/*
 *
 * MariaDB Client for Java
 *
 * Copyright (c) 2012-2014 Monty Program Ab.
 * Copyright (c) 2015-2020 MariaDB Corporation Ab.
 *
 * This library 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 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 library; if not, write to Monty Program Ab info@montyprogram.com.
 *
 * This particular MariaDB Client for Java file is work
 * derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
 * the following copyright and notice provisions:
 *
 * Copyright (c) 2009-2011, Marcus Eriksson
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * Neither the name of the driver nor the names of its contributors may not be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS  AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 */

package org.mariadb.jdbc;

import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collections;
import java.util.Properties;
import java.util.logging.Logger;
import javax.sql.*;
import org.mariadb.jdbc.internal.util.constant.HaMode;
import org.mariadb.jdbc.internal.util.exceptions.ExceptionFactory;
import org.mariadb.jdbc.util.DefaultOptions;
import org.mariadb.jdbc.util.Options;

public class MariaDbDataSource implements DataSource, ConnectionPoolDataSource, XADataSource {

  private UrlParser urlParser;

  private String hostname;
  private Integer port = 3306;
  private Integer connectTimeoutInMs;
  private String database;
  private String url;
  private String user;
  private String password;
  private String properties;

  /**
   * Constructor.
   *
   * @param hostname hostname (ipv4, ipv6, dns name)
   * @param port server port
   * @param database database name
   */
  public MariaDbDataSource(String hostname, int port, String database) {
    this.hostname = hostname;
    this.port = port;
    this.database = database;
  }

  public MariaDbDataSource(String url) {
    this.url = url;
  }

  /** Default constructor. hostname will be localhost, port 3306. */
  public MariaDbDataSource() {}

  /**
   * Gets the name of the database.
   *
   * @return the name of the database for this data source
   */
  public String getDatabaseName() {
    if (database != null) {
      return database;
    }
    return (urlParser != null && urlParser.getDatabase() != null) ? urlParser.getDatabase() : "";
  }

  /**
   * Sets the database name.
   *
   * @param database the name of the database
   * @throws SQLException if connection information are erroneous
   */
  public void setDatabaseName(String database) throws SQLException {
    this.database = database;
    reInitializeIfNeeded();
  }

  /**
   * Gets the username.
   *
   * @return the username to use when connecting to the database
   */
  public String getUser() {
    if (user != null) {
      return user;
    }
    return urlParser != null ? urlParser.getUsername() : null;
  }

  /**
   * Sets the username.
   *
   * @param user the username
   * @throws SQLException if connection information are erroneous
   */
  public void setUser(String user) throws SQLException {
    this.user = user;
    reInitializeIfNeeded();
  }

  /**
   * Gets the username.
   *
   * @return the username to use when connecting to the database
   */
  public String getUserName() {
    return getUser();
  }

  /**
   * Sets the username.
   *
   * @param userName the username
   * @throws SQLException if connection information are erroneous
   */
  public void setUserName(String userName) throws SQLException {
    setUser(userName);
  }

  /**
   * Sets the password.
   *
   * @param password the password
   * @throws SQLException if connection information are erroneous
   */
  public void setPassword(String password) throws SQLException {
    this.password = password;
    reInitializeIfNeeded();
  }

  /**
   * Returns the port number.
   *
   * @return the port number
   */
  public int getPort() {
    if (port != 0) {
      return port;
    }
    return urlParser != null ? urlParser.getHostAddresses().get(0).port : 3306;
  }

  /**
   * Sets the database port.
   *
   * @param port the port
   * @throws SQLException if connection information are erroneous
   */
  public void setPort(int port) throws SQLException {
    this.port = port;
    reInitializeIfNeeded();
  }

  /**
   * Returns the port number.
   *
   * @return the port number
   */
  public int getPortNumber() {
    return getPort();
  }

  /**
   * Sets the port number.
   *
   * @param port the port
   * @throws SQLException if connection information are erroneous
   * @see #setPort
   */
  public void setPortNumber(int port) throws SQLException {
    if (port > 0) {
      setPort(port);
    }
  }

  @Deprecated
  public void setProperties(String properties) throws SQLException {
    this.properties = properties;
    reInitializeIfNeeded();
  }

  /**
   * Sets the connection string URL.
   *
   * @param url the connection string
   * @throws SQLException if error in URL
   */
  public void setUrl(String url) throws SQLException {
    this.url = url;
    reInitializeIfNeeded();
  }

