var os = require("os");

require('../config/config');

require('../models/subscribers');

var Url = require('url-parse');

const { ObjectID } = require('mongodb');

const mongoose = require('mongoose');
const Subscription = mongoose.model('subscribers');

const server_constants = require('../tools/server_constants');

// SETTINGS WebPush Configuration
const webpush = require('web-push');

const subject = process.env.URLBASE_APP1; //'mailto:' + process.env.EMAIL_FROM
const publicVapidKey = process.env.PUBLIC_VAPI_KEY;
const privateVapidKey = process.env.PRIVATE_VAPI_KEY;

if (process.env.GCM_API_KEY !== "")
  webpush.setGCMAPIKey(process.env.GCM_API_KEY);

webpush.setVapidDetails(subject, publicVapidKey, privateVapidKey);
// console.log('setVapidDetails... config...');


module.exports = {
  TYPE_PROJECT: 1,
  TYPE_TODO: 2,

  MAX_PHASES: 5,
  FIRST_PROJ: '__PROJECTS',
  EXECUTE_CALCPROJ: true,

  getHostname: function () {
    return os.hostname()
  },
  testing: function () {
    return (process.env.TESTING_ON === '1')
  },

  mylog: function (...args) {
    if (!this.testing())
      console.log(args)
  },

  mylogoff: function (...args) {
    // doing nothing
  },

  mylogshow: function (...args) {
    console.log(args)
  },

  mylogserr: function (...args) {
    console.error(args)
  },

  allfieldSendMsg: function () {
    return ['userId', 'source', 'dest', 'message', 'datemsg', 'read', 'deleted', 'origin', 'idapp', 'status', 'options']
  },

  allfieldTodo: function () {
    return ['userId', 'pos', 'category', 'descr', 'priority', 'statustodo', 'created_at', 'modify_at',
      'completed_at', 'expiring_at', 'enableExpiring', 'id_prev', 'progress', 'modified', 'phase', 'assigned_to_userId', 'hoursplanned', 'hoursworked', 'start_date', 'themecolor', 'themebgcolor']
  },

  allfieldMyEvent: function () {
    return ['userId',]
  },

  allfieldTodoWithId: function () {
    return ['_id', ...this.allfieldTodo()]
  },

  // #TODO Projects++ Add fields ...
  allfieldProject: function () {
    return ['userId', 'pos', 'typeproj', 'id_main_project', 'id_parent', 'descr', 'longdescr', 'hoursplanned', 'hoursleft', 'themecolor', 'themebgcolor', 'hoursworked', 'priority', 'statusproj', 'created_at', 'modify_at',
      'completed_at', 'expiring_at', 'enableExpiring', 'id_prev', 'progressCalc', 'modified', 'live_url', 'test_url', 'begin_development', 'begin_test', 'totalphases', 'actualphase', 'hoursweeky_plannedtowork', 'endwork_estimate'
      , 'privacyread', 'privacywrite']
  },

  allfieldBooking: function () {
    return ['idapp', 'userId', 'id_bookedevent', 'numpeople', 'msgbooking', 'modified', 'infoevent', 'datebooked', 'booked']
  },

  allfieldBookingChange: function () {
    return ['numpeople', 'msgbooking', 'modified', 'infoevent', 'datebooked', 'booked']
  },

  allfieldProjectWithId: function () {
    return ['_id', ...this.allfieldProject()]
  },

  jsonCopy(src) {
    return JSON.parse(JSON.stringify(src))
  },

  CloneRecordToNew(src) {
    const myrec = Object.assign({}, src);
    delete myrec._doc['_id'];
    myrec._id = new ObjectID();

    return myrec._doc
  },

  sendBackNotif: function (subscription, payload) {

    console.log('sendBackNotif:', subscription, payload);
    // Pass object into sendNotification
    webpush.sendNotification(subscription, JSON.stringify(payload)).catch(err => console.error(err))
      .catch(err => {
        if (err.statusCode === 410) {
          // Gone: is not valid anymore (Expired probably!), so I have to delete from my db
          return Subscription.findOneAndRemove({ _id: subscription._id })
        } else {
          console.log('Subscription is no longer valid: ', err);
        }
      })
  },

