#ifndef __gtk_ardour_xfade_edit_h__
#define __gtk_ardour_xfade_edit_h__

#include <list>

#include <gtkmm/box.h>
#include <gtkmm/button.h>
#include <gtkmm/radiobutton.h>

#include <ardour/curve.h>
#include "ardour_dialog.h"
#include "canvas.h"

namespace ARDOUR
{
	class Session;
	class Curve;
	class Crossfade;
}

class CrossfadeEditor : public ArdourDialog
{
  public:
	CrossfadeEditor (ARDOUR::Session&, boost::shared_ptr<ARDOUR::Crossfade>, double miny, double maxy);
	~CrossfadeEditor ();
	
	void apply ();
	
	static const double canvas_border;
	
	/* these are public so that a caller/subclass can make them do the right thing.
	 */
	
	Gtk::Button* cancel_button;
	Gtk::Button* ok_button;
	
	struct PresetPoint {
	    double x;
	    double y;
	    
	    PresetPoint (double a, double b) 
		    : x (a), y (b) {}
	};
	
	struct Preset : public list<PresetPoint> {
	    const char* image_name;
	    
	    Preset (const char* x) : image_name (x) {}
	};
	
	typedef list<Preset*> Presets;
	
	static Presets* fade_in_presets;
	static Presets* fade_out_presets;
	
  private:
	boost::shared_ptr<ARDOUR::Crossfade> xfade;
	ARDOUR::Session& session;
	
	Gtk::VBox vpacker;
	
	struct Point {
	    ~Point();
	    
	    ArdourCanvas::SimpleRect* box;
	    ArdourCanvas::Line* curve;
	    double x;
	    double y;
	    
	    static const int32_t size;
	    
	    void move_to (double x, double y, double xfract, double yfract);
	};
	
	struct PointSorter 
	{
	    bool operator() (const CrossfadeEditor::Point* a, const CrossfadeEditor::Point *b) {
		    return a->x < b->x;
	    }
	};
	
	ArdourCanvas::SimpleRect*   toplevel;
	ArdourCanvas::Canvas* canvas;
	
	struct Half {
	    ArdourCanvas::Line*     line;
	    ArdourCanvas::Polygon*  shading;
	    list<Point*>            points;
	    ARDOUR::Curve           normative_curve; /* 0 - 1.0, linear */
	    ARDOUR::Curve           gain_curve;      /* 0 - 2.0, gain mapping */
	    vector<ArdourCanvas::WaveView*>  waves;
	    
	    Half();
	};
	
	enum WhichFade {
		In = 0,
		Out = 1
	};
	
	Half fade[2];
	WhichFade current;
	
	bool point_grabbed;
	vector<Gtk::Button*> fade_out_buttons;
	vector<Gtk::Button*> fade_in_buttons;

	Gtk::VBox vpacker2;

	Gtk::Button clear_button;
	Gtk::Button revert_button;

	Gtk::ToggleButton audition_both_button;
	Gtk::ToggleButton audition_left_dry_button;
	Gtk::ToggleButton audition_left_button;
	Gtk::ToggleButton audition_right_dry_button;
	Gtk::ToggleButton audition_right_button;

	Gtk::ToggleButton preroll_button;
	Gtk::ToggleButton postroll_button;

	Gtk::HBox roll_box;

	gint event_handler (GdkEvent*);

	bool canvas_event (GdkEvent* event);
	bool point_event (GdkEvent* event, Point*);
	bool curve_event (GdkEvent* event);

	void canvas_allocation (Gtk::Allocation&);
	void add_control_point (double x, double y);
	Point* make_point ();
	void redraw ();
    
	double effective_width () const { return canvas->get_allocation().get_width() - (2.0 * canvas_border); }
	double effective_height () const { return canvas->get_allocation().get_height() - (2.0 * canvas_border); }

	void clear ();
	void reset ();

	double miny;
	double maxy;

	Gtk::Table fade_in_table;
	Gtk::Table fade_out_table;

	void build_presets ();
	void apply_preset (Preset*);
    
	Gtk::RadioButton select_in_button;
	Gtk::RadioButton select_out_button;
	Gtk::HBox   curve_button_box;
	Gtk::HBox   audition_box;

	void curve_select_clicked (WhichFade);

	double x_coordinate (double& xfract) const;
	double y_coordinate (double& yfract) const;
    
	void set (const ARDOUR::Curve& alist, WhichFade);

	sigc::connection peaks_ready_connection;

	void make_waves (boost::shared_ptr<ARDOUR::AudioRegion>, WhichFade);
	void peaks_ready (boost::shared_ptr<ARDOUR::AudioRegion> r, WhichFade);
    
	void _apply_to (boost::shared_ptr<ARDOUR::Crossfade> xf);
	void setup (boost::shared_ptr<ARDOUR::Crossfade>);
	void cancel_audition ();
	void audition_state_changed (bool);

	void audition_toggled ();
	void audition_right_toggled ();
	void audition_right_dry_toggled ();
	void audition_left_toggled ();
	void audition_left_dry_toggled ();

	void audition_both ();
	void audition_left_dry ();
	void audition_left ();
	void audition_right_dry ();
	void audition_right ();

	void xfade_changed (ARDOUR::Change);

	void dump ();
};

#endif /* __gtk_ardour_xfade_edit_h__ */