package net.sourceforge.fenixedu.webServices.linkare;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Collection;
import java.util.Map;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.domain.DomainObject;

import com.linkare.commons.metainfo.Linkare;

import freemarker.template.Configuration;
import freemarker.template.Template;

@Linkare(author = "Paulo Zenida")
public abstract class ExportingData<T extends DomainObject> {

    private static final String FREEMARKER_TEMPLATES_DIRECTORY = "freemarker.templates.directory";

    private static Configuration configuration;

    static {
	configuration = new Configuration();
	try {
	    configuration.setDirectoryForTemplateLoading(new File(PropertiesManager.getProperty(FREEMARKER_TEMPLATES_DIRECTORY)));
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }

    protected static <T extends DomainObject> String process(final Map<String, Collection<T>> dataModel,
	    final String templateName, final String generatedFilename) {
	try {
	    return freemarkerDo(dataModel, templateName, generatedFilename);
	} catch (Exception e) {
	    e.printStackTrace();
	}
	return null;
    }

    // Process a template using FreeMarker and print the results
    private static <T extends DomainObject> String freemarkerDo(Map<String, Collection<T>> datamodel, final String templateName,
	    final String generatedFilename) throws Exception {
	Template tpl = configuration.getTemplate(templateName);
	OutputStreamWriter output = new OutputStreamWriter(new FileOutputStream(generatedFilename));
	tpl.process(datamodel, output);
	final FileReader in = new FileReader(generatedFilename);
	final BufferedReader buff = new BufferedReader(in);
	StringBuilder builder = new StringBuilder();
	String line = null;
	while ((line = buff.readLine()) != null) {
	    builder.append(line);
	}
	return builder.toString();
    }
}