/* (c) 2014 - 2016 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.gwc.web;

import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.Component;
import org.geoserver.config.GeoServer;
import org.geoserver.gwc.GWC;
import org.geoserver.gwc.config.GWCConfig;
import org.geoserver.gwc.wmts.WMTSInfo;
import org.geoserver.web.CapabilitiesHomePageLinkProvider;
import org.geoserver.web.CapabilitiesHomePagePanel;
import org.geoserver.web.CapabilitiesHomePagePanel.CapsInfo;
import org.geoserver.web.GeoServerApplication;
import org.geotools.util.Version;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;

/**
 * Implements the {@link CapabilitiesHomePageLinkProvider} extension point to contribute links to
 * GetCapabilities and other service description documents supported by GeoWebCache.
 * 
 * @author Gabriel Roldan
 * @see CapabilitiesHomePagePanel
 */
public class GWCCapabilitiesHomePageProvider implements CapabilitiesHomePageLinkProvider {

    private final GWC gwcFacade;
    private final GeoServer geoServer;

    /**
     * @param gwc
     *            provides access to the {@link GWCConfig configuration} in order to show/hide
     *            getcaps links based on service enablement.
     */
    public GWCCapabilitiesHomePageProvider(GWC gwc, GeoServer geoServer) {
        this.gwcFacade = gwc;
        this.geoServer = geoServer;
    }

    /**
     * Adds capabilities links for WMS-C, WMTS and TMS, as long as they're available.
     * 
     * @see org.geoserver.web.CapabilitiesHomePageLinkProvider#getCapabilitiesComponent
     * @see CapabilitiesHomePagePanel
     */
    public Component getCapabilitiesComponent(final String id) {

        List<CapsInfo> gwcCaps = new ArrayList<CapsInfo>();

        final GeoServerApplication app = GeoServerApplication.get();
        final GWCConfig gwcConfig = gwcFacade.getConfig();

        try {
            if (gwcConfig.isWMSCEnabled() && null != app.getBean("gwcServiceWMS")) {
                gwcCaps.add(new CapsInfo("WMS-C", new Version("1.1.1"),
                        "../gwc/service/wms?request=GetCapabilities&version=1.1.1&tiled=true"));
            }
        } catch (NoSuchBeanDefinitionException e) {
            // service not found, ignore exception
        }

        try {
            if (geoServer.getService(WMTSInfo.class).isEnabled() && null != app.getBean("gwcServiceWMTS")) {
                gwcCaps.add(new CapsInfo("WMTS", new Version("1.0.0"),
                        "../gwc/service/wmts?REQUEST=GetCapabilities"));
            }
        } catch (NoSuchBeanDefinitionException e) {
            // service not found, ignore exception
        }
        try {
            if (gwcConfig.isTMSEnabled() && null != app.getBean("gwcServiceTMS")) {
                gwcCaps.add(new CapsInfo("TMS", new Version("1.0.0"), "../gwc/service/tms/1.0.0"));
            }
        } catch (NoSuchBeanDefinitionException e) {
            // service not found, ignore exception
        }

        return new CapabilitiesHomePagePanel(id, gwcCaps);
    }
}