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package ch.ninecode.cim

import org.apache.spark.rdd.RDD
import org.apache.spark.rdd.RDD.rddToPairRDDFunctions
import org.apache.spark.sql.SparkSession
import org.apache.spark.storage.StorageLevel
import org.slf4j.LoggerFactory
import ch.ninecode.model._
import org.slf4j.Logger

/**
 * Join CIM files from NIS Strom and SAP ISU.
 *
 * Resolve ServiceLocation objects based on the Name user attribute.
 *
 * @param spark   The session with CIM RDD defined, for which the topology should be calculated
 * @param storage The storage level for new and replaced CIM RDD.
 */
class CIMJoin (spark: SparkSession, storage: StorageLevel) extends CIMRDD with Serializable
{
    implicit val session: SparkSession = spark
    implicit val level: StorageLevel = storage
    implicit val log: Logger = LoggerFactory.getLogger (getClass)

    def unbundle (a: ((Name, ServiceLocation), (Name, ServiceLocation))): (String, (ServiceLocation, ServiceLocation)) =
    {
        (a._2._2.id, (a._1._2, a._2._2))
    }

    def edit_service_location (a: (ServiceLocation, Option[(String, (ServiceLocation, ServiceLocation))])): ServiceLocation =
    {
        a._2 match
        {
            case Some (x) =>
                // for ISU ServiceLocation with a matching NIS ServiceLocation, make a merged one
                val isu = x._2._1
                val nis = x._2._2
                val element = BasicElement (
                    null,
                    isu.WorkLocation.Location.IdentifiedObject.mRID
                )
                val id = IdentifiedObject (
                    element,
                    nis.WorkLocation.Location.IdentifiedObject.aliasName, // aliasName, e.g. ######:nis_el_meter_point
                    isu.WorkLocation.Location.IdentifiedObject.aliasName, // description, e.g. Anschlussobjekt
                    element.mRID, // mRID
                    nis.WorkLocation.Location.IdentifiedObject.name, // name, e.g. MST###
                    nis.WorkLocation.Location.IdentifiedObject.DiagramObjects,
                    nis.WorkLocation.Location.IdentifiedObject.InstanceSet,
                    nis.WorkLocation.Location.IdentifiedObject.Names,
                    nis.WorkLocation.Location.IdentifiedObject.PropertiesCIMDataObject,
                    nis.WorkLocation.Location.IdentifiedObject.TargetingCIMDataObject
                )
                id.bitfields = nis.WorkLocation.Location.IdentifiedObject.bitfields.clone
                IdentifiedObject.fieldsToBitfields ("mRID").zipWithIndex.foreach (x => id.bitfields (x._2) |= x._1)
                val location = Location (
                    id,
                    direction = isu.WorkLocation.Location.direction,
                    electronicAddress = isu.WorkLocation.Location.electronicAddress,
                    geoInfoReference = isu.WorkLocation.Location.geoInfoReference,
                    mainAddress = isu.WorkLocation.Location.mainAddress,
                    phone1 = isu.WorkLocation.Location.phone1,
                    phone2 = isu.WorkLocation.Location.phone2,
                    secondaryAddress = nis.WorkLocation.Location.secondaryAddress, // take any NIS address it might have
                    status = isu.WorkLocation.Location.status,
                    `type` = nis.WorkLocation.Location.`type`, // e.g. geographic
