Untitled

@Service
public class LectureParserImpl implements ILectureParser
{

    private static final Logger LOG = LoggerFactory.getLogger(LectureParserImpl.class);

    private static final String DATE_PATTERN = "dd.MM.yyyy";
    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern(DATE_PATTERN);

    public Lecture parseLectureDetails(String html)
    {
        Document document = Jsoup.parse(html);
        return Lecture.builder().studentCount(parseStudentCount(document))
            .itnStudentCount(parseItnStudentCount(document))
            .lectureName(parseElementText(document, "#ctl06_NazwaPrzedmiotyLabel"))
            .lectureCode(parseElementText(document, "#ctl06_KodPrzedmiotuLabel"))
            .lectureType(parseLectureType(document)).professor(parseElementText(document, "#ctl06_DydaktycyLabel"))
            .building(parseElementText(document, "#ctl06_BudynekLabel"))
            .classRoomNumber(parseElementText(document, "#ctl06_SalaLabel")).lectureDate(parseLectureDate(document))
            .startTime(parseElementText(document, "#ctl06_GodzRozpLabel"))
            .endTime(parseElementText(document, "#ctl06_GodzZakonLabel"))
            .duration(parseElementText(document, "#ctl06_CzasTrwaniaLabel")).build();
    }


    private int parseStudentCount(Document document)
    {
        try
        {
            String studentCountText = parseElementText(document, "#ctl06_LiczbaStudentowLabel");
            if (studentCountText.isEmpty())
            {
                return 0;
            }
            return Integer.parseInt(studentCountText.split(" ")[0]);
        }
        catch (Exception e)
        {
            LOG.error("Failed to parse student count:", e);
            return 0;
        }
    }

    private int parseItnStudentCount(Document document)
    {
        try
        {
            String studentCountText = parseElementText(document, "#ctl06_LiczbaStudentowLabel");
            String[] parts = studentCountText.split(" ");
            return parts.length > 2 && parts[2].equals("ITN") ? 1 : 0;
        }
        catch (Exception e)
        {
            LOG.error("Failed to parse ITN student count:", e);
            return 0;
        }
    }

    private LectureType parseLectureType(Document document)
    {
        try
        {
            String typeText = parseElementText(document, "#ctl06_TypZajecLabel");
            return LectureType.fromString(typeText);
        }
        catch (Exception e)
        {
            LOG.error("Failed to parse lecture type:", e);
            return LectureType.UNKNOWN;
        }
    }

    private Date parseLectureDate(Document document)
    {
        try
        {
            String dateText = parseElementText(document, "#ctl06_DataZajecLabel");
            LocalDate localDate = LocalDate.parse(dateText.trim(), DATE_FORMATTER);
            return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
        }
        catch (Exception e)
        {
            LOG.error("Failed to parse lecture date", e);
            return new Date();
        }
    }

    private String parseElementText(Document document, String cssSelector)
    {
        try
        {
            Element element = document.select(cssSelector).first();
            return element != null ? element.text().trim() : "";
        }
        catch (Exception e)
        {
            LOG.error("Failed to parse element text", e);
            return "";
        }
    }
}