/*
 * 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
 *
 *     http://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.
 */

package org.apache.jena.rdfconnection;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.jena.atlas.iterator.Iter;
import org.apache.jena.atlas.junit.BaseTest;
import org.apache.jena.atlas.lib.StrUtils;
import org.apache.jena.query.Dataset;
import org.apache.jena.query.DatasetFactory;
import org.apache.jena.query.ReadWrite;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdfconnection.RDFConnection;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.sparql.core.DatasetGraph;
import org.apache.jena.sparql.sse.SSE;
import org.apache.jena.sparql.util.IsoMatcher;
import org.apache.jena.system.Txn;
import org.apache.jena.update.UpdateRequest;
import org.junit.Assume;
import org.junit.Test;

public abstract class AbstractTestRDFConnection extends BaseTest {
    // Testing data.
    static String DIR = "testing/RDFConnection/";
    
    protected abstract RDFConnection connection();
    // Not all connection types support abort.
    protected abstract boolean supportsAbort(); 

    // ---- Data
    static String dsgdata = StrUtils.strjoinNL
        ("(dataset"
        ,"  (graph (:s :p :o) (:s0 :p0 _:a))"
        ,"  (graph :g1 (:s :p :o) (:s1 :p1 :o1))"
        ,"  (graph :g2 (:s :p :o) (:s2 :p2 :o))"
        ,")"
        );
    
    static String dsgdata2 = StrUtils.strjoinNL
        ("(dataset"
        ,"  (graph (:x :y :z))"
        ,"  (graph :g9 (:s :p :o))"
        ,")"
        );

    
    static String graph1 = StrUtils.strjoinNL
        ("(graph (:s :p :o) (:s1 :p1 :o))"
        );

    static String graph2 = StrUtils.strjoinNL
        ("(graph (:s :p :o) (:s2 :p2 :o))"
        );
    
    static DatasetGraph dsg        = SSE.parseDatasetGraph(dsgdata);
    static Dataset      dataset    = DatasetFactory.wrap(dsg);
    static DatasetGraph dsg2       = SSE.parseDatasetGraph(dsgdata2);
    static Dataset      dataset2   = DatasetFactory.wrap(dsg2);

    static String       graphName  = "http://test/graph";
    static String       graphName2 = "http://test/graph2";
    static Model        model1     = ModelFactory.createModelForGraph(SSE.parseGraph(graph1));
    static Model        model2     = ModelFactory.createModelForGraph(SSE.parseGraph(graph2));
    // ---- Data

    @Test public void connect_01() {
        @SuppressWarnings("resource")
        RDFConnection conn = connection();
        assertFalse(conn.isClosed());
        conn.close();
        assertTrue(conn.isClosed());
        // Allow multiple close()
        conn.close();
    }
    
    @Test public void dataset_load_1() {
        String testDataFile = DIR+"data.trig"; 
        try ( RDFConnection conn = connection() ) {
            conn.loadDataset(testDataFile);
            Dataset ds0 = RDFDataMgr.loadDataset(testDataFile);
            Dataset ds = conn.fetchDataset();
            assertTrue("Datasets not isomorphic", isomorphic(ds0, ds));
        }
    }

    @Test public void dataset_put_1() {
        try ( RDFConnection conn = connection() ) {
            conn.putDataset(dataset); 
            Dataset ds1 = conn.fetchDataset();
            assertTrue("Datasets not isomorphic", isomorphic(dataset, ds1));
        }
    }

    @Test public void dataset_put_2() {
        try ( RDFConnection conn = connection() ) {
            conn.putDataset(dataset); 
            conn.putDataset(dataset2);
            Dataset ds1 = conn.fetchDataset();
            assertTrue("Datasets not isomorphic", isomorphic(dataset2, ds1));
        }
    }

    @Test public void dataset_post_1() {
        try ( RDFConnection conn = connection() ) {
            conn.loadDataset(dataset);
            Dataset ds1 = conn.fetchDataset();
            assertTrue("Datasets not isomorphic", isomorphic(dataset, ds1));
        }
    }
    
    @Test public void dataset_post_2() {
        try ( RDFConnection conn = connection() ) {
            conn.loadDataset(dataset);
            conn.loadDataset(dataset2);
            Dataset ds1 = conn.fetchDataset();
            long x = Iter.count(ds1.listNames());
            assertEquals("NG count", 3, x);
            assertFalse("Datasets are isomorphic", isomorphic(dataset, ds1));
            assertFalse("Datasets are isomorphic", isomorphic(dataset2, ds1));
        }
    }

