#include "AudioIO.h"
#include "../CommonCommandFlags.h"
#include "../MenuCreator.h"
#include "Prefs.h"
#include "Project.h"
#include "ProjectAudioIO.h"
#include "ProjectHistory.h"
#include "Track.h"
#include "../TrackPanel.h"
#include "UndoManager.h"
#include "ViewInfo.h"
#include "Viewport.h"
#include "CommandContext.h"
#include "CommandManager.h"
#include "../prefs/GUIPrefs.h"
#include "../prefs/TracksPrefs.h"

#include <wx/app.h>
#include <wx/scrolbar.h>

#include <numeric>

#include "toolbars/ToolManager.h"

// private helper classes and functions
namespace {

double GetZoomOfSelection( const AudacityProject &project )
{
   auto &viewInfo = ViewInfo::Get( project );
   auto &viewport = Viewport::Get(project);

   const double lowerBound =
      std::max(viewInfo.selectedRegion.t0(),
         viewport.ScrollingLowerBoundTime());
   const double denom =
      viewInfo.selectedRegion.t1() - lowerBound;
   if (denom <= 0.0)
      return viewInfo.GetZoom();

   // LL:  The "-1" is just a hack to get around an issue where zooming to
   //      selection doesn't actually get the entire selected region within the
   //      visible area.  This causes a problem with scrolling at end of playback
   //      where the selected region may be scrolled off the left of the screen.
   //      I know this isn't right, but until the real rounding or 1-off issue is
   //      found, this will have to work.
   // PRL:  Did I fix this?  I am not sure, so I leave the hack in place.
   //      Fixes might have resulted from commits
   //      1b8f44d0537d987c59653b11ed75a842b48896ea and
   //      e7c7bb84a966c3b3cc4b3a9717d5f247f25e7296
   auto width = viewInfo.GetTracksUsableWidth();
   return (width - 1) / denom;
}

double GetZoomOfPreset( const AudacityProject &project, int preset )
{

   // Sets a limit on how far we will zoom out as a factor over zoom to fit.
   const double maxZoomOutFactor = 4.0;
   // Sets how many pixels we allow for one uint, such as seconds.
   const double pixelsPerUnit = 5.0;

   double result = 1.0;
   auto &viewport = Viewport::Get(project);
   double zoomToFit = viewport.GetZoomOfToFit();
   using namespace WaveChannelViewConstants;
   switch(preset) {
      default:
      case kZoomDefault:
         result = ZoomInfo::GetDefaultZoom();
         break;
      case kZoomToFit:
         result = zoomToFit;
         break;
      case kZoomToSelection:
         result = GetZoomOfSelection( project );
         break;
      case kZoomMinutes:
         result = pixelsPerUnit * 1.0/60;
         break;
      case kZoomSeconds:
         result = pixelsPerUnit * 1.0;
         break;
      case kZoom5ths:
         result = pixelsPerUnit * 5.0;
         break;
      case kZoom10ths:
         result = pixelsPerUnit * 10.0;
         break;
      case kZoom20ths:
         result = pixelsPerUnit * 20.0;
         break;
      case kZoom50ths:
         result = pixelsPerUnit * 50.0;
         break;
      case kZoom100ths:
         result = pixelsPerUnit * 100.0;
         break;
      case kZoom500ths:
         result = pixelsPerUnit * 500.0;
         break;
      case kZoomMilliSeconds:
         result = pixelsPerUnit * 1000.0;
         break;
      case kZoomSamples:
         result = 44100.0;
         break;
      case kZoom4To1:
         result = 44100.0 * 4;
         break;
      case kMaxZoom:
         result = ZoomInfo::GetMaxZoom();
         break;
   };
   if( result < (zoomToFit/maxZoomOutFactor) )
      result = zoomToFit / maxZoomOutFactor;
   return result;
}

