#include <gtest/gtest.h>

#include "XCUIBackend/XCUILayoutLabRuntime.h"

#include <XCEngine/UI/Types.h>

#include <string>
#include <vector>

namespace {

using XCEngine::UI::UIDrawCommand;
using XCEngine::UI::UIDrawCommandType;

XCEngine::Editor::XCUIBackend::XCUILayoutLabInputState BuildInputState(
    float width = 960.0f,
    float height = 640.0f) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabInputState input = {};
    input.canvasRect = XCEngine::UI::UIRect(0.0f, 0.0f, width, height);
    input.pointerPosition = XCEngine::UI::UIPoint(width * 0.5f, height * 0.5f);
    input.pointerInside = true;
    return input;
}

std::vector<const UIDrawCommand*> CollectTextCommands(const XCEngine::UI::UIDrawData& drawData) {
    std::vector<const UIDrawCommand*> textCommands = {};
    for (const XCEngine::UI::UIDrawList& drawList : drawData.GetDrawLists()) {
        for (const UIDrawCommand& command : drawList.GetCommands()) {
            if (command.type == UIDrawCommandType::Text) {
                textCommands.push_back(&command);
            }
        }
    }
    return textCommands;
}

const UIDrawCommand* FindTextCommand(
    const XCEngine::UI::UIDrawData& drawData,
    const std::string& text) {
    for (const XCEngine::UI::UIDrawList& drawList : drawData.GetDrawLists()) {
        for (const UIDrawCommand& command : drawList.GetCommands()) {
            if (command.type == UIDrawCommandType::Text && command.text == text) {
                return &command;
            }
        }
    }
    return nullptr;
}

std::size_t CountCommandsOfType(
    const XCEngine::UI::UIDrawData& drawData,
    UIDrawCommandType type) {
    std::size_t count = 0;
    for (const XCEngine::UI::UIDrawList& drawList : drawData.GetDrawLists()) {
        for (const UIDrawCommand& command : drawList.GetCommands()) {
            if (command.type == type) {
                ++count;
            }
        }
    }
    return count;
}

} // namespace

TEST(NewEditorXCUILayoutLabRuntimeTest, UpdateBuildsLayoutSmokeFrame) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabRuntime runtime;
    const bool reloadSucceeded = runtime.ReloadDocuments();

    const auto& frame = runtime.Update(BuildInputState());
    EXPECT_EQ(frame.stats.documentsReady, reloadSucceeded);
    EXPECT_EQ(frame.stats.drawListCount, frame.drawData.GetDrawListCount());
    EXPECT_EQ(frame.stats.commandCount, frame.drawData.GetTotalCommandCount());

    if (frame.stats.documentsReady) {
        EXPECT_GT(frame.stats.drawListCount, 0u);
        EXPECT_GT(frame.stats.commandCount, 0u);
        EXPECT_GE(frame.stats.rowCount, 1u);
        EXPECT_GE(frame.stats.columnCount, 1u);
        EXPECT_GE(frame.stats.overlayCount, 1u);
        EXPECT_GE(frame.stats.scrollViewCount, 2u);

        XCEngine::UI::UIRect heroRect = {};
        EXPECT_TRUE(runtime.TryGetElementRect("heroCard", heroRect));
        EXPECT_GT(heroRect.width, 0.0f);
        EXPECT_GT(heroRect.height, 0.0f);
    } else {
        EXPECT_FALSE(frame.stats.statusMessage.empty());
    }
}

