/*
    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 "AbstractFontConverter.h"

#include <algorithm>
#include <fstream>
#include <Containers/Array.h>
#include <Utility/Assert.h>
#include <Utility/Unicode.h>

namespace Magnum { namespace Text {

AbstractFontConverter::AbstractFontConverter() = default;

AbstractFontConverter::AbstractFontConverter(PluginManager::AbstractManager* manager, std::string plugin): PluginManager::AbstractPlugin(manager, std::move(plugin)) {}

std::vector<std::pair<std::string, Containers::Array<unsigned char>>> AbstractFontConverter::exportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::string& characters) const {
    CORRADE_ASSERT(features() >= (Feature::ExportFont|Feature::ConvertData),
        "Text::AbstractFontConverter::exportFontToData(): feature not supported", {});

    return doExportFontToData(font, cache, filename, uniqueUnicode(characters));
}

#ifndef _WIN32
std::vector<std::pair<std::string, Containers::Array<unsigned char>>> AbstractFontConverter::doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::u32string& characters) const
#else
std::vector<std::pair<std::string, Containers::Array<unsigned char>>> AbstractFontConverter::doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::vector<char32_t>& characters) const
#endif
{
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::exportFontToData(): feature advertised but not implemented", {});

    std::vector<std::pair<std::string, Containers::Array<unsigned char>>> out;
    out.emplace_back(filename, std::move(doExportFontToSingleData(font, cache, characters)));
    return std::move(out);
}

Containers::Array<unsigned char> AbstractFontConverter::exportFontToSingleData(AbstractFont& font, GlyphCache& cache, const std::string& characters) const {
    CORRADE_ASSERT(features() >= (Feature::ExportFont|Feature::ConvertData),
        "Text::AbstractFontConverter::exportFontToSingleData(): feature not supported", nullptr);
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::exportFontToSingleData(): the format is not single-file", nullptr);

    return doExportFontToSingleData(font, cache, uniqueUnicode(characters));
}

#ifndef _WIN32
Containers::Array<unsigned char> AbstractFontConverter::doExportFontToSingleData(AbstractFont&, GlyphCache&, const std::u32string&) const
#else
Containers::Array<unsigned char> AbstractFontConverter::doExportFontToSingleData(AbstractFont&, GlyphCache&, const std::vector<char32_t>&) const
#endif
{
    CORRADE_ASSERT(false,
        "Text::AbstractFontConverter::exportFontToSingleData(): feature advertised but not implemented", nullptr);
}

bool AbstractFontConverter::exportFontToFile(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::string& characters) const {
    CORRADE_ASSERT(features() & Feature::ExportFont,
        "Text::AbstractFontConverter::exportFontToFile(): feature not supported", false);

    return doExportFontToFile(font, cache, filename, uniqueUnicode(characters));
}

#ifndef _WIN32
bool AbstractFontConverter::doExportFontToFile(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::u32string& characters) const
#else
bool AbstractFontConverter::doExportFontToFile(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::vector<char32_t>& characters) const
#endif
{
    CORRADE_ASSERT(features() & Feature::ConvertData,
        "Text::AbstractFontConverter::exportFontToFile(): not implemented", false);

    /* Export all data */
    const auto data = doExportFontToData(font, cache, filename, characters);
    for(const auto& d: data) {
        /* Open file */
        std::ofstream out(d.first.data(), std::ios::binary);
        if(!out.good()) {
            Error() << "Text::AbstractFontConverter::exportFontToFile(): cannot write to file" << d.first;
            return false;
        }

        /* Write data, close */
        out.write(reinterpret_cast<const char*>(d.second.begin()), d.second.size());
    }

    return true;
}

std::vector<std::pair<std::string, Containers::Array<unsigned char>>> AbstractFontConverter::exportGlyphCacheToData(GlyphCache& cache, const std::string& filename) const {
    CORRADE_ASSERT(features() >= (Feature::ExportGlyphCache|Feature::ConvertData),
        "Text::AbstractFontConverter::exportGlyphCacheToData(): feature not supported", {});

    return doExportGlyphCacheToData(cache, filename);
}

std::vector<std::pair<std::string, Containers::Array<unsigned char>>> AbstractFontConverter::doExportGlyphCacheToData(GlyphCache& cache, const std::string& filename) const {
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::exportGlyphCacheToData(): feature advertised but not implemented", {});

    std::vector<std::pair<std::string, Containers::Array<unsigned char>>> out;
    out.emplace_back(filename, std::move(doExportGlyphCacheToSingleData(cache)));
    return std::move(out);
}

