const Settings = require('@overleaf/settings')
const RecurlyWrapper = require('./RecurlyWrapper')
const PlansLocator = require('./PlansLocator')
const SubscriptionFormatters = require('./SubscriptionFormatters')
const SubscriptionLocator = require('./SubscriptionLocator')
const V1SubscriptionManager = require('./V1SubscriptionManager')
const InstitutionsGetter = require('../Institutions/InstitutionsGetter')
const PublishersGetter = require('../Publishers/PublishersGetter')
const sanitizeHtml = require('sanitize-html')
const _ = require('underscore')
const async = require('async')
const SubscriptionHelper = require('./SubscriptionHelper')
const { promisify } = require('../../util/promises')

function buildHostedLink(recurlySubscription, type) {
  const recurlySubdomain = Settings.apis.recurly.subdomain
  const hostedLoginToken = recurlySubscription.account.hosted_login_token
  let path = ''
  if (type === 'billingDetails') {
    path = 'billing_info/edit?ht='
  }
  if (hostedLoginToken && recurlySubdomain) {
    return [
      'https://',
      recurlySubdomain,
      '.recurly.com/account/',
      path,
      hostedLoginToken,
    ].join('')
  }
}

function buildUsersSubscriptionViewModel(user, callback) {
  async.auto(
    {
      personalSubscription(cb) {
        SubscriptionLocator.getUsersSubscription(user, cb)
      },
      recurlySubscription: [
        'personalSubscription',
        (cb, { personalSubscription }) => {
          if (
            personalSubscription == null ||
            personalSubscription.recurlySubscription_id == null ||
            personalSubscription.recurlySubscription_id === ''
          ) {
            return cb(null, null)
          }
          RecurlyWrapper.getSubscription(
            personalSubscription.recurlySubscription_id,
            { includeAccount: true },
            cb
          )
        },
      ],
      recurlyCoupons: [
        'recurlySubscription',
        (cb, { recurlySubscription }) => {
          if (!recurlySubscription) {
            return cb(null, null)
          }
          const accountId = recurlySubscription.account.account_code
          RecurlyWrapper.getAccountActiveCoupons(accountId, cb)
        },
      ],
      plan: [
        'personalSubscription',
        (cb, { personalSubscription }) => {
          if (personalSubscription == null) {
            return cb()
          }
          const plan = PlansLocator.findLocalPlanInSettings(
            personalSubscription.planCode
          )
          if (plan == null) {
            return cb(
              new Error(
                `No plan found for planCode '${personalSubscription.planCode}'`
              )
            )
          }
          cb(null, plan)
        },
      ],
      memberGroupSubscriptions(cb) {
        SubscriptionLocator.getMemberSubscriptions(user, cb)
      },
      managedGroupSubscriptions(cb) {
        SubscriptionLocator.getManagedGroupSubscriptions(user, cb)
      },
      currentInstitutionsWithLicence(cb) {
        InstitutionsGetter.getCurrentInstitutionsWithLicence(user._id, cb)
      },
      managedInstitutions(cb) {
        InstitutionsGetter.getManagedInstitutions(user._id, cb)
      },
      managedPublishers(cb) {
        PublishersGetter.getManagedPublishers(user._id, cb)
      },
      v1SubscriptionStatus(cb) {
        V1SubscriptionManager.getSubscriptionStatusFromV1(
          user._id,
          (error, status, v1Id) => {
            if (error) {
              return cb(error)
            }
            cb(null, status)
          }
        )
      },
    },
    (err, results) => {
      if (err) {
        return callback(err)
      }
      let {
        personalSubscription,
        memberGroupSubscriptions,
        managedGroupSubscriptions,
        currentInstitutionsWithLicence,
        managedInstitutions,
        managedPublishers,
        v1SubscriptionStatus,
        recurlySubscription,
        recurlyCoupons,
        plan,
      } = results

      if (memberGroupSubscriptions == null) {
        memberGroupSubscriptions = []
      }
      if (managedGroupSubscriptions == null) {
        managedGroupSubscriptions = []
      }
      if (managedInstitutions == null) {
        managedInstitutions = []
      }
      if (v1SubscriptionStatus == null) {
        v1SubscriptionStatus = {}
      }
      if (recurlyCoupons == null) {
        recurlyCoupons = []
      }

      if (
        personalSubscription &&
        typeof personalSubscription.toObject === 'function'
      ) {
        // Downgrade from Mongoose object, so we can add a recurly and plan attribute
        personalSubscription = personalSubscription.toObject()
      }

