/*
 * 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.phoenix.compile;

import static org.apache.phoenix.util.TestUtil.TEST_PROPERTIES;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.phoenix.filter.SkipScanFilter;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.jdbc.PhoenixPreparedStatement;
import org.apache.phoenix.query.BaseConnectionlessQueryTest;
import org.apache.phoenix.util.PropertiesUtil;
import org.apache.phoenix.util.QueryUtil;
import org.apache.phoenix.util.TestUtil;
import org.junit.Test;

/**
 * Test compilation of various statements with hints.
 */
public class StatementHintsCompilationTest extends BaseConnectionlessQueryTest {

  private static boolean usingSkipScan(Scan scan) {
    Filter filter = scan.getFilter();
    if (filter instanceof FilterList) {
      FilterList filterList = (FilterList) filter;
      for (Filter childFilter : filterList.getFilters()) {
        if (childFilter instanceof SkipScanFilter) {
          return true;
        }
      }
      return false;
    }
    return filter instanceof SkipScanFilter;
  }

  private static QueryPlan compileStatement(String query) throws SQLException {
    return compileStatement(query, Collections.emptyList(), null);
  }

  private static QueryPlan compileStatement(String query, List<Object> binds, Integer limit)
    throws SQLException {
    PhoenixConnection pconn =
      DriverManager.getConnection(getUrl(), PropertiesUtil.deepCopy(TEST_PROPERTIES))
        .unwrap(PhoenixConnection.class);
    PhoenixPreparedStatement pstmt = new PhoenixPreparedStatement(pconn, query);
    TestUtil.bindParams(pstmt, binds);
    QueryPlan plan = pstmt.compileQuery();
    assertEquals(limit, plan.getLimit());
    return plan;
  }

  @Test
  public void testSelectForceSkipScan() throws Exception {
    String id = "000000000000001";
    // A where clause without the first column usually compiles into a range scan.
    String query = "SELECT /*+ SKIP_SCAN */ * FROM atable WHERE entity_id='" + id + "'";

    Scan scan = compileStatement(query).getContext().getScan();
    assertTrue("The first filter should be SkipScanFilter.", usingSkipScan(scan));
  }

  @Test
  public void testSelectForceRangeScan() throws Exception {
    String query = "SELECT /*+ RANGE_SCAN */ * FROM atable WHERE organization_id in ("
      + "'000000000000001', '000000000000002', '000000000000003', '000000000000004')";
    Scan scan = compileStatement(query).getContext().getScan();
    // Verify that it is not using SkipScanFilter.
    assertFalse("The first filter should not be SkipScanFilter.", usingSkipScan(scan));
  }

  @Test
  public void testSelectForceRangeScanForEH() throws Exception {
    Connection conn = DriverManager.getConnection(getUrl());
    conn.createStatement().execute(
      "create table eh (organization_id char(15) not null,parent_id char(15) not null, created_date date not null, entity_history_id char(15) not null constraint pk primary key (organization_id, parent_id, created_date, entity_history_id))");
    ResultSet rs = conn.createStatement().executeQuery(
      "explain select /*+ RANGE_SCAN */ ORGANIZATION_ID, PARENT_ID, CREATED_DATE, ENTITY_HISTORY_ID from eh where ORGANIZATION_ID='111111111111111' and SUBSTR(PARENT_ID, 1, 3) = 'foo' and CREATED_DATE >= TO_DATE ('2012-11-01 00:00:00') and CREATED_DATE < TO_DATE ('2012-11-30 00:00:00') order by ORGANIZATION_ID, PARENT_ID, CREATED_DATE DESC, ENTITY_HISTORY_ID limit 100");
    assertEquals(
      "CLIENT PARALLEL 1-WAY RANGE SCAN OVER EH ['111111111111111','foo            ','2012-11-01 00:00:00.000'] - ['111111111111111','fop            ','2012-11-30 00:00:00.000']\n"
        + "    SERVER FILTER BY FIRST KEY ONLY AND (CREATED_DATE >= DATE '2012-11-01 00:00:00.000' AND CREATED_DATE < DATE '2012-11-30 00:00:00.000')\n"
        + "    SERVER TOP 100 ROWS SORTED BY [ORGANIZATION_ID, PARENT_ID, CREATED_DATE DESC, ENTITY_HISTORY_ID]\n"
        + "CLIENT MERGE SORT\nCLIENT LIMIT 100",
      QueryUtil.getExplainPlan(rs));
  }

  @Test
  public void testSerialHint() throws Exception {
    // test AggregatePlan
    String query = "SELECT /*+ SERIAL */ COUNT(*) FROM atable";
    assertTrue("Expected a SERIAL query",
      compileStatement(query).getExplainPlan().getPlanSteps().get(0).contains("SERIAL"));

    // test ScanPlan
    query = "SELECT /*+ SERIAL */ * FROM atable limit 10";
    assertTrue("Expected a SERIAL query", compileStatement(query, Collections.emptyList(), 10)
      .getExplainPlan().getPlanSteps().get(0).contains("SERIAL"));
  }
}
