package org.eparapher.rcp.dialog;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SignatureException;
import java.security.cert.CertificateException;

import org.apache.log4j.Logger;
import org.bouncycastle.asn1.pkcs.CertificationRequestInfo;
import org.bouncycastle.jce.PKCS10CertificationRequest;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.forms.widgets.Form;
import org.eclipse.ui.forms.widgets.FormText;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.Section;
import org.eclipse.ui.forms.widgets.TableWrapData;
import org.eclipse.ui.forms.widgets.TableWrapLayout;
import org.eparapher.rcp.tools.GUIIcons;
import org.eparapher.core.crypto.cert.CertificateInfo;
import org.eparapher.core.crypto.cert.X509Util;
import org.eparapher.core.tools.FileUtil;

/** This is a Dialog that parse and display X.509 certificate fields, extentions and properties
 * <p>Based On :</p> 
 * <ul>
 *   <li>http://www.eclipse.org/articles/Article-Forms/article.html</li>
 *   <li>http://www.eclipse.org/articles/article.php?file=Article-Forms33/index.html</li>
 * </ul>
 * 
 * @author Arnault MICHEL
 *
 */
public class CertificateRequestViewerDialog extends Dialog {

	private static Logger log = Logger.getLogger(CertificateRequestViewerDialog.class);
	
	private String csrfile;
	private String base64CSR;
	private PKCS10CertificationRequest pkcs10csr;
	
	private String title;
		
	private FormToolkit toolkit;
	private Form form;

	private Text  CSRFieldValue;
	//private FormText  CSRFieldValue;
	
	public CertificateRequestViewerDialog(String fileName) {
		super(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell());
		this.setShellStyle(SWT.DIALOG_TRIM  | SWT.RESIZE | getDefaultOrientation());

		if (!new File(fileName).exists())
			log.error("CSR File does not exists");
		this.csrfile = fileName;

		ByteArrayInputStream bais;
		try {
			this.base64CSR = new String(FileUtil.readFile(fileName));
			pkcs10csr = X509Util.getCSRFromPEM(fileName);
		} catch (IOException e) {
			log.error(e);
		} catch (CertificateException e) {
			log.error(e);
		}
	}
	
    protected Control createDialogArea(Composite parent) {
    	
        Composite container = (Composite) super.createDialogArea(parent);
        container.setLayout(new FillLayout());
        
        //title
        toolkit = new FormToolkit(container.getDisplay());
        form = toolkit.createForm(container);
        form.getBody().setLayout(new GridLayout());
        form.setText("Certificate Signing Request");
        
        toolkit.decorateFormHeading(form);
        form.setImage(GUIIcons.DLG_ICON_VALID_CERT);

        //CSR Info
        showCSRInfo();
        
        //CSR
        showBase64CSR();
        
        return container;
    }

    protected void createButtonsForButtonBar(Composite parent) {
        createButton(parent, IDialogConstants.OK_ID,     IDialogConstants.OK_LABEL, true);
        createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
    }

    protected Point getInitialSize() {
        return new Point(600, 600);
    }

	private void showCSRInfo() {
        Section section = toolkit.createSection(form.getBody(), Section.TITLE_BAR| Section.TWISTIE|Section.EXPANDED);
        section.setLayoutData(new GridData(GridData.FILL_HORIZONTAL ));
        //section.addExpansionListener(new ExpAdaptor());
      	section.setText("Certificate request content");
      	Composite sectionClient = toolkit.createComposite(section);
      	sectionClient.setLayout(new TableWrapLayout());

      	CertificationRequestInfo csrinfo = pkcs10csr.getCertificationRequestInfo();
      	String text = null;
      	try {      	
          	text  = "<form>";
          	text += "<li>Integrity : <b>"+(pkcs10csr.verify()?"verified":"KO")+"</b></li>";
          	text += "<li>Subject : <b>" + csrinfo.getSubject() + "</b></li>";
			text += "<li>Keypair : <b>" + CertificateInfo.getPublicKeyInfo( pkcs10csr.getPublicKey() ) + "</b></li>";
	      	//text += "<li>Signature Algorithm : <b>" + pkcs10csr.getSignatureAlgorithm() + "</b></li>";
	      	//text += "<li>Public Key info : <b>" + csrinfo.getSubjectPublicKeyInfo(). + "</b></li>";
	      	text += "</form>";
		} catch (InvalidKeyException e) {
			log.error("Error occured while parsing CSR : "+csrfile,e);
		} catch (NoSuchAlgorithmException e) {
			log.error("Error occured while parsing CSR : "+csrfile,e);
		} catch (NoSuchProviderException e) {
			log.error("Error occured while parsing CSR : "+csrfile,e);
		} catch (SignatureException e) {
			log.error("Error occured when verifying signature of CSR : "+csrfile,e);
		}
      	
      	FormText formText = toolkit.createFormText(sectionClient, true);
      	formText.setText(text, true, false);
      	formText.setLayoutData(new TableWrapData(TableWrapData.FILL));
      	
      	section.setClient(sectionClient);
		
	}

    private void showBase64CSR() {
    	Section section = toolkit.createSection(form.getBody(), Section.DESCRIPTION|Section.TITLE_BAR| Section.TWISTIE|Section.EXPANDED);
      	section.setText("PKCS10, base64 encoded");
      	section.setDescription("copy/paste the complete CSR from here");
      	//section.addExpansionListener(new ExpAdaptor());
      	section.setLayoutData(new GridData(GridData.FILL_BOTH));
      	
      	Composite sectionClient = toolkit.createComposite(section);
      	sectionClient.setLayout(new GridLayout(1,true));
      	sectionClient.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      	
      	CSRFieldValue = toolkit.createText(sectionClient, "", SWT.BORDER|SWT.READ_ONLY|SWT.MULTI);
      	GridData gd = new GridData(GridData.FILL_BOTH);
      	//gd.heightHint = 50;
      	CSRFieldValue.setLayoutData(gd);
      	CSRFieldValue.setText(base64CSR);
      	
      	section.setClient(sectionClient);
	}
    
	/**
	 * Disposes the toolkit
	 */
	public void dispose() {
		toolkit.dispose();
	}
	
	/**
	 * Setting title
	 */
    protected void configureShell(Shell shell) {
        super.configureShell(shell);
        if (title != null) {
			shell.setText(title);
		}
        shell.setImage(GUIIcons.CERTIFICATE_ICON_IMAGE);
    }

}