  /**
   * Returns the name of the database server.
   *
   * @return the name of the database server
   */
  public String getServerName() {
    if (hostname != null) {
      return hostname;
    }
    boolean hasHost = urlParser != null && this.urlParser.getHostAddresses().get(0).host != null;
    return (hasHost) ? this.urlParser.getHostAddresses().get(0).host : "localhost";
  }

  /**
   * Sets the server name.
   *
   * @param serverName the server name
   * @throws SQLException if connection information are erroneous
   */
  public void setServerName(String serverName) throws SQLException {
    hostname = serverName;
    reInitializeIfNeeded();
  }

  /**
   * Attempts to establish a connection with the data source that this <code>DataSource</code>
   * object represents.
   *
   * @return a connection to the data source
   * @throws SQLException if a database access error occurs
   */
  public Connection getConnection() throws SQLException {
    try {
      if (urlParser == null) {
        initialize();
      }

      return MariaDbConnection.newConnection(urlParser, null);
    } catch (SQLException e) {
      throw ExceptionFactory.INSTANCE.create(e);
    }
  }

  /**
   * Attempts to establish a connection with the data source that this <code>DataSource</code>
   * object represents.
   *
   * @param username the database user on whose behalf the connection is being made
   * @param password the user's password
   * @return a connection to the data source
   * @throws SQLException if a database access error occurs
   */
  public Connection getConnection(final String username, final String password)
      throws SQLException {
    try {
      if (urlParser == null) {
        this.user = username;
        this.password = password;
        initialize();
      }

      UrlParser urlParser = (UrlParser) this.urlParser.clone();
      urlParser.setUsername(username);
      urlParser.setPassword(password);
      return MariaDbConnection.newConnection(urlParser, null);

    } catch (SQLException e) {
      throw ExceptionFactory.INSTANCE.create(e);
    } catch (CloneNotSupportedException cloneException) {
      throw ExceptionFactory.INSTANCE.create("Error in configuration");
    }
  }

  /**
   * Retrieves the log writer for this <code>DataSource</code> object.
   *
   * <p>The log writer is a character output stream to which all logging and tracing messages for
   * this data source will be printed. This includes messages printed by the methods of this object,
   * messages printed by methods of other objects manufactured by this object, and so on. Messages
   * printed to a data source specific log writer are not printed to the log writer associated with
   * the <code>java.sql.DriverManager</code> class. When a <code>DataSource</code> object is
   * created, the log writer is initially null; in other words, the default is for logging to be
   * disabled.
   *
   * @return the log writer for this data source or null if logging is disabled
   * @see #setLogWriter
   */
  public PrintWriter getLogWriter() {
    return null;
  }

  /**
   * Sets the log writer for this <code>DataSource</code> object to the given <code>
   * java.io.PrintWriter</code> object.
   *
   * <p>The log writer is a character output stream to which all logging and tracing messages for
   * this data source will be printed. This includes messages printed by the methods of this object,
   * messages printed by methods of other objects manufactured by this object, and so on. Messages
   * printed to a data source- specific log writer are not printed to the log writer associated with
   * the <code>java.sql.DriverManager</code> class. When a <code>DataSource</code> object is created
   * the log writer is initially null; in other words, the default is for logging to be disabled.
   *
   * @param out the new log writer; to disable logging, set to null
   * @see #getLogWriter
   */
  public void setLogWriter(final PrintWriter out) {
    // not implemented
  }

  /**
   * Gets the maximum time in seconds that this data source can wait while attempting to connect to
   * a database. A value of zero means that the timeout is the default system timeout if there is
   * one; otherwise, it means that there is no timeout. When a <code>DataSource</code> object is
   * created, the login timeout is initially zero.
   *
   * @return the data source login time limit
   * @see #setLoginTimeout
   */
  public int getLoginTimeout() {
    if (connectTimeoutInMs != null) {
      return connectTimeoutInMs / 1000;
    }
    return (urlParser != null) ? urlParser.getOptions().connectTimeout / 1000 : 30;
  }

  /**
   * Sets the maximum time in seconds that this data source will wait while attempting to connect to
   * a database. A value of zero specifies that the timeout is the default system timeout if there
   * is one; otherwise, it specifies that there is no timeout. When a <code>DataSource</code> object
   * is created, the login timeout is initially zero.
   *
   * @param seconds the data source login time limit
   * @see #getLoginTimeout
   */
  @Override
  public void setLoginTimeout(final int seconds) {
    connectTimeoutInMs = seconds * 1000;
  }

