XCEngine/editor/src/UI/Widgets.h

#pragma once

#include "Core.h"
#include "StyleTokens.h"

#include <imgui.h>
#include <string>

namespace XCEngine {
namespace Editor {
namespace UI {

struct ComponentSectionResult {
    bool open = false;
};

struct HierarchyNodeResult {
    bool open = false;
    bool clicked = false;
    bool doubleClicked = false;
};

struct AssetTileResult {
    bool clicked = false;
    bool contextRequested = false;
    bool openRequested = false;
    bool hovered = false;
    ImVec2 min = ImVec2(0.0f, 0.0f);
    ImVec2 max = ImVec2(0.0f, 0.0f);
};

enum class AssetIconKind {
    Folder,
    File
};

enum class DialogActionResult {
    None,
    Primary,
    Secondary
};

enum class MenuCommandKind {
    Action,
    Separator
};

struct MenuCommand {
    MenuCommandKind kind = MenuCommandKind::Action;
    const char* label = nullptr;
    const char* shortcut = nullptr;
    bool selected = false;
    bool enabled = true;

    static MenuCommand Action(
        const char* label,
        const char* shortcut = nullptr,
        bool selected = false,
        bool enabled = true) {
        return MenuCommand{ MenuCommandKind::Action, label, shortcut, selected, enabled };
    }

    static MenuCommand Separator() {
        return MenuCommand{ MenuCommandKind::Separator, nullptr, nullptr, false, true };
    }
};

template <typename DrawContentFn>
inline bool DrawMenuScope(const char* label, DrawContentFn&& drawContent) {
    if (!ImGui::BeginMenu(label)) {
        return false;
    }

    drawContent();
    ImGui::EndMenu();
    return true;
}

template <typename ExecuteFn>
inline bool DrawMenuCommand(const MenuCommand& command, ExecuteFn&& execute) {
    if (command.kind == MenuCommandKind::Separator) {
        ImGui::Separator();
        return false;
    }

    if (!ImGui::MenuItem(command.label, command.shortcut, command.selected, command.enabled)) {
        return false;
    }

    execute();
    return true;
}

template <size_t N, typename ExecuteFn>
inline void DrawMenuCommands(const MenuCommand (&commands)[N], ExecuteFn&& execute) {
    for (size_t i = 0; i < N; ++i) {
        DrawMenuCommand(commands[i], [&]() { execute(i); });
    }
}

inline bool ToolbarSearchField(
    const char* id,
    const char* hint,
    char* buffer,
    size_t bufferSize,
    float trailingWidth = 0.0f) {
    ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, SearchFieldFramePadding());
    ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, SearchFieldFrameRounding());
    const float width = ImGui::GetContentRegionAvail().x - trailingWidth;
    ImGui::SetNextItemWidth(width > 0.0f ? width : 0.0f);
    const bool changed = ImGui::InputTextWithHint(id, hint, buffer, bufferSize);
    ImGui::PopStyleVar(2);
    return changed;
}

inline void DrawToolbarLabel(const char* text) {
    ImGui::AlignTextToFramePadding();
    ImGui::TextColored(HintTextColor(), "%s", text);
}

inline bool ToolbarToggleButton(const char* label, bool& active, ImVec2 size = ImVec2(0.0f, 0.0f)) {
    if (!ToolbarButton(label, active, size)) {
        return false;
    }

    active = !active;
    return true;
}

inline void DrawToolbarRowGap() {
    ImGui::Dummy(ImVec2(0.0f, ToolbarRowGap()));
}

inline void DrawHintText(const char* text) {
    ImGui::TextColored(HintTextColor(), "%s", text);
}

inline void DrawEmptyState(
    const char* title,
    const char* subtitle = nullptr,
    ImVec2 start = ImVec2(10.0f, 10.0f)) {
    ImGui::SetCursorPos(start);
    ImGui::TextUnformatted(title);

    if (subtitle && subtitle[0] != '\0') {
        ImGui::SetCursorPos(ImVec2(start.x, start.y + EmptyStateLineOffset()));
        ImGui::TextColored(EmptyStateSubtitleColor(), "%s", subtitle);
    }
}

template <typename GetNameFn, typename NavigateFn>
inline void DrawToolbarBreadcrumbs(
    const char* rootLabel,
    size_t segmentCount,
    GetNameFn&& getName,
    NavigateFn&& navigateToSegment) {
    ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0.0f, 0.0f, 0.0f, 0.0f));
    ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImVec4(0.0f, 0.0f, 0.0f, 0.0f));

    if (segmentCount == 0) {
        ImGui::TextUnformatted(rootLabel);
        ImGui::PopStyleColor(2);
        return;
    }

    for (size_t i = 0; i < segmentCount; ++i) {
        if (i > 0) {
            ImGui::SameLine();
            ImGui::TextDisabled("/");
            ImGui::SameLine();
        }

        const std::string label = getName(i);
        if (i + 1 < segmentCount) {
            if (ImGui::Button(label.c_str())) {
                navigateToSegment(i);
            }
        } else {
            ImGui::Text("%s", label.c_str());
        }
    }

