package org.expeditee.gio.input;

import org.expeditee.core.Line;

public class KBMInputEvent extends InputEvent {
	
	public enum EventType {
		MOUSE_BUTTON_DOWN,
		MOUSE_BUTTON_UP,
		MOUSE_MOVE,
		MOUSE_WHEEL_SCROLL,
		KEY_DOWN,
		KEY_UP,
		CHAR_TYPED
	}
	
	/**
	 * Enumerates the mouse buttons of interest to Expeditee.
	 */
	public enum MouseButton {
		LEFT,
		MIDDLE,
		RIGHT
	}
	
	/**
	 * Enumerates the keyboard keys of interest to Expeditee.
	 */
	public enum Key {
		SHIFT,CTRL,ALT,
		ESC,
		F1,F2,F3,F4,F5,F6,F7,F8,F9,F10,F11,F12,
		UP_ARROW,DOWN_ARROW,LEFT_ARROW,RIGHT_ARROW,
		HOME,END,
		DELETE,
		PAGE_UP,PAGE_DOWN,
		BACKSPACE,
		TAB,
		ENTER,
		A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z
	}
	
	private EventType _eventType;
	private Object _eventData;
	
	public KBMInputEvent(EventType type, Object data) throws Exception
	{
		super(InputEvent.InputType.KBM);
		_eventType = type;
		_eventData = data;
		checkData();
	}
	
	public EventType getEventType()
	{
		return _eventType;
	}
	
	public Object getData()
	{
		return _eventData;
	}
	
	/** Gets the key that went down if this is a key-down event. */
	public Key getKeyDown()
	{
		if (_eventType == EventType.KEY_DOWN) return (Key) _eventData;
		
		return null;
	}
	
	/** Gets the key that went up if this is a key-up event. */
	public Key getKeyUp()
	{
		if (_eventType == EventType.KEY_UP) return (Key) _eventData;
		
		return null;
	}
	
	/**
	 * Gets the name of the key that was pressed/released.
	 * Returns the empty string if this is not a key event.
	 */
	public String getKeyText()
	{
		Key key = getKeyDown();
		if (key == null) key = getKeyUp();
		if (key == null) return "";
		return key.name();
	}
	
	/** Gets the character that was typed if this is a CHAR_TYPED event. */
	public Character getCharTyped()
	{
		if (_eventType == EventType.CHAR_TYPED) return (Character) _eventData;
		
		return null;
	}
	
	/** Gets the mouse button that went down if this is a mouse-button-down event. */
	public MouseButton getMouseButtonDown()
	{
		if (_eventType == EventType.MOUSE_BUTTON_DOWN) return (MouseButton) _eventData;
		
		return null;
	}
	
	/** Gets the mouse button that went up if this is a mouse-button-up event. */
	public MouseButton getMouseButtonUp()
	{
		if (_eventType == EventType.MOUSE_BUTTON_UP) return (MouseButton) _eventData;
		
		return null;
	}
	
	/** Gets the position of the mouse if this is a mouse-move event. */
	public Line getMouseMove()
	{
		if (_eventType == EventType.MOUSE_MOVE) return (Line) _eventData;
		
		return null;
	}
	
	private void checkData() throws Exception
	{
		if (_eventType == null) throw new Exception("No event type specified");
		if (_eventData == null) throw new Exception("No event data specified");
		
		switch (_eventType) {
		case MOUSE_BUTTON_DOWN:
		case MOUSE_BUTTON_UP:
			if (!(_eventData instanceof MouseButton)) throw new Exception("MouseButton data expected");
			break;
		case KEY_DOWN:
		case KEY_UP:
			if (!(_eventData instanceof Key)) throw new Exception("Key data expected");
			break;
		case CHAR_TYPED:
			if (!(_eventData instanceof Character)) throw new Exception("Character data expected");
			break;
		case MOUSE_MOVE:
			if (!(_eventData instanceof Line)) throw new Exception("Line data expected");
			break;
		case MOUSE_WHEEL_SCROLL:
			if (!(_eventData instanceof Integer)) throw new Exception("Integer data expected");
			break;
		}
	}

	@Override
	public String toString()
	{
		return _eventType.toString() + " event : Data = " + _eventData.toString();
	}
}