/*
 * 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 <gtest/gtest.h>

#include <minikin/FontFamily.h>

#include <cutils/log.h>

#include "FontLanguageListCache.h"
#include "ICUTestBase.h"
#include "MinikinFontForTest.h"
#include "MinikinInternal.h"

namespace android {

typedef ICUTestBase FontLanguagesTest;
typedef ICUTestBase FontLanguageTest;

static FontLanguages createFontLanguages(const std::string& input) {
    AutoMutex _l(gMinikinLock);
    uint32_t langId = FontLanguageListCache::getId(input);
    return FontLanguageListCache::getById(langId);
}

static FontLanguage createFontLanguage(const std::string& input) {
    AutoMutex _l(gMinikinLock);
    uint32_t langId = FontLanguageListCache::getId(input);
    return FontLanguageListCache::getById(langId)[0];
}

TEST_F(FontLanguageTest, basicTests) {
    FontLanguage defaultLang;
    FontLanguage emptyLang("", 0);
    FontLanguage english = createFontLanguage("en");
    FontLanguage french = createFontLanguage("fr");
    FontLanguage und = createFontLanguage("und");
    FontLanguage undZsye = createFontLanguage("und-Zsye");

    EXPECT_EQ(english, english);
    EXPECT_EQ(french, french);

    EXPECT_TRUE(defaultLang != defaultLang);
    EXPECT_TRUE(emptyLang != emptyLang);
    EXPECT_TRUE(defaultLang != emptyLang);
    EXPECT_TRUE(defaultLang != und);
    EXPECT_TRUE(emptyLang != und);
    EXPECT_TRUE(english != defaultLang);
    EXPECT_TRUE(english != emptyLang);
    EXPECT_TRUE(english != french);
    EXPECT_TRUE(english != undZsye);
    EXPECT_TRUE(und != undZsye);
    EXPECT_TRUE(english != und);

    EXPECT_TRUE(defaultLang.isUnsupported());
    EXPECT_TRUE(emptyLang.isUnsupported());

    EXPECT_FALSE(english.isUnsupported());
    EXPECT_FALSE(french.isUnsupported());
    EXPECT_FALSE(und.isUnsupported());
    EXPECT_FALSE(undZsye.isUnsupported());
}

TEST_F(FontLanguageTest, getStringTest) {
    EXPECT_EQ("en-Latn", createFontLanguage("en").getString());
    EXPECT_EQ("en-Latn", createFontLanguage("en-Latn").getString());

    // Capitalized language code or lowercased script should be normalized.
    EXPECT_EQ("en-Latn", createFontLanguage("EN-LATN").getString());
    EXPECT_EQ("en-Latn", createFontLanguage("EN-latn").getString());
    EXPECT_EQ("en-Latn", createFontLanguage("en-latn").getString());

    // Invalid script should be kept.
    EXPECT_EQ("en-Xyzt", createFontLanguage("en-xyzt").getString());

    EXPECT_EQ("en-Latn", createFontLanguage("en-Latn-US").getString());
    EXPECT_EQ("ja-Jpan", createFontLanguage("ja").getString());
    EXPECT_EQ("und", createFontLanguage("und").getString());
    EXPECT_EQ("und", createFontLanguage("UND").getString());
    EXPECT_EQ("und", createFontLanguage("Und").getString());
    EXPECT_EQ("und-Zsye", createFontLanguage("und-Zsye").getString());
    EXPECT_EQ("und-Zsye", createFontLanguage("Und-ZSYE").getString());
    EXPECT_EQ("und-Zsye", createFontLanguage("Und-zsye").getString());

    EXPECT_EQ("de-Latn", createFontLanguage("de-1901").getString());

    // This is not a necessary desired behavior, just known behavior.
    EXPECT_EQ("en-Latn", createFontLanguage("und-Abcdefgh").getString());
}

TEST_F(FontLanguageTest, ScriptEqualTest) {
    EXPECT_TRUE(createFontLanguage("en").isEqualScript(createFontLanguage("en")));
    EXPECT_TRUE(createFontLanguage("en-Latn").isEqualScript(createFontLanguage("en")));
    EXPECT_TRUE(createFontLanguage("jp-Latn").isEqualScript(createFontLanguage("en-Latn")));
    EXPECT_TRUE(createFontLanguage("en-Jpan").isEqualScript(createFontLanguage("en-Jpan")));

