/**
 * DataCleaner (community edition)
 * Copyright (C) 2014 Neopost - Customer Information Management
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.datacleaner.widgets.properties;

import java.util.Collection;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;

import org.datacleaner.descriptors.ConfiguredPropertyDescriptor;
import org.datacleaner.job.builder.ComponentBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Contains the {@link PropertyWidget}s of a particular component
 */
public class PropertyWidgetCollection {

    private static final Logger logger = LoggerFactory.getLogger(PropertyWidgetCollection.class);

    private final ComponentBuilder _componentBuilder;
    private final Map<ConfiguredPropertyDescriptor, PropertyWidget<?>> _widgets;
    private final Map<ConfiguredPropertyDescriptor, PropertyWidgetMapping> _propertyWidgetMappings;

    public PropertyWidgetCollection(final ComponentBuilder componentBuilder) {
        _componentBuilder = componentBuilder;
        _widgets = new HashMap<>();
        _propertyWidgetMappings = new IdentityHashMap<>();

        logger.debug("id={} - init", System.identityHashCode(this));
    }

    public Collection<PropertyWidget<?>> getWidgets() {
        return _widgets.values();
    }

    public PropertyWidget<?> getWidget(final ConfiguredPropertyDescriptor propertyDescriptor) {
        return _widgets.get(propertyDescriptor);
    }

    public void putMappedPropertyWidget(final ConfiguredPropertyDescriptor mappedProperty,
            final PropertyWidgetMapping propertyWidgetMapping) {
        _propertyWidgetMappings.put(mappedProperty, propertyWidgetMapping);
    }

    public PropertyWidget<?> getMappedPropertyWidget(final ConfiguredPropertyDescriptor propertyDescriptor) {
        final PropertyWidgetMapping existingMapping = _propertyWidgetMappings.get(propertyDescriptor);
        if (existingMapping != null) {
            final PropertyWidget<?> propertyWidget = existingMapping.getMapping(propertyDescriptor);
            if (propertyWidget != null) {
                return propertyWidget;
            }
        }
        return null;
    }

    /**
     * Registers a widget in this factory in rare cases when the factory is not
     * used to actually instantiate the widget, but it is still needed to
     * register the widget for compliancy with eg. the onConfigurationChanged()
     * behaviour.
     *
     * @param propertyDescriptor
     * @param widget
     */
    public void registerWidget(final ConfiguredPropertyDescriptor propertyDescriptor, final PropertyWidget<?> widget) {
        if (widget == null) {
            _widgets.remove(propertyDescriptor);
        } else {
            _widgets.put(propertyDescriptor, widget);
            @SuppressWarnings("unchecked") final PropertyWidget<Object> objectWidget = (PropertyWidget<Object>) widget;
            final Object value = _componentBuilder.getConfiguredProperty(objectWidget.getPropertyDescriptor());
            objectWidget.initialize(value);
        }
    }

    /**
     * Invoked whenever a configured property within this widget factory is
     * changed.
     */
    public void onConfigurationChanged() {
        final Collection<PropertyWidget<?>> widgets = getWidgets();

        if (logger.isDebugEnabled()) {
            final StringBuilder sb = new StringBuilder();
            sb.append("id=");
            sb.append(System.identityHashCode(this));
            sb.append(" - onConfigurationChanged() - notifying widgets:");
            sb.append(widgets.size());
            for (final PropertyWidget<?> widget : widgets) {
                final String propertyName = widget.getPropertyDescriptor().getName();
                final String propertyWidgetClassName = widget.getClass().getSimpleName();
                sb.append("\n - ");
                sb.append(propertyName);
                sb.append(": ");
                sb.append(propertyWidgetClassName);
            }

            logger.debug(sb.toString());
        }

        for (final PropertyWidget<?> widget : widgets) {
            @SuppressWarnings("unchecked") final PropertyWidget<Object> objectWidget = (PropertyWidget<Object>) widget;
            final ConfiguredPropertyDescriptor propertyDescriptor = objectWidget.getPropertyDescriptor();
            final Object value = _componentBuilder.getConfiguredProperty(propertyDescriptor);
            objectWidget.onValueTouched(value);
        }
    }
}