{ pkgs, ... }:

{
  users.defaultUserShell = pkgs.fish;
  environment.shells = [ pkgs.fish ];

  programs.fish = {
    enable = true;

    shellAliases = {
      ls = "exa --group-directories-first -I 'lost+found'";
      tree =
        "exa --group-directories-first --all --long --tree -I 'node_modules|.git|public|lost+found'";
      mv = "mv -i";
      rg = "rg --max-columns=2000";
      yarn = "yarn --emoji true";
    };

    shellAbbrs = {
      g = "git";
      ga = "git add";
      gaa = "git add --all";
      gap = "git add --patch";
      gb = "git branch"; # List all branches
      gc = "git commit -m";
      gca = "git commit --amend";
      gcl = "git clone";
      gco = "git checkout";
      gd = "git diff"; # Show all file changes not staged yet
      gds = "git diff --staged"; # Show changes staged but not committed
      gi = "git init";
      gl = "git log --oneline --decorate --all --graph -n 10";
      gm = "git merge";
      gp = "git push"; # Push your commits to a remote server
      gr = "git reset HEAD~"; # Undo the last commit but keep changed files
      gra = "git remote add";
      gre = "git remote --verbose"; # List all remotes
      grh = "git reset HEAD";
      grr =
        "git reset --hard HEAD~"; # Remove the last commit and all changes with it
      gs = "git status";
      gst = "git stash";
      gstp = "git stash pop";
      gt = "git tag";
      gts = "git tag -s";

      y = "yarn";
      ya = "yarn add";
      yar = "yarn remove";
      yi = "yarn init";
      yin = "yarn install";
      yu = "yarn upgrade-interactive";

      dl = "yt-dlp";
      vol =
        "wpctl set-volume '@DEFAULT_AUDIO_SINK@'"; # Change the volume, e.g. vol 10%+, vol 10%-, vol 100%
      cf = "tput reset"; # Clear the terminal completely
      nf = "tput reset; and neofetch --size 56%";
      df = "df --human-readable --type=ext4 --total";
      du = "du --human-readable --summarize";
      jis =
        "recode shift_jis..utf8"; # Easily convert shift_jis-encoded files to utf8
      utf16 =
        "recode utf16..utf8"; # Rarely, some files from Japan are utf16 instead
      jp = "LANG=ja_JP.UTF-8 LC_ALL=ja_JP.UTF-8";

      c = "clear"; # Because 5 letters is too much
      e = "exit";
      k = "kitty @ set-colors -c -a ~/.cache/wal/kitty";
      l = "ls -l";
      r = "ranger";
      w = "wal -o ~/.config/wal/done.sh";
      T = "tree";
    };
  };

  home-manager.sharedModules = [{
    xdg.configFile."fish/config.fish".text = ''
      set -U fish_greeting ""

      export PATH="$HOME/.deno/bin:$HOME/.cargo/bin:$HOME/.yarn/bin:$HOME/.local/bin:$HOME/.go/bin:$PATH"
      export GOPATH="$HOME/.go"
      export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.socket"
      export TERMCMD="kitty --single-instance"

      # Required to make gpg-agent work in cases like git commit
      export GPG_TTY=(tty)

      # Add color to man pages
      set -x -U LESS_TERMCAP_md (printf "\e[01;31m")
      set -x -U LESS_TERMCAP_me (printf "\e[0m")
      set -x -U LESS_TERMCAP_se (printf "\e[0m")
      set -x -U LESS_TERMCAP_so (printf "\e[01;44;30m")
      set -x -U LESS_TERMCAP_ue (printf "\e[0m")
      set -x -U LESS_TERMCAP_us (printf "\e[01;32m")

      # Always use the default keybindings in fish
      fish_default_key_bindings

      # Convert unnecessarily large wav files to flac
      function wav2flac
          set ORIGINAL_SIZE (du -hs | cut -f1)

          fd -e wav -x ffmpeg -i "{}" -loglevel quiet -stats "{.}.flac"
          fd -e wav -X trash

          set NEW_SIZE (du -hs | cut -f1)

          echo "Done. Reduced file size from $ORIGINAL_SIZE to $NEW_SIZE"
      end

      # Convert wav/flac to opus
      function opus
          set ORIGINAL_SIZE (du -hs | cut -f1)

          fd -e wav -e flac -x ffmpeg -i "{}" -c:a libopus -b:a 128K -loglevel quiet -stats "{.}.opus"
          fd -e wav -e flac -X rm -I

          set NEW_SIZE (du -hs | cut -f1)

          echo "Done. Reduced file size from $ORIGINAL_SIZE to $NEW_SIZE"
      end

      # Always use kitty ssh since it's our default terminal
      if string match -qe -- "/dev/pts/" (tty)
          alias ssh="kitty +kitten ssh"
      end

      if status is-login
          if test -z "$DISPLAY" -a "$XDG_VTNR" = 1
              exec Hyprland
          end
      end
    '';
  }];
}