# Fish shell configuration - batteries included
# A comprehensive, quality-of-life focused fish setup with useful plugins
{
  inputs,
  lib,
  config,
  pkgs,
  ...
}: {
  programs.fish = {
    enable = true;

    # ═══════════════════════════════════════════════════════════════════════════
    # SHELL ALIASES
    # ═══════════════════════════════════════════════════════════════════════════
    shellAliases = {
      # Navigation
      ".." = "cd ..";
      "..." = "cd ../..";
      "...." = "cd ../../..";
      "....." = "cd ../../../..";

      # Listings (eza integration handled by programs.eza)
      ll = "ls -la";
      la = "ls -a";
      lt = "ls --tree";

      # Git shortcuts
      gs = "git status";
      gd = "git diff";
      gds = "git diff --staged";
      ga = "git add";
      gc = "git commit";
      gp = "git push";
      gl = "git pull";
      glog = "git log --oneline --graph --decorate";
      gco = "git checkout";
      gb = "git branch";

      # Nix shortcuts
      nix-gc = "nix-collect-garbage -d";
      nix-search = "nix search nixpkgs";
      nrs = "sudo nixos-rebuild switch --flake .";
      drs = "darwin-rebuild switch --flake .";
      hms = "home-manager switch --flake .";

      # Safety nets
      rm = "rm -i";
      cp = "cp -i";
      mv = "mv -i";

      # Modern replacements (when available)
      cat = "bat --paging=never";
      grep = "rg";
      find = "fd";

      # Misc
      c = "clear";
      q = "exit";
      h = "history";
      j = "jobs -l";
      path = "echo $PATH | tr ':' '\\n'";
      week = "date +%V";
      myip = "curl -s https://ipinfo.io/ip";
    };

    # ═══════════════════════════════════════════════════════════════════════════
    # SHELL ABBREVIATIONS (expand as you type, more powerful than aliases)
    # ═══════════════════════════════════════════════════════════════════════════
    shellAbbrs = {
      # Git abbreviations (expand to full commands)
      gst = "git status";
      gaa = "git add --all";
      gcm = "git commit -m";
      gca = "git commit --amend";
      gcan = "git commit --amend --no-edit";
      gpf = "git push --force-with-lease";
      grb = "git rebase";
      grbi = "git rebase -i";
      gsta = "git stash";
      gstp = "git stash pop";

      # Docker
      dps = "docker ps";
      dpa = "docker ps -a";
      di = "docker images";
      dcu = "docker-compose up";
      dcd = "docker-compose down";

      # Kubernetes
      k = "kubectl";
      kg = "kubectl get";
      kd = "kubectl describe";
      kl = "kubectl logs";
      kx = "kubectl exec -it";
    };

    # ═══════════════════════════════════════════════════════════════════════════
    # CUSTOM FUNCTIONS
    # ═══════════════════════════════════════════════════════════════════════════
    functions = {
      # Create directory and cd into it
      mkcd = "mkdir -p $argv[1]; and cd $argv[1]";

      # Quick extract - handles multiple archive formats
      extract = ''
        if test -f $argv[1]
          switch $argv[1]
            case '*.tar.bz2'
              tar xjf $argv[1]
            case '*.tar.gz'
              tar xzf $argv[1]
            case '*.tar.xz'
              tar xJf $argv[1]
            case '*.bz2'
              bunzip2 $argv[1]
            case '*.rar'
              unrar x $argv[1]
            case '*.gz'
              gunzip $argv[1]
            case '*.tar'
              tar xf $argv[1]
            case '*.tbz2'
              tar xjf $argv[1]
            case '*.tgz'
              tar xzf $argv[1]
            case '*.zip'
              unzip $argv[1]
            case '*.Z'
              uncompress $argv[1]
            case '*.7z'
              7z x $argv[1]
            case '*'
              echo "'$argv[1]' cannot be extracted via extract()"
          end
        else
          echo "'$argv[1]' is not a valid file"
        end
      '';

      # Git clone and cd
      gcl = ''
        git clone $argv[1]
        cd (basename $argv[1] .git)
      '';

      # Quick backup file
      bak = "cp $argv[1] $argv[1].bak.(date +%Y%m%d_%H%M%S)";

      # Find process by name
      psg = "ps aux | grep -v grep | grep -i $argv[1]";

      # Quick HTTP server
      serve = ''
        set port (test -n "$argv[1]"; and echo $argv[1]; or echo 8000)
        echo "Serving on http://localhost:$port"
        python3 -m http.server $port
      '';

      # Weather
      weather = ''
        set location (test -n "$argv[1]"; and echo $argv[1]; or echo "")
        curl -s "wttr.in/$location?format=3"
      '';

