/*
 * LCD Image Converter. Converts images and fonts for embedded applications.
 * Copyright (C) 2016 riuson
 * mailto: riuson@gmail.com
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/
 */

#include "imageeditinexternaltool.h"

#include <QDateTime>
#include <QDir>
#include <QImage>
#include <QMap>
#include <QMessageBox>

#include "datacontainer.h"
#include "externaltooloptions.h"
#include "idocument.h"

namespace Operations
{

ImageEditInExternalTool::ImageEditInExternalTool(QWidget* parentWidget, QObject* parent) : QObject(parent)
{
  this->mParentWidget = parentWidget;
  this->mRunningError = false;
}

bool ImageEditInExternalTool::prepare(const Data::Containers::IDocument* doc, const QStringList& keys)
{
  Q_UNUSED(doc)
  Q_UNUSED(keys)

  return true;
}

void ImageEditInExternalTool::applyDocument(Data::Containers::IDocument* doc, const QStringList& keys)
{
  QMap<QString, QString> files;

  // create map of file names
  int counter = 0;
  QStringListIterator iterator(keys);

  while (iterator.hasNext()) {
    QString key = iterator.next();
    QDateTime time = QDateTime::currentDateTime();

    QString filename = QDir::tempPath();
    filename += "/";
    filename += time.toString("yyyy-MM-dd-hh-mm-ss-zzz");
    filename += "-";
    filename += QString("%1").arg(counter++, 10, 10, QChar('0'));
    filename += ".png";

    files.insert(key, filename);
  }

  // time of last file
  QDateTime lastTime = QDateTime::currentDateTime();

  // save images to files
  iterator.toFront();

  while (iterator.hasNext()) {
    QString key = iterator.next();

    // get image
    const QImage* image = doc->dataContainer()->image(key);

    // save image to file
    QString filename = files.value(key);
    image->save(filename);

    // get last time
    QFileInfo info(filename);
    lastTime = info.lastModified();
  }

  // fill parameters list
  QStringList parameters;
  iterator.toFront();

  while (iterator.hasNext()) {
    QString key = iterator.next();
    QString filename = files.value(key);
    parameters << filename;
  }

  // run external application with this files list as parameter
  QProcess process(this);
  this->connect(&process, SIGNAL(error(QProcess::ProcessError)), SLOT(processError(QProcess::ProcessError)));
  this->mRunningError = false;
  process.start(Settings::ExternalToolOptions::imageEditor(), parameters);

  // wait for external application finished
  do {
    process.waitForFinished();
  } while (process.state() == QProcess::Running);

  if (!this->mRunningError) {
    // find changes
    QStringList changedKeys;

    iterator.toFront();

    while (iterator.hasNext()) {
      QString key = iterator.next();
      QString filename = files.value(key);

      QFileInfo info(filename);

      // if file was modified
      if (info.lastModified() > lastTime) {
        changedKeys << key;
      } else {
        QFile::remove(filename);
      }
    }

    // load changed files
    if (changedKeys.length() > 0) {
      iterator = QStringListIterator(changedKeys);

      while (iterator.hasNext()) {
        QString key = iterator.next();
        QString filename = files.value(key);

        QImage imageLoaded;
        imageLoaded.load(filename);
        QImage imageConverted = imageLoaded.convertToFormat(QImage::Format_ARGB32);
        doc->dataContainer()->setImage(key, &imageConverted);

        QFile::remove(filename);
      }
    }
  }
}

void ImageEditInExternalTool::applyItem(Data::Containers::IDocument* doc, const QString& itemKey)
{
  Q_UNUSED(doc)
  Q_UNUSED(itemKey)
}

void ImageEditInExternalTool::processError(QProcess::ProcessError error)
{
  this->mRunningError = true;

  QString message, description;

  switch (error) {
    case QProcess::FailedToStart:
      message = tr("Failed to Start");
      description = tr("The process failed to start. Either the invoked program is missing, or you may have "
                       "insufficient permissions to invoke the program.");
      break;

    case QProcess::Crashed:
      message = tr("Crashed");
      description = tr("The process crashed some time after starting successfully.");
      break;

    // case QProcess::Timedout:
    //     message = tr("Timedout");
    //     description = tr("The last waitFor...() function timed out. The state of QProcess is unchanged, and you can
    //     try calling waitFor...() again."); break;
    case QProcess::ReadError:
      message = tr("Read Error");
      description = tr(
          "An error occurred when attempting to read from the process. For example, the process may not be running.");
      break;

    case QProcess::WriteError:
      message = tr("Write Error");
      description = tr("An error occurred when attempting to write to the process. For example, the process may not be "
                       "running, or it may have closed its input channel.");
      break;

    case QProcess::UnknownError:
    default:
      message = tr("Unknown Error");
      description = tr("An unknown error occurred.");
      break;
  }

  QMessageBox box(this->mParentWidget);
  box.setTextFormat(Qt::RichText);
  box.setText(
      QString("<b>%1</b>: \"%2\"<br/>%3").arg(message, Settings::ExternalToolOptions::imageEditor(), description));
  box.setWindowTitle(tr("Error running external tool"));
  box.exec();
}

} // namespace Operations