/*
    Copyright (C) 2013-2016 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 "video_content.h"
#include "content.h"
#include "video_examiner.h"
#include "compose.hpp"
#include "ratio.h"
#include "config.h"
#include "colour_conversion.h"
#include "util.h"
#include "film.h"
#include "exceptions.h"
#include "frame_rate_change.h"
#include "log.h"
#include "safe_stringstream.h"
#include "raw_convert.h"
#include <libcxml/cxml.h>
#include <dcp/colour_matrix.h>
#include <libxml++/libxml++.h>
#include <iomanip>
#include <iostream>

#include "i18n.h"

#define LOG_GENERAL(...) _parent->film()->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);

int const VideoContentProperty::SIZE	  = 0;
int const VideoContentProperty::FRAME_TYPE  = 1;
int const VideoContentProperty::CROP	  = 2;
int const VideoContentProperty::SCALE	  = 3;
int const VideoContentProperty::COLOUR_CONVERSION = 4;
int const VideoContentProperty::FADE_IN     = 5;
int const VideoContentProperty::FADE_OUT    = 6;

using std::string;
using std::setprecision;
using std::cout;
using std::vector;
using std::min;
using std::max;
using std::fixed;
using std::setprecision;
using std::list;
using std::pair;
using boost::shared_ptr;
using boost::optional;
using boost::dynamic_pointer_cast;

VideoContent::VideoContent (Content* parent)
	: ContentPart (parent)
	, _length (0)
	, _frame_type (VIDEO_FRAME_TYPE_2D)
	, _scale (VideoContentScale (Ratio::from_id ("178")))
	, _yuv (true)
	, _fade_in (0)
	, _fade_out (0)
{

}

shared_ptr<VideoContent>
VideoContent::from_xml (Content* parent, cxml::ConstNodePtr node, int version)
{
	if (!node->optional_number_child<int> ("VideoWidth")) {
		return shared_ptr<VideoContent> ();
	}

	return shared_ptr<VideoContent> (new VideoContent (parent, node, version));
}

VideoContent::VideoContent (Content* parent, cxml::ConstNodePtr node, int version)
	: ContentPart (parent)
{
	_size.width = node->number_child<int> ("VideoWidth");
	_size.height = node->number_child<int> ("VideoHeight");

	/* Backwards compatibility */
	optional<double> r = node->optional_number_child<double>("VideoFrameRate");
	if (r) {
		_parent->set_video_frame_rate (r.get ());
	}

	_length = node->number_child<Frame> ("VideoLength");
	_frame_type = static_cast<VideoFrameType> (node->number_child<int> ("VideoFrameType"));
	_sample_aspect_ratio = node->optional_number_child<double> ("SampleAspectRatio");
	_crop.left = node->number_child<int> ("LeftCrop");
	_crop.right = node->number_child<int> ("RightCrop");
	_crop.top = node->number_child<int> ("TopCrop");
	_crop.bottom = node->number_child<int> ("BottomCrop");

	if (version <= 7) {
		optional<string> r = node->optional_string_child ("Ratio");
		if (r) {
			_scale = VideoContentScale (Ratio::from_id (r.get ()));
		}
	} else {
		_scale = VideoContentScale (node->node_child ("Scale"));
	}


	if (node->optional_node_child ("ColourConversion")) {
		_colour_conversion = ColourConversion (node->node_child ("ColourConversion"), version);
	}

	_yuv = node->optional_bool_child("YUV").get_value_or (true);

	if (version >= 32) {
		_fade_in = node->number_child<Frame> ("FadeIn");
		_fade_out = node->number_child<Frame> ("FadeOut");
	} else {
		_fade_in = _fade_out = 0;
	}
}

VideoContent::VideoContent (Content* parent, vector<shared_ptr<Content> > c)
	: ContentPart (parent)
	, _length (0)
	, _yuv (false)
{
	shared_ptr<VideoContent> ref = c[0]->video;
	DCPOMATIC_ASSERT (ref);

	for (size_t i = 1; i < c.size(); ++i) {

		if (c[i]->video->size() != ref->size()) {
			throw JoinError (_("Content to be joined must have the same picture size."));
		}

		if (c[i]->video->frame_type() != ref->frame_type()) {
			throw JoinError (_("Content to be joined must have the same video frame type."));
		}

		if (c[i]->video->crop() != ref->crop()) {
			throw JoinError (_("Content to be joined must have the same crop."));
		}

		if (c[i]->video->scale() != ref->scale()) {
			throw JoinError (_("Content to be joined must have the same scale setting."));
		}

		if (c[i]->video->colour_conversion() != ref->colour_conversion()) {
			throw JoinError (_("Content to be joined must have the same colour conversion."));
		}

		if (c[i]->video->fade_in() != ref->fade_in() || c[i]->video->fade_out() != ref->fade_out()) {
			throw JoinError (_("Content to be joined must have the same fades."));
		}

