/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include <PluginManager/Manager.h>
#include <Utility/Arguments.h>
#include <Utility/Directory.h>

#include "Platform/WindowlessGlxApplication.h"
#include "Text/AbstractFont.h"
#include "Text/AbstractFontConverter.h"
#include "Text/DistanceFieldGlyphCache.h"
#include "Trade/AbstractImageConverter.h"

#include "configure.h"

namespace Magnum { namespace Text {

class FontConverter: public Platform::WindowlessApplication {
    public:
        explicit FontConverter(const Arguments& arguments);

        int exec() override;

    private:
        Utility::Arguments args;
};

FontConverter::FontConverter(const Arguments& arguments): Platform::WindowlessApplication(arguments, nullptr) {
    args.addArgument("input").setHelp("input", "input font")
        .addArgument("output").setHelp("output", "output filename prefix")
        .addNamedArgument("font").setHelp("font", "plugin for opening the font")
        .addNamedArgument("converter").setHelp("converter", "plugin for converting the font")
        .addOption("plugin-dir", MAGNUM_PLUGINS_DIR).setHelpKey("plugin-dir", "DIR").setHelp("plugin-dir", "base plugin dir")
        .addOption("characters", "abcdefghijklmnopqrstuvwxyz"
                                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                 "0123456789?!:,. ").setHelp("characters", "characters to include in the output")
        .addOption("font-size", "128").setHelpKey("font-size", "\"X Y\"").setHelp("font-size", "TTF font size")
        .addOption("atlas-size", "2048 2048").setHelpKey("atlas-size", "\"X Y\"").setHelp("atlas-size", "glyph atlas size")
        .addOption("output-size", "256 256").setHelpKey("output-size", "\"X Y\"").setHelp("output-size", "output atlas size. If set to zero size, distance field computation will not be used.")
        .addOption("radius", "24").setHelpKey("radius", "N").setHelp("radius", "distance field computation radius")
        .setHelp("Converts font to raster one of given atlas size.")
        .parse(arguments.argc, arguments.argv);

    createContext({});
}

int FontConverter::exec() {
    /* Font converter dependencies */
    PluginManager::Manager<Trade::AbstractImageConverter> imageConverterManager(Utility::Directory::join(MAGNUM_PLUGINS_DIR, "imageconverters/"));

    /* Load font */
    PluginManager::Manager<Text::AbstractFont> fontManager(Utility::Directory::join(MAGNUM_PLUGINS_DIR, "fonts/"));
    std::unique_ptr<Text::AbstractFont> font;
    if(!(fontManager.load(args.value("font")) & PluginManager::LoadState::Loaded) ||
       !(font = fontManager.instance(args.value("font")))) {
        Error() << "Cannot load plugin" << args.value("font") << "from" << fontManager.pluginDirectory();
        std::exit(1);
    }

    /* Load font converter */
    PluginManager::Manager<Text::AbstractFontConverter> converterManager(Utility::Directory::join(MAGNUM_PLUGINS_DIR, "fontconverters/"));
    std::unique_ptr<Text::AbstractFontConverter> converter;
    if(!(converterManager.load(args.value("converter")) & PluginManager::LoadState::Loaded) ||
       !(converter = converterManager.instance(args.value("converter")))) {
        Error() << "Cannot load plugin" << args.value("converter") << "from" << converterManager.pluginDirectory();
        std::exit(1);
    }

    /* Open font */
    if(!font->openFile(args.value("input"), args.value<Float>("font-size"))) {
        Error() << "Cannot open font" << args.value("input");
        std::exit(1);
    }

    /* Create distance field glyph cache if radius is specified */
    std::unique_ptr<Text::GlyphCache> cache;
    if(!args.value<Vector2i>("output-size").isZero()) {
        Debug() << "Populating distance field glyph cache...";

        cache.reset(new Text::DistanceFieldGlyphCache(
            args.value<Vector2i>("atlas-size"),
            args.value<Vector2i>("output-size"),
            args.value<Int>("radius")));

    /* Otherwise use normal cache */
    } else {
        Debug() << "Zero-size distance field output specified, populating normal glyph cache...";

        cache.reset(new Text::GlyphCache(args.value<Vector2i>("atlas-size")));
    }

    /* Fill the cache */
    font->fillGlyphCache(*cache, args.value("characters"));

    Debug() << "Converting font...";

    /* Convert the font */
    if(!converter->exportFontToFile(*font, *cache, args.value("output"), args.value("characters"))) {
        Error() << "Cannot export font to" << args.value("output");
        std::exit(1);
    }

    Debug() << "Done.";

    return 0;
}

}}

MAGNUM_WINDOWLESSAPPLICATION_MAIN(Magnum::Text::FontConverter)