#!/usr/bin/env node

const fs = require("fs");

var electronPath = require("electron");

const net = require("net");

var buffer = [];

var electronWindowOpened = false;

var socket;

net.createServer((s) => {

socket = s;

const pythonLineStream = byline.createStream(socket);

pythonLineStream.on("data", line => {

line = line.toString();

if (!line.length) return;

if (electronWindowOpened) {

electronProcess.send(line);

} else {

buffer.push(line);

}

});

}).listen(4387)

const { spawn } = require("child_process");

const byline = require("byline")

var args = process.argv.slice(2)

if (!args.length) {

console.log("Usage: livepython [program] [..args]")

process.exit()

}

args.unshift(__dirname + "/../tracer.py")

const electronProcess = spawn(electronPath, [__dirname + "/../"], {

stdio: ["pipe", "pipe", "pipe", "ipc"]

})

const pythonProcess = spawn("python", args);

pythonProcess.stdout.on("data", data => {

process.stdout.write(data.toString());

});

pythonProcess.stderr.on("data", data => {

process.stdout.write(data.toString())

})

pythonProcess.on("exit", (code) => {

if (code !== 0) {

electronProcess.kill('SIGINT')

process.exit();

}

})

electronProcess.on("message", msg => {

if (msg.type === 'connected') {

electronWindowOpened = true;

buffer.forEach(msg => {

electronProcess.send(msg);

});

} else if (msg.type === "toggle_running_state") {

if (msg.value) {

pythonProcess.kill("SIGSTOP")

} else {

pythonProcess.kill("SIGCONT");

}

} else {

socket.write(JSON.stringify(msg))

}

})

function killSubprocesses (e) {

// console.log(e.toString())

electronProcess.kill("SIGINT")

pythonProcess.kill("SIGINT")

}

process.on('exit', killSubprocesses)

process.on('SIGINT', killSubprocesses)

process.on("SIGUSR1", killSubprocesses)

process.on("SIGUSR2", killSubprocesses)

process.on("uncaughtException", killSubprocesses)