const fs = require('fs');
const https = require('https');
const Robot = require('./robot/Robot');
const GCode = require('./robot/GCode');
const TelnetSender = require('./robot/TelnetSenderGRBL');

const initInputWS = require('./server/InputWS');
const createInfoServer = require('./server/InfoServer');

function loadHttpsOptions(fsModule) {
  try {
    return {
      enable: true,
      key: fsModule.readFileSync('https/localhost.key'),
      cert: fsModule.readFileSync('https/localhost.pem'),
      passphrase: 'abcd'
    };
  } catch (err) {
    throw new Error(`Failed to load HTTPS certificate/key: ${err.message}`);
  }
}

function getSenderConnectionStatus(senderInfo) {
  const { name, instance } = senderInfo;

  let status = 'disconnected';
  let reason = 'no active socket connection';

  if (instance?.getStatus) {
    const senderStatus = instance.getStatus();
    status = senderStatus.state || status;
    reason = senderStatus.state === 'disconnected' ? senderStatus.error || reason : undefined;
  } else if (instance?.isTestMode || instance?.tSocket) {
    status = 'connected';
    reason = undefined;
  }

  return { name, status, reason };
}

function createApp(options = {}) {
  const {
    fsModule = fs,
    httpsModule = https,
    processEnv = process.env,
    RobotClass = Robot,
    GCodeModule = GCode,
    TelnetSenderClass = TelnetSender,
    initInputWSFn = initInputWS,
    createInfoServerFn = createInfoServer,
    setTimeoutFn = setTimeout,
    consoleObj = console
  } = options;

  const startupStatus = {
    https: { ok: false, error: null },
    senders: []
  };

  let httpsOptions;
  try {
    httpsOptions = loadHttpsOptions(fsModule);
    startupStatus.https = { ok: true };
  } catch (err) {
    startupStatus.https = { ok: false, error: err.message };
    consoleObj.error(startupStatus.https.error);
    return { startupStatus };
  }

  const httpsServer = httpsModule.createServer(httpsOptions);

  const robot = new RobotClass(250, 264, 100);

  const sharedState = {
    connectedClients: [],
    lastCommands: [],
    lastPings: []
  };

  initInputWSFn(httpsServer, robot, GCodeModule, sharedState);

  const baseIP = processEnv.GRBL_BASE_IP ?? 'fluidNcBase.local';
  const elbowIP = processEnv.GRBL_ELLBOW_IP ?? 'fluidNcEllbow.local';
  const handIP = processEnv.GRBL_HAND_IP ?? 'fluidNcHand.local';

  const telnetSender1 = new TelnetSenderClass(baseIP, 2300, 'x', 'y', 'z');
  const telnetSender2 = new TelnetSenderClass(elbowIP, 5000, 'a', null, null);
  const telnetSender3 = new TelnetSenderClass(handIP, 5000, 'c', 'e', 'b');

  const senders = [
    { name: 'Base', instance: telnetSender1 },
    { name: 'Elbow', instance: telnetSender2 },
    { name: 'Hand', instance: telnetSender3 }
  ];

  startupStatus.senders = senders.map(getSenderConnectionStatus);
  const disconnectedSenders = startupStatus.senders.filter(s => s.status === 'disconnected');
  if (disconnectedSenders.length > 0) {
    consoleObj.warn(`Startup warning: ${disconnectedSenders.length} sender(s) disconnected at startup.`);
  }

  setTimeoutFn(() => {
    senders.forEach(s => {
      if (s.instance?.tSocket) robot.cmdReceivers.push(s.instance);
    });
  }, 5000);

  const port = Number(processEnv.PORT) || 2095;
  httpsServer.listen(port);
  consoleObj.log(`Input HTTPS/WebSocket on https://localhost:${port}`);

  const infoServer = createInfoServerFn(
    httpsOptions,
    sharedState,
    robot,
    GCodeModule,
    senders
  );

  const infoPort = 2098;
  infoServer.listen(infoPort);
  consoleObj.log(`Info server on https://localhost:${infoPort}`);

  return {
    httpsServer,
    infoServer,
    robot,
    senders: senders.map(s => s.instance),
    sharedState,
    httpsOptions,
    startupStatus
  };
}

if (require.main === module) {
  createApp();
}

module.exports = { createApp };