/*
    Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic 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.

    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/


#include "colour_conversion.h"
#include "config.h"
#include "digester.h"
#include "util.h"
#include <dcp/chromaticity.h>
#include <dcp/gamma_transfer_function.h>
#include <dcp/identity_transfer_function.h>
#include <dcp/modified_gamma_transfer_function.h>
#include <dcp/raw_convert.h>
#include <dcp/s_gamut3_transfer_function.h>
#include <dcp/warnings.h>
#include <libcxml/cxml.h>
LIBDCP_DISABLE_WARNINGS
#include <libxml++/libxml++.h>
LIBDCP_ENABLE_WARNINGS
#include <iostream>

#include "i18n.h"


using std::cout;
using std::dynamic_pointer_cast;
using std::list;
using std::make_shared;
using std::shared_ptr;
using std::string;
using std::vector;
using boost::optional;
using dcp::raw_convert;


vector<PresetColourConversion> PresetColourConversion::_presets;


ColourConversion::ColourConversion ()
	: dcp::ColourConversion (dcp::ColourConversion::srgb_to_xyz ())
{

}

ColourConversion::ColourConversion (dcp::ColourConversion conversion_)
	: dcp::ColourConversion (conversion_)
{

}

ColourConversion::ColourConversion (cxml::NodePtr node, int version)
{
	shared_ptr<dcp::TransferFunction> in;

	if (version >= 32) {

		/* Version 2.x */

		auto in_node = node->node_child ("InputTransferFunction");
		auto in_type = in_node->string_child ("Type");
		if (in_type == "Gamma") {
			_in = make_shared<dcp::GammaTransferFunction>(in_node->number_child<double> ("Gamma"));
		} else if (in_type == "ModifiedGamma") {
			_in = make_shared<dcp::ModifiedGammaTransferFunction>(
					   in_node->number_child<double>("Power"),
					   in_node->number_child<double>("Threshold"),
					   in_node->number_child<double>("A"),
					   in_node->number_child<double>("B")
					   );
		} else if (in_type == "SGamut3") {
			_in = make_shared<dcp::SGamut3TransferFunction>();
		}

	} else {

		/* Version 1.x */

		if (node->bool_child ("InputGammaLinearised")) {
			_in.reset (new dcp::ModifiedGammaTransferFunction (node->number_child<double> ("InputGamma"), 0.04045, 0.055, 12.92));
		} else {
			_in.reset (new dcp::GammaTransferFunction (node->number_child<double> ("InputGamma")));
		}
	}

	_yuv_to_rgb = static_cast<dcp::YUVToRGB>(node->optional_number_child<int>("YUVToRGB").get_value_or(static_cast<int>(dcp::YUVToRGB::REC601)));

	auto m = node->node_children ("Matrix");
	if (!m.empty ()) {
		/* Read in old <Matrix> nodes and convert them to chromaticities */
		boost::numeric::ublas::matrix<double> C (3, 3);
		for (auto i: m) {
			int const ti = i->number_attribute<int>("i");
			int const tj = i->number_attribute<int>("j");
			C(ti, tj) = raw_convert<double>(i->content());
		}

		double const rd = C(0, 0) + C(1, 0) + C(2, 0);
		_red = dcp::Chromaticity (C(0, 0) / rd, C(1, 0) / rd);
		double const gd = C(0, 1) + C(1, 1) + C(2, 1);
		_green = dcp::Chromaticity (C(0, 1) / gd, C(1, 1) / gd);
		double const bd = C(0, 2) + C(1, 2) + C(2, 2);
		_blue = dcp::Chromaticity (C(0, 2) / bd, C(1, 2) / bd);
		double const wd = C(0, 0) + C(0, 1) + C(0, 2) + C(1, 0) + C(1, 1) + C(1, 2) + C(2, 0) + C(2, 1) + C(2, 2);
		_white = dcp::Chromaticity ((C(0, 0) + C(0, 1) + C(0, 2)) / wd, (C(1, 0) + C(1, 1) + C(1, 2)) / wd);
	} else {
		/* New-style chromaticities */
		_red = dcp::Chromaticity (node->number_child<double> ("RedX"), node->number_child<double> ("RedY"));
		_green = dcp::Chromaticity (node->number_child<double> ("GreenX"), node->number_child<double> ("GreenY"));
		_blue = dcp::Chromaticity (node->number_child<double> ("BlueX"), node->number_child<double> ("BlueY"));
		_white = dcp::Chromaticity (node->number_child<double> ("WhiteX"), node->number_child<double> ("WhiteY"));
		if (node->optional_node_child ("AdjustedWhiteX")) {
			_adjusted_white = dcp::Chromaticity (
				node->number_child<double> ("AdjustedWhiteX"), node->number_child<double> ("AdjustedWhiteY")
				);
		}
	}

	auto gamma = node->optional_number_child<double>("OutputGamma");
	if (gamma) {
		_out = make_shared<dcp::GammaTransferFunction>(node->number_child<double>("OutputGamma"));
	} else {
		_out = make_shared<dcp::IdentityTransferFunction>();
	}
}

boost::optional<ColourConversion>
ColourConversion::from_xml (cxml::NodePtr node, int version)
{
	if (!node->optional_node_child ("InputTransferFunction")) {
		return boost::optional<ColourConversion> ();
	}

