HellionChat/HellionChat/Ui/Components/Settings/FontsSection.cs

using Dalamud;
using Dalamud.Bindings.ImGui;
using Dalamud.Interface.FontIdentifier;
using HellionChat.Resources;
using HellionChat.Util;

namespace HellionChat.Ui.Components.Settings;

// Restores the 1.5.6 font-selection UI (1d3b429:Appearance.cs:249-405): pick the
// bundled Hellion font vs a custom global/Japanese/italic font, sizes, and extra
// glyph ranges. v1.6.0 saves live, so any change persists and rebuilds the atlas
// at once (RebuildDelegateFonts, unconditional — a face change keeps the size, so
// the size-gated IfChanged path would miss it).
internal sealed class FontsSection
{
    private readonly Plugin _plugin;
    private readonly FontManager _fontManager;

    public FontsSection(Plugin plugin, FontManager fontManager)
    {
        _plugin = plugin;
        _fontManager = fontManager;
    }

    private void Apply()
    {
        _plugin.SaveConfig();
        _fontManager.RebuildDelegateFonts();
    }

    public void Draw()
    {
        if (!ImGui.CollapsingHeader(HellionStrings.Settings_Section_Fonts))
            return;

        // Readout so the user can see which font is actually active.
        var active =
            Plugin.Config.UseHellionFont ? "Hellion Inter (bundled)"
            : Plugin.Config.FontsEnabled
                ? $"Global: {Plugin.Config.GlobalFontV2.FontId.Family.EnglishName}"
            : "FFXIV game font";
        ImGui.TextDisabled($"Active: {active}");
        ImGui.Spacing();

        if (
            ImGui.Checkbox(
                HellionStrings.Theme_UseHellionFont_Name,
                ref Plugin.Config.UseHellionFont
            )
        )
        {
            if (Plugin.Config.UseHellionFont)
                Plugin.Config.FontsEnabled = false;
            Apply();
        }
        ImGuiUtil.HelpMarker(HellionStrings.Theme_UseHellionFont_Description);
        ImGui.Spacing();

        if (Plugin.Config.UseHellionFont)
        {
            DrawSizeCombo(Language.Options_FontSize_Name, ref Plugin.Config.FontSizeV2);
            ImGui.Spacing();
        }
        else if (ImGui.Checkbox(Language.Options_FontsEnabled, ref Plugin.Config.FontsEnabled))
        {
            Apply();
        }

        var unused = false;
        if (!Plugin.Config.UseHellionFont && !Plugin.Config.FontsEnabled)
        {
            DrawSizeCombo(Language.Options_FontSize_Name, ref Plugin.Config.FontSizeV2);
        }
        else if (!Plugin.Config.UseHellionFont)
        {
            DrawFontChooser(
                Language.Options_Font_Name,
                Plugin.Config.GlobalFontV2,
                false,
                ref unused,
                spec => Plugin.Config.GlobalFontV2 = spec,
                () => Plugin.Config.GlobalFontV2 = DefaultFont(DalamudAsset.NotoSansCjkRegular),
                "global"
            );
            ImGuiUtil.HelpMarker(
                string.Format(Language.Options_Font_Description, Plugin.PluginName)
            );
            ImGuiUtil.WarningText(Language.Options_Font_Warning);
            ImGui.Spacing();

            DrawFontChooser(
                Language.Options_JapaneseFont_Name,
                Plugin.Config.JapaneseFontV2,
                false,
                ref unused,
                spec => Plugin.Config.JapaneseFontV2 = spec,
                () => Plugin.Config.JapaneseFontV2 = DefaultFont(DalamudAsset.NotoSansCjkMedium),
                "japanese",
                id => !id.LocaleNames?.ContainsKey("ja-jp") ?? false,
                "いろはにほへと   ちりぬるを"
            );
            ImGuiUtil.HelpMarker(
                string.Format(Language.Options_JapaneseFont_Description, Plugin.PluginName)
            );
            ImGui.Spacing();

            DrawFontChooser(
                Language.Options_ItalicFont_Name,
                Plugin.Config.ItalicFontV2,
                true,
                ref Plugin.Config.ItalicEnabled,
                spec => Plugin.Config.ItalicFontV2 = spec,
                () =>
                {
                    Plugin.Config.ItalicEnabled = false;
                    Plugin.Config.ItalicFontV2 = DefaultFont(DalamudAsset.NotoSansCjkRegular);
                },
                "italic"
            );
            ImGuiUtil.HelpMarker(
                string.Format(Language.Options_Italic_Description, Plugin.PluginName)
            );
            ImGui.Spacing();
        }

        // ExtraGlyphRanges stays reachable regardless of the font source so the
        // user can verify/override the per-language auto-activation (v1.5.3 note).
        ImGui.Spacing();
        if (ImGui.CollapsingHeader(Language.Options_ExtraGlyphs_Name))
        {
            ImGuiUtil.HelpMarker(
                string.Format(Language.Options_ExtraGlyphs_Description, Plugin.PluginName)
            );

            var range = (int)Plugin.Config.ExtraGlyphRanges;
            var changed = false;
            foreach (var extra in Enum.GetValues<ExtraGlyphRanges>())
                changed |= ImGui.CheckboxFlags(extra.Name(), ref range, (int)extra);

            if (changed)
            {
                Plugin.Config.ExtraGlyphRanges = (ExtraGlyphRanges)range;
                Apply();
            }
        }

        DrawSizeCombo(Language.Options_SymbolsFontSize_Name, ref Plugin.Config.SymbolsFontSizeV2);
        ImGuiUtil.HelpMarker(Language.Options_SymbolsFontSize_Description);
        ImGui.Spacing();
    }

    private void DrawSizeCombo(string label, ref float size)
    {
        var before = size;
        ImGuiUtil.FontSizeCombo(label, ref size);
        if (!size.Equals(before))
            Apply();
    }

    private void DrawFontChooser(
        string label,
        SingleFontSpec font,
        bool checkbox,
        ref bool checkboxValue,
        Action<SingleFontSpec> set,
        Action reset,
        string resetId,
        Predicate<IFontFamilyId>? exclusion = null,
        string? preview = null
    )
    {
        var prevCheckbox = checkboxValue;
        var chooser = ImGuiUtil.FontChooser(
            label,
            font,
            checkbox,
            ref checkboxValue,
            exclusion,
            preview
        );
        if (checkbox && checkboxValue != prevCheckbox)
            Apply();

        // The chooser dialog resolves on a worker thread; marshal the result back
        // onto the framework thread before touching config + the font atlas.
        chooser?.ResultTask.ContinueWith(r =>
        {
            if (r.IsCompletedSuccessfully)
                Plugin.Framework.Run(() =>
                {
                    set(r.Result);
                    Apply();
                });
        });

        ImGui.SameLine();
        if (ImGui.Button($"Reset##{resetId}"))
        {
            reset();
            Apply();
        }
    }

    private static SingleFontSpec DefaultFont(DalamudAsset asset) =>
        new() { FontId = new DalamudAssetFontAndFamilyId(asset), SizePt = 12.75f };
}