XCEngine/new_editor/include/XCEditor/Shell/UIEditorDockHost.h

#pragma once

#include <XCEditor/Shell/UIEditorPanelRegistry.h>
#include <XCEditor/Shell/UIEditorWorkspaceModel.h>
#include <XCEditor/Shell/UIEditorWorkspaceSession.h>
#include <XCEditor/Shell/UIEditorPanelFrame.h>
#include <XCEditor/Collections/UIEditorTabStrip.h>

#include <XCEngine/UI/Layout/UISplitterLayout.h>

#include <cstddef>
#include <cstdint>
#include <string>
#include <string_view>
#include <vector>

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

enum class UIEditorDockHostHitTargetKind : std::uint8_t {
    None = 0,
    SplitterHandle,
    TabStripBackground,
    Tab,
    TabCloseButton,
    PanelHeader,
    PanelBody,
    PanelFooter,
    PanelCloseButton
};

struct UIEditorDockHostHitTarget {
    UIEditorDockHostHitTargetKind kind = UIEditorDockHostHitTargetKind::None;
    std::string nodeId = {};
    std::string panelId = {};
    std::size_t index = UIEditorTabStripInvalidIndex;
};

struct UIEditorDockHostTabStripVisualState {
    std::string nodeId = {};
    UIEditorTabStripState state = {};
};

struct UIEditorDockHostDropPreviewState {
    bool visible = false;
    std::string sourceNodeId = {};
    std::string sourcePanelId = {};
    std::string targetNodeId = {};
    UIEditorWorkspaceDockPlacement placement =
        UIEditorWorkspaceDockPlacement::Center;
    std::size_t insertionIndex = UIEditorTabStripInvalidIndex;
};

struct UIEditorDockHostState {
    bool focused = false;
    UIEditorDockHostHitTarget hoveredTarget = {};
    std::string activeSplitterNodeId = {};
    std::vector<UIEditorDockHostTabStripVisualState> tabStripStates = {};
    UIEditorDockHostDropPreviewState dropPreview = {};
};

struct UIEditorDockHostMetrics {
    ::XCEngine::UI::Layout::UISplitterMetrics splitterMetrics =
        ::XCEngine::UI::Layout::UISplitterMetrics{ 2.0f, 10.0f };
    UIEditorTabStripMetrics tabStripMetrics = {};
    UIEditorPanelFrameMetrics panelFrameMetrics = {};
    ::XCEngine::UI::UISize minimumStandalonePanelBodySize =
        ::XCEngine::UI::UISize(180.0f, 140.0f);
    ::XCEngine::UI::UISize minimumTabContentBodySize =
        ::XCEngine::UI::UISize(260.0f, 180.0f);
    float splitterHandleRounding = 0.0f;
    float placeholderLineGap = 22.0f;
};

struct UIEditorDockHostPalette {
    UIEditorTabStripPalette tabStripPalette = {};
    UIEditorPanelFramePalette panelFramePalette = {};
    ::XCEngine::UI::UIColor splitterColor =
        ::XCEngine::UI::UIColor(0.13f, 0.13f, 0.13f, 1.0f);
    ::XCEngine::UI::UIColor splitterHoveredColor =
        ::XCEngine::UI::UIColor(0.13f, 0.13f, 0.13f, 1.0f);
    ::XCEngine::UI::UIColor splitterActiveColor =
        ::XCEngine::UI::UIColor(0.13f, 0.13f, 0.13f, 1.0f);
    ::XCEngine::UI::UIColor placeholderTitleColor =
        ::XCEngine::UI::UIColor(0.93f, 0.94f, 0.96f, 1.0f);
    ::XCEngine::UI::UIColor placeholderTextColor =
        ::XCEngine::UI::UIColor(0.70f, 0.72f, 0.74f, 1.0f);
    ::XCEngine::UI::UIColor placeholderMutedColor =
        ::XCEngine::UI::UIColor(0.58f, 0.59f, 0.62f, 1.0f);
    ::XCEngine::UI::UIColor dropPreviewFillColor =
        ::XCEngine::UI::UIColor(0.88f, 0.88f, 0.88f, 0.14f);
    ::XCEngine::UI::UIColor dropPreviewBorderColor =
        ::XCEngine::UI::UIColor(0.94f, 0.94f, 0.94f, 0.78f);
};

struct UIEditorDockHostTabItemLayout {
    std::string panelId = {};
    std::string title = {};
    bool closable = true;
    bool active = false;
};

