LightlessClient/LightlessSync/UI/Style/MainStyle.cs

// inspiration: brio because it's style is fucking amazing

using Dalamud.Bindings.ImGui;
using LightlessSync.LightlessConfiguration;
using LightlessSync.LightlessConfiguration.Configurations;
using System;
using System.Collections.Generic;
using System.Numerics;

namespace LightlessSync.UI.Style;

internal static class MainStyle
{
    public readonly record struct StyleColorOption(string Key, string Label, Func<Vector4> DefaultValue, ImGuiCol Target, string? Description = null, string? UiColorKey = null);
    public readonly record struct StyleFloatOption(string Key, string Label, float DefaultValue, ImGuiStyleVar Target, float? Min = null, float? Max = null, float Speed = 0.25f, string? Description = null);
    public readonly record struct StyleVector2Option(string Key, string Label, Func<Vector2> DefaultValue, ImGuiStyleVar Target, Vector2? Min = null, Vector2? Max = null, float Speed = 0.25f, string? Description = null);

    private static LightlessConfigService? _config;
    private static UiThemeConfigService? _themeConfig;
    public static void Init(LightlessConfigService config, UiThemeConfigService themeConfig)
    {
        _config = config;
        _themeConfig = themeConfig;
    }
    public static bool ShouldUseTheme => _config?.Current.UseLightlessRedesign ?? false;

    private static bool _hasPushed;
    private static int _pushedColorCount;
    private static int _pushedStyleVarCount;

    private static readonly StyleColorOption[] _colorOptions =
    [
        new("color.text", "Text", () => Rgba(255, 255, 255, 255), ImGuiCol.Text),
        new("color.textDisabled", "Text (Disabled)", () => Rgba(128, 128, 128, 255), ImGuiCol.TextDisabled),
        new("color.windowBg", "Window Background", () => Rgba(23, 23, 23, 248), ImGuiCol.WindowBg),
        new("color.childBg", "Child Background", () => Rgba(23, 23, 23, 66), ImGuiCol.ChildBg),
        new("color.popupBg", "Popup Background", () => Rgba(23, 23, 23, 248), ImGuiCol.PopupBg),
        new("color.border", "Border", () => Rgba(65, 65, 65, 255), ImGuiCol.Border),
        new("color.borderShadow", "Border Shadow", () => Rgba(0, 0, 0, 150), ImGuiCol.BorderShadow),
        new("color.frameBg", "Frame Background", () => Rgba(40, 40, 40, 255), ImGuiCol.FrameBg),
        new("color.frameBgHovered", "Frame Background (Hover)", () => Rgba(50, 50, 50, 100), ImGuiCol.FrameBgHovered),
        new("color.frameBgActive", "Frame Background (Active)", () => Rgba(30, 30, 30, 255), ImGuiCol.FrameBgActive),
        new("color.titleBg", "Title Background", () => Rgba(24, 24, 24, 232), ImGuiCol.TitleBg),
        new("color.titleBgActive", "Title Background (Active)", () => Rgba(30, 30, 30, 255), ImGuiCol.TitleBgActive),
        new("color.titleBgCollapsed", "Title Background (Collapsed)", () => Rgba(27, 27, 27, 255), ImGuiCol.TitleBgCollapsed),

