/***********************************************************************
* event-log.cpp - Logs events in a dialog box                          *
*                                                                      *
* This file is part of the FINAL CUT widget toolkit                    *
*                                                                      *
* Copyright 2020-2022 Markus Gans                                      *
*                                                                      *
* FINAL CUT is free software; you can redistribute it and/or modify    *
* it under the terms of the GNU Lesser General Public License as       *
* published by the Free Software Foundation; either version 3 of       *
* the License, or (at your option) any later version.                  *
*                                                                      *
* FINAL CUT 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 Lesser General Public License for more details.                  *
*                                                                      *
* You should have received a copy of the GNU Lesser General Public     *
* License along with this program.  If not, see                        *
* <http://www.gnu.org/licenses/>.                                      *
***********************************************************************/

#include <fstream>
#include <sstream>
#include <tuple>
#include <utility>
#include <vector>

#include <final/final.h>

using finalcut::FPoint;
using finalcut::FSize;

class EventLog;  // class forward declaration

//----------------------------------------------------------------------
// class EventLog::EventLog
//----------------------------------------------------------------------

class EventDialog final : public finalcut::FDialog
{
  public:
    // Constructor
    explicit EventDialog (finalcut::FWidget* = nullptr);

  private:
    // Methods
    void initLayout() override;
    auto getMouseButtonName (const finalcut::MouseButton&) const -> finalcut::FString;
    void logMouseEvent ( const finalcut::FString&
                       , const finalcut::FMouseEvent& );

    // Event handlers
    void onClose (finalcut::FCloseEvent*) override;
    void onShow (finalcut::FShowEvent*) override;
    void onTimer (finalcut::FTimerEvent*) override;
    void onKeyPress (finalcut::FKeyEvent*) override;
    void onMouseDown (finalcut::FMouseEvent*) override;
    void onMouseMove (finalcut::FMouseEvent*) override;
    void onMouseUp (finalcut::FMouseEvent*) override;
    void onMouseDoubleClick (finalcut::FMouseEvent* ev) override;
    void onWindowActive (finalcut::FEvent*) override;
    void onWindowInactive (finalcut::FEvent*) override;
    void onWindowRaised (finalcut::FEvent*) override;
    void onWindowLowered (finalcut::FEvent*) override;

    // Data members
    finalcut::FLog& log{*finalcut::FApplication::getLog()};
    finalcut::FLabel label{this};
};

//----------------------------------------------------------------------
EventDialog::EventDialog (finalcut::FWidget* parent)
  : FDialog{parent}
{
  setShadow();
  label.setText("\n\nUse the keyboard or mouse\n"
                "in this dialog to create events");
  label.setAlignment(finalcut::Align::Center);
  addTimer(60'000);  // Starts the timer every minute
}

//----------------------------------------------------------------------
void EventDialog::initLayout()
{
  using namespace std::string_literals;
  auto gear = "\u2699";
  FDialog::setText ("Event dialog "s + gear);
  FDialog::setGeometry (FPoint{15, 2}, FSize{53, 12});
  label.setGeometry (FPoint(1, 1), getClientSize(), false);
  FDialog::initLayout();
}

//----------------------------------------------------------------------
auto EventDialog::getMouseButtonName (const finalcut::MouseButton& btn_state) const -> finalcut::FString
{
  const auto& empty = finalcut::fc::emptyFString::get();
  auto S = bool(btn_state & finalcut::MouseButton::Shift);
  auto C = bool(btn_state & finalcut::MouseButton::Control);
  auto M = bool(btn_state & finalcut::MouseButton::Meta);
  auto l = bool(btn_state & finalcut::MouseButton::Left);
  auto r = bool(btn_state & finalcut::MouseButton::Right);
  auto m = bool(btn_state & finalcut::MouseButton::Middle);
  auto prefix = (S ? finalcut::FString("Shift+") : empty)
              + (C ? finalcut::FString("Control+") : empty)
              + (M ? finalcut::FString("Meta+") : empty);

  if  ( l )
    return prefix + "left";

  if ( r )
    return prefix + "right";

  if ( m )
    return prefix + "middle";

  return "unknown";
}

//----------------------------------------------------------------------
void EventDialog::logMouseEvent ( const finalcut::FString& state
                                , const finalcut::FMouseEvent& ev )
{
  const int mouse_x = ev.getX();
  const int mouse_y = ev.getY();

  log << finalcut::FLog::LogLevel::Info
      << getMouseButtonName(ev.getButton())
      << " mouse button " << state << " at ("
      << mouse_x << ", " << mouse_y << ")" << std::flush;
}

//----------------------------------------------------------------------
void EventDialog::onClose (finalcut::FCloseEvent* ev)
{
  log.info("The event dialog was closed");
  ev->accept();
}

//----------------------------------------------------------------------
void EventDialog::onShow (finalcut::FShowEvent*)
{
  log.info("The event dialog is now displayed");
}

//----------------------------------------------------------------------
void EventDialog::onTimer (finalcut::FTimerEvent*)
{
  log.info("-- minute marker --");
}


//----------------------------------------------------------------------
void EventDialog::onKeyPress (finalcut::FKeyEvent* ev)
{
  const finalcut::FKey key_id = ev->key();
  finalcut::FString key_name = finalcut::FVTerm::getFOutput()->getKeyName(key_id);

  if ( key_name.isEmpty() )
    key_name = wchar_t(key_id);

