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package com.fp.excel;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.StringTokenizer;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 *
 * @author malmeida
 */
public class WorkbookFactory implements ExcelToMapMessages {
    
    private InputStream inp;
    
    private String file_path, workbookFactoryStatus, file_extension;
    
    private Workbook wb;
    
    public WorkbookFactory(String file_Path){
        
        this.file_path = file_Path;
        
        this.workbookFactoryStatus = null;
        
        this.inp = this.input_Stream_Builder(this.file_path);
        
        this.wb = this.excel_Workbook_Builder(); 
        
        this.file_extension = null;
   
    }

    private InputStream input_Stream_Builder(String file_Path){
        
        try {
            
            InputStream inpm = new FileInputStream(file_Path);
            
            this.workbookFactoryStatus = WorkbookFactory.INPUT_STREAM_CREATED;
            
            return inpm;
        
        } catch (FileNotFoundException ex) {
            
            this.workbookFactoryStatus = WorkbookFactory.FILE_NOT_FOUND;
            
            return null;
            
        }  
    
    }
    
    private Workbook excel_Workbook_Builder (){
        
        if(this.workbookFactoryStatus.equals(WorkbookFactory.FILE_NOT_FOUND)){
            
            this.workbookFactoryStatus = WorkbookFactory.WORKBOOK_NOT_CREATED;
        
            return null;
        
        }else{
            
            Workbook wbm = null;
            
            try {              
                
                this.file_extension = this.get_Workbook_Extension(this.file_path);
                
                if(this.file_extension.equals("xls")){                
                    
                     wbm = new HSSFWorkbook(this.inp);
                }
                
                if(this.file_extension.equals("xlsx")){
                    
                     wbm = new XSSFWorkbook(this.inp);
                     
                }
                             
                this.workbookFactoryStatus = WorkbookFactory.WORKBOOK_CREATED;
                
                return wbm;
                
            } catch (IOException ex) {
                
                this.workbookFactoryStatus = WorkbookFactory.WORKBOOK_NOT_CREATED;
                
                return null;                
                
            }catch (Exception ex) {
                
                this.workbookFactoryStatus = WorkbookFactory.WORKBOOK_NOT_CREATED;
                
                return null;                
                
            }           
        
        } 
    
    }
    
    private String get_Workbook_Extension(String file_path){
    
        StringTokenizer tkn = new StringTokenizer(file_path,".");
        
        String fe = null;
        
        while (tkn.hasMoreTokens()){
            
            fe = tkn.nextToken();
        
        }
        
        return fe;
    
    }
    
    public String get_WorkbookFactory_Status(){
    
        return this.workbookFactoryStatus;
    
    }
    
    public Workbook get_ExcelWorkBook(){
    
        return this.wb;
    
    }
    
}