    ImGui::PopStyleColor(2);
}

inline HierarchyNodeResult DrawHierarchyNode(
    const void* id,
    const char* label,
    bool selected,
    bool leaf) {
    ImGuiTreeNodeFlags flags =
        ImGuiTreeNodeFlags_OpenOnArrow |
        ImGuiTreeNodeFlags_SpanAvailWidth |
        ImGuiTreeNodeFlags_FramePadding;
    if (leaf) {
        flags |= ImGuiTreeNodeFlags_Leaf;
    }
    if (selected) {
        flags |= ImGuiTreeNodeFlags_Selected;
    }

    ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, HierarchyNodeFramePadding());
    const bool open = ImGui::TreeNodeEx(id, flags, "%s", label);
    ImGui::PopStyleVar();

    return HierarchyNodeResult{
        open,
        ImGui::IsItemClicked() && !ImGui::IsItemToggledOpen(),
        ImGui::IsItemHovered() && ImGui::IsMouseDoubleClicked(0)
    };
}

inline void EndHierarchyNode() {
    ImGui::TreePop();
}

template <typename DrawIconFn>
inline AssetTileResult DrawAssetTile(
    const char* label,
    bool selected,
    bool dimmed,
    DrawIconFn&& drawIcon) {
    const ImVec2 tileSize = AssetTileSize();
    ImGui::InvisibleButton("##AssetBtn", tileSize);

    const bool clicked = ImGui::IsItemClicked(ImGuiMouseButton_Left);
    const bool contextRequested = ImGui::IsItemClicked(ImGuiMouseButton_Right);
    const bool openRequested = ImGui::IsItemHovered() && ImGui::IsMouseDoubleClicked(0);
    const bool hovered = ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByActiveItem);

    const ImVec2 min = ImGui::GetItemRectMin();
    const ImVec2 max = ImVec2(min.x + tileSize.x, min.y + tileSize.y);
    ImDrawList* drawList = ImGui::GetWindowDrawList();

    if (hovered || selected) {
        drawList->AddRectFilled(min, max, ImGui::GetColorU32(selected ? AssetTileSelectedFillColor() : AssetTileHoverFillColor()), AssetTileRounding());
    }
    if (selected) {
        drawList->AddRect(min, max, ImGui::GetColorU32(AssetTileSelectedBorderColor()), AssetTileRounding());
    }
    if (dimmed) {
        drawList->AddRectFilled(min, max, ImGui::GetColorU32(AssetTileDraggedOverlayColor()), 0.0f);
    }

    const ImVec2 iconOffset = AssetTileIconOffset();
    const ImVec2 iconSize = AssetTileIconSize();
    const ImVec2 iconMin(min.x + iconOffset.x, min.y + iconOffset.y);
    const ImVec2 iconMax(iconMin.x + iconSize.x, iconMin.y + iconSize.y);
    drawIcon(drawList, iconMin, iconMax);

    const ImVec2 textSize = ImGui::CalcTextSize(label);
    const float textY = max.y - textSize.y - AssetTileTextPadding().y;
    ImGui::PushClipRect(ImVec2(min.x + AssetTileTextPadding().x, min.y), ImVec2(max.x - AssetTileTextPadding().x, max.y), true);
    drawList->AddText(ImVec2(min.x + AssetTileTextPadding().x, textY), ImGui::GetColorU32(AssetTileTextColor(selected)), label);
    ImGui::PopClipRect();

    return AssetTileResult{ clicked, contextRequested, openRequested, hovered, min, max };
}

inline void DrawAssetIcon(ImDrawList* drawList, const ImVec2& min, const ImVec2& max, AssetIconKind kind) {
    if (kind == AssetIconKind::Folder) {
        const ImU32 fillColor = ImGui::GetColorU32(AssetFolderIconFillColor());
        const ImU32 lineColor = ImGui::GetColorU32(AssetFolderIconLineColor());
        const float width = max.x - min.x;
        const float height = max.y - min.y;
        const ImVec2 tabMax(min.x + width * 0.45f, min.y + height * 0.35f);
        drawList->AddRectFilled(ImVec2(min.x, min.y + height * 0.14f), tabMax, fillColor, 2.0f);
        drawList->AddRectFilled(ImVec2(min.x, min.y + height * 0.28f), max, fillColor, 2.0f);
        drawList->AddRect(ImVec2(min.x, min.y + height * 0.14f), tabMax, lineColor, 2.0f);
        drawList->AddRect(ImVec2(min.x, min.y + height * 0.28f), max, lineColor, 2.0f);
        return;
    }

