#include "csv_exporter.h"

/*
 *
 * Class doc can be found in csv_exporter.h
 */
CSV_Exporter::CSV_Exporter()
{
    /* EMPTY - NO NEED */
}

/**
 * @brief   This method will generate the CSV file (Targeting google calendar import)
 *          it will create a full Semester calendar based on the users input (@param cal)
 *          and the @calSched wich holdes all the courses in "this" semester.
 * @param calSched  - Holdes all the Courses and there info
 * @param cal       - The Calendar dialog witch holdes the starting date and the eand date.
 * @return          - True if *all* went well, false if something on the way went wrong.
 */
bool CSV_Exporter::exportCalendar(calendarSchedule *calSched, CalendarDialog *cal, calendarExam *exams)
{
    if ((cal == NULL) || (calSched == NULL)) //pointers checking!
        return false;

    if (calSched->getCourses().isEmpty())
        return false;

    qDebug() << Q_FUNC_INFO << "Getting path for csv file from user...";

    QString filePath = getFileFath();
    if(filePath == NULL) //User canceled from the file explorer popup
    {
        qDebug() << Q_FUNC_INFO << "CSV : User pressed Cancel... returning false";
        return false;
    }
    qDebug() << Q_FUNC_INFO << "CSV : User Chose: " << filePath;
    qDebug() << Q_FUNC_INFO << "CSV : Atempting to export the Schedule...";

    QFile file(filePath);
    if(!file.open(QIODevice::ReadWrite | QIODevice::Truncate)) //Incase unable to open the file (binary mode - \n will not be converted on "Windows")
    {
        QMessageBox msgBox;
        msgBox.setIcon(QMessageBox::Critical);
        msgBox.setText(QObject::tr("Unable to open or create the file.\nExporting Failed"));
        msgBox.exec();
        qCritical() << Q_FUNC_INFO << "unable to open/create the file... maybe permissions error.";
        return false;
    }

    QTextStream out(&file); //The output streem.
    out.setCodec("UTF-8"); //Unicode 8

    out << CSV_CALENDAR_HEADER << "\n"; // macro in header file

    for (calendarCourse *coursePtr: (calSched->getCourses())) //main loop - running though all courses
    {
        // Getting course info - store in vars for easy access
        int day = coursePtr->getDay();
        int startH = coursePtr->getHourBegin();
        int startM = coursePtr->getMinutesBegin();
        int endH = coursePtr->getHourEnd();
        int endM = coursePtr->getMinutesEnd();
        QString lecturer = coursePtr->getLecturer();
        QString type = coursePtr->getType();
        QString name = coursePtr->getName();
        QString room = coursePtr->getRoom();

        QDate currentDate = cal->getStartDate(); // currentDate will iterate throuh the semester
        int firstDayOfSemester = currentDate.dayOfWeek(); //Returns the weekday (1 = Monday to 7 = Sunday) for this date.

        changeDayNumberFromQtToNormal(&firstDayOfSemester); //Get sync with our day numbers.

        /*
         * these 6 lines will get the right day for the starting poin in a
         * semester for eatch course.
         */
        if(day > firstDayOfSemester)
            currentDate = currentDate.addDays(day-firstDayOfSemester); //add the gap
        else if(day < firstDayOfSemester)
            currentDate = currentDate.addDays(6); //move a week nius one day
        else// ==
            currentDate = currentDate; //just for clearaty

        /*
         * secondary loop - We have course info and starting day.
         * evrey loop enterence we add the course and moving one week forward.
         */
        for(;currentDate <= cal->getEndDate(); currentDate = currentDate.addDays(7))
        {
            QString line = makeLine(name, &currentDate, startH, startM, endH, endM, lecturer, room, type);
            if(line != NULL)
                out << line << char(0x0A);
            else
                qWarning() << Q_FUNC_INFO << "CSV : Got A NULL in Line! in function: " << Q_FUNC_INFO;
        }
        out.flush();
    }

