{ config, lib, pkgs, ... }:
let
  cfg = config.profiles.communication;

  poorObfuscation = y: x: "${x}@${y}";
  mapKeys = map (x:
    let
      x' = lib.splitString " " x;
    in
    {
      map = lib.splitString "," (lib.head x');
      key = lib.elemAt x' 1;
      action = lib.last x';
    });
  mbsyncCmd = if pkgs.stdenv.isLinux then "${config.programs.mbsync.package}/bin/mbsync" else "";
in
{
  imports = [