                    Assets = isu.WorkLocation.Location.Assets,
                    ConfigurationEvents = isu.WorkLocation.Location.ConfigurationEvents,
                    CoordinateSystem = nis.WorkLocation.Location.CoordinateSystem, // e.g. wgs_84
                    Crew = isu.WorkLocation.Location.Crew,
                    Crews = isu.WorkLocation.Location.Crews,
                    EnvironmentalLocationKind = isu.WorkLocation.Location.EnvironmentalLocationKind,
                    EnvironmentalMonitoringStation = isu.WorkLocation.Location.EnvironmentalMonitoringStation,
                    Fault = isu.WorkLocation.Location.Fault,
                    Hazards = isu.WorkLocation.Location.Hazards,
                    Incident = isu.WorkLocation.Location.Incident,
                    LandProperties = isu.WorkLocation.Location.LandProperties,
                    Measurements = isu.WorkLocation.Location.Measurements,
                    OutageOrder = isu.WorkLocation.Location.OutageOrder,
                    PositionPoints = nis.WorkLocation.Location.PositionPoints,
                    PowerSystemResources = nis.WorkLocation.Location.PowerSystemResources,
                    Routes = isu.WorkLocation.Location.Routes,
                    SwitchingOrder = isu.WorkLocation.Location.SwitchingOrder,
                    TroubleOrder = isu.WorkLocation.Location.TroubleOrder
                )
                val ibits = Location.fieldsToBitfields ("direction", "electronicAddress", "geoInfoReference", "mainAddress",
                    "phone1", "phone2", "status", "Assets", "ConfigurationEvents", "Crew", "Crews", "EnvironmentalLocationKind",
                    "EnvironmentalMonitoringStation", "Fault", "Hazards", "Incident", "LandProperties",
                    "Measurements", "OutageOrder", "Routes", "SwitchingOrder", "TroubleOrder")
                val nbits = Location.fieldsToBitfields ("secondaryAddress", "type", "CoordinateSystem",
                    "PositionPoints", "PowerSystemResources")
                location.bitfields =
                    isu.WorkLocation.Location.bitfields.clone.zipWithIndex.map (x => x._1 & ibits (x._2)).zip (
                        nis.WorkLocation.Location.bitfields.clone.zipWithIndex.map (x => x._1 & nbits (x._2)))
                        .map (x => x._1 | x._2)
                val worklocation = WorkLocation (
                    location,
                    BaseWorks = isu.WorkLocation.BaseWorks,
                    isu.WorkLocation.DesignLocations,
                    isu.WorkLocation.OneCallRequest
                )
                worklocation.bitfields = isu.WorkLocation.bitfields.clone
                val s = ServiceLocation (
                    worklocation,
                    accessMethod = isu.accessMethod,
                    needsInspection = isu.needsInspection,
                    siteAccessProblem = isu.siteAccessProblem,
                    CustomerAgreements = isu.CustomerAgreements,
                    EndDevices = isu.EndDevices,
                    TroubleTicket = isu.TroubleTicket,
                    UsagePoints = isu.UsagePoints
                )
                s.bitfields = isu.bitfields.clone
                s
            case None =>
                // the default action is to keep the original ServiceLocation (both NIS and ISU) where there isn't a match
                a._1
        }
    }