    EXPECT_FALSE(createFontLanguage("en-Jpan").isEqualScript(createFontLanguage("en-Hira")));
    EXPECT_FALSE(createFontLanguage("en-Jpan").isEqualScript(createFontLanguage("en-Hani")));
}

TEST_F(FontLanguageTest, ScriptMatchTest) {
    const bool SUPPORTED = true;
    const bool NOT_SUPPORTED = false;

    struct TestCase {
        const std::string baseScript;
        const std::string requestedScript;
        bool isSupported;
    } testCases[] = {
        // Same scripts
        { "en-Latn", "Latn", SUPPORTED },
        { "ja-Jpan", "Jpan", SUPPORTED },
        { "ja-Hira", "Hira", SUPPORTED },
        { "ja-Kana", "Kana", SUPPORTED },
        { "ja-Hrkt", "Hrkt", SUPPORTED },
        { "zh-Hans", "Hans", SUPPORTED },
        { "zh-Hant", "Hant", SUPPORTED },
        { "zh-Hani", "Hani", SUPPORTED },
        { "ko-Kore", "Kore", SUPPORTED },
        { "ko-Hang", "Hang", SUPPORTED },

        // Japanese supports Hiragana, Katakanara, etc.
        { "ja-Jpan", "Hira", SUPPORTED },
        { "ja-Jpan", "Kana", SUPPORTED },
        { "ja-Jpan", "Hrkt", SUPPORTED },
        { "ja-Hrkt", "Hira", SUPPORTED },
        { "ja-Hrkt", "Kana", SUPPORTED },

        // Chinese supports Han.
        { "zh-Hans", "Hani", SUPPORTED },
        { "zh-Hant", "Hani", SUPPORTED },

        // Korean supports Hangul.
        { "ko-Kore", "Hang", SUPPORTED },

        // Different scripts
        { "ja-Jpan", "Latn", NOT_SUPPORTED },
        { "en-Latn", "Jpan", NOT_SUPPORTED },
        { "ja-Jpan", "Hant", NOT_SUPPORTED },
        { "zh-Hant", "Jpan", NOT_SUPPORTED },
        { "ja-Jpan", "Hans", NOT_SUPPORTED },
        { "zh-Hans", "Jpan", NOT_SUPPORTED },
        { "ja-Jpan", "Kore", NOT_SUPPORTED },
        { "ko-Kore", "Jpan", NOT_SUPPORTED },
        { "zh-Hans", "Hant", NOT_SUPPORTED },
        { "zh-Hant", "Hans", NOT_SUPPORTED },
        { "zh-Hans", "Kore", NOT_SUPPORTED },
        { "ko-Kore", "Hans", NOT_SUPPORTED },
        { "zh-Hant", "Kore", NOT_SUPPORTED },
        { "ko-Kore", "Hant", NOT_SUPPORTED },

        // Hiragana doesn't support Japanese, etc.
        { "ja-Hira", "Jpan", NOT_SUPPORTED },
        { "ja-Kana", "Jpan", NOT_SUPPORTED },
        { "ja-Hrkt", "Jpan", NOT_SUPPORTED },
        { "ja-Hani", "Jpan", NOT_SUPPORTED },
        { "ja-Hira", "Hrkt", NOT_SUPPORTED },
        { "ja-Kana", "Hrkt", NOT_SUPPORTED },
        { "ja-Hani", "Hrkt", NOT_SUPPORTED },
        { "ja-Hani", "Hira", NOT_SUPPORTED },
        { "ja-Hani", "Kana", NOT_SUPPORTED },

        // Kanji doesn't support Chinese, etc.
        { "zh-Hani", "Hant", NOT_SUPPORTED },
        { "zh-Hani", "Hans", NOT_SUPPORTED },

        // Hangul doesn't support Korean, etc.
        { "ko-Hang", "Kore", NOT_SUPPORTED },
        { "ko-Hani", "Kore", NOT_SUPPORTED },
        { "ko-Hani", "Hang", NOT_SUPPORTED },
        { "ko-Hang", "Hani", NOT_SUPPORTED },
    };

    for (auto testCase : testCases) {
        hb_script_t script = hb_script_from_iso15924_tag(
                HB_TAG(testCase.requestedScript[0], testCase.requestedScript[1],
                       testCase.requestedScript[2], testCase.requestedScript[3]));
        if (testCase.isSupported) {
            EXPECT_TRUE(
                    createFontLanguage(testCase.baseScript).supportsHbScript(script))
                    << testCase.baseScript << " should support " << testCase.requestedScript;
        } else {
            EXPECT_FALSE(
                    createFontLanguage(testCase.baseScript).supportsHbScript(script))
                    << testCase.baseScript << " shouldn't support " << testCase.requestedScript;
        }
    }
}