        new("color.menuBarBg", "Menu Bar Background", () => Rgba(36, 36, 36, 255), ImGuiCol.MenuBarBg),
        new("color.scrollbarBg", "Scrollbar Background", () => Rgba(0, 0, 0, 0), ImGuiCol.ScrollbarBg),
        new("color.scrollbarGrab", "Scrollbar Grab", () => Rgba(62, 62, 62, 255), ImGuiCol.ScrollbarGrab),
        new("color.scrollbarGrabHovered", "Scrollbar Grab (Hover)", () => Rgba(70, 70, 70, 255), ImGuiCol.ScrollbarGrabHovered),
        new("color.scrollbarGrabActive", "Scrollbar Grab (Active)", () => Rgba(70, 70, 70, 255), ImGuiCol.ScrollbarGrabActive),
        new("color.checkMark", "Check Mark", () => UIColors.Get("LightlessPurple"), ImGuiCol.CheckMark, UiColorKey: "LightlessPurple"),
        new("color.sliderGrab", "Slider Grab", () => Rgba(101, 101, 101, 255), ImGuiCol.SliderGrab),
        new("color.sliderGrabActive", "Slider Grab (Active)", () => Rgba(123, 123, 123, 255), ImGuiCol.SliderGrabActive),
        new("color.button", "Button", () => UIColors.Get("ButtonDefault"), ImGuiCol.Button, UiColorKey: "ButtonDefault"),
        new("color.buttonHovered", "Button (Hover)", () => UIColors.Get("LightlessPurple"), ImGuiCol.ButtonHovered, UiColorKey: "LightlessPurple"),
        new("color.buttonActive", "Button (Active)", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.ButtonActive, UiColorKey: "LightlessPurpleActive"),
        new("color.header", "Header", () => Rgba(0, 0, 0, 60), ImGuiCol.Header),
        new("color.headerHovered", "Header (Hover)", () => Rgba(0, 0, 0, 90), ImGuiCol.HeaderHovered),
        new("color.headerActive", "Header (Active)", () => Rgba(0, 0, 0, 120), ImGuiCol.HeaderActive),
        new("color.separator", "Separator", () => Rgba(75, 75, 75, 121), ImGuiCol.Separator),
        new("color.separatorHovered", "Separator (Hover)", () => UIColors.Get("LightlessPurple"), ImGuiCol.SeparatorHovered, UiColorKey: "LightlessPurple"),
        new("color.separatorActive", "Separator (Active)", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.SeparatorActive, UiColorKey: "LightlessPurpleActive"),
        new("color.resizeGrip", "Resize Grip", () => Rgba(0, 0, 0, 0), ImGuiCol.ResizeGrip),
        new("color.resizeGripHovered", "Resize Grip (Hover)", () => Rgba(0, 0, 0, 0), ImGuiCol.ResizeGripHovered),
        new("color.resizeGripActive", "Resize Grip (Active)", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.ResizeGripActive, UiColorKey: "LightlessPurpleActive"),
        new("color.tab", "Tab", () => Rgba(40, 40, 40, 255), ImGuiCol.Tab),
        new("color.tabHovered", "Tab (Hover)", () => UIColors.Get("LightlessPurple"), ImGuiCol.TabHovered, UiColorKey: "LightlessPurple"),
        new("color.tabActive", "Tab (Active)", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.TabActive, UiColorKey: "LightlessPurpleActive"),
        new("color.tabUnfocused", "Tab (Unfocused)", () => Rgba(40, 40, 40, 255), ImGuiCol.TabUnfocused),
        new("color.tabUnfocusedActive", "Tab (Unfocused Active)", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.TabUnfocusedActive, UiColorKey: "LightlessPurpleActive"),
        new("color.dockingPreview", "Docking Preview", () => UIColors.Get("LightlessPurpleActive"), ImGuiCol.DockingPreview, UiColorKey: "LightlessPurpleActive"),
        new("color.dockingEmptyBg", "Docking Empty Background", () => Rgba(50, 50, 50, 255), ImGuiCol.DockingEmptyBg),
        new("color.plotLines", "Plot Lines", () => Rgba(150, 150, 150, 255), ImGuiCol.PlotLines),
        new("color.tableHeaderBg", "Table Header Background", () => Rgba(48, 48, 48, 255), ImGuiCol.TableHeaderBg),
        new("color.tableBorderStrong", "Table Border Strong", () => Rgba(79, 79, 89, 255), ImGuiCol.TableBorderStrong),
        new("color.tableBorderLight", "Table Border Light", () => Rgba(59, 59, 64, 255), ImGuiCol.TableBorderLight),
        new("color.tableRowBg", "Table Row Background", () => Rgba(0, 0, 0, 0), ImGuiCol.TableRowBg),
        new("color.tableRowBgAlt", "Table Row Background (Alt)", () => Rgba(255, 255, 255, 15), ImGuiCol.TableRowBgAlt),
        new("color.textSelectedBg", "Text Selection Background", () => Rgba(173, 138, 245, 255), ImGuiCol.TextSelectedBg),
        new("color.dragDropTarget", "Drag & Drop Target", () => Rgba(173, 138, 245, 255), ImGuiCol.DragDropTarget),
        new("color.navHighlight", "Navigation Highlight", () => Rgba(173, 138, 245, 179), ImGuiCol.NavHighlight),
        new("color.navWindowingDimBg", "Navigation Window Dim", () => Rgba(204, 204, 204, 51), ImGuiCol.NavWindowingDimBg),
        new("color.navWindowingHighlight", "Navigation Window Highlight", () => Rgba(204, 204, 204, 89), ImGuiCol.NavWindowingHighlight)
    ];

