#include "HierarchyPanelSupport.h"

namespace XCEngine::UI::Editor::App {

using namespace HierarchyPanelSupport;

void HierarchyPanel::Append(UIDrawList& drawList) const {
    if (!m_visible ||
        m_treeFrame.layout.bounds.width <= 0.0f ||
        m_treeFrame.layout.bounds.height <= 0.0f) {
        return;
    }

    const Widgets::UIEditorTreeViewPalette palette = BuildEditorTreeViewPalette();
    const Widgets::UIEditorTreeViewMetrics metrics = BuildEditorTreeViewMetrics();
    AppendUIEditorTreeViewBackground(
        drawList,
        m_treeFrame.layout,
        m_treeItems,
        m_selection,
        m_treeInteractionState.treeViewState,
        palette,
        metrics);
    AppendUIEditorTreeViewForeground(
        drawList,
        m_treeFrame.layout,
        m_treeItems,
        palette,
        metrics);

    if (!m_dragState.dragging || !m_dragState.validDropTarget) {
        return;
    }

    if (m_dragState.dropToRoot) {
        drawList.AddRectOutline(
            m_treeFrame.layout.bounds,
            kDragPreviewColor,
            1.0f,
            0.0f);
        return;
    }

    const std::size_t visibleIndex = FindVisibleIndexForItemId(
        m_treeFrame.layout,
        m_treeItems,
        m_dragState.dropTargetItemId);
    if (visibleIndex == UIEditorTreeViewInvalidIndex ||
        visibleIndex >= m_treeFrame.layout.rowRects.size()) {
        return;
    }

    drawList.AddRectOutline(
        m_treeFrame.layout.rowRects[visibleIndex],
        kDragPreviewColor,
        1.0f,
        0.0f);
}

} // namespace XCEngine::UI::Editor::App