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package net.sourceforge.plantuml.regex;

import java.util.concurrent.atomic.AtomicLong;

import net.sourceforge.plantuml.text.StringLocated;

public final class RegexConcat extends RegexComposed implements IRegex {

	private final AtomicLong foxRegex = new AtomicLong(-1L);
	private int limitSize;

	// private static final Set PRINTED2 = new HashSet<>();

	public static void printCacheInfo() {
//		if (OptionFlags.getInstance().isVerbose())
//			synchronized (cache) {
//
//				final NumberFormat nf = NumberFormat.getInstance(Locale.US);
//
//				int nbCompiled = 0;
//				int nbInvoked = 0;
//				for (RegexConcat reg : cache.values()) {
//					if (reg.isCompiled())
//						nbCompiled++;
//
//					if (reg.invoked())
//						nbInvoked++;
//
//				}
//				Log.info("Regex total/invoked/compiled " + nf.format(cache.size()) + "/" + nf.format(nbInvoked) + "/"
//						+ nf.format(nbCompiled));
//				Log.info("Matches escaped " + nf.format(vescaped.get()) + "/" + nf.format(vtot.get()));
//				Log.info("Matches created " + nf.format(nbCreateMatches.get()));
//			}
	}

	public RegexConcat(IRegex... partials) {
		super(partials);
	}

	private long foxRegex() {
		final long result = foxRegex.get();
		if (result == -1L) {
			long tmp = 0L;
			for (int i = 1; i < partials().size() - 1; i++) {
				final IRegex part = partials().get(i);
				if (part instanceof RegexLeaf) {
					final RegexLeaf leaf = (RegexLeaf) part;
					tmp = tmp | leaf.getFoxSignature();
				}
			}
			foxRegex.set(tmp);
			return tmp;
		}
		return result;
	}

	public static RegexConcat build(String key, IRegex... partials) {
		return buildInternal(partials);
//		RegexConcat result = cache.get(key);
//		if (result == null) {
//			cache.putIfAbsent(key, buildInternal(partials));
//			result = cache.get(key);
//			// System.err.println("cache size=" + cache.size());
//			// } else {
//			// synchronized (PRINTED2) {
//			// if (PRINTED2.contains(key) == false) {
//			// System.err.println("if (key.equals(\"" + key + "\")) return
//			// buildInternal(partials);");
//			// }
//			// PRINTED2.add(key);
//		}
//		return result;
	}

	private static RegexConcat buildInternal(IRegex... partials) {
		final RegexConcat result = new RegexConcat(partials);
		assert partials[0] == RegexLeaf.start();
		assert partials[partials.length - 1] == RegexLeaf.end();
		return result;
	}

	private boolean invoked() {
		return foxRegex.get() != -1L;
	}

//	static private final Set PRINTED = new HashSet<>();
//	static private final Set ZERO = new HashSet<>();

	@Override
	public boolean match(StringLocated s) {
		if (limitSize != 0 && s.getString().length() > limitSize)
			return false;

		// vtot.incrementAndGet();
		final long foxRegex = foxRegex();
//		synchronized (PRINTED) {
//			final String full = getFullSlow();
//			final boolean added = PRINTED.add(full);
//			if (added && foxRegex == 0L) {
//				ZERO.add(full);
//				System.err.println("PR " + ZERO.size() + "/" + PRINTED.size() + " "
//						+ FoxSignature.backToString(foxRegex) + " " + full);
//			}
//		}
		if (foxRegex != 0L) {
			final long foxLine = s.getFoxSignature();
			final long check = foxRegex & foxLine;
			// System.err.println("r=" + getFullSlow() + " s=" + s + " line=" + foxLine + "
			// regex" + foxRegex + " "
			// + check + " <" + FoxSignature.backToString(check) + ">");
			if (check != foxRegex) {
				// vescaped.incrementAndGet();
				return false;
			}

		}
		return super.match(s);
	}

	@Override
	protected String getFullSlow() {
		final StringBuilder sb = new StringBuilder();
		for (IRegex p : partials())
			sb.append(p.getPattern());

		return sb.toString();
	}

	public RegexConcat protectSize(int size) {
		limitSize = size;
		return this;
	}

}