Slimefun4/src/me/mrCookieSlime/Slimefun/commands/SlimefunTabCompleter.java

package me.mrCookieSlime.Slimefun.commands;

import java.util.ArrayList;
import java.util.List;

import me.mrCookieSlime.Slimefun.Objects.Research;
import me.mrCookieSlime.Slimefun.api.Slimefun;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabCompleter;

public class SlimefunTabCompleter implements TabCompleter {
	
	private final SlimefunCommand command;
	
	public SlimefunTabCompleter(SlimefunCommand command) {
		this.command = command;
	}

	@Override
	public List<String> onTabComplete(CommandSender sender, Command cmd, String label, String[] args) {
		if (args.length == 1) {
			return createReturnList(command.getTabArguments(), args[0]);
		}
		else if (args.length == 3) {
			if (args[0].equalsIgnoreCase("give")) {
				return createReturnList(Slimefun.listIDs(), args[2]);
			}
			else if (args[0].equalsIgnoreCase("research")) {
				List<String> researches = new ArrayList<>();
				for (Research res : Research.list()) {
					researches.add(res.getName().toUpperCase().replace(" ", "_"));
				}
				researches.add("all");
				researches.add("reset");
				return createReturnList(researches, args[2]);
			}
			else {
				return null;
			}
		}
		else {
			return null;
		}
	}

	/***
	 * Returns a sublist from a given list containing items that start with the given string if string is not empty
	 * @param list The list to process
	 * @param string The typed string
	 * @return Sublist if string is not empty
	 */
	private List<String> createReturnList(List<String> list, String string) {
		if (string.equals("")) return list;

		List<String> returnList = new ArrayList<>();
		for (String item : list) {
			if (item.toLowerCase().startsWith(string.toLowerCase())) {
				returnList.add(item);
			}
		}
		return returnList;
	}

}