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

  Audacity: A Digital Audio Editor

  Wahwah.cpp

  Effect programming:
  Nasca Octavian Paul

  UI programming:
  Dominic Mazzoni (with the help of wxDesigner)
  Vaughan Johnson (Preview)

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

#include <math.h>

#include <wx/intl.h>

#include "Wahwah.h"
#include "../WaveTrack.h"
#include "../FFT.h"

//
// EffectWahwah
//

#define lfoskipsamples 30

EffectWahwah::EffectWahwah()
{
   freq = float(1.5);
   startphase = 0;
   depth = (float)0.7;
   freqofs = (float)0.3;
   res = float(2.5);
}

wxString EffectWahwah::GetEffectDescription() { 
   // Note: This is useful only after values have been set. 
   return wxString::Format(_("Applied effect: %s frequency = %.1f Hz, start phase = %.0f deg, depth = %.0f%%, resonance = %.1f, frequency offset = %.0f%%"),
                           (const char *)(this->GetEffectName()), 
                           freq, 
                           (startphase * 180 / M_PI), 
                           (depth * 100), 
                           res, 
                           (freqofs * 100)); 
} 

bool EffectWahwah::PromptUser()
{
   WahwahDialog dlog(this, mParent, -1, _("Wahwah"));

   dlog.freq = freq;
   dlog.freqoff = freqofs * 100;
   dlog.startphase = startphase * 180 / M_PI;
   dlog.res = res;
   dlog.depth = depth * 100;

   dlog.TransferDataToWindow();
   dlog.CentreOnParent();
   dlog.ShowModal();

   if (!dlog.GetReturnCode())
      return false;

   freq = dlog.freq;
   freqofs = dlog.freqoff / 100;
   startphase = dlog.startphase * M_PI / 180;
   res = dlog.res;
   depth = dlog.depth / 100;

   return true;
}

bool EffectWahwah::NewTrackSimpleMono()
{
   lfoskip = freq * 2 * M_PI / mCurRate;
   skipcount = 0;
   xn1 = 0;
   xn2 = 0;
   yn1 = 0;
   yn2 = 0;
   b0 = 0;
   b1 = 0;
   b2 = 0;
   a0 = 0;
   a1 = 0;
   a2 = 0;

   phase = startphase;
   if (mCurChannel == Track::RightChannel)
      phase += M_PI;

   return true;
}

bool EffectWahwah::ProcessSimpleMono(float *buffer, sampleCount len)
{
   float frequency, omega, sn, cs, alpha;
   float in, out;

   for (int i = 0; i < len; i++) {
      in = buffer[i];
      
      if ((skipcount++) % lfoskipsamples == 0) {
         frequency = (1 + cos(skipcount * lfoskip + phase)) / 2;
         frequency = frequency * depth * (1 - freqofs) + freqofs;
         frequency = exp((frequency - 1) * 6);
         omega = M_PI * frequency;
         sn = sin(omega);
         cs = cos(omega);
         alpha = sn / (2 * res);
         b0 = (1 - cs) / 2;
         b1 = 1 - cs;
         b2 = (1 - cs) / 2;
         a0 = 1 + alpha;
         a1 = -2 * cs;
         a2 = 1 - alpha;
      };
      out = (b0 * in + b1 * xn1 + b2 * xn2 - a1 * yn1 - a2 * yn2) / a0;
      xn2 = xn1;
      xn1 = in;
      yn2 = yn1;
      yn1 = out;
      
      // Prevents clipping
      if (out < -1.0)
         out = float(-1.0);
      else if (out > 1.0)
         out = float(1.0);
      
      buffer[i] = (float) out;
   }

   return true;
}

// WDR: class implementations

//----------------------------------------------------------------------------
// WahwahDialog
//----------------------------------------------------------------------------

#define FREQ_MIN 1
#define FREQ_MAX 40
#define FREQOFF_MIN 0
#define FREQOFF_MAX 100
#define PHASE_MIN 0
#define PHASE_MAX 359
#define DEPTH_MIN 0
#define DEPTH_MAX 100
#define RES_MIN 0
#define RES_MAX 100