  sendNotificationToUser: function (userId, title, content, openUrl, tag) {

    let payload = {
      title: title,
      message: content,
      url: openUrl,
      tag,
      // ttl: req.body.ttl,
      // icon: req.body.icon,
      // image: req.body.image,
      // badge: req.body.badge,
      // tag: req.body.tag
    };

    return Subscription.find({ userId }, (err, subscriptions) => {
      if (err) {
        console.error(`Error occurred while getting subscriptions`);
        res.status(500).json({
          error: 'Technical error occurred'
        });
        return false;
      } else {
        let conta = 0
        let parallelSubscriptionCalls = subscriptions.map((subscription) => {
          const trovati = subscriptions.length
          return new Promise((resolve, reject) => {
            const pushSubscription = {
              endpoint: subscription.endpoint,
              keys: {
                p256dh: subscription.keys.p256dh,
                auth: subscription.keys.auth
              }
            };

            conta++;


            const parse = require('url-parse');
            const parsedUrl = parse(subscription.endpoint);
            const audience = parsedUrl.protocol + '//' + parsedUrl.hostname;

            const vapidHeaders = webpush.getVapidHeaders(
              audience,
              process.env.URLBASE_APP1,
              process.env.PUBLIC_VAPI_KEY,
              process.env.PRIVATE_VAPI_KEY,
              'aes128gcm'
            );

            const pushOptions = {
              vapidDetails: {
                subject: process.env.URLBASE_APP1,
                privateKey: process.env.PRIVATE_VAPI_KEY,
                publicKey: process.env.PUBLIC_VAPI_KEY,
              },
              TTL: payload.ttl,
              headers: vapidHeaders
            };

            console.log('************  INVIO WEBPUSH.SENDNOTIFICATION N° ', conta, '/', trovati, 'A', subscription.browser);
            // console.log('vapidDetails', pushOptions.vapidDetails);

            payload.title = process.env.URLBASE_APP1 + ' Msg n° ' + conta + '/' + trovati;
            // payload.message += subscription.browser ;

            const pushPayload = JSON.stringify(payload);

            // console.log('A1) SUBS: pushSubscription', pushSubscription);
            // console.log('A2) OPZIONI: pushOptions', pushOptions);
            // console.log('A3) MSG_TO_SEND: pushPayload', pushPayload);

            webpush.sendNotification(
              pushSubscription,
              pushPayload,
              // pushOptions
            ).then((value) => {
              resolve({
                status: true,
                endpoint: subscription.endpoint,
                data: value
              });
            }).catch((err) => {
              reject({
                status: false,
                endpoint: subscription.endpoint,
                data: err
              });
            });
          }).catch(error => {
            console.log('ERROR: sendNotificationToUser', error.data.body)
          });
        });
        // q.allSettled(parallelSubscriptionCalls).then((pushResults) => {
        //   console.info(pushResults);
        // });
        // res.json({
        //   data: 'Push triggered'
        // });
        return true;
      }
    });

  },
  // **********************
  // SORT WITH PREV_ID
  // **********************
  mapSort: function (linkedList) {
    let sortedList = [];
    let remainingList = [];
    var map = new Map();
    var currentId = null;

    // console.log('linkedList', linkedList);

    // index the linked list by previous_item_id
    for (var i = 0; i < linkedList.length; i++) {
      var item = linkedList[i];
      if (item.id_prev === server_constants.LIST_START) {
        // first item
        currentId = String(item._id);
        // console.log('currentId', currentId);
        sortedList.push(item);
      } else {
        map.set(String(item.id_prev), i);
      }
    }

    let conta = 0;
    while (conta < linkedList.length) {
      // get the item with a previous item ID referencing the current item
      var nextItem = linkedList[map.get(currentId)];
      if (nextItem === undefined) {

      } else {
        sortedList.push(nextItem);
        currentId = String(nextItem._id);
      }
      conta++;
    }

    if (linkedList.length > sortedList.length) {
      // If are not in the list, I'll put at the bottom of the list
      // console.log('ATTENZIONE !!! ', sortedList.length, linkedList.length);
      for (const itemlinked of linkedList) {
        const elemtrov = sortedList.find((item) => item._id === itemlinked._id);
        if (elemtrov === undefined) {
          sortedList.push(itemlinked);
        }
      }
    }