  /**
   * Returns an object that implements the given interface to allow access to non-standard methods,
   * or standard methods not exposed by the proxy.
   *
   * <p>If the receiver implements the interface then the result is the receiver or a proxy for the
   * receiver. If the receiver is a wrapper and the wrapped object implements the interface then the
   * result is the wrapped object or a proxy for the wrapped object. Otherwise return the the result
   * of calling <code>unwrap</code> recursively on the wrapped object or a proxy for that result. If
   * the receiver is not a wrapper and does not implement the interface, then an <code>SQLException
   * </code> is thrown.
   *
   * @param iface A Class defining an interface that the result must implement.
   * @return an object that implements the interface. May be a proxy for the actual implementing
   *     object.
   * @throws SQLException If no object found that implements the interface
   * @since 1.6
   */
  public <T> T unwrap(final Class<T> iface) throws SQLException {
    try {
      if (isWrapperFor(iface)) {
        return iface.cast(this);
      } else {
        throw new SQLException(
            "The receiver is not a wrapper and does not implement the interface");
      }
    } catch (Exception e) {
      throw new SQLException("The receiver is not a wrapper and does not implement the interface");
    }
  }

  /**
   * Returns true if this either implements the interface argument or is directly or indirectly a
   * wrapper for an object that does. Returns false otherwise. If this implements the interface then
   * return true, else if this is a wrapper then return the result of recursively calling <code>
   * isWrapperFor</code> on the wrapped object. If this does not implement the interface and is not
   * a wrapper, return false. This method should be implemented as a low-cost operation compared to
   * <code>unwrap</code> so that callers can use this method to avoid expensive <code>unwrap</code>
   * calls that may fail. If this method returns true then calling <code>unwrap</code> with the same
   * argument should succeed.
   *
   * @param interfaceOrWrapper a Class defining an interface.
   * @return true if this implements the interface or directly or indirectly wraps an object that
   *     does.
   * @throws SQLException if an error occurs while determining whether this is a wrapper for an
   *     object with the given interface.
   */
  public boolean isWrapperFor(final Class<?> interfaceOrWrapper) throws SQLException {
    return interfaceOrWrapper.isInstance(this);
  }

  /**
   * Attempts to establish a physical database connection that can be used as a pooled connection.
   *
   * @return a <code>PooledConnection</code> object that is a physical connection to the database
   *     that this <code>ConnectionPoolDataSource</code> object represents
   * @throws SQLException if a database access error occurs
   */
  public PooledConnection getPooledConnection() throws SQLException {
    return new MariaDbPooledConnection((MariaDbConnection) getConnection());
  }

  /**
   * Attempts to establish a physical database connection that can be used as a pooled connection.
   *
   * @param user the database user on whose behalf the connection is being made
   * @param password the user's password
   * @return a <code>PooledConnection</code> object that is a physical connection to the database
   *     that this <code>ConnectionPoolDataSource</code> object represents
   * @throws SQLException if a database access error occurs
   */
  public PooledConnection getPooledConnection(String user, String password) throws SQLException {
    return new MariaDbPooledConnection((MariaDbConnection) getConnection(user, password));
  }

  @Override
  public XAConnection getXAConnection() throws SQLException {
    return new MariaXaConnection((MariaDbConnection) getConnection());
  }

  @Override
  public XAConnection getXAConnection(String user, String password) throws SQLException {
    return new MariaXaConnection((MariaDbConnection) getConnection(user, password));
  }

  public Logger getParentLogger() {
    return null;
  }

  /**
   * For testing purpose only.
   *
   * @return current url parser.
   */
  protected UrlParser getUrlParser() {
    return urlParser;
  }

  private void reInitializeIfNeeded() throws SQLException {
    if (urlParser != null) {
      initialize();
    }
  }

  protected synchronized void initialize() throws SQLException {
    if (url != null && !url.isEmpty()) {
      Properties props = new Properties();
      if (user != null) {
        props.setProperty("user", user);
      }
      if (password != null) {
        props.setProperty("password", password);
      }
      if (database != null) {
        props.setProperty("database", database);
      }
      if (connectTimeoutInMs != null) {
        props.setProperty("connectTimeout", String.valueOf(connectTimeoutInMs));
      }

      urlParser = UrlParser.parse(url, props);

    } else {
      Options options = DefaultOptions.defaultValues(HaMode.NONE);
      options.user = user;
      options.password = password;

      urlParser =
          new UrlParser(
              database,
              Collections.singletonList(
                  new HostAddress(
                      (hostname == null || hostname.isEmpty()) ? "localhost" : hostname,
                      port == null ? 3306 : port)),
              options,
              HaMode.NONE);
      if (properties != null) {
        urlParser.setProperties(properties);
      }
      if (connectTimeoutInMs != null) {
        urlParser.getOptions().connectTimeout = connectTimeoutInMs;
      }
    }
  }
}