// WDR: event table for WahwahDialog

BEGIN_EVENT_TABLE(WahwahDialog, wxDialog)
    EVT_BUTTON(wxID_OK, WahwahDialog::OnOk)
    EVT_BUTTON(wxID_CANCEL, WahwahDialog::OnCancel)
    EVT_TEXT(ID_FREQTEXT, WahwahDialog::OnFreqText)
    EVT_TEXT(ID_FREQOFFTEXT, WahwahDialog::OnFreqOffText)
    EVT_TEXT(ID_PHASETEXT, WahwahDialog::OnPhaseText)
    EVT_TEXT(ID_DEPTHTEXT, WahwahDialog::OnDepthText)
    EVT_TEXT(ID_RESONANCETEXT, WahwahDialog::OnResonanceText)
    EVT_SLIDER(ID_FREQSLIDER, WahwahDialog::OnFreqSlider)
    EVT_SLIDER(ID_FREQOFFSLIDER, WahwahDialog::OnFreqOffSlider)
    EVT_SLIDER(ID_PHASESLIDER, WahwahDialog::OnPhaseSlider)
    EVT_SLIDER(ID_DEPTHSLIDER, WahwahDialog::OnDepthSlider)
    EVT_SLIDER(ID_RESONANCESLIDER, WahwahDialog::OnResonanceSlider)
    EVT_BUTTON(ID_BUTTON_PREVIEW, WahwahDialog::OnPreview)
END_EVENT_TABLE()

WahwahDialog::WahwahDialog(EffectWahwah * effect, 
									wxWindow * parent, wxWindowID id, const wxString & title, 
									const wxPoint & position, const wxSize & size, long style):
wxDialog(parent, id, title, position, size, style)
{
	m_pEffect = effect;
   CreateWahwahDialog(this, TRUE);
}

bool WahwahDialog::Validate()
{
   return TRUE;
}

bool WahwahDialog::TransferDataToWindow()
{
   wxSlider *slider;

   slider = GetFreqSlider();
   if (slider)
      slider->SetValue((int)(freq * 10));

   slider = GetFreqOffSlider();
   if (slider)
      slider->SetValue((int)freqoff);

   slider = GetDepthSlider();
   if (slider)
      slider->SetValue((int)depth);

   slider = GetPhaseSlider();
   if (slider)
      slider->SetValue((int)startphase);

   slider = GetResonanceSlider();
   if (slider)
      slider->SetValue((int)(res * 10));

   wxTextCtrl *text = GetFreqText();
   if (text) {
      wxString str;
      str.Printf("%.1f", freq);
      text->SetValue(str);
   }

   text = GetFreqOffText();
   if (text) {
      wxString str;
      str.Printf("%d", (int) freqoff);
      text->SetValue(str);
   }

   text = GetPhaseText();
   if (text) {
      wxString str;
      str.Printf("%d", (int) startphase);
      text->SetValue(str);
   }

   text = GetDepthText();
   if (text) {
      wxString str;
      str.Printf("%d", (int) depth);
      text->SetValue(str);
   }

   text = GetResonanceText();
   if (text) {
      wxString str;
      str.Printf("%.1f", res);
      text->SetValue(str);
   }

   return TRUE;
}

bool WahwahDialog::TransferDataFromWindow()
{
   wxTextCtrl *c;
   long x;

   c = GetFreqText();
   if (c) {
      double d;
      c->GetValue().ToDouble(&d);
      freq = TrapDouble(d * 10, FREQ_MIN, FREQ_MAX) / 10;
   }

   c = GetFreqOffText();
   if (c) {
      double d;
      c->GetValue().ToDouble(&d);
      freqoff = TrapDouble(d, FREQOFF_MIN, FREQOFF_MAX);
   }

   c = GetPhaseText();
   if (c) {
      c->GetValue().ToLong(&x);
      startphase = TrapLong(x, PHASE_MIN, PHASE_MAX);
   }

   c = GetDepthText();
   if (c) {
      c->GetValue().ToLong(&x);
      depth = TrapLong(x, DEPTH_MIN, DEPTH_MAX);
   }

   c = GetResonanceText();
   if (c) {
      double d;
      c->GetValue().ToDouble(&d);
      res = TrapDouble(d * 10, RES_MIN, RES_MAX) / 10;
   }

   return TRUE;
}

// WDR: handler implementations for WahwahDialog

void WahwahDialog::OnResonanceSlider(wxCommandEvent & event)
{
   wxString str;
   long res = GetResonanceSlider()->GetValue();
   str.Printf("%.1f", res / 10.0);
   GetResonanceText()->SetValue(str);
}

void WahwahDialog::OnDepthSlider(wxCommandEvent & event)
{
   wxString str;
   long depth = GetDepthSlider()->GetValue();
   str.Printf("%ld", depth);
   GetDepthText()->SetValue(str);
}

void WahwahDialog::OnPhaseSlider(wxCommandEvent & event)
{
   wxString str;
   long phase = GetPhaseSlider()->GetValue();
   phase = ((phase + 5) / 10) * 10;     // round to nearest multiple of 10
   str.Printf("%ld", phase);
   GetPhaseText()->SetValue(str);
}

void WahwahDialog::OnFreqSlider(wxCommandEvent & event)
{
   wxString str;
   long freql = GetFreqSlider()->GetValue();
   str.Printf("%.1f", freql / 10.0);
   GetFreqText()->SetValue(str);
}