TEST_F(FontLanguagesTest, basicTests) {
    FontLanguages emptyLangs;
    EXPECT_EQ(0u, emptyLangs.size());

    FontLanguage english = createFontLanguage("en");
    FontLanguages singletonLangs = createFontLanguages("en");
    EXPECT_EQ(1u, singletonLangs.size());
    EXPECT_EQ(english, singletonLangs[0]);

    FontLanguage french = createFontLanguage("fr");
    FontLanguages twoLangs = createFontLanguages("en,fr");
    EXPECT_EQ(2u, twoLangs.size());
    EXPECT_EQ(english, twoLangs[0]);
    EXPECT_EQ(french, twoLangs[1]);
}

TEST_F(FontLanguagesTest, unsupportedLanguageTests) {
    FontLanguage unsupportedLang = createFontLanguage("abcd");
    ASSERT_TRUE(unsupportedLang.isUnsupported());

    FontLanguages oneUnsupported = createFontLanguages("abcd-example");
    EXPECT_EQ(1u, oneUnsupported.size());
    EXPECT_TRUE(oneUnsupported[0].isUnsupported());

    FontLanguages twoUnsupporteds = createFontLanguages("abcd-example,abcd-example");
    EXPECT_EQ(1u, twoUnsupporteds.size());
    EXPECT_TRUE(twoUnsupporteds[0].isUnsupported());

    FontLanguage english = createFontLanguage("en");
    FontLanguages firstUnsupported = createFontLanguages("abcd-example,en");
    EXPECT_EQ(1u, firstUnsupported.size());
    EXPECT_EQ(english, firstUnsupported[0]);

    FontLanguages lastUnsupported = createFontLanguages("en,abcd-example");
    EXPECT_EQ(1u, lastUnsupported.size());
    EXPECT_EQ(english, lastUnsupported[0]);
}

TEST_F(FontLanguagesTest, repeatedLanguageTests) {
    FontLanguage english = createFontLanguage("en");
    FontLanguage french = createFontLanguage("fr");
    FontLanguage englishInLatn = createFontLanguage("en-Latn");
    ASSERT_TRUE(english == englishInLatn);

    FontLanguages langs = createFontLanguages("en,en-Latn");
    EXPECT_EQ(1u, langs.size());
    EXPECT_EQ(english, langs[0]);

    // Country codes are ignored.
    FontLanguages fr = createFontLanguages("fr,fr-CA,fr-FR");
    EXPECT_EQ(1u, fr.size());
    EXPECT_EQ(french, fr[0]);

    // The order should be kept.
    langs = createFontLanguages("en,fr,en-Latn");
    EXPECT_EQ(2u, langs.size());
    EXPECT_EQ(english, langs[0]);
    EXPECT_EQ(french, langs[1]);
}

TEST_F(FontLanguagesTest, undEmojiTests) {
    FontLanguage emoji = createFontLanguage("und-Zsye");
    EXPECT_TRUE(emoji.hasEmojiFlag());

    FontLanguage und = createFontLanguage("und");
    EXPECT_FALSE(und.hasEmojiFlag());
    EXPECT_FALSE(emoji == und);

    FontLanguage undExample = createFontLanguage("und-example");
    EXPECT_FALSE(undExample.hasEmojiFlag());
    EXPECT_FALSE(emoji == undExample);
}

TEST_F(FontLanguagesTest, registerLanguageListTest) {
    EXPECT_EQ(0UL, FontStyle::registerLanguageList(""));
    EXPECT_NE(0UL, FontStyle::registerLanguageList("en"));
    EXPECT_NE(0UL, FontStyle::registerLanguageList("jp"));
    EXPECT_NE(0UL, FontStyle::registerLanguageList("en,zh-Hans"));

    EXPECT_EQ(FontStyle::registerLanguageList("en"), FontStyle::registerLanguageList("en"));
    EXPECT_NE(FontStyle::registerLanguageList("en"), FontStyle::registerLanguageList("jp"));

