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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.tinydb.datasource.unpooled;

import javax.sql.DataSource;
import java.io.PrintWriter;
import java.sql.*;
import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;

public class UnpooledDataSource implements DataSource {

    private ClassLoader driverClassLoader;
    private Properties driverProperties;
    private static Map registeredDrivers = new ConcurrentHashMap();

    private String driver;
    private String url;
    private String username;
    private String password;

    private Boolean autoCommit;
    private Integer defaultTransactionIsolationLevel;

    static {
        Enumeration drivers = DriverManager.getDrivers();
        while (drivers.hasMoreElements()) {
            Driver driver = drivers.nextElement();
            registeredDrivers.put(driver.getClass().getName(), driver);
        }
    }

    public UnpooledDataSource() {
    }

    public UnpooledDataSource(String driver, String url, String username, String password) {
        this.driver = driver;
        this.url = url;
        this.username = username;
        this.password = password;
    }

    public UnpooledDataSource(String driver, String url, Properties driverProperties) {
        this.driver = driver;
        this.url = url;
        this.driverProperties = driverProperties;
    }

    public UnpooledDataSource(ClassLoader driverClassLoader, String driver, String url, String username, String password) {
        this.driverClassLoader = driverClassLoader;
        this.driver = driver;
        this.url = url;
        this.username = username;
        this.password = password;
    }

    public UnpooledDataSource(ClassLoader driverClassLoader, String driver, String url, Properties driverProperties) {
        this.driverClassLoader = driverClassLoader;
        this.driver = driver;
        this.url = url;
        this.driverProperties = driverProperties;
    }

    public Connection getConnection() throws SQLException {
        return doGetConnection(username, password);
    }

    public Connection getConnection(String username, String password) throws SQLException {
        return doGetConnection(username, password);
    }

    public void setLoginTimeout(int loginTimeout) throws SQLException {
        DriverManager.setLoginTimeout(loginTimeout);
    }

    public int getLoginTimeout() throws SQLException {
        return DriverManager.getLoginTimeout();
    }

    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        throw new SQLFeatureNotSupportedException();
    }

    public void setLogWriter(PrintWriter logWriter) throws SQLException {
        DriverManager.setLogWriter(logWriter);
    }

    public PrintWriter getLogWriter() throws SQLException {
        return DriverManager.getLogWriter();
    }

    public ClassLoader getDriverClassLoader() {
        return driverClassLoader;
    }

    public void setDriverClassLoader(ClassLoader driverClassLoader) {
        this.driverClassLoader = driverClassLoader;
    }

    public Properties getDriverProperties() {
        return driverProperties;
    }

    public void setDriverProperties(Properties driverProperties) {
        this.driverProperties = driverProperties;
    }

    public String getDriver() {
        return driver;
    }

    public synchronized void setDriver(String driver) {
        this.driver = driver;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Boolean isAutoCommit() {
        return autoCommit;
    }

    public void setAutoCommit(Boolean autoCommit) {
        this.autoCommit = autoCommit;
    }

    public Integer getDefaultTransactionIsolationLevel() {
        return defaultTransactionIsolationLevel;
    }

    public void setDefaultTransactionIsolationLevel(Integer defaultTransactionIsolationLevel) {
        this.defaultTransactionIsolationLevel = defaultTransactionIsolationLevel;
    }

    private Connection doGetConnection(String username, String password) throws SQLException {
        Properties props = new Properties();
        if (driverProperties != null) {
            props.putAll(driverProperties);
        }
        if (username != null) {
            props.setProperty("user", username);
        }
        if (password != null) {
            props.setProperty("password", password);
        }
        return doGetConnection(props);
    }

    private Connection doGetConnection(Properties properties) throws SQLException {
        initializeDriver();
        Connection connection = DriverManager.getConnection(url, properties);
        configureConnection(connection);
        return connection;
    }

    private synchronized void initializeDriver() throws SQLException {
        if (!registeredDrivers.containsKey(driver)) {
            Class driverType;
            try {
                if (driverClassLoader != null) {
                    driverType = Class.forName(driver, true, driverClassLoader);
                } else {
                    driverType = Class.forName(driver);
                }
                // DriverManager requires the driver to be loaded via the system ClassLoader.
                // http://www.kfu.com/~nsayer/Java/dyn-jdbc.html
                Driver driverInstance = (Driver) driverType.newInstance();
                DriverManager.registerDriver(new DriverProxy(driverInstance));
                registeredDrivers.put(driver, driverInstance);
            } catch (Exception e) {
                throw new SQLException("Error setting driver on UnpooledDataSource. Cause: " + e);
            }
        }
    }

    private void configureConnection(Connection conn) throws SQLException {
        if (autoCommit != null && autoCommit != conn.getAutoCommit()) {
            conn.setAutoCommit(autoCommit);
        }
        if (defaultTransactionIsolationLevel != null) {
            conn.setTransactionIsolation(defaultTransactionIsolationLevel);
        }
    }

    private static class DriverProxy implements Driver {
        private Driver driver;

        DriverProxy(Driver d) {
            this.driver = d;
        }

        public boolean acceptsURL(String u) throws SQLException {
            return this.driver.acceptsURL(u);
        }

        public Connection connect(String u, Properties p) throws SQLException {
            return this.driver.connect(u, p);
        }

        public int getMajorVersion() {
            return this.driver.getMajorVersion();
        }

        public int getMinorVersion() {
            return this.driver.getMinorVersion();
        }

        public DriverPropertyInfo[] getPropertyInfo(String u, Properties p) throws SQLException {
            return this.driver.getPropertyInfo(u, p);
        }

        public boolean jdbcCompliant() {
            return this.driver.jdbcCompliant();
        }

        public Logger getParentLogger() throws SQLFeatureNotSupportedException {
            throw new SQLFeatureNotSupportedException();
        }
    }

    public  T unwrap(Class iface) throws SQLException {
        throw new SQLException(getClass().getName() + " is not a wrapper.");
    }

    public boolean isWrapperFor(Class iface) throws SQLException {
        return false;
    }

}