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/*
 * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.rfc8819.model.api;

import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.Beta;
import com.google.common.collect.Interner;
import com.google.common.collect.Interners;
import java.util.regex.Pattern;
import org.eclipse.jdt.annotation.NonNull;

@Beta
public record Tag(@NonNull String value) {
    private static final Interner<@NonNull Tag> INTERNER = Interners.newWeakInterner();
    private static final Pattern TAG_VALUE_PATTERN = Pattern.compile("^["
            + "\\x20-\\uDFFF"
            + "\\uE000-\\uFDCF"
            + "\\uFDF0-\\uFFFD"
            + "\\x{10000}-\\x{1FFFD}"
            + "\\x{20000}-\\x{2FFFD}"
            + "\\x{30000}-\\x{3FFFD}"
            + "\\x{40000}-\\x{4FFFD}"
            + "\\x{50000}-\\x{5FFFD}"
            + "\\x{60000}-\\x{6FFFD}"
            + "\\x{70000}-\\x{7FFFD}"
            + "\\x{80000}-\\x{8FFFD}"
            + "\\x{90000}-\\x{9FFFD}"
            + "\\x{A0000}-\\x{AFFFD}"
            + "\\x{B0000}-\\x{BFFFD}"
            + "\\x{C0000}-\\x{CFFFD}"
            + "\\x{D0000}-\\x{DFFFD}"
            + "\\x{E0000}-\\x{EFFFD}"
            + "\\x{F0000}-\\x{FFFFD}"
            + "\\x{100000}-\\x{10FFFD}"
            + "]+$");

    public Tag {
        requireNonNull(value);
        checkArgument(isValidValue(value), "Invalid tag value '%s'.", value);
    }

    public boolean hasPrefix(final Prefix prefix) {
        return value.startsWith(prefix.value());
    }

    public @NonNull Tag intern() {
        return INTERNER.intern(this);
    }

    static boolean isValidValue(final String str) {
        return TAG_VALUE_PATTERN.matcher(str).matches();
    }
}