/*
 * 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.iotdb.db.integration;

import org.apache.iotdb.integration.env.EnvFactory;
import org.apache.iotdb.itbase.category.ClusterTest;
import org.apache.iotdb.itbase.category.LocalStandaloneTest;
import org.apache.iotdb.itbase.category.RemoteTest;

import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.junit.Assert.fail;

@Category({LocalStandaloneTest.class, ClusterTest.class, RemoteTest.class})
public class IoTDBSetSystemReadOnlyWritableIT {

  private static final String[] sqls1 =
      new String[] {
        "CREATE DATABASE root.ln",
        "create timeseries root.ln.wf01.wt01.status with datatype=BOOLEAN,encoding=PLAIN",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465600000,true)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465660000,true)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465720000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465780000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465840000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465900000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509465960000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509466020000,false)",
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509466080000,false)",
      };

  private static final String[] sqls2 =
      new String[] {
        "insert into root.ln.wf01.wt01(timestamp,status) values(1509466140000,false)",
        "create timeseries root.ln.wf01.wt01.temperature with datatype=FLOAT,encoding=RLE",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465600000,25.957603)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465660000,24.359503)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465720000,20.092794)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465780000,20.182663)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465840000,21.125198)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465900000,22.720892)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509465960000,20.71)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509466020000,21.451046)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509466080000,22.57987)",
        "insert into root.ln.wf01.wt01(timestamp,temperature) values(1509466140000,20.98177)",
        "create timeseries root.ln.wf02.wt02.hardware with datatype=TEXT,encoding=PLAIN",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465600000,'v2')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465660000,'v2')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465720000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465780000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465840000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465900000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509465960000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509466020000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509466080000,'v1')",
        "insert into root.ln.wf02.wt02(timestamp,hardware) values(1509466140000,'v1')",
        "create timeseries root.ln.wf02.wt02.status with datatype=BOOLEAN,encoding=PLAIN",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465600000,true)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465660000,true)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465720000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465780000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465840000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465900000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509465960000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509466020000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509466080000,false)",
        "insert into root.ln.wf02.wt02(timestamp,status) values(1509466140000,false)",
        "CREATE DATABASE root.sgcc",
        "create timeseries root.sgcc.wf03.wt01.status with datatype=BOOLEAN,encoding=PLAIN",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465600000,true)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465660000,true)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465720000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465780000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465840000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465900000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509465960000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509466020000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509466080000,false)",
        "insert into root.sgcc.wf03.wt01(timestamp,status) values(1509466140000,false)",
        "create timeseries root.sgcc.wf03.wt01.temperature with datatype=FLOAT,encoding=RLE",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465600000,25.957603)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465660000,24.359503)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465720000,20.092794)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465780000,20.182663)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465840000,21.125198)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465900000,22.720892)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509465960000,20.71)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509466020000,21.451046)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509466080000,22.57987)",
        "insert into root.sgcc.wf03.wt01(timestamp,temperature) values(1509466140000,20.98177)",
        "flush"
      };

  @BeforeClass
  public static void setUp() throws Exception {
    EnvFactory.getEnv().initBeforeClass();

    importData(sqls1);
  }

  @AfterClass
  public static void tearDown() throws Exception {
    EnvFactory.getEnv().cleanAfterClass();
  }

  private static void importData(String[] sqls) {
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {

      for (String sql : sqls) {
        statement.execute(sql);
      }
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    }
  }

  @Test
  public void setReadOnlyAndWritableTest() throws InterruptedException {
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {
      statement.execute("SET SYSTEM TO READONLY");
      statement.execute("FLUSH");
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    }
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {
      statement.execute(
          "insert into root.ln.wf01.wt01(timestamp,status) values(1509466140000,false)");
      fail();
    } catch (Exception e) {
      Assert.assertEquals(
          "502: Database is read-only, and does not accept non-query operation now",
          e.getMessage());
    }
    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {
      statement.execute("SET SYSTEM TO RUNNING");
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    }
    // Sleep 1s to make sure that other nodes have applied 'SET SYSTEM TO WRITABLE'
    Thread.sleep(1000);
    importData(sqls2);
    String[] retArray =
        new String[] {
          "1509465600000,true,25.96,v2,true,true,25.96,",
          "1509465660000,true,24.36,v2,true,true,24.36,",
          "1509465720000,false,20.09,v1,false,false,20.09,",
          "1509465780000,false,20.18,v1,false,false,20.18,",
          "1509465840000,false,21.13,v1,false,false,21.13,",
          "1509465900000,false,22.72,v1,false,false,22.72,",
          "1509465960000,false,20.71,v1,false,false,20.71,",
          "1509466020000,false,21.45,v1,false,false,21.45,",
          "1509466080000,false,22.58,v1,false,false,22.58,",
          "1509466140000,false,20.98,v1,false,false,20.98,",
        };

    try (Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement()) {
      boolean hasResultSet = statement.execute("select * from root.** where time>10");
      Assert.assertTrue(hasResultSet);

      try (ResultSet resultSet = statement.getResultSet()) {
        ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
        List<Integer> actualIndexToExpectedIndexList =
            checkHeader(
                resultSetMetaData,
                "Time,root.ln.wf01.wt01.status,root.ln.wf01.wt01.temperature,"
                    + "root.ln.wf02.wt02.hardware,root.ln.wf02.wt02.status,root.sgcc.wf03.wt01.status,"
                    + "root.sgcc.wf03.wt01.temperature,",
                new int[] {
                  Types.TIMESTAMP,
                  Types.BOOLEAN,
                  Types.FLOAT,
                  Types.VARCHAR,
                  Types.BOOLEAN,
                  Types.BOOLEAN,
                  Types.FLOAT,
                });

        int cnt = 0;
        while (resultSet.next()) {
          String[] expectedStrings = retArray[cnt].split(",");
          StringBuilder expectedBuilder = new StringBuilder();
          StringBuilder actualBuilder = new StringBuilder();
          for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
            actualBuilder.append(resultSet.getString(i)).append(",");
            expectedBuilder
                .append(expectedStrings[actualIndexToExpectedIndexList.get(i - 1)])
                .append(",");
          }
          Assert.assertEquals(expectedBuilder.toString(), actualBuilder.toString());
          cnt++;
        }
        Assert.assertEquals(10, cnt);
      }
    } catch (Exception e) {
      e.printStackTrace();
      fail(e.getMessage());
    }
  }

  private List<Integer> checkHeader(
      ResultSetMetaData resultSetMetaData, String expectedHeaderStrings, int[] expectedTypes)
      throws SQLException {
    String[] expectedHeaders = expectedHeaderStrings.split(",");
    Map<String, Integer> expectedHeaderToTypeIndexMap = new HashMap<>();
    for (int i = 0; i < expectedHeaders.length; ++i) {
      expectedHeaderToTypeIndexMap.put(expectedHeaders[i], i);
    }

    List<Integer> actualIndexToExpectedIndexList = new ArrayList<>();
    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
      Integer typeIndex = expectedHeaderToTypeIndexMap.get(resultSetMetaData.getColumnName(i));
      Assert.assertNotNull(typeIndex);
      Assert.assertEquals(expectedTypes[typeIndex], resultSetMetaData.getColumnType(i));
      actualIndexToExpectedIndexList.add(typeIndex);
    }
    return actualIndexToExpectedIndexList;
  }
}
