package br.com.tecsinapse.processors;

import static br.com.tecsinapse.processors.ProcessorConstants.INJECT;
import static br.com.tecsinapse.processors.ProcessorConstants.STATELESS;

import java.util.Set;

import javax.annotation.processing.Messager;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.QualifiedNameable;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.util.ElementFilter;
import javax.tools.Diagnostic.Kind;

@SupportedAnnotationTypes(STATELESS)
public class PossiblyBrokenStatelessProcessor extends BaseProcessor {
    private Messager messager;
    @Override
    protected void doProcess(Set<? extends TypeElement> annotations, 
          RoundEnvironment roundEnv) {
        messager = processingEnv.getMessager();
        annotations.forEach(annotation ->
              roundEnv.getElementsAnnotatedWith(annotation).forEach(element -> 
                    scanForMutableFields(element)
              )
        );
    }

    private void scanForMutableFields(Element element) {
        for (VariableElement field : ElementFilter.fieldsIn(element
              .getEnclosedElements())) {
            if (field.getModifiers().contains(Modifier.FINAL) || 
                  field.getModifiers().contains(Modifier.STATIC)) {
                continue;
            }
            
            if (!field.getAnnotationMirrors().stream().anyMatch(mirror -> 
                  ((QualifiedNameable)mirror.getAnnotationType().asElement())
                        .getQualifiedName().contentEquals(INJECT))) {
                messager.printMessage(Kind.WARNING, "Provável caso de @" 
                      + STATELESS + " incorreto", field);
            }
        }
    }
}