package eu.dnetlib.data.collector.plugins.ftp;

import java.util.Iterator;
import java.util.Set;

import com.google.common.base.Splitter;
import com.google.common.collect.Sets;
import eu.dnetlib.data.collector.plugin.AbstractCollectorPlugin;
import eu.dnetlib.data.collector.rmi.CollectorServiceException;
import eu.dnetlib.data.collector.rmi.InterfaceDescriptor;
import org.springframework.beans.factory.annotation.Required;

/**
 *
 * @author Author: Andrea Mannocci
 *
 */
public class FtpCollectorPlugin extends AbstractCollectorPlugin {

	private FtpIteratorFactory ftpIteratorFactory;

	@Override
	public Iterable<String> collect(final InterfaceDescriptor interfaceDescriptor, final String fromDate, final String untilDate)
			throws CollectorServiceException {

		final String baseUrl = interfaceDescriptor.getBaseUrl();
		final String username = interfaceDescriptor.getParams().get("username");
		final String password = interfaceDescriptor.getParams().get("password");
		final String recursive = interfaceDescriptor.getParams().get("recursive");
		final String extensions = interfaceDescriptor.getParams().get("extensions");

		if ((baseUrl == null) || baseUrl.isEmpty()) { throw new CollectorServiceException("Param 'baseurl' is null or empty"); }
		if ((username == null) || username.isEmpty()) { throw new CollectorServiceException("Param 'username' is null or empty"); }
		if ((password == null) || password.isEmpty()) { throw new CollectorServiceException("Param 'password' is null or empty"); }
		if ((recursive == null) || recursive.isEmpty()) { throw new CollectorServiceException("Param 'recursive' is null or empty"); }
		if ((extensions == null) || extensions.isEmpty()) { throw new CollectorServiceException("Param 'extensions' is null or empty"); }

		if (fromDate != null && !fromDate.matches("\\d{4}-\\d{2}-\\d{2}")) { throw new CollectorServiceException("Invalid date (YYYY-MM-DD): " + fromDate); }

		return new Iterable<String>() {

			boolean isRecursive = "true".equals(recursive);

			Set<String> extensionsSet = parseSet(extensions);

			@Override
			public Iterator<String> iterator() {
				return getFtpIteratorFactory().newIterator(baseUrl, username, password, isRecursive, extensionsSet, fromDate);
			}

			private Set<String> parseSet(final String extensions) {
				return Sets.newHashSet(Splitter.on(",").omitEmptyStrings().trimResults().split(extensions));
			}
		};
	}

	public FtpIteratorFactory getFtpIteratorFactory() {
		return ftpIteratorFactory;
	}

	@Required
	public void setFtpIteratorFactory(final FtpIteratorFactory ftpIteratorFactory) {
		this.ftpIteratorFactory = ftpIteratorFactory;
	}

}