package game.command;

import java.util.Map;

import game.collect.Maps;

public class EnumParser extends DefaultingParser {
	private final Map<String, Object> lookup = Maps.newHashMap();
	private final Object[] selections;
	
	private static <T> String joinArgs(T[] iter) {
		StringBuilder sb = new StringBuilder("'");
		for(T obj : iter) {
			if(sb.length() > 1)
				sb.append("', '");
			sb.append(String.valueOf(obj));
		}
		return sb.append("'").toString();
	}
	
	public EnumParser(String name, Object def, Object ... selections) {
		super(name, def, selections);
		this.selections = selections;
		for(Object o : selections) {
			this.lookup.put(o.toString().toLowerCase(), o);
		}
	}
	
	public Object parse(ScriptEnvironment env, String input) {
		Object value = this.lookup.get(input.toLowerCase());
		if(value != null)
			return value;
		int id = -1;
		try {
			id = Integer.parseInt(input);
		}
		catch(NumberFormatException e) {
		}
		if(id < 0 || id >= this.selections.length)
			throw new ScriptException("Ungültige Auswahl '%s', muss eine von diesen Optionen sein: %s", input, 
					joinArgs(this.selections));
		return this.selections[id];
	}
}