nixos/settings/stylix.nix

{ config, pkgs, lib, inputs, ... }:
{
  imports = [ inputs.stylix.nixosModules.stylix ];

  config = lib.mkIf (lib.elem config.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ]) {
    stylix = {
      enable = true;
      image = "${inputs.self}/walls/wallpaper.png";
      polarity = "dark";

      # Let stylix theme every target it supports. Per-target opt-outs go
      # under home-manager.users.fred.stylix.targets.<x>.enable = false.
      autoEnable = true;

      cursor = {
        package = pkgs.bibata-cursors;
        name = "Bibata-Modern-Ice";
        size = 24;
      };

      fonts = {
        monospace = {
          package = pkgs.nerd-fonts.fira-mono;
          name = "FiraMono Nerd Font";
        };
        sansSerif = {
          package = pkgs.inter;
          name = "Inter";
        };
        serif = {
          package = pkgs.inter;
          name = "Inter";
        };
      };
    };

    home-manager.users.fred = { config, lib, pkgs, ... }: let
      c = config.lib.stylix.colors;
      # Map matugen's Material You placeholders to the closest base16 slot
      # in stylix's palette. The mapping is approximate (Material You has
      # more semantic colours than base16), but covers the placeholders
      # used in our Zen userChrome and Vesktop quickCss templates.
      stylixize = builtins.replaceStrings
        [
          "{{colors.primary.default.hex}}"
          "{{colors.primary_container.default.hex}}"
          "{{colors.secondary_container.default.hex}}"
          "{{colors.tertiary_container.default.hex}}"
          "{{colors.surface.default.hex}}"
          "{{colors.surface_container.default.hex}}"
          "{{colors.surface_container_low.default.hex}}"
          "{{colors.surface_container_high.default.hex}}"
          "{{colors.on_surface.default.hex}}"
          "{{colors.on_surface_variant.default.hex}}"
          "{{colors.outline.default.hex}}"
          "{{colors.outline_variant.default.hex}}"
        ]
        [
          "#${c.base0D}" # primary accent
          "#${c.base02}" # primary container
          "#${c.base0C}" # secondary container (cyan)
          "#${c.base0E}" # tertiary container (purple)
          "#${c.base00}" # surface (main bg)
          "#${c.base01}" # surface container
          "#${c.base00}" # surface container low
          "#${c.base02}" # surface container high
          "#${c.base05}" # on surface (fg)
          "#${c.base04}" # on surface variant (muted fg)
          "#${c.base03}" # outline
          "#${c.base02}" # outline variant
        ];
    in {
      # Zen and Vesktop have no native stylix targets, so we keep the
      # existing matugen CSS templates and substitute placeholders with
      # stylix base16 colours at Nix-eval time.
      home.file.".zen/fraudek5.Default Profile/chrome/userChrome.css".text =
        stylixize (builtins.readFile "${inputs.self}/templates/zen-userChrome.css");

      home.file.".config/vesktop/settings/quickCss.css".text =
        stylixize (builtins.readFile "${inputs.self}/templates/vesktop-quickCss.css");

      # Folder icon recolor — was a matugen post-hook, now driven by
      # stylix's base16 palette. base0D is the conventional blue/accent
      # slot, which is what we want for Adwaita-style folder icons.
      home.activation.recolorFolders = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
        ICON_DIR="$HOME/.local/share/icons/WallpaperAdwaita"
        ADWAITA="/run/current-system/sw/share/icons/Adwaita"
        PAPIRUS="/run/current-system/sw/share/icons/Papirus-Dark"
        PRIMARY="#${config.lib.stylix.colors.base0D}"
        CACHE_FILE="$ICON_DIR/.color-cache"

        # Skip the SVG recolour pass if the palette colour hasn't changed.
        if [ -f "$CACHE_FILE" ] && [ "$(cat "$CACHE_FILE" 2>/dev/null)" = "$PRIMARY" ] && [ -d "$ICON_DIR/scalable/places" ]; then
          echo "recolorFolders: palette unchanged, skipping"
        else

        $DRY_RUN_CMD mkdir -p "$ICON_DIR/scalable/places"

        $DRY_RUN_CMD cat > "$ICON_DIR/index.theme" << 'THEME'
        [Icon Theme]
        Name=WallpaperAdwaita
        Comment=Adwaita with stylix-coloured folders and Papirus mimetypes
        Inherits=Adwaita,hicolor
        DisplayDepth=32

