package reflection.api;

import java.lang.reflect.Modifier;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ReflectionInvestigator implements Investigator {
  private Object subjectInstance;
  private Class<?> classInfo;

  public ReflectionInvestigator() {}

  @Override
  public void load(Object anInstanceOfSomething) {
    subjectInstance = anInstanceOfSomething;
    classInfo = subjectInstance.getClass();
  }

  @Override
  public int getTotalNumberOfMethods() {
    return classInfo.getDeclaredMethods().length;
  }

  @Override
  public int getTotalNumberOfConstructors() {
    return classInfo.getConstructors().length;
  }

  @Override
  public int getTotalNumberOfFields() {
    return classInfo.getFields().length;
  }

  @Override
  public Set<String> getAllImplementedInterfaces() {
    return Stream.of(classInfo.getInterfaces())
        .map(info -> info.getName())
        .collect(Collectors.toSet());
  }

  @Override
  public int getCountOfConstantFields() {
    return Stream.of(classInfo.getFields())
        .filter(f -> Modifier.isFinal(f.getModifiers()))
        .toArray()
        .length;
  }

  @Override
  public int getCountOfStaticMethods() {
    return Stream.of(classInfo.getMethods())
        .filter(m -> Modifier.isStatic(m.getModifiers()))
        .toArray()
        .length;
  }

  @Override
  public boolean isExtending() {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'isExtending'");
  }

  @Override
  public String getParentClassSimpleName() {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'getParentClassSimpleName'");
  }

  @Override
  public boolean isParentClassAbstract() {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'isParentClassAbstract'");
  }

  @Override
  public Set<String> getNamesOfAllFieldsIncludingInheritanceChain() {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException(
        "Unimplemented method 'getNamesOfAllFieldsIncludingInheritanceChain'");
  }

  @Override
  public int invokeMethodThatReturnsInt(String methodName, Object... args) {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'invokeMethodThatReturnsInt'");
  }

  @Override
  public Object createInstance(int numberOfArgs, Object... args) {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'createInstance'");
  }

  @Override
  public Object elevateMethodAndInvoke(String name, Class<?>[] parametersTypes, Object... args) {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'elevateMethodAndInvoke'");
  }

  @Override
  public String getInheritanceChain(String delimiter) {
    // TODO Auto-generated method stub
    throw new UnsupportedOperationException("Unimplemented method 'getInheritanceChain'");
  }
}