def print-notify [message: string] {

def print-notify [message: string, progress: int = -1] {

        let base_args = ["--appname=Theme Switch" "--replace=1002"]
        let args = if $progress >= 0 {
            $base_args | append ["--hints" $"int:value:($progress)"]
        } else {
            $base_args
        }

            ^dunstify --appname="Theme Switch" --urgency=critical --timeout=30000 "Error" $"($message)"

            ^dunstify ...$args --urgency=critical --timeout=30000 "Error" $"($message)"

            ^dunstify --appname="Theme Switch" "Status" $"($message)"

            ^dunstify ...$args --urgency=normal --timeout=30000 "Status" $"($message)"

    # Use provided theme.
    let new_theme = if $theme in ["light", "dark"] {
        $theme

    # determine current theme from nix theme file
    let theme_file = $"($env.HOME)/nixos/modules/common/theme.nix"
    let current_theme = try {
        let content = open $theme_file
        if ($content | str contains "is_dark = true;") {
            "dark"
        } else {
            "light"
        }
    } catch {
        "light"
    }
    # use provided theme or toggle current
    let new_theme = if $theme != null {
        if $theme in ["light", "dark"] {
            $theme
        } else {
            print $"Invalid theme: ($theme). Use 'light' or 'dark'"
            return
        }

        print-notify $"Invalid theme: '($theme)'. Use 'light' or 'dark'."

        print_notify $"Invalid theme: '($theme)'. Use 'light' or 'dark'."

    print-notify $"Switching to ($new_theme) theme."

    print_notify $"Switching to ($new_theme) theme."

    # Use NixOS specialisations for theme switching.
    # Always switch to base system first, then to target specialisation if needed.

    # update centralized theme file

        ^sudo /nix/var/nix/profiles/system/bin/switch-to-configuration switch

        let content = open $theme_file

        print-notify $"Activating ($new_theme) specialisation."
        if $new_theme == "dark" {
            ^sudo /run/current-system/specialisation/dark-theme/bin/switch-to-configuration switch

        let updated = if $new_theme == "dark" {
            $content | str replace "is_dark = false;" "is_dark = true;"

            ^sudo /run/current-system/specialisation/light-theme/bin/switch-to-configuration switch

            $content | str replace "is_dark = true;" "is_dark = false;"

        $updated | save $theme_file --force
        print $"updated theme to ($new_theme)"

        print-notify $"Error when switching theme: ($e.msg)"

        print_notify $"Failed to switch theme: ($e.msg)"

    print-notify "Updating environment..." 75

        print-notify "Dark mode activated."

        print_notify "Dark mode activated."

        print-notify "Light mode activated."

        print_notify "Light mode activated."

    # rebuild nixos config to apply themes
    print "Rebuilding nixos config to apply themes... (this may take a moment)"
    nu $"($env.HOME)/rebuild.nu"

    print-notify $"Theme switch to ($new_theme) completed!"

    print-notify $"Theme switch to ($new_theme) completed!" 100
}
def print_notify [message: string] {
    print $"[Theme Switcher]: ($message)"
    if (which dunstify | is-not-empty) {
        ^dunstify "[Theme Switcher]" $"($message)"
    }