#include <XCEditor/Widgets/UIEditorFieldRowLayout.h>

#include <algorithm>
#include <cmath>

namespace XCEngine::UI::Editor::Widgets {

namespace {

float ClampNonNegative(float value) {
    return (std::max)(0.0f, value);
}

bool AreEqual(float lhs, float rhs) {
    return std::abs(lhs - rhs) <= 0.001f;
}

} // namespace

const UIEditorInspectorFieldStyleTokens& GetUIEditorInspectorFieldStyleTokens() {
    static const UIEditorInspectorFieldStyleTokens kTokens = {};
    return kTokens;
}

bool AreUIEditorFieldMetricsEqual(float lhs, float rhs) {
    return AreEqual(lhs, rhs);
}

bool AreUIEditorFieldColorsEqual(
    const ::XCEngine::UI::UIColor& lhs,
    const ::XCEngine::UI::UIColor& rhs) {
    return AreEqual(lhs.r, rhs.r) &&
        AreEqual(lhs.g, rhs.g) &&
        AreEqual(lhs.b, rhs.b) &&
        AreEqual(lhs.a, rhs.a);
}

UIEditorFieldRowLayout BuildUIEditorFieldRowLayout(
    const ::XCEngine::UI::UIRect& bounds,
    float minimumControlWidth,
    const UIEditorFieldRowLayoutMetrics& metrics) {
    const float rowHeight = bounds.height > 0.0f ? bounds.height : metrics.rowHeight;
    const ::XCEngine::UI::UIRect rowBounds(bounds.x, bounds.y, bounds.width, rowHeight);

    const float resolvedMinimumControlWidth =
        ClampNonNegative((std::min)(minimumControlWidth, rowBounds.width));
    const float preferredControlX = rowBounds.x + metrics.controlColumnStart;
    const float maximumControlX =
        rowBounds.x + rowBounds.width - metrics.controlTrailingInset - resolvedMinimumControlWidth;
    const float controlX =
        (std::clamp)(
            (std::min)(preferredControlX, maximumControlX),
            rowBounds.x,
            rowBounds.x + rowBounds.width - metrics.controlTrailingInset);
    const float controlInsetY = (std::min)(metrics.controlInsetY, rowBounds.height * 0.25f);
    const float controlWidth =
        ClampNonNegative(rowBounds.x + rowBounds.width - metrics.controlTrailingInset - controlX);

    UIEditorFieldRowLayout layout = {};
    layout.bounds = rowBounds;
    layout.labelRect = ::XCEngine::UI::UIRect(
        rowBounds.x + metrics.horizontalPadding,
        rowBounds.y,
        ClampNonNegative(controlX - metrics.labelControlGap - rowBounds.x - metrics.horizontalPadding),
        rowBounds.height);
    layout.controlRect = ::XCEngine::UI::UIRect(
        controlX,
        rowBounds.y + controlInsetY,
        controlWidth,
        ClampNonNegative(rowBounds.height - controlInsetY * 2.0f));
    return layout;
}

} // namespace XCEngine::UI::Editor::Widgets