{
  inputs,
  ...
}:
{
  flake.modules.nixos.shell =
    { pkgs, ... }:
    {
      programs.fish.enable = true;
      users.defaultUserShell = pkgs.fish;

      home-manager.sharedModules = [
        inputs.self.modules.homeManager.shell
      ];
    };

  flake.modules.darwin.shell =
    { pkgs, ... }:
    {
      programs.fish.enable = true;
      users.defaultUserShell = pkgs.fish;

      home-manager.sharedModules = [
        inputs.self.modules.homeManager.shell
      ];
    };

  flake.modules.homeManager.shell =
    { pkgs, ... }:
    {
      programs.fish = {
        enable = true;
        functions = {
          fish_greeting = "fortune -a";
          localip = "ifconfig | grep \"inet \" | grep -v 127.0.0.1 | awk '{print $2}' | head -n 1";
          publicip = "curl -4 ifconfig.me";
          enter_vps = "ssh dnsc-vps-sm -t tmux new -As main";
          rebuild_vps = "ssh -t dnsc-vps-sm 'cd ~/nix-config && git pull && sudo just deploy'";
          enter_server = "ssh dnsc-server -t tmux new -As main";
          rebuild_server = "ssh -t dnsc-server 'cd ~/nix-config && git pull && sudo just deploy'";
          kill_tunnels = /* fish */ ''
            ps -o pid,command | grep "^[0-9]\{4,5\} ssh -fNL" | awk '{print $1}' | xargs kill -9
          '';
          dbui = ''
            uvx --with PyMySQL --with sqlit-tui[ssh] --from sqlit-tui@1.2.11 sqlit
          '';
          dev_projects = /* fish */ ''
            if test "$hn" = "dnsc-work"
              begin
                fd . ~/dev/ride/apps/backend/edge-services -t d -d 1;
                fd . ~/dev/ride/apps/backend/backend-services -t d -d 1;
                fd . ~/dev/ride/apps/frontend/projects -t d -d 1;
                fd . ~/dev/ride/apps/native -t d -d 1;
                fd . ~/dev/ride/packages -t d -d 1;
                fd . ~/dev -t d -d 1;
                echo "$HOME/dev/ride/apps/frontend";
                echo "$HOME/dev/ride/apps/lib";
                echo "$HOME/dev/ride/apps/packages";
              end
            else
              begin
                echo "$HOME/notes"
                fd . ~/dev -t d -d 1
              end
            end
          '';
          cdd = /* fish */ ''
            set folder (dev_projects | fzf)
            cd $folder
          '';
          cdr = /* fish */ ''
            set folder (dev_projects | fzf)
            cd $folder

            if test -n "$folder"
              set service (basename $folder)
              cd $folder
              
              if test -f "package.json"
                set script_cmd (jq -r '.scripts | to_entries | .[] | "\(.key): \(.value)"' package.json | fzf)
                
                if test -n "$script_cmd"
                  set script_name (string split ": " $script_cmd)[1]
                  if test -n "$script_name"
                    echo "Running: npm run $script_name"
                    npm run $script_name
                  end
                end
              end
            end
          '';
          sessionizer = /* fish */ ''
            set -l selected (tmuxinator ls -n | tail -n +2 | fzf --prompt " switch to >> ")

            if test -z "$selected"
              return 1
            end

            tmuxinator start "$selected"
          '';
          tmux_sessionizer = /* fish */ ''
            tmux display-popup -h 50% -w 80% -E sessionizer
          '';
          nn = /* fish */ ''
            # Require a title argument
            if test (count $argv) -lt 1
                echo "Usage: nn \"My Note\""
                return 1
            end

            # Join all arguments into single title (preserves spaces inside quotes)
            set -l title $argv[1]

            # Timestamp up to minutes, format: YYYY-MM-DD_HH-MM
            set -l ts (date "+%Y%m%d%H%M")

            # Normalize title: lowercase, replace spaces with hyphens, remove/replace
            # characters unsafe for filenames (keep a-z0-9- and replace others with -)
            set -l slug (string lower -- $title)
            # Replace any sequence of non-alphanumeric characters with single hyphen
            set -l slug (echo $slug | sed -E 's/[^a-z0-9]+/-/g' | sed -E 's/^-|-$//g')

            # Compose filename
            set -l filename "$ts"_"$slug.md"

            # Directory for notes (change if you prefer another path)
            set -l notes_dir ~/dev/notes

            # Ensure directory exists
            test -d $notes_dir; or mkdir -p $notes_dir

            # Full path
            set -l fullpath "$notes_dir/$filename"

            # If file doesn't exist, create with timestamp and title at top
            if not test -f $fullpath
                # Human-friendly timestamp line (no seconds)
                set -l display_ts (date "+%Y-%m-%d %H:%M")
                printf "---\nCREATED_AT: %s\n---\n\n# %s\n\n" "$display_ts" "$title" > $fullpath
            end

