/**
 * Copyright MaDgIK Group 2010 - 2013.
 */
package madgik.exareme.jdbc.federated;

import com.google.gson.Gson;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringBufferInputStream;
import java.math.BigDecimal;
import java.net.URL;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.NClob;
import java.sql.ParameterMetaData;
import java.sql.PreparedStatement;
import java.sql.Ref;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.RowId;
import java.sql.SQLException;
import java.sql.SQLXML;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 *
 * @author dimitris
 */
final class AdpPreparedStatement extends AdpStatement implements
    PreparedStatement, ParameterMetaData {
  private String sql;
  private AdpConnection con;
  private boolean closeOnCompletion;
  private Gson g;
  private HttpClient httpclient;
  private InputStreamReader result;
  private int timeout;

  public AdpPreparedStatement(AdpConnection conn, String sqlInitial) {
    super(conn);
    this.sql = sqlInitial;
    this.con = conn;
    this.closeOnCompletion = false;
    this.g = new Gson();
    httpclient = new DefaultHttpClient();
    timeout=0;
  }

  @Override
  public ResultSet executeQuery() throws SQLException {
     if(sql.startsWith("addFederatedEndpoint")||sql.startsWith("removeFederatedEndpoint")){
         AdpRequest q = new AdpRequest(sql, "query", con.getDbPath(), String.valueOf(timeout));
    getResponse(q);
          return new AdpResultSet(manageFederatedEndpoints(sql), this);
      }
     else if(sql.startsWith("select * from") && sql.endsWith("where 0 = 1")){
   	  //schema spy query to collect metadata!!!!
   	  //hack to execute directly to endpoint without connecting to ADP server
   	  
   	  String table= sql.split(" ")[3];
   	  if(table.startsWith("adp")){
		   		  table=table.substring(4);
		   	  }
          table=table.replaceAll("\"", "");
   	  for(Schema endpoint:this.con.getFederatedConnections().getSchemas()){
   		  if(table.toUpperCase().startsWith(endpoint.getId().toUpperCase()+"_")){
   			  Connection remote=this.con.getFederatedConnections().getConnection(endpoint);
   			  String remoteTableName=table.substring(endpoint.getId().length()+1);
                         StringBuilder sb;
                         try (Statement s = remote.createStatement()) {
                             ResultSet first;
                             first = s.executeQuery("select * from "+endpoint.getSchema()+"."+remoteTableName+" where 0=1");
                             ArrayList<ArrayList<String>> schema=new ArrayList<ArrayList<String>>();
                             for(int i=1;i<first.getMetaData().getColumnCount()+1;i++){
                                 ArrayList<String> nextCouple=new ArrayList<String>();
                                 nextCouple.add(first.getMetaData().getColumnName(i));
                                 nextCouple.add(first.getMetaData().getColumnTypeName(i));
                                 schema.add(nextCouple);}
                             HashMap<String, ArrayList<ArrayList<String>>> h=new HashMap<String, ArrayList<ArrayList<String>>>();
                             h.put("schema", schema);
                             h.put("errors", new ArrayList<ArrayList<String>>());
                             Gson g = new Gson();
                             sb = new StringBuilder();
                             sb.append(g.toJson(h, h.getClass()));
                             while(first.next()){
                                 sb.append("\n");
                             ArrayList<Object> res=new ArrayList<Object>();
                             for(int i=1;i<first.getMetaData().getColumnCount()+1;i++){
                                 
                             res.add(first.getObject(i));
                             } 
                             
                             sb.append(g.toJson((ArrayList<Object>) res));
                             }
                             first.close();
                         }  
					
   			      return new AdpResultSet(new InputStreamReader(new StringBufferInputStream(sb.toString())), this.con.createStatement());
   			    
   			    		  }
   	  }
     }
     if(sql.endsWith(") LIMIT 1")||sql.endsWith(") LIMIT 10")){
         sql=sql.replace(") LIMIT 1", ") derivedtablealias LIMIT 1");
     }
    AdpRequest q = new AdpRequest(sql, "query", con.getDbPath(), String.valueOf(timeout));
    getResponse(q);
    return new AdpResultSet(result, this);
      
  }

  @Override
  public int executeUpdate() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet.");
    // return executeUpdate(sql);
  }

  @Override
  public void setNull(int parameterIndex, int sqlType) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBoolean(int parameterIndex, boolean x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setByte(int parameterIndex, byte x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setShort(int parameterIndex, short x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setInt(int parameterIndex, int x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setLong(int parameterIndex, long x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setFloat(int parameterIndex, float x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setDouble(int parameterIndex, double x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBigDecimal(int parameterIndex, BigDecimal x) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setString(int parameterIndex, String x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBytes(int parameterIndex, byte[] x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setDate(int parameterIndex, Date x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setTime(int parameterIndex, Time x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setTimestamp(int parameterIndex, Timestamp x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setAsciiStream(int parameterIndex, InputStream x, int length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setUnicodeStream(int parameterIndex, InputStream x, int length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBinaryStream(int parameterIndex, InputStream x, int length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void clearParameters() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setObject(int parameterIndex, Object x, int targetSqlType) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setObject(int parameterIndex, Object x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public boolean execute() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void addBatch() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setCharacterStream(int parameterIndex, Reader reader, int length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setRef(int parameterIndex, Ref x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBlob(int parameterIndex, Blob x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setClob(int parameterIndex, Clob x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setArray(int parameterIndex, Array x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public ResultSetMetaData getMetaData() throws SQLException {
      //Execute SQL!!!! expensive
      return this.executeQuery().getMetaData();
      
