/*
*****************************************************************************
File: ServletEditDeleteBook.java
Desc: this is a servlet updates and deletes books

This assignment represents my work in accordance with Seneca academic policy.
Signed: Mikesh Mistry and Justin Goncalves
*****************************************************************************
*/

package controller;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.*;
import javax.servlet.http.*;
import model.*;

public class ServletEditDeleteBook extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=windows-1252";



    public void doPost(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException,
                                                           IOException {
    //Retreive book values from the Editbook.jsp
    PrintWriter out = response.getWriter();
    String oper = request.getParameter("operation");
   String bookid =request.getParameter("id");
   String len = request.getParameter("displaylendable");
   String title= request.getParameter("displaytitle");
   String author = request.getParameter("displayauthor");
   String sat = request.getParameter("statid");
   String bookcost =request.getParameter("displayprice");
   String bookdesc = request.getParameter("displaydesc");


    if(oper!=null){//check to see if a operation is selected and all values are present and not null
         DBHelperClass db = new DBHelperClass();
         //Creates a bookRowBean object and sets the values that have been passed to the servlet from the page
         BookRowBean updatebook = GeneralHelperClass.SetBookObject(bookid,len,title,author,sat,bookcost,bookdesc);


        //Secondary validation checker (done after javascript as a second security measure)
        // When edit book button is pressed, send DB helper an updated book to update in the database
         if(oper.equals("Edit Book") && GeneralHelperClass.check_values(bookid,len,title,author,sat,bookcost,bookdesc)){

           //this updates the book and calls the DBhelper class and updates the book in the db its passed in the book oject
           if(db.updateBook(updatebook)){
            rdirect(response,request,"NONE","/ViewAllBooks.jsp");
           }else{
               rdirect(response,request,"Update Unsucessfull","/Welcome.jsp");
           }

        // When delete book button is pressed, tell DB helper to delete book
         }else if(oper.equals("Delete Book")){ // for the delete book operation
                if(db.DeleteBook(Integer.parseInt(bookid))){
                  rdirect(response,request,"NONE","/ViewAllBooks.jsp");
                }else{
                   rdirect(response,request,"Delete Unsucess","/Welcome.jsp");
                }
        }




    }
}



    //redirect page using the requestdispatcher
    private void rdirect(HttpServletResponse response,
                         HttpServletRequest request,String value,
                         String target)throws ServletException, IOException {
        RequestDispatcher rd;
        rd = getServletContext().getRequestDispatcher(target);
            rd.forward(request, response);
        return;
    }
}