#include <gtest/gtest.h>

#include "XCUIBackend/XCUIStandaloneTextAtlasProvider.h"

#include <cstdint>

namespace {

using XCEngine::Editor::XCUIBackend::IXCUITextAtlasProvider;
using XCEngine::Editor::XCUIBackend::XCUIStandaloneTextAtlasProvider;

TEST(XCUIStandaloneTextAtlasProviderTest, BuildsDefaultEditorAtlasWithoutImGuiContext) {
    XCUIStandaloneTextAtlasProvider provider = {};

    IXCUITextAtlasProvider::AtlasTextureView atlasView = {};
    ASSERT_TRUE(provider.IsReady());
    ASSERT_TRUE(provider.GetAtlasTextureView(IXCUITextAtlasProvider::PixelFormat::RGBA32, atlasView));
    EXPECT_TRUE(atlasView.IsValid());
    EXPECT_EQ(atlasView.format, IXCUITextAtlasProvider::PixelFormat::RGBA32);
    EXPECT_GT(provider.GetFontCount(), 0u);
}

TEST(XCUIStandaloneTextAtlasProviderTest, ExposesDefaultFontMetricsAndGlyphs) {
    XCUIStandaloneTextAtlasProvider provider = {};
    const IXCUITextAtlasProvider::FontHandle defaultFont = provider.GetDefaultFont();
    ASSERT_TRUE(defaultFont.IsValid());

    IXCUITextAtlasProvider::FontInfo fontInfo = {};
    ASSERT_TRUE(provider.GetFontInfo(defaultFont, fontInfo));
    EXPECT_GT(fontInfo.nominalSize, 0.0f);

    IXCUITextAtlasProvider::BakedFontInfo bakedFontInfo = {};
    ASSERT_TRUE(provider.GetBakedFontInfo(defaultFont, 0.0f, bakedFontInfo));
    EXPECT_GT(bakedFontInfo.lineHeight, 0.0f);
    EXPECT_GT(bakedFontInfo.rasterizerDensity, 0.0f);

    IXCUITextAtlasProvider::GlyphInfo glyphInfo = {};
    ASSERT_TRUE(provider.FindGlyph(defaultFont, 0.0f, static_cast<std::uint32_t>('A'), glyphInfo));
    EXPECT_EQ(glyphInfo.requestedCodepoint, static_cast<std::uint32_t>('A'));
    EXPECT_GT(glyphInfo.advanceX, 0.0f);
    EXPECT_GE(glyphInfo.u1, glyphInfo.u0);
    EXPECT_GE(glyphInfo.v1, glyphInfo.v0);
}

} // namespace