/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022, 2023 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 <sstream>
#include <Corrade/Containers/Optional.h>
#include <Corrade/Containers/StridedArrayView.h>
#include <Corrade/Containers/StringStl.h> /** @todo remove once AbstractFont is <string>-free */
#include <Corrade/TestSuite/Tester.h>
#include <Corrade/TestSuite/Compare/File.h>
#include <Corrade/Utility/DebugStl.h>
#include <Corrade/Utility/Path.h>

#include "Magnum/Image.h"
#include "Magnum/ImageView.h"
#include "Magnum/PixelFormat.h"
#include "Magnum/DebugTools/CompareImage.h"
#include "Magnum/Text/AbstractGlyphCache.h"
#include "Magnum/Text/AbstractFont.h"
#include "Magnum/Text/AbstractFontConverter.h"
#include "Magnum/Trade/AbstractImageConverter.h"
#include "Magnum/Trade/AbstractImporter.h"
#include "Magnum/Trade/ImageData.h"

#include "configure.h"

namespace Magnum { namespace Text { namespace Test { namespace {

struct MagnumFontConverterTest: TestSuite::Tester {
    explicit MagnumFontConverterTest();

    void exportFont();
    void exportFontEmptyCache();
    void exportFontNoGlyphCacheImageDownload();

    /* Explicitly forbid system-wide plugin dependencies */
    PluginManager::Manager<Trade::AbstractImageConverter> _imageConverterManager{"nonexistent"};
    PluginManager::Manager<AbstractFontConverter> _fontConverterManager{"nonexistent"};
    PluginManager::Manager<Trade::AbstractImporter> _importerManager{"nonexistent"};
};

MagnumFontConverterTest::MagnumFontConverterTest() {
    addTests({&MagnumFontConverterTest::exportFont,
              &MagnumFontConverterTest::exportFontEmptyCache,
              &MagnumFontConverterTest::exportFontNoGlyphCacheImageDownload});

    /* Load the plugins directly from the build tree. Otherwise they're either
       static and already loaded or not present in the build tree. */
    _fontConverterManager.registerExternalManager(_imageConverterManager);
    #if defined(TGAIMAGECONVERTER_PLUGIN_FILENAME) && defined(MAGNUMFONTCONVERTER_PLUGIN_FILENAME)
    CORRADE_INTERNAL_ASSERT_OUTPUT(_imageConverterManager.load(TGAIMAGECONVERTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    CORRADE_INTERNAL_ASSERT_OUTPUT(_fontConverterManager.load(MAGNUMFONTCONVERTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif
    /* Optional plugins that don't have to be here */
    #ifdef ANYIMAGEIMPORTER_PLUGIN_FILENAME
    CORRADE_INTERNAL_ASSERT_OUTPUT(_importerManager.load(ANYIMAGEIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif
    #ifdef TGAIMPORTER_PLUGIN_FILENAME
    CORRADE_INTERNAL_ASSERT_OUTPUT(_importerManager.load(TGAIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif

    /* Create the output directory if it doesn't exist yet */
    CORRADE_INTERNAL_ASSERT_OUTPUT(Utility::Path::make(MAGNUMFONTCONVERTER_TEST_WRITE_DIR));
}

class MyFont: public Text::AbstractFont {
    private:
        void doClose() override { _opened = false; }
        bool doIsOpened() const override { return _opened; }
        Properties doOpenFile(Containers::StringView, Float) override {
            _opened = true;
            return {16.0f, 25.0f, -10.0f, 39.7333f, 4};
        }
        FontFeatures doFeatures() const override { return {}; }
        Containers::Pointer<AbstractLayouter> doLayout(const AbstractGlyphCache&, Float, Containers::StringView) override { return nullptr; }

        UnsignedInt doGlyphId(const char32_t character) override {
            switch(character) {
                case U'W': return 2;
                case U'e': return 1;
                /* MSVC (but not clang-cl) doesn't support UTF-8 in char32_t
                   literals but it does it regular strings. Still a problem in
                   MSVC 2022, what a trash fire, can't you just give up on
                   those codepage insanities already, ffs?! */
                #if defined(CORRADE_TARGET_MSVC) && !defined(CORRADE_TARGET_CLANG)
                case U'\u011B':
                #else
                case U'ě':
                #endif
                    return 3;
            }

            return 0;
        }

        Vector2 doGlyphSize(UnsignedInt) override { return {}; }

        Vector2 doGlyphAdvance(const UnsignedInt glyph) override {
            switch(glyph) {
                case 0: return {8, 0};
                case 1:
                case 3: /* e and ě have the same advance */
                    return {12, 0};
                case 2: return {23, 0};
            }

            CORRADE_INTERNAL_ASSERT_UNREACHABLE(); /* LCOV_EXCL_LINE */
        }

        bool _opened = false;
};

void MagnumFontConverterTest::exportFont() {
    Containers::String confFilename = Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font.conf");
    Containers::String tgaFilename = Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font.tga");
    /* Remove previously created files */
    if(Utility::Path::exists(confFilename))
        CORRADE_VERIFY(Utility::Path::remove(confFilename));
    if(Utility::Path::exists(tgaFilename))
        CORRADE_VERIFY(Utility::Path::remove(tgaFilename));

    MyFont font;
    font.openFile({}, {});

    struct: AbstractGlyphCache {
        using AbstractGlyphCache::AbstractGlyphCache;

