/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "minikin/FontCollection.h"

#include <gtest/gtest.h>

#include "FontTestUtils.h"
#include "MinikinInternal.h"

namespace minikin {

// The test font has following glyphs.
// U+82A6
// U+82A6 U+FE00 (VS1)
// U+82A6 U+E0100 (VS17)
// U+82A6 U+E0101 (VS18)
// U+82A6 U+E0102 (VS19)
// U+845B
// U+845B U+FE01 (VS2)
// U+845B U+E0101 (VS18)
// U+845B U+E0102 (VS19)
// U+845B U+E0103 (VS20)
// U+537F
// U+717D U+FE02 (VS3)
// U+717D U+E0102 (VS19)
// U+717D U+E0103 (VS20)
const char kVsTestFont[] = "VariationSelectorTest-Regular.ttf";

void expectVSGlyphs(const FontCollection* fc, uint32_t codepoint, const std::set<uint32_t>& vsSet) {
    for (uint32_t vs = 0xFE00; vs <= 0xE01EF; ++vs) {
        // Move to variation selectors supplements after variation selectors.
        if (vs == 0xFF00) {
            vs = 0xE0100;
        }
        if (vsSet.find(vs) == vsSet.end()) {
            EXPECT_FALSE(fc->hasVariationSelector(codepoint, vs))
                    << "Glyph for U+" << std::hex << codepoint << " U+" << vs;
        } else {
            EXPECT_TRUE(fc->hasVariationSelector(codepoint, vs))
                    << "Glyph for U+" << std::hex << codepoint << " U+" << vs;
        }
    }
}

TEST(FontCollectionTest, hasVariationSelectorTest) {
    auto fc = buildFontCollection(kVsTestFont);

    EXPECT_FALSE(fc->hasVariationSelector(0x82A6, 0));
    expectVSGlyphs(fc.get(), 0x82A6,
                   std::set<uint32_t>({0xFE00, 0xFE0E, 0xE0100, 0xE0101, 0xE0102}));

    EXPECT_FALSE(fc->hasVariationSelector(0x845B, 0));
    expectVSGlyphs(fc.get(), 0x845B,
                   std::set<uint32_t>({0xFE01, 0xFE0E, 0xE0101, 0xE0102, 0xE0103}));

    EXPECT_FALSE(fc->hasVariationSelector(0x537F, 0));
    expectVSGlyphs(fc.get(), 0x537F, std::set<uint32_t>({0xFE0E}));

    EXPECT_FALSE(fc->hasVariationSelector(0x717D, 0));
    expectVSGlyphs(fc.get(), 0x717D, std::set<uint32_t>({0xFE02, 0xE0102, 0xE0103}));
}

const char kEmojiXmlFile[] = "emoji.xml";

TEST(FontCollectionTest, hasVariationSelectorTest_emoji) {
    auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

    // Both text/color font have cmap format 14 subtable entry for VS15/VS16 respectively.
    EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0E));
    EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0F));

    // The text font has cmap format 14 subtable entry for VS15 but the color font doesn't have for
    // VS16
    EXPECT_TRUE(collection->hasVariationSelector(0x2626, 0xFE0E));
    EXPECT_FALSE(collection->hasVariationSelector(0x2626, 0xFE0F));

    // The color font has cmap format 14 subtable entry for VS16 but the text font doesn't have for
    // VS15.
    EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0E));
    EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0F));

    // Neither text/color font have cmap format 14 subtable entry for VS15/VS16.
    EXPECT_TRUE(collection->hasVariationSelector(0x262E, 0xFE0E));
    EXPECT_FALSE(collection->hasVariationSelector(0x262E, 0xFE0F));

    // Text font doesn't support U+1F3FD. Only the color emoji fonts has. So VS15 is not supported.
    EXPECT_FALSE(collection->hasVariationSelector(0x1F3FD, 0xFE0E));

    // Text font doesn't have U+262F U+FE0E or even its base code point U+262F.
    EXPECT_FALSE(collection->hasVariationSelector(0x262F, 0xFE0E));

    // None of the fonts support U+2229.
    EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0E));
    EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0F));
}

TEST(FontCollectionTest, newEmojiTest) {
    auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

    // U+2695, U+2640, U+2642 are not in emoji catrgory in Unicode 9 but they are now in emoji
    // category. Should return true even if U+FE0E was appended.
    // These three emojis are only avalilable in TextEmoji.ttf but U+2695 is excluded here since it
    // is used in other tests.
    EXPECT_TRUE(collection->hasVariationSelector(0x2640, 0xFE0E));
    EXPECT_FALSE(collection->hasVariationSelector(0x2640, 0xFE0F));
    EXPECT_TRUE(collection->hasVariationSelector(0x2642, 0xFE0E));
    EXPECT_FALSE(collection->hasVariationSelector(0x2642, 0xFE0F));
}

TEST(FontCollectionTest, createWithVariations) {
    // This font has 'wdth' and 'wght' axes.
    const char kMultiAxisFont[] = "MultiAxis.ttf";
    const char kNoAxisFont[] = "Regular.ttf";

    std::shared_ptr<FontCollection> multiAxisFc = buildFontCollection(kMultiAxisFont);
    std::shared_ptr<FontCollection> noAxisFc = buildFontCollection(kNoAxisFont);

    {
        // Do not ceate new instance if none of variations are specified.
        EXPECT_EQ(nullptr,
                  multiAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
        EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
    }
    {
        // New instance should be used for supported variation.
        std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f}};
        std::shared_ptr<FontCollection> newFc(
                multiAxisFc->createCollectionWithVariation(variations));
        EXPECT_NE(nullptr, newFc.get());
        EXPECT_NE(multiAxisFc.get(), newFc.get());

        EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
    }
    {
        // New instance should be used for supported variation (multiple variations case).
        std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
                                                 {MinikinFont::MakeTag('w', 'g', 'h', 't'), 1.0f}};
        std::shared_ptr<FontCollection> newFc(
                multiAxisFc->createCollectionWithVariation(variations));
        EXPECT_NE(nullptr, newFc.get());
        EXPECT_NE(multiAxisFc.get(), newFc.get());

        EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
    }
    {
        // Do not ceate new instance if none of variations are supported.
        std::vector<FontVariation> variations = {{MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
        EXPECT_EQ(nullptr, multiAxisFc->createCollectionWithVariation(variations));
        EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
    }
    {
        // At least one axis is supported, should create new instance.
        std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
                                                 {MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
        std::shared_ptr<FontCollection> newFc(
                multiAxisFc->createCollectionWithVariation(variations));
        EXPECT_NE(nullptr, newFc.get());
        EXPECT_NE(multiAxisFc.get(), newFc.get());

        EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
    }
}

}  // namespace minikin