/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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.
 * 
 *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _THRESHOLDSELECTOR_
#define _THRESHOLDSELECTOR_

#include "guiutils.h"
#include "../rtengine/procparams.h"
#include "coloredbar.h"
#include <iomanip>

class ThresholdSelector;

/*
 * This class let the instanciator to provide the background curve
 */
class ThresholdCurveProvider {
	public:
		virtual ~ThresholdCurveProvider() {};
		/*
		 * The curve provider has to send back a list of point (at least 2 points) in the [0.0 ; 1.0] range
		 * for both X and Y axis; X and Y values are streamlined ( X1, Y1, X2, Y2, X3, Y3, ...)
		 */
		virtual std::vector<double> getCurvePoints(ThresholdSelector* tAdjuster) const = 0;
};

/*
 * This widget will let you select a linearly variable threshold, creating a ramp up
 * if you want to go from a null effect to a full effect
 *    0-0-ramp up-1-1
 * or a ramp down if you want the contrary
 *    1-1-ramp down-0-0
 *
 * You can optionally create a double threshold
 *    0-0-ramp up-1-1-ramp down-0-0
 * or
 *    1-1-ramp down-0-0-ramp up-1-1
 *
 * Please note that the values are related to the cursors, depending on their position
 * on the graph. E.g. the "bottomLeft" value is related to the bottom left cursor.
 *
 * It is also possible to have a threshold with 2 totally independent cursors, each one having his own range,
 * man/max/default values and precision. This let developers create their own threshold curve, that they will
 * have to provide through the
 *
 */
class ThresholdSelector : public Gtk::DrawingArea, public ColoredBar {

	public:

		enum ThreshCursorId {
			TS_UNDEFINED=-1,
			TS_BOTTOMLEFT,
			TS_TOPLEFT,
			TS_BOTTOMRIGHT,
			TS_TOPRIGHT
		};


	protected:

		sigc::signal<void> sig_val_changed;

		ThresholdCurveProvider* bgCurveProvider;

		Glib::ustring additionalTTip;
		Glib::ustring separatedLabelBottom;  // Label for the bottom cursor, displayed if separatedSliders==true only
		Glib::ustring separatedLabelTop;     // Label for the top cursor, displayed if separatedSliders==true only
		bool separatedSliders; // If true, the Top and Bottom sliders are totally separate and can be drag through the full range; for simple threshold only!
		bool doubleThresh;  // If true: there curve is a double threshold (0 to 1 to 0, or 1 to 0 to 1).
		bool initalEq1;     // If true: the curve start at 1 (top); if false: the curve start at 0 (bottom)
		unsigned int precisionTop;     // Decimal number if this object has to handle "double" values, for the Top slider
		unsigned int precisionBottom;  // Decimal number if this object has to handle "double" values, for the Bottom slider
		ThreshCursorId litCursor;
		ThreshCursorId oldLitCursor;
		double boundary1[2], boundary2[2];
		double tmpX, tmpPos;

		ThreshCursorId movedCursor, secondaryMovedCursor;
		double minValTop, maxValTop;
		double minValBottom, maxValBottom;
		double defPos[4];
		double positions[4];
		unsigned short wslider;

		const static int hb = 3;  // horizontal border
		const static int vb = 2;  // vertical border

		void initValues ();
		void findLitCursor(int posX, int posY);
		void findSecondaryMovedCursor(guint state);
		void findBoundaries(double &min, double &max);
		double to01(ThreshCursorId cursorId);
		void updateTooltip();

	public:

		sigc::signal<void> signal_value_changed();

		ThresholdSelector(double minValueBottom, double maxValueBottom, double defBottom, Glib::ustring labelBottom, unsigned int precisionBottom,
		                  double minValueTop,    double maxValueTop,    double defTop,    Glib::ustring labelTop,    unsigned int precisionTop,
		                  ThresholdCurveProvider* curveProvider);
		ThresholdSelector(double minValue, double maxValue, double defBottom, double defTop, unsigned int precision, bool startAtOne);
		ThresholdSelector(double minValue, double maxValue, double defBottomLeft, double defTopLeft, double defBottomRight, double defTopRight, unsigned int precision, bool startAtOne);

