// core-node.js
// Copyright (C) 2022 DTP Technologies, LLC
// License: Apache-2.0

'use strict';

const uuidv4 = require('uuid').v4;

const mongoose = require('mongoose');
const fetch = require('node-fetch'); // jshint ignore:line

const CoreNode = mongoose.model('CoreNode');
const CoreNodeRequest = mongoose.model('CoreNodeRequest');

const { SiteService, SiteError } = require('../../lib/site-lib');

class CoreNodeService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);
  }

  async create (coreDefinition) {
    const core = new CoreNode();
    core.created = new Date();

    core.address = { };

    if (!coreDefinition.host) {
      throw new SiteError(406, 'Must provide Core Node host address');
    }
    core.address.host = coreDefinition.host.trim();

    if (!coreDefinition.port) {
      throw new SiteError(406, 'Must provide Core Node TCP port number');
    }

    coreDefinition.port = parseInt(coreDefinition.port, 10);
    if (coreDefinition.port < 1 || coreDefinition.port > 65535) {
      throw new SiteError(406, 'Core Node port number out of range');
    }

    await core.save();

    return core.toObject();
  }
  
  async broadcast (request) {
    const results = [ ];
    await CoreNode
      .find()
      .cursor()
      .eachAsync(async (core) => {
        try {
          const response = await this.sendRequest(core, request);
          results.push({ coreId: core._id, request, response });
        } catch (error) {
          this.log.error('failed to send Core Node request', { core: core._id, request: request.url, error });
        }
      });
    return results;
  }

  async sendRequest (core, request) {
    const requestUrl = `https://${core.address.host}:${core.address.port}${request.url}`;

    const req = new CoreNodeRequest();
    req.created = new Date();
    req.core = core._id;
    req.token = {
      value: uuidv4(),
      claimed: false,
    };
    req.url = request.url;
    await req.save();

    try {
      const response = await fetch(requestUrl, {
        method: request.method,
        body: request.body,
      });
      const json = await response.json();
      return { request: req.toObject(), response: json };
    } catch (error) {
      this.log.error('failed to send Core Node request', { core: core._id, request: request.url, error });
      throw error;
    }

    return req.toObject();
  }
}

module.exports = {
  slug: 'core-node',
  name: 'coreNode',
  create: (dtp) => { return new CoreNodeService(dtp); },
};