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/*
Minetest
Copyright (C) 2010-2014 sapier <sapier at gmx dot net>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "fontengine.h"
#include <cmath>
#include "client/renderingengine.h"
#include "config.h"
#include "porting.h"
#include "filesys.h"
#include "gettext.h"
#include "irrlicht_changes/CGUITTFont.h"

/** maximum size distance for getting a "similar" font size */
#define MAX_FONT_SIZE_OFFSET 10

/** reference to access font engine, has to be initialized by main */
FontEngine* g_fontengine = NULL;

/** callback to be used on change of font size setting */
static void font_setting_changed(const std::string &name, void *userdata)
{
	g_fontengine->readSettings();
}

/******************************************************************************/
FontEngine::FontEngine(gui::IGUIEnvironment* env) :
	m_env(env)
{
	for (u32 &i : m_default_size) {
		i = FONT_SIZE_UNSPECIFIED;
	}

	assert(g_settings != NULL); // pre-condition
	assert(m_env != NULL); // pre-condition
	assert(m_env->getSkin() != NULL); // pre-condition

	readSettings();

	const char *settings[] = {
		"font_size", "font_bold", "font_italic", "font_size_divisible_by",
		"mono_font_size", "mono_font_size_divisible_by",
		"font_shadow", "font_shadow_alpha",
		"font_path", "font_path_bold", "font_path_italic", "font_path_bold_italic",
		"mono_font_path", "mono_font_path_bold", "mono_font_path_italic",
		"mono_font_path_bold_italic",
		"fallback_font_path",
		"screen_dpi", "gui_scaling",
	};

	for (auto name : settings)
		g_settings->registerChangedCallback(name, font_setting_changed, NULL);
}

/******************************************************************************/
FontEngine::~FontEngine()
{
	cleanCache();
}

/******************************************************************************/
void FontEngine::cleanCache()
{
	RecursiveMutexAutoLock l(m_font_mutex);

	for (auto &font_cache_it : m_font_cache) {

		for (auto &font_it : font_cache_it) {
			font_it.second->drop();
			font_it.second = nullptr;
		}
		font_cache_it.clear();
	}
}

/******************************************************************************/
irr::gui::IGUIFont *FontEngine::getFont(FontSpec spec)
{
	return getFont(spec, false);
}

irr::gui::IGUIFont *FontEngine::getFont(FontSpec spec, bool may_fail)
{
	if (spec.mode == FM_Unspecified) {
		spec.mode = m_currentMode;
	} else if (spec.mode == _FM_Fallback) {
		// Fallback font doesn't support these
		spec.bold = false;
		spec.italic = false;
	}

	// Fallback to default size
	if (spec.size == FONT_SIZE_UNSPECIFIED)
		spec.size = m_default_size[spec.mode];

	RecursiveMutexAutoLock l(m_font_mutex);

	const auto &cache = m_font_cache[spec.getHash()];
	auto it = cache.find(spec.size);
	if (it != cache.end())
		return it->second;

	// Font does not yet exist
	gui::IGUIFont *font = initFont(spec);

	if (!font && !may_fail) {
		errorstream << "Minetest cannot continue without a valid font. "
			"Please correct the 'font_path' setting or install the font "
			"file in the proper location." << std::endl;
		abort();
	}

	m_font_cache[spec.getHash()][spec.size] = font;

	return font;
}

/******************************************************************************/
unsigned int FontEngine::getTextHeight(const FontSpec &spec)
{
	gui::IGUIFont *font = getFont(spec);

	return font->getDimension(L"Some unimportant example String").Height;
}

/******************************************************************************/
unsigned int FontEngine::getTextWidth(const std::wstring &text, const FontSpec &spec)
{
	gui::IGUIFont *font = getFont(spec);

	return font->getDimension(text.c_str()).Width;
}

/** get line height for a specific font (including empty room between lines) */
unsigned int FontEngine::getLineHeight(const FontSpec &spec)
{
	gui::IGUIFont *font = getFont(spec);

	return font->getDimension(L"Some unimportant example String").Height
			+ font->getKerningHeight();
}