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package atom.ws.model;

import atom.app.Activity;
import atom.app.ActivityList;
import atom.app.ActivityThread;
import atom.beans.AbstractPropertyChange;
import atom.beans.ChangeSet;
import atom.content.Intent;

import java.beans.PropertyChangeEvent;
import java.util.ArrayList;
import java.util.List;

/**
 * Provides a common way of creation {@link atom.beans.ChangeSet} from
 * {@link atom.app.ActivityThread}.
 *
 * @author Serge Voloshyn
 * @version 1.4 3/1/15
 */
public final class ChangeSetFactory {
    /**
     * Hidden constructor.
     */
    private ChangeSetFactory() {
        super();
    }

    /**
     * Prepares changeSet for current activity thread after processing.
     *
     * @param clientLayers existing client's layers
     * @param thread       current activity thread
     * @return change set
     */
    public static List prepareChangeSet(
            final List clientLayers,
            final ActivityThread thread) {
        final boolean redraw = thread.redraw();
        final List result = new ArrayList<>(1);

        final ActivityList changedList = thread.getChangedActivities();
        final ActivityList currentList = thread.getCurrentActivities();

        for (int layer = 0; layer < changedList.length(); layer++) {
            final Activity current = currentList.get(layer);
            final Activity changed = changedList.remove(layer);

            final boolean existingLayer = clientLayers.contains(layer);
            final boolean notDefaultLayer = layer != Intent.LAYER_DEFAULT;

            if (!redraw && existingLayer
                    && changed != null && current != null
                    && current == changed) {
                final List changes
                        = changed.getChanges();
                if (changes != null && !changes.isEmpty()) {
                    final ChangeSet change = newChangeSet(layer, changed);
                    change.setDisplayChanges(
                            AbstractPropertyChange.valueListOf(changes));
                    result.add(change);
                }
            } else if (changed != null) {
                final ChangeSet change = newChangeSet(layer, changed);
                change.setDisplay(changed.getWindow());
                result.add(change);
            } else if (existingLayer && notDefaultLayer) {
                final ChangeSet removed = new ChangeSet(layer);
                removed.setRemoved(true);
                result.add(removed);
            }

            if (changed != null || notDefaultLayer) {
                currentList.set(layer, changed);
            }
        }
        return result;
    }

    /**
     * Create new change set for layer.
     * 
     * If default layer is being used for current activity token definition
     * will be added into change set.
     *
     * @param layer    activity layer
     * @param activity current activity
     * @return new change set for layer
     */
    private static ChangeSet newChangeSet(final int layer,
                                          final Activity activity) {
        final ChangeSet changeSet = new ChangeSet(layer);
        if (Intent.LAYER_DEFAULT == layer) {
            final Intent resultingIntent = activity.getIntent();
            final String token
                    = IntentTokenConverter.toToken(resultingIntent);
            changeSet.setToken(token);
        }
        return changeSet;
    }
}