var emu = require("./js/emulate");
var ipc = require("./js/ipc");
var shell = require("./js/shell");
var udev = require("./udev");
var pathlib = require("path");
var fs = require("fs");

var mountdir = "/tmp/emuboy.mnt"

process.on("unhandledRejection", evt => {
	console.trace(evt);
	process.exit(1);
});

var rompath = mountdir+"/roms";

var games = [];

function updateGames() {
	if (driveMounted) {
		var rx = /\.(gba|gbc|nds)$/;
		fs.readdir(rompath, (err, list) => {
			if (err)
				throw err;

			games = list.filter(x => rx.test(x));
			ipc.sendGameList(games);
		});
	} else {
		games = [];
		ipc.sendGameList(games);
	}
}

var driveMounted = false;
async function onblock(evt) {
	if (evt.DEVTYPE !== "partition")
		return;
	if (evt.PARTN !== "1")
		return;
	if (evt.ID_BUS !== "usb")
		return;

	if (!evt.ACTION || evt.ACTION === "add") {
		await shell.safe("mkdir", "-p", mountdir);
		if (await shell("mountpoint", "-q", mountdir) === 0)
			await shell.safe("sudo", "umount", mountdir);
		await shell.safe(
			"sudo", "mount", "-o", "uid="+process.env.USER,
			evt.DEVNAME, mountdir);
		await shell.safe("mkdir", "-p", rompath);
		driveMounted = true;
		updateGames();
	} else if (evt.ACTION === "remove") {
		driveMounted = false;
		console.log("Unmounted drive", evt.DEVNAME);
		updateGames();
	}
}
udev.init();
udev.monitor("block", onblock);
udev.list("block", x => x.forEach(onblock));

ipc.init(8085, () => {
	console.log("Server started");

	ipc.on("run", async function(name) {
		try {
			ipc.sendGameStart();
			await emu.run(pathlib.join(rompath, name));
		} catch (err) {
			ipc.error(err.toString());
			console.trace(err);
		}
		ipc.sendGameStopped();
	});

	ipc.on("connection", () => {
		updateGames();
	});
});