		_length += c[i]->video->length ();

		if (c[i]->video->yuv ()) {
			_yuv = true;
		}
	}

	_size = ref->size ();
	_frame_type = ref->frame_type ();
	_crop = ref->crop ();
	_scale = ref->scale ();
	_colour_conversion = ref->colour_conversion ();
	_fade_in = ref->fade_in ();
	_fade_out = ref->fade_out ();
}

void
VideoContent::as_xml (xmlpp::Node* node) const
{
	boost::mutex::scoped_lock lm (_mutex);
	node->add_child("VideoLength")->add_child_text (raw_convert<string> (_length));
	node->add_child("VideoWidth")->add_child_text (raw_convert<string> (_size.width));
	node->add_child("VideoHeight")->add_child_text (raw_convert<string> (_size.height));
	node->add_child("VideoFrameType")->add_child_text (raw_convert<string> (static_cast<int> (_frame_type)));
	if (_sample_aspect_ratio) {
		node->add_child("SampleAspectRatio")->add_child_text (raw_convert<string> (_sample_aspect_ratio.get ()));
	}
	_crop.as_xml (node);
	_scale.as_xml (node->add_child("Scale"));
	if (_colour_conversion) {
		_colour_conversion.get().as_xml (node->add_child("ColourConversion"));
	}
	node->add_child("YUV")->add_child_text (_yuv ? "1" : "0");
	node->add_child("FadeIn")->add_child_text (raw_convert<string> (_fade_in));
	node->add_child("FadeOut")->add_child_text (raw_convert<string> (_fade_out));
}

void
VideoContent::take_from_examiner (shared_ptr<VideoExaminer> d)
{
	/* These examiner calls could call other content methods which take a lock on the mutex */
	dcp::Size const vs = d->video_size ();
	Frame vl = d->video_length ();
	optional<double> const ar = d->sample_aspect_ratio ();
	bool const yuv = d->yuv ();

	{
		boost::mutex::scoped_lock lm (_mutex);
		_size = vs;
		_length = vl;
		_sample_aspect_ratio = ar;
		_yuv = yuv;

		/* Guess correct scale from size and sample aspect ratio */
		_scale = VideoContentScale (
			Ratio::nearest_from_ratio (double (_size.width) * ar.get_value_or (1) / _size.height)
			);
	}

	LOG_GENERAL ("Video length obtained from header as %1 frames", _length);

	if (d->video_frame_rate()) {
		_parent->set_video_frame_rate (d->video_frame_rate().get());
	}

	_parent->signal_changed (VideoContentProperty::SIZE);
	_parent->signal_changed (VideoContentProperty::SCALE);
	_parent->signal_changed (ContentProperty::LENGTH);
}

/** @return string which includes everything about how this content looks */
string
VideoContent::identifier () const
{
	SafeStringStream s;
	s << crop().left
	  << "_" << crop().right
	  << "_" << crop().top
	  << "_" << crop().bottom
	  << "_" << scale().id()
	  << "_" << _fade_in
	  << "_" << _fade_out;

	if (colour_conversion()) {
		s << "_" << colour_conversion().get().identifier ();
	}

	return s.str ();
}

string
VideoContent::technical_summary () const
{
	string s = String::compose (
		N_("video: length %1 frames, size %2x%3"),
		length_after_3d_combine(),
		size().width,
		size().height
		);

	if (sample_aspect_ratio ()) {
		s += String::compose (N_(", sample aspect ratio %1"), (sample_aspect_ratio().get ()));
	}

	return s;
}

dcp::Size
VideoContent::size_after_3d_split () const
{
	dcp::Size const s = size ();
	switch (frame_type ()) {
	case VIDEO_FRAME_TYPE_2D:
	case VIDEO_FRAME_TYPE_3D_ALTERNATE:
	case VIDEO_FRAME_TYPE_3D_LEFT:
	case VIDEO_FRAME_TYPE_3D_RIGHT:
		return s;
	case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
		return dcp::Size (s.width / 2, s.height);
	case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
		return dcp::Size (s.width, s.height / 2);
	}

	DCPOMATIC_ASSERT (false);
}

/** @return Video size after 3D split and crop */
dcp::Size
VideoContent::size_after_crop () const
{
	return crop().apply (size_after_3d_split ());
}

void
VideoContent::scale_and_crop_to_fit_width ()
{
	shared_ptr<const Film> film = _parent->film ();
	set_scale (VideoContentScale (film->container ()));

	int const crop = max (0, int (size().height - double (film->frame_size().height) * size().width / film->frame_size().width));
	set_left_crop (0);
	set_right_crop (0);
	set_top_crop (crop / 2);
	set_bottom_crop (crop / 2);
}

void
VideoContent::scale_and_crop_to_fit_height ()
{
	shared_ptr<const Film> film = _parent->film ();
	set_scale (VideoContentScale (film->container ()));

	int const crop = max (0, int (size().width - double (film->frame_size().width) * size().height / film->frame_size().height));
	set_left_crop (crop / 2);
	set_right_crop (crop / 2);
	set_top_crop (0);
	set_bottom_crop (0);
}

