/*
    Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/** @file  src/types.h
 *  @brief Miscellaneous types.
 */

#ifndef LIBDCP_TYPES_H
#define LIBDCP_TYPES_H

#include <boost/shared_ptr.hpp>
#include <boost/function.hpp>
#include <string>

namespace dcp {

/** @struct Size
 *  @brief The integer, two-dimensional size of something.
 */
struct Size
{
	Size ()
		: width (0)
		, height (0)
	{}

	Size (int w, int h)
		: width (w)
		, height (h)
	{}

	float ratio () const {
		return float (width) / height;
	}

	int width;
	int height;
};

/** Identifier for a sound channel */
enum Channel {
	LEFT = 0,      ///< left
	RIGHT = 1,     ///< right
	CENTRE = 2,    ///< centre
	LFE = 3,       ///< low-frequency effects (sub)
	LS = 4,        ///< left surround
	RS = 5,        ///< right surround
	HI = 6,
	VI = 7,
	LC = 8,
	RC = 9,
	BSL = 10,
	BSR = 11
};

enum ContentKind
{
	FEATURE,
	SHORT,
	TRAILER,
	TEST,
	TRANSITIONAL,
	RATING,
	TEASER,
	POLICY,
	PUBLIC_SERVICE_ANNOUNCEMENT,
	ADVERTISEMENT
};

enum Effect
{
	NONE,
	BORDER,
	SHADOW
};

extern std::string effect_to_string (Effect e);
extern Effect string_to_effect (std::string s);

enum HAlign
{
	HALIGN_LEFT,   ///< horizontal position is distance from left of screen to left of subtitle
	HALIGN_CENTER, ///< horizontal position is distance from centre of screen to centre of subtitle
	HALIGN_RIGHT,  ///< horizontal position is distance from right of screen to right of subtitle
};

extern std::string halign_to_string (HAlign a);
extern HAlign string_to_halign (std::string s);

enum VAlign
{
	VALIGN_TOP,    ///< vertical position is distance from top of screen to top of subtitle
	VALIGN_CENTER, ///< vertical position is distance from centre of screen to centre of subtitle
	VALIGN_BOTTOM  ///< vertical position is distance from bottom of screen to bottom of subtitle
};

extern std::string valign_to_string (VAlign a);
extern VAlign string_to_valign (std::string s);

enum Eye
{
	EYE_LEFT,
	EYE_RIGHT
};

/** @class Fraction
 *  @brief A fraction (i.e. a thing with an integer numerator and an integer denominator).
 */
class Fraction
{
public:
	/** Construct a fraction of 0/0 */
	Fraction () : numerator (0), denominator (0) {}
	Fraction (std::string s);
	/** Construct a fraction with a specified numerator and denominator.
	 *  @param n Numerator.
	 *  @param d Denominator.
	 */
	Fraction (int n, int d) : numerator (n), denominator (d) {}

	float as_float () const {
		return float (numerator) / denominator;
	}

	std::string as_string () const;

	int numerator;
	int denominator;
};

extern bool operator== (Fraction const & a, Fraction const & b);
extern bool operator!= (Fraction const & a, Fraction const & b);
extern std::ostream& operator<< (std::ostream& s, Fraction const & f);

/** @struct EqualityOptions
 *  @brief  A class to describe what "equality" means for a particular test.
 *
 *  When comparing things, we want to be able to ignore some differences;
 *  this class expresses those differences.
 */
struct EqualityOptions
{
	/** Construct an EqualityOptions where nothing at all can differ */
	EqualityOptions ()
		: max_mean_pixel_error (0)
		, max_std_dev_pixel_error (0)
		, max_audio_sample_error (0)
		, cpl_annotation_texts_can_differ (false)
		, reel_annotation_texts_can_differ (false)
		, reel_hashes_can_differ (false)
		, issue_dates_can_differ (false)
		, keep_going (false)
	{}

	/** The maximum allowable mean difference in pixel value between two images */
	double max_mean_pixel_error;
	/** The maximum standard deviation of the differences in pixel value between two images */
	double max_std_dev_pixel_error;
	/** The maximum difference in audio sample value between two soundtracks */
	int max_audio_sample_error;
	/** true if the &lt;AnnotationText&gt; nodes of CPLs are allowed to differ */
	bool cpl_annotation_texts_can_differ;
	/** true if the &lt;AnnotationText&gt; nodes of Reels are allowed to differ */
	bool reel_annotation_texts_can_differ;
	/** true if <Hash>es in Reels can differ */
	bool reel_hashes_can_differ;
	/** true if IssueDate nodes can differ */
	bool issue_dates_can_differ;
	bool keep_going;
};

/* I've been unable to make mingw happy with ERROR as a symbol, so
   I'm using a DCP_ prefix here.
*/
enum NoteType {
	DCP_PROGRESS,
	DCP_ERROR,
	DCP_NOTE
};

enum Standard {
	DCP_INTEROP,
	DCP_SMPTE,
	IMP
};

enum Formulation {
	MODIFIED_TRANSITIONAL_1,
	DCI_ANY,
	DCI_SPECIFIC
};

/** @class Colour
 *  @brief An RGB colour.
 */
class Colour
{
public:
	Colour ();
	Colour (int r_, int g_, int b_);
	Colour (std::string argb_hex);

	int r; ///< red component, from 0 to 255
	int g; ///< green component, from 0 to 255
	int b; ///< blue component, from 0 to 255

	std::string to_argb_string () const;
};

extern bool operator== (Colour const & a, Colour const & b);
extern bool operator!= (Colour const & a, Colour const & b);
extern std::ostream & operator<< (std::ostream & s, Colour const & c);

typedef boost::function<void (NoteType, std::string)> NoteHandler;

/** Maximum absolute difference between dcp::SubtitleString::aspect_adjust values that
 *  are considered equal.
 */
const float ASPECT_ADJUST_EPSILON = 1e-3;

/** Maximum absolute difference between dcp::SubtitleString alignment values that
 *  are considered equal.
 */
const float ALIGN_EPSILON = 1e-3;

}

#endif