package module.mission.presentationTier.provider;

import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.Set;
import java.util.TreeSet;

import module.mission.domain.MissionProcess;
import module.mission.domain.activity.ItemActivityInformation;
import pt.ist.fenixWebFramework.renderers.DataProvider;
import pt.ist.fenixWebFramework.renderers.components.converters.Converter;
import pt.ist.fenixframework.FenixFramework;
import pt.ist.fenixframework.dml.DomainClass;
import pt.ist.fenixframework.dml.DomainModel;

public class RelativeMissionItemTypeProvider implements DataProvider {

    @Override
    public Converter getConverter() {
        return null;
    }

    @Override
    public Object provide(final Object source, final Object currentValue) {
        final ItemActivityInformation itemActivityInformation = (ItemActivityInformation) source;
        final MissionProcess missionProcess = itemActivityInformation.getProcess();
        final Class topLevelMissionItemType = itemActivityInformation.getTopLevelMissionItemType();
        return getMissionItemTypes(topLevelMissionItemType);
    }

    public Collection<Class> getMissionItemTypes(final Class topLevelMissionItemType) {
        final Set<Class> missionItemTypes = new TreeSet<Class>(TopLevelMissionItemTypeProvider.CLASS_COMPARATOR_BY_NAME);
        if (topLevelMissionItemType != null) {
            final DomainModel domainModel = FenixFramework.getDomainModel();
            for (final DomainClass domainClass : domainModel.getDomainClasses()) {
                if (isMissionItemSubclass(topLevelMissionItemType, domainClass)) {
                    try {
                        final Class clazz = Class.forName(domainClass.getFullName());
                        if (!Modifier.isAbstract(clazz.getModifiers())) {
                            missionItemTypes.add(clazz);
                        }
                    } catch (final ClassNotFoundException e) {
                        throw new Error(e);
                    }
                }
            }
        }
        return missionItemTypes;
    }

    private boolean isMissionItemSubclass(final Class topLevelMissionItemType, final DomainClass domainClass) {
        return domainClass != null
                && (domainClass.getFullName().equals(topLevelMissionItemType.getName()) || isMissionItemSubclass(
                        topLevelMissionItemType, (DomainClass) domainClass.getSuperclass()));
    }

}