package de.uhilger.baselink;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Ulrich Hilger
 */
public class Script extends DBActor {
  private static final Logger logger = Logger.getLogger(Script.class.getName());
  
  public Script(PersistenceManager pm) {
    this.pm = pm;
  }
  /**
   * Execute an SQL statement and return keys generated in the database
   * @param sql  the statement to execute
   * @return  a list of generated keys
   */
  public List<Map<String, Object>> executeWithKeys(String sql) {
    List<Map<String, Object>> keys = null;
    Connection c = null;
    try {
      c = pm.getConnection();
      keys = executeWithKeys(c, sql);
      c.close();
      c = null;
    } catch (SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeConnectionFinally(c);
    }
    return keys;
  }

  /**
   * Execute an SQL statement and return keys generated in the database
   * @param c  database connection to use
   * @param sql  the statement to execute
   * @return  a list of generated keys
   */
  public List<Map<String, Object>> executeWithKeys(Connection c, String sql) {
    List<Map<String, Object>> keys = null;
    Statement s = null;
    try {
      s = c.createStatement();
      s.executeUpdate(sql, Statement.RETURN_GENERATED_KEYS);
      keys = pm.toList(s.getGeneratedKeys());
      s.close();
      s = null;
    } catch (SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeStatementFinally(s);
    }
    return keys;
  }

  /**
   * Execute an SQL statement
   * @param sql  the statement to execute
   * @return  the number of records affected by this statement or -1 if none
   */
  public int execute(String sql) {
    int numRows = -1;
    Connection c = null;
    try {
      c = pm.getConnection();
      numRows = execute(c, sql);
      c.close();
      c = null;
    } catch (SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeConnectionFinally(c);
    }
    return numRows;
  }

  /**
   * Execute an SQL statement
   * @param c  database connection to use
   * @param sql  the statement to execute
   * @return  the number of records affected by this statement or -1 if none
   */
  public int execute(Connection c, String sql) {
    int numRows = -1;
    Statement s = null;
    try {
      s = c.createStatement();
      numRows = s.executeUpdate(sql);
      s.close();
      s = null;
    } catch (SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeStatementFinally(s);
    }
    return numRows;
  }

  /**
   * Execute an SQL statement
   * @param sql the SQL string with ? at the position of params
   * @param params list of parameters in the order they appear in the SQL string
   * @return  the number of records affected by this statement or -1 if none
   */
  public int execute(String sql, Object... params) {
    int numRows = -1;
    Connection c = null;
    try {
      c = pm.getConnection();
      numRows = execute(c, sql, params);
      c.close();
      c = null;
    } catch (SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeConnectionFinally(c);
    }
    return numRows;
  }

  /**
   * Execute an SQL statement
   * @param c  database connection to use
   * @param sql the SQL string with ? at the position of params
   * @param params list of parameters in the order they appear in the SQL string
   * @return  the number of records affected by this statement or -1 if none
   */
  public int execute(Connection c, String sql, Object... params) {
    int numRows = -1;
    Statement s = null;
    try {
      //s = c.createStatement();
      s = pm.buildQuery(c, sql, params);
      if(s != null && s instanceof PreparedStatement) {
        try (PreparedStatement ps = (PreparedStatement) s) {
          numRows = ps.executeUpdate();
        }
      }
      s = null;
    } catch (Exception ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeStatementFinally(s);
    }
    return numRows;
  }
  
  /**
   * Execute an SQL script
   * @param sqlScript  the SQL script to execute
   * @return an array of row counts referring to the number of affected rows of 
   * each sql statement in the script in the order of SQL commands in the script 
   * Statement.EXECUTE_FAILED indicates failure of single steps in the script 
   * Statement.SUCCESS_NO_INFO indicates successful execution without information 
   * about the number of affected rows
   */
  public int[] executeScript(String sqlScript) {
    int[] ergebnisse = null;
    Connection c = null;
    Statement s = null;
    try {
      c = pm.getConnection();
      s = c.createStatement();
      String[] sqlKommandos = sqlScript.split(";");
      for (String sqlKommando : sqlKommandos) {
        s.addBatch(sqlKommando);
      }
      ergebnisse = s.executeBatch();
    } catch(SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeStatementFinally(s);
      pm.closeConnectionFinally(c);
    }
    return ergebnisse;
  }
  
  /**
   * Execute an SQL script
   * @param c  the Connection object to use
   * @param sqlScript  the SQL script to execute
   * @return an array of row counts referring to the number of affected rows of 
   * each sql statement in the script in the order of SQL commands in the script 
   * Statement.EXECUTE_FAILED indicates failure of single steps in the script 
   * Statement.SUCCESS_NO_INFO indicates successful execution without information 
   * about the number of affected rows
   */
  public int[] executeScript(Connection c, String sqlScript) {
    int[] ergebnisse = null;
    Statement s = null;
    try {
      s = c.createStatement();
      String[] sqlKommandos = sqlScript.split(";");
      for (String sqlKommando : sqlKommandos) {
        s.addBatch(sqlKommando);
      }
      ergebnisse = s.executeBatch();
    } catch(SQLException ex) {
      logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
    } finally {
      pm.closeStatementFinally(s);
    }
    return ergebnisse;
  }
    
}