    // console.log('DOPO sortedList', sortedList);

    return sortedList;
  },

  checkUserOk(userpassed, userauth) {
    this.mylog('checkUserOk', userpassed, userauth);
    if (String(userpassed) !== String(userauth)) {
      // I'm trying to write something not mine!
      this.mylog('userId = ', userpassed.userId, 'req.user._id', userauth);
      return { exit: true, ret: res.status(404).send({ code: server_constants.RIS_CODE_TODO_CREATING_NOTMYUSER }) }
    } else {
      return { exit: false, ret: false }
    }

  },

  convertHTMLtoText(myhtml) {
    let msg = myhtml;
    msg = msg.replace('&quot;', '"');
    msg = msg.replace('&gt;', '>');
    msg = msg.replace('&lt;', '<');
    msg = msg.replace('&amp;', '&');
    msg = msg.replace('<br>', '\n');

    return msg
  },

  removeSpecialCharForEmail(myhtml) {
    let msg = myhtml;
    msg = msg.replace(/"/g, '\'');

    return msg
  },

  getNomeAppByIdApp: function (idapp) {

    const myapp =
      MYAPPS.find(item => item.idapp === idapp);
    if (myapp)
      return myapp.name;
    else
      return '';
  },

  getHostByIdApp: function (idapp) {

    const myapp =
      MYAPPS.find(item => item.idapp === idapp);
    if (myapp) {
      let siteport = (myapp.portapp !== "0") ? (':' + myapp.portapp) : "";

      return myapp.host + siteport;
    } else
      return '';
  },

  getAdminEmailByIdApp: function (idapp) {
    const myapp = MYAPPS.find((item) => item.idapp === idapp);
    if (myapp)
      return myapp.adminemail;
    else
      return '';
  },

  getreplyToEmailByIdApp: function (idapp) {
    const myapp = MYAPPS.find((item) => item.idapp === idapp);
    if (myapp)
      return myapp.replyTo;
    else
      return '';
  },

  isManagAndAdminDifferent(idapp) {
    const manag = this.getManagerEmailByIdApp(idapp);
    return (manag !== this.getAdminEmailByIdApp(idapp)) && (manag !== '');
  },

  getManagerEmailByIdApp: function (idapp) {
    const myapp = MYAPPS.find((item) => item.idapp === idapp);
    if (myapp)
      return myapp.manageremail;
    else
      return '';
  },

  getQueryTable(idapp, params) {
    // console.log('idapp', idapp);
    // console.table(params);

    if (typeof params.startRow !== 'number') {
      throw new Error('startRow must be number')
    } else if (typeof params.endRow !== 'number') {
      throw new Error('endRow must be number')
    }

    const query = [
      { $match: Object.assign({ idapp }, params.filter) }
    ];

    if (params.sortBy) {
      // maybe we want to sort by blog title or something
      const mysort = { $sort: params.sortBy };
      // console.log('sortBy', params.sortBy);
      // console.table(mysort);
      query.push(mysort)
    }

    query.push(
      {
        $group: {
          _id: null,
          // get a count of every result that matches until now
          count: { $sum: 1 },
          // keep our results for the next operation
          results: { $push: '$$ROOT' }
        }
      },
      // and finally trim the results to within the range given by start/endRow
      {
        $project: {
          count: 1,
          rows: { $slice: ['$results', params.startRow, params.endRow] }
        }
      }
    );
    return query

  },

  executeQueryTable(mythistable, idapp, params) {
    let query = this.getQueryTable(idapp, params);

    return mythistable
      .aggregate(query)
      .then(([{ count, rows }]) => {
        return ({ count, rows })
      })
      .catch(err => {
        return {
          count: 0, rows: []
        }
      });

  },

  isBitActive(bit, whattofind) {
    return ((bit & whattofind) === whattofind)
  },

  SetBit(myval, bit) {
    myval = myval & bit;
    return myval
  }

};