/*
    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.

*/

#include "raw_convert.h"
#include "subtitle_asset.h"
#include "util.h"
#include "xml.h"
#include "font_node.h"
#include "text_node.h"
#include "subtitle_string.h"
#include "dcp_assert.h"
#include "AS_DCP.h"
#include "KM_util.h"
#include <libxml++/nodes/element.h>
#include <boost/algorithm/string.hpp>
#include <boost/shared_array.hpp>
#include <fstream>

using std::string;
using std::list;
using std::ostream;
using std::ofstream;
using std::stringstream;
using std::cout;
using std::cerr;
using std::map;
using boost::shared_ptr;
using boost::shared_array;
using boost::optional;
using boost::dynamic_pointer_cast;
using namespace dcp;

SubtitleAsset::SubtitleAsset ()
{

}

SubtitleAsset::SubtitleAsset (boost::filesystem::path file)
	: Asset (file)
{

}

void
SubtitleAsset::parse_subtitles (shared_ptr<cxml::Document> xml, list<shared_ptr<dcp::FontNode> > font_nodes)
{
	/* Make Subtitle objects to represent the raw XML nodes in a sane way */
	ParseState parse_state;
	examine_font_nodes (xml, font_nodes, parse_state);
}

void
SubtitleAsset::examine_font_nodes (
	shared_ptr<const cxml::Node> xml,
	list<shared_ptr<dcp::FontNode> > const & font_nodes,
	ParseState& parse_state
	)
{
	for (list<shared_ptr<dcp::FontNode> >::const_iterator i = font_nodes.begin(); i != font_nodes.end(); ++i) {

		parse_state.font_nodes.push_back (*i);
		maybe_add_subtitle ((*i)->text, parse_state);

		for (list<shared_ptr<dcp::SubtitleNode> >::iterator j = (*i)->subtitle_nodes.begin(); j != (*i)->subtitle_nodes.end(); ++j) {
			parse_state.subtitle_nodes.push_back (*j);
			examine_text_nodes (xml, (*j)->text_nodes, parse_state);
			examine_font_nodes (xml, (*j)->font_nodes, parse_state);
			parse_state.subtitle_nodes.pop_back ();
		}

		examine_font_nodes (xml, (*i)->font_nodes, parse_state);
		examine_text_nodes (xml, (*i)->text_nodes, parse_state);

		parse_state.font_nodes.pop_back ();
	}
}

void
SubtitleAsset::examine_text_nodes (
	shared_ptr<const cxml::Node> xml,
	list<shared_ptr<dcp::TextNode> > const & text_nodes,
	ParseState& parse_state
	)
{
	for (list<shared_ptr<dcp::TextNode> >::const_iterator i = text_nodes.begin(); i != text_nodes.end(); ++i) {
		parse_state.text_nodes.push_back (*i);
		maybe_add_subtitle ((*i)->text, parse_state);
		examine_font_nodes (xml, (*i)->font_nodes, parse_state);
		parse_state.text_nodes.pop_back ();
	}
}

void
SubtitleAsset::maybe_add_subtitle (string text, ParseState const & parse_state)
{
	if (empty_or_white_space (text)) {
		return;
	}

	if (parse_state.text_nodes.empty() || parse_state.subtitle_nodes.empty ()) {
		return;
	}

	DCP_ASSERT (!parse_state.text_nodes.empty ());
	DCP_ASSERT (!parse_state.subtitle_nodes.empty ());

	dcp::FontNode effective_font (parse_state.font_nodes);
	dcp::TextNode effective_text (*parse_state.text_nodes.back ());
	dcp::SubtitleNode effective_subtitle (*parse_state.subtitle_nodes.back ());

	_subtitles.push_back (
		SubtitleString (
			effective_font.id,
			effective_font.italic.get_value_or (false),
			effective_font.colour.get_value_or (dcp::Colour (255, 255, 255)),
			effective_font.size,
			effective_font.aspect_adjust.get_value_or (1.0),
			effective_subtitle.in,
			effective_subtitle.out,
			effective_text.h_position,
			effective_text.h_align,
			effective_text.v_position,
			effective_text.v_align,
			text,
			effective_font.effect.get_value_or (NONE),
			effective_font.effect_colour.get_value_or (dcp::Colour (0, 0, 0)),
			effective_subtitle.fade_up_time,
			effective_subtitle.fade_down_time
			)
		);
}

list<SubtitleString>
SubtitleAsset::subtitles_during (Time from, Time to) const
{
	list<SubtitleString> s;
	for (list<SubtitleString>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
		if (i->out() >= from && i->in() <= to) {
			s.push_back (*i);
		}
	}

	return s;
}

void
SubtitleAsset::add (SubtitleString s)
{
	_subtitles.push_back (s);
}

Time
SubtitleAsset::latest_subtitle_out () const
{
	Time t;
	for (list<SubtitleString>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
		if (i->out() > t) {
			t = i->out ();
		}
	}

