# Add Home Manager's channel
nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager
# This sets up a channel named home-manager following Nixpkgs master.

# Update our channels. This command fetches the latest changes from the channels we have subscribed to.
sudo nix-channel --update

# Since we’re using Home Manager as a NixOS module (integrate into configuration.nix or a separated file imported by it),
# we just need to rebuild the system to update all channels (apply the updates):
sudo nixos-rebuild switch
# After this step, Home Manager is ready to be used alongside the system configuration.

# To list all channels that are available in our system:
sudo nix-channel --list
# To remove a channel, type the following command:
sudo nix-channel --remove channel-alias
# Replace channel-alias with the name of the channel you want to remove.

{ config, pkgs, ... }:

{
  # This command allows using global packages to avoid duplications
  home-manager.useGlobalPkgs = true;
  home-manager.useUserPackages = true; # Enables user-specific packages in Home Manager.
  home-manager.backupFileExtension = "backup"; # Extension for backup files generated by Home Manager

  # Configuration settings for the user 'nmaximo7'
  home-manager.users.nmaximo7 = { pkgs, ... }:
  let # It uses a let expression to define variables (username, dotfiles) so we can reuse it throughout the configuration.
    username = "nmaximo7";  # Set the username variable
    dotfiles = "/home/${username}/dotfiles"; # Path to the user's dotfiles directory
  in {
    # User-level packages to be installed via Home Manager
    home.packages = with pkgs; [
      cowsay # Fun command-line utility that generates ASCII art.
      fastfetch # An actively maintained, feature-rich neofetch like system information tool.
      lshw # Hardware listing tool.
      # Add more user-level packages as desired or needed.
    ];

    home.stateVersion = "25.05";  # Specify the version of Home Manager. Remember to update it as needed for compatibility

    home.username = username; # Set the Home Manager's username
    home.homeDirectory = "/home/${username}"; # Set the user's home directory path

    # Include other configuration files from the dotfiles directory
    imports = [
      "${dotfiles}/shell.nix" # Shell configuration
      "${dotfiles}/kitty.nix" # Kitty terminal configuration
      "${dotfiles}/zsh.nix" # Zsh shell configuration
      "${dotfiles}/alacritty.nix" # Alacritty terminal configuration
      "${dotfiles}/rofi.nix" # Rofi application launcher configuration
      "${dotfiles}/vscode.nix" # VSCode configuration
      # Add other configuration files as needed
    ];

    # Enable Home Manager to manage its own configuration
    programs.home-manager.enable = true;

    # Links to Espanso, i3, i3status, Picom, and Fastfetch configuration files
    home.file.".config/espanso/match/base.yml".source = "/home/${username}/dotfiles/base.yml";
    home.file.".config/i3/config".source = "/home/${username}/dotfiles/i3/config";
    home.file.".config/i3status/i3status.conf".source = "/home/${username}/dotfiles/i3/i3status.conf";
    home.file.".config/picom/picom.conf".source = "/home/${username}/dotfiles/i3/picom.conf";
    home.file.".config/fastfetch/config.jsonc".source = "/home/${username}/dotfiles/fastfetch/config.jsonc";
  };
}

{ config, pkgs, ... }:

{
  programs.neovim = {
    # Ensure Neovim is installed and enabled in your NixOS system.
    enable = true;

    # Specify the Neovim package version and enable Python support
    withPython3 = true;
    extraPython3Packages = ps: with ps; [ pynvim ];

    # Configuration for Neovim
    extraConfig = ''
      " Set leader key
      let mapleader = " "  " Use space as the leader key

      " General settings
      set number " Show line numbers
      set relativenumber " Show relative line numbers
      set tabstop=4 " Number of spaces per tab
      set shiftwidth=4 " Number of spaces for autoindent
      set expandtab " Convert tabs to spaces
      set nowrap " Disable line wrapping

      " Enable syntax highlighting
      syntax on

      " Set the colorscheme to gruvbox
      colorscheme gruvbox

      " Key mappings
      nnoremap n :NERDTreeToggle  " Toggle NERDTree
      nnoremap f :FZF  " Open FZF
    '';

    # Specify additional plugins if needed
    plugins = with pkgs.vimPlugins; [
      # Add any additional plugins here
      vim-sensible # This is a collection of default settings and sensible defaults for Vim.
      nerdtree # A file explorer plugin for Vim/Neovim that provides a tree view of your files and directories.
      fzf-vim # A Vim plugin that integrates fzf, a fast fuzzy file finder.
      # It allows users to quickly search for files, buffers, and more using fuzzy matching.
      gruvbox
      # A popular color scheme for Vim/Neovim that provides a warm, retro aesthetic with good contrast.
    ];
  };
}

{ config, pkgs, ... }:

let
  # Reference to the home configuration from NixOS
  home = config.home;
in
{
  # Sets environment variables for the user's login session
  home.sessionVariables = {
    # Set the default text editor to Neovim
    EDITOR = "nvim";

    # Set the visual editor (used by some applications) to Neovim
    VISUAL = "nvim";

    # Set the default language for the environment to US English
    LANG = "en_US.UTF-8";

    # Set the default web browser to Firefox
    BROWSER = "firefox";

    # Set the default terminal to Alacritty
    TERMINAL = "alacritty";
  };

  # Configuration for Zsh will be imported from an external file `zsh.nix`
}