    // Default graph
    
    @Test public void graph_load_1() {
        String testDataFile = DIR+"data.ttl"; 
        Model m0 = RDFDataMgr.loadModel(testDataFile);
        try ( RDFConnection conn = connection() ) {
            conn.load(testDataFile);
            Model m = conn.fetch();
            assertTrue("Models not isomorphic", isomorphic(m0, m));
        }
    }

    @Test public void graph_put_1() {
        try ( RDFConnection conn = connection() ) {
            conn.put(model1); 
            Dataset ds1 = conn.fetchDataset();
            Model m0 = conn.fetch();
            assertTrue("Models not isomorphic", isomorphic(model1, ds1.getDefaultModel()));
            Model m = conn.fetch();
            assertTrue("Models not isomorphic", isomorphic(model1, m));
        }
    }

    @Test public void graph_put_2() {
        try ( RDFConnection conn = connection() ) {
            conn.put(model1); 
            conn.put(model2);
            Model m = conn.fetch();
            assertTrue("Models not isomorphic", isomorphic(m, model2));
            assertFalse("Models not isomorphic", isomorphic(m, model1));
        }
    }

    @Test public void graph_post_1() {
        try ( RDFConnection conn = connection() ) {
            conn.load(model1);
            Model m = conn.fetch();
            assertTrue("Models not isomorphic", isomorphic(m, model1));
        }
    }
    
    @Test public void graph_post_2() {
        try ( RDFConnection conn = connection() ) {
            conn.load(model1);
            conn.load(model2);
            Model m = conn.fetch();
            Model m0 = ModelFactory.createUnion(model2, model1);
            assertTrue("Models are not isomorphic", isomorphic(m0, m));
        }
    }

    // DELETE
    
    // Named graphs
    
    @Test public void named_graph_load_1() {
        String testDataFile = DIR+"data.ttl"; 
        Model m0 = RDFDataMgr.loadModel(testDataFile);
        try ( RDFConnection conn = connection() ) {
            conn.load(graphName, testDataFile);
            Model m = conn.fetch(graphName);
            assertTrue("Models not isomorphic", isomorphic(m0, m));
            Model mDft = conn.fetch();
            assertTrue(mDft.isEmpty());
        }
    }

    @Test public void named_graph_put_1() {
        try ( RDFConnection conn = connection() ) {
            conn.put(graphName, model1); 
            Dataset ds1 = conn.fetchDataset();
            Model m0 = conn.fetch(graphName);
            assertTrue("Models not isomorphic", isomorphic(model1, ds1.getNamedModel(graphName)));
            Model m = conn.fetch(graphName);
            assertTrue("Models not isomorphic", isomorphic(model1, m));
        }
    }

    @Test public void named_graph_put_2() {
        try ( RDFConnection conn = connection() ) {
            conn.put(graphName, model1); 
            conn.put(graphName, model2);
            Model m = conn.fetch(graphName);
            assertTrue("Models not isomorphic", isomorphic(m, model2));
            assertFalse("Models not isomorphic", isomorphic(m, model1));
        }
    }

    @Test public void named_graph_put_2_different() {
        try ( RDFConnection conn = connection() ) {
            conn.put(graphName, model1); 
            conn.put(graphName2, model2);
            Model m1 = conn.fetch(graphName);
            Model m2 = conn.fetch(graphName2);
            assertTrue("Models not isomorphic", isomorphic(m1, model1));
            assertTrue("Models not isomorphic", isomorphic(m2, model2));
        }
    }

    @Test public void named_graph_post_1() {
        try ( RDFConnection conn = connection() ) {
            conn.load(graphName, model1);
            Model m = conn.fetch(graphName);
            assertTrue("Models not isomorphic", isomorphic(m, model1));
        }
    }
    
    @Test public void named_graph_post_2() {
        try ( RDFConnection conn = connection() ) {
            conn.load(graphName, model1);
            conn.load(graphName, model2);
            Model m = conn.fetch(graphName);
            Model m0 = ModelFactory.createUnion(model2, model1);
            assertTrue("Models are not isomorphic", isomorphic(m0, m));
        }
    }

    // DELETE
    
    // Remote connections don't support transactions fully.  
    //@Test public void transaction_01() 

    private static boolean isomorphic(Dataset ds1, Dataset ds2) {
        return IsoMatcher.isomorphic(ds1.asDatasetGraph(), ds2.asDatasetGraph());
    }
    
    private static boolean isomorphic(Model model1, Model model2) {
        return model1.isIsomorphicWith(model2);
    }
    

