package ve.gob.cenditel.tibisaymovil;

import java.security.cert.CertificateException;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.X509Certificate;
import java.util.List;

import org.spongycastle.cert.ocsp.OCSPException;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Point;
import android.net.ConnectivityManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class CertValidatorActivity extends Activity implements OnClickListener {

    private final static int PENDING = -1;
    private final static int VALID = 0;
    private final static int INVALID = 1;
    private final static int ERROR = 2;
    private final static int NOT_CONNECTED = 3;
    
    
    //TODO: NEW
    private final static int EXPIRED = 4;
    private final static int NOTYETVALID = 5;
    

    private CertValidatorView viewHolder;
    private String alias;
    private List<Uri> files;
    private AsyncTask<String, Void, X509Certificate[]> certInfoTask = null;
    private AsyncTask<X509Certificate, Void, Integer> validateTask = null;
    private int result = PENDING;
    boolean embedSignature;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
		//Estilando la barra de titulo
		final boolean customTitleSupported = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

        super.onCreate(savedInstanceState);
        this.viewHolder = new CertValidatorView();

        this.alias = getIntent().getStringExtra(IntentExtraField.ALIAS);
        this.files = getIntent().getParcelableArrayListExtra(IntentExtraField.FILES);
        this.embedSignature = getIntent().getBooleanExtra(IntentExtraField.EMBED_SIGNATURE_IN_PDF, false);
        Toast.makeText(this, "embebed="+embedSignature, Toast.LENGTH_SHORT).show();

        
        if (files.isEmpty())
        	finish();

        if (savedInstanceState == null || (this.result = savedInstanceState.getInt("result")) == PENDING) {
            startValidation();
        } else {
            if (isConnected() && FsUtils.containsPDF(this.files)) {
//                CertValidatorActivity.this.viewHolder.embedSignature.setEnabled(true);
            }
            setValidationResult(this.result);
        }
        //Estilando Barra de titulo
		if(customTitleSupported)
			getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title_bar);
    }

    @Override
    protected void onDestroy() {

        super.onDestroy();
        if (this.certInfoTask != null) {
            this.certInfoTask.cancel(true);
        }
        if (this.validateTask != null) {
            this.validateTask.cancel(true);
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);
        outState.putInt("result", this.result);
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()) {

        case R.id.button_cancel_zone:
            setResult(RESULT_CANCELED);
            finish();
            break;

        case R.id.button_accept_zone:

            Intent intent = new Intent();
            intent.putExtra(IntentExtraField.EMBED_SIGNATURE_IN_PDF, embedSignature);
            setResult(Activity.RESULT_OK, intent);
            finish();
        }
    }

    private boolean isConnected() {

        ConnectivityManager cm =
            (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        return cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected();
    }

    private void startValidation() {

        this.certInfoTask  = new AsyncTask<String, Void, X509Certificate[]>() {

            @Override
            protected X509Certificate[] doInBackground(String... alias) {
                KeyChainStrategy keyChain = KeyChainStrategy.getInstance();
                X509Certificate[] chain = null;
                try {
                    chain = keyChain.getCertificateChain(alias[0]);
                } catch (Exception e) {
                    return null;
                }
                return chain;
            }

            @Override
            protected void onPostExecute(X509Certificate[] chain) {

                if (chain == null) {
                    setValidationResult(CertValidatorActivity.ERROR);
                } else {
                    CertValidatorActivity.this.viewHolder.setData(
                            CertificateUtils.getSubject(chain[0]),
                            CertificateUtils.getSerial(chain[0]),
                            CertificateUtils.getIssuer(chain[0]),
                            CertValidatorActivity.this.files);

                    if (isConnected()) {
                        if (FsUtils.containsPDF(CertValidatorActivity.this.files)) {
//                            CertValidatorActivity.this.viewHolder.embedSignature.setEnabled(true);
                        }
//                        validate(chain);
                    } else {
                        setValidationResult(NOT_CONNECTED);
                    }
                }
            }

        }.execute(alias);
    }

    private void validate(X509Certificate[] chain) {

        this.validateTask = new AsyncTask<X509Certificate, Void, Integer>() {

            @Override
            protected Integer doInBackground(X509Certificate... params) {

                if (params.length < 2) {
                    return ValidationResult.ERROR_CHAIN_RESULT;
                }
                try {
                    params[0].checkValidity();
                    String DEFAULT_OCSP_RESPONDER = "http://ocsp.suscerte.gob.ve/";
                    
                    //Antiguo
                    /*if (CertificateUtils.checkWithOCSP(params[0], params[2],DEFAULT_OCSP_RESPONDER)) {
                        return VALID;
                    } else {
                        return INVALID;
                    }*/
                    
                    ValidationResult res;
                   
                    res= CertificateUtils.checkWithOCSP(params[0], params[params.length-1],DEFAULT_OCSP_RESPONDER);
                    
                    int result = res.getResultValue();
                    
