/*
 * Import Process Delete
 * Copyright (C) 2020 Memoriav
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package ch.memobase

import java.text.SimpleDateFormat
import java.util.Calendar

import ch.memobase.models.Report
import org.apache.kafka.clients.consumer.ConsumerRecord
import org.apache.logging.log4j.scala.Logging

import scala.collection.JavaConverters._
import scala.util.{Failure, Success, Try}

trait MsgFilter {
  self: Logging =>

  private val dateFormatter = new SimpleDateFormat("YYYY-MM-dd'T'HH:mm:ss.SSS")

  type FilterFun = ConsumerRecord[String, String] => Boolean

  def buildFilters(createdAfter: Calendar,
                   createdBefore: Calendar,
                   institutions: Seq[String],
                   recordSets: Seq[String],
                   records: Seq[String],
                   sessions: Seq[String]): Seq[FilterFun] =
    Seq(buildStepFilter("fedora-ingest")) ++
      Seq(buildStatusFilter("SUCCESS")) ++
      Seq(buildCreatedAfterFilter(standardiseTimestamp(createdAfter))) ++
      Seq(buildCreatedBeforeFilter(standardiseTimestamp(createdBefore))) ++
      institutions.map(v => buildInstitutionIdFilter(v)) ++
      records.map(v => buildRecordIdFilter(v)) ++
      recordSets.map(v => buildRecordSetIdFilter(v)) ++
      sessions.map(v => buildSessionIdFilter(v))


  private def standardiseTimestamp(calendar: Calendar): String =
    f"${calendar.get(Calendar.YEAR)}%04d-" +
      f"${calendar.get(Calendar.MONTH)}%02d-" +
      f"${calendar.get(Calendar.DAY_OF_MONTH)}%02dT" +
      f"${calendar.get(Calendar.HOUR_OF_DAY)}%02d:" +
      f"${calendar.get(Calendar.MINUTE)}%02d:" +
      f"${calendar.get(Calendar.SECOND)}%02d." +
      f"${calendar.get(Calendar.MILLISECOND)}%03d"

  private val buildSessionIdFilter: String => FilterFun =
    sessionId => rec =>
      rec.headers()
        .headers("sessionId")
        .asScala
        .map(header => new String(header.value()))
        .exists(v => v == sessionId)

  private val buildRecordSetIdFilter: String => FilterFun =
    recordSetId => rec =>
      rec.headers()
        .headers("recordSetId")
        .asScala
        .map(header => new String(header.value()))
        .exists(v => v == recordSetId)

  private val buildInstitutionIdFilter: String => FilterFun =
    institutionId => rec =>
      rec.headers()
        .headers("institutionId")
        .asScala
        .map(header => new String(header.value()))
        .exists(v => v == institutionId)

  private val buildRecordIdFilter: String => FilterFun =
    recordId => rec =>
      Report(rec.value()).id == recordId

  private val buildCreatedAfterFilter: String => FilterFun =
    timestamp => rec =>
      Try {
        dateFormatter.parse(timestamp).after(dateFormatter.parse(Report(rec.value()).timestamp))
      } match {
        case Success(res) => res
      case Failure(_) =>
        logger.warn(s"Parsing of timestamp ${Report(rec.value()).timestamp} failed! Ignoring record")
        false
      }

  private val buildCreatedBeforeFilter: String => FilterFun =
    timestamp => rec =>
      Try {
        dateFormatter.parse(timestamp).before(dateFormatter.parse(Report(rec.value()).timestamp))
      } match {
        case Success(res) => res
        case Failure(_) =>
          logger.warn(s"Parsing of timestamp ${Report(rec.value()).timestamp} failed! Ignoring record")
          false
      }


  private val buildStatusFilter: String => FilterFun =
    status => rec => Report(rec.value()).status == status

  private val buildStepFilter: String => FilterFun =
    step => rec => Report(rec.value()).step == step

}