{ lib, ... }:

with lib;

let

  extraConfigType = with lib.types; attrsOf (either (either str int) bool);

in {
  options.mbsync = {
    enable = mkEnableOption "synchronization using mbsync";

    flatten = mkOption {
      type = types.nullOr types.str;
      default = null;
      example = ".";
      description = ''
        If set, flattens the hierarchy within the maildir by
        substituting the canonical hierarchy delimiter
        <literal>/</literal> with this value.
      '';
    };

    create = mkOption {
      type = types.enum [ "none" "maildir" "imap" "both" ];
      default = "none";
      example = "maildir";
      description = ''
        Automatically create missing mailboxes within the
        given mail store.
      '';
    };

    remove = mkOption {
      type = types.enum [ "none" "maildir" "imap" "both" ];
      default = "none";
      example = "imap";
      description = ''
        Propagate mailbox deletions to the given mail store.
      '';
    };

    expunge = mkOption {
      type = types.enum [ "none" "maildir" "imap" "both" ];
      default = "none";
      example = "both";
      description = ''
        Permanently remove messages marked for deletion from
        the given mail store.
      '';
    };

    patterns = mkOption {
      type = types.listOf types.str;
      default = [ "*" ];
      description = ''
        Pattern of mailboxes to synchronize.
      '';
    };

    extraConfig.channel = mkOption {
      type = extraConfigType;
      default = { };
      example = literalExample ''
        {
          MaxMessages = 10000;
          MaxSize = "1m";
        };
      '';
      description = ''
        Per channel extra configuration.
      '';
    };

    extraConfig.local = mkOption {
      type = extraConfigType;
      default = { };
      description = ''
        Local store extra configuration.
      '';
    };

    extraConfig.remote = mkOption {
      type = extraConfigType;
      default = { };
      description = ''
        Remote store extra configuration.
      '';
    };

    extraConfig.account = mkOption {
      type = extraConfigType;
      default = { };
      example = literalExample ''
        {
          PipelineDepth = 10;
          Timeout = 60;
        };
      '';
      description = ''
        Account section extra configuration.
      '';
    };
  };
}