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package com.openexchange.data.conversion.ical.ical4j.internal.task;

import java.util.List;
import java.util.TimeZone;
import net.fortuna.ical4j.model.component.VToDo;
import net.fortuna.ical4j.model.property.Status;
import com.openexchange.data.conversion.ical.ConversionError;
import com.openexchange.data.conversion.ical.ConversionWarning;
import com.openexchange.data.conversion.ical.ical4j.internal.AbstractVerifyingAttributeConverter;
import com.openexchange.groupware.contexts.Context;
import com.openexchange.groupware.tasks.Task;

/**
 *
 * @author <a href="mailto:marcus@open-xchange.org">Marcus Klein</a>
 */
public final class State extends AbstractVerifyingAttributeConverter<VToDo, Task> {

    /**
     * Default constructor.
     */
    public State() {
        super();
    }

    /**
     * {@inheritDoc}
     */
    public void emit(final int index, final Task task, final VToDo vtodo,
                     final List<ConversionWarning> warnings, final Context ctx, final Object... args) throws ConversionError {
        try {
            final Status status = new Status(toStatus(index, task.getStatus()).getValue());
            vtodo.getProperties().add(status);
        } catch (final ConversionWarning e) {
            warnings.add(e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public boolean hasProperty(final VToDo vtodo) {
        return null != vtodo.getStatus();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isSet(final Task task) {
        return task.containsStatus();
    }

    /**
     * {@inheritDoc}
     */
    public void parse(final int index, final VToDo vtodo, final Task task, final TimeZone timeZone, final Context ctx,
        final List<ConversionWarning> warnings) throws ConversionError {
        try {
            task.setStatus(toTask(index, vtodo.getStatus()));
        } catch (final ConversionWarning e) {
            warnings.add(e);
        }
    }

    public static Status toStatus(final int index, final int taskState) throws ConversionWarning {
        Status retval = null;
        switch (taskState) {
        case Task.NOT_STARTED:
            retval = Status.VTODO_NEEDS_ACTION;
            break;
        case Task.IN_PROGRESS:
            retval = Status.VTODO_IN_PROCESS;
            break;
        case Task.DONE:
            retval = Status.VTODO_COMPLETED;
            break;
        case Task.WAITING:
        case Task.DEFERRED:
            retval = Status.VTODO_CANCELLED;
            break;
        default:
            throw new ConversionWarning(index, ConversionWarning.Code.INVALID_STATUS,
                Integer.valueOf(taskState));
        }
        return retval;
    }

    public static int toTask(final int index, final Status status) throws ConversionWarning {
        int retval;
        if (Status.VTODO_NEEDS_ACTION.equals(status)) {
            retval = Task.NOT_STARTED;
        } else if (Status.VTODO_IN_PROCESS.equals(status)) {
            retval = Task.IN_PROGRESS;
        } else if (Status.VTODO_COMPLETED.equals(status)) {
            retval = Task.DONE;
        } else if (Status.VTODO_CANCELLED.equals(status)) {
            retval = Task.DEFERRED;
        } else {
            throw new ConversionWarning(index,ConversionWarning.Code.INVALID_STATUS,
                status.getValue());
        }
        return retval;
    }
}