    @Test public void query_ask_01() {
        try ( RDFConnection conn = connection() ) {
            Txn.executeRead(conn, ()->{
                boolean b = conn.queryAsk("ASK{}");
                assertTrue(b);
            });
        }
    }

    @Test public void query_ask_02() {
        try ( RDFConnection conn = connection() ) {
            boolean b = conn.queryAsk("ASK{}");
            assertTrue(b);
        }
    }

    @Test public void query_select_01() {
        AtomicInteger counter = new AtomicInteger(0);
        try ( RDFConnection conn = connection() ) {
            Txn.executeWrite(conn, ()->conn.loadDataset(DIR+"data.trig"));
            Txn.executeRead(conn, ()->
                conn.querySelect("SELECT * { ?s ?p ?o }" , (r)->counter.incrementAndGet()));
            assertEquals(2, counter.get());
        }
    }

    @Test public void query_select_02() {
        AtomicInteger counter = new AtomicInteger(0);
        try ( RDFConnection conn = connection() ) {
            conn.loadDataset(DIR+"data.trig");
            conn.querySelect("SELECT * { ?s ?p ?o}" , (r)->counter.incrementAndGet());
            assertEquals(2, counter.get());
        }
    }

    @Test public void query_construct_01() {
        try ( RDFConnection conn = connection() ) {
            Txn.executeWrite(conn, ()->conn.loadDataset(DIR+"data.trig"));
            Txn.executeRead(conn, ()-> {
                Model m = conn.queryConstruct("CONSTRUCT WHERE { ?s ?p ?o }");
                assertEquals(2, m.size());
            });
        }
    }

    @Test public void query_construct_02() {
        try ( RDFConnection conn = connection() ) {
            conn.loadDataset(DIR+"data.trig");
            Model m = conn.queryConstruct("CONSTRUCT WHERE { ?s ?p ?o }");
            assertEquals(2, m.size());
        }
    }
    
    @Test public void update_01() {
        try ( RDFConnection conn = connection() ) {
            conn.update("INSERT DATA { <urn:x:s> <urn:x:p> <urn:x:o>}");
        }
    }

    @Test public void update_02() {
        try ( RDFConnection conn = connection() ) {
            Txn.executeWrite(conn, ()->conn.update("INSERT DATA { <urn:x:s> <urn:x:p> <urn:x:o>}"));
        }
    }

    @Test public void update_03() {
    	UpdateRequest update = new UpdateRequest();
    	update.add("INSERT DATA { <urn:x:s> <urn:x:p> <urn:x:o>}");
        try ( RDFConnection conn = connection() ) {
            conn.update(update);
        }
    }

    @Test public void update_04() {
    	UpdateRequest update = new UpdateRequest();
    	update.add("INSERT DATA { <urn:x:s> <urn:x:p> <urn:x:o>}");
        try ( RDFConnection conn = connection() ) {
            Txn.executeWrite(conn, ()->conn.update(update));
        }
    }
    // Not all Transactional support abort.
    @Test public void transaction_commit_read_01() {
        String testDataFile = DIR+"data.trig"; 
        try ( RDFConnection conn = connection() ) {

            conn.begin(ReadWrite.WRITE);
            conn.loadDataset(dataset);
            conn.commit();
            conn.end();
            
            conn.begin(ReadWrite.READ);
            Model m = conn.fetch();
            assertTrue(isomorphic(m, dataset.getDefaultModel()));
            conn.end();
        }
    }
    
    // Not all RDFConnections support abort.
    @Test public void transaction_abort_read02() {
        Assume.assumeTrue(supportsAbort());
        
        String testDataFile = DIR+"data.trig"; 
        try ( RDFConnection conn = connection() ) {
            conn.begin(ReadWrite.WRITE);
            conn.loadDataset(testDataFile);
            conn.abort();
            conn.end();
            
            conn.begin(ReadWrite.READ);
            Model m = conn.fetch();
            assertTrue(m.isEmpty());
            conn.end();
        }
    }

    //@Test(expected=JenaTransactionException.class)
    public void transaction_bad_01() {
        try ( RDFConnection conn = connection() ) {
            conn.begin(ReadWrite.WRITE);
            // Should have conn.commit();
            conn.end();
        }
    }
}