/*
 * Author: Harry van Haaren 2013
 *         harryhaaren@gmail.com
 * 
 *  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/>.
 */


#ifndef AVTK_REVERB_H
#define AVTK_REVERB_H

#include <FL/Fl_Slider.H>

namespace Avtk
{

class Reverb : public Fl_Slider
{
  public:
    Reverb(int _x, int _y, int _w, int _h, const char *_label =0):
        Fl_Slider(_x, _y, _w, _h, _label)
    {
      x = _x;
      y = _y;
      w = _w;
      h = _h;
      
      amp = 0.5;
      s   = 0.5;
      damp= 0.5;
      
      active = false;
      
      label = _label;
      
      highlight = false;
      mouseOver = false;
    }
    
    void size(float v) { s = v; redraw(); }
    void wet(float v) { amp = v; redraw(); }
    void damping(float v){damp = v; redraw();}
    
    float size(){return s;}
    float wet (){return amp;}
    float damping(){return damp;}
    
    bool getActive(){return active;}
    void setActive(bool a){active = a; redraw();}
    
    float s;
    float amp;
    float damp;
    
    bool active;
    
    bool mouseOver;
    bool highlight;
    int x, y, w, h;
    const char* label;
    
    void draw()
    {
      if (damage() & FL_DAMAGE_ALL)
      {
        cairo_t *cr = Fl::cairo_cc();
        
        cairo_save( cr );
        
        // graph
        cairo_rectangle( cr, x, y, w, h );
        cairo_set_source_rgb( cr,28 / 255.f,  28 / 255.f ,  28 / 255.f  );
        cairo_fill(cr);
        
        
        // set up dashed lines, 1 px off, 1 px on
        double dashes[1];
        dashes[0] = 2.0;
        
        cairo_set_dash ( cr, dashes, 1, 0.0);
        
        // loop over each 2nd line, drawing dots
        cairo_set_line_width(cr, 1.0);
        cairo_set_source_rgb(cr, 0.4,0.4,0.4);
        for ( int i = 0; i < 4; i++ )
        {
          cairo_move_to( cr, x + ((w / 4.f)*i), y );
          cairo_line_to( cr, x + ((w / 4.f)*i), y + h );
        }
        for ( int i = 0; i < 4; i++ )
        {
          cairo_move_to( cr, x    , y + ((h / 4.f)*i) );
          cairo_line_to( cr, x + w, y + ((h / 4.f)*i) );
        }
        cairo_set_source_rgba( cr,  66 / 255.f,  66 / 255.f ,  66 / 255.f , 0.5 );
        cairo_stroke(cr);
        cairo_set_dash ( cr, dashes, 0, 0.0);
        
        // draw "damping" control
        cairo_move_to( cr, x+w*0.1              , y + h*0.85 - (h*0.7*amp));
        cairo_line_to( cr, x+w*0.1 + (w-20)*damp, y + h*0.85 - (h*0.7*amp));
        cairo_set_source_rgba(cr, 1.0, 0.48,   0,  1);
        cairo_set_line_join( cr, CAIRO_LINE_JOIN_ROUND);
        cairo_set_line_cap ( cr, CAIRO_LINE_CAP_ROUND);
        cairo_set_line_width(cr, 1.9);
        cairo_stroke( cr );
        
        // draw reverb triangle
        cairo_move_to( cr, x , y + h*0.99 );
        cairo_line_to( cr, x + w*0.1, y + h*0.85 - (h*0.7*amp));
        cairo_line_to( cr, x + w*0.3+w*0.7*s, y + (h*0.99));
        
        // stroke
        cairo_set_source_rgba( cr, 0 / 255.f, 153 / 255.f , 255 / 255.f , 0.21 );
        cairo_fill_preserve(cr);
        cairo_set_source_rgba( cr, 0 / 255.f, 153 / 255.f , 255 / 255.f , 1 );
        cairo_set_line_width(cr, 1.2);
        cairo_stroke( cr );
        
        // stroke rim
        cairo_rectangle(cr, x, y, w, h);
        //cairo_set_source_rgba( cr, 0 / 255.f, 153 / 255.f , 255 / 255.f , 1 );
        cairo_set_source_rgba( cr,  126 / 255.f,  126 / 255.f ,  126 / 255.f , 0.8 );
        cairo_set_line_width(cr, 0.9);
        cairo_stroke( cr );
        
        if ( !active )
        {
          // big grey X
          cairo_set_line_width(cr, 12.0);
          cairo_set_source_rgba(cr, 0.0,0.0,0.0, 1.0);
          
          cairo_move_to( cr, x + (3 * w / 4.f), y + ( h / 4.f ) );
          cairo_line_to( cr, x + (w / 4.f), y + ( 3 *h / 4.f ) );
          
          cairo_move_to( cr, x + (w / 4.f), y + ( h / 4.f ) );
          cairo_line_to( cr, x + (3 * w / 4.f), y + ( 3 *h / 4.f ) );
          cairo_set_line_cap ( cr, CAIRO_LINE_CAP_BUTT);
          cairo_stroke( cr );
        }
        
        cairo_restore( cr );
        
        draw_label();
      }
    }
    
    void resize(int X, int Y, int W, int H)
    {
      Fl_Widget::resize(X,Y,W,H);
      x = X;
      y = Y;
      w = W;
      h = H;
      redraw();
    }
    
    int handle(int event)
    {
      switch(event) {
        case FL_PUSH:
          highlight = 1;
          if ( Fl::event_button() == FL_RIGHT_MOUSE )
          {
            active = !active;
            redraw();
            do_callback();
          }
          return 1;
        case FL_DRAG: {
            int t = Fl::event_inside(this);
            if (t != highlight) {
              highlight = t;
              redraw();
            }
          }
          return 1;
        case FL_ENTER:
          mouseOver = true;
          redraw();
          return 1;
        case FL_LEAVE:
          mouseOver = false;
          redraw();
          return 1;
        case FL_RELEASE:
          if (highlight) {
            highlight = 0;
            redraw();
          }
          return 1;
        case FL_SHORTCUT:
          if ( test_shortcut() )
          {
            do_callback();
            return 1;
          }
          return 0;
        default:
          return Fl_Widget::handle(event);
      }
    }
};

} // Avtk

#endif // AVTK_ADSR_H