'use strict';

const { User } = require('../model');
const { SubStatus } = require('../model/subscription');

const Customer = require('../model/customer'),
  cache = require('../helpers/mem_cache'),
  ObjectId = require('mongodb').ObjectId,
  utils = require('../helpers/utils'),
  { UserTypes, TrialTypes } = require('../helpers/constants'),
  { AppParamError } = require('../helpers/app_error'),
  { validateTrial } = require('../helpers/subscription_util'),
  moment = require('moment'),
  debug = require('debug')('agm:controllers-customer');

async function getCustomers_get(req, res) {

  const customers = await Customer.aggregate(
    [
      { $match: { kind: UserTypes.APP, markedDelete: { $ne: true } } },
      {
        $lookup: {
          from: 'jobs', // Reference the Job collection
          localField: '_id',
          foreignField: 'byPuid',
          as: 'cust_jobs'
        }
      },
      { $unwind: { path: '$cust_jobs', preserveNullAndEmptyArrays: true } },
      {
        $lookup: {
          from: 'partners', // Reference the Partner collection
          localField: 'partner',
          foreignField: '_id',
          as: 'partner_info',
        },
      },
      {
        $group: {
          '_id': {
            _id: '$_id',
            name: '$name',
            contact: '$contact',
            email: '$email',
            active: '$active',
            billable: '$billable',
            premium: '$premium',
            createdAt: '$createdAt',
            username: '$username',
            partner: {
              $arrayElemAt: [
                {
                  $map: {
                    input: '$partner_info',
                    as: 'partner',
                    in: {
                      _id: '$$partner._id',
                      name: '$$partner.name',
                      active: '$$partner.active',
                    },
                  },
                },
                0,
              ],
            }, // Include only _id, name, and active fields for partner
            selfSignup: '$selfSignup'
          },
          totalJobs: {
            $sum: { $cond: [{ $gte: ['$cust_jobs', null] }, 1, 0] }
          }
        }
      },
      {
        $replaceRoot: { newRoot: { $mergeObjects: ['$$ROOT', '$_id'] } }
      },
    ]).allowDiskUse(true);

  res.json(customers);
}

async function createCustomer_post(req, res) {
  const _customer = req.body;

  if (!_customer || !_customer.username || !_customer.password) AppParamError.throw();

  if (_customer.membership && _customer.membership.trials) {
    validateTrial(_customer.membership.trials);
  }

  delete _customer._id;
  const newCustomer = new Customer(Customer.toUser(_customer));
  const theUser = await newCustomer.createOne();
  res.json(theUser);
}

async function getCustomer_get(req, res) {
  const cId = req.params.customer_id;
  if (!ObjectId.isValid(cId)) AppParamError.throw();

  const view = req.query.view;
  let query = Customer.findOne({ _id: ObjectId(cId) }, null, { lean: true })
    .populate({ path: 'Country', select: 'code name -_id' })
    .populate({ path: 'partner', select: 'name description' });

  if (view !== 'edit') {
    query = query.select('-password');
  }

  const customer = await query;
  res.json(customer);
}

async function updateCustomer_put(req, res) {
  const _customer = req.body;
  // Note: Never try to update any subscriptions, customer must follow the sub. change process or changed made in Stripe dashboard only.
  delete _customer?.membership?.subscriptions;

  if (!_customer || !utils.isObjectId(_customer._id)) AppParamError.throw();

  if (utils.isBlank(_customer.username) && !utils.isBlank(_customer.password))
    _customer.password = undefined;

  if (!_customer.hasOwnProperty('active'))
    _customer.active = true;

  let customer = await Customer.findOne({ _id: ObjectId(_customer._id) }).lean();
  if (customer) {
    if (!utils.isEmptyObj(_customer.membership)) {
      // Check whether the customer having any trial subscriptions yet
      const hasTrialSub = customer.membership && customer.membership.subscriptions
        && customer.membership.subscriptions.some(sub => sub.status === SubStatus.TRIALING && !sub.canceled);

      // If having trial subscriptions, do not allow changing trials info for now
      if (hasTrialSub) {
        delete _customer.membership.trials;
      } else {
        if (!utils.isEmptyObj(_customer.membership.trials)) {
          const custTrials = customer.membership && customer.membership.trials;
          const curMoment = moment.utc();
          if (custTrials && custTrials.lasStartDate && custTrials.lastEndDate) {
            if (curMoment.isBetween(moment.utc(custTrials.lastStartDate), moment.utc(custTrials.lastEndDate))) {
              // Ignore updating trials if the customer is being in the middle of trial period
              delete _customer.membership.trials;
            }
          }
          // For days trial, if startDate not mentioned (and it is not in the trial period), infer and set the trial startDate from today UTC
          if (_customer.membership.trials.type === TrialTypes.DAYS && !_customer.membership.trials.startDate) {
            _customer.membership.trials.startDate = curMoment.toDate();
          }

          validateTrial(_customer.membership.trials);
        } else {
          delete _customer.membership.trials;

        }
      }
    }

    // Build update object with dot notation for membership fields to avoid overwriting subscriptions
    const updateDoc = { ..._customer };
    if (updateDoc.membership) {
      const membership = updateDoc.membership;
      delete updateDoc.membership;
      // Use dot notation for each membership field to preserve subscriptions
      for (const key in membership) {
        if (membership.hasOwnProperty(key)) {
          updateDoc[`membership.${key}`] = membership[key];
        }
      }
    }

    customer = await Customer.findOneAndUpdate({ _id: ObjectId(_customer._id) }, { $set: updateDoc }, { runValidators: true, new: true, lean: true });

    // Update related cached user info if the applicator premium changed
    // TODO: Later, may be improving this logic using hash or independant cached when needed.
    const uiList = cache.filterByKind(customer._id.toHexString());
    let uiValue;
    for (let i = 0; i < uiList.length; i++) {
      uiValue = uiList[i];
      if (uiValue) {
        if (customer.premium !== uiValue[1]['premium'])
          uiValue[1].premium = customer.premium;
      }
    }
  }
  res.json(customer);
}

async function deleteCustomer(req, res) {
  const _id = req.params.customer_id;

  if (!utils.isObjectId(_id)) AppParamError.throw();

  const customer = await Customer.findById(ObjectId(_id));
  if (customer)
    await customer.removeFull();
  // Remove all related logged user sessions
  const uiList = cache.filterByKind(_id);
  if (uiList) {
    for (const u of uiList)
      cache.delete(u[0]);
  }
  cache.delete(_id);

  res.json({ message: 'deleted' });
}

module.exports = {
  getCustomers_get, createCustomer_post, getCustomer_get, updateCustomer_put, deleteCustomer
}