                    
                    if (result==ValidationResult.GOOD_RESULT)
                    	return VALID;
                    else if (result==ValidationResult.ERROR_CONNECTION_RESULT)
                    	return NOT_CONNECTED;
                    else 
                    	return result;

                    
                } catch (CertificateExpiredException e) {
                    return EXPIRED;
                } catch (CertificateNotYetValidException e) {
                    return NOTYETVALID;
                } catch (CertificateException e) {
                    return ValidationResult.UNKNOWN_RESULT;    
                } catch (OCSPException e) {
                    return ValidationResult.UNKNOWN_RESULT;  
                } catch (Exception e) {
                    return ERROR;
                }
            }

            @Override
            protected void onPostExecute(Integer result) {

                CertValidatorActivity.this.setValidationResult(result);
            }
        }.execute(chain);
    }

    private void setValidationResult(int result) {

        this.result = result;
        this.viewHolder.accept.setEnabled(true);

//        this.viewHolder.validationStatus.removeAllViews();
        
        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams (
        		LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, 0.5F);

        View v = null;

        TextView text;
//        switch (result) {
//
//        
//        
//        case VALID:
//            v = inflater.inflate(R.layout.certificate_valid, null);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//        case INVALID:
//        	v = inflater.inflate(R.layout.certificate_not_valid, null);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//
//        case ERROR:
//        	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//            
//            
//            //TODO: NEW MESSAGES
//        case ValidationResult.ERROR_CHAIN_RESULT:
//        	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.ERROR_CHAIN_RESULT);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//        case ValidationResult.GOOD_RESULT:
//            v = inflater.inflate(R.layout.certificate_valid, null);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//            
//        case ValidationResult.ERROR_CONNECTION_RESULT:
//         	v = inflater.inflate(R.layout.certificate_not_connected, null);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//        case ValidationResult.GOOD_UNTRUSTED_RESULT:
//         	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.GOOD_UNTRUSTED_RESULT);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//         
//        case ValidationResult.REVOKED_RESULT:
//         	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.REVOKED_RESULT);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//
//        case ValidationResult.UNKNOWN_RESULT:
//          	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.UNKNOWN_RESULT);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//
//        case EXPIRED:
//          	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.EXPIRED);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//            
//        case NOTYETVALID:
//          	v=inflater.inflate(R.layout.certificate_validation_failed, null);
//        	text = (TextView) v.findViewById(R.id.fail_text);
//        	text.setText(R.string.NOTYETVALID);
//            this.viewHolder.validationStatus.addView(v, params);
//            break;
//
//        default: // NOT_CONNECTED
//        	v = inflater.inflate(R.layout.certificate_not_connected, null);
//            this.viewHolder.validationStatus.addView(v, params);
//        }

        
        WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
//        this.viewHolder.validationStatus.setMinimumWidth(display.getWidth()/2);
//        this.viewHolder.embedSignature.setMinimumWidth(display.getWidth()/2);
        this.viewHolder.fixing.getParent().childDrawableStateChanged(this.viewHolder.fixing);
    }

    private class CertValidatorView {

//        public CheckBox embedSignature;
        public TextView certificateData;
        public TextView documentsData;
//        public ViewGroup validationStatus;
        public LinearLayout accept;
        public LinearLayout cancel;
        public LinearLayout fixing;

        public CertValidatorView() {

            setContentView(R.layout.cert_validation);

//            this.embedSignature = (CheckBox) findViewById(R.id.embed_signature);
            this.certificateData = (TextView) findViewById(R.id.cert_data);
            this.documentsData = (TextView) findViewById(R.id.docs_data);
            this.certificateData.setMovementMethod(new ScrollingMovementMethod());
            this.documentsData.setMovementMethod(new ScrollingMovementMethod());
//            this.validationStatus = (ViewGroup) findViewById(R.id.validation_status);
            this.accept = (LinearLayout) findViewById(R.id.button_accept_zone);
            this.accept.setOnClickListener(CertValidatorActivity.this);
//            this.accept.setEnabled(false);
            this.cancel = (LinearLayout) findViewById(R.id.button_cancel_zone);
            this.cancel.setOnClickListener(CertValidatorActivity.this);
            
            this.fixing = (LinearLayout) findViewById(R.id.fixing);
            
            
        }

        public void setData(String subject, String serial, String issuer, List<Uri> files) {

            StringBuilder builder = new StringBuilder();
            StringBuilder builderDocs = new StringBuilder();
            Resources res = CertValidatorActivity.this.getResources();

            builder.append(res.getString(R.string.subject));
            builder.append(":\n");
            builder.append(subject);
            builder.append("\n\n");

            builder.append(res.getString(R.string.serial_number));
            builder.append(":\n");
            builder.append(serial);
            builder.append("\n\n");

            builder.append(res.getString(R.string.issuer));
            builder.append(":\n");
            builder.append(issuer);
            builder.append("\n\n");

            for (Uri file : files) {
            	builderDocs.append("\n - ");
            	builderDocs.append(file.getLastPathSegment());
            }

            this.certificateData.setText(builder.toString());
            this.documentsData.setText(builderDocs.toString());
        }
    }
}