lila/modules/plan/src/main/PlanApi.scala

package lila.plan

import lila.db.dsl._
import lila.memo._
import lila.user.{ User, UserRepo }

import org.joda.time.DateTime
import reactivemongo.api.collections.bson.BSONBatchCommands.AggregationFramework._
import scala.concurrent.duration._

final class PlanApi(
    stripeClient: StripeClient,
    patronColl: Coll,
    chargeColl: Coll,
    notifier: PlanNotifier,
    uncacheLightUser: String => Funit,
    bus: lila.common.Bus,
    payPalIpnKey: PayPalIpnKey) {

  import BsonHandlers._
  import PatronHandlers._
  import ChargeHandlers._

  def checkout(userOption: Option[User], data: Checkout): Funit =
    getOrMakePlan(data.cents) flatMap { plan =>
      userOption.fold(setAnonPlan(plan, data, renew = data.isMonthly)) { user =>
        setUserPlan(user, plan, data, renew = data.isMonthly)
      }
    } void

  def switch(user: User, cents: Cents): Fu[StripeSubscription] =
    userCustomer(user) flatMap {
      case None => fufail(s"Can't switch non-existent customer ${user.id}")
      case Some(customer) =>
        customer.firstSubscription match {
          case None                                 => fufail(s"Can't switch non-existent subscription of ${user.id}")
          case Some(sub) if sub.plan.cents == cents => fuccess(sub)
          case Some(sub) =>
            getOrMakePlan(cents) flatMap { plan =>
              stripeClient.updateSubscription(sub, plan, none)
            }
        }
    }

  def cancel(user: User): Funit =
    userCustomer(user) flatMap {
      case None => fufail(s"Can't cancel non-existent customer ${user.id}")
      case Some(customer) =>
        customer.firstSubscription match {
          case None => fufail(s"Can't cancel non-existent subscription of ${user.id}")
          case Some(sub) => stripeClient.cancelSubscription(sub) >>
            setDbUserPlan(user, user.plan.disable) >>
            patronColl.update($id(user.id), $unset("stripe", "payPal", "expiresAt")).void >>-
            logger.info(s"Canceled subscription $sub of ${user.username}")
        }
    }

  def onStripeCharge(charge: StripeCharge): Funit =
    customerIdPatron(charge.customer) flatMap { patronOption =>
      chargeColl.insert(Charge.make(
        userId = patronOption.map(_.userId),
        stripe = Charge.Stripe(charge.id, charge.customer).some,
        cents = charge.amount)) >> {
        patronOption match {
          case None =>
            logger.info(s"Charged anon customer $charge")
            lila.mon.plan.amount(charge.amount.value)
            bus.publish(lila.hub.actorApi.plan.ChargeEvent(
              username = "Anonymous",
              amount = charge.amount.value), 'plan)
            funit
          case Some(patron) =>
            logger.info(s"Charged $charge $patron")
            lila.mon.plan.amount(charge.amount.value)
            UserRepo byId patron.userId flatten s"Missing user for $patron" flatMap { user =>
              bus.publish(lila.hub.actorApi.plan.ChargeEvent(
                username = user.username,
                amount = charge.amount.value), 'plan)
              val p2 = patron.copy(
                stripe = Patron.Stripe(charge.customer).some
              ).levelUpIfPossible
              patronColl.update($id(patron.id), p2) >>
                setDbUserPlan(user,
                  if (patron.canLevelUp) user.plan.incMonths
                  else user.plan.enable)
            }
        }
      }
    }

  def onPaypalCharge(
    userId: Option[String],
    email: Option[Patron.PayPal.Email],
    subId: Option[Patron.PayPal.SubId],
    cents: Cents,
    name: Option[String],
    txnId: Option[String],
    ip: String,
    key: PayPalIpnKey): Funit =
    if (key != payPalIpnKey) {
      logger.error(s"Invalid PayPal IPN key $key from $ip $userId $cents")
      funit
    }
    else (cents.value >= 100) ?? {
      chargeColl.insert(Charge.make(
        userId = userId,
        payPal = Charge.PayPal(
          name = name,
          email = email.map(_.value),
          txnId = txnId,
          subId = subId.map(_.value),
          ip = ip.some).some,
        cents = cents)) >>
        (userId ?? UserRepo.named) flatMap { userOption =>
          bus.publish(lila.hub.actorApi.plan.ChargeEvent(
            username = userOption.fold("Anonymous")(_.username),
            amount = cents.value), 'plan)
          userOption ?? { user =>
            val payPal = Patron.PayPal(email, subId, DateTime.now)
            userPatron(user).flatMap {
              case None => patronColl.insert(Patron(
                _id = Patron.UserId(user.id),
                payPal = payPal.some,
                lastLevelUp = DateTime.now
              ).expireInOneMonth) >>
                setDbUserPlan(user, lila.user.Plan.start) >>
                notifier.onStart(user)
              case Some(patron) =>
                val p2 = patron.copy(
                  payPal = payPal.some
                ).levelUpIfPossible.expireInOneMonth
                patronColl.update($id(patron.id), p2) >>
                  setDbUserPlan(user,
                    if (patron.canLevelUp) user.plan.incMonths
                    else user.plan.enable)
            } >>- {
              logger.info(s"Charged ${user.username} with paypal: $cents")
              lila.mon.plan.amount(cents.value)
            }
          }
        }
    }

