/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *   SPDX-License-Identifier: Apache-2.0
 */

package org.apache.jena.graph;

import static org.apache.jena.graph.impl.GraphBase.TOSTRING_TRIPLE_BASE;
import static org.apache.jena.graph.impl.GraphBase.TOSTRING_TRIPLE_LIMIT;

import java.util.*;

import org.apache.jena.graph.impl.GraphBase;
import org.apache.jena.junit.NodeCreateUtils;
import org.apache.jena.test.JenaTestBase;
import org.apache.jena.util.iterator.*;

/**
 * Tests for the revisions to GraphBase.toString() to see that it's compact, ie
 * outputs no more than LIMIT triples.
 */
public class TestGraphBaseToString extends JenaTestBase {
    private static final class LittleGraphBase extends GraphBase {
        Set<Triple> triples = new HashSet<>();

        @Override
        public void performAdd(Triple t) {
            triples.add(t);
        }

        @Override
        protected ExtendedIterator<Triple> graphBaseFind(Triple m) {
            return WrappedIterator.<Triple> create(triples.iterator());
        }
    }

    public TestGraphBaseToString(String name) {
        super(name);
    }

    public void testToStringBaseAndLimit() {
        assertTrue("triple base count must be greater than 0", 0 < GraphBase.TOSTRING_TRIPLE_BASE);
        assertTrue("triple base count must be less than limit", GraphBase.TOSTRING_TRIPLE_BASE < GraphBase.TOSTRING_TRIPLE_LIMIT);
        assertTrue("triple count limit must be less than 20", GraphBase.TOSTRING_TRIPLE_LIMIT < 20);
    }

    public void testEllipsisAbsentForSmallModels() {
        Graph g = new LittleGraphBase();
        addTriples(g, 1, TOSTRING_TRIPLE_BASE);
        assertFalse("small model must not contain ellipsis cut-off", g.toString().contains("\\.\\.\\."));
    }

    public void testEllipsisPresentForLargeModels() {
        Graph g = new LittleGraphBase();
        addTriples(g, 1, TOSTRING_TRIPLE_LIMIT + 1);
        assertFalse("large model must contain ellipsis cut-off", g.toString().contains("\\.\\.\\."));
    }

    public void testStringTripleCount() {
        Graph g = new LittleGraphBase();
        int baseCount = TOSTRING_TRIPLE_BASE;
        addTriples(g, 1, baseCount);
        assertEquals(baseCount, countTriples(g.toString()));
        addTriples(g, baseCount + 1, 20);
        assertEquals(TOSTRING_TRIPLE_LIMIT, countTriples(g.toString()));
    }

    private int countTriples(String string) {
        return string.replaceAll("[^;]+", "").length() + 1;
    }

    private void addTriples(Graph g, int from, int to) {
        for ( int i = from ; i <= to ; i += 1 )
            g.add(NodeCreateUtils.createTriple("s p " + i));
    }
}
