com.github.triceo.robozonky.strategy.natural.Util Maven / Gradle / Ivy

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/*
 * Copyright 2017 Lukáš Petrovický
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.triceo.robozonky.strategy.natural;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Collection;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.stream.Stream;

import com.github.triceo.robozonky.api.remote.enums.Rating;
import com.github.triceo.robozonky.api.strategies.PortfolioOverview;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class Util {

    private static final Logger LOGGER = LoggerFactory.getLogger(Util.class);

    public static Stream rankRatingsByDemand(final ParsedStrategy strategy,
                                                     final Map currentShare) {
        final SortedMap> mostWantedRatings = new TreeMap<>(Comparator.reverseOrder());
        // put the ratings into buckets based on how much we're missing them
        currentShare.forEach((r, currentRatingShare) -> {
            final int fromStrategy = strategy.getMaximumShare(r);
            final BigDecimal maximumAllowedShare = BigDecimal.valueOf(fromStrategy)
                    .divide(BigDecimal.valueOf(100), 4, RoundingMode.HALF_EVEN);
            final BigDecimal undershare = maximumAllowedShare.subtract(currentRatingShare);
            if (undershare.compareTo(BigDecimal.ZERO) <= 0) { // we over-invested into this rating; do not include
                LOGGER.trace("Rating {} over-invested by {}.", r, undershare.negate());
                return;
            }
            mostWantedRatings.compute(undershare, (k, v) -> {
                if (v == null) {
                    return EnumSet.of(r);
                }
                v.add(r);
                return v;
            });
        });
        return mostWantedRatings.values().stream().flatMap(Collection::stream);
    }

    public static boolean isAcceptable(final ParsedStrategy strategy, final PortfolioOverview portfolio) {
        final int balance = portfolio.getCzkAvailable();
        if (balance < strategy.getMinimumBalance()) {
            return false;
        }
        final int invested = portfolio.getCzkInvested();
        final int investmentCeiling = strategy.getMaximumInvestmentSizeInCzk();
        if (invested >= investmentCeiling) {
            return false;
        }
        return true;
    }
}