/*
 *      fileencryptiondialog.cpp
 *
 *      Copyright 2008 gpg4usb-team <gpg4usb@cpunk.de>
 *
 *      This file is part of gpg4usb.
 *
 *      Gpg4usb is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation, either version 3 of the License, or
 *      (at your option) any later version.
 *
 *      Gpg4usb is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with gpg4usb.  If not, see <http://www.gnu.org/licenses/>
 */

/**
  TODO:
    - OK button should be enabled when at least one key selected
    - option for ascii-armor or pgp binary output
    - KGpgDecrypt has possibility to set outfile, use this, maybe also implemement in KGpgEncrypt
 */

#include "fileencryptiondialog.h"

FileEncryptionDialog::FileEncryptionDialog(GpgME::GpgContext *ctx, QStringList keyList, DialogAction action, QWidget *parent)
        : QDialog(parent)

{
    mAction = action;
    mCtx = ctx;
    if (mAction == Decrypt) {
        setWindowTitle(tr("Decrypt File"));
        resize(500, 200);
    } else if (mAction == Encrypt) {
        setWindowTitle(tr("Encrypt File"));
        resize(500, 400);
    } else if (mAction == Sign) {
        setWindowTitle(tr("Sign File"));
        resize(500, 400);
    } else if (mAction == Verify) {
        setWindowTitle(tr("Verify File"));
        resize(500, 200);
    }

    setModal(true);

    QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
    connect(buttonBox, SIGNAL(accepted()), this, SLOT(slotExecuteAction()));
    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

    // disable ok button till inputfile & outputfile correctly set
    okButton = buttonBox->button(QDialogButtonBox::Ok);
    okButton->setEnabled(false);

    QGroupBox *groupBox1 = new QGroupBox(tr("File"));

    /* Setup input & Outputfileselection*/
    inputFileEdit = new QLineEdit();
    QPushButton *fb1 = new QPushButton("...");
    connect(fb1, SIGNAL(clicked()), this, SLOT(slotSelectInputFile()));
    QLabel *fl1 = new QLabel(tr("Input"));
    fl1->setBuddy(inputFileEdit);

    outputFileEdit = new QLineEdit();
    outputFileEdit->setReadOnly(true);

    QLabel *fl2 = new QLabel(tr("Output"));
    fl2->setBuddy(outputFileEdit);

    QGridLayout *gLayout = new QGridLayout();
    gLayout->addWidget(fl1, 0, 0);
    gLayout->addWidget(inputFileEdit, 0, 1);
    gLayout->addWidget(fb1, 0, 2);
    // verify does not need outfile, but signature file
    if(mAction != Verify) {
        gLayout->addWidget(fl2, 1, 0);
        gLayout->addWidget(outputFileEdit, 1, 1);
    } else {
        signFileEdit = new QLineEdit();
        QPushButton *sfb1 = new QPushButton("...");
        connect(sfb1, SIGNAL(clicked()), this, SLOT(slotSelectSignFile()));
        QLabel *sfl1 = new QLabel(tr("Signature"));
        sfl1->setBuddy(signFileEdit);

        gLayout->addWidget(sfl1, 1, 0);
        gLayout->addWidget(signFileEdit, 1, 1);
        gLayout->addWidget(sfb1, 1, 2);
    }
    groupBox1->setLayout(gLayout);

    /*Setup KeyList*/
    mKeyList = new KeyList(mCtx);
    mKeyList->hide();
    mKeyList->setColumnWidth(2, 150);
    mKeyList->setColumnWidth(3, 150);
    mKeyList->setChecked(&keyList);

    statusLabel = new QLabel();
    statusLabel->setStyleSheet("QLabel {color: red;}");

    QVBoxLayout *vbox2 = new QVBoxLayout();
    vbox2->addWidget(groupBox1);
    vbox2->addWidget(mKeyList);
    vbox2->addWidget(statusLabel);
    vbox2->addWidget(buttonBox);
    vbox2->addStretch(0);
    setLayout(vbox2);

    if(action == Encrypt || action == Sign) {
        slotShowKeyList();
    }

    exec();
}

void FileEncryptionDialog::slotSelectInputFile()
{
    QString path = "";
    if (inputFileEdit->text().size() > 0) {
        path = QFileInfo(inputFileEdit->text()).absolutePath();
    }

//    QString infileName = QFileDialog::getOpenFileName(this, tr("Open File"), path, tr("Files") + tr("All Files (*)"));
    QString infileName = QFileDialog::getOpenFileName(this, tr("Open File"), path);
    inputFileEdit->setText(infileName);

    // try to find a matching output-filename, if not yet done
    if (infileName > 0 ) {
        if (mAction == Encrypt) {
            outputFileEdit->setText(infileName + ".asc");
            checkOutFileOK();
        } else if (mAction == Sign) {
            outputFileEdit->setText(infileName + ".sig");
        } else if (mAction == Verify) {
            signFileEdit->setText(infileName + ".sig");
        } else {
            if (infileName.endsWith(".asc", Qt::CaseInsensitive) || infileName.endsWith(".gpg", Qt::CaseInsensitive)) {
                QString ofn = infileName;
                ofn.chop(4);
                outputFileEdit->setText(ofn);
                checkOutFileOK();
            } /*else {
                outputFileEdit->setText(infileName + ".out");
            }*/
        }
    }
}