        GlyphCacheFeatures doFeatures() const override { return GlyphCacheFeature::ImageDownload; }
        void doSetImage(const Vector2i&, const ImageView2D&) override {}
        Image2D doImage() override {
            return Image2D{PixelFormat::R8Unorm, {8, 4}, Containers::Array<char>{InPlaceInit, {
                '0', '1', '2', '3', '4', '5', '6', '7',
                '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
                'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
                'o', 'p', 'q', 'r', 's', 't', 'u', 'v'
            }}};
        }
    } cache{{128, 64}, {16, 8}};
    /* Override the not found glyph to be in bounds as well */
    cache.insert(0, {}, {{16, 8}, {16, 8}});
    cache.insert(font.glyphId(U'W'), {25, 34}, {{16, 12}, {24, 56}});
    cache.insert(font.glyphId(U'e'), {25, 12}, {{36, 8}, {112, 40}});
    /* ě has deliberately the same glyph data as e */
    cache.insert(font.glyphId(
        /* MSVC (but not clang-cl) doesn't support UTF-8 in char32_t literals
           but it does it regular strings. Still a problem in MSVC 2022, what a
           trash fire, can't you just give up on those codepage insanities
           already, ffs?! */
        #if defined(CORRADE_TARGET_MSVC) && !defined(CORRADE_TARGET_CLANG)
        U'\u011B'
        #else
        U'ě'
        #endif
    ), {25, 12}, {{36, 8}, {112, 40}});

    /* Convert the file */
    Containers::Pointer<AbstractFontConverter> converter = _fontConverterManager.instantiate("MagnumFontConverter");
    CORRADE_VERIFY(converter->exportFontToFile(font, cache, Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font"), "Waveě"));

    /* Verify font parameters */
    CORRADE_COMPARE_AS(confFilename,
        Utility::Path::join(MAGNUMFONT_TEST_DIR, "font.conf"),
        TestSuite::Compare::File);

    if(!(_importerManager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_importerManager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found, not testing glyph cache contents");

    /* Verify font image */
    CORRADE_COMPARE_WITH(tgaFilename,
        Utility::Path::join(MAGNUMFONT_TEST_DIR, "font.tga"),
        DebugTools::CompareImageFile{_importerManager});
}

void MagnumFontConverterTest::exportFontEmptyCache() {
    Containers::String confFilename = Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font-empty-cache.conf");
    Containers::String tgaFilename = Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font-empty-cache.tga");
    /* Remove previously created files */
    if(Utility::Path::exists(confFilename))
        CORRADE_VERIFY(Utility::Path::remove(confFilename));
    if(Utility::Path::exists(tgaFilename))
        CORRADE_VERIFY(Utility::Path::remove(tgaFilename));

    MyFont font;
    font.openFile({}, {});

    struct: AbstractGlyphCache {
        using AbstractGlyphCache::AbstractGlyphCache;

        GlyphCacheFeatures doFeatures() const override { return GlyphCacheFeature::ImageDownload; }
        void doSetImage(const Vector2i&, const ImageView2D&) override {}
        Image2D doImage() override {
            return Image2D{PixelFormat::R8Unorm, {8, 4}, Containers::Array<char>{ValueInit, 8*4}};
        }
    } cache{{8, 4}};

    /* Convert the file */
    Containers::Pointer<AbstractFontConverter> converter = _fontConverterManager.instantiate("MagnumFontConverter");
    CORRADE_VERIFY(converter->exportFontToFile(font, cache, Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font-empty-cache"), "Wave"));

    /* Verify font parameters */
    CORRADE_COMPARE_AS(confFilename,
        Utility::Path::join(MAGNUMFONTCONVERTER_TEST_DIR, "font-empty-cache.conf"),
        TestSuite::Compare::File);

    if(!(_importerManager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_importerManager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found, not testing glyph cache contents");

    /* Verify font image */
    CORRADE_COMPARE_WITH(tgaFilename,
        Utility::Path::join(MAGNUMFONTCONVERTER_TEST_DIR, "font-empty-cache.tga"),
        DebugTools::CompareImageFile{_importerManager});
}

void MagnumFontConverterTest::exportFontNoGlyphCacheImageDownload() {
    struct: AbstractFont {
        /* Supports neither file nor data opening */
        FontFeatures doFeatures() const override { return {}; }
        bool doIsOpened() const override { return false; }
        void doClose() override {}

        UnsignedInt doGlyphId(char32_t) override { return {}; }
        Vector2 doGlyphSize(UnsignedInt) override { return {}; }
        Vector2 doGlyphAdvance(UnsignedInt) override { return {}; }
        Containers::Pointer<AbstractLayouter> doLayout(const AbstractGlyphCache&, Float, Containers::StringView) override {
            return nullptr;
        }
    } font;

    struct: AbstractGlyphCache {
        using AbstractGlyphCache::AbstractGlyphCache;

        GlyphCacheFeatures doFeatures() const override { return {}; }
        void doSetImage(const Vector2i&, const ImageView2D&) override {}
    } cache{{100, 100}};

    Containers::Pointer<AbstractFontConverter> converter = _fontConverterManager.instantiate("MagnumFontConverter");

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!converter->exportFontToFile(font, cache, Utility::Path::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font"), "Wave"));
    CORRADE_COMPARE(out.str(), "Text::MagnumFontConverter::exportFontToData(): passed glyph cache doesn't support image download\n");
}

}}}}

CORRADE_TEST_MAIN(Magnum::Text::Test::MagnumFontConverterTest)