    EXPECT_EQ(FontStyle::registerLanguageList("en,zh-Hans"),
              FontStyle::registerLanguageList("en,zh-Hans"));
    EXPECT_NE(FontStyle::registerLanguageList("en,zh-Hans"),
              FontStyle::registerLanguageList("zh-Hans,en"));
    EXPECT_NE(FontStyle::registerLanguageList("en,zh-Hans"),
              FontStyle::registerLanguageList("jp"));
    EXPECT_NE(FontStyle::registerLanguageList("en,zh-Hans"),
              FontStyle::registerLanguageList("en"));
    EXPECT_NE(FontStyle::registerLanguageList("en,zh-Hans"),
              FontStyle::registerLanguageList("en,zh-Hant"));
}

// 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+FE00 (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[] = kTestFontDir "VarioationSelectorTest-Regular.ttf";

class FontFamilyTest : public ICUTestBase {
public:
    virtual void SetUp() override {
        ICUTestBase::SetUp();
        if (access(kVsTestFont, R_OK) != 0) {
            FAIL() << "Unable to read " << kVsTestFont << ". "
                   << "Please prepare the test data directory. "
                   << "For more details, please see how_to_run.txt.";
        }
    }
};

// Asserts that the font family has glyphs for and only for specified codepoint
// and variationSelector pairs.
void expectVSGlyphs(FontFamily* family, uint32_t codepoint, const std::set<uint32_t>& vs) {
    for (uint32_t i = 0xFE00; i <= 0xE01EF; ++i) {
        // Move to variation selectors supplements after variation selectors.
        if (i == 0xFF00) {
            i = 0xE0100;
        }
        if (vs.find(i) == vs.end()) {
            EXPECT_FALSE(family->hasVariationSelector(codepoint, i))
                    << "Glyph for U+" << std::hex << codepoint << " U+" << i;
        } else {
            EXPECT_TRUE(family->hasVariationSelector(codepoint, i))
                    << "Glyph for U+" << std::hex << codepoint << " U+" << i;
        }

    }
}

TEST_F(FontFamilyTest, hasVariationSelectorTest) {
    MinikinFontForTest minikinFont(kVsTestFont);
    FontFamily family;
    family.addFont(&minikinFont);

    AutoMutex _l(gMinikinLock);

    const uint32_t kVS1 = 0xFE00;
    const uint32_t kVS2 = 0xFE01;
    const uint32_t kVS3 = 0xFE02;
    const uint32_t kVS17 = 0xE0100;
    const uint32_t kVS18 = 0xE0101;
    const uint32_t kVS19 = 0xE0102;
    const uint32_t kVS20 = 0xE0103;

    const uint32_t kSupportedChar1 = 0x82A6;
    EXPECT_TRUE(family.getCoverage()->get(kSupportedChar1));
    expectVSGlyphs(&family, kSupportedChar1, std::set<uint32_t>({kVS1, kVS17, kVS18, kVS19}));

    const uint32_t kSupportedChar2 = 0x845B;
    EXPECT_TRUE(family.getCoverage()->get(kSupportedChar2));
    expectVSGlyphs(&family, kSupportedChar2, std::set<uint32_t>({kVS2, kVS18, kVS19, kVS20}));

    const uint32_t kNoVsSupportedChar = 0x537F;
    EXPECT_TRUE(family.getCoverage()->get(kNoVsSupportedChar));
    expectVSGlyphs(&family, kNoVsSupportedChar, std::set<uint32_t>());

    const uint32_t kVsOnlySupportedChar = 0x717D;
    EXPECT_FALSE(family.getCoverage()->get(kVsOnlySupportedChar));
    expectVSGlyphs(&family, kVsOnlySupportedChar, std::set<uint32_t>({kVS3, kVS19, kVS20}));

    const uint32_t kNotSupportedChar = 0x845C;
    EXPECT_FALSE(family.getCoverage()->get(kNotSupportedChar));
    expectVSGlyphs(&family, kNotSupportedChar, std::set<uint32_t>());
}

TEST_F(FontFamilyTest, hasVariationSelectorWorksAfterpurgeHbFontCache) {
    MinikinFontForTest minikinFont(kVsTestFont);
    FontFamily family;
    family.addFont(&minikinFont);

    const uint32_t kVS1 = 0xFE00;
    const uint32_t kSupportedChar1 = 0x82A6;

    AutoMutex _l(gMinikinLock);
    EXPECT_TRUE(family.hasVariationSelector(kSupportedChar1, kVS1));

    family.purgeHbFontCache();
    EXPECT_TRUE(family.hasVariationSelector(kSupportedChar1, kVS1));
}
}  // namespace android