package net.cbaines.suca;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URISyntaxException;
import java.text.ParseException;
import java.util.Arrays;
import java.util.Calendar;
import java.util.GregorianCalendar;

import net.fortuna.ical4j.data.CalendarParser;
import net.fortuna.ical4j.data.ContentHandler;
import net.fortuna.ical4j.data.ParserException;
import net.fortuna.ical4j.model.Component;
import net.fortuna.ical4j.model.DateTime;
import net.fortuna.ical4j.model.Property;

public class SotonCalendarParser implements CalendarParser {
	private final static String TAG = "SotonCalendarParser";

	/**
	 * Start dates for the Autumn term's for each Academic Year starting from
	 * 2011 to
	 */
	// private static final GregorianCalendar[] startOfAutumnTerm = {new
	// GregorianCalendar(2011, Calendar.SEPTEMBER, 19),new
	// GregorianCalendar(2011, Calendar.SEPTEMBER, 19)

	private Calendar startOfYear = new GregorianCalendar(2011,
			Calendar.SEPTEMBER, 19);

	public void parse(InputStream in, ContentHandler handler)
			throws IOException, ParserException {
		parse(new InputStreamReader(in), handler);
	}

	public void parse(Reader in, ContentHandler handler) throws IOException,
			ParserException {
		parse(new BufferedReader(in, 3), handler);
	}

	public void parse(BufferedReader in, ContentHandler handler)
			throws IOException, ParserException {

		try {
			handler.startCalendar();
			handler.startProperty(Property.NAME);
			handler.propertyValue("2.0");
			handler.endProperty(Property.NAME);
			handler.startProperty(Property.PRODID);
			handler.propertyValue("-//Chris Baines + Henco Appel//SouthamptonUniversityOrganiser//EN");
			handler.endProperty(Property.NAME);
			String line;
			while ((line = in.readLine()) != null) {
				if (!line.trim().equals("")) {
					System.out.println("Line: " + line);
					String[] lecture = line.split("\",\"");
					// Remove the starting " off of the date
					lecture[0] = lecture[0].substring(1,
							lecture[0].length() - 1);
					// Remove the trailing " off of the weeks
					lecture[6] = lecture[6].substring(0,
							lecture[0].length() - 1);
					String[] people = lecture[4].split(",");
					String[] weeks = lecture[6].split("[\\-,]");
					// System.out.println(Arrays.toString(lecture));
					for (int i = 0; i < weeks.length; i += 2) {
						int weeksStart = Integer.parseInt(weeks[i].trim());
						int weeksEnd = weeksStart;
						if (i + 1 < weeks.length) {
							weeksEnd = Integer.parseInt(weeks[i + 1].trim());
						}
						for (int week = weeksStart; week <= weeksEnd; week++) {
							// System.out.println(week +
							// Arrays.toString(lecture));
							createEvent(lecture, handler, week);
						}
					}

				}
			}
			handler.endCalendar();
		} catch (ParseException e) {
			e.printStackTrace();
		} catch (URISyntaxException e) {
			e.printStackTrace();
		} catch (NumberFormatException e) {
			e.printStackTrace();
		}
	}

	// void String getRecuranceRule(String weeks) {
	// StringBuilder rrule = new StringBuilder(50);
	// rrule.append("RRULE:FREQ=WEEKLY;");
	//
	// }

	private void createEvent(String[] lecture, ContentHandler handler, int week)
			throws ParseException, URISyntaxException, IOException,
			NumberFormatException {
		handler.startComponent(Component.VEVENT);
		handler.startProperty(Property.UID);
		handler.propertyValue("email");
		handler.endProperty(Property.UID);
		handler.startProperty(Property.DTSTAMP);
		handler.propertyValue(new DateTime(java.util.Calendar.getInstance()
				.getTime()).toString());
		handler.endProperty(Property.DTSTAMP);
		// handler.startProperty(Property.ORGANIZER);
		// handler.propertyValue("Organiser");
		// handler.endProperty(Property.ORGANIZER);
		Calendar time = (Calendar) startOfYear.clone();
		int day = 0;
		if (lecture[0].equals("Monday")) {
			day = 0;
		} else if (lecture[0].equals("Tuesday")) {
			day = 1;
		} else if (lecture[0].equals("Wednesday")) {
			day = 2;
		} else if (lecture[0].equals("Thursday")) {
			day = 3;
		} else if (lecture[0].equals("Friday")) {
			day = 4;
		} else {
			throw new ParseException(Arrays.toString(lecture), 0);
		}
		time.add(Calendar.DAY_OF_MONTH, day);
		time.set(Calendar.HOUR_OF_DAY,
				Integer.parseInt(lecture[1].substring(0, 2)));
		time.add(Calendar.WEEK_OF_YEAR, week);
		handler.startProperty(Property.DTSTART);
		handler.propertyValue(new DateTime(time.getTime()).toString());
		handler.endProperty(Property.DTSTART);
		time.set(Calendar.HOUR_OF_DAY,
				Integer.parseInt(lecture[2].substring(0, 2)));
		handler.startProperty(Property.DTEND);
		handler.propertyValue(new DateTime(time.getTime()).toString());
		handler.endProperty(Property.DTEND);
		handler.startProperty(Property.LOCATION);
		handler.propertyValue(lecture[5]);
		handler.endProperty(Property.LOCATION);
		handler.startProperty(Property.SUMMARY);
		handler.propertyValue(lecture[3] + " with " + lecture[4] + " in "
				+ lecture[5]);
		handler.endProperty(Property.SUMMARY);
		handler.endComponent(Component.VEVENT);
	}
}