package ch.psi.daq.rest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;

import ch.psi.daq.cassandra.config.CassandraConfig;

/**
 * Entry point to our rest-frontend of the Swissfel application which most importantly wires all the @RestController annotated classes.
 * <p>
 * 
 * This acts as a @Configuration class for Spring. As such it has @ComponentScan
 * annotation that enables scanning for another Spring components in current
 * package and its subpackages.
 * <p>
 * Another annotation is @EnableAutoConfiguration which tells Spring Boot to run
 * autoconfiguration.
 * <p>
 * It also extends SpringBootServletInitializer which will configure Spring
 * servlet for us, and overrides the configure() method to point to itself, so
 * Spring can find the main configuration.
 * <p>
 * Finally, the main() method consists of single static call to
 * SpringApplication.run().
 * <p>
 * Methods annotated with @Bean are Java beans that are
 * container-managed, i.e. managed by Spring. Whenever there are @Autowire, @Inject
 * or similar annotations found in the code (which is being scanned through the @ComponentScan
 * annotation), the container then knows how to create those beans and inject
 * them accordingly.
 */
@SpringBootApplication
//@Import(CassandraConfig.class) // either define the context to be imported, or see ComponentScan comment below
@ComponentScan(basePackages = {
      "ch.psi.daq.rest", 
      "ch.psi.daq.cassandra.config", // define the package name with the CassandraConfig configuration, or @Import it (see above) 
      "ch.psi.daq.cassandra.reader", 
      "ch.psi.daq.cassandra.writer" 
})
public class DaqRestApplication extends SpringBootServletInitializer {

   
    public static void main(final String[] args) {
        SpringApplication.run(DaqRestApplication.class, args);
    }

    @Override
    protected final SpringApplicationBuilder configure(final SpringApplicationBuilder application) {
        return application.sources(DaqRestApplication.class);
    }
    
    // a nested configuration
    // this guarantees that the ordering of the properties file is as expected
    // see: https://jira.spring.io/browse/SPR-10409?focusedCommentId=101393&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-101393
//    @Configuration
//    @Import(CassandraConfig.class)
//    static class InnerConfiguration { }
}