/**
 * This file is part of GPGFrontend.
 *
 * GPGFrontend 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.
 *
 * Foobar 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 Foobar.  If not, see <https://www.gnu.org/licenses/>.
 *
 * The initial version of the source code is inherited from gpg4usb-team.
 * Their source code version also complies with GNU General Public License.
 *
 * The source code version of this software was modified and released
 * by Saturneric<eric@bktus.com> starting on May 12, 2021.
 *
 */

#include "ui/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"));
    } else if (mAction == Encrypt) {
        setWindowTitle(tr("Encrypt File"));
    } else if (mAction == Sign) {
        setWindowTitle(tr("Sign File"));
    } else if (mAction == Verify) {
        setWindowTitle(tr("Verify File"));
    }

    setModal(true);

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

    auto *groupBox1 = new QGroupBox(tr("Input Parameters"));

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

    outputFileEdit = new QLineEdit();
    auto *fb2 = new QPushButton("Select");
    connect(fb2, SIGNAL(clicked()), this, SLOT(slotSelectOutputFile()));
    auto *fl2 = new QLabel(tr("Output File"));
    fl2->setBuddy(outputFileEdit);

    auto *gLayout = new QGridLayout();
    gLayout->addWidget(fl1, 0, 0);
    gLayout->addWidget(inputFileEdit, 0, 1);
    gLayout->addWidget(fb1, 0, 2);
    signFileEdit = new QLineEdit();
    // verify does not need outfile, but signature file
    if (mAction != Verify) {
        gLayout->addWidget(fl2, 1, 0);
        gLayout->addWidget(outputFileEdit, 1, 1);
        gLayout->addWidget(fb2, 1, 2);
    } else {
        auto *sfb1 = new QPushButton("Select");
        connect(sfb1, SIGNAL(clicked()), this, SLOT(slotSelectSignFile()));
        auto *sfl1 = new QLabel(tr("Signature File(.sig) Path"));
        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, KeyListRow::ONLY_SECRET_KEY,
                           KeyListColumn::NAME | KeyListColumn::EmailAddress | KeyListColumn::Usage);
   if(mAction == Verify)
        mKeyList->setFilter([](const GpgKey &key) -> bool {
            if(key.disabled || key.expired || key.revoked) return false;
            else return true;
        });

    if(mAction == Encrypt)
        mKeyList->setFilter([](const GpgKey &key) -> bool {
            if(!GpgME::GpgContext::checkIfKeyCanEncr(key)) return false;
            else return true;
        });

    if(mAction == Sign)
        mKeyList->setFilter([](const GpgKey &key) -> bool {
            if(!GpgME::GpgContext::checkIfKeyCanSign(key)) return false;
            else return true;
        });

    if(mAction == Decrypt)
        mKeyList->setDisabled(true);

    mKeyList->slotRefresh();
    mKeyList->setChecked(&keyList);

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

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

    this->setMinimumWidth(480);
    this->show();

}

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.isEmpty()
        && outputFileEdit->text().size() == 0
        && signFileEdit->text().size() == 0) {
        if (mAction == Encrypt) {
            outputFileEdit->setText(infileName + ".asc");
        } else if (mAction == Sign) {
            outputFileEdit->setText(infileName + ".sig");
        } else if (mAction == Verify) {
            signFileEdit->setText(infileName + ".sig");
        } else {
            if (infileName.endsWith(".asc", Qt::CaseInsensitive)) {
                QString ofn = infileName;
                ofn.chop(4);
                outputFileEdit->setText(ofn);
            } else {
                outputFileEdit->setText(infileName + ".out");
            }
        }
    }
}

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

    QString outfileName = QFileDialog::getSaveFileName(this, tr("Save File"), path, nullptr, nullptr,
                                                       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, nullptr, nullptr,
                                                        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;
    }

    QByteArray inBuffer = infile.readAll();
    auto *outBuffer = new QByteArray();
    infile.close();

    QVector<GpgKey> keys;
    mKeyList->getCheckedKeys(keys);

    qDebug() << "slotExecuteAction" << mAction;

    if (mAction == Encrypt) {
        qDebug() << "Action Encrypt";
        gpgme_error_t err = mCtx->encrypt(keys, inBuffer, outBuffer, nullptr);
        if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) {
            qDebug() << "Error" << gpgme_strerror(err);
            QMessageBox::warning(this, tr("Error"),
                                       tr("Error Occurred During Encryption"));
            return;
        }
    }

    if (mAction == Decrypt) {
        qDebug() << "Action Decrypt";
        gpgme_error_t err = mCtx->decrypt(inBuffer, outBuffer, nullptr);
        if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) {
            qDebug() << "Error" << gpgme_strerror(err);
            QMessageBox::warning(this, tr("Error"),
                                 tr("Error Occurred During Decryption"));
            return;
        }
    }

    if (mAction == Sign) {
        qDebug() << "Action Sign";
        gpgme_error_t err = mCtx->sign(keys, inBuffer, outBuffer, true);
        if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) {
            qDebug() << "Error" << gpgme_strerror(err);
            QMessageBox::warning(this, tr("Error"),
                                 tr("Error Occurred During Signature"));
            return;
        }
    }

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

    QFile outfile(outputFileEdit->text());
    if (outfile.exists()) {
        QMessageBox::StandardButton ret;
        ret = QMessageBox::warning(this, tr("File"),
                                   tr("File exists! Do you want to overwrite it?"),
                                   QMessageBox::Ok | QMessageBox::Cancel);
        if (ret == QMessageBox::Cancel) {
            return;
        }
    }

    if (!outfile.open(QFile::WriteOnly)) {
        QMessageBox::warning(this, tr("File"),
                             tr("Cannot write file %1:\n%2.")
                                     .arg(outputFileEdit->text())
                                     .arg(outfile.errorString()));
        return;
    }

    QDataStream out(&outfile);
    out.writeRawData(outBuffer->data(), outBuffer->length());
    outfile.close();
    QMessageBox::information(nullptr, "Done", "Output saved to " + outputFileEdit->text());

    accept();
}

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

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