/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.internal.batchimport.cache.idmapping.string;

import static org.junit.jupiter.api.Assertions.assertTrue;

import org.eclipse.collections.api.set.primitive.MutableLongSet;
import org.eclipse.collections.impl.set.mutable.primitive.LongHashSet;
import org.junit.jupiter.api.Test;

class StringEncoderTest {
    @Test
    void shouldEncodeStringWithZeroLength() {
        // GIVEN
        Encoder encoder = new StringEncoder();

        // WHEN
        long eId = encoder.encode("");

        // THEN
        assertTrue(eId != 0);
    }

    @Test
    void shouldEncodeStringWithAnyLength() {
        // GIVEN
        Encoder encoder = new StringEncoder();

        // WHEN
        MutableLongSet encoded = new LongHashSet();
        int total = 1_000;
        int duplicates = 0;
        for (int i = 0; i < total; i++) {
            // THEN
            long encode = encoder.encode(abcStringOfLength(i));
            assertTrue(encode != 0);
            if (!encoded.add(encode)) {
                duplicates++;
            }
        }
        assertTrue(((float) duplicates / (float) total) < 0.01f);
    }

    private static String abcStringOfLength(int length) {
        char[] chars = new char[length];
        for (int i = 0; i < length; i++) {
            int ch = 'a' + (i % 20);
            chars[i] = (char) ch;
        }
        return new String(chars);
    }
}
