{
  pkgs,
  lib,
  config,
  ...
}:
{
  home-manager.users.kalle = {
    qt = {
      enable = true;
      platformTheme.name = "qtct";
    };

    home.packages = with pkgs.kdePackages; [
      # Install both breeze5 and breeze6 since qt5 is still very commonplace.
      # Use the qt5 output instead of libsForQt5 to prevent package collisions.
      breeze
      breeze.qt5

      # The HM qt module does not actually seem to ship wayland support by default.
      qtwayland # for qt6
      pkgs.libsForQt5.qtwayland # for qt5
    ];

    xdg.configFile =
      let
        toStr = builtins.toString;
        toINI = lib.generators.toINI { };
        confDir = v: "qt${toStr v}ct";
        confFile = v: "${confDir v}/qt${toStr v}ct.conf";
        colorsFile = v: "${confDir v}/colors/catppuccin-mocha-blue-breeze.conf";
        absColorsFile = v: "${config.home-manager.users.kalle.xdg.configHome}/${colorsFile v}";

        sharedConf = {
          Appearance = {
            custom_palette = "true";
            icon_theme = "breeze-dark";
            standard_dialogs = "default";
            style = "Breeze";
          };
          Interface = {
            activate_item_on_single_click = "1";
            buttonbox_layout = "0";
            cursor_flash_time = "1000";
            dialog_buttons_have_icons = "1";
            double_click_interval = "400";
            keyboard_scheme = "2";
            menus_have_icons = "true";
            show_shortcuts_in_context_menus = "true";
            toolbutton_style = "4";
            underline_shortcut = "1";
            wheel_scroll_lines = "3";
          };
          Troubleshooting = {
            force_raster_widgets = "1";
          };
        };

        # qt6 expects slightly different config values from qt5 for color schemes.
        # In the case of colorschemes (assuming we aim for a consistent coloring
        # between both versions) these differences are only at the end. Not
        # entirely sure what changes but I have checked that this is also consist
        # with what happens in Breeze and Catppuccin-KDE and as far as I can tell
        # the theme is consist between qt5 and qt6 apps, so whatever.
        colorsConf = v: {
          ColorScheme = {
            active_colors =
              "#ffcdd6f4, #ff313244, #ff3d3d5e, #ff2f2f48, #ff0c0c12, #ff151520, #ffcdd6f4, #ffcdd6f4, #ffcdd6f4, #ff1e1e2e, #ff181825, #ff09090d, #ff89b4fa, #ff11111b, #ff89b4fa, #ffcba6f7, #ff181825, #ffffffff, #ff1e1e2e, #ffcdd6f4, "
              + "${if v == 5 then "#806c7086" else "#ffa6adc8, #ff89b4fa"}";
            disabled_colors =
              "#ff6c7086, #ff313244, #ff45475a, #ff313244, #ff11111b, #ff181825, #ff6c7086, #ffcdd6f4, #ff6c7086, #ff1e1e2e, #ff181825, #ff11111b, #ff181825, #ff6c7086, #ffa9bcdb, #ffc7cceb, #ff181825, #ffffffff, #ff1e1e2e, #ffcdd6f4, #806c7086"
              + "${if v == 5 then "" else ", #ff181825"}";
            inactive_colors =
              "#ffcdd6f4, #ff313244, #ff3d3d5e, #ff2f2f48, #ff0c0c12, #ff151520, #ffcdd6f4, #ffcdd6f4, #ffcdd6f4, #ff1e1e2e, #ff181825, #ff09090d, #ff89b4fa, #ff11111b, #ff89b4fa, #ffcba6f7, #ff181825, #ffffffff, #ff1e1e2e, #ffcdd6f4, #806c7086, "
              + "${if v == 5 then "#806c7086" else "#ffa6adc8, #ff89b4fa"}";
          };
        };
      in
      {
        "${confFile 5}".text = toINI (
          lib.recursiveUpdate sharedConf {
            Appearance = {
              color_scheme_path = absColorsFile 5;
            };
            Fonts = {
              fixed = "\"Noto Sans,10,-1,5,50,0,0,0,0,0,Regular\"";
              general = "\"Noto Sans,10,-1,5,50,0,0,0,0,0,Regular\"";
            };
          }
        );
        "${confFile 6}".text = toINI (
          lib.recursiveUpdate sharedConf {
            Appearance = {
              color_scheme_path = absColorsFile 6;
            };
            Fonts = {
              fixed = "\"Noto Sans,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1,Regular\"";
              general = "\"Noto Sans,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1,Regular\"";
            };
          }
        );

        "${colorsFile 5}".text = toINI (colorsConf 5);
        "${colorsFile 6}".text = toINI (colorsConf 6);
      };
  };

  kdeglobals = {
    UiSettings = {
      # Without setting specifically this key to this value, many config
      # values for Breeze both from kdeglobals and the qt colorscheme
      # are ignored when running outside of Plasma.
      ColorScheme = "*";
    };

    # The colors used here are the Catppuccin Mocha Blue colors. More specifically,
    # I stole them directly from the values the offical Catppuccin-KDE distribution
    # sets when you apply that theme inside KDE.
    "ColorEffects:Disabled" = {
      ChangeSelectionColor = "";
      Color = "30, 30, 46";
      ColorAmount = "0.3";
      ColorEffect = "2";
      ContrastAmount = "0.1";
      ContrastEffect = "0";
      Enable = "";
      IntensityAmount = "-1";
      IntensityEffect = "0";
    };

    "ColorEffects:Inactive" = {
      ChangeSelectionColor = "true";
      Color = "30, 30, 46";
      ColorAmount = "0.5";
      ColorEffect = "3";
      ContrastAmount = "0";
      ContrastEffect = "0";
      Enable = "true";
      IntensityAmount = "0";
      IntensityEffect = "0";
    };

    "Colors:Button" = {
      BackgroundAlternate = "137,180,250";
      BackgroundNormal = "49, 50, 68";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:Complementary" = {
      BackgroundAlternate = "17, 17, 27";
      BackgroundNormal = "24, 24, 37";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:Header" = {
      BackgroundAlternate = "17, 17, 27";
      BackgroundNormal = "24, 24, 37";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:Selection" = {
      BackgroundAlternate = "137,180,250";
      BackgroundNormal = "137,180,250";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "24, 24, 37";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "17, 17, 27";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:Tooltip" = {
      BackgroundAlternate = "27,25,35";
      BackgroundNormal = "30, 30, 46";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:View" = {
      BackgroundAlternate = "24, 24, 37";
      BackgroundNormal = "30, 30, 46";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };

    "Colors:Window" = {
      BackgroundAlternate = "17, 17, 27";
      BackgroundNormal = "24, 24, 37";
      DecorationFocus = "137,180,250";
      DecorationHover = "49, 50, 68";
      ForegroundActive = "250, 179, 135";
      ForegroundInactive = "166, 173, 200";
      ForegroundLink = "137,180,250";
      ForegroundNegative = "243, 139, 168";
      ForegroundNeutral = "249, 226, 175";
      ForegroundNormal = "205, 214, 244";
      ForegroundPositive = "166, 227, 161";
      ForegroundVisited = "203, 166, 247";
    };
  };
}