	return t;
}

bool
SubtitleAsset::equals (shared_ptr<const Asset> other_asset, EqualityOptions options, NoteHandler note) const
{
	if (!Asset::equals (other_asset, options, note)) {
		return false;
	}

	shared_ptr<const SubtitleAsset> other = dynamic_pointer_cast<const SubtitleAsset> (other_asset);
	if (!other) {
		return false;
	}

	if (_subtitles != other->_subtitles) {
		note (DCP_ERROR, "subtitles differ");
		return false;
	}

	return true;
}

struct SubtitleSorter {
	bool operator() (SubtitleString const & a, SubtitleString const & b) {
		if (a.in() != b.in()) {
			return a.in() < b.in();
		}
		return a.v_position() < b.v_position();
	}
};

void
SubtitleAsset::subtitles_as_xml (xmlpp::Element* root, int time_code_rate, string xmlns) const
{
	list<SubtitleString> sorted = _subtitles;
	sorted.sort (SubtitleSorter ());

	/* XXX: script, underlined, weight not supported */

	optional<string> font;
	bool italic = false;
	Colour colour;
	int size = 0;
	float aspect_adjust = 1.0;
	Effect effect = NONE;
	Colour effect_colour;
	int spot_number = 1;
	Time last_in;
	Time last_out;
	Time last_fade_up_time;
	Time last_fade_down_time;

	xmlpp::Element* font_element = 0;
	xmlpp::Element* subtitle_element = 0;

	for (list<SubtitleString>::iterator i = sorted.begin(); i != sorted.end(); ++i) {

		/* We will start a new <Font>...</Font> whenever some font property changes.
		   I suppose we should really make an optimal hierarchy of <Font> tags, but
		   that seems hard.
		*/

		bool const font_changed =
			font          != i->font()          ||
			italic        != i->italic()        ||
			colour        != i->colour()        ||
			size          != i->size()          ||
			fabs (aspect_adjust - i->aspect_adjust()) > ASPECT_ADJUST_EPSILON ||
			effect        != i->effect()        ||
			effect_colour != i->effect_colour();

		if (font_changed) {
			font = i->font ();
			italic = i->italic ();
			colour = i->colour ();
			size = i->size ();
			aspect_adjust = i->aspect_adjust ();
			effect = i->effect ();
			effect_colour = i->effect_colour ();
		}

		if (!font_element || font_changed) {
			font_element = root->add_child ("Font", xmlns);
			if (font) {
				font_element->set_attribute ("Id", font.get ());
			}
			font_element->set_attribute ("Italic", italic ? "yes" : "no");
			font_element->set_attribute ("Color", colour.to_argb_string());
			font_element->set_attribute ("Size", raw_convert<string> (size));
			if (fabs (aspect_adjust - 1.0) > ASPECT_ADJUST_EPSILON) {
				font_element->set_attribute ("AspectAdjust", raw_convert<string> (aspect_adjust));
			}
			font_element->set_attribute ("Effect", effect_to_string (effect));
			font_element->set_attribute ("EffectColor", effect_colour.to_argb_string());
			font_element->set_attribute ("Script", "normal");
			font_element->set_attribute ("Underlined", "no");
			font_element->set_attribute ("Weight", "normal");
		}

		if (!subtitle_element || font_changed ||
		    (last_in != i->in() ||
		     last_out != i->out() ||
		     last_fade_up_time != i->fade_up_time() ||
		     last_fade_down_time != i->fade_down_time()
			    )) {

			subtitle_element = font_element->add_child ("Subtitle", xmlns);
			subtitle_element->set_attribute ("SpotNumber", raw_convert<string> (spot_number++));
			subtitle_element->set_attribute ("TimeIn", i->in().rebase(time_code_rate).as_string());
			subtitle_element->set_attribute ("TimeOut", i->out().rebase(time_code_rate).as_string());
			subtitle_element->set_attribute ("FadeUpTime", raw_convert<string> (i->fade_up_time().as_editable_units(time_code_rate)));
			subtitle_element->set_attribute ("FadeDownTime", raw_convert<string> (i->fade_down_time().as_editable_units(time_code_rate)));

			last_in = i->in ();
			last_out = i->out ();
			last_fade_up_time = i->fade_up_time ();
			last_fade_down_time = i->fade_down_time ();
		}

		xmlpp::Element* text = subtitle_element->add_child ("Text", xmlns);
		if (i->h_align() != HALIGN_CENTER) {
			text->set_attribute ("HAlign", halign_to_string (i->h_align ()));
		}
		if (i->h_position() > ALIGN_EPSILON) {
			text->set_attribute ("HPosition", raw_convert<string> (i->h_position() * 100, 6));
		}
		text->set_attribute ("VAlign", valign_to_string (i->v_align()));
		text->set_attribute ("VPosition", raw_convert<string> (i->v_position() * 100, 6));
		text->add_child_text (i->text());
	}
}