/*
 * Created on 27/Ago/2003
 */
package net.sourceforge.fenixedu.domain.onlineTests;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sourceforge.fenixedu.domain.RootDomainObject;
import net.sourceforge.fenixedu.domain.student.Registration;
import net.sourceforge.fenixedu.domain.student.Student;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.comparators.ComparatorChain;

/**
 * @author Susana Fernandes
 */
public class StudentTestQuestion extends StudentTestQuestion_Base {
    private static InheritableThreadLocal<Map<StudentTestQuestion, List<SubQuestion>>> studentSubQuestions = new InheritableThreadLocal<Map<StudentTestQuestion, List<SubQuestion>>>();

    public static final Comparator<StudentTestQuestion> COMPARATOR_BY_TEST_QUESTION_ORDER = new BeanComparator(
	    "testQuestionOrder");

    public static final Comparator<StudentTestQuestion> COMPARATOR_BY_STUDENT_NUMBER_AND_TEST_QUESTION_ORDER = new ComparatorChain();
    static {
	((ComparatorChain) COMPARATOR_BY_STUDENT_NUMBER_AND_TEST_QUESTION_ORDER).addComparator(new BeanComparator(
		"student.number"));
	((ComparatorChain) COMPARATOR_BY_STUDENT_NUMBER_AND_TEST_QUESTION_ORDER).addComparator(new BeanComparator(
		"testQuestionOrder"));
    }

    public StudentTestQuestion() {
	super();
	setRootDomainObject(RootDomainObject.getInstance());
    }

    public List<SubQuestion> getStudentSubQuestions() {
	if (studentSubQuestions.get() == null) {
	    studentSubQuestions.set(new HashMap<StudentTestQuestion, List<SubQuestion>>());
	}

	return studentSubQuestions.get().get(this);
    }

    public void setStudentSubQuestions(List<SubQuestion> studentSubQuestions) {
	getStudentSubQuestions();
	this.studentSubQuestions.get().put(this, studentSubQuestions);
    }

    public void addStudentSubQuestion(SubQuestion subQuestion) {
	if (getStudentSubQuestions() == null) {
	    setStudentSubQuestions(new ArrayList<SubQuestion>());
	}
	getStudentSubQuestions().add(subQuestion);
    }

    public SubQuestion getSubQuestionByItem() {
	if (getItemId() == null && !getStudentSubQuestions().isEmpty() && getStudentSubQuestions().size() == 1) {
	    return getStudentSubQuestions().iterator().next();
	}
	for (SubQuestion subQuestion : getStudentSubQuestions()) {
	    if (getItemId() != null && subQuestion.getItemId() != null) {
		if (getItemId().equals(subQuestion.getItemId())) {
		    return subQuestion;
		}
	    } else if (getItemId() == null && subQuestion.getItemId() == null) {
		return subQuestion;
	    }
	}
	return null;
    }

    public boolean isSubQuestion() {
	if (getItemId() != null && (!getQuestion().getSubQuestions().get(0).getItemId().equals(getItemId()))) {
	    return true;
	}
	return false;
    }

    public void delete() {
	removeDistributedTest();
	removeQuestion();
	removeStudent();
	removeRootDomainObject();
	super.deleteDomainObject();
    }

    public static boolean hasStudentTestQuestions(final Registration registration, final DistributedTest distributedTest) {
	Set<StudentTestQuestion> studentTestQuestions = findStudentTestQuestions(registration, distributedTest);
	return (studentTestQuestions == null || studentTestQuestions.size() == 0) ? false : true;
    }

    public static Set<StudentTestQuestion> findStudentTestQuestions(final Registration registration,
	    final DistributedTest distributedTest) {
	return findStudentTestQuestions(registration.getStudentTestsQuestionsSet(), distributedTest);
    }

    public static Set<StudentTestQuestion> findStudentTestQuestions(final Question question, final DistributedTest distributedTest) {
	return findStudentTestQuestions(question.getStudentTestsQuestionsSet(), distributedTest);
    }

    private static Set<StudentTestQuestion> findStudentTestQuestions(final Set<StudentTestQuestion> inputSet,
	    final DistributedTest distributedTest) {
	final Set<StudentTestQuestion> studentTestQuestions = new HashSet<StudentTestQuestion>();
	for (final StudentTestQuestion studentTestQuestion : inputSet) {
	    if (studentTestQuestion.getDistributedTest() == distributedTest) {
		studentTestQuestions.add(studentTestQuestion);
	    }
	}
	return studentTestQuestions;
    }

    public static StudentTestQuestion findStudentTestQuestion(final Question question, final Registration registration,
	    final DistributedTest distributedTest) {
	for (final StudentTestQuestion studentTestQuestion : question.getStudentTestsQuestionsSet()) {
	    if (distributedTest == studentTestQuestion.getDistributedTest() && registration == studentTestQuestion.getStudent()) {
		return studentTestQuestion;
	    }
	}
	return null;
    }

    public void setSubQuestionByItem(SubQuestion newSubQuestion) {
	if (getItemId() == null && !getStudentSubQuestions().isEmpty() && getStudentSubQuestions().size() == 1) {
	    getStudentSubQuestions().set(0, newSubQuestion);
	} else {
	    int i = 0;
	    for (; i < getStudentSubQuestions().size(); i++) {
		SubQuestion subQuestion = getStudentSubQuestions().get(i);
		if (getItemId() != null && subQuestion.getItemId() != null) {
		    if (getItemId().equals(subQuestion.getItemId())) {
			break;
		    }
		} else if (getItemId() == null && subQuestion.getItemId() == null) {
		    break;
		}
	    }
	    getStudentSubQuestions().set(i, newSubQuestion);
	}
    }
}