DJCtrlEmu/main.js

const path = require("node:path");
const fs = require("node:fs");
const electron = require("electron");

let window;

let driver;
let mappings;

electron.app.on("ready", function () {
	window = new electron.BrowserWindow({
		"width": 1280,
		"height": 480,
		"backgroundColor": "#080C10FF",
		"title": "DJ Controller Emulator",
		"webPreferences": {
			"preload": path.join(__dirname, "preload.js")
		},
		"show": false
	});

	window.loadFile(path.join(__dirname, "view", "index.html"));

	window.once("ready-to-show", function () {
		window.show();
	});
});

electron.app.on("window-all-closed", function () {
	electron.app.quit();
});

electron.ipcMain.handle("load-driver", function (event, driverName) {
	if (driver) {
		driver.close();
		delete driver;
	}

	var driverPath = path.join(__dirname, "drivers", path.basename(driverName) + ".js");
	driver = require(driverPath);

	return true;
});

electron.ipcMain.handle("load-mappings", function (event, mappingsName) {
	if (mappings) {
		delete mappings;
	}

	var mappingsPath = path.join(__dirname, "mappings", path.basename(mappingsName) + ".json");
	mappings = JSON.parse(fs.readFileSync(mappingsPath));

	return true;
});

electron.ipcMain.handle("list-devices", function (event) {
	return driver.list();
});

electron.ipcMain.handle("open-device", function (event, name) {
	return driver.open(name, function (message) {
		var byteArray = new Array(...message);
		var hexStringifiedMessage = byteArray.map(b => b.toString(16)).map(c => ("00".substring(c.length) + c)).join(" ");

		for (var mappingRegExpString in mappings.inbound) {
			if (mappings.inbound.hasOwnProperty(mappingRegExpString)) {
				var mappingRegExp = new RegExp(mappingRegExpString);

				var mappingMatches = hexStringifiedMessage.match(mappingRegExp);
				if (!mappingMatches) continue;

				var mappingName = mappings.inbound[mappingRegExpString];

				mappingMatches.shift();

				var value = parseInt(mappingMatches[0], 16);

				window.webContents.send("signal", mappingName, value);
			}
		}
	});
});

electron.ipcMain.handle("control", function (event, name, value = 0x00) {
	if (!driver) return false;
	if (!mappings.outbound[name]) return false;

	var message = mappings.outbound[name].map(function (byte) {
		if (typeof byte != "number") {
			return value;
		} else {
			return byte;
		}
	});

	driver.send(message);
});

electron.ipcMain.handle("close-device", function (event) {
	return driver.close();
});