        [scalable/places]
        Size=128
        MinSize=16
        MaxSize=512
        Type=Scalable
        Context=Places

        [16x16/places]
        Size=16
        Type=Fixed
        Context=Places

        [22x22/places]
        Size=22
        Type=Fixed
        Context=Places

        [32x32/places]
        Size=32
        Type=Fixed
        Context=Places

        [48x48/places]
        Size=48
        Type=Fixed
        Context=Places

        [64x64/places]
        Size=64
        MinSize=32
        MaxSize=128
        Type=Scalable
        Context=Places

        [96x96/places]
        Size=96
        MinSize=64
        MaxSize=256
        Type=Scalable
        Context=Places

        [128x128/places]
        Size=128
        MinSize=64
        MaxSize=512
        Type=Scalable
        Context=Places

        [16x16/mimetypes]
        Size=16
        Type=Fixed
        Context=MimeTypes

        [22x22/mimetypes]
        Size=22
        Type=Fixed
        Context=MimeTypes

        [32x32/mimetypes]
        Size=32
        Type=Fixed
        Context=MimeTypes

        [48x48/mimetypes]
        Size=48
        Type=Fixed
        Context=MimeTypes

        [64x64/mimetypes]
        Size=64
        MinSize=32
        MaxSize=128
        Type=Scalable
        Context=MimeTypes

        [96x96/mimetypes]
        Size=96
        MinSize=64
        MaxSize=256
        Type=Scalable
        Context=MimeTypes

        [128x128/mimetypes]
        Size=128
        MinSize=64
        MaxSize=512
        Type=Scalable
        Context=MimeTypes
        THEME

        if [ -d "$ADWAITA/scalable/places" ]; then
          for svg in "$ADWAITA/scalable/places"/*.svg; do
            name=$(basename "$svg")
            $DRY_RUN_CMD sed \
              -e "s/#438de6/$PRIMARY/gi" \
              -e "s/#62a0ea/$PRIMARY/gi" \
              -e "s/#a4caee/$PRIMARY/gi" \
              -e "s/#afd4ff/$PRIMARY/gi" \
              -e "s/#c0d5ea/$PRIMARY/gi" \
              "$svg" > "$ICON_DIR/scalable/places/$name"
          done
        fi

        # Papirus has proper distinct folder icons for Downloads, Pictures,
        # Music, etc — copy and recolour them with the wallpaper accent so
        # we don't end up with a single generic folder everywhere.
        for size in 16x16 22x22 32x32 48x48 64x64 96x96 128x128; do
          if [ -d "$PAPIRUS/$size/places" ]; then
            $DRY_RUN_CMD rm -rf "$ICON_DIR/$size/places"
            $DRY_RUN_CMD mkdir -p "$ICON_DIR/$size/places"
            for svg in "$PAPIRUS/$size/places"/*.svg; do
              [ -f "$svg" ] || continue
              name=$(basename "$svg")
              $DRY_RUN_CMD sed \
                -e "s/#5294e2/$PRIMARY/gi" \
                -e "s/#4877b1/$PRIMARY/gi" \
                -e "s/#729fcf/$PRIMARY/gi" \
                -e "s/#689ad6/$PRIMARY/gi" \
                "$svg" > "$ICON_DIR/$size/places/$name"
            done
          fi
        done

        for size in 16x16 22x22 32x32 48x48 64x64 96x96 128x128; do
          if [ -d "$PAPIRUS/$size/mimetypes" ]; then
            $DRY_RUN_CMD rm -rf "$ICON_DIR/$size/mimetypes"
            $DRY_RUN_CMD mkdir -p "$ICON_DIR/$size/mimetypes"
            $DRY_RUN_CMD cp -rL "$PAPIRUS/$size/mimetypes"/* "$ICON_DIR/$size/mimetypes/"
          fi
        done

        $DRY_RUN_CMD ${pkgs.gtk3}/bin/gtk-update-icon-cache -f "$ICON_DIR" 2>/dev/null || true
        $DRY_RUN_CMD sh -c "echo '$PRIMARY' > '$CACHE_FILE'"
        fi # end palette-changed block
      '';
    };
  };
}