/*
 * Created on Dec 21, 2009
 * (c) 2009 Trumpet, Inc.
 *
 */
package com.itextpdf.testutils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.itextpdf.text.pdf.PdfReader;

/**
 * @author kevin
 */
public final class TestResourceUtils {

    private static final String TESTPREFIX = "itexttest_";
    
    private TestResourceUtils() {
    }
    
    public static String getFullyQualifiedResourceName(Class context, String resourceName){
        return context.getName().replace('.', '/') + "/" + resourceName;
    }
    
    public static InputStream getResourceAsStream(Object context, String resourceName){
        Class contextClass;
        if (context instanceof Class){
            contextClass = (Class)context;
        }else{
            contextClass = context.getClass();
        }
        return contextClass.getClassLoader().getResourceAsStream(getFullyQualifiedResourceName(contextClass, resourceName));
    }

    public static void purgeTempFiles(){
        File tempFolder = new File(System.getProperty("java.io.tmpdir"));
        File[] itextTempFiles = tempFolder.listFiles(new FileFilter(){

            public boolean accept(File pathname) {
                return pathname.getName().startsWith(TESTPREFIX);
            }
            
        });
        
        for (File file : itextTempFiles) {
            if (!file.delete()){
                System.err.println("Unable to delete iText temporary test file " + file);
            }
        }
    }
    
    public static File getResourceAsTempFile(Object context, String resourceName) throws IOException{
        File f = File.createTempFile(TESTPREFIX, ".pdf");
        f.deleteOnExit();
        
        InputStream is = getResourceAsStream(context, resourceName);
        
        final OutputStream os = new BufferedOutputStream(new FileOutputStream(f));

        try{
            writeInputToOutput(is, os);
        } finally {
            is.close();
            os.close();
        }
        
        return f;
    }
    
    public static PdfReader getResourceAsPdfReader(Object context, String resourceName) throws IOException{
        return new PdfReader(new BufferedInputStream(getResourceAsStream(context, resourceName)));
    }
    
    public static byte[] getResourceAsByteArray(Object context, String resourceName) throws IOException{
        InputStream inputStream = getResourceAsStream(context, resourceName);
        
        final ByteArrayOutputStream fileBytes = new ByteArrayOutputStream();
        
        try{
            writeInputToOutput(inputStream, fileBytes);
        } finally {
            inputStream.close();
        }

        return fileBytes.toByteArray();
        
    }
    
    private static void writeInputToOutput(InputStream is, OutputStream os) throws IOException{
        final byte[] buffer = new byte[8192];
        while (true)
        {
          final int bytesRead = is.read(buffer);
          if (bytesRead == -1)
          {
            break;
          }
          os.write(buffer, 0, bytesRead);
        }
        
    }
}