            # Open file in neovim
            nvim $fullpath
          '';
          fish_mode_prompt = /* fish */ ''
            switch $fish_bind_mode
              case default
                set_color --bold brcyan
                echo '[N] '
              case insert
                set_color --bold brgreen
                echo '[I] '
              case replace_one
                set_color --bold yellow
                echo '[R] '
              case replace
                set_color --bold bryellow
                echo '[R] '
              case visual
                set_color --bold brmagenta
                echo '[V] '
              case '*'
                set_color --bold red
                echo '[?] '
            end
            set_color normal
          '';
          setup_winterly_theme_colors = /* fish */ ''
            set --universal fish_color_autosuggestion brblack # autosuggestions
            set --universal fish_color_command        brwhite # commands
            set --universal fish_color_comment        brblack # code comments
            set --universal fish_color_cwd            brblack # current working directory in the default prompt
            set --universal fish_color_end            brblack # process separators like ';' and '&'
            set --universal fish_color_error          brwhite # highlight potential errors
            set --universal fish_color_escape         brblack # highlight character escapes like '\n' and '\x70'
            set --universal fish_color_match          yellow # highlight matching parenthesis
            set --universal fish_color_normal         brwhite # default color
            set --universal fish_color_operator       brblack # parameter expansion operators like '*' and '~'
            set --universal fish_color_param          bryellow # regular command parameters
            set --universal fish_color_quote          brmagenta # quoted blocks of text
            set --universal fish_color_redirection    brwhite # IO redirections
            set --universal fish_color_search         --bold --background=black --foreground=bryellow
            set --universal fish_color_search_match   --background black # highlight history search matches and the selected pager item (must be a background)
            set --universal fish_pager_color_selected_background  --background black --foreground brmagenta 
            set --universal fish_pager_color_progress --foreground=brwhite --background=black
            set --universal fish_color_selection      --background magenta  # when selecting text (in vi visual mode)
            set --universal fish_color_cancel         brblack # the '^C' indicator on a canceled command
            set --universal fish_color_host           brwhite # current host system in some of fish default prompts
            set --universal fish_color_host_remote    yellow #ayu:syntax.constant  current host system in some of fish default prompts, if fish is running remotely (via ssh or similar)
            set --universal fish_color_user           brwhite # current username in some of fish default prompts
          '';
          setup_homebrew = /* fish */ ''
            fish_add_path /opt/homebrew/bin

            if test -d (brew --prefix)"/share/fish/completions"
              set -p fish_complete_path (brew --prefix)/share/fish/completions
            end

            if test -d (brew --prefix)"/share/fish/vendor_completions.d"
              set -p fish_complete_path (brew --prefix)/share/fish/vendor_completions.d
            end
          '';
          setup_path = /* fish */ ''
            fish_add_path /run/wrappers/bin
            fish_add_path /run/current-system/sw/bin
            fish_add_path $HOME/.nix-profile/bin

            if test "$(uname)" = "Darwin"
              fish_add_path /nix/var/nix/profiles/default/bin
              setup_homebrew
            end
          '';
          setup_env = /* fish */ ''
            for line in (cat $HOME/.env | grep -v '^#')
                set item (string split -m 1 '=' $line)
                set -gx $item[1] $item[2]
            end
          '';
          setup_work = /* fish */ ''
            fish_add_path $ANDROID_HOME/emulator
            fish_add_path $ANDROID_HOME/platform-tools
            fish_add_path $HOME/.local/share/uv/tools
            rbenv init - | source
            fnm env --use-on-cd --shell fish | source
          '';
        };

        interactiveShellInit = /* fish */ ''
          # Set some global values
          set -x GPG_TTY (tty)
          set hn (prompt_hostname)

          fish_vi_key_bindings insert
          fish_vi_cursor xterm

          setup_winterly_theme_colors
          setup_env
          setup_path

          if test "$hn" = "dnsc-work"
            setup_work
          end

          # Custom init
          direnv hook fish | source

          # Auto start tmux
          if status is-interactive; and not set -q TMUX
            if tmux list-sessions >/dev/null 2>&1
              # Attach to the first available session
              tmux a
            else
              # Create a new session
              tmux new-session -t main
            end
          end
        '';

        shellAbbrs = {
          lg = "lazygit";
          gg = "lazygit";
          g = "git";
          frc = "source ~/.config/fish/**/*.fish";
        };
      };
    };
}