    private static readonly StyleVector2Option[] _vector2Options =
    [
        new("vector.windowPadding", "Window Padding", () => new Vector2(6f, 6f), ImGuiStyleVar.WindowPadding),
        new("vector.framePadding", "Frame Padding", () => new Vector2(4f, 3f), ImGuiStyleVar.FramePadding),
        new("vector.cellPadding", "Cell Padding", () => new Vector2(4f, 4f), ImGuiStyleVar.CellPadding),
        new("vector.itemSpacing", "Item Spacing", () => new Vector2(4f, 4f), ImGuiStyleVar.ItemSpacing),
        new("vector.itemInnerSpacing", "Item Inner Spacing", () => new Vector2(4f, 4f), ImGuiStyleVar.ItemInnerSpacing)
    ];

    private static readonly StyleFloatOption[] _floatOptions =
    [
        new("float.indentSpacing", "Indent Spacing", 21f, ImGuiStyleVar.IndentSpacing, 0f, 100f, 0.5f),
        new("float.scrollbarSize", "Scrollbar Size", 10f, ImGuiStyleVar.ScrollbarSize, 4f, 30f, 0.5f),
        new("float.grabMinSize", "Grab Minimum Size", 20f, ImGuiStyleVar.GrabMinSize, 1f, 80f, 0.5f),
        new("float.windowBorderSize", "Window Border Size", 1.5f, ImGuiStyleVar.WindowBorderSize, 0f, 5f, 0.1f),
        new("float.childBorderSize", "Child Border Size", 1.5f, ImGuiStyleVar.ChildBorderSize, 0f, 5f, 0.1f),
        new("float.popupBorderSize", "Popup Border Size", 1.5f, ImGuiStyleVar.PopupBorderSize, 0f, 5f, 0.1f),
        new("float.frameBorderSize", "Frame Border Size", 0f, ImGuiStyleVar.FrameBorderSize, 0f, 5f, 0.1f),
        new("float.windowRounding", "Window Rounding", 7f, ImGuiStyleVar.WindowRounding, 0f, 20f, 0.2f),
        new("float.childRounding", "Child Rounding", 4f, ImGuiStyleVar.ChildRounding, 0f, 20f, 0.2f),
        new("float.frameRounding", "Frame Rounding", 4f, ImGuiStyleVar.FrameRounding, 0f, 20f, 0.2f),
        new("float.popupRounding", "Popup Rounding", 4f, ImGuiStyleVar.PopupRounding, 0f, 20f, 0.2f),
        new("float.scrollbarRounding", "Scrollbar Rounding", 4f, ImGuiStyleVar.ScrollbarRounding, 0f, 20f, 0.2f),
        new("float.grabRounding", "Grab Rounding", 4f, ImGuiStyleVar.GrabRounding, 0f, 20f, 0.2f),
        new("float.tabRounding", "Tab Rounding", 4f, ImGuiStyleVar.TabRounding, 0f, 20f, 0.2f)
    ];

    public static IReadOnlyList<StyleColorOption> ColorOptions => _colorOptions;
    public static IReadOnlyList<StyleFloatOption> FloatOptions => _floatOptions;
    public static IReadOnlyList<StyleVector2Option> Vector2Options => _vector2Options;

    public static void PushStyle()
    {
        if (_hasPushed)
            PopStyle();

        if (!ShouldUseTheme)
        {
            _hasPushed = false;
            return;
        }