    def delete_service_location (a: (ServiceLocation, Option[(ServiceLocation, ServiceLocation)])): Boolean =
    {
        a._2 match
        {
            // delete ServiceLocation that match (they were edited already and new ones have an ISU mRID)
            case Some (_) => false
            // keep ServiceLocation without a match
            case None => true
        }
    }

    def edit_position_point (a: (PositionPoint, Option[(ServiceLocation, ServiceLocation)])): PositionPoint =
    {
        a._2 match
        {
            // for PositionPoint with a NIS ServiceLocation, make a new one with the ISU ServiceLocation
            case Some (x) =>
                val p = PositionPoint (
                    BasicElement (null, a._1.id),
                    a._1.groupNumber,
                    a._1.sequenceNumber,
                    a._1.xPosition,
                    a._1.yPosition,
                    a._1.zPosition,
                    x._1.id)
                p.bitfields = a._1.bitfields.clone
                p
            // default is to keep the original PositionPoint where there isn't a match
            case None => a._1
        }
    }

    def edit_user_attribute (a: (UserAttribute, Option[(ServiceLocation, ServiceLocation)])): UserAttribute =
    {
        a._2 match
        {
            // for UserAttribute with a name of a NIS ServiceLocation, make a new one with the name of the ISU ServiceLocation
            case Some (x) =>
                val u = UserAttribute (
                    BasicElement (null, a._1.id),
                    name = x._1.id,
                    sequenceNumber = a._1.sequenceNumber,
                    value = a._1.value,
                    ErpInvoiceLineItems = a._1.ErpInvoiceLineItems,
                    ErpLedgerEntries = a._1.ErpLedgerEntries,
                    ProcedureDataSets = a._1.ProcedureDataSets,
                    PropertySpecification = a._1.PropertySpecification,
                    RatingSpecification = a._1.RatingSpecification,
                    Transaction = a._1.Transaction
                )
                u.bitfields = a._1.bitfields.clone
                UserAttribute.fieldsToBitfields ("name").zipWithIndex.foreach (x => u.bitfields (x._2) |= x._1)
                u
            // default is to keep the original UserAttribute where there isn't a match
            case None => a._1
        }
    }

    def delete_name (a: (Name, Option[(ServiceLocation, ServiceLocation)])): Boolean =
    {
        a._2 match
        {
            // delete Name that matches (it was used to perform the join already)
            case Some (_) => false
            // keep Name without a match
            case None => true
        }
    }

    /**
     * Join NIS CIM file with ISU CIM file.
     *
     * The join uses the Name objects that contain both the SAP ISU id and the NIS number.
     * The tasks are:
     *
     * 1. Create new (or edit) the SAP ServiceLocation objects with:
     * - mRID (rdf:ID) is the SAP ISU number (unchanged)
     * - IdentifiedObject.name is the NIS number
     * - IdentifiedObject.aliasName is the NIS internal id and class name
     * - IdentifiedObject.description is the ISU description (aliasName)
     * - Location.mainAddress is the ISU address data (unchanged)
     * 1. Change the location attribute of the PositionPoint object for the NIS ServiceLocation
     * to point to the ISU ServiceLocation (i.e. replace MST# with ISU#)
     * 1. Change the UserAttribute objects that link the EnergyConsumer to ServiceLocation
     * to point to the new (or edited) SAP ServiceLocation (i.e. replace MST# with ISU#)
     * 1. Optionally delete the NIS ServiceLocation
     * 1. Optionally delete the old Name object referencing the NIS ServiceLocation
     * (this should clean out the Name RDD I think)
     * 1. Create a new Name object with the reverse orientation
     * (Name.name = NIS MST# and Name.IdentifiedObject = SAP ISU#)
     * [Not required if NIS ServiceLocation is deleted]
     *
     * So, in summary, edit these RDD:
     * - ServiceLocation (merge & delete)
     * - PositionPoint (edit)
     * - UserAttribute (edit)
     * - Name (delete)
     *
     * @return The updated Elements RDD.
     */
    def do_join (): RDD[Element] =
    {
        log.info ("joining ISU and NIS")

        val names = getOrElse [Name]
        val service_locations = getOrElse [ServiceLocation]
        val points = getOrElse [PositionPoint]
        val attributes = getOrElse [UserAttribute]
        val work_loc = getOrElse [WorkLocation]
        val locations = getOrElse [Location]
        val idobj = getOrElse [IdentifiedObject]

        // get only the cim:Name objects pertaining to the ServiceLocation join
        val isusl = names.keyBy (_.name).join (service_locations.keyBy (_.id)).values
        val nissl = names.keyBy (_.IdentifiedObject).join (service_locations.keyBy (_.id)).values

        // construct a useful intermediate representation of the cim:Name objects
        val pairs = isusl.keyBy (_._1.id).join (nissl.keyBy (_._1.id)).values.map (unbundle)

        // step 1, edit (replace) ISU ServiceLocation that have a corresponding NIS ServiceLocation
        val temp_locations = service_locations.keyBy (_.id).leftOuterJoin (pairs.keyBy (_._2._1.id)).values.map (edit_service_location)
        // step 4, delete the NIS ServiceLocations that have a corresponding ISU ServiceLocation
        val updated_locations = temp_locations.keyBy (_.id).leftOuterJoin (pairs).values.filter (delete_service_location).map (_._1)
        service_locations.name = "unjoined_ServiceLocation"
        ServiceLocation.subsetter.save (session.sqlContext, updated_locations.asInstanceOf [ServiceLocation.subsetter.rddtype], storage)