      # Quick nix shell
      nsh = "nix-shell -p $argv";

      # Reload fish config
      reload = "source ~/.config/fish/config.fish; echo 'Fish config reloaded!'";

      # Show path entries one per line
      pathlist = "echo $PATH | tr ':' '\\n' | nl";

      # Create a quick note
      note = ''
        set note_dir "$HOME/notes"
        mkdir -p $note_dir
        set note_file "$note_dir/(date +%Y-%m-%d).md"
        if test -n "$argv"
          echo "- (date +%H:%M) $argv" >> $note_file
          echo "Note added to $note_file"
        else
          $EDITOR $note_file
        end
      '';

      # Show disk usage for current directory, sorted
      duf = "du -sh * 2>/dev/null | sort -h";


    };

    # ═══════════════════════════════════════════════════════════════════════════
    # PLUGINS - Curated selection for productivity
    # ═══════════════════════════════════════════════════════════════════════════
    plugins = with pkgs.fishPlugins; [
      # ── Directory Navigation ──────────────────────────────────────────────────
      # z: Jump to frequently used directories (like autojump/zoxide but pure fish)
      { name = "z"; src = z.src; }

      # ── Fuzzy Finding ─────────────────────────────────────────────────────────
      # fzf-fish: Superior fzf integration - Ctrl+R history, Ctrl+Alt+F files, Ctrl+V vars
      {
        name = "fuck.fzf.fish";
        src = pkgs.fetchFromGitHub {
          owner = "PatrickF1";
          repo = "fzf.fish";
          rev = "v10.3";
          hash = "sha256-T8KYLA/r/gOKvAivKRoeqIwE2pINlxFQtZJHpOy9GMM=";
        };
      }

      { name = "tide"; src = tide.src; }

      # forgit: Interactive git with fzf (ga, glo, gi, gd, grh, gcf, gss, gclean)
      { name = "forgit"; src = forgit.src; }

      # ── Quality of Life ───────────────────────────────────────────────────────
      # autopair: Auto-insert matching brackets, quotes, etc.
      { name = "autopair"; src = autopair.src; }

      # done: Notifications when long-running commands complete
      { name = "done"; src = done.src; }

      # sponge: Remove failed commands and typos from history automatically
      { name = "sponge"; src = sponge.src; }

      # puffer: Text expansions (!! for last command, !$ for last argument)
      { name = "puffer"; src = puffer.src; }

      # colored-man-pages: Colorize man pages for better readability
      { name = "colored-man-pages"; src = colored-man-pages.src; }

      # ── Git Enhancement ───────────────────────────────────────────────────────
      # plugin-git: Git aliases and status helpers (similar to oh-my-zsh git)
      { name = "plugin-git"; src = plugin-git.src; }

      # ── Shell Compatibility ───────────────────────────────────────────────────
      # bass: Run bash scripts and capture environment changes
      { name = "bass"; src = bass.src; }

      # foreign-env: Source files from other shells (bash, zsh env files)
      { name = "foreign-env"; src = foreign-env.src; }

      # ── Utility ───────────────────────────────────────────────────────────────
      # grc: Colorize output of common commands (ping, traceroute, make, etc.)
      { name = "grc"; src = grc.src; }
    ];

    # ═══════════════════════════════════════════════════════════════════════════
    # INTERACTIVE SHELL INITIALIZATION
    # ═══════════════════════════════════════════════════════════════════════════
    interactiveShellInit = ''
      echo "🐟 "(set_color cyan)(whoami)(set_color normal)" @ "(set_color yellow)(hostname -s)(set_color normal)" in "(set_color green)(prompt_pwd)(set_color normal)
    '';

    # ═══════════════════════════════════════════════════════════════════════════
    # SHELL INIT (runs for all shells, including non-interactive)
    # ═══════════════════════════════════════════════════════════════════════════
    shellInit = ''
      # Ensure locale is set properly for UTF-8
      if test -z "$LANG"
        set -gx LANG en_US.UTF-8
      end
      if test -z "$LC_ALL"
        set -gx LC_ALL en_US.UTF-8
      end
    '';

    # ═══════════════════════════════════════════════════════════════════════════
    # LOGIN SHELL INIT
    # ═══════════════════════════════════════════════════════════════════════════
    loginShellInit = ''
      # Add any login-specific initialization here
      # This runs only for login shells
    '';
  };

  # ═════════════════════════════════════════════════════════════════════════════
  # ADDITIONAL PACKAGES needed for fish plugins and functions
  # ═════════════════════════════════════════════════════════════════════════════
  home.packages = with pkgs; [
    grc                 # Generic colorizer (for grc plugin)
    libnotify           # For done plugin notifications (Linux)
  ] ++ lib.optionals pkgs.stdenv.isDarwin [
    terminal-notifier   # For done plugin notifications (macOS)
  ];
}