      if (plan != null) {
        personalSubscription.plan = plan
      }

      if (personalSubscription && recurlySubscription) {
        const tax = recurlySubscription.tax_in_cents || 0
        // Some plans allow adding more seats than the base plan provides.
        // This is recorded as a subscription add on.
        // Note: tax_in_cents already includes the tax for any addon.
        let addOnPrice = 0
        let additionalLicenses = 0
        if (
          plan.membersLimitAddOn &&
          Array.isArray(recurlySubscription.subscription_add_ons)
        ) {
          recurlySubscription.subscription_add_ons.forEach(addOn => {
            if (addOn.add_on_code === plan.membersLimitAddOn) {
              addOnPrice += addOn.quantity * addOn.unit_amount_in_cents
              additionalLicenses += addOn.quantity
            }
          })
        }
        const totalLicenses = (plan.membersLimit || 0) + additionalLicenses
        personalSubscription.recurly = {
          tax,
          taxRate: recurlySubscription.tax_rate
            ? parseFloat(recurlySubscription.tax_rate._)
            : 0,
          billingDetailsLink: buildHostedLink(
            recurlySubscription,
            'billingDetails'
          ),
          accountManagementLink: buildHostedLink(recurlySubscription),
          additionalLicenses,
          totalLicenses,
          nextPaymentDueAt: SubscriptionFormatters.formatDate(
            recurlySubscription.current_period_ends_at
          ),
          currency: recurlySubscription.currency,
          state: recurlySubscription.state,
          trialEndsAtFormatted: SubscriptionFormatters.formatDate(
            recurlySubscription.trial_ends_at
          ),
          trial_ends_at: recurlySubscription.trial_ends_at,
          activeCoupons: recurlyCoupons,
          account: recurlySubscription.account,
        }
        if (recurlySubscription.pending_subscription) {
          const pendingPlan = PlansLocator.findLocalPlanInSettings(
            recurlySubscription.pending_subscription.plan.plan_code
          )
          if (pendingPlan == null) {
            return callback(
              new Error(
                `No plan found for planCode '${personalSubscription.planCode}'`
              )
            )
          }
          let pendingAdditionalLicenses = 0
          let pendingAddOnTax = 0
          let pendingAddOnPrice = 0
          if (recurlySubscription.pending_subscription.subscription_add_ons) {
            if (
              pendingPlan.membersLimitAddOn &&
              Array.isArray(
                recurlySubscription.pending_subscription.subscription_add_ons
              )
            ) {
              recurlySubscription.pending_subscription.subscription_add_ons.forEach(
                addOn => {
                  if (addOn.add_on_code === pendingPlan.membersLimitAddOn) {
                    pendingAddOnPrice +=
                      addOn.quantity * addOn.unit_amount_in_cents
                    pendingAdditionalLicenses += addOn.quantity
                  }
                }
              )
            }
            // Need to calculate tax ourselves as we don't get tax amounts for pending subs
            pendingAddOnTax =
              personalSubscription.recurly.taxRate * pendingAddOnPrice
          }
          const pendingSubscriptionTax =
            personalSubscription.recurly.taxRate *
            recurlySubscription.pending_subscription.unit_amount_in_cents
          personalSubscription.recurly.price = SubscriptionFormatters.formatPrice(
            recurlySubscription.pending_subscription.unit_amount_in_cents +
              pendingAddOnPrice +
              pendingAddOnTax +
              pendingSubscriptionTax,
            recurlySubscription.currency
          )
          const pendingTotalLicenses =
            (pendingPlan.membersLimit || 0) + pendingAdditionalLicenses
          personalSubscription.recurly.pendingAdditionalLicenses = pendingAdditionalLicenses
          personalSubscription.recurly.pendingTotalLicenses = pendingTotalLicenses
          personalSubscription.pendingPlan = pendingPlan
        } else {
          personalSubscription.recurly.price = SubscriptionFormatters.formatPrice(
            recurlySubscription.unit_amount_in_cents + addOnPrice + tax,
            recurlySubscription.currency
          )
        }
      }

      for (const memberGroupSubscription of memberGroupSubscriptions) {
        if (memberGroupSubscription.teamNotice) {
          memberGroupSubscription.teamNotice = sanitizeHtml(
            memberGroupSubscription.teamNotice
          )
        }
      }

      callback(null, {
        personalSubscription,
        managedGroupSubscriptions,
        memberGroupSubscriptions,
        currentInstitutionsWithLicence,
        managedInstitutions,
        managedPublishers,
        v1SubscriptionStatus,
      })
    }
  )
}

function buildPlansList(currentPlan) {
  const { plans } = Settings

  const allPlans = {}
  plans.forEach(plan => {
    allPlans[plan.planCode] = plan
  })

  const result = { allPlans }

  if (currentPlan) {
    result.planCodesChangingAtTermEnd = _.pluck(
      _.filter(plans, plan => {
        if (!plan.hideFromUsers) {
          return SubscriptionHelper.shouldPlanChangeAtTermEnd(currentPlan, plan)
        }
      }),
      'planCode'
    )
  }

  result.studentAccounts = _.filter(
    plans,
    plan => plan.planCode.indexOf('student') !== -1
  )

  result.groupMonthlyPlans = _.filter(
    plans,
    plan => plan.groupPlan && !plan.annual
  )

  result.groupAnnualPlans = _.filter(
    plans,
    plan => plan.groupPlan && plan.annual
  )

  result.individualMonthlyPlans = _.filter(
    plans,
    plan =>
      !plan.groupPlan &&
      !plan.annual &&
      plan.planCode !== 'personal' && // Prevent the personal plan from appearing on the change-plans page
      plan.planCode.indexOf('student') === -1
  )

  result.individualAnnualPlans = _.filter(
    plans,
    plan =>
      !plan.groupPlan && plan.annual && plan.planCode.indexOf('student') === -1
  )

  return result
}

module.exports = {
  buildUsersSubscriptionViewModel,
  buildPlansList,
  promises: {
    buildUsersSubscriptionViewModel: promisify(buildUsersSubscriptionViewModel),
  },
}