  // std::clog redirects all stream data to FLogger
  std::clog << finalcut::FLog::LogLevel::Info
            << "Key " << key_name
            << " (id " << uInt32(key_id) << ")" << std::flush;

  finalcut::FDialog::onKeyPress(ev);
}

//----------------------------------------------------------------------
void EventDialog::onMouseDown (finalcut::FMouseEvent* ev)
{
  logMouseEvent("down", *ev);
  finalcut::FDialog::onMouseDown(ev);
}

//----------------------------------------------------------------------
void EventDialog::onMouseMove (finalcut::FMouseEvent* ev)
{
  logMouseEvent("move", *ev);
  finalcut::FDialog::onMouseMove(ev);
}

//----------------------------------------------------------------------
void EventDialog::onMouseUp (finalcut::FMouseEvent* ev)
{
  logMouseEvent("up", *ev);
  finalcut::FDialog::onMouseUp(ev);
}

//----------------------------------------------------------------------
void EventDialog::onMouseDoubleClick (finalcut::FMouseEvent* ev)
{
  logMouseEvent("double click", *ev);
  finalcut::FDialog::onMouseDoubleClick(ev);
}

//----------------------------------------------------------------------
void EventDialog::onWindowActive (finalcut::FEvent* ev)
{
  log.info("The Event dialog is now active");
  finalcut::FDialog::onWindowActive(ev);
}

//----------------------------------------------------------------------
void EventDialog::onWindowInactive (finalcut::FEvent* ev)
{
  log.info("The Event dialog is now inactive");
  finalcut::FDialog::onWindowInactive(ev);
}


//----------------------------------------------------------------------
void EventDialog::onWindowRaised (finalcut::FEvent* ev)
{
  log.info("The dialog was raised");
  finalcut::FDialog::onWindowRaised(ev);
}

//----------------------------------------------------------------------
void EventDialog::onWindowLowered (finalcut::FEvent* ev)
{
  log.info("The dialog was lowered");
  finalcut::FDialog::onWindowLowered(ev);
}


//----------------------------------------------------------------------
// class EventLog
//----------------------------------------------------------------------

class EventLog final : public finalcut::FDialog
                     , public std::ostringstream
{
  public:
    // Constructor
    explicit EventLog (finalcut::FWidget* = nullptr);

    // Disable copy constructor
    EventLog (const EventLog&) = delete;

    // Disable move constructor
    EventLog (EventLog&&) noexcept = delete;

    // Destructor
    ~EventLog() noexcept override;

    // Disable copy assignment operator (=)
    auto operator = (const EventLog&) -> EventLog& = delete;

    // Disable move assignment operator (=)
    auto operator = (EventLog&&) noexcept -> EventLog& = delete;

    // Event handlers
    void onTimer (finalcut::FTimerEvent*) override;
    void onClose (finalcut::FCloseEvent*) override;

  private:
    // Method
    void initLayout() override;
    void adjustSize() override;

    // Data members
    finalcut::FTextView scrolltext{this};
    EventDialog* event_dialog{new EventDialog(this)};
};

//----------------------------------------------------------------------
EventLog::EventLog (finalcut::FWidget* parent)
  : FDialog{parent}
{
  setMinimumSize (FSize{75, 5});
  setShadow();
  scrolltext.ignorePadding();
  event_dialog->setFocus();
  addTimer(250);  // Starts the timer every 250 milliseconds
}

//----------------------------------------------------------------------
EventLog::~EventLog() noexcept = default;  // destructor

//----------------------------------------------------------------------
void EventLog::onTimer (finalcut::FTimerEvent*)
{
  if ( str().empty() )
    return;

  scrolltext.append(str());
  str("");
  scrolltext.scrollToEnd();
  redraw();
}

//----------------------------------------------------------------------
void EventLog::onClose (finalcut::FCloseEvent* ev)
{
  finalcut::FApplication::closeConfirmationDialog (this, ev);
}

//----------------------------------------------------------------------
void EventLog::initLayout()
{
  using namespace std::string_literals;
  auto lightning = "\u26a1";
  FDialog::setText ("Event log "s + lightning);
  FDialog::setGeometry (FPoint{4, 16}, FSize{75, 8});
  FDialog::setResizeable();
  scrolltext.setGeometry (FPoint{1, 2}, FSize{getWidth(), getHeight() - 1});
  FDialog::initLayout();
}

//----------------------------------------------------------------------
void EventLog::adjustSize()
{
  finalcut::FDialog::adjustSize();
  scrolltext.setGeometry (FPoint{1, 2}, FSize(getWidth(), getHeight() - 1));
}


//----------------------------------------------------------------------
//                               main part
//----------------------------------------------------------------------

auto main (int argc, char* argv[]) -> int
{
  finalcut::FApplication app(argc, argv);
  EventLog dialog(&app);

  // Get the global logger object
  finalcut::FLog& log = *finalcut::FApplication::getLog();

  // Set the line endings (default = CRLF)
  log.setLineEnding (finalcut::FLog::LineEnding::LF);

  // Write a timestamp before each output line
  log.enableTimestamp();

  // Set the dialog object as output stream
  log.setOutputStream(dialog);

  // ----------------------------------------------
  // Remove the comment characters in the following
  // two lines to log the output to a file.
  // ----------------------------------------------
  //std::ofstream file_stream("test.log", std::ofstream::out | std::ofstream::app);
  //log.setOutputStream(file_stream);

  // Sets the dialog as main widget
  finalcut::FWidget::setMainWidget(&dialog);

  // Show the dialog
  dialog.show();

  // Run the application
  return app.exec();
}