/*
 * Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.jdbcra.spi;

import javax.naming.*;
import javax.sql.*;
import java.sql.*;
// import javax.sql.DataSource;
public class JdbcSetupAdminImpl implements JdbcSetupAdmin {

    private String tableName;

    private String jndiName;

    private String schemaName;

    private Integer noOfRows;

    public void setTableName(String db) {
        tableName = db;
    }

    public String getTableName(){
        return tableName;
    }

    public void setJndiName(String name){
        jndiName = name;
    }

    public String getJndiName() {
        return jndiName;
    }

    public void setSchemaName(String name){
        schemaName = name;
    }

    public String getSchemaName() {
        return schemaName;
    }

    public void setNoOfRows(Integer i) {
        System.out.println("Setting no of rows :" + i);
        noOfRows = i;
    }

    public Integer getNoOfRows() {
        return noOfRows;
    }

private void printHierarchy(ClassLoader cl, int cnt){
while(cl != null) {
        for(int i =0; i < cnt; i++)
                System.out.print(" " );
        System.out.println("PARENT :" + cl);
        cl = cl.getParent();
        cnt += 3;
}
}

private void compareHierarchy(ClassLoader cl1, ClassLoader cl2 , int cnt){
while(cl1 != null || cl2 != null) {
        for(int i =0; i < cnt; i++)
                System.out.print(" " );
        System.out.println("PARENT of ClassLoader 1 :" + cl1);
        System.out.println("PARENT of ClassLoader 2 :" + cl2);
        System.out.println("EQUALS : " + (cl1 == cl2));
        cl1 = cl1.getParent();
        cl2 = cl2.getParent();
        cnt += 3;
}
}


    public boolean checkSetup(){

        if (jndiName== null || jndiName.trim().equals("")) {
           return false;
        }

        if (tableName== null || tableName.trim().equals("")) {
           return false;
        }

        Connection con = null;
        Statement s = null;
        ResultSet rs = null;
        boolean b = false;
        try {
            InitialContext ic = new InitialContext();
        //debug
        Class clz = DataSource.class;
/*
        if(clz.getClassLoader() != null) {
                System.out.println("DataSource's clasxs : " +  clz.getName() +  " classloader " + clz.getClassLoader());
                printHierarchy(clz.getClassLoader().getParent(), 8);
        }
        Class cls = ic.lookup(jndiName).getClass();
        System.out.println("Looked up class's : " + cls.getPackage() + ":" + cls.getName()  + " classloader "  + cls.getClassLoader());
        printHierarchy(cls.getClassLoader().getParent(), 8);

        System.out.println("Classloaders equal ? " +  (clz.getClassLoader() == cls.getClassLoader()));
        System.out.println("&*&*&*&* Comparing Hierachy DataSource vs lookedup");
        if(clz.getClassLoader() != null) {
                compareHierarchy(clz.getClassLoader(), cls.getClassLoader(), 8);
        }

        System.out.println("Before lookup");
*/
        Object o = ic.lookup(jndiName);
//        System.out.println("after lookup lookup");

            DataSource ds = (DataSource)o ;
/*
        System.out.println("after cast");
        System.out.println("---------- Trying our Stuff !!!");
        try {
                Class o1 = (Class.forName("com.sun.jdbcra.spi.DataSource"));
                ClassLoader cl1 = o1.getClassLoader();
                ClassLoader cl2 = DataSource.class.getClassLoader();
                System.out.println("Cl1 == Cl2" + (cl1 == cl2));
                System.out.println("Classes equal" + (DataSource.class == o1));
        } catch (Exception ex) {
                ex.printStackTrace();
        }
*/
            con = ds.getConnection();
            String fullTableName = tableName;
            if (schemaName != null && (!(schemaName.trim().equals("")))) {
                fullTableName = schemaName.trim() + "." + fullTableName;
            }
            String qry = "select * from " + fullTableName;

            System.out.println("Executing query :" + qry);

            s = con.createStatement();
            rs = s.executeQuery(qry);

            int i = 0;
            if (rs.next()) {
                i++;
            }

            System.out.println("No of rows found:" + i);
            System.out.println("No of rows expected:" + noOfRows);

            if (i == noOfRows.intValue()) {
               b = true;
            } else {
               b = false;
            }
        } catch(Exception e) {
            e.printStackTrace();
            b = false;
        } finally {
            try {
                if (rs != null) rs.close();
                if (s != null) s.close();
                if (con != null) con.close();
            } catch (Exception e) {
            }
        }
        System.out.println("Returning setup :" +b);
        return b;
    }

}