struct UIEditorDockHostSplitterLayout {
    std::string nodeId = {};
    UIEditorWorkspaceSplitAxis axis = UIEditorWorkspaceSplitAxis::Horizontal;
    ::XCEngine::UI::UIRect bounds = {};
    ::XCEngine::UI::UIRect handleHitRect = {};
    ::XCEngine::UI::Layout::UISplitterConstraints constraints = {};
    ::XCEngine::UI::Layout::UISplitterMetrics metrics = {};
    ::XCEngine::UI::Layout::UISplitterLayoutResult splitterLayout = {};
    bool hovered = false;
    bool active = false;
};

struct UIEditorDockHostTabStackLayout {
    std::string nodeId = {};
    std::string selectedPanelId = {};
    ::XCEngine::UI::UIRect bounds = {};
    std::vector<UIEditorDockHostTabItemLayout> items = {};
    UIEditorTabStripState tabStripState = {};
    UIEditorTabStripLayout tabStripLayout = {};
    UIEditorPanelFrameState contentFrameState = {};
    UIEditorPanelFrameLayout contentFrameLayout = {};
};

struct UIEditorDockHostDropPreviewLayout {
    bool visible = false;
    std::string targetNodeId = {};
    UIEditorWorkspaceDockPlacement placement =
        UIEditorWorkspaceDockPlacement::Center;
    std::size_t insertionIndex = UIEditorTabStripInvalidIndex;
    ::XCEngine::UI::UIRect previewRect = {};
};

struct UIEditorDockHostLayout {
    ::XCEngine::UI::UIRect bounds = {};
    std::vector<UIEditorDockHostSplitterLayout> splitters = {};
    std::vector<UIEditorDockHostTabStackLayout> tabStacks = {};
    UIEditorDockHostDropPreviewLayout dropPreview = {};
};

enum class UIEditorDockHostCursorKind : std::uint8_t {
    Arrow = 0,
    ResizeEW,
    ResizeNS
};

// Allows higher-level compose to own panel body presentation while DockHost
// keeps drawing the surrounding chrome/frame.
struct UIEditorDockHostForegroundOptions {
    std::vector<std::string> externalBodyPanelIds = {};
};

const UIEditorDockHostSplitterLayout* FindUIEditorDockHostSplitterLayout(
    const UIEditorDockHostLayout& layout,
    std::string_view nodeId);

UIEditorDockHostCursorKind ResolveUIEditorDockHostCursorKind(
    const UIEditorDockHostLayout& layout);

UIEditorDockHostLayout BuildUIEditorDockHostLayout(
    const ::XCEngine::UI::UIRect& bounds,
    const UIEditorPanelRegistry& panelRegistry,
    const UIEditorWorkspaceModel& workspace,
    const UIEditorWorkspaceSession& session,
    const UIEditorDockHostState& state = {},
    const UIEditorDockHostMetrics& metrics = {});

UIEditorDockHostHitTarget HitTestUIEditorDockHost(
    const UIEditorDockHostLayout& layout,
    const ::XCEngine::UI::UIPoint& point);

void AppendUIEditorDockHostBackground(
    ::XCEngine::UI::UIDrawList& drawList,
    const UIEditorDockHostLayout& layout,
    const UIEditorDockHostPalette& palette = {},
    const UIEditorDockHostMetrics& metrics = {});

void AppendUIEditorDockHostForeground(
    ::XCEngine::UI::UIDrawList& drawList,
    const UIEditorDockHostLayout& layout,
    const UIEditorDockHostForegroundOptions& options = {},
    const UIEditorDockHostPalette& palette = {},
    const UIEditorDockHostMetrics& metrics = {});

void AppendUIEditorDockHostForeground(
    ::XCEngine::UI::UIDrawList& drawList,
    const UIEditorDockHostLayout& layout,
    const UIEditorDockHostPalette& palette,
    const UIEditorDockHostMetrics& metrics = {});

void AppendUIEditorDockHost(
    ::XCEngine::UI::UIDrawList& drawList,
    const ::XCEngine::UI::UIRect& bounds,
    const UIEditorPanelRegistry& panelRegistry,
    const UIEditorWorkspaceModel& workspace,
    const UIEditorWorkspaceSession& session,
    const UIEditorDockHostState& state = {},
    const UIEditorDockHostForegroundOptions& foregroundOptions = {},
    const UIEditorDockHostPalette& palette = {},
    const UIEditorDockHostMetrics& metrics = {});

void AppendUIEditorDockHost(
    ::XCEngine::UI::UIDrawList& drawList,
    const ::XCEngine::UI::UIRect& bounds,
    const UIEditorPanelRegistry& panelRegistry,
    const UIEditorWorkspaceModel& workspace,
    const UIEditorWorkspaceSession& session,
    const UIEditorDockHostState& state,
    const UIEditorDockHostPalette& palette,
    const UIEditorDockHostMetrics& metrics = {});

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