/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

package org.libreplan.business.planner.entities.consolidations;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.SortedSet;

import org.joda.time.LocalDate;
import org.libreplan.business.common.BaseEntity;
import org.libreplan.business.planner.entities.Task;
import org.libreplan.business.workingday.EffortDuration;

/**
 * @author Susana Montes Pedreira <smontes@wirelessgalicia.com>
 */
public abstract class Consolidation extends BaseEntity {

    public abstract SortedSet<? extends ConsolidatedValue> getConsolidatedValues();

    public abstract boolean isCalculated();

    public abstract boolean isEmpty();

    private Task task;

    protected Consolidation() {

    }

    protected Consolidation(Task task) {
        this.task = task;
    }

    public void setTask(Task task) {
        this.task = task;
    }

    public Task getTask() {
        return task;
    }

    public LocalDate getConsolidatedUntil() {
        SortedSet<? extends ConsolidatedValue> consolidatedValues = getConsolidatedValues();
        return (consolidatedValues.isEmpty()) ? null : consolidatedValues
                .last().getDate();
    }

    public EffortDuration getNotConsolidated(EffortDuration total) {
        BigDecimal notConsolidatedProportion = getNotConsolidatedProportion();
        int notConsolidatedSecons = notConsolidatedProportion.multiply(
                new BigDecimal(total.getSeconds())).intValue();
        return EffortDuration.seconds(notConsolidatedSecons);
    }

    public EffortDuration getTotalFromNotConsolidated(
            EffortDuration notConsolidated) {
        if (isCompletelyConsolidated()) {
            throw new IllegalStateException(
                    "Can't calculate the total using a completely consolidated consolidation");
        }
        BigDecimal notConsolidatedDecimal = new BigDecimal(
                notConsolidated.getSeconds()).setScale(2);
        int totalSeconds = notConsolidatedDecimal
                .divide(getNotConsolidatedProportion(), RoundingMode.DOWN)
                .intValue();
        return EffortDuration.seconds(totalSeconds);
    }

    public boolean isCompletelyConsolidated() {
        return getNotConsolidatedProportion().signum() == 0;
    }

    private BigDecimal getNotConsolidatedProportion() {
        return BigDecimal.ONE.subtract(getConsolidatedProportion());
    }

    private BigDecimal getConsolidatedProportion() {
        return getConsolidatedPercentage().setScale(2).divide(
                new BigDecimal(100), RoundingMode.DOWN);
    }

    private BigDecimal getConsolidatedPercentage() {
        return getConsolidatedValues().isEmpty() ? BigDecimal.ZERO
                : getConsolidatedValues().last().getValue();
    }

}