package org.cpsolver.studentsct;

import java.io.File;
import java.io.FileOutputStream;
import java.text.DecimalFormat;
import java.util.Collections;
import java.util.Comparator;


import org.cpsolver.coursett.Constants;
import org.cpsolver.ifs.assignment.Assignment;
import org.cpsolver.ifs.assignment.DefaultSingleAssignment;
import org.cpsolver.ifs.util.DataProperties;
import org.cpsolver.ifs.util.ToolBox;
import org.cpsolver.studentsct.model.Course;
import org.cpsolver.studentsct.model.CourseRequest;
import org.cpsolver.studentsct.model.Enrollment;
import org.cpsolver.studentsct.model.FreeTimeRequest;
import org.cpsolver.studentsct.model.Request;
import org.cpsolver.studentsct.model.Request.RequestPriority;
import org.cpsolver.studentsct.model.Section;
import org.cpsolver.studentsct.model.Student;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

/**
 * This class exports student course and free time requests in a format as
 * defined in this <a
 * href='http://www.unitime.org/interface/StudentSectioning.dtd'>Student
 * Sectioning DTD</a>. See this <a href=
 * 'http://www.unitime.org/interface/studentSectioningRequest.xml'>example</a>
 * file.
 * 
 * @version StudentSct 1.3 (Student Sectioning)<br>
 *          Copyright (C) 2007 - 2014 Tomas Muller<br>
 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
 * <br>
 *          This library is free software; you can redistribute it and/or modify
 *          it under the terms of the GNU Lesser General Public License as
 *          published by the Free Software Foundation; either version 3 of the
 *          License, or (at your option) any later version. <br>
 * <br>
 *          This library is distributed in the hope that it will be useful, but
 *          WITHOUT ANY WARRANTY; without even the implied warranty of
 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *          Lesser General Public License for more details. <br>
 * <br>
 *          You should have received a copy of the GNU Lesser General Public
 *          License along with this library; if not see <a href='http://www.gnu.org/licenses'>http://www.gnu.org/licenses</a>.
 * 
 */

public class StudentRequestXml {
    private static DecimalFormat s2zDF = new DecimalFormat("00");

    public static Document exportModel(Assignment<Request, Enrollment> assignment, StudentSectioningModel model) {
        Document document = DocumentHelper.createDocument();
        Element requestElement = document.addElement("request");
        requestElement.addAttribute("campus", model.getProperties().getProperty("Data.Initiative"));
        requestElement.addAttribute("year", model.getProperties().getProperty("Data.Year"));
        requestElement.addAttribute("term", model.getProperties().getProperty("Data.Term"));
        for (Student student : model.getStudents()) {
            Element studentElement = requestElement.addElement("student");
            studentElement.addAttribute("key", String.valueOf(student.getId()));
            Element courseRequestsElement = studentElement.addElement("updateCourseRequests");
            courseRequestsElement.addAttribute("commit", "true");
            Collections.sort(student.getRequests(), new Comparator<Request>() {
                @Override
                public int compare(Request r1, Request r2) {
                    if (r1.isAlternative() != r2.isAlternative()) {
                        return (r1.isAlternative() ? 1 : -1);
                    }
                    return Double.compare(r1.getPriority(), r2.getPriority());
                }
            });
            boolean hasSchedule = false;
            for (Request request : student.getRequests()) {
                if (assignment.getValue(request) != null)
                    hasSchedule = true;
                if (request instanceof FreeTimeRequest) {
                    FreeTimeRequest ftReq = (FreeTimeRequest) request;
                    Element ftReqElement = courseRequestsElement.addElement("freeTime");
                    requestElement.addAttribute("days", ftReq.getTime().getDayHeader());
                    int startSlot = ftReq.getTime().getStartSlot();
                    int startTime = startSlot * Constants.SLOT_LENGTH_MIN + Constants.FIRST_SLOT_TIME_MIN;
                    ftReqElement.addAttribute("startTime", s2zDF.format(startTime / 60) + s2zDF.format(startTime % 60));
                    int endTime = startTime + ftReq.getTime().getLength() * Constants.SLOT_LENGTH_MIN
                            - ftReq.getTime().getBreakTime();
                    ftReqElement.addAttribute("endTime", s2zDF.format(endTime / 60) + s2zDF.format(endTime % 60));
                    ftReqElement.addAttribute("length", String.valueOf(ftReq.getTime().getLength()
                            * Constants.SLOT_LENGTH_MIN));
                } else {
                    CourseRequest crReq = (CourseRequest) request;
                    Element crReqElement = courseRequestsElement.addElement("courseOffering");
                    Course course = crReq.getCourses().get(0);
                    crReqElement.addAttribute("subjectArea", course.getSubjectArea());
                    crReqElement.addAttribute("courseNumber", course.getCourseNumber());
                    crReqElement.addAttribute("waitlist", crReq.isWaitlist() ? "true" : "false");
                    crReqElement.addAttribute("critical", crReq.getRequestPriority() == RequestPriority.Critical ? "true" : "false");
                    crReqElement.addAttribute("importance", crReq.getRequestPriority().name());
                    crReqElement.addAttribute("alternative", crReq.isAlternative() ? "true" : "false");
                    for (int i = 1; i < crReq.getCourses().size(); i++) {
                        Course altCourse = crReq.getCourses().get(i);
                        Element altCourseElement = crReqElement.addElement("alternative");
                        altCourseElement.addAttribute("subjectArea", altCourse.getSubjectArea());
                        altCourseElement.addAttribute("courseNumber", altCourse.getCourseNumber());
                    }
                }
            }
            if (hasSchedule) {
                Element requestScheduleElement = studentElement.addElement("requestSchedule");
                requestScheduleElement.addAttribute("type", "commit");
                for (Request request : student.getRequests()) {
                    if (request instanceof CourseRequest) {
                        CourseRequest crReq = (CourseRequest) request;
                        Enrollment enrollment = assignment.getValue(crReq);
                        if (enrollment == null)
                            continue;
                        Element crReqElement = requestScheduleElement.addElement("courseOffering");
                        Course course = enrollment.getCourse();
                        crReqElement.addAttribute("subjectArea", course.getSubjectArea());
                        crReqElement.addAttribute("courseNumber", course.getCourseNumber());
                        for (Section section : enrollment.getSections()) {
                            Element classEl = crReqElement.addElement("class");
                            classEl.addAttribute("id", section.getSubpart().getInstructionalType());
                            classEl.addAttribute("assignmentId", String.valueOf(section.getId()));
                        }
                    }
                }
            }
        }
        return document;
    }

    public static void main(String[] args) {
        try {
            ToolBox.configureLogging();
            StudentSectioningModel model = new StudentSectioningModel(new DataProperties());
            Assignment<Request, Enrollment> assignment = new DefaultSingleAssignment<Request, Enrollment>();
            StudentSectioningXMLLoader xmlLoad = new StudentSectioningXMLLoader(model, assignment);
            xmlLoad.setInputFile(new File(args[0]));
            xmlLoad.load();
            Document document = exportModel(assignment, model);
            FileOutputStream fos = new FileOutputStream(new File(args[1]));
            (new XMLWriter(fos, OutputFormat.createPrettyPrint())).write(document);
            fos.flush();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
