package org.simantics.plant3d.dialog;

import org.eclipse.jface.viewers.LabelProvider;
import org.simantics.plant3d.utils.Item;

public class ComponentLabelProvider extends LabelProvider{
	
	@Override
	public String getText(Object element) {
		Item item = (Item)element;
		String label = item.getLabel();
		return label != null ? label : fromCamelCase(item.getName());
	}

	private static String fromCamelCase(String name) {
		StringBuilder b = new StringBuilder(name);
		for (int i = 0; i < b.length(); i++) {
			char ch = b.charAt(i);
			if (i == 0 && Character.isLowerCase(ch)) {
				b.setCharAt(i, Character.toUpperCase(ch));
			}
			else if (ch == '_') {
				if (i == 0 || b.charAt(i-1) == ' ') {
					b.deleteCharAt(i);
					i--;
				}
				else {
					b.setCharAt(i, ' ');
				}
			}
			else if (i >= 2 && Character.isLowerCase(ch) &&
					Character.isUpperCase(b.charAt(i-1)) &&
					b.charAt(i-2) != ' ') {
				b.insert(i-1, ' ');
				i++;
			}
		}
		
		return b.toString();
	}
}