		double shapePositionValue (ThreshCursorId cursorId);
		template <typename T>
		void setDefaults (const rtengine::procparams::Threshold<T> &t) {
			defPos[TS_BOTTOMLEFT] = double(t.value[0]);  // should we use shapeValue() ?
			defPos[TS_TOPLEFT]    = double(t.value[1]);
			if (doubleThresh) {
				defPos[TS_BOTTOMRIGHT] = double(t.value[2]);
				defPos[TS_TOPRIGHT]    = double(t.value[3]);
			}
		}
		void setDefaults (double bottom, double top);
		void setDefaults (double bottomLeft, double topLeft, double bottomRight, double topRight);
		template <typename T>
		void setPositions (const rtengine::procparams::Threshold<T> &tValues) {
			positions[TS_BOTTOMLEFT]  = static_cast<double>(tValues.value[TS_BOTTOMLEFT]);
			positions[TS_TOPLEFT]     = static_cast<double>(tValues.value[TS_TOPLEFT]);
			if (tValues.isDouble()) {
				positions[TS_BOTTOMRIGHT] = static_cast<double>(tValues.value[TS_BOTTOMRIGHT]);
				positions[TS_TOPRIGHT]    = static_cast<double>(tValues.value[TS_TOPRIGHT]);
			}
			updateTooltip();
			queue_draw();
		}
		void setPositions (double bottom, double top);
		void setPositions (double bottomLeft, double topLeft, double bottomRight, double topRight);

		template <typename T>
		rtengine::procparams::Threshold<T> getPositions () {
			if (doubleThresh) {
				rtengine::procparams::Threshold<T> rThresh(
						static_cast<T>(shapePositionValue(TS_BOTTOMLEFT)),
						static_cast<T>(shapePositionValue(TS_TOPLEFT)),
						static_cast<T>(shapePositionValue(TS_BOTTOMRIGHT)),
						static_cast<T>(shapePositionValue(TS_TOPRIGHT)),
						initalEq1
				);
				return rThresh;
			}
			else {
				rtengine::procparams::Threshold<T> rThresh(
						static_cast<T>(shapePositionValue(TS_BOTTOMLEFT)),
						static_cast<T>(shapePositionValue(TS_TOPLEFT)),
						initalEq1
				);
				return rThresh;
			}
		}

		template <typename T>
		void getPositions (T &bottom, T &top) {
			bottom = static_cast<T>(shapePositionValue(TS_BOTTOMLEFT));
			top    = static_cast<T>(shapePositionValue(TS_TOPLEFT));
		}

		template <typename T>
		void getPositions (T &bottomLeft, T &topLeft, T &bottomRight, T &topRight) {
			bottomLeft  = static_cast<T>(shapePositionValue(TS_BOTTOMLEFT));
			topLeft     = static_cast<T>(shapePositionValue(TS_TOPLEFT));
			bottomRight = static_cast<T>(shapePositionValue(TS_BOTTOMRIGHT));
			topRight    = static_cast<T>(shapePositionValue(TS_TOPRIGHT));
		}

		void setSeparatedSliders(bool separated);
		bool getSeparatedSliders();
		void setBgCurveProvider (ThresholdCurveProvider* provider);
		bool isStartAtOne() { return initalEq1; }
		bool isDouble() { return doubleThresh; }
		void on_realize ();
		bool on_expose_event(GdkEventExpose* event);
		bool on_button_press_event (GdkEventButton* event);
		bool on_button_release_event (GdkEventButton* event);
		bool on_motion_notify_event (GdkEventMotion* event);
		bool on_leave_notify_event (GdkEventCrossing* event);
		void styleChanged (const Glib::RefPtr<Gtk::Style>& style);
		unsigned int getPrecision () { return precisionTop; }
		void reset ();
		void set_tooltip_markup(const Glib::ustring& markup);
		// this set_tooltip_text method is to set_tooltip_markup, and text can contain markups
		void set_tooltip_text(const Glib::ustring& text);
};

template<>
inline void ThresholdSelector::getPositions<Glib::ustring> (Glib::ustring& bottom, Glib::ustring& top) {
	bottom = Glib::ustring::format(std::fixed, std::setprecision(precisionBottom), shapePositionValue(TS_BOTTOMLEFT));
	top    = Glib::ustring::format(std::fixed, std::setprecision(precisionTop),    shapePositionValue(TS_TOPLEFT));
}

template<>
inline void ThresholdSelector::getPositions<Glib::ustring> (Glib::ustring& bottomLeft, Glib::ustring& topLeft, Glib::ustring& bottomRight, Glib::ustring& topRight) {

	bottomLeft  = Glib::ustring::format(std::fixed, std::setprecision(precisionBottom), shapePositionValue(TS_BOTTOMLEFT));
	topLeft     = Glib::ustring::format(std::fixed, std::setprecision(precisionTop),    shapePositionValue(TS_TOPLEFT));
	bottomRight = Glib::ustring::format(std::fixed, std::setprecision(precisionBottom), shapePositionValue(TS_BOTTOMRIGHT));
	topRight    = Glib::ustring::format(std::fixed, std::setprecision(precisionTop),    shapePositionValue(TS_TOPRIGHT));
}

#endif