TEST(NewEditorXCUILayoutLabRuntimeTest, FrameIncludesTextCommandsWithThemeFontSizes) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& frame = runtime.Update(BuildInputState());
    ASSERT_TRUE(frame.stats.documentsReady);

    const std::vector<const UIDrawCommand*> textCommands = CollectTextCommands(frame.drawData);
    ASSERT_FALSE(textCommands.empty());

    for (const UIDrawCommand* command : textCommands) {
        ASSERT_NE(command, nullptr);
        EXPECT_FALSE(command->text.empty());
        EXPECT_GT(command->fontSize, 0.0f);
    }

    const UIDrawCommand* titleCommand = FindTextCommand(frame.drawData, "XCUI Layout Lab");
    ASSERT_NE(titleCommand, nullptr);
    EXPECT_FLOAT_EQ(titleCommand->fontSize, 16.0f);

    const UIDrawCommand* subtitleCommand = FindTextCommand(
        frame.drawData,
        "Editor-style panels with overlay and scroll semantics.");
    ASSERT_NE(subtitleCommand, nullptr);
    EXPECT_FLOAT_EQ(subtitleCommand->fontSize, 13.0f);
}

TEST(NewEditorXCUILayoutLabRuntimeTest, HoverProbeResolvesTrackedElementRect) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baseline = runtime.Update(BuildInputState());
    ASSERT_TRUE(baseline.stats.documentsReady);

    XCEngine::UI::UIRect probeRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("assetLighting", probeRect));
    ASSERT_GT(probeRect.width, 0.0f);
    ASSERT_GT(probeRect.height, 0.0f);

    XCEngine::Editor::XCUIBackend::XCUILayoutLabInputState input = BuildInputState();
    input.pointerPosition = XCEngine::UI::UIPoint(
        probeRect.x + probeRect.width * 0.5f,
        probeRect.y + probeRect.height * 0.5f);
    const auto& frame = runtime.Update(input);

    ASSERT_TRUE(frame.stats.documentsReady);
    EXPECT_FALSE(frame.stats.hoveredElementId.empty());

    XCEngine::UI::UIRect hoveredRect = {};
    EXPECT_TRUE(runtime.TryGetElementRect(frame.stats.hoveredElementId, hoveredRect));
    EXPECT_GT(hoveredRect.width, 0.0f);
    EXPECT_GT(hoveredRect.height, 0.0f);
}

TEST(NewEditorXCUILayoutLabRuntimeTest, ScrollViewOffsetsContentAndAddsNestedClips) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& frame = runtime.Update(BuildInputState());
    ASSERT_TRUE(frame.stats.documentsReady);

    XCEngine::UI::UIRect assetListRect = {};
    XCEngine::UI::UIRect headerRect = {};
    XCEngine::UI::UIRect visibleItemRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("assetList", assetListRect));
    ASSERT_TRUE(runtime.TryGetElementRect("assetListHeader", headerRect));
    ASSERT_TRUE(runtime.TryGetElementRect("assetLighting", visibleItemRect));

    EXPECT_LT(headerRect.y, assetListRect.y);
    EXPECT_GT(visibleItemRect.y, assetListRect.y);
    EXPECT_LT(visibleItemRect.y, assetListRect.y + assetListRect.height);

    EXPECT_EQ(
        CountCommandsOfType(frame.drawData, UIDrawCommandType::PushClipRect),
        frame.stats.clipPushCommandCount);
    EXPECT_EQ(
        CountCommandsOfType(frame.drawData, UIDrawCommandType::PopClipRect),
        frame.stats.clipPopCommandCount);
    EXPECT_GE(frame.stats.clipPushCommandCount, 3u);
    EXPECT_GE(frame.stats.clipPopCommandCount, 3u);
}

TEST(NewEditorXCUILayoutLabRuntimeTest, HoverIgnoresClippedScrollViewContent) {
    XCEngine::Editor::XCUIBackend::XCUILayoutLabRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baseline = runtime.Update(BuildInputState());
    ASSERT_TRUE(baseline.stats.documentsReady);

    XCEngine::UI::UIRect assetListRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("assetList", assetListRect));

    XCEngine::Editor::XCUIBackend::XCUILayoutLabInputState input = BuildInputState();
    input.pointerPosition = XCEngine::UI::UIPoint(
        assetListRect.x + assetListRect.width * 0.5f,
        assetListRect.y + assetListRect.height + 6.0f);
    const auto& frame = runtime.Update(input);

    ASSERT_TRUE(frame.stats.documentsReady);
    EXPECT_TRUE(frame.stats.hoveredElementId.empty());
}