    if(cal->isExams()) //Export Exams as well
    {
        qDebug() << "Exporting Exams!";
        for(calendarExamCourse* exam:exams->getExams())
        {
            QTime startH = exam->getFirstHourbegin();
            QTime endH = startH.addSecs(60*60*3);//add 3 hours
            QString type = "מועד א";
            QString name = exam->getName();
            QDate date = exam->getFirstDate();
            QString line = makeLine(name, &date, startH.hour(), startH.minute(), endH.hour(), endH.minute(), "", "", type);
            if(line != NULL)
                out << line << char(0x0A);
            else
                qWarning() << Q_FUNC_INFO << "CSV : Got A NULL in Line! in function: " << Q_FUNC_INFO;
            //===============
            // Second Date
            //===============
            startH = exam->getSecondHourbegin();
            endH = startH.addSecs(60*60*3);//add 3 hours
            date = exam->getSecondDate();
            type = "מועד ב";
            line = makeLine(name, &date, startH.hour(), startH.minute(), endH.hour(), endH.minute(), "", "", type);
            if(line != NULL)
                out << line << char(0x0A);
            else
                qWarning() << Q_FUNC_INFO << "CSV : Got A NULL in Line! in function: " << Q_FUNC_INFO;
        }
        out.flush();
    }

    file.close();
    qDebug() << Q_FUNC_INFO << "CSV : Exported Successfully";
    return true;

}

/**
 * @brief Get the file path according to user via a file explorer dialog
 * @return - QString: the file path.
 */
QString CSV_Exporter::getFileFath()
{
    QString fileName = QFileDialog::getSaveFileName(NULL,
                                                    QObject::tr("JceManager Save Schedule Dialog"), "",
                                                    QObject::tr("CSV Files (*.csv);;All Files (*)"));
    if (fileName == "")
        return NULL;

    //IMPORTENT! ADD CSV EXTENTION
    if(!fileName.contains(".csv") && !fileName.contains(".CSV"))
        fileName.append(".csv");
    return fileName;
}


/**
 * @brief Returning a CSV formated ling in QString.
 * @param name
 * @param date
 * @param startH
 * @param startM
 * @param endH
 * @param endM
 * @param lecturer
 * @param room
 * @param type
 * @return a CSV formated ling in QString.
 */
QString CSV_Exporter::makeLine(QString name, QDate *date, int startH, int startM, int endH, int endM, QString lecturer, QString room, QString type)
{
    //Creating a CSV text line for Google Calendar/iCal/Outlook

    QString CSV_line = "";
    QString subject = "\"";
    subject.append(name);
    subject.append(" - ");
    subject.append(type);
    subject.append("\"");


    QString dateStr = date->toString("MM/dd/yyyy");


    QString start;
    start.append(QString::number(startH));
    if(startM != 0)
    {
        start.append(":");
        start.append(QString::number(startM));
    }
    else
        start.append(":00");
    start.append(":00");

    QString end;
    end.append(QString::number(endH));
    if(endM != 0)
    {
        end.append(":");
        end.append(QString::number(endM));
    }
    else
        end.append(":00");
    end.append(":00");

    QString description = "\"מרצה ";

    if (lecturer == LECTURER_DEFAULT_STRING)
        description.append("טרם נקבע מרצה או מתרגל");
    else if(lecturer == "")
        description = "";
    else
        description.append(lecturer);

    description.append("\n");

    if (room == ROOM_DEFAULT_STRING)
        description.append("טרם נקבע מיקום");
    else
    {
        description.append(" ב");
        description.append(room);
    }

    if(room == "")
        description = "\"Good Luck!\n";

    description.append("\nCreated with JCE Manager.\"");

    //Create the Fucking Line
    //Header: Subject,Start Date,Start Time,End Date,End Time,Description,Location
    CSV_line.append(subject);
    CSV_line.append(",");

    CSV_line.append(dateStr);
    CSV_line.append(",");

    CSV_line.append(start);
    CSV_line.append(",");

    CSV_line.append(dateStr);
    CSV_line.append(",");

    CSV_line.append(end);
    CSV_line.append(",");

    CSV_line.append(description);
    CSV_line.append(",");

    CSV_line.append("\"JCE Jerusalem\"");

    return CSV_line;
}

/**
 * @brief The QDate.dayOfWeek() returns an integer as follows (Sunday = 7, monday = 1... Friday = 5)
 * This method will make that return integer more uderstandble and easy to use with the Calander classes of
 * JCE Manager. so Sunday = 1, Monday = 2 and so on...
 *
 * @param QtDay - A  Qt dayOfWeek integer pointer. it will cange his value.
 */
void CSV_Exporter::changeDayNumberFromQtToNormal(int *QtDay)
{
    switch(*QtDay){
    case 7:
        *QtDay = SUNDAY;
        break;
    case 1:
        *QtDay = MONDAY;
        break;
    case 2:
        *QtDay = TUESDAY;
        break;
    case 3:
        *QtDay = WENDSDAY;
        break;
    case 4:
        *QtDay = THURSDAY;
        break;
    case 5:
        *QtDay = FRIDAY;
        break;
    default:
        *QtDay = 7;
        break;
    }
    return; //Done.
}