/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2019 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed 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.pentaho.di.core.database;

import org.pentaho.di.core.Const;
import org.pentaho.di.core.row.ValueMetaInterface;

/**
 * Contains SAP DB specific information through static final members
 *
 * @author Matt
 * @since 30-06-2005
 */

public class SAPDBDatabaseMeta extends BaseDatabaseMeta implements DatabaseInterface {
  @Override
  public int[] getAccessTypeList() {
    return new int[] {
      DatabaseMeta.TYPE_ACCESS_NATIVE, DatabaseMeta.TYPE_ACCESS_ODBC, DatabaseMeta.TYPE_ACCESS_JNDI };
  }

  @Override
  public int getDefaultDatabasePort() {
    // if (getAccessType()==DatabaseMeta.TYPE_ACCESS_NATIVE) return 3050;
    return -1;
  }

  /**
   * @return Whether or not the database can use auto increment type of fields (pk)
   */
  @Override
  public boolean supportsAutoInc() {
    return false;
  }

  @Override
  public String getDriverClass() {
    if ( getAccessType() == DatabaseMeta.TYPE_ACCESS_ODBC ) {
      return "sun.jdbc.odbc.JdbcOdbcDriver";
    } else {
      return "com.sap.dbtech.jdbc.DriverSapDB";
    }
  }

  @Override
  public String getURL( String hostname, String port, String databaseName ) {
    if ( getAccessType() == DatabaseMeta.TYPE_ACCESS_ODBC ) {
      return "jdbc:odbc:" + databaseName;
    } else {
      return "jdbc:sapdb://" + hostname + "/" + databaseName;
    }
  }

  /**
   * @return true if the database supports bitmap indexes
   */
  @Override
  public boolean supportsBitmapIndex() {
    return false;
  }

  /**
   * @return true if the database supports synonyms
   */
  @Override
  public boolean supportsSynonyms() {
    return false;
  }

  /**
   * Generates the SQL statement to add a column to the specified table
   *
   * @param tablename
   *          The table to add
   * @param v
   *          The column defined as a value
   * @param tk
   *          the name of the technical key field
   * @param useAutoinc
   *          whether or not this field uses auto increment
   * @param pk
   *          the name of the primary key field
   * @param semicolon
   *          whether or not to add a semi-colon behind the statement.
   * @return the SQL statement to add a column to the specified table
   */
  @Override
  public String getAddColumnStatement( String tablename, ValueMetaInterface v, String tk, boolean useAutoinc,
    String pk, boolean semicolon ) {
    return "ALTER TABLE " + tablename + " ADD " + getFieldDefinition( v, tk, pk, useAutoinc, true, false );
  }

  /**
   * Generates the SQL statement to modify a column in the specified table
   *
   * @param tablename
   *          The table to add
   * @param v
   *          The column defined as a value
   * @param tk
   *          the name of the technical key field
   * @param useAutoinc
   *          whether or not this field uses auto increment
   * @param pk
   *          the name of the primary key field
   * @param semicolon
   *          whether or not to add a semi-colon behind the statement.
   * @return the SQL statement to modify a column in the specified table
   */
  @Override
  public String getModifyColumnStatement( String tablename, ValueMetaInterface v, String tk, boolean useAutoinc,
    String pk, boolean semicolon ) {
    return "ALTER TABLE "
      + tablename + " ALTER COLUMN " + v.getName() + " TYPE "
      + getFieldDefinition( v, tk, pk, useAutoinc, false, false );
  }

  @Override
  public String getFieldDefinition( ValueMetaInterface v, String tk, String pk, boolean useAutoinc,
                                    boolean addFieldName, boolean addCr ) {
    String retval = "";

    String fieldname = v.getName();
    int length = v.getLength();
    int precision = v.getPrecision();

    if ( addFieldName ) {
      if ( Const.indexOfString( fieldname, getReservedWords() ) >= 0 ) {
        retval += getStartQuote() + fieldname + getEndQuote();
      } else {
        retval += fieldname + " ";
      }
    }

    int type = v.getType();
    switch ( type ) {
      case ValueMetaInterface.TYPE_TIMESTAMP:
      case ValueMetaInterface.TYPE_DATE:
        retval += "TIMESTAMP";
        break;
      case ValueMetaInterface.TYPE_BOOLEAN:
        retval += "CHAR(1)";
        break;
      case ValueMetaInterface.TYPE_NUMBER:
      case ValueMetaInterface.TYPE_INTEGER:
      case ValueMetaInterface.TYPE_BIGNUMBER:
        if ( fieldname.equalsIgnoreCase( tk ) || // Technical key
          fieldname.equalsIgnoreCase( pk ) // Primary key
        ) {
          retval += "BIGINT NOT NULL PRIMARY KEY";
        } else {
          if ( length > 0 ) {
            if ( precision > 0 || length > 18 ) {
              retval += "DECIMAL(" + length;
              if ( precision > 0 ) {
                retval += ", " + precision;
              }
              retval += ")";
            } else {
              if ( length > 9 ) {
                retval += "INT64";
              } else {
                if ( length < 5 ) {
                  retval += "SMALLINT";
                } else {
                  retval += "INTEGER";
                }
              }
            }