}

namespace {

// Menu handler functions

void OnZoomIn(const CommandContext &context)
{
   auto &project = context.project;
   auto &trackPanel = TrackPanel::Get( project );
   auto &viewport = Viewport::Get(project);

   auto gAudioIO = AudioIO::Get();
   // LLL: Handling positioning differently when audio is
   // actively playing.  Don't do this if paused.
   if (gAudioIO->IsStreamActive(
         ProjectAudioIO::Get(project).GetAudioIOToken()) &&
       !gAudioIO->IsPaused()){
      viewport.ZoomBy(2.0);
      viewport.ScrollIntoView(gAudioIO->GetStreamTime());
   }
   else
      viewport.ZoomAboutSelection(2.0);

   trackPanel.Refresh(false);
}

void OnZoomNormal(const CommandContext &context)
{
   auto &project = context.project;
   auto &trackPanel = TrackPanel::Get( project );
   auto &viewport = Viewport::Get(project);
   viewport.Zoom(ZoomInfo::GetDefaultZoom());
   trackPanel.Refresh(false);
}

void OnZoomOut(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewport = Viewport::Get(project);
   viewport.ZoomAboutCenter(0.5);
}

void OnZoomSel(const CommandContext &context)
{
   auto &project = context.project;
   auto &selectedRegion = ViewInfo::Get( project ).selectedRegion;
   auto &viewport = Viewport::Get(project);
   viewport.Zoom(GetZoomOfSelection(project));
   viewport.SetHorizontalThumb(selectedRegion.t0());
}

void OnZoomToggle(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewInfo = ViewInfo::Get( project );
   auto &trackPanel = TrackPanel::Get( project );
   auto &viewport = Viewport::Get(project);

//   const double origLeft = viewInfo.h;
//   const double origWidth = viewInfo.GetScreenEndTime() - origLeft;

   // Choose the zoom that is most different to the current zoom.
   double Zoom1 = GetZoomOfPreset( project, TracksPrefs::Zoom1Choice() );
   double Zoom2 = GetZoomOfPreset( project, TracksPrefs::Zoom2Choice() );
   double Z = viewInfo.GetZoom();// Current Zoom.
   double ChosenZoom =
      fabs(log(Zoom1 / Z)) > fabs(log( Z / Zoom2)) ? Zoom1:Zoom2;

   viewport.Zoom(ChosenZoom);
   trackPanel.Refresh(false);
//   const double newWidth = GetScreenEndTime() - viewInfo.h;
//   const double newh = origLeft + (origWidth - newWidth) / 2;
//   SetHorizontalThumb(newh);
}

void OnZoomFit(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewport = Viewport::Get(project);
   viewport.ZoomFitHorizontally();
}

void OnZoomFitV(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewport = Viewport::Get(project);
   viewport.ZoomFitVertically();
   ProjectHistory::Get( project ).ModifyState(true);
}

void OnCollapseAllTracks(const CommandContext &context)
{
   auto &project = context.project;
   Viewport::Get(project).CollapseAllTracks();
   ProjectHistory::Get(project).ModifyState(true);
}

void OnExpandAllTracks(const CommandContext &context)
{
   auto &project = context.project;
   Viewport::Get(project).ExpandAllTracks();
   ProjectHistory::Get(project).ModifyState(true);
}

void OnGoSelStart(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewInfo = ViewInfo::Get( project );
   auto &selectedRegion = viewInfo.selectedRegion;
   auto &viewport = Viewport::Get(project);

   if (selectedRegion.isPoint())
      return;

   viewport.SetHorizontalThumb(
      selectedRegion.t0() - ((viewInfo.GetScreenEndTime() - viewInfo.hpos) / 2));
}

void OnGoSelEnd(const CommandContext &context)
{
   auto &project = context.project;
   auto &viewInfo = ViewInfo::Get( project );
   auto &selectedRegion = viewInfo.selectedRegion;
   auto &viewport = Viewport::Get(project);

   if (selectedRegion.isPoint())
      return;

   viewport.SetHorizontalThumb(
      selectedRegion.t1() - ((viewInfo.GetScreenEndTime() - viewInfo.hpos) / 2));
}

void OnShowExtraMenus(const CommandContext &context)
{
   auto &project = context.project;
   auto &commandManager = CommandManager::Get( project );

   bool checked = !gPrefs->Read(wxT("/GUI/ShowExtraMenus"), 0L);
   gPrefs->Write(wxT("/GUI/ShowExtraMenus"), checked);
   gPrefs->Flush();
   commandManager.Check(wxT("ShowExtraMenus"), checked);
   MenuCreator::RebuildAllMenuBars();
}

void OnShowClipping(const CommandContext &context)
{
   auto &project = context.project;
   auto &commandManager = CommandManager::Get( project );
   auto &trackPanel = TrackPanel::Get( project );

   ShowClippingPref().Toggle();
   gPrefs->Flush();

   trackPanel.Refresh(false);
}

void OnShowRMS(const CommandContext &context)
{
   auto &project = context.project;
   auto &trackPanel = TrackPanel::Get( project );

   ShowRMSPref().Toggle();
   gPrefs->Flush();

   ToolManager::ModifyAllProjectToolbarMenus();

   trackPanel.Refresh(false);
}

} // namespace

// Menu definitions

// Under /MenuBar
namespace {
using namespace MenuRegistry;
auto ViewMenu()
{
   static auto menu = std::shared_ptr{
   Menu( wxT("View"), XXO("&View"),
      Section( "Basic",
         Menu( wxT("Zoom"), XXO("&Zoom"),
               Command( wxT("ZoomIn"), XXO("Zoom &In"), OnZoomIn,
                  ZoomInAvailableFlag(), wxT("Ctrl+1") ),
               Command( wxT("ZoomNormal"), XXO("Zoom &Normal"), OnZoomNormal,
                  TracksExistFlag(), wxT("Ctrl+2") ),
               Command( wxT("ZoomOut"), XXO("Zoom &Out"), OnZoomOut,
                  ZoomOutAvailableFlag(), wxT("Ctrl+3") ),
               Command( wxT("ZoomSel"), XXO("&Zoom to Selection"), OnZoomSel,
                  TimeSelectedFlag(), wxT("Ctrl+E") ),
               Command( wxT("ZoomToggle"), XXO("Zoom &Toggle"), OnZoomToggle,
                  TracksExistFlag(), wxT("Shift+Z") )
         ),

         Menu( wxT("TrackSize"), XXO("T&rack Size"),
            Command( wxT("FitInWindow"), XXO("&Fit to Width"), OnZoomFit,
               TracksExistFlag(), wxT("Ctrl+F") ),
            Command( wxT("FitV"), XXO("Fit to &Height"), OnZoomFitV,
               TracksExistFlag(), wxT("Ctrl+Shift+F") ),
            Command( wxT("CollapseAllTracks"), XXO("&Collapse All Tracks"),
               OnCollapseAllTracks, TracksExistFlag(), wxT("Ctrl+Shift+C") ),
            Command( wxT("ExpandAllTracks"), XXO("E&xpand Collapsed Tracks"),
               OnExpandAllTracks, TracksExistFlag(), wxT("Ctrl+Shift+X") )
         ),

         Menu( wxT("SkipTo"), XXO("Sk&ip to"),
            Command( wxT("SkipSelStart"), XXO("Selection Sta&rt"),
               OnGoSelStart, TimeSelectedFlag(),
               Options{ wxT("Ctrl+["), XO("Skip to Selection Start") } ),
            Command( wxT("SkipSelEnd"), XXO("Selection En&d"), OnGoSelEnd,
               TimeSelectedFlag(),
               Options{ wxT("Ctrl+]"), XO("Skip to Selection End") } )
         )
      ),

      Section( "Windows" ),

      Section( "Other",
         Command( wxT("ShowExtraMenus"), XXO("E&xtra Menus"),
            OnShowExtraMenus, AlwaysEnabledFlag,
            Options{}.CheckTest( wxT("/GUI/ShowExtraMenus"), false ) ),
         Command( wxT("ShowClipping"), XXO("&Show Clipping in Waveform"),
            OnShowClipping, AlwaysEnabledFlag,
            Options{}.CheckTest( ShowClippingPref() ) ),
         Command( wxT("ShowRMS"), XXO("Sho&w RMS in Waveform"),
            OnShowRMS, AlwaysEnabledFlag,
            Options{}.CheckTest( ShowRMSPref() ) )
      )
   ) };
   return menu;
}

AttachedItem sAttachment1{ Indirect(ViewMenu()) };
}

#undef FN