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package br.com.anteros.spring.web.config;

import java.util.EnumSet;

import javax.servlet.FilterRegistration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration.Dynamic;
import javax.servlet.SessionTrackingMode;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.DelegatingFilterProxy;
import org.springframework.web.servlet.DispatcherServlet;

import br.com.anteros.spring.web.support.OpenSQLSessionInViewFilter;

public abstract class AbstractSpringWebAppInitializer implements WebApplicationInitializer{
	
	private static final String SPRING_SECURITY_FILTER_CHAIN = "springSecurityFilterChain";
	private static final String DISPATCHER = "dispatcher";
	private static final String OPEN_SQL_SESSION_IN_VIEW_FILTER = "OpenSQLSessionInViewFilter";
	private static final String ANTEROS_CORS_FILTER = "anterosCorsFilter";
	private static final String ANTEROS_RESPONSE_HEADER_FILTER = "anterosResponseHeaderFilter";
	

	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
		AnnotationConfigWebApplicationContext appContext = new AnnotationConfigWebApplicationContext();
		appContext.setServletContext(servletContext);
		
		servletContext.setSessionTrackingModes(EnumSet.of(SessionTrackingMode.COOKIE));
		servletContext.getSessionCookieConfig().setHttpOnly(true);        
		servletContext.getSessionCookieConfig().setSecure(true);   
		
		if (registerFirstConfigurationClasses() != null) {
			for (Class clz : registerFirstConfigurationClasses()) {
				appContext.register(clz);
			}
		}
		
		if (persistenceConfigurationClass() != null) {
			appContext.register(persistenceConfigurationClass());
		}
		
		if (mvcConfigurationClass() != null) {
			appContext.register(mvcConfigurationClass());
		}
		
		if (securityConfigurationClass() != null) {
			appContext.register(securityConfigurationClass());
		}
		
		if (globalMethodConfigurationClass() != null) {
			appContext.register(globalMethodConfigurationClass());
		}
		
		if (resourceServerConfigurationClass() != null) {
			appContext.register(resourceServerConfigurationClass());
		}
		
		if (oauth2ServerConfigurationClass() != null) {
			appContext.register(oauth2ServerConfigurationClass());
		}
		
		if (registerLastConfigurationClasses() != null) {
			for (Class clz : registerLastConfigurationClasses()) {
				appContext.register(clz);
			}
		}
		
		appContext.setServletContext(servletContext);
		servletContext.addListener(new ContextLoaderListener(appContext));

		addListener(servletContext);
		addServlet(servletContext, appContext);

		
		Dynamic servlet = servletContext.addServlet(DISPATCHER, new DispatcherServlet(appContext));
		servlet.addMapping("/");
		servlet.setLoadOnStartup(1);
		
		FilterRegistration.Dynamic filter = servletContext.addFilter(ANTEROS_CORS_FILTER, AnterosCorsFilter.class);
		filter.addMappingForUrlPatterns(null, false, "/*");
		
		FilterRegistration.Dynamic openSQLSessionInViewFilterChain = servletContext.addFilter(OPEN_SQL_SESSION_IN_VIEW_FILTER,
				OpenSQLSessionInViewFilter.class);
		openSQLSessionInViewFilterChain.addMappingForUrlPatterns(null, false, "/*");

		FilterRegistration.Dynamic springSecurityFilterChain = servletContext.addFilter(SPRING_SECURITY_FILTER_CHAIN,
				DelegatingFilterProxy.class);
		springSecurityFilterChain.addMappingForUrlPatterns(null, false, "/*");
		
		FilterRegistration.Dynamic responseHeaderFilterChain = servletContext.addFilter(ANTEROS_RESPONSE_HEADER_FILTER,
				AnterosResponseHeaderFilter.class);
		responseHeaderFilterChain.addMappingForUrlPatterns(null, false, "/*");
		appContext.close();
		
		
	}
	
	public abstract Class oauth2ServerConfigurationClass();

	public abstract Class resourceServerConfigurationClass();

	public abstract Class globalMethodConfigurationClass();
	
	public abstract Class securityConfigurationClass();

	public abstract Class mvcConfigurationClass();
	
	public abstract Class[] persistenceConfigurationClass();
	
	public abstract Class[] registerFirstConfigurationClasses();

	public abstract Class[] registerLastConfigurationClasses();
	
	public abstract void addListener(ServletContext servletContext);

	public abstract void addServlet(ServletContext servletContext, AnnotationConfigWebApplicationContext appContext);

}