	return ColourConversion (node, version);
}

void
ColourConversion::as_xml (xmlpp::Node* node) const
{
	auto in_node = node->add_child ("InputTransferFunction");
	if (dynamic_pointer_cast<const dcp::GammaTransferFunction> (_in)) {
		auto tf = dynamic_pointer_cast<const dcp::GammaTransferFunction> (_in);
		in_node->add_child("Type")->add_child_text ("Gamma");
		in_node->add_child("Gamma")->add_child_text (raw_convert<string> (tf->gamma ()));
	} else if (dynamic_pointer_cast<const dcp::ModifiedGammaTransferFunction> (_in)) {
		auto tf = dynamic_pointer_cast<const dcp::ModifiedGammaTransferFunction> (_in);
		in_node->add_child("Type")->add_child_text ("ModifiedGamma");
		in_node->add_child("Power")->add_child_text (raw_convert<string> (tf->power ()));
		in_node->add_child("Threshold")->add_child_text (raw_convert<string> (tf->threshold ()));
		in_node->add_child("A")->add_child_text (raw_convert<string> (tf->A ()));
		in_node->add_child("B")->add_child_text (raw_convert<string> (tf->B ()));
	} else if (dynamic_pointer_cast<const dcp::SGamut3TransferFunction> (_in)) {
		in_node->add_child("Type")->add_child_text ("SGamut3");
	}

	node->add_child("YUVToRGB")->add_child_text (raw_convert<string> (static_cast<int> (_yuv_to_rgb)));
	node->add_child("RedX")->add_child_text (raw_convert<string> (_red.x));
	node->add_child("RedY")->add_child_text (raw_convert<string> (_red.y));
	node->add_child("GreenX")->add_child_text (raw_convert<string> (_green.x));
	node->add_child("GreenY")->add_child_text (raw_convert<string> (_green.y));
	node->add_child("BlueX")->add_child_text (raw_convert<string> (_blue.x));
	node->add_child("BlueY")->add_child_text (raw_convert<string> (_blue.y));
	node->add_child("WhiteX")->add_child_text (raw_convert<string> (_white.x));
	node->add_child("WhiteY")->add_child_text (raw_convert<string> (_white.y));
	if (_adjusted_white) {
		node->add_child("AdjustedWhiteX")->add_child_text (raw_convert<string> (_adjusted_white.get().x));
		node->add_child("AdjustedWhiteY")->add_child_text (raw_convert<string> (_adjusted_white.get().y));
	}

	if (dynamic_pointer_cast<const dcp::GammaTransferFunction> (_out)) {
		shared_ptr<const dcp::GammaTransferFunction> gf = dynamic_pointer_cast<const dcp::GammaTransferFunction> (_out);
		node->add_child("OutputGamma")->add_child_text (raw_convert<string> (gf->gamma ()));
	}
}

optional<size_t>
ColourConversion::preset () const
{
	auto presets = PresetColourConversion::all ();
	size_t i = 0;
	while (i < presets.size() && presets[i].conversion != *this) {
		++i;
	}

	if (i >= presets.size ()) {
		return {};
	}

	return i;
}

string
ColourConversion::identifier () const
{
	Digester digester;

	if (dynamic_pointer_cast<const dcp::GammaTransferFunction> (_in)) {
		shared_ptr<const dcp::GammaTransferFunction> tf = dynamic_pointer_cast<const dcp::GammaTransferFunction> (_in);
		digester.add (tf->gamma ());
	} else if (dynamic_pointer_cast<const dcp::ModifiedGammaTransferFunction> (_in)) {
		shared_ptr<const dcp::ModifiedGammaTransferFunction> tf = dynamic_pointer_cast<const dcp::ModifiedGammaTransferFunction> (_in);
		digester.add (tf->power ());
		digester.add (tf->threshold ());
		digester.add (tf->A ());
		digester.add (tf->B ());
	}

	digester.add (_red.x);
	digester.add (_red.y);
	digester.add (_green.x);
	digester.add (_green.y);
	digester.add (_blue.x);
	digester.add (_blue.y);
	digester.add (_white.x);
	digester.add (_white.y);

	if (_adjusted_white) {
		digester.add (_adjusted_white.get().x);
		digester.add (_adjusted_white.get().y);
	}

	auto gf = dynamic_pointer_cast<const dcp::GammaTransferFunction> (_out);
	if (gf) {
		digester.add (gf->gamma ());
	}

	return digester.get ();
}

PresetColourConversion::PresetColourConversion ()
	: name (_("Untitled"))
{

}

PresetColourConversion::PresetColourConversion (string n, string i, dcp::ColourConversion conversion_)
	: conversion (conversion_)
	, name (n)
	, id (i)
{

}

PresetColourConversion::PresetColourConversion (cxml::NodePtr node, int version)
	: conversion (node, version)
	, name (node->string_child ("Name"))
{

}

bool
operator== (ColourConversion const & a, ColourConversion const & b)
{
	return a.about_equal (b, 1e-6);
}

bool
operator!= (ColourConversion const & a, ColourConversion const & b)
{
	return !(a == b);
}

bool
operator== (PresetColourConversion const & a, PresetColourConversion const & b)
{
	return a.name == b.name && a.conversion == b.conversion;
}

void
PresetColourConversion::setup_colour_conversion_presets ()
{
	_presets.push_back (PresetColourConversion (_("sRGB"), "srgb", dcp::ColourConversion::srgb_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("Rec. 601"), "rec601", dcp::ColourConversion::rec601_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("Rec. 709"), "rec709", dcp::ColourConversion::rec709_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("P3"), "p3", dcp::ColourConversion::p3_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("Rec. 1886"), "rec1886", dcp::ColourConversion::rec1886_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("Rec. 2020"), "rec2020", dcp::ColourConversion::rec2020_to_xyz ()));
	_presets.push_back (PresetColourConversion (_("S-Gamut3/S-Log3"), "sgamut3", dcp::ColourConversion::s_gamut3_to_xyz ()));
}

PresetColourConversion
PresetColourConversion::from_id (string s)
{
	for (auto const& i: _presets) {
		if (i.id == s) {
			return i;
		}
	}

	DCPOMATIC_ASSERT (false);
}