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/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.db;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Set;
import javax.annotation.CheckForNull;
import javax.annotation.Nullable;
import org.sonar.api.utils.log.Logger;
import org.sonar.api.utils.log.Loggers;

import static com.google.common.collect.Lists.newArrayList;

public class DatabaseUtils {

  public static final int PARTITION_SIZE_FOR_ORACLE = 1000;

  public static void closeQuietly(@Nullable Connection connection) {
    if (connection != null) {
      try {
        connection.close();
      } catch (SQLException e) {
        Loggers.get(DatabaseUtils.class).warn("Fail to close connection", e);
        // ignore
      }
    }
  }

  public static void closeQuietly(@Nullable Statement stmt) {
    if (stmt != null) {
      try {
        stmt.close();
      } catch (SQLException e) {
        Loggers.get(DatabaseUtils.class).warn("Fail to close statement", e);
        // ignore
      }
    }
  }

  public static void closeQuietly(@Nullable ResultSet rs) {
    if (rs != null) {
      try {
        rs.close();
      } catch (SQLException e) {
        Loggers.get(DatabaseUtils.class).warn("Fail to close result set", e);
        // ignore
      }
    }
  }

  /**
   * Returns an escaped value in parameter, with the desired wildcards. Suitable to be used in a like sql query

   * Escapes the "/", "%" and "_" characters.

   * 
   * You must add "ESCAPE '/'" after your like query. It defines '/' as the escape character.
   */
  public static String buildLikeValue(String value, WildcardPosition wildcardPosition) {
    String escapedValue = escapePercentAndUnderscore(value);
    String wildcard = "%";
    switch (wildcardPosition) {
      case BEFORE:
        escapedValue = wildcard + escapedValue;
        break;
      case AFTER:
        escapedValue += wildcard;
        break;
      case BEFORE_AND_AFTER:
        escapedValue = wildcard + escapedValue + wildcard;
        break;
      default:
        throw new UnsupportedOperationException("Unhandled WildcardPosition: " + wildcardPosition);
    }

    return escapedValue;
  }

  /**
   * Replace escape percent and underscore by adding a slash just before
   */
  private static String escapePercentAndUnderscore(String value) {
    return value
      .replaceAll("/", "//")
      .replaceAll("%", "/%")
      .replaceAll("_", "/_");
  }

  /**
   * Partition by 1000 elements a list of input and execute a function on each part.
   *
   * The goal is to prevent issue with ORACLE when there's more than 1000 elements in a 'in ('X', 'Y', ...)'
   * and with MsSQL when there's more than 2000 parameters in a query
   */
  public static > List executeLargeInputs(Collection input, Function, List> function) {
    if (input.isEmpty()) {
      return Collections.emptyList();
    }
    List results = new ArrayList<>(input.size());
    for (List partition : toUniqueAndSortedPartitions(input)) {
      List subResults = function.apply(partition);
      if (subResults != null) {
        results.addAll(subResults);
      }
    }
    return results;
  }

  /**
   * Ensure values {@code inputs} are unique (which avoids useless arguments) and sorted before creating the partition.
   */
  private static > Iterable> toUniqueAndSortedPartitions(Collection inputs) {
    return Iterables.partition(toUniqueAndSortedList(inputs), PARTITION_SIZE_FOR_ORACLE);
  }

  /**
   * Ensure values {@code inputs} are unique (which avoids useless arguments) and sorted so that there is little
   * variations of SQL requests over time as possible with a IN clause and/or a group of OR clauses. Such requests can
   * then be more easily optimized by the SGDB engine.
   */
  public static > List toUniqueAndSortedList(Iterable inputs) {
    if (inputs instanceof Set) {
      // inputs are unique but order is not enforced
      return Ordering.natural().immutableSortedCopy(inputs);
    }
    // inputs are not unique and order is not guaranteed
    return Ordering.natural().immutableSortedCopy(Sets.newHashSet(inputs));
  }

  /**
   * Partition by 1000 elements a list of input and execute a function on each part.
   * The function has not output (ex: delete operation)
   *
   * The goal is to prevent issue with ORACLE when there's more than 1000 elements in a 'in ('X', 'Y', ...)'
   * and with MsSQL when there's more than 2000 parameters in a query
   */
  public static  void executeLargeInputsWithoutOutput(Collection input, Function, Void> function) {
    if (input.isEmpty()) {
      return;
    }

    List> partitions = Lists.partition(newArrayList(input), PARTITION_SIZE_FOR_ORACLE);
    for (List partition : partitions) {
      function.apply(partition);
    }
  }

  public static String repeatCondition(String sql, int count, String separator) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < count; i++) {
      sb.append(sql);
      if (i < count - 1) {
        sb.append(" ").append(separator).append(" ");
      }
    }
    return sb.toString();
  }

  /**
   * Logback does not log exceptions associated to {@link java.sql.SQLException#getNextException()}.
   * See http://jira.qos.ch/browse/LOGBACK-775
   */
  public static void log(Logger logger, SQLException e) {
    SQLException next = e.getNextException();
    while (next != null) {
      logger.error("SQL error: {}. Message: {}", next.getSQLState(), next.getMessage());
      next = next.getNextException();
    }
  }

  @CheckForNull
  public static Long getLong(ResultSet rs, String columnName) throws SQLException {
    long l = rs.getLong(columnName);
    return rs.wasNull() ? null : l;
  }

  @CheckForNull
  public static Double getDouble(ResultSet rs, String columnName) throws SQLException {
    double d = rs.getDouble(columnName);
    return rs.wasNull() ? null : d;
  }

  @CheckForNull
  public static Integer getInt(ResultSet rs, String columnName) throws SQLException {
    int i = rs.getInt(columnName);
    return rs.wasNull() ? null : i;
  }

  @CheckForNull
  public static String getString(ResultSet rs, String columnName) throws SQLException {
    String s = rs.getString(columnName);
    return rs.wasNull() ? null : s;
  }

  @CheckForNull
  public static Long getLong(ResultSet rs, int columnIndex) throws SQLException {
    long l = rs.getLong(columnIndex);
    return rs.wasNull() ? null : l;
  }

  @CheckForNull
  public static Double getDouble(ResultSet rs, int columnIndex) throws SQLException {
    double d = rs.getDouble(columnIndex);
    return rs.wasNull() ? null : d;
  }

  @CheckForNull
  public static Integer getInt(ResultSet rs, int columnIndex) throws SQLException {
    int i = rs.getInt(columnIndex);
    return rs.wasNull() ? null : i;
  }

  @CheckForNull
  public static String getString(ResultSet rs, int columnIndex) throws SQLException {
    String s = rs.getString(columnIndex);
    return rs.wasNull() ? null : s;
  }

  @CheckForNull
  public static Date getDate(ResultSet rs, int columnIndex) throws SQLException {
    Timestamp t = rs.getTimestamp(columnIndex);
    return rs.wasNull() ? null : new Date(t.getTime());
  }
}