package pt.ist.renderers.servlets;

import java.util.Set;

import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.HandlesTypes;

import org.apache.struts.util.RequestUtils;

import pt.ist.renderers.annotation.Renderer;
import pt.ist.renderers.annotation.RenderersConfiguration;
import pt.ist.renderers.model.MetaObjectFactory;
import pt.ist.renderers.model.SchemaFactory;
import pt.ist.renderers.model.UserIdentityFactory;
import pt.ist.renderers.plugin.ConfigurationReader;

@HandlesTypes({ RenderersConfiguration.class, Renderer.class })
public class RenderersFrameworkInitializer implements ServletContainerInitializer {
    @Override
    public void onStartup(Set<Class<?>> classes, ServletContext context) throws ServletException {
	if (classes != null) {
	    for (Class<?> clazz : classes) {
		RenderersConfiguration config = clazz.getAnnotation(RenderersConfiguration.class);
		if (config != null) {

		    ConfigurationReader reader = new ConfigurationReader(config.renderers(), config.schemas());
		    reader.readAll(context);

		    if (!config.metaObjectFactory().equals(MetaObjectFactory.class)) {
			try {
			    MetaObjectFactory metaObjectFactory = (MetaObjectFactory) RequestUtils.applicationInstance(config
				    .metaObjectFactory().getName());
			    MetaObjectFactory.setCurrentFactory(metaObjectFactory);
			} catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
			    throw new ServletException(e);
			}
		    }

		    if (!config.userIdentityFactory().equals(UserIdentityFactory.class)) {
			try {
			    UserIdentityFactory userIdFactory = (UserIdentityFactory) RequestUtils.applicationInstance(config
				    .userIdentityFactory().getName());
			    UserIdentityFactory.setCurrentFactory(userIdFactory);
			} catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
			    throw new ServletException(e);
			}
		    }

		    if (!config.schemaFactory().equals(SchemaFactory.class)) {
			try {
			    SchemaFactory schemaFactory = (SchemaFactory) RequestUtils.applicationInstance(config.schemaFactory()
				    .getName());
			    SchemaFactory.setCurrentFactory(schemaFactory);
			} catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
			    throw new ServletException(e);
			}
		    }
		}
	    }
	}
    }
}