const tcpPortUsed = require('tcp-port-used');
const { PlebbitWsServer } = require('@plebbit/plebbit-js/rpc');
const path = require('path');
const envPaths = require('env-paths').default('plebbit', { suffix: false });
const { randomBytes } = require('crypto');
const fs = require('fs-extra');

let isDev = true;
try {
  isDev = require('electron-is-dev');
} catch (e) {}

//           PLEB, always run plebbit rpc on this port so all clients can use it
const port = 9138;
const defaultPlebbitOptions = {
  // find the user's OS data path
  dataPath: !isDev ? envPaths.data : path.join(__dirname, '..', '.plebbit'),
  ipfsHttpClientsOptions: ['http://localhost:5001/api/v0'],
  // TODO: having to define pubsubHttpClientsOptions and ipfsHttpClientsOptions is a bug with plebbit-js
  pubsubHttpClientsOptions: ['http://localhost:5001/api/v0'],
};

// generate plebbit rpc auth key if doesn't exist
const plebbitRpcAuthKeyPath = path.join(defaultPlebbitOptions.dataPath, 'auth-key');
let plebbitRpcAuthKey;
try {
  plebbitRpcAuthKey = fs.readFileSync(plebbitRpcAuthKeyPath, 'utf8');
} catch (e) {
  plebbitRpcAuthKey = randomBytes(32).toString('base64').replace(/[/+=]/g, '').substring(0, 40);
  fs.ensureFileSync(plebbitRpcAuthKeyPath);
  fs.writeFileSync(plebbitRpcAuthKeyPath, plebbitRpcAuthKey);
}

let pendingStart = false;
const start = async () => {
  if (pendingStart) {
    return;
  }
  pendingStart = true;
  try {
    const started = await tcpPortUsed.check(port, '127.0.0.1');
    if (started) {
      return;
    }
    const plebbitWebSocketServer = await PlebbitWsServer({ port, plebbitOptions: defaultPlebbitOptions, authKey: plebbitRpcAuthKey });

    console.log(`plebbit rpc: listening on ws://localhost:${port} (local connections only)`);
    console.log(`plebbit rpc: listening on ws://localhost:${port}/${plebbitRpcAuthKey} (secret auth key for remote connections)`);
    plebbitWebSocketServer.ws.on('connection', (socket, request) => {
      console.log('plebbit rpc: new connection');
      // debug raw JSON RPC messages in console
      if (isDev) {
        socket.on('message', (message) => console.log(`plebbit rpc: ${message.toString()}`));
      }
    });
  } catch (e) {
    console.log('failed starting plebbit rpc server', e);
  }
  pendingStart = false;
};

// retry starting the plebbit rpc server every 1 second,
// in case it was started by another client that shut down and shut down the server with it
start();
setInterval(() => {
  start();
}, 1000);