package ddth.dasp.framework.springmvc;

import javax.servlet.http.HttpServletRequest;

import org.osgi.framework.BundleContext;
import org.springframework.osgi.context.BundleContextAware;
import org.springframework.web.context.support.WebApplicationObjectSupport;

import ddth.dasp.common.rp.IRequestParser;
import ddth.dasp.common.utils.DaspConstants;
import ddth.dasp.common.utils.OsgiUtils;
import ddth.dasp.framework.utils.SpringUtils;

/**
 * Use this class as starting point for application SpringMVC's controllers.
 * 
 * @author NBThanh <btnguyen2k@gmail.com>
 * @version since v0.1.0
 */
public abstract class BaseController extends WebApplicationObjectSupport implements
        BundleContextAware {

    private BundleContext bundleContext;

    /**
     * Gets a Spring bean by class.
     * 
     * @param clazz
     * @return
     */
    protected <T> T getBean(Class<T> clazz) {
        return SpringUtils.getBean(getApplicationContext(), clazz);
    }

    /**
     * Gets a Spring bean by id/name and class.
     * 
     * @param name
     * @param clazz
     * @return
     */
    protected <T> T getBean(String name, Class<T> clazz) {
        return SpringUtils.getBean(getApplicationContext(), name, clazz);
    }

    /**
     * Gets an OSGi service by class.
     * 
     * @param clazz
     * @return
     */
    protected <T> T getService(Class<T> clazz) {
        return OsgiUtils.getService(bundleContext, clazz);
    }

    /**
     * Gets the {@link BundleContext} instance.
     * 
     * @return
     */
    protected BundleContext getBundleContext() {
        return bundleContext;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setBundleContext(BundleContext bundleContext) {
        this.bundleContext = bundleContext;
    }

    /**
     * Gets the associated {@link IRequestParser} instance.
     * 
     * @param request
     * @return
     */
    protected IRequestParser getRequestParser(HttpServletRequest request) {
        return (IRequestParser) request.getAttribute(DaspConstants.REQ_ATTR_REQUEST_PARSER);
    }

    /**
     * Gets the request module name.
     * 
     * @param request
     * @return
     */
    protected String getRequestModule(HttpServletRequest request) {
        IRequestParser rp = getRequestParser(request);
        return rp.getRequestModule();
    }

    /**
     * Gets the request action name.
     * 
     * @param request
     * @return
     */
    protected String getRequestAction(HttpServletRequest request) {
        IRequestParser rp = getRequestParser(request);
        return rp.getRequestAction();
    }
}