/**
 * 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.camel.component.sql;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;

public class SqlGeneratedKeysTest extends CamelTestSupport {

    private EmbeddedDatabase db;

    @Before
    public void setUp() throws Exception {
        // Only HSQLDB seem to handle:
        // - more than one generated column in row
        // - return all keys generated in batch insert
        db = new EmbeddedDatabaseBuilder()
            .setType(EmbeddedDatabaseType.HSQL).addScript("sql/createAndPopulateDatabase3.sql").build();

        super.setUp();
    }

    @After
    public void tearDown() throws Exception {
        super.tearDown();

        db.shutdown();
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                getContext().getComponent("sql", SqlComponent.class).setDataSource(db);
                from("direct:insert").to("sql:insert into projects (project, license, description) values (#, #, #)");
                from("direct:batch").to("sql:insert into projects (project, license, description) values (#, #, #)?batch=true");
                from("direct:select").to("sql:select * from projects order by id asc");
                from("direct:insert2").to("sql:insert into developers (name, position) values (#, #)");
            }
        };
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testRetrieveGeneratedKey() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:insert");

        Exchange exchange = endpoint.createExchange();
        exchange.getIn().setBody(new Object[] {"project x", "ASF", "new project"});
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        // assertions of the response
        assertNotNull(out);
        assertNotNull(out.getOut());
        assertNotNull(out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA));

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertNotNull("out body could not be converted to a List - was: "
                + out.getOut().getBody(), generatedKeys);
        assertEquals(1, generatedKeys.get(0).size());

        Map<String, Object> row = generatedKeys.get(0);
        assertEquals("auto increment value should be 3", Integer.valueOf(3), row.get("ID"));

        assertEquals("generated keys row count should be one", 1, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testRetrieveGeneratedKeys() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:insert2");

        Exchange exchange = endpoint.createExchange();
        exchange.getIn().setBody(new Object[] {"Star Swirl", "Wizard"});
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);
        exchange.getIn().setHeader(SqlConstants.SQL_GENERATED_COLUMNS, new String[]{"ID1", "ID2"});
        exchange.getIn().setHeader("foo", "123");

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        // assertions of the response
        assertNotNull(out);
        assertNotNull(out.getOut());
        assertNotNull(out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA));
        assertEquals("123", out.getOut().getHeader("foo"));

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertNotNull("out body could not be converted to a List - was: "
            + out.getOut().getBody(), generatedKeys);
        assertEquals(2, generatedKeys.get(0).size());

        Map<String, Object> row = generatedKeys.get(0);
        assertEquals("auto increment value of ID1 should be 5", Integer.valueOf(5), row.get("ID1"));
        assertEquals("auto increment value of ID2 should be 6", Integer.valueOf(6), row.get("ID2"));

        assertEquals("generated keys row count should be one", 1, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testRetrieveGeneratedKeysForBatch() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:batch");

        Exchange exchange = endpoint.createExchange();
        List<Object[]> payload = new ArrayList<Object[]>(4);
        payload.add(new Object[] {"project x", "ASF", "new project x"});
        payload.add(new Object[] {"project y", "ASF", "new project y"});
        payload.add(new Object[] {"project z", "ASF", "new project z"});
        payload.add(new Object[] {"project q", "ASF", "new project q"});
        exchange.getIn().setBody(payload);
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);
        exchange.getIn().setHeader("foo", "123");

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        // assertions of the response
        assertNotNull(out);
        assertNotNull(out.getOut());
        assertNotNull(out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA));
        assertEquals("123", out.getOut().getHeader("foo"));

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertNotNull("out body could not be converted to a List - was: "
            + out.getOut().getBody(), generatedKeys);

         // it seems not to work with Derby...
        assertEquals(4, generatedKeys.size());

        int id = 3;
        for (Map<String, Object> row : generatedKeys) {
            assertEquals("auto increment value should be " + id, Integer.valueOf(id++), row.get("ID"));
        }

        assertEquals("generated keys row count should be four", 4, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testRetrieveGeneratedKeyWithStringGeneratedColumns() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:insert");

        Exchange exchange = endpoint.createExchange();
        exchange.getIn().setBody(new Object[] {"project x", "ASF", "new project"});
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);
        exchange.getIn().setHeader(SqlConstants.SQL_GENERATED_COLUMNS, new String[]{"ID"});
        exchange.getIn().setHeader("foo", "123");

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        // assertions of the response
        assertNotNull(out);
        assertNotNull(out.getOut());
        assertNotNull(out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA));
        assertEquals("123", out.getOut().getHeader("foo"));

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertNotNull("out body could not be converted to a List - was: "
                + out.getOut().getBody(), generatedKeys);
        assertEquals(1, generatedKeys.get(0).size());

        Map<String, Object> row = generatedKeys.get(0);
        assertEquals("auto increment value should be 3", Integer.valueOf(3), row.get("ID"));

        assertEquals("generated keys row count should be one", 1, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testRetrieveGeneratedKeyWithIntGeneratedColumns() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:insert");

        Exchange exchange = endpoint.createExchange();
        exchange.getIn().setBody(new Object[] {"project x", "ASF", "new project"});
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);
        exchange.getIn().setHeader(SqlConstants.SQL_GENERATED_COLUMNS, new int[]{1});
        exchange.getIn().setHeader("foo", "123");

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        // assertions of the response
        assertNotNull(out);
        assertNotNull(out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA));
        assertEquals("123", out.getOut().getHeader("foo"));

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertNotNull("out body could not be converted to a List - was: "
                + out.getOut().getBody(), generatedKeys);
        assertEquals(1, generatedKeys.get(0).size());

        Map<String, Object> row = generatedKeys.get(0);
        assertEquals("auto increment value should be 3", Integer.valueOf(3), row.get("ID"));

        assertEquals("generated keys row count should be one", 1, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }

    @Test
    public void testGivenAnInvalidGeneratedColumnsHeaderThenAnExceptionIsThrown() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:insert");

        Exchange exchange = endpoint.createExchange();
        // then we set the SQL on the in body
        exchange.getIn().setBody(new Object[] {"project x", "ASF", "new project"});
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);

        // set wrong data type for generated columns
        exchange.getIn().setHeader(SqlConstants.SQL_GENERATED_COLUMNS, new Object[]{});

        // now we send the exchange to the endpoint, and receives the response from Camel
        template.send(endpoint, exchange);

        assertTrue(exchange.isFailed());
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testNoKeysForSelect() throws Exception {
        // first we create our exchange using the endpoint
        Endpoint endpoint = context.getEndpoint("direct:select");

        Exchange exchange = endpoint.createExchange();
        // then we set the SQL on the in body
        exchange.getIn().setHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, true);

        // now we send the exchange to the endpoint, and receives the response from Camel
        Exchange out = template.send(endpoint, exchange);

        List<Map<String, Object>> result = out.getOut().getBody(List.class);
        assertEquals("We should get 3 projects", 3, result.size());

        List<Map<String, Object>> generatedKeys = out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, List.class);
        assertEquals("We should not get any keys", 0, generatedKeys.size());
        assertEquals("We should not get any keys", 0, out.getOut().getHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT));
    }
}