dotfiles/modules/common/mail/default.nix

{ config, pkgs, lib, ... }: {

  imports = [ ./himalaya.nix ./aerc.nix ./system.nix ];

  options = {
    mail.enable = lib.mkEnableOption "Mail service.";
    mail.user = lib.mkOption {
      type = lib.types.str;
      description = "User name for the email address.";
      default = config.user;
    };
    mail.server = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      description = "Server name for the email address.";
    };
    mail.imapHost = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      description = "Server host for IMAP (reading mail).";
    };
    mail.smtpHost = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      description = "Server host for SMTP (sending mail).";
    };
  };

  config = lib.mkIf config.mail.enable {

    home-manager.users.${config.user} = {
      programs.mbsync = { enable = true; };

      # Automatically check for mail and keep files synced locally
      services.mbsync = lib.mkIf pkgs.stdenv.isLinux {
        enable = true;
        frequency = "*:0/5";
        postExec = "${pkgs.notmuch}/bin/notmuch new";
      };

      # Used to watch for new mail and trigger sync
      services.imapnotify.enable = pkgs.stdenv.isLinux;

      # Allows sending email from CLI/sendmail
      programs.msmtp.enable = true;

      # Better local mail search
      programs.notmuch = {
        enable = true;
        new.ignore = [ ".mbsyncstate.lock" ".mbsyncstate.journal" ];
      };

      accounts.email = {

        # Where email files are stored
        maildirBasePath = "${config.homePath}/mail";

        accounts = {
          home = let address = "${config.mail.user}@${config.mail.server}";
          in {
            userName = address;
            realName = config.fullName;
            primary = true;
            inherit address;
            aliases = map (user: "${user}@${config.mail.server}") [
              "me"
              "hey"
              "admin"
            ];

            # Options for contact completion
            alot = { };

            imap = {
              host = config.mail.imapHost;
              port = 993;
              tls.enable = true;
            };

            # Watch for mail and run notifications or sync
            imapnotify = {
              enable = true;
              boxes = [ "Inbox" ];
              onNotify = "${pkgs.isync}/bin/mbsync -a";
              onNotifyPost = lib.mkIf
                config.home-manager.users.${config.user}.services.dunst.enable
                "${pkgs.libnotify}/bin/notify-send 'New mail arrived'";
            };

            # Name of the directory in maildir for this account
            maildir = { path = "main"; };

            # Bi-directional syncing options for local files
            mbsync = {
              enable = true;
              create = "both";
              expunge = "both";
              remove = "both";
              patterns = [ "*" ];
              extraConfig.channel = {
                CopyArrivalDate = "yes"; # Sync time of original message
              };
            };

            # Enable indexing
            notmuch.enable = true;

            # Used to login and send and receive emails
            passwordCommand =
              "${pkgs.age}/bin/age --decrypt --identity ~/.ssh/id_ed25519 ${
                pkgs.writeText "mailpass.age"
                (builtins.readFile ../../../private/mailpass.age)
              }";

            smtp = {
              host = config.mail.smtpHost;
              port = 465;
              tls.enable = true;
            };
          };
        };
      };

    };

  };
}