// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "sky/engine/config.h"
#include "sky/engine/platform/fonts/GlyphPageTreeNode.h"

#include <gtest/gtest.h>
#include "sky/engine/platform/fonts/SegmentedFontData.h"
#include "sky/engine/platform/fonts/SimpleFontData.h"

namespace blink {

class TestCustomFontData : public CustomFontData {
public:
    static PassRefPtr<TestCustomFontData> create() { return adoptRef(new TestCustomFontData()); }
private:
    TestCustomFontData() { }
    virtual bool isLoadingFallback() const override { return true; }
};

class TestSimpleFontData : public SimpleFontData {
public:
    static PassRefPtr<TestSimpleFontData> create(UChar32 from, UChar32 to)
    {
        return adoptRef(new TestSimpleFontData(nullptr, from, to));
    }

    static PassRefPtr<TestSimpleFontData> createUnloaded(UChar32 from, UChar32 to)
    {
        return adoptRef(new TestSimpleFontData(TestCustomFontData::create(), from, to));
    }

private:
    TestSimpleFontData(PassRefPtr<CustomFontData> customData, UChar32 from, UChar32 to)
        : SimpleFontData(customData, 10, false, false)
        , m_from(from)
        , m_to(to)
    {
    }

    bool fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength) const override
    {
        const Glyph kGlyph = 1;
        String bufferString(buffer, bufferLength);
        unsigned bufferIndex = 0;
        bool hasGlyphs = false;
        for (unsigned i = 0; i < length; i++) {
            UChar32 c = bufferString.characterStartingAt(bufferIndex);
            bufferIndex += U16_LENGTH(c);
            if (m_from <= c && c <= m_to) {
                pageToFill->setGlyphDataForIndex(offset + i, kGlyph, this);
                hasGlyphs = true;
            }
        }
        return hasGlyphs;
    }

    UChar32 m_from;
    UChar32 m_to;
};

TEST(GlyphPageTreeNode, rootChild)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> data = TestSimpleFontData::create('a', 'z');
        GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(data.get(), kPageNumber);
        EXPECT_EQ(pageCountBeforeTest + 1, GlyphPageTreeNode::treeGlyphPageCount());
        EXPECT_TRUE(node->page()->glyphAt('a'));
        EXPECT_FALSE(node->page()->glyphAt('A'));
        EXPECT_FALSE(node->isSystemFallback());
        EXPECT_EQ(1u, node->level());
        EXPECT_EQ(node, node->page()->owner());
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, level2)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> dataAtoC = TestSimpleFontData::create('A', 'C');
        RefPtr<TestSimpleFontData> dataCtoE = TestSimpleFontData::create('C', 'E');
        GlyphPageTreeNode* node1 = GlyphPageTreeNode::getRootChild(dataAtoC.get(), kPageNumber);
        GlyphPageTreeNode* node2 = node1->getChild(dataCtoE.get(), kPageNumber);
        EXPECT_EQ(pageCountBeforeTest + 3, GlyphPageTreeNode::treeGlyphPageCount());

        EXPECT_EQ(2u, node2->level());
        EXPECT_EQ(dataAtoC, node2->page()->glyphDataForCharacter('A').fontData);
        EXPECT_EQ(dataAtoC, node2->page()->glyphDataForCharacter('C').fontData);
        EXPECT_EQ(dataCtoE, node2->page()->glyphDataForCharacter('E').fontData);
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, segmentedData)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> dataBtoC = TestSimpleFontData::create('B', 'C');
        RefPtr<TestSimpleFontData> dataCtoE = TestSimpleFontData::create('C', 'E');
        RefPtr<SegmentedFontData> segmentedData = SegmentedFontData::create();
        segmentedData->appendRange(FontDataRange('A', 'C', dataBtoC));
        segmentedData->appendRange(FontDataRange('C', 'D', dataCtoE));
        GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(segmentedData.get(), kPageNumber);

        EXPECT_EQ(0, node->page()->glyphDataForCharacter('A').fontData);
        EXPECT_EQ(dataBtoC, node->page()->glyphDataForCharacter('B').fontData);
        EXPECT_EQ(dataBtoC, node->page()->glyphDataForCharacter('C').fontData);
        EXPECT_EQ(dataCtoE, node->page()->glyphDataForCharacter('D').fontData);
        EXPECT_EQ(0, node->page()->glyphDataForCharacter('E').fontData);
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, outsideBMP)
{
    const unsigned kPageNumber = 0x1f300 / GlyphPage::size;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> data = TestSimpleFontData::create(0x1f310, 0x1f320);
        GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(data.get(), kPageNumber);
        EXPECT_EQ(pageCountBeforeTest + 1, GlyphPageTreeNode::treeGlyphPageCount());
        EXPECT_FALSE(node->page()->glyphForCharacter(0x1f30f));
        EXPECT_TRUE(node->page()->glyphForCharacter(0x1f310));
        EXPECT_TRUE(node->page()->glyphForCharacter(0x1f320));
        EXPECT_FALSE(node->page()->glyphForCharacter(0x1f321));
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, customData)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> dataAtoC = TestSimpleFontData::createUnloaded('A', 'C');
        RefPtr<TestSimpleFontData> dataBtoD = TestSimpleFontData::create('B', 'D');
        RefPtr<TestSimpleFontData> dataCtoE = TestSimpleFontData::createUnloaded('C', 'E');
        RefPtr<SegmentedFontData> segmentedData = SegmentedFontData::create();
        segmentedData->appendRange(FontDataRange('A', 'C', dataAtoC));
        segmentedData->appendRange(FontDataRange('B', 'D', dataBtoD));
        segmentedData->appendRange(FontDataRange('C', 'E', dataCtoE));
        GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(segmentedData.get(), kPageNumber);