  }

  @Override
  public void setDate(int parameterIndex, Date x, Calendar cal) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setTime(int parameterIndex, Time x, Calendar cal) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setTimestamp(int parameterIndex, Timestamp x, Calendar cal) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNull(int parameterIndex, int sqlType, String typeName) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setURL(int parameterIndex, URL x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public ParameterMetaData getParameterMetaData() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setRowId(int parameterIndex, RowId x) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNString(int parameterIndex, String value) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNCharacterStream(int parameterIndex, Reader value, long length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNClob(int parameterIndex, NClob value) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setClob(int parameterIndex, Reader reader, long length) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBlob(int parameterIndex, InputStream inputStream, long length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNClob(int parameterIndex, Reader reader, long length) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setSQLXML(int parameterIndex, SQLXML xmlObject) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setObject(int parameterIndex, Object x, int targetSqlType,
                        int scaleOrLength) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setAsciiStream(int parameterIndex, InputStream x, long length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBinaryStream(int parameterIndex, InputStream x, long length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setCharacterStream(int parameterIndex, Reader reader, long length)
      throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setAsciiStream(int parameterIndex, InputStream x) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBinaryStream(int parameterIndex, InputStream x) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setCharacterStream(int parameterIndex, Reader reader) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNCharacterStream(int parameterIndex, Reader value) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setClob(int parameterIndex, Reader reader) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setBlob(int parameterIndex, InputStream inputStream) throws
      SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public void setNClob(int parameterIndex, Reader reader) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int getParameterCount() throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int isNullable(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public boolean isSigned(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int getPrecision(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int getScale(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int getParameterType(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public String getParameterTypeName(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public String getParameterClassName(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

  @Override
  public int getParameterMode(int param) throws SQLException {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }
  
  private void getResponse(AdpRequest q) throws SQLException {
    String json = g.toJson(q);
    try {
      HttpPost httppost = new HttpPost(con.getMetaData().getURL());
      StringEntity stringEntity = new StringEntity(json);
      stringEntity.setContentType("application/json");
      httppost.setEntity(stringEntity);
      HttpResponse response = httpclient.execute(httppost);

      HttpEntity resEntity = response.getEntity();
      result = new InputStreamReader(resEntity.getContent());
    } catch (java.io.IOException e) {
      throw new SQLException("Connection to Database failed");
    }
  }

    private InputStreamReader manageFederatedEndpoints(String sql) throws SQLException {
        FederatedConnections federatedCons = con.getFederatedConnections();
        String sqlParams=sql.substring(sql.indexOf("(")+1, sql.lastIndexOf(")"));
        sqlParams=sqlParams.replaceAll(" ", "");
            String[] params=sqlParams.split(",");
        if(sql.startsWith("addFederatedEndpoint")){
            
            
            try {
                Class.forName(params[2]);
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(AdpStatement.class.getName()).log(Level.SEVERE, null, ex);
            }
            Connection conn = null;
            conn = DriverManager.getConnection(params[1],params[3], params[4]);
            federatedCons.putSchema(new Schema(params[0], params[5]), conn);
            return createOKResultStreamReader();
        }
        else{
            federatedCons.removeSchema(new Schema(params[0], params[5]));
            return createOKResultStreamReader();
        }
        
    }
    
    private InputStreamReader createOKResultStreamReader(){
        //HashMap<String, ArrayList<ArrayList<String>>> firstRow=new HashMap<String, ArrayList<ArrayList<String>>>();
      ArrayList<ArrayList<String>> schema=new ArrayList<ArrayList<String>>();
     // ArrayList<String> typenames=new ArrayList<String>();
      //typenames.add("VARCHAR");
     // schema.add(typenames);
      ArrayList<String> names=new ArrayList<String>();
      names.add("RESULT");
      names.add("VARCHAR");
      schema.add(names);
      HashMap<String, ArrayList<ArrayList<String>>> h=new HashMap<String, ArrayList<ArrayList<String>>>();
      h.put("schema", schema);
      h.put("errors", new ArrayList<ArrayList<String>>());
      Gson g = new Gson();
      StringBuilder sb = new StringBuilder();
      sb.append(g.toJson(h, h.getClass()));
      sb.append("\n");
      ArrayList<Object> res=new ArrayList<Object>();
      res.add("OK");
      sb.append(g.toJson((ArrayList<Object>) res));
      return new InputStreamReader(new StringBufferInputStream(sb.toString()));
    }
}