package org.crosswire.html;

import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.Date;
import java.util.Vector;
import java.text.SimpleDateFormat;

public class CalendarHTML {

	private Date curDate = null;
	private boolean week = false;
	private boolean month = false;

	public CalendarHTML() {
		this(new Date());
	}

	public CalendarHTML(Date curDate) {
		init(curDate, false, false);
	}

	private void init(Date curDate, boolean week, boolean month) {
		this.curDate = (curDate == null) ? new Date() : curDate;
		this.week = week;
		this.month = month;
	}

     public String getEventID(int year, int month, int day) {
		return String.valueOf(year + (month*100) + day);
	}

    public String getActiveDayHTML(String body, String baseURL, String eventID) {
        return "<ul><li><a href=\""+baseURL+"#"+eventID+"\">"+body+"</a></li></ul>";
    }

    public String getHeaderHTML(Date curMonth, String baseURL) {
        return "<center><h2>"+new SimpleDateFormat("MMMM yyyy").format(curMonth)+"</h2></center>";
    }

	public String getDayRowHTML(Date curMonth, String baseURL) {
        return "<tr class=\"caldays\"><td>S</td><td>M</td><td>T</td><td>W</td><td>T</td><td>F</td><td>S</td></tr>";
    }

	public String getMiniMonth(String baseURL) {
		Calendar cal = GregorianCalendar.getInstance();
		cal.setTime(curDate);
		Calendar today = GregorianCalendar.getInstance();
		today.setTime(new Date());
//		today.set(Calendar.HOUR_OF_DAY, 0);
//		today.set(Calendar.MINUTE, 0);
//		today.set(Calendar.SECOND, 0);
		Calendar weekStart = (Calendar) cal.clone();
		weekStart.set(Calendar.DAY_OF_MONTH, weekStart.get(Calendar.DAY_OF_MONTH) - (weekStart.get(Calendar.DAY_OF_WEEK)-1));
		weekStart.set(Calendar.HOUR_OF_DAY, 0);
		weekStart.set(Calendar.MINUTE, 0);
		weekStart.set(Calendar.SECOND, 0);
		Calendar weekEnd = (Calendar) weekStart.clone();
		weekEnd.set(Calendar.DAY_OF_MONTH, weekEnd.get(Calendar.DAY_OF_MONTH) + 7);
		weekEnd.set(Calendar.HOUR_OF_DAY, 23);
		weekEnd.set(Calendar.MINUTE, 59);
		weekEnd.set(Calendar.SECOND, 59);
		Date saveDate = curDate;

		StringBuffer buf = new StringBuffer();
		buf.append("<table cellpadding=\"0\" cellspacing=\"0\" border=\"0\">");
		buf.append("<tr class=\"caltop\" valign=\"middle\">");
		buf.append("<td colspan=\"1\">");
        buf.append(getHeaderHTML(cal.getTime(), baseURL));
		buf.append("</td></tr>");

		buf.append("<tr><td colspan=\"5\">");
		buf.append("<table width=\"100%\" cellpadding=\"1\" cellspacing=\"1\" border=\"0\"><tbody>");
        buf.append(getDayRowHTML(cal.getTime(), baseURL));

		cal.setTime(new Date());
		int now_monthday = cal.get(cal.DAY_OF_MONTH);
		int now_month = cal.get(cal.MONTH);
		cal.setTime(curDate);
		int cursel_monthday = cal.get(cal.DAY_OF_MONTH);
		int cursel_month = cal.get(cal.MONTH);
		cal.set(cal.DAY_OF_MONTH, 1);
		cal.set(cal.DAY_OF_MONTH, 2-cal.get(cal.DAY_OF_WEEK));
		for (int i = 0; i < 6; i++) {
			buf.append("<tr class=\"cal\">");
			for (int j = 0; j < 7; j++) {
//				boolean cursel = ((cal.get(cal.DAY_OF_MONTH) == cursel_monthday)
//					&& (cal.get(cal.MONTH) == cursel_month)
//					&& (!week) && (!month) && (j < 7));
                                String showID = getEventID(cal.get(cal.YEAR), cal.get(cal.MONTH), cal.get(cal.DAY_OF_MONTH));
                                boolean cursel = (showID != null);

				boolean otherMonth = (cal.get(cal.MONTH) != cursel_month);
				boolean now = ((cal.get(cal.DAY_OF_MONTH) == now_monthday) && (cal.get(cal.MONTH) == now_month));
				boolean prevDays = false; //cal.before(today);
				if (j == 7) {
					if (cal.before(weekEnd) && cal.after(weekStart) && (week)) {
						cursel = true;
					}
				}
				buf.append("<td class=\"cal");
				buf.append((otherMonth&&prevDays)?"othpre":(otherMonth)?"oth":(prevDays)?"pre":"");
//				buf.append((cursel)?"sel":(otherMonth&&prevDays)?"othpre":(otherMonth)?"oth":(now)?"tod":(prevDays)?"pre":"");
				buf.append("\">");

				if ((i > 0) && (j==7)) {	// if first week, then last day of week is good
							// buf if NOT first week, then we should select first day of week
					saveDate = cal.getTime();
					cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH) - (cal.get(Calendar.DAY_OF_WEEK)-1));
				}
				if ((i > 0) && (j==7)) {	// set back out current date
					cal.setTime(saveDate);
				}
				if (cursel)
					buf.append(getActiveDayHTML(String.valueOf(cal.get(cal.DAY_OF_MONTH)), baseURL, showID));
                else {
                    buf.append(cal.get(cal.DAY_OF_MONTH));
                }
				buf.append("</td>");

				cal.set(cal.DAY_OF_MONTH, cal.get(cal.DAY_OF_MONTH)+1);
			}
			buf.append("</tr>");
			if ((i == 4) && (cal.get(cal.DAY_OF_MONTH) < 20))	// if we've rolled over already, no need for a 6th week
				break;
		}
		buf.append("</tbody></table></td></tr>");
		buf.append("</table>");
		return buf.toString();
  }

	public static void main(String [] argv) {
		CalendarHTML self = new CalendarHTML(new Date());
		self.getMiniMonth("");
		Vector x = new Vector();
	}

}