/**
 * Raise error if output file already existing, otherwise enable ok button
 * @brief FileEncryptionDialog::checkFileExists
 * @param filename
 */
void FileEncryptionDialog::checkOutFileOK() {
    QFile outfile(outputFileEdit->text());
    if (outfile.exists()){
        statusLabel->setText( tr("File %1 already existing").arg(outputFileEdit->text()));
        outputFileEdit->setStyleSheet("QLineEdit { background: red }");
        okButton->setEnabled(false);
    } else {
        statusLabel->setText("");
        // TODO: this should match the system style for textedits
        outputFileEdit->setStyleSheet("QLineEdit { background: white }");
        okButton->setEnabled(true);
    }
}

void FileEncryptionDialog::slotSelectOutputFile()
{
    QString path = "";
    if (outputFileEdit->text().size() > 0) {
        path = QFileInfo(outputFileEdit->text()).absolutePath();
    }

    QString outfileName = QFileDialog::getSaveFileName(this, tr("Save File"),path, NULL ,NULL ,QFileDialog::DontConfirmOverwrite);
    outputFileEdit->setText(outfileName);

}

void FileEncryptionDialog::slotSelectSignFile()
{
    QString path = "";
    if (signFileEdit->text().size() > 0) {
        path = QFileInfo(signFileEdit->text()).absolutePath();
    }

    QString signfileName = QFileDialog::getSaveFileName(this, tr("Open File"),path, NULL ,NULL ,QFileDialog::DontConfirmOverwrite);
    signFileEdit->setText(signfileName);

    if (inputFileEdit->text().size() == 0 && signfileName.endsWith(".sig", Qt::CaseInsensitive)) {
        QString sfn = signfileName;
        sfn.chop(4);
        inputFileEdit->setText(sfn);
    }

}

void FileEncryptionDialog::slotExecuteAction()
{

    /*QFile infile;
    infile.setFileName(inputFileEdit->text());
    if (!infile.open(QIODevice::ReadOnly)) {
        statusLabel->setText( tr("Couldn't open file"));
        inputFileEdit->setStyleSheet("QLineEdit { background: yellow }");
        return;
    }*/

    QUrl infileURL = QUrl::fromLocalFile(inputFileEdit->text());
    QList<QUrl> infileURLs;
    infileURLs << infileURL;

    if ( mAction == Encrypt ) {

        QStringList *uidList = mKeyList->getChecked();
        QStringList options;
        KGpgEncrypt::EncryptOptions opts = KGpgEncrypt::DefaultEncryption;

        opts |= KGpgEncrypt::AllowUntrustedEncryption;
        opts |= KGpgEncrypt::AsciiArmored;

        KGpgEncrypt *encr = new KGpgEncrypt(this, *uidList, infileURLs, opts, options);
        encr->start();
        connect(encr, SIGNAL(done(int)), SLOT(slotEncryptDone(int)));

        return;
    }
    if ( mAction == Decrypt )  {
    // TODO
    //    if (! mCtx->decrypt(inBuffer, outBuffer)) return;
        //KGpgDecrypt *decr = new KGpgDecrypt(this, infileURLs);
        QUrl outfileURL = QUrl::fromLocalFile(outputFileEdit->text());
        KGpgDecrypt *decr = new KGpgDecrypt(this, infileURL, outfileURL);
        connect(decr, SIGNAL(done(int)), SLOT(slotDecryptDone(int)));
        decr->start();
        return;
    }

    // TODO: with kgpg
    /*if( mAction == Sign ) {
        if(! mCtx->sign(mKeyList->getChecked(), inBuffer, outBuffer, true)) return;
    }*/

    if( mAction == Verify ) {
        QFile signfile;
        signfile.setFileName(signFileEdit->text());
        if (!signfile.open(QIODevice::ReadOnly)) {
            statusLabel->setText( tr("Couldn't open file"));
            signFileEdit->setStyleSheet("QLineEdit { background: yellow }");
            return;
        }
        QByteArray signBuffer = signfile.readAll();
        // TODO
        //new VerifyDetailsDialog(this, mCtx, mKeyList, &inBuffer, &signBuffer);
        return;
    }

    QMessageBox::information(0, "Done", "Output saved to " + outputFileEdit->text());

    accept();
}

void FileEncryptionDialog::slotEncryptDone(int result) {

    KGpgEncrypt *enc = qobject_cast<KGpgEncrypt *>(sender());
    Q_ASSERT(enc != NULL);
    sender()->deleteLater();

    if (result == KGpgTransaction::TS_OK) {
        qDebug() << "FileEncryption succesfull, code: " << result;
        QMessageBox::information(0, tr("Filencryption succesfull"), tr("Output saved to %1").arg(outputFileEdit->text()));
        accept();
    } else {
        QMessageBox::critical(0, tr("Filencryption failed"), enc->getMessages().join( QLatin1String( "\n" )));
        qDebug() << "The fileencryption failed with error code " << result << "reason:" << enc->getMessages().join( QLatin1String( "\n" ));
    }

}

void FileEncryptionDialog::slotDecryptDone(int result) {

    KGpgDecrypt *decr = qobject_cast<KGpgDecrypt *>(sender());
    Q_ASSERT(decr != NULL);
    sender()->deleteLater();

    if (result == KGpgTransaction::TS_OK) {
        qDebug() << "FileDecryption succesfull, code: " << result;
        QMessageBox::information(0, tr("Filedecryption succesfull"), tr("Output saved to %1").arg(outputFileEdit->text()));
        accept();
    } else if (result != KGpgTransaction::TS_USER_ABORTED) {
        QMessageBox::critical(0, tr("Filencryption failed"), decr->getMessages().join( QLatin1String( "\n" )));
        qDebug() << "The fileencryption failed with error code " << result << "reason:" << decr->getMessages().join( QLatin1String( "\n" ));


    }

}

void FileEncryptionDialog::slotShowKeyList()
{
    mKeyList->show();
}

void FileEncryptionDialog::slotHideKeyList()
{
    mKeyList->hide();
}