/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/

#include "mdichild.h"
#include "mainwindow.h"
#include <QtGlobal>
#include <QtWidgets>
#include <memory>

MdiChild::MdiChild() {
  setAttribute(Qt::WA_DeleteOnClose);
  isUntitled = true;
  layoutIdx = 0;
  renderIdx = 0;
  preview = true;
  applyCairo = false;
  settingsSet = false;
}

void MdiChild::newFile() {
  static int sequenceNumber = 1;

  isUntitled = true;
  curFile = tr("graph%1.gv").arg(sequenceNumber++);
  setWindowTitle(curFile + QLatin1String("[*]"));

  connect(document(), &QTextDocument::contentsChange, this,
          &MdiChild::documentWasModified);
}

bool MdiChild::loadFile(const QString &fileName) {
  QFile file(fileName);
  if (!file.open(QFile::ReadOnly | QFile::Text)) {
    QMessageBox::warning(
        this, tr("MDI"),
        tr("Cannot read file %1:\n%2.").arg(fileName).arg(file.errorString()));
    return false;
  }

  QTextStream in(&file);
  QApplication::setOverrideCursor(Qt::WaitCursor);
  setPlainText(in.readAll());
  QApplication::restoreOverrideCursor();

  setCurrentFile(fileName);

  connect(document(), &QTextDocument::contentsChange, this,
          &MdiChild::documentWasModified);

  return true;
}

bool MdiChild::save() {
  if (isUntitled) {
    return saveAs();
  }
  return saveFile(curFile);
}

bool MdiChild::saveAs() {
  QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), curFile);
  if (fileName.isEmpty())
    return false;

  return saveFile(fileName);
}

bool MdiChild::saveFile(const QString &fileName) {
  QFile file(fileName);
  if (!file.open(QFile::WriteOnly | QFile::Text)) {
    QMessageBox::warning(
        this, tr("MDI"),
        tr("Cannot write file %1:\n%2.").arg(fileName).arg(file.errorString()));
    return false;
  }

  QTextStream out(&file);
  QApplication::setOverrideCursor(Qt::WaitCursor);
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
  out.setCodec("UTF-8");
#endif
  out << toPlainText();
  out.flush();
  QApplication::restoreOverrideCursor();

  setCurrentFile(fileName);
  return true;
}

QString MdiChild::userFriendlyCurrentFile() { return strippedName(curFile); }

void MdiChild::closeEvent(QCloseEvent *event) {
  if (maybeSave()) {
    event->accept();
  } else {
    event->ignore();
  }
}

void MdiChild::documentWasModified() {
  setWindowModified(document()->isModified());
}

bool MdiChild::maybeSave() {
  if (document()->isModified()) {
    QMessageBox::StandardButton ret;
    ret = QMessageBox::warning(this, tr("MDI"),
                               tr("'%1' has been modified.\n"
                                  "Do you want to save your changes?")
                                   .arg(userFriendlyCurrentFile()),
                               QMessageBox::Save | QMessageBox::Discard |
                                   QMessageBox::Cancel);
    if (ret == QMessageBox::Save)
      return save();
    if (ret == QMessageBox::Cancel)
      return false;
  }
  return true;
}

void MdiChild::setCurrentFile(const QString &fileName) {
  curFile = QFileInfo(fileName).canonicalFilePath();
  isUntitled = false;
  document()->setModified(false);
  setWindowModified(false);
  setWindowTitle(userFriendlyCurrentFile() + QLatin1String("[*]"));
}

QString MdiChild::strippedName(const QString &fullFileName) {
  return QFileInfo(fullFileName).fileName();
}

bool MdiChild::loadPreview(const QString &fileName) {
  if (previewFrm == nullptr) {
    previewFrm = std::make_unique<ImageViewer>();
    previewFrm->graphWindow = this;
    QMdiSubWindow *s = parentFrm->mdiArea->addSubWindow(previewFrm.get());

    s->resize(600, 400);
    s->move(parentFrm->mdiArea->subWindowList().count() * 5,
            parentFrm->mdiArea->subWindowList().count() * 5);
    previewFrm->subWindowRef = s;
  }
  bool rv = previewFrm->open(fileName);
  if (rv)
    previewFrm->show();
  return rv;
}

bool MdiChild::firstTime() { return settingsSet; }