/** @param f Frame index within the whole (untrimmed) content */
optional<double>
VideoContent::fade (Frame f) const
{
	DCPOMATIC_ASSERT (f >= 0);

	shared_ptr<const Film> film = _parent->film ();

	double const vfr = _parent->active_video_frame_rate ();

	Frame const ts = _parent->trim_start().frames_round(vfr);
	if ((f - ts) < fade_in()) {
		return double (f - ts) / fade_in();
	}

	Frame fade_out_start = length() - _parent->trim_end().frames_round(vfr) - fade_out();
	if (f >= fade_out_start) {
		return 1 - double (f - fade_out_start) / fade_out();
	}

	return optional<double> ();
}

string
VideoContent::processing_description () const
{
	/* stringstream is OK here as this string is just for presentation to the user */
	SafeStringStream d;

	if (size().width && size().height) {
		d << String::compose (
			_("Content video is %1x%2"),
			size_after_3d_split().width,
			size_after_3d_split().height
			);


		double ratio = size_after_3d_split().ratio ();

		if (sample_aspect_ratio ()) {
			d << ", " << _("pixel aspect ratio") << " " << fixed << setprecision(2) << sample_aspect_ratio().get () << ":1";
			ratio *= sample_aspect_ratio().get ();
		}

		d << "\n" << _("Display aspect ratio") << " " << fixed << setprecision(2) << ratio << ":1\n";
	}

	if ((crop().left || crop().right || crop().top || crop().bottom) && size() != dcp::Size (0, 0)) {
		dcp::Size cropped = size_after_crop ();
		d << String::compose (
			_("Cropped to %1x%2"),
			cropped.width, cropped.height
			);

		d << " (" << fixed << setprecision(2) << cropped.ratio () << ":1)\n";
	}

	shared_ptr<const Film> film = _parent->film ();
	dcp::Size const container_size = film->frame_size ();
	dcp::Size const scaled = scale().size (shared_from_this(), container_size, container_size);

	if (scaled != size_after_crop ()) {
		d << String::compose (
			_("Scaled to %1x%2"),
			scaled.width, scaled.height
			);

		d << " (" << fixed << setprecision(2) << scaled.ratio() << ":1)\n";
	}

	if (scaled != container_size) {
		d << String::compose (
			_("Padded with black to fit container %1 (%2x%3)"),
			film->container()->nickname (),
			container_size.width, container_size.height
			);

		d << " (" << fixed << setprecision(2) << container_size.ratio () << ":1)\n";
	}

	if (_parent->video_frame_rate()) {
		double const vfr = _parent->video_frame_rate().get ();

		d << _("Content frame rate");
		d << " " << fixed << setprecision(4) << vfr << "\n";

		FrameRateChange frc (vfr, film->video_frame_rate ());
		d << frc.description () << "\n";
	}

	return d.str ();
}

void
VideoContent::add_properties (list<UserProperty>& p) const
{
	p.push_back (UserProperty (_("Video"), _("Length"), raw_convert<string> (length ()), _("video frames")));
	p.push_back (UserProperty (_("Video"), _("Size"), raw_convert<string> (size().width) + "x" + raw_convert<string> (size().height)));
}

void
VideoContent::set_length (Frame len)
{
	maybe_set (_length, len, ContentProperty::LENGTH);
}

void
VideoContent::set_left_crop (int c)
{
	maybe_set (_crop.left, c, VideoContentProperty::CROP);
}

void
VideoContent::set_right_crop (int c)
{
	maybe_set (_crop.right, c, VideoContentProperty::CROP);
}

void
VideoContent::set_top_crop (int c)
{
	maybe_set (_crop.top, c, VideoContentProperty::CROP);
}

void
VideoContent::set_bottom_crop (int c)
{
	maybe_set (_crop.bottom, c, VideoContentProperty::CROP);
}

void
VideoContent::set_scale (VideoContentScale s)
{
	maybe_set (_scale, s, VideoContentProperty::SCALE);
}

void
VideoContent::set_frame_type (VideoFrameType t)
{
	maybe_set (_frame_type, t, VideoContentProperty::FRAME_TYPE);
}

void
VideoContent::unset_colour_conversion ()
{
	maybe_set (_colour_conversion, boost::optional<ColourConversion> (), VideoContentProperty::COLOUR_CONVERSION);
}

void
VideoContent::set_colour_conversion (ColourConversion c)
{
	maybe_set (_colour_conversion, c, VideoContentProperty::COLOUR_CONVERSION);
}

void
VideoContent::set_fade_in (Frame t)
{
	maybe_set (_fade_in, t, VideoContentProperty::FADE_IN);
}

void
VideoContent::set_fade_out (Frame t)
{
	maybe_set (_fade_out, t, VideoContentProperty::FADE_OUT);
}