# Version control: git + delta pager + commitizen. The work host layers
# commit signing and an email override on top (see work/default.nix).
{
  pkgs,
  lib,
  fullName,
  ...
}:
{
  home.packages = [
    pkgs.commitizen
  ];

  programs.git = {
    enable = true;
    package = pkgs.gitFull;
    settings = {
      user.name = fullName;
      # Personal identity. mkDefault so the work module overrides it on the work
      # host (and to merge cleanly with that plain definition there).
      user.email = lib.mkDefault "iam@emmathe.dev";
      push.autoSetupRemote = true;
      init.defaultBranch = "main";

      # Rebase-centric pulls (matches the "always a branch, linear history"
      # workflow); stash/restore and reorder fixups automatically.
      pull.rebase = true;
      rebase = {
        autoStash = true;
        autoSquash = true;
      };

      fetch.prune = true; # drop deleted remote-tracking branches
      merge.conflictStyle = "zdiff3"; # show the common ancestor in conflicts
      diff = {
        algorithm = "histogram";
        colorMoved = "default";
      };
      rerere.enabled = true; # remember + replay conflict resolutions
      commit.verbose = true; # full diff in the commit-message editor
      branch.sort = "-committerdate"; # most-recent branches first
      column.ui = "auto";
      help.autocorrect = "prompt";

      alias = {
        st = "status";
        co = "checkout";
        sw = "switch";
        br = "branch";
        ci = "commit";
        last = "log -1 HEAD";
        unstage = "reset HEAD --";
        lg = "log --graph --abbrev-commit --decorate --format=format:'%C(bold blue)%h%C(reset) %C(bold green)(%ar)%C(reset) %C(white)%s%C(reset) %C(dim white)- %an%C(reset)%C(auto)%d%C(reset)' --all";
        # commitizen (Conventional Commits, its default ruleset): `git cz c` ->
        # `cz commit`, `git cz bump`, etc. `git cc` is a shortcut for the prompt.
        cz = "!cz";
        cc = "!cz commit";
      };

      # SSH commit signing on personal hosts too (the work module sets the same
      # on the work host). mkDefault so a host without the key in its ssh-agent
      # can override to false -- otherwise commits there would fail. Reuses the
      # existing ssh key; a dedicated personal key can be swapped in later.
      gpg.format = "ssh";
      user.signingkey = "key::ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAJMVgeRKnfX1G8coU3nAobI485aeUpGTMqH7+zbKI8o emma.thorpe@cloud.com";
      commit.gpgsign = lib.mkDefault true;
      tag.gpgsign = lib.mkDefault true;
    };

    # Global ignore file (~/.config/git/ignore).
    ignores = [
      "result"
      "result-*"
      ".direnv"
      "*.swp"
      ".DS_Store"
    ];
  };

  programs.delta = {
    enable = true;
    enableGitIntegration = true;
  };
}