    const ImU32 fillColor = ImGui::GetColorU32(AssetFileIconFillColor());
    const ImU32 lineColor = ImGui::GetColorU32(AssetFileIconLineColor());
    const ImVec2 foldA(max.x - 8.0f, min.y);
    const ImVec2 foldB(max.x, min.y + 8.0f);
    drawList->AddRectFilled(min, max, fillColor, 2.0f);
    drawList->AddRect(min, max, lineColor, 2.0f);
    drawList->AddTriangleFilled(foldA, ImVec2(max.x, min.y), foldB, ImGui::GetColorU32(AssetFileFoldColor()));
    drawList->AddLine(foldA, foldB, lineColor);
}

template <typename DrawMenuFn>
inline ComponentSectionResult BeginComponentSection(
    const void* id,
    const char* label,
    DrawMenuFn&& drawMenu,
    bool defaultOpen = true) {
    const ImGuiStyle& style = ImGui::GetStyle();
    ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, InspectorSectionFramePadding());
    ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(style.ItemSpacing.x, InspectorSectionItemSpacing().y));

    ImGuiTreeNodeFlags flags =
        ImGuiTreeNodeFlags_Framed |
        ImGuiTreeNodeFlags_SpanAvailWidth |
        ImGuiTreeNodeFlags_FramePadding |
        ImGuiTreeNodeFlags_AllowOverlap;
    if (defaultOpen) {
        flags |= ImGuiTreeNodeFlags_DefaultOpen;
    }

    const bool open = ImGui::TreeNodeEx(id, flags, "%s", label);
    ImGui::PopStyleVar(2);

    if (BeginPopupContextItem("##ComponentSettings")) {
        drawMenu();
        EndPopup();
    }

    return ComponentSectionResult{ open };
}

inline ComponentSectionResult BeginComponentSection(
    const void* id,
    const char* label,
    bool defaultOpen = true) {
    return BeginComponentSection(id, label, []() {}, defaultOpen);
}

inline void EndComponentSection() {
    ImGui::TreePop();
}

inline bool InspectorActionButton(const char* label, ImVec2 size = ImVec2(-1.0f, 0.0f)) {
    ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, InspectorActionButtonPadding());
    const bool pressed = ImGui::Button(label, size);
    ImGui::PopStyleVar();
    return pressed;
}

inline bool BeginTitledPopup(const char* id, const char* title) {
    const bool open = BeginPopup(id);
    if (!open) {
        return false;
    }

    if (title && title[0] != '\0') {
        ImGui::TextUnformatted(title);
        ImGui::Separator();
    }

    return true;
}

inline void EndTitledPopup() {
    EndPopup();
}

inline DialogActionResult DrawDialogActionRow(
    const char* primaryLabel,
    const char* secondaryLabel,
    bool primaryEnabled = true,
    bool secondaryEnabled = true) {
    DialogActionResult result = DialogActionResult::None;

    ImGui::BeginDisabled(!primaryEnabled);
    if (ImGui::Button(primaryLabel, DialogActionButtonSize())) {
        result = DialogActionResult::Primary;
    }
    ImGui::EndDisabled();

    ImGui::SameLine();

    ImGui::BeginDisabled(!secondaryEnabled);
    if (ImGui::Button(secondaryLabel, DialogActionButtonSize())) {
        result = DialogActionResult::Secondary;
    }
    ImGui::EndDisabled();

    return result;
}

inline void DrawRightAlignedText(const char* text, const ImVec4& color, float rightPadding = MenuBarStatusRightPadding()) {
    const ImVec2 textSize = ImGui::CalcTextSize(text);
    const float targetX = ImGui::GetWindowWidth() - textSize.x - rightPadding;
    if (targetX > ImGui::GetCursorPosX()) {
        ImGui::SetCursorPosX(targetX);
    }
    ImGui::TextColored(color, "%s", text);
}

inline void BeginTitledTooltip(const char* title) {
    ImGui::BeginTooltip();
    if (title && title[0] != '\0') {
        ImGui::TextUnformatted(title);
        ImGui::Separator();
    }
}

inline void EndTitledTooltip() {
    ImGui::EndTooltip();
}

inline bool DrawConsoleLogRow(const char* text) {
    ImGui::TextUnformatted(text);

    if (ImGui::IsItemHovered()) {
        ImDrawList* drawList = ImGui::GetWindowDrawList();
        drawList->AddRectFilled(ImGui::GetItemRectMin(), ImGui::GetItemRectMax(), ImGui::GetColorU32(ConsoleRowHoverFillColor()));
    }

    return ImGui::IsItemClicked();
}

}
}
}