 3) {
				this.irc.removeListener("msg:preview", cb);
				expect(requests).to.equal(1);
				done();
			}
		};

		this.irc.on("msg:preview", cb);
	});

	it("should fetch same link with different languages multiple times", function(done) {
		const message = this.irc.createMessage({
			text: "http://localhost:9002/basic-og-once-lang",
		});

		const requests = [];
		let responses = 0;

		this.irc.config.browser.language = "first language";
		link(this.irc, this.network.channels[0], message);

		setTimeout(() => {
			this.irc.config.browser.language = "second language";
			link(this.irc, this.network.channels[0], message);
		}, 100);

		app.get("/basic-og-once-lang", function(req, res) {
			requests.push(req.header("accept-language"));

			// delay the request so it doesn't resolve immediately
			setTimeout(() => {
				res.send("<title>test prefetch</title>");
			}, 100);
		});

		const cb = (data) => {
			responses++;

			expect(data.preview.head, "test prefetch");

			if (responses === 2) {
				this.irc.removeListener("msg:preview", cb);
				expect(requests).to.deep.equal([
					"first language",
					"second language",
				]);
				done();
			}
		};

		this.irc.on("msg:preview", cb);
	});
});