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/*
 * Copyright 2007 Future Earth, [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package eu.future.earth.gwt.client;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.TextBox;

import eu.future.earth.gwt.client.ui.events.enter.HasKeyEnterEventHandlers;
import eu.future.earth.gwt.client.ui.events.enter.KeyEnterEvent;
import eu.future.earth.gwt.client.ui.events.enter.KeyEnterHandler;

public class TimeBox extends TextBox implements HasKeyEnterEventHandlers {

	public final static String DEFAULT_TIME_FORMAT = "HH:mm";

	private String format = DEFAULT_TIME_FORMAT;

	private DateTimeFormat date = null;

	public TimeBox() {
		this(DEFAULT_TIME_FORMAT);
	}

	public TimeBox(String format) {
		super.sinkEvents(Event.ONKEYDOWN);
		setFormat(format);
		addStyleName("ftr-time-box");
	}

	public void onBrowserEvent(Event event) {
		int eventType = DOM.eventGetType(event);
		int keyCode = event.getKeyCode();

		switch (eventType) {
		case Event.ONKEYDOWN: {
			if (KeyEnterEvent.isValidKeyCode(keyCode)) {
				KeyEnterEvent.fire(this);
			} else {

				if (keyCode == 37 || keyCode == 39 || keyCode == 18 || keyCode == 9) {
					super.onBrowserEvent(event);
					return;
				} else {
					if (isTimeKey(keyCode)) {
						final int cursor = super.getCursorPos();
						if (cursor >= format.length()) {

						} else {
							final String temp = super.getText();
							final char rep = format.charAt(cursor);
							if (rep == ':') {
								super.setCursorPos(cursor + 1);
							} else {
								char next = (char) -1;
								if (format.length() > cursor + 1) {
									next = format.charAt(cursor + 1);
								}
								char newChar = ((char) convert(keyCode));
								boolean allow = false;
								if (rep == 'H' && next == 'H') {
									if (newChar == '0' || newChar == '1' || newChar == '2') {
										allow = true;
									}
								} else {
									if (rep == 'H') {
										char prev = temp.charAt(cursor - 1);
										if (prev == '2') {
											if (newChar == '0' || newChar == '1' || newChar == '2' || newChar == '3') {
												allow = true;
											}
										} else {
											allow = true;
										}

									}
								}

								if (rep == 'h' && next == 'h') {
									if (newChar == '0' || newChar == '1') {
										allow = true;
									}
								} else {
									if (rep == 'h') {
										char prev = temp.charAt(cursor - 1);
										if (prev == '1') {
											if (newChar == '0' || newChar == '1' || newChar == '2') {
												allow = true;
											}
										} else {
											allow = true;
										}

									}
								}

								if (rep == 'm' && next == 'm') {
									if (newChar == '0' || newChar == '1' || newChar == '2' || newChar == '3' || newChar == '4' || newChar == '5') {
										allow = true;
									}
								} else {
									if (rep == 'm') {
										final char prev = temp.charAt(cursor - 1);
										if (prev == '0' || prev == '1' || prev == '2' || prev == '3' || prev == '4' || prev == '5') {
											allow = true;
										} else {
											if (newChar == '0') {
												allow = true;
											}
										}
									}
								}

								if (rep == 'a' && next == 'a') {
									if (newChar == 'A' || newChar == 'a') {
										newChar = 'A';
										allow = true;
									} else if (newChar == 'P' || newChar == 'p') {
										newChar = 'P';
										allow = true;
									}

								} else {
									if (rep == 'a') {
										if (newChar == 'M' || newChar == 'm') {
											newChar = 'M';
											allow = true;
										}
									}
								}

								if (allow) {
									final String newString = temp.substring(0, cursor) + newChar + temp.substring(cursor + 1, format.length());
									super.setText(newString);
									if (next == ':') {
										super.setCursorPos(cursor + 2);
									} else {
										super.setCursorPos(cursor + 1);
									}

								}

							}
						}
						event.preventDefault();
						return;

					} else {
						event.preventDefault();
						return;
					}

				}
			}

		}
		default:
			super.onBrowserEvent(event);
		}
	}

	private int convert(int keyCode) {
		// convert 0 - 9 keys on number pad down into normal 0 - 9 range
		if (keyCode >= 96 && keyCode <= 105) {
			return keyCode - 48;
		}
		return keyCode;
	}

	@Override
	public HandlerRegistration addKeyEnterHandler(KeyEnterHandler handler) {
		return super.addHandler(handler, KeyEnterEvent.getType());
	}

	private boolean isTimeKey(int keyCode) {
		// 0 - 9 keys above qwerty
		if (keyCode >= 48 && keyCode <= 57) {
			return true;
		}
		// 0 - 9 keys on number pad
		if (keyCode >= 96 && keyCode <= 105) {
			return true;
		}
		// A, M, P keys
		if (keyCode == 65 || keyCode == 77 || keyCode == 80) {
			return true;
		}
		return false;
	}

	public void setDate(Date newValue) {
		if (newValue != null) {
			super.setText(date.format(newValue));
		} else {
			super.setText(format);
		}
	}

	public Date getValue(Date date) {
		if (getText() != null && getText().length() == format.length()) {
			if (getText().equals(format)) {
				return null;
			}
			try {
				final Date time = DateTimeFormat.getFormat(format).parse(getText());
				final GregorianCalendar thelper = new GregorianCalendar();
				thelper.setTime(time);
				final GregorianCalendar helper = new GregorianCalendar();
				helper.setTime(date);
				helper.set(Calendar.HOUR_OF_DAY, thelper.get(Calendar.HOUR_OF_DAY));
				helper.set(Calendar.MINUTE, thelper.get(Calendar.MINUTE));
				helper.set(Calendar.SECOND, 0);
				helper.set(Calendar.MILLISECOND, 0);
				return helper.getTime();
			} catch (Exception ex) {
				return null;
			}
		}
		return null;
	}

	public String getFormat() {
		return format;
	}

	public void setFormat(String format) {
		this.format = format;
		date = DateTimeFormat.getFormat(format);
		super.setText(format);
		super.setMaxLength(format.length());
		super.setVisibleLength(format.length());

	}
}




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