Containers::Array<unsigned char> AbstractFontConverter::exportGlyphCacheToSingleData(GlyphCache& cache) const {
    CORRADE_ASSERT(features() >= (Feature::ExportGlyphCache|Feature::ConvertData),
        "Text::AbstractFontConverter::exportGlyphCacheToSingleData(): feature not supported", nullptr);
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::exportGlyphCacheToSingleData(): the format is not single-file", nullptr);

    return doExportGlyphCacheToSingleData(cache);
}

Containers::Array<unsigned char> AbstractFontConverter::doExportGlyphCacheToSingleData(GlyphCache&) const {
    CORRADE_ASSERT(false,
        "Text::AbstractFontConverter::exportGlyphCacheToSingleData(): feature advertised but not implemented", nullptr);
}

bool AbstractFontConverter::exportGlyphCacheToFile(GlyphCache& cache, const std::string& filename) const {
    CORRADE_ASSERT(features() & Feature::ExportGlyphCache,
        "Text::AbstractFontConverter::exportGlyphCacheToFile(): feature not supported", false);

    return doExportGlyphCacheToFile(cache, filename);
}

bool AbstractFontConverter::doExportGlyphCacheToFile(GlyphCache& cache, const std::string& filename) const {
    CORRADE_ASSERT(features() & Feature::ConvertData,
        "Text::AbstractFontConverter::exportGlyphCacheToFile(): not implemented", false);

    /* Export all data */
    const auto data = doExportGlyphCacheToData(cache, filename);
    for(const auto& d: data) {
        /* Open file */
        std::ofstream out(d.first.data(), std::ios::binary);
        if(!out.good()) {
            Error() << "Text::AbstractFontConverter::exportGlyphCacheToFile(): cannot write to file" << d.first;
            return false;
        }

        /* Write data, close */
        out.write(reinterpret_cast<const char*>(d.second.begin()), d.second.size());
    }

    return true;
}

GlyphCache* AbstractFontConverter::importGlyphCacheFromData(const std::vector<std::pair<std::string, Containers::ArrayReference<const unsigned char>>>& data) const {
    CORRADE_ASSERT(features() >= (Feature::ImportGlyphCache|Feature::ConvertData),
        "Text::AbstractFontConverter::importGlyphCacheFromData(): feature not supported", nullptr);
    CORRADE_ASSERT(!data.empty(),
        "Text::AbstractFontConverter::importGlyphCacheFromData(): no data passed", nullptr);

    return doImportGlyphCacheFromData(data);
}

GlyphCache* AbstractFontConverter::doImportGlyphCacheFromData(const std::vector<std::pair<std::string, Containers::ArrayReference<const unsigned char>>>& data) const {
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::importGlyphCacheFromData(): feature advertised but not implemented", nullptr);
    CORRADE_ASSERT(data.size() == 1,
        "Text::AbstractFontConverter::importGlyphCacheFromData(): expected just one file for single-file format", nullptr);

    return doImportGlyphCacheFromSingleData(data[0].second);
}

GlyphCache* AbstractFontConverter::importGlyphCacheFromSingleData(Containers::ArrayReference<const unsigned char> data) const {
    CORRADE_ASSERT(features() >= (Feature::ImportGlyphCache|Feature::ConvertData),
        "Text::AbstractFontConverter::importGlyphCacheFromSingleData(): feature not supported", nullptr);
    CORRADE_ASSERT(!(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::importGlyphCacheFromSingleData(): the format is not single-file", nullptr);

    return doImportGlyphCacheFromSingleData(data);
}

GlyphCache* AbstractFontConverter::doImportGlyphCacheFromSingleData(Containers::ArrayReference<const unsigned char>) const {
    CORRADE_ASSERT(false,
        "Text::AbstractFontConverter::importGlyphCacheFromSingleData(): feature advertised but not implemented", nullptr);
}

GlyphCache* AbstractFontConverter::importGlyphCacheFromFile(const std::string& filename) const {
    CORRADE_ASSERT(features() & Feature::ImportGlyphCache,
        "Text::AbstractFontConverter::importGlyphCacheFromFile(): feature not supported", nullptr);

    return doImportGlyphCacheFromFile(filename);
}

GlyphCache* AbstractFontConverter::doImportGlyphCacheFromFile(const std::string& filename) const {
    CORRADE_ASSERT(features() & Feature::ConvertData && !(features() & Feature::MultiFile),
        "Text::AbstractFontConverter::importGlyphCacheFromFile(): not implemented", nullptr);

    /* Open file */
    std::ifstream in(filename.data(), std::ios::binary);
    if(!in.good()) {
        Error() << "Trade::AbstractFontConverter::importGlyphCacheFromFile(): cannot open file" << filename;
        return nullptr;
    }

    /* Create array to hold file contents */
    in.seekg(0, std::ios::end);
    Containers::Array<unsigned char> data(in.tellg());

    /* Read data, close */
    in.seekg(0, std::ios::beg);
    in.read(reinterpret_cast<char*>(data.begin()), data.size());
    in.close();

    return doImportGlyphCacheFromSingleData(data);
}

#ifndef _WIN32
std::u32string AbstractFontConverter::uniqueUnicode(const std::string& characters)
#else
std::vector<char32_t> AbstractFontConverter::uniqueUnicode(const std::string& characters)
#endif
{
    /* Convert UTF-8 to UTF-32 */
    #ifndef _WIN32
    std::u32string result = Utility::Unicode::utf32(characters);
    #else
    std::vector<char32_t> result = Utility::Unicode::utf32(characters);
    #endif

    /* Remove duplicate glyphs */
    std::sort(result.begin(), result.end());
    result.erase(std::unique(result.begin(), result.end()), result.end());

    return std::move(result);
}

}}