  def onSubscriptionDeleted(sub: StripeSubscription): Funit =
    customerIdPatron(sub.customer) flatMap {
      case None =>
        logger.warn(s"Deleted subscription of unknown patron $sub")
        funit
      case Some(patron) =>
        UserRepo byId patron.userId flatten s"Missing user for $patron" flatMap { user =>
          setDbUserPlan(user, user.plan.disable) >>
            patronColl.update($id(user.id), patron.removeStripe).void >>-
            logger.info(s"Unsubed ${user.username} ${sub}")
        }
    }

  def getEvent = stripeClient.getEvent _

  def customerInfo(user: User, customer: StripeCustomer): Fu[Option[CustomerInfo]] =
    stripeClient.getNextInvoice(customer.id) zip
      stripeClient.getPastInvoices(customer.id) map {
        case (Some(nextInvoice), pastInvoices) =>
          customer.firstSubscription match {
            case Some(sub) => MonthlyCustomerInfo(sub, nextInvoice, pastInvoices).some
            case None =>
              logger.warn(s"Can't identify ${user.username} monthly subscription $customer")
              none
          }
        case (None, _) =>
          customer.firstSubscription match {
            case Some(sub) => OneTimeCustomerInfo(customer, sub).some
            case None =>
              logger.warn(s"Can't identify ${user.username} one-time subscription $customer")
              none
          }
      }

  import PlanApi.SyncResult.{ ReloadUser, Synced }

  def sync(user: User): Fu[PlanApi.SyncResult] = userPatron(user) flatMap {

    case None if user.plan.active =>
      logger.warn(s"sync: disable plan of non-patron")
      setDbUserPlan(user, user.plan.disable) inject ReloadUser

    case None => fuccess(Synced(none, none))

    case Some(patron) => (patron.stripe, patron.payPal) match {

      case (Some(stripe), _) => stripeClient.getCustomer(stripe.customerId) flatMap {
        case None =>
          logger.warn(s"sync: unset DB patron that's not in stripe")
          patronColl.update($id(patron.id), patron.removeStripe) >> sync(user)
        case Some(customer) if customer.firstSubscription.isEmpty =>
          logger.warn(s"sync: unset DB patron of customer without a subscription")
          patronColl.update($id(patron.id), patron.removeStripe) >> sync(user)
        case Some(customer) if customer.firstSubscription.isDefined && !user.plan.active =>
          logger.warn(s"sync: enable plan of customer with a subscription")
          setDbUserPlan(user, user.plan.enable) inject ReloadUser
        case customer => fuccess(Synced(patron.some, customer))
      }

      case (_, Some(paypal)) =>
        if (!user.plan.active) {
          logger.warn(s"sync: enable plan of customer with paypal")
          setDbUserPlan(user, user.plan.enable) inject ReloadUser
        }
        else fuccess(Synced(patron.some, none))

      case (None, None) if user.plan.active =>
        logger.warn(s"sync: disable plan of patron with no paypal or stripe")
        setDbUserPlan(user, user.plan.disable) inject ReloadUser

      case _ => fuccess(Synced(patron.some, none))
    }
  }

  private val recentChargeUserIdsCache = AsyncCache[Int, List[User.ID]](
    f = nb => chargeColl.primitive[User.ID]($empty, sort = $doc("date" -> -1), nb = nb, "userId"),
    timeToLive = 1 hour)

  def recentChargeUserIds(nb: Int): Fu[List[User.ID]] = recentChargeUserIdsCache(nb)

  def recentChargesOf(user: User): Fu[List[Charge]] =
    chargeColl.find($doc("userId" -> user.id)).sort($doc("date" -> -1)).list[Charge]()

