# look at dev/get_keys.py to generate a default mappings
{ config, lib, pkgs, ... }:

with lib;

let
  cfg = config.programs.astroid;

  astroidAccounts = filterAttrs (n: v: v.notmuch.enable)
    (config.accounts.email.accounts);

  sendMailCommand = account:
    if account.astroid.sendMailCommand != null then account.astroid.sendMailCommand
    else
    if account.msmtp.enable then cfg.msmtp.sendCommand else "";

  accountAttr = account: with account; {
      email = address;
      name = realName;
      sendmail = sendMailCommand account;
      additional_sent_tags = "";
      default = if primary then "true" else "false";
      save_drafts_to = folders.drafts;
      save_sent = "true";
      save_sent_to = folders.sent;
      select_query = "";
    }
    // optionalAttrs (signature.showSignature != "none") {
      signature_attach= if (signature.showSignature == "attach") then "true" else "false";
      signature_default_on = if (signature.showSignature != "none") then "true" else "false";
      signature_file = pkgs.writeText "signature.txt" signature.text;
      signature_file_markdown = "false";
      signature_separate = "true";  # prepends '--\n' to the signature
    }
    // optionalAttrs (gpg != null) {
      always_gpg_sign = if gpg.signByDefault then "true" else "false";
      gpgkey = gpg.key;
    }
    // astroid.extraConfig
    ;

  # See https://github.com/astroidmail/astroid/wiki/Configuration-Reference
  configFile = mailAccounts: let
    template = builtins.fromJSON (builtins.readFile ./astroid-config-template.json);
    astroidConfig =
        recursiveUpdate (template // {
          astroid.notmuch_config = "${config.xdg.configHome}/notmuch/notmuchrc";
          accounts = mapAttrs (name: account: (accountAttr account) )  astroidAccounts;
          crypto.gpg.path = "${pkgs.gnupg}/bin/gpg";
        }
        // cfg.extraConfig
        )
        cfg.externalEditor;
    in
      builtins.toJSON astroidConfig;


in
{

  options = {
    programs.astroid = {
      enable = mkEnableOption "Astroid";

      pollScript = mkOption {
        type = types.str;
        default = "";
        example = ''
          mbsync gmail
        '';
        description = ''
          Script to run to fetch/update mails.
        '';
      };

      externalEditor = mkOption {
        type = types.str;
        default = ''
          gvim -c 'set ft=mail' '+set fileencoding=utf-8' '+set ff=unix' '+set enc=utf-8' '+set fo+=w' %1
        '';
        # converts it into json that can be appended to the config
        apply = cmd:
          {
            editor = {
              "external_editor" = "true";
              "cmd" = cmd;
            };
          };

        example = ''
          nvim-qt -- -c 'set ft=mail' '+set fileencoding=utf-8' '+set ff=unix' '+set enc=utf-8' '+set fo+=w' %1
        '';
        description = ''
          You can use %1 / %2 / %3 to refer respectively to:
          - filename
          - servername
          - socketid
          See <link xlink:href='https://github.com/astroidmail/astroid/wiki/Customizing-editor' />
        '';
      };

      extraConfig = mkOption {
        type = types.attrs;
        default = {};
        example = literalExample ''
          {
            poll.interval = 0;
          }
        '';
        description = ''
          JSON config that will override the default astroid configuration.
        '';
      };
    };
  };

  config = mkIf cfg.enable {

    home.packages =  [ pkgs.astroid ];

    xdg.configFile."astroid/config".source = pkgs.runCommandNoCC "out.json"
    {x = configFile astroidAccounts; } ''echo "$x" | ${pkgs.jq}/bin/jq . > $out'';

    xdg.configFile."astroid/poll.sh" = {
      executable = true;
      text = "# Generated by home-manager\n" + cfg.pollScript;
    };
  };
}