/*
  TimelineState  -  timeline presentation state holder

  Copyright (C)         Lumiera.org
    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>

  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 2 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, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

* *****************************************************/


#include "gui/widget/timeline/timeline-state.hpp"
#include "lib/time/timevalue.hpp"
#include "lib/time/mutation.hpp"
#include "lib/time/control.hpp"

using namespace Gtk;
using namespace sigc;

namespace gui {
namespace widget {
namespace timeline {
  
  using lib::time::FSecs;
  using lib::time::Offset;
  using lib::time::Duration;
  using lib::time::Mutation;
  using lib::time::Control;
  using std::shared_ptr;
  
  
  TimelineState::TimelineState (shared_ptr<model::Sequence> sourceSequence)
    : sequence_(sourceSequence)
    , viewWindow_(Offset(Time::ZERO), 1)
    , selection_(Time::ZERO, Duration::NIL)
    , selectionListener_()
    , playbackPeriod_(Time::ZERO, Duration::NIL)
    , playbackPoint_(Time::ZERO)
    , isPlayback_(false)
    {
      REQUIRE(sequence_);
      
      // Initialise the selection listener
      selectionListener_ (TimeSpan (Time::ZERO, Duration::NIL));
      selectionListener_.connect(
          mem_fun(*this, &TimelineState::on_selection_changed));
      
      ////////////////////////////////////////////////////////////TICKET #798: how to handle GUI default state
      const int64_t DEFAULT_TIMELINE_SCALE =6400;
      
      viewWindow_.set_time_scale(DEFAULT_TIMELINE_SCALE);
      
      setSelection (Mutation::changeTime (Time(FSecs(2))));
      setSelection (Mutation::changeDuration (Duration(FSecs(2))));
      //////////////////////////////////////////////////////TICKET #797 : this looks cheesy. Should provide a single Mutation to change all
    }
  
  
  shared_ptr<model::Sequence>
  TimelineState::getSequence() const
  {
    return sequence_;
  }
  
  
  TimelineViewWindow&
  TimelineState::getViewWindow()
  {
    return viewWindow_;
  }
  
  
  void
  TimelineState::setSelection (Mutation const& change,
                               bool resetPlaybackPeriod)
  {
    selection_.accept (change);
    if (resetPlaybackPeriod)
      setPlaybackPeriod(change);
    
    selectionChangedSignal_.emit();
  }
  
  
  void
  TimelineState::setPlaybackPeriod (Mutation const& change)
  {
    playbackPeriod_.accept (change);
    playbackChangedSignal_.emit();
  }
  
  
  void
  TimelineState::setPlaybackPoint (Time newPosition)
  {
    playbackPoint_ = newPosition;
    playbackChangedSignal_.emit();
  }
  
  
  void
  TimelineState::setSelectionControl (SelectionControl &control)
  {
    control.disconnect();
    selection_.accept (control);
    control.connectChangeNotification (selectionListener_);
  }
  
  
  sigc::signal<void>
  TimelineState::selectionChangedSignal()  const
  {
    return selectionChangedSignal_;
  }
  
  
  sigc::signal<void>
  TimelineState::playbackChangedSignal()  const
  {
    return playbackChangedSignal_;
  }
  
  
  void
  TimelineState::on_selection_changed (TimeSpan)
  {
    selectionChangedSignal_.emit();
  }
  
  
}}}// namespace gui::widget::timeline