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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.energidataservice.internal;
  14
  15 import java.math.BigDecimal;
  16 import java.time.Clock;
  17 import java.time.Instant;
  18 import java.time.LocalDateTime;
  19 import java.time.LocalTime;
  20 import java.time.temporal.ChronoUnit;
  21 import java.util.Collection;
  22 import java.util.Map;
  23 import java.util.Map.Entry;
  24 import java.util.concurrent.ConcurrentHashMap;
  25
  26 import org.eclipse.jdt.annotation.NonNullByDefault;
  27 import org.eclipse.jdt.annotation.Nullable;
  28 import org.openhab.binding.energidataservice.internal.api.dto.DatahubPricelistRecord;
  29
  30 /**
  31  * Parses results from {@link org.openhab.binding.energidataservice.internal.api.dto.DatahubPricelistRecords}
  32  * into map of hourly tariffs.
  33  *
  34  * @author Jacob Laursen - Initial contribution
  35  */
  36 @NonNullByDefault
  37 public class PriceListParser {
  38
  39     private final Clock clock;
  40
  41     public PriceListParser() {
  42         this(Clock.system(EnergiDataServiceBindingConstants.DATAHUB_TIMEZONE));
  43     }
  44
  45     public PriceListParser(Clock clock) {
  46         this.clock = clock;
  47     }
  48
  49     public Map<Instant, BigDecimal> toHourly(Collection<DatahubPricelistRecord> records) {
  50         Map<Instant, BigDecimal> totalMap = new ConcurrentHashMap<>(CacheManager.TARIFF_MAX_CACHE_SIZE);
  51         records.stream().map(record -> record.chargeTypeCode()).distinct().forEach(chargeTypeCode -> {
  52             Map<Instant, BigDecimal> currentMap = toHourly(records, chargeTypeCode);
  53             for (Entry<Instant, BigDecimal> current : currentMap.entrySet()) {
  54                 BigDecimal total = totalMap.get(current.getKey());
  55                 if (total == null) {
  56                     total = BigDecimal.ZERO;
  57                 }
  58                 totalMap.put(current.getKey(), total.add(current.getValue()));
  59             }
  60         });
  61
  62         return totalMap;
  63     }
  64
  65     public Map<Instant, BigDecimal> toHourly(Collection<DatahubPricelistRecord> records, String chargeTypeCode) {
  66         Map<Instant, BigDecimal> tariffMap = new ConcurrentHashMap<>(CacheManager.TARIFF_MAX_CACHE_SIZE);
  67
  68         Instant firstHourStart = Instant.now(clock).minus(CacheManager.NUMBER_OF_HISTORIC_HOURS, ChronoUnit.HOURS)
  69                 .truncatedTo(ChronoUnit.HOURS);
  70         Instant lastHourStart = Instant.now(clock).truncatedTo(ChronoUnit.HOURS).plus(2, ChronoUnit.DAYS)
  71                 .truncatedTo(ChronoUnit.DAYS);
  72
  73         LocalDateTime previousValidFrom = LocalDateTime.MAX;
  74         LocalDateTime previousValidTo = LocalDateTime.MIN;
  75         Map<LocalTime, BigDecimal> tariffs = Map.of();
  76         for (Instant hourStart = firstHourStart; hourStart
  77                 .isBefore(lastHourStart); hourStart = hourStart.plus(1, ChronoUnit.HOURS)) {
  78             LocalDateTime localDateTime = hourStart.atZone(EnergiDataServiceBindingConstants.DATAHUB_TIMEZONE)
  79                     .toLocalDateTime();
  80             if (localDateTime.compareTo(previousValidFrom) < 0 || localDateTime.compareTo(previousValidTo) >= 0) {
  81                 DatahubPricelistRecord priceList = getTariffs(records, localDateTime, chargeTypeCode);
  82                 if (priceList != null) {
  83                     tariffs = priceList.getTariffMap();
  84                     previousValidFrom = priceList.validFrom();
  85                     previousValidTo = priceList.validTo();
  86                 } else {
  87                     tariffs = Map.of();
  88                 }
  89             }
  90
  91             LocalTime localTime = LocalTime
  92                     .of(hourStart.atZone(EnergiDataServiceBindingConstants.DATAHUB_TIMEZONE).getHour(), 0);
  93             BigDecimal tariff = tariffs.get(localTime);
  94             if (tariff != null) {
  95                 tariffMap.put(hourStart, tariff);
  96             }
  97         }
  98
  99         return tariffMap;
 100     }
 101
 102     private @Nullable DatahubPricelistRecord getTariffs(Collection<DatahubPricelistRecord> records,
 103             LocalDateTime localDateTime, String chargeTypeCode) {
 104         return records.stream()
 105                 .filter(record -> localDateTime.compareTo(record.validFrom()) >= 0
 106                         && localDateTime.compareTo(record.validTo()) < 0
 107                         && record.chargeTypeCode().equals(chargeTypeCode))
 108                 .findFirst().orElse(null);
 109     }
 110 }