  private val topPatronUserIdsCache = AsyncCache[Int, List[User.ID]](
    f = nb => chargeColl.aggregate(
      Match($doc("userId" $exists true)), List(
        GroupField("userId")("total" -> SumField("cents")),
        Sort(Descending("total")),
        Limit(nb))).map {
        _.documents.flatMap { _.getAs[User.ID]("_id") }
      },
    timeToLive = 1 hour)

  def topPatronUserIds(nb: Int): Fu[List[User.ID]] = topPatronUserIdsCache(nb)

  private def getOrMakePlan(cents: Cents): Fu[StripePlan] =
    stripeClient.getPlan(cents) getOrElse stripeClient.makePlan(cents)

  private def setAnonPlan(plan: StripePlan, data: Checkout, renew: Boolean): Fu[StripeSubscription] =
    stripeClient.createAnonCustomer(plan, data) map { customer =>
      logger.info(s"Subed anon $customer to ${plan} renew=$renew")
      customer.firstSubscription err s"Can't create anon $customer subscription to $plan"
    } flatMap { subscription =>
      if (renew) fuccess(subscription)
      else stripeClient dontRenewSubscription subscription
    }

  private def setUserPlan(user: User, plan: StripePlan, data: Checkout, renew: Boolean): Fu[StripeSubscription] =
    userCustomer(user) flatMap {
      case None => createCustomer(user, data, plan) map { customer =>
        customer.firstSubscription err s"Can't create ${user.username} subscription for customer $customer"
      }
      case Some(customer) => setCustomerPlan(customer, plan, data.source) flatMap { sub =>
        saveStripePatron(user, customer.id, data.isMonthly) inject sub
      }
    } flatMap { subscription =>
      logger.info(s"Subed user ${user.username} $subscription renew=$renew")
      if (renew) fuccess(subscription)
      else stripeClient dontRenewSubscription subscription
    }

  private def setDbUserPlan(user: User, plan: lila.user.Plan): Funit =
    UserRepo.setPlan(user, plan) >> uncacheLightUser(user.id)

  private def createCustomer(user: User, data: Checkout, plan: StripePlan): Fu[StripeCustomer] =
    stripeClient.createCustomer(user, data, plan) flatMap { customer =>
      saveStripePatron(user, customer.id, data.isMonthly) >>
        setDbUserPlan(user, lila.user.Plan.start) >>
        notifier.onStart(user) >>-
        logger.info(s"Create ${user.username} customer $customer") inject customer
    }

  private def saveStripePatron(user: User, customerId: CustomerId, renew: Boolean): Funit = userPatron(user) flatMap {
    case None => patronColl.insert(Patron(
      _id = Patron.UserId(user.id),
      stripe = Patron.Stripe(customerId).some,
      lastLevelUp = DateTime.now
    ).expireInOneMonth(!renew))
    case Some(patron) => patronColl.update(
      $id(patron.id),
      patron.copy(stripe = Patron.Stripe(customerId).some).expireInOneMonth(!renew))
  } void

  private def setCustomerPlan(customer: StripeCustomer, plan: StripePlan, source: Source): Fu[StripeSubscription] =
    customer.subscriptions.data.find(_.plan == plan) match {
      case Some(sub) => fuccess(sub)
      case None => customer.firstSubscription match {
        case None      => stripeClient.createSubscription(customer, plan, source)
        case Some(sub) => stripeClient.updateSubscription(sub, plan, source.some)
      }
    }

  private def userCustomerId(user: User): Fu[Option[CustomerId]] =
    userPatron(user) map {
      _.flatMap { _.stripe.map(_.customerId) }
    }

  private def userCustomer(user: User): Fu[Option[StripeCustomer]] =
    userCustomerId(user) flatMap {
      _ ?? stripeClient.getCustomer
    }

  private def customerIdPatron(id: CustomerId): Fu[Option[Patron]] =
    patronColl.uno[Patron](selectStripeCustomerId(id))

  private def selectStripeCustomerId(id: CustomerId): Bdoc =
    $doc("stripe.customerId" -> id)

  private def userPatron(user: User): Fu[Option[Patron]] =
    patronColl.uno[Patron]($id(user.id))
}

object PlanApi {

  sealed trait SyncResult
  object SyncResult {
    case object ReloadUser extends SyncResult
    case class Synced(patron: Option[Patron], customer: Option[StripeCustomer]) extends SyncResult
  }
}