        // step 2, change the Location attribute of affected PositionPoint
        val updated_points = points.keyBy (_.Location).leftOuterJoin (pairs).values.map (edit_position_point)
        points.name = "unjoined_PositionPoint"
        PositionPoint.subsetter.save (session.sqlContext, updated_points.asInstanceOf [PositionPoint.subsetter.rddtype], storage)

        // step 3, change the name attribute of affected UserAttribute
        val updated_attributes = attributes.keyBy (_.name).leftOuterJoin (pairs).values.map (edit_user_attribute)
        attributes.name = "unjoined_UserAttribute"
        UserAttribute.subsetter.save (session.sqlContext, updated_attributes.asInstanceOf [UserAttribute.subsetter.rddtype], storage)

        // step 5 and 6, delete the Name objects that are no longer needed
        val updated_names = names.keyBy (_.IdentifiedObject).leftOuterJoin (pairs).values.filter (delete_name).map (_._1)
        names.name = "unjoined_Name"
        Name.subsetter.save (session.sqlContext, updated_names.asInstanceOf [Name.subsetter.rddtype], storage)

        // replace service locations in WorkLocation
        val updated_worklocations_pairrdd = updated_locations.map (_.WorkLocation).keyBy (_.id)
        val new_work_loc = work_loc.keyBy (_.id).leftOuterJoin (updated_worklocations_pairrdd).
            values.flatMap (
            (arg: (WorkLocation, Option[WorkLocation])) =>
                arg._2 match
                {
                    case Some (x) => List (x)
                    case None => List (arg._1)
                }
        )
        work_loc.name = "unjoined_WorkLocation"
        WorkLocation.subsetter.save (session.sqlContext, new_work_loc.asInstanceOf [WorkLocation.subsetter.rddtype], storage)

        // replace service locations in Location
        val new_loc = locations.keyBy (_.id).leftOuterJoin (updated_locations.map (_.WorkLocation.Location).keyBy (_.id)).
            values.flatMap (
            (arg: (Location, Option[Location])) =>
                arg._2 match
                {
                    case Some (x) => List (x)
                    case None => List (arg._1)
                }
        )
        locations.name = "unjoined_Location"
        Location.subsetter.save (session.sqlContext, new_loc.asInstanceOf [Location.subsetter.rddtype], storage)

        // replace identified objects in IdentifiedObject
        val new_idobj = idobj.keyBy (_.id).leftOuterJoin (locations.map (_.IdentifiedObject).keyBy (_.id)).
            values.flatMap (
            (arg: (IdentifiedObject, Option[IdentifiedObject])) =>
                arg._2 match
                {
                    case Some (x) => List (x)
                    case None => List (arg._1)
                }
        )
        idobj.name = "unjoined_IdentifiedObject"
        IdentifiedObject.subsetter.save (session.sqlContext, new_idobj.asInstanceOf [IdentifiedObject.subsetter.rddtype], storage)

        // make a union of all new RDD as Element
        val newelem = updated_points.asInstanceOf[RDD[Element]].
            union (updated_attributes.asInstanceOf [RDD[Element]]).
            union (updated_names.asInstanceOf [RDD[Element]]).
            union (updated_locations.asInstanceOf [RDD[Element]])

        // replace elements in Elements
        val old_elements = getOrElse [Element]("Elements")
        val new_elements = old_elements.keyBy (_.id).leftOuterJoin (newelem.keyBy (_.id)).
            values.flatMap (
            (arg: (Element, Option[Element])) =>
                arg._2 match
                {
                    case Some (x) => List (x)
                    case None => List (arg._1)
                }
        )

        // swap the old Elements RDD for the new one
        put (new_elements, "Elements", false)

        new_elements
    }
}




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