        _hasPushed = true;
        _pushedColorCount = 0;
        _pushedStyleVarCount = 0;

        foreach (var option in _colorOptions)
            Push(option.Target, ResolveColor(option));

        foreach (var option in _vector2Options)
            PushStyleVar(option.Target, ResolveVector(option));

        foreach (var option in _floatOptions)
            PushStyleVar(option.Target, ResolveFloat(option));
    }

    public static void PopStyle()
    {
        if (!_hasPushed)
            return;

        if (_pushedStyleVarCount > 0)
            ImGui.PopStyleVar(_pushedStyleVarCount);
        if (_pushedColorCount > 0)
            ImGui.PopStyleColor(_pushedColorCount);

        _hasPushed = false;
        _pushedColorCount = 0;
        _pushedStyleVarCount = 0;
    }

    private static Vector4 ResolveColor(StyleColorOption option)
    {
        var defaultValue = NormalizeColorVector(option.DefaultValue());
        if (_themeConfig?.Current.StyleOverrides.TryGetValue(option.Key, out var overrideValue) == true && overrideValue.Color is { } packed)
            return PackedColorToVector4(packed);

        return defaultValue;
    }

    private static Vector2 ResolveVector(StyleVector2Option option)
    {
        var value = option.DefaultValue();
        if (_themeConfig?.Current.StyleOverrides.TryGetValue(option.Key, out var overrideValue) == true && overrideValue.Vector2 is { } vectorOverride)
        {
            value = vectorOverride;
        }

        if (option.Min is { } min)
            value = Vector2.Max(value, min);
        if (option.Max is { } max)
            value = Vector2.Min(value, max);
        return value;
    }

    private static float ResolveFloat(StyleFloatOption option)
    {
        var value = option.DefaultValue;
        if (_themeConfig?.Current.StyleOverrides.TryGetValue(option.Key, out var overrideValue) == true && overrideValue.Float is { } floatOverride)
        {
            value = floatOverride;
        }

        if (option.Min.HasValue)
            value = MathF.Max(option.Min.Value, value);
        if (option.Max.HasValue)
            value = MathF.Min(option.Max.Value, value);
        return value;
    }

    private static void Push(ImGuiCol col, Vector4 rgba)
    {
        rgba = NormalizeColorVector(rgba);
        ImGui.PushStyleColor(col, rgba);
        _pushedColorCount++;
    }

    private static void PushStyleVar(ImGuiStyleVar var, float value)
    {
        ImGui.PushStyleVar(var, value);
        _pushedStyleVarCount++;
    }

    private static void PushStyleVar(ImGuiStyleVar var, Vector2 value)
    {
        ImGui.PushStyleVar(var, value);
        _pushedStyleVarCount++;
    }

    private static Vector4 Rgba(byte r, byte g, byte b, byte a = 255)
        => new Vector4(r / 255f, g / 255f, b / 255f, a / 255f);

    internal static Vector4 NormalizeColorVector(Vector4 rgba)
    {
        if (rgba.X > 1f || rgba.Y > 1f || rgba.Z > 1f || rgba.W > 1f)
            rgba /= 255f;
        return rgba;
    }

    internal static Vector4 PackedColorToVector4(uint color)
        => new(
            (color & 0xFF) / 255f,
            ((color >> 8) & 0xFF) / 255f,
            ((color >> 16) & 0xFF) / 255f,
            ((color >> 24) & 0xFF) / 255f);
}