var shell = require("./shell");
var pathlib = require("path");
var os = require("os");
var fs = require("fs");
var EventEmitter = require("events");

exports.run = run;

// Reset to default config
async function cpconf(from, to) {
	to = pathlib.join(os.homedir(), to);
	from = pathlib.join("emuconf", from);
	await shell.safe("rm", "-rf", "--", to);
	await shell.safe("cp", "-r", "--", from, to);
}

async function run_visualboy(path, saves) {
	await cpconf("vbam", ".vbam");
	await shell.safe("vbam", "-F", path);
}

async function run_desmume(path, saves) {
	await cpconf("desmume", ".config/desmume");
	await shell.safe("desmume", path);
}

var emus = {
	nds: run_desmume,
	gba: run_visualboy,
	gbc: run_visualboy,
};

async function run(path, cb) {
	var ext = pathlib.extname(path).substr(1);

	var fn = emus[ext];
	if (!fn)
		throw new Error("Can't run games with extension "+ext+".");

	shell.safe("mkdir", "-p", "--", path+".save");
	await fn(path, path+".save");
}