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package net.sourceforge.plantuml.tim;

import java.util.HashMap;
import java.util.Map;

public class TrieImpl implements Trie {

	private final Map brothers = new HashMap();

	public void add(String s) {
		if (s.indexOf('\0') != -1) {
			throw new IllegalArgumentException();
		}
		addInternal(this, s + "\0");
	}

	private static void addInternal(TrieImpl current, String s) {
		if (s.length() == 0) {
			throw new UnsupportedOperationException();
		}
		while (s.length() > 0) {
			final Character added = s.charAt(0);
			final TrieImpl child = current.getOrCreate(added);
			s = s.substring(1);
			current = child;
		}
	}

	public boolean remove(String s) {
		return removeInternal(this, s + "\0");
	}

	private static boolean removeInternal(TrieImpl current, String s) {
		if (s.length() <= 1) {
			throw new UnsupportedOperationException();
		}
		while (s.length() > 0) {
			final Character first = s.charAt(0);
			final TrieImpl child = current.brothers.get(first);
			if (child == null) {
				return false;
			}
			s = s.substring(1);
			if (s.length() == 1) {
				assert s.charAt(0) == '\0';
				return child.brothers.remove('\0') != null;
			}
			current = child;
		}
		throw new IllegalStateException();
	}

	private TrieImpl getOrCreate(Character added) {
		TrieImpl result = brothers.get(added);
		if (result == null) {
			result = new TrieImpl();
			brothers.put(added, result);
		}
		return result;
	}

	public String getLonguestMatchStartingIn(String s, int pos) {
		return getLonguestMatchStartingIn(this, s, pos);
	}

	private static String getLonguestMatchStartingIn(TrieImpl current, String s, int pos) {
		final StringBuilder result = new StringBuilder();
		while (current != null) {
			if (s.length() == pos) {
				if (current.brothers.containsKey('\0'))
					return result.toString();
				else
					return "";

			}
			final TrieImpl child = current.brothers.get(s.charAt(pos));
			if (child == null || child.brothers.size() == 0) {
				if (current.brothers.containsKey('\0'))
					return result.toString();
				else
					return "";

			}
			result.append(s.charAt(pos));
			current = child;
			pos++;
		}
		return "";

	}

}