const path = require('path');
const { fork } = require('child_process');
const _ = require('lodash');
const nedb = require('nedb-promises');

const { datadir } = require('../utility/directories');
const socket = require('../utility/socket');
const { encryptConnection } = require('../utility/crypting');
const { handleProcessCommunication } = require('../utility/processComm');

function getPortalCollections() {
  if (process.env.CONNECTIONS) {
    return _.compact(process.env.CONNECTIONS.split(',')).map(id => ({
      _id: id,
      engine: process.env[`ENGINE_${id}`],
      server: process.env[`SERVER_${id}`],
      user: process.env[`USER_${id}`],
      password: process.env[`PASSWORD_${id}`],
      port: process.env[`PORT_${id}`],
      displayName: process.env[`LABEL_${id}`],
    }));
  }
  return null;
}
const portalConnections = getPortalCollections();

module.exports = {
  datastore: null,
  opened: [],

  async _init() {
    const dir = datadir();
    if (!portalConnections) {
      // @ts-ignore
      this.datastore = nedb.create(path.join(dir, 'connections.jsonl'));
    }
  },

  list_meta: 'get',
  async list() {
    return portalConnections || this.datastore.find();
  },

  test_meta: {
    method: 'post',
    raw: true,
  },
  test(req, res) {
    const subprocess = fork(process.argv[1], ['--start-process', 'connectProcess', ...process.argv.slice(3)]);
    subprocess.on('message', resp => {
      if (handleProcessCommunication(resp, subprocess)) return;
      // @ts-ignore
      const { msgtype } = resp;
      if (msgtype == 'connected' || msgtype == 'error') {
        res.json(resp);
      }
    });
    subprocess.send(req.body);
  },

  save_meta: 'post',
  async save(connection) {
    if (portalConnections) return;
    let res;
    const encrypted = encryptConnection(connection);
    if (connection._id) {
      res = await this.datastore.update(_.pick(connection, '_id'), encrypted);
    } else {
      res = await this.datastore.insert(encrypted);
    }
    socket.emitChanged('connection-list-changed');
    return res;
  },

  delete_meta: 'post',
  async delete(connection) {
    if (portalConnections) return;
    const res = await this.datastore.remove(_.pick(connection, '_id'));
    socket.emitChanged('connection-list-changed');
    return res;
  },

  get_meta: 'get',
  async get({ conid }) {
    if (portalConnections) return portalConnections.find(x => x._id == conid);
    const res = await this.datastore.find({ _id: conid });
    return res[0];
  },
};