        EXPECT_EQ(0, node->page()->glyphDataForCharacter('A').fontData);
        EXPECT_EQ(dataBtoD, node->page()->glyphDataForCharacter('B').fontData);
        EXPECT_EQ(dataBtoD, node->page()->glyphDataForCharacter('C').fontData);
        EXPECT_EQ(dataBtoD, node->page()->glyphDataForCharacter('D').fontData);
        EXPECT_EQ(0, node->page()->glyphDataForCharacter('E').fontData);

        EXPECT_EQ(dataAtoC->customFontData(), node->page()->customFontToLoadAt('A'));
        EXPECT_EQ(dataAtoC->customFontData(), node->page()->customFontToLoadAt('B'));
        EXPECT_EQ(dataAtoC->customFontData(), node->page()->customFontToLoadAt('C'));
        EXPECT_EQ(0, node->page()->customFontToLoadAt('D'));
        EXPECT_EQ(dataCtoE->customFontData(), node->page()->customFontToLoadAt('E'));
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, customDataWithMultiplePages)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> dataAtoC = TestSimpleFontData::createUnloaded('A', 'C');
        RefPtr<TestSimpleFontData> dataBtoD = TestSimpleFontData::create('B', 'D');
        RefPtr<TestSimpleFontData> dataCtoE = TestSimpleFontData::createUnloaded('C', 'E');
        RefPtr<SegmentedFontData> segmentedData1 = SegmentedFontData::create();
        RefPtr<SegmentedFontData> segmentedData2 = SegmentedFontData::create();
        RefPtr<SegmentedFontData> segmentedData3 = SegmentedFontData::create();
        segmentedData1->appendRange(FontDataRange('A', 'C', dataAtoC));
        segmentedData2->appendRange(FontDataRange('B', 'D', dataBtoD));
        segmentedData3->appendRange(FontDataRange('C', 'E', dataCtoE));
        GlyphPageTreeNode* node1 = GlyphPageTreeNode::getRootChild(segmentedData1.get(), kPageNumber);
        GlyphPageTreeNode* node2 = node1->getChild(segmentedData2.get(), kPageNumber);
        GlyphPageTreeNode* node3 = node2->getChild(segmentedData3.get(), kPageNumber);

        EXPECT_EQ(0, node3->page()->glyphDataForCharacter('A').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('B').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('C').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('D').fontData);
        EXPECT_EQ(0, node3->page()->glyphDataForCharacter('E').fontData);

        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('A'));
        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('B'));
        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('C'));
        EXPECT_EQ(0, node3->page()->customFontToLoadAt('D'));
        EXPECT_EQ(dataCtoE->customFontData(), node3->page()->customFontToLoadAt('E'));
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

TEST(GlyphPageTreeNode, systemFallback)
{
    const unsigned kPageNumber = 0;
    size_t pageCountBeforeTest = GlyphPageTreeNode::treeGlyphPageCount();
    {
        RefPtr<TestSimpleFontData> dataAtoC = TestSimpleFontData::createUnloaded('A', 'C');
        RefPtr<TestSimpleFontData> dataBtoD = TestSimpleFontData::create('B', 'D');
        RefPtr<SegmentedFontData> segmentedData = SegmentedFontData::create();
        segmentedData->appendRange(FontDataRange('A', 'C', dataAtoC));
        GlyphPageTreeNode* node1 = GlyphPageTreeNode::getRootChild(segmentedData.get(), kPageNumber);
        GlyphPageTreeNode* node2 = node1->getChild(dataBtoD.get(), kPageNumber);
        GlyphPageTreeNode* node3 = node2->getChild(0, kPageNumber);

        EXPECT_TRUE(node3->isSystemFallback());

        EXPECT_EQ(0, node3->page()->glyphDataForCharacter('A').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('B').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('C').fontData);
        EXPECT_EQ(dataBtoD, node3->page()->glyphDataForCharacter('D').fontData);

        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('A'));
        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('B'));
        EXPECT_EQ(dataAtoC->customFontData(), node3->page()->customFontToLoadAt('C'));
        EXPECT_EQ(0, node3->page()->customFontToLoadAt('D'));
    }
    EXPECT_EQ(pageCountBeforeTest, GlyphPageTreeNode::treeGlyphPageCount());
}

} // namespace blink