import { cloneDeep, isNil } from 'lodash'

import { DEFAULT_INSTALLMENTS_AMOUNT, Intervals, PaymentProviders, Plan } from '../../../models'
import { PaymentMethods } from '../enums/payment-methods.enum'
import { Person } from '../models/person.model'

const DEFAULT_FULL_INSTALLMENTS_AMOUNT = 12

export class SmartfitPlanHelper {
  static makePlanWithSmartfitPaymentProvider(person: Person, plan: Plan): Plan {
    const newPlan = cloneDeep(plan)
    const addonsInstallments = person.getInstallmentsMap()

    newPlan.addInstallmentsToPaymentProviders({
      ...Object.keys(addonsInstallments)
        .concat([newPlan.getPaymentProvider(PaymentProviders.SMARTFIT).code])
        .reduce(
          (addons, addonCode) => ({
            ...addons,
            [addonCode]: SmartfitPlanHelper.calculateInstallments(person, newPlan, addonsInstallments[addonCode]),
          }),
          addonsInstallments,
        ),
    })

    return newPlan
  }

  private static calculateInstallments(person: Person, plan: Plan, installmentsBySmartfit: number): number {
    const isAnnually = plan.interval === Intervals.YEARLY
    const isCreditCard = person.paymentMethod === PaymentMethods.credit

    if (isNil(installmentsBySmartfit))
      return isAnnually ? DEFAULT_FULL_INSTALLMENTS_AMOUNT : DEFAULT_INSTALLMENTS_AMOUNT

    return isCreditCard ? installmentsBySmartfit : DEFAULT_INSTALLMENTS_AMOUNT
  }
}