package net.sourceforge.fenixedu.dataTransferObject.student;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import net.sourceforge.fenixedu.domain.CurricularCourse;
import net.sourceforge.fenixedu.domain.DomainReference;
import net.sourceforge.fenixedu.domain.Enrolment;
import net.sourceforge.fenixedu.domain.ExecutionSemester;
import net.sourceforge.fenixedu.domain.StudentCurricularPlan;
import net.sourceforge.fenixedu.domain.curriculum.EnrollmentState;

public class ExecutionPeriodStatisticsBean implements Serializable {

    private DomainReference<ExecutionSemester> executionSemester;
    private List<Enrolment> enrolmentsWithinExecutionPeriod;
    private Integer totalEnrolmentsNumber;
    private Integer approvedEnrolmentsNumber;
    private Integer approvedRatio;
    private Double aritmeticAverage;

    public ExecutionPeriodStatisticsBean() {
	setExecutionPeriod(null);
	this.totalEnrolmentsNumber = 0;
	this.approvedEnrolmentsNumber = 0;
	this.approvedRatio = 0;
	this.aritmeticAverage = 0.0;
    }

    public ExecutionPeriodStatisticsBean(ExecutionSemester executionSemester) {
	setExecutionPeriod(executionSemester);
	this.enrolmentsWithinExecutionPeriod = new ArrayList<Enrolment>();
    }

    public ExecutionSemester getExecutionPeriod() {
	return (executionSemester == null ? null : executionSemester.getObject());
    }

    public void setExecutionPeriod(ExecutionSemester executionSemester) {
	this.executionSemester = new DomainReference<ExecutionSemester>(executionSemester);
    }

    public List<Enrolment> getEnrolmentsWithinExecutionPeriod() {
	return this.enrolmentsWithinExecutionPeriod;
    }

    public void setEnrolmentsWithinExecutionPeriod(List<Enrolment> enrolmentsWithinExecutionPeriod) {
	this.enrolmentsWithinExecutionPeriod = enrolmentsWithinExecutionPeriod;
    }

    public Integer getTotalEnrolmentsNumber() {
	return totalEnrolmentsNumber;
    }

    public void setTotalEnrolmentsNumber(Integer totalEnrolmentsNumber) {
	this.totalEnrolmentsNumber = totalEnrolmentsNumber;
    }

    public Integer getApprovedEnrolmentsNumber() {
	return approvedEnrolmentsNumber;
    }

    public void setApprovedEnrolmentsNumber(Integer approvedEnrolmentsNumber) {
	this.approvedEnrolmentsNumber = approvedEnrolmentsNumber;
    }

    public Integer getApprovedRatio() {
	return approvedRatio;
    }

    public void setApprovedRatio(Integer approvedRatio) {
	this.approvedRatio = approvedRatio;
    }

    public Double getAritmeticAverage() {
	return aritmeticAverage;
    }

    public void setAritmeticAverage(Double aritmeticAverage) {
	this.aritmeticAverage = aritmeticAverage;
    }

    private void calculateTotalEnrolmentsNumber() {
	setTotalEnrolmentsNumber(getEnrolmentsWithinExecutionPeriod().size());
    }

    private void calculateApprovedEnrolmentsNumber() {
	int approvedEnrolmentsNumber = 0;
	for (Enrolment enrolment : getEnrolmentsWithinExecutionPeriod()) {
	    if (enrolment.isApproved()) {
		approvedEnrolmentsNumber++;
	    }
	}
	setApprovedEnrolmentsNumber(approvedEnrolmentsNumber);
    }

    private void calculateAritmeticAverage() {
	int concludedCurricularCourses = 0, gradesAcumulator = 0;
	double aritmeticAverage = 0;

	for (Enrolment enrolment : getEnrolmentsWithinExecutionPeriod()) {
	    if (enrolment.isApproved() && enrolment.getFinalGrade() != null) {
		concludedCurricularCourses++;
		gradesAcumulator += enrolment.getFinalGrade();
	    }
	}
	aritmeticAverage = ((double) gradesAcumulator / (double) concludedCurricularCourses);
	setAritmeticAverage((int) (aritmeticAverage * 100) / 100.0);
    }

    private void calculateApprovedRatio() {
	int concludedEnrolments = 0;

	for (Enrolment enrolment : getEnrolmentsWithinExecutionPeriod()) {
	    if (enrolment.getEnrollmentState().equals(EnrollmentState.APROVED)) {
		concludedEnrolments++;
	    }
	}
	int ratio = Math.round(((float) concludedEnrolments / (float) getTotalEnrolmentsNumber()) * 100);
	setApprovedRatio(ratio);
    }

    public void addEnrolmentsWithinExecutionPeriod(List<Enrolment> enrolments) {
	// Checks if already exists enrolments for this execution period
	if (!this.enrolmentsWithinExecutionPeriod.isEmpty()) {
	    for (Enrolment newEnrolment : enrolments) {
		StudentCurricularPlan newEnrolmentSCP = newEnrolment.getStudentCurricularPlan();
		Enrolment previousAddedEnrolment = getPreviousEnrolmentGivenCurricularCourse(newEnrolment.getCurricularCourse());
		// Checks if exists a repeated enrolment
		if (previousAddedEnrolment != null) {
		    StudentCurricularPlan previousEnrolmentSCP = previousAddedEnrolment.getStudentCurricularPlan();
		    if (newEnrolmentSCP.getStartExecutionYear().isAfterOrEquals(previousEnrolmentSCP.getStartExecutionYear())) {
			this.enrolmentsWithinExecutionPeriod.remove(previousAddedEnrolment);
			this.enrolmentsWithinExecutionPeriod.add(newEnrolment);
		    }
		} else {
		    this.enrolmentsWithinExecutionPeriod.add(newEnrolment);
		}
	    }
	} else {
	    this.enrolmentsWithinExecutionPeriod = enrolments;
	}
	recalculateStatistics();
    }

    private Enrolment getPreviousEnrolmentGivenCurricularCourse(CurricularCourse curricular) {
	for (Enrolment enrolment : this.enrolmentsWithinExecutionPeriod) {
	    if (enrolment.getCurricularCourse().equals(curricular)) {
		return enrolment;
	    }
	}
	return null;
    }

    private void recalculateStatistics() {
	calculateTotalEnrolmentsNumber();
	calculateApprovedEnrolmentsNumber();
	calculateApprovedRatio();
	calculateAritmeticAverage();
    }

}