/*
 * @(#)AuthorizationChain.java
 *
 * Copyright 2011 Instituto Superior Tecnico
 * Founding Authors: Luis Cruz, Nuno Ochoa, Paulo Abrantes
 * 
 *      https://fenix-ashes.ist.utl.pt/
 * 
 *   This file is part of the Expenditure Tracking Module.
 *
 *   The Expenditure Tracking Module is free software: you can
 *   redistribute it and/or modify it under the terms of the GNU Lesser General
 *   Public License as published by the Free Software Foundation, either version 
 *   3 of the License, or (at your option) any later version.
 *
 *   The Expenditure Tracking Module 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with the Expenditure Tracking Module. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package module.mission.domain.util;

import java.io.Serializable;

import module.mission.domain.MissionSystem;
import module.organization.domain.Unit;
import pt.ist.fenixframework.FenixFramework;

/**
 * 
 * @author Luis Cruz
 * 
 */
public class AuthorizationChain implements Serializable {

    private Unit unit;
    private AuthorizationChain next;

    public AuthorizationChain(final Unit unit) {
        setUnit(unit);
    }

    public AuthorizationChain(final Unit unit, final AuthorizationChain next) {
        this(unit);
        setNext(next);
    }

    public Unit getUnit() {
        return unit;
    }

    public void setUnit(Unit unit) {
        this.unit = unit;
    }

    public AuthorizationChain getNext() {
        return next;
    }

    public void setNext(AuthorizationChain next) {
        this.next = next;
    }

    public AuthorizationChain last() {
        return next == null ? this : next.last();
    }

    public String exportAsString() {
        final StringBuilder stringBuilder = new StringBuilder();
        AuthorizationChain authorizationChain = this;
        while (authorizationChain != null) {
            final Unit unit = authorizationChain.getUnit();
            if (stringBuilder.length() > 0) {
                stringBuilder.append('_');
            }
            stringBuilder.append(unit.getExternalId());
            authorizationChain = authorizationChain.next;
        }
        return stringBuilder.toString();
    }

    public String getExportString() {
        return exportAsString();
    }

    public static AuthorizationChain importFromString(final String string) {
        AuthorizationChain authorizationChain = null;
        for (final String externalUnitId : string.split("_")) {
            final Unit unit = FenixFramework.getDomainObject(externalUnitId);
            AuthorizationChain next = new AuthorizationChain(unit);
            if (authorizationChain == null) {
                authorizationChain = next;
            } else {
                authorizationChain.last().setNext(next);
            }
        }
        return authorizationChain;
    }

    public int getChainSize() {
        return next == null ? 1 : next.getChainSize() + 1;
    }

    public boolean isForCurrentInstitution() {
        return next == null ? MissionSystem.getInstance().getOrganizationalModel().getPartiesSet().contains(getUnit()) : next
                .isForCurrentInstitution();
    }
}