const fs = require("fs");
const path = require("path");
const { app, dialog, ipcMain } = require("electron");

const Emitter = require("events");
const events = new Emitter();

const cli = require("./cli");
const lang = require("./lang");
const requests = require("./requests");

const unzip = require("unzipper");
const exec = require("child_process").spawn;
const { https } = require("follow-redirects");

process.chdir(app.getPath("appData"));

var settings = {
	gamepath: "",
	lang: "en-US",
	autoupdate: true,
	zip: "/northstar.zip",
	excludes: [
		"ns_startup_args.txt",
		"ns_startup_args_dedi.txt"
	]
}

if (fs.existsSync("viper.json")) {
	settings = {...settings, ...JSON.parse(fs.readFileSync("viper.json", "utf8"))};
	settings.zip = path.join(settings.gamepath + "/northstar.zip");
} else {
	console.log(lang("general.missingpath"));
}

function setpath(win) {
	if (! win) {
		settings.gamepath = cli.param("setpath");
	} else {
		dialog.showOpenDialog({properties: ["openDirectory"]}).then(res => {
			if (res.canceled) {
				ipcMain.emit("newpath", null, false);
				return;
			}
			settings.gamepath = res.filePaths[0];
			settings.zip = path.join(settings.gamepath + "/northstar.zip");
			saveSettings();
			win.webContents.send("newpath", settings.gamepath);
			ipcMain.emit("newpath", null, settings.gamepath);
		}).catch(err => {console.error(err)})
	}

	fs.writeFileSync(app.getPath("appData") + "/viper.json", JSON.stringify(settings));
	cli.exit();
}

function saveSettings() {
	fs.writeFileSync(app.getPath("appData") + "/viper.json", JSON.stringify(settings));
}

function getNSVersion() {
	var versionFilePath = path.join(settings.gamepath, "ns_version.txt");

	if (fs.existsSync(versionFilePath)) {
		return fs.readFileSync(versionFilePath, "utf8");
	} else {
		fs.writeFileSync(versionFilePath, "unknown");
		return "unknown";
	}
}

async function update() {
	for (let i = 0; i < settings.excludes.length; i++) {
		let exclude = path.join(settings.gamepath + "/" + settings.excludes[i]);
		if (fs.existsSync(exclude)) {
			fs.renameSync(exclude, exclude + ".excluded")
		}
	}

	ipcMain.emit("ns-updating");
	console.log(lang("cli.update.checking"));
	var version = getNSVersion();

	const latestAvailableVersion = await requests.getLatestNsVersion();

	if (version === latestAvailableVersion) {
		ipcMain.emit("ns-updated");
		console.log(lang("cli.update.uptodate"), version);

		winLog(lang("gui.update.uptodate"));
		return;
	} else {
		if (version != "unknown") {
			console.log(lang("cli.update.current"), version);
		}; console.log(lang("cli.update.downloading") + ":", latestAvailableVersion);

		winLog(lang("gui.update.downloading"));
	}

	https.get(requests.getLatestNsVersionLink(), (res) => {
		let stream = fs.createWriteStream(settings.zip);
		res.pipe(stream);

		let received = 0;
		res.on("data", (chunk) => {
			received += chunk.length;
			winLog(lang("gui.update.downloading") + " " + (received / 1024 / 1024).toFixed(1) + "mb");
		})

		stream.on("finish", () => {
			stream.close();
			winLog(lang("gui.update.extracting"));
			console.log(lang("cli.update.downloaddone"));
			fs.createReadStream(settings.zip).pipe(unzip.Extract({path: settings.gamepath}))
			.on("finish", () => {
				fs.writeFileSync(path.join(settings.gamepath, "ns_version.txt"), latestAvailableVersion);
				ipcMain.emit("getversion");

				for (let i = 0; i < settings.excludes.length; i++) {
					let exclude = path.join(settings.gamepath + "/" + settings.excludes[i]);
					if (fs.existsSync(exclude + ".excluded")) {
						fs.renameSync(exclude + ".excluded", exclude)
					}
				}

				ipcMain.emit("ns-updated");
				winLog(lang("gui.update.finished"));
				console.log(lang("cli.update.finished"));
				cli.exit();
			});
		})
	})
}

function updatevp(autoinstall) {
	const { autoUpdater } = require("electron-updater");

	if (autoinstall) {
		autoUpdater.on("update-downloaded", (info) => {
			autoUpdater.quitAndInstall();
		});
	}

	autoUpdater.on("error", (info) => {cli.exit(1)});
	autoUpdater.on("update-not-available", (info) => {cli.exit()});

	autoUpdater.checkForUpdatesAndNotify();
}

function launch(version) {
	if (process.platform == "linux") {
		console.error("error:", lang("cli.launch.linuxerror"))
		cli.exit(1);
	}

	process.chdir(settings.gamepath);
	switch(version) {
		case "vanilla":
			console.log(lang("general.launching"), "Vanilla...")
			exec(path.join(settings.gamepath + "/Titanfall2.exe"))
			break;
		default:
			console.log(lang("general.launching"), "Northstar...")
			exec(path.join(settings.gamepath + "/NorthstarLauncher.exe"))
			break;
	}
}

function winLog(msg) {
	ipcMain.emit("winLog", msg, msg);
}

module.exports = {
	winLog,
	launch,
	update,
	setpath,
	updatevp,
	settings,
	getNSVersion,
	setlang: (lang) => {
		settings.lang = lang;
		saveSettings();
	},
}