void WahwahDialog::OnFreqOffSlider(wxCommandEvent & event)
{
   wxString str;
   long freqoff = GetFreqOffSlider()->GetValue();
   str.Printf("%d", (int) freqoff);
   GetFreqOffText()->SetValue(str);
}

void WahwahDialog::OnResonanceText(wxCommandEvent & event)
{
   wxTextCtrl *c = GetResonanceText();
   if (c) {
      double resd;
      c->GetValue().ToDouble(&resd);

      res = resd;
      res = TrapDouble(resd * 10, RES_MIN, RES_MAX) / 10.0;

      wxSlider *slider = GetResonanceSlider();
      if (slider)
         slider->SetValue((int)(res * 10));
   }
}

void WahwahDialog::OnDepthText(wxCommandEvent & event)
{
   wxTextCtrl *c = GetDepthText();
   if (c) {
      long depth;

      c->GetValue().ToLong(&depth);
      depth = TrapLong(depth, DEPTH_MIN, DEPTH_MAX);

      wxSlider *slider = GetDepthSlider();
      if (slider)
         slider->SetValue(depth);
   }
}

void WahwahDialog::OnPhaseText(wxCommandEvent & event)
{
   wxTextCtrl *c = GetPhaseText();
   if (c) {
      long phase;

      c->GetValue().ToLong(&phase);
      phase = TrapLong(phase, PHASE_MIN, PHASE_MAX);

      wxSlider *slider = GetPhaseSlider();
      if (slider)
         slider->SetValue(phase);
   }
}

void WahwahDialog::OnFreqText(wxCommandEvent & event)
{
   wxTextCtrl *c = GetFreqText();
   if (c) {
      long freql;
      double freqd;
      c->GetValue().ToDouble(&freqd);

      freq = freqd;
      freql = TrapLong(((long) (freq * 10)), FREQ_MIN, FREQ_MAX);

      wxSlider *slider = GetFreqSlider();
      if (slider)
         slider->SetValue(freql);
   }
}

void WahwahDialog::OnFreqOffText(wxCommandEvent & event)
{
   wxTextCtrl *c = GetFreqOffText();
   if (c) {
      double freqoff;
      c->GetValue().ToDouble(&freqoff);
      freqoff = TrapDouble(freqoff, FREQOFF_MIN, FREQOFF_MAX);

      wxSlider *slider = GetFreqOffSlider();
      if (slider)
         slider->SetValue((int)freqoff);
   }
}

void WahwahDialog::OnPreview(wxCommandEvent &event)
{
   TransferDataFromWindow();

	// Save & restore parameters around Preview, because we didn't do OK.
   float old_freq = m_pEffect->freq;
   float old_freqofs = m_pEffect->freqofs;
	float old_startphase = m_pEffect->startphase;
   float old_res = m_pEffect->res;
   float old_depth = m_pEffect->depth;
   
   m_pEffect->freq = freq;
   m_pEffect->freqofs = freqoff / 100;
   m_pEffect->startphase = startphase * M_PI / 180;
   m_pEffect->res = res;
   m_pEffect->depth = depth / 100;

   m_pEffect->Preview();

   m_pEffect->freq = old_freq;
   m_pEffect->freqofs = old_freqofs;
   m_pEffect->startphase = old_startphase;
   m_pEffect->res = old_res;
   m_pEffect->depth = old_depth;
}

void WahwahDialog::OnOk(wxCommandEvent & event)
{
   TransferDataFromWindow();

   if (Validate())
      EndModal(true);
   else {
      event.Skip();
   }
}

void WahwahDialog::OnCancel(wxCommandEvent & event)
{
   EndModal(false);
}

// Implement window functions

wxSizer *CreateWahwahDialog(wxWindow * parent, bool call_fit,
                            bool set_sizer)
{
   wxBoxSizer *item0 = new wxBoxSizer(wxVERTICAL);

   wxStaticText *item1 =
       new wxStaticText(parent, -1, _("Wahwah by Nasca Octavian Paul"),
                        wxDefaultPosition, wxDefaultSize, 0);
   item0->Add(item1, 0, wxALIGN_CENTRE | wxALL, 5);

   wxFlexGridSizer *item10 = new wxFlexGridSizer(3, 0, 0);

   wxStaticText *item11 =
       new wxStaticText(parent, -1, _("LFO Frequency (Hz):"),
                        wxDefaultPosition, wxDefaultSize, 0);
   item10->Add(item11, 0, wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL | wxALL,
               5);

   wxTextCtrl *item12 =
       new wxTextCtrl(parent, ID_FREQTEXT, "", wxDefaultPosition,
                      wxSize(40, -1), 0);
   item10->Add(item12, 0, wxALIGN_CENTRE | wxALL, 5);

   wxSlider *item13 =
       new wxSlider(parent, ID_FREQSLIDER, 100, FREQ_MIN, FREQ_MAX,
                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   item10->Add(item13, 0, wxALIGN_CENTRE | wxALL, 5);

   wxStaticText *item14 =
       new wxStaticText(parent, -1, _("LFO Start Phase (deg.):"),
                        wxDefaultPosition, wxDefaultSize, 0);
   item10->Add(item14, 0, wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL | wxALL,
               5);

   wxTextCtrl *item15 =
       new wxTextCtrl(parent, ID_PHASETEXT, "", wxDefaultPosition,
                      wxSize(40, -1), 0);
   item10->Add(item15, 0, wxALIGN_CENTRE | wxALL, 5);

   wxSlider *item16 =
       new wxSlider(parent, ID_PHASESLIDER, 0, PHASE_MIN, PHASE_MAX,
                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   item10->Add(item16, 0, wxALIGN_CENTRE | wxALL, 5);

   wxStaticText *item17 =
       new wxStaticText(parent, -1, _("Depth (%):"), wxDefaultPosition,
                        wxDefaultSize, wxALIGN_RIGHT);
   item10->Add(item17, 0, wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL | wxALL,
               5);

   wxTextCtrl *item18 =
       new wxTextCtrl(parent, ID_DEPTHTEXT, "", wxDefaultPosition,
                      wxSize(40, -1), 0);
   item10->Add(item18, 0, wxALIGN_CENTRE | wxALL, 5);

   wxSlider *item19 =
       new wxSlider(parent, ID_DEPTHSLIDER, 0, DEPTH_MIN, DEPTH_MAX,
                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   item10->Add(item19, 0, wxALIGN_CENTRE | wxALL, 5);

   wxStaticText *item20 =
       new wxStaticText(parent, -1, _("Resonance:"), wxDefaultPosition,
                        wxDefaultSize, wxALIGN_RIGHT);
   item10->Add(item20, 0, wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL | wxALL,
               5);

   wxTextCtrl *item21 =
       new wxTextCtrl(parent, ID_RESONANCETEXT, "", wxDefaultPosition,
                      wxSize(40, -1), 0);
   item10->Add(item21, 0, wxALIGN_CENTRE | wxALL, 5);

   wxSlider *item22 =
       new wxSlider(parent, ID_RESONANCESLIDER, 0, RES_MIN, RES_MAX,
                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   item10->Add(item22, 0, wxALIGN_CENTRE | wxALL, 5);

   wxStaticText *item30 =
       new wxStaticText(parent, -1, _("Wah Frequency Offset (%):"),
                        wxDefaultPosition, wxDefaultSize, wxALIGN_RIGHT);
   item10->Add(item30, 0, wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL | wxALL,
               5);

   wxTextCtrl *item31 =
       new wxTextCtrl(parent, ID_FREQOFFTEXT, "", wxDefaultPosition,
                      wxSize(40, -1), 0);
   item10->Add(item31, 0, wxALIGN_CENTRE | wxALL, 5);

   wxSlider *item32 =
       new wxSlider(parent, ID_FREQOFFSLIDER, 0, FREQOFF_MIN, FREQOFF_MAX,
                    wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   item10->Add(item32, 0, wxALIGN_CENTRE | wxALL, 5);

   item0->Add(item10, 0, wxALIGN_CENTRE | wxALL, 5);

   wxBoxSizer *item23 = new wxBoxSizer(wxHORIZONTAL);

   wxButton * pButton_Preview = 
		new wxButton(parent, ID_BUTTON_PREVIEW, 
							_("Preview")); //v Should be m_pEffect->GetPreviewName().
   item23->Add(pButton_Preview, 0, wxALIGN_CENTER | wxALL, 5);
   item23->Add(20, 10); // horizontal spacer

   wxButton *item25 =
       new wxButton(parent, wxID_CANCEL, _("Cancel"), wxDefaultPosition,
                    wxDefaultSize, 0);
   item23->Add(item25, 0, wxALIGN_CENTRE | wxALL, 5);

   wxButton *item24 =
       new wxButton(parent, wxID_OK, _("OK"), wxDefaultPosition,
                    wxDefaultSize, 0);
   item24->SetDefault();
   item24->SetFocus();
   item23->Add(item24, 0, wxALIGN_CENTRE | wxALL, 5);

   item0->Add(item23, 0, wxALIGN_CENTRE | wxALL, 5);

   if (set_sizer) {
      parent->SetAutoLayout(TRUE);
      parent->SetSizer(item0);
      if (call_fit) {
         item0->Fit(parent);
         item0->SetSizeHints(parent);
      }
   }

   return item0;
}