'use strict';

const ObjectId = require('mongodb').ObjectId,
  Job = require('../model/job'),
  utils = require('./utils'),
  env = require('../helpers/env'),
  { SubType } = require('../model/subscription'),
  { Errors, TrialTypes } = require('./constants'),
  { AppError, AppMembershipError, AppParamError } = require('./app_error'),
  assert = require('assert'),
  moment = require('moment');

const stripe = require('stripe')(env.STRIPE_SEC_KEY, {
  apiVersion: env.STRIPE_API_VERSION,
  appInfo: { // For sample support and debugging, not required for production:
    name: 'AG-NAV AgMission Stripe Intergration',
    version: '2.10.13',
    url: 'https://agmission.agnav.com'
  }
})

function _createFilterObj(uid, fromTS, toTS) {
  const filterOps = { byPuid: uid, markedDelete: { $ne: true } }

  if (fromTS || toTS) filterOps.createdAt = {};
  if (fromTS) filterOps.createdAt.$gte = new Date(fromTS * 1e3);
  if (toTS) filterOps.createdAt.$lte = new Date(toTS * 1e3);

  return filterOps;
}

async function calcTotalAreaByUser(uid, fromTS, toTS) {

  if (!uid || !ObjectId.isValid(uid)) return 0;

  const filterOps = _createFilterObj(uid, fromTS, toTS);
  const pipeline = [
    {
      $match: filterOps
    },
    {
      $group: {
        "_id": "null",
        "ttSprayAreas": { $sum: "$ttSprArea" }
      }
    },
    {
      $project: {
        '_id': false,
        ttSprayAreas: { $round: ["$ttSprayAreas", 2] }
      }
    }];
  const res = await Job.aggregate(pipeline);
  return res && res.length ? res[0].ttSprayAreas : 0;
}

async function getJobUsageByTime(byPuid, fromTS, toTS) {
  if (!ObjectId.isValid(byPuid)) return null;

  const filterOps = _createFilterObj(byPuid, fromTS, toTS);
  const pipeline = [
    { $match: filterOps },
    {
      $lookup: {
        from: 'applications',
        localField: '_id',
        foreignField: 'jobId',
        as: 'jobs_apps'
      }
    },
    { $unwind: { path: '$jobs_apps', preserveNullAndEmptyArrays: true } },
    {
      $group: {
        '_id': {
          '_id': '$_id',
          'createdAt': '$createdAt',
        },
        ttSprArea: { $first: "$ttSprArea" },
        totalSprayed: { $sum: '$jobs_apps.totalSprayed' },
        updateDate: { $max: '$jobs_apps.updateDate' }
      }
    },
    // { $match: { totalSprayed: { $gt: 0 } } },
    {
      $replaceRoot: { newRoot: { $mergeObjects: ['$$ROOT', '$_id'] } }
    },
    {
      $project: {
        _id: false,
        jobId: '$_id',
        ttSprArea: 1,
        totalSprayed: { $round: ['$totalSprayed', 2] },
        updateDate: 1,
        createdAt: 1
      }
    }
  ];

  const res = await Job.aggregate(pipeline);
  return res;
}

function getPkgSubfromUserInfo(userInfo) {
  if (!userInfo || !userInfo.membership || utils.isEmptyArray(userInfo.membership.subscriptions)) AppMembershipError.throw();

  let pkgSub = userInfo.membership.subscriptions.filter(sub => sub.type === SubType.PACKAGE);
  if (!utils.isEmptyArray(pkgSub)) {
    pkgSub = pkgSub[0];
  }
  else {
    AppMembershipError.throw(Errors.PKG_SUBSCRIPTION_NOT_FOUND);
  }
  return pkgSub;
}

function getSubMetaField(pkgSub, metaField) {
  return pkgSub && !utils.isEmptyArray(pkgSub.items) && (pkgSub.items[0].metadata && pkgSub.items[0].metadata[metaField]);
}

function validateTrial(trials, errorCode = Errors.INVALID_PARAM) {
  if (!trials) return;

  if (TrialTypes.BY_DATE === trials.type && trials.byDate) {
    const byDateMoment = moment.utc(trials.byDate);
    assert(byDateMoment.isValid(), AppError.create(Errors.INVALID_PARAM));
    assert(moment.utc(byDateMoment).diff(moment.utc(), "days") > 1, AppError.create(errorCode));
  } else if (TrialTypes.DAYS === trials.type && trials.trialDays > 0) {
    const endTrialDate = (trials.startDate ? moment.utc(trials.startDate) : moment.utc()).add(trials.trialDays, "days");
    assert(endTrialDate.diff(moment.utc(), "days") > 1, AppError.create(errorCode));
  }
}

function timeToQueryRange(byTime, fieldName) {
  let qRange;
  if (!byTime || !fieldName) return qRange;

  const m = byTime.match(/^(\d{1,3})(?<time>[m|d]{1})|\d{4}$/is);
  if (m && m.length > 2) {
    let startUTC;
    if (m.groups && m.groups['time']) {
      startUTC = moment().utc();
      qRange = `${fieldName}<=${startUTC.unix()}`;
      const daysOrMonths = m[1] > 0 ? m[1] : 3;
      qRange = `${fieldName}>=${startUTC.subtract(daysOrMonths, m.groups['time'].toLowerCase() == 'd' ? 'days' : 'months').unix()} AND ` + qRange;
    } else {
      startUTC = moment(m[0]).utc();
      qRange = `${fieldName}>=${startUTC.startOf('year').unix()} AND ${fieldName}<=${startUTC.endOf('year').unix()}`;
    }
  }
  return qRange;
}

module.exports = {
  stripe, getPkgSubfromUserInfo, getSubMetaField, calcTotalAreaByUser, getJobUsageByTime, validateTrial, timeToQueryRange
}