package pt.ist.renderers.servlets.functionalities;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.TypeElement;

import pt.ist.struts.dispatch.annotation.Mapping;

import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;

@SupportedSourceVersion(SourceVersion.RELEASE_6)
// cannot use ActiveObject.class.getName() the value must be a constant
// expression BLEAH!
@SupportedAnnotationTypes({ "pt.ist.fenixWebFramework.servlets.functionalities.CreateNodeAction" })
public class CreateNodeActionAnnotationProcessor extends AbstractProcessor {

    public static final String LOG_FILENAME = ".createNodeActionAnnotationLog";
    public static final String FIELD_SEPERATOR = " ";
    public static final String ENTRY_SEPERATOR = "\n";

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

	FileWriter fileWriter = null;
	try {
	    fileWriter = new FileWriter(LOG_FILENAME, true);

	    final Set<MethodSymbol> annotatedElements = (Set<MethodSymbol>) roundEnv
		    .getElementsAnnotatedWith(CreateNodeAction.class);

	    for (final MethodSymbol methodElement : annotatedElements) {
		final ClassSymbol classSymbol = (ClassSymbol) methodElement.getEnclosingElement();
		final String className = classSymbol.getQualifiedName().toString();

		final CreateNodeAction createNodeAction = methodElement.getAnnotation(CreateNodeAction.class);
		final String bundle = createNodeAction.bundle();
		final String key = createNodeAction.key();
		final String groupKey = createNodeAction.groupKey();

		final Mapping mapping = classSymbol.getAnnotation(Mapping.class);
		final String module = mapping.module();
		final String path = mapping.path();

		fileWriter.write(bundle);
		fileWriter.write(FIELD_SEPERATOR);
		fileWriter.write(groupKey);
		fileWriter.write(FIELD_SEPERATOR);
		fileWriter.write(key);
		fileWriter.write(FIELD_SEPERATOR);
		if (module != null && module.length() > 0) {
		    fileWriter.write("/");
		    fileWriter.write(module);
		}
		fileWriter.write(path);
		fileWriter.write(".do?method=");
		fileWriter.write(methodElement.getSimpleName().toString());
		fileWriter.write(ENTRY_SEPERATOR);
	    }
	} catch (IOException e) {
	    throw new Error(e);
	} finally {
	    if (fileWriter != null) {
		try {
		    fileWriter.close();
		} catch (IOException e) {
		    throw new Error(e);
		}
	    }
	}

	return true;
    }

}