/**********************************************************************************************
    Copyright (C) 2014-2015 Oliver Eichler <oliver.eichler@gmx.de>

    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 "IToolShell.h"

#include <QtWidgets>

#include "theme/CUiTheme.h"

IToolShell::IToolShell(QWidget* parent) : QWidget(parent) {
  connect(&cmd, &QProcess::readyReadStandardError, this, &IToolShell::slotStderr);
  connect(&cmd, &QProcess::readyReadStandardOutput, this, &IToolShell::slotStdout);

  connect(&cmd, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), this,
          &IToolShell::slotFinished);
  connect(&cmd, &QProcess::errorOccurred, this, &IToolShell::slotError);
}

IToolShell::~IToolShell() { text = nullptr; }

void IToolShell::slotError(QProcess::ProcessError error) {
  if (text.isNull()) {
    return;
  }
  text->setTextColor(CUiTheme::foreground(CUiTheme::Role::eError));
  text->insertPlainText(QString(tr("Execution of external program `%1` failed: ")).arg(cmd.program()));
  switch (error) {
    case QProcess::FailedToStart:
      text->insertPlainText(QString(tr("Process cannot be started.\n")));
      text->insertPlainText(
          QString(tr("Make sure the required packages are installed, `%1` exists and is executable.\n"))
              .arg(cmd.program()));
      break;

    case QProcess::Crashed:
      text->insertPlainText(QString(tr("External process crashed.\n")));
      break;

    default:
      text->insertPlainText(QString(tr("An unknown error occurred.\n")));
      break;
  }
}

void IToolShell::slotStderr() {
  if (text.isNull()) {
    return;
  }

  QString str;
  text->setTextColor(CUiTheme::foreground(CUiTheme::Role::eError));
  str = cmd.readAllStandardError();

  if (str[0] == '\r') {
#ifdef Q_OS_WIN64
    if (str.contains("\n")) {
      text->insertPlainText("\n");
    } else
#endif  // Q_OS_WIN64
    {
      text->moveCursor(QTextCursor::End, QTextCursor::MoveAnchor);
      text->moveCursor(QTextCursor::StartOfLine, QTextCursor::MoveAnchor);
      text->moveCursor(QTextCursor::End, QTextCursor::KeepAnchor);
      text->textCursor().removeSelectedText();
    }

#ifdef Q_OS_WIN64
    str = str.split("\r").last().remove("\r").remove("\n");
#else
    str = str.split("\r").last();
#endif
  }

  text->insertPlainText(str);
  text->verticalScrollBar()->setValue(text->verticalScrollBar()->maximum());
}

void IToolShell::slotStdout() {
  if (text.isNull()) {
    return;
  }

  QString str;
  text->setTextColor(CUiTheme::foreground(CUiTheme::Role::eInfo));
  str = cmd.readAllStandardOutput();

  if (str[0] == '\r') {
#ifdef Q_OS_WIN64
    if (str.contains("\n")) {
      text->insertPlainText("\n");
    } else
#endif  // Q_OS_WIN64
    {
      text->moveCursor(QTextCursor::End, QTextCursor::MoveAnchor);
      text->moveCursor(QTextCursor::StartOfLine, QTextCursor::MoveAnchor);
      text->moveCursor(QTextCursor::End, QTextCursor::KeepAnchor);
      text->textCursor().removeSelectedText();
    }

#ifdef Q_OS_WIN64
    str = str.split("\r").last().remove("\r").remove("\n");
#else
    str = str.split("\r").last();
#endif
  }

  text->insertPlainText(str);
  text->verticalScrollBar()->setValue(text->verticalScrollBar()->maximum());
}

void IToolShell::stdOut(const QString& str) {
  if (text.isNull()) {
    return;
  }

  text->setTextColor(text->palette().color(QPalette::Text));
  text->append(str);
}

void IToolShell::stdErr(const QString& str) {
  if (text.isNull()) {
    return;
  }

  text->setTextColor(CUiTheme::foreground(CUiTheme::Role::eError));
  text->append(str);
}

void IToolShell::slotFinished(int exitCode, QProcess::ExitStatus status) {
  if (exitCode || status) {
    if (!text.isNull()) {
      text->setTextColor(CUiTheme::foreground(CUiTheme::Role::eError));
      text->append(tr("!!! failed !!!\n"));
    }
    return;
  }

  finished(exitCode, status);
}