          } else {
            retval += "DOUBLE";
          }
        }
        break;
      case ValueMetaInterface.TYPE_STRING:
        if ( length < 32720 ) {
          retval += "VARCHAR";
          if ( length > 0 ) {
            retval += "(" + length + ")";
          } else {
            retval += "(8000)"; // Maybe use some default DB String length?
          }
        } else {
          retval += "BLOB SUB_TYPE TEXT";
        }
        break;
      default:
        retval += " UNKNOWN";
        break;
    }

    if ( addCr ) {
      retval += Const.CR;
    }

    return retval;
  }

  @Override
  public String[] getReservedWords() {
    return new String[] {
      "ABS", "ABSOLUTE", "ACOS", "ADDDATE", "ADDTIME", "ALL", "ALPHA", "ALTER", "ANY", "ASCII", "ASIN", "ATAN",
      "ATAN2", "AVG", "BINARY", "BIT", "BOOLEAN", "BYTE", "CASE", "CEIL", "CEILING", "CHAR", "CHARACTER",
      "CHECK", "CHR", "COLUMN", "CONCAT", "CONSTRAINT", "COS", "COSH", "COT", "COUNT", "CROSS", "CURDATE",
      "CURRENT", "CURTIME", "DATABASE", "DATE", "DATEDIFF", "DAY", "DAYNAME", "DAYOFMONTH", "DAYOFWEEK",
      "DAYOFYEAR", "DEC", "DECIMAL", "DECODE", "DEFAULT", "DEGREES", "DELETE", "DIGITS", "DISTINCT", "DOUBLE",
      "EXCEPT", "EXISTS", "EXP", "EXPAND", "FIRST", "FIXED", "FLOAT", "FLOOR", "FOR", "FROM", "FULL",
      "GET_OBJECTNAME", "GET_SCHEMA", "GRAPHIC", "GREATEST", "GROUP", "HAVING", "HEX", "HEXTORAW", "HOUR",
      "IFNULL", "IGNORE", "INDEX", "INITCAP", "INNER", "INSERT", "INT", "INTEGER", "INTERNAL", "INTERSECT",
      "INTO", "JOIN", "KEY", "LAST", "LCASE", "LEAST", "LEFT", "LENGTH", "LFILL", "LIST", "LN", "LOCATE", "LOG",
      "LOG10", "LONG", "LONGFILE", "LOWER", "LPAD", "LTRIM", "MAKEDATE", "MAKETIME", "MAPCHAR", "MAX", "MBCS",
      "MICROSECOND", "MIN", "MINUTE", "MOD", "MONTH", "MONTHNAME", "NATURAL", "NCHAR", "NEXT", "NO", "NOROUND",
      "NOT", "NOW", "NULL", "NUM", "NUMERIC", "OBJECT", "OF", "ON", "ORDER", "PACKED", "PI", "POWER", "PREV",
      "PRIMARY", "RADIANS", "REAL", "REJECT", "RELATIVE", "REPLACE", "RFILL", "RIGHT", "ROUND", "ROWID",
      "ROWNO", "RPAD", "RTRIM", "SECOND", "SELECT", "SELUPD", "SERIAL", "SET", "SHOW", "SIGN", "SIN", "SINH",
      "SMALLINT", "SOME", "SOUNDEX", "SPACE", "SQRT", "STAMP", "STATISTICS", "STDDEV", "SUBDATE", "SUBSTR",
      "SUBSTRING", "SUBTIME", "SUM", "SYSDBA", "TABLE", "TAN", "TANH", "TIME", "TIMEDIFF", "TIMESTAMP",
      "TIMEZONE", "TO", "TOIDENTIFIER", "TRANSACTION", "TRANSLATE", "TRIM", "TRUNC", "TRUNCATE", "UCASE", "UID",
      "UNICODE", "UNION", "UPDATE", "UPPER", "USER", "USERGROUP", "USING", "UTCDATE", "UTCDIFF", "VALUE",
      "VALUES", "VARCHAR", "VARGRAPHIC", "VARIANCE", "WEEK", "WEEKOFYEAR", "WHEN", "WHERE", "WITH", "YEAR",
      "ZONED" };
  }

  @Override
  public String[] getUsedLibraries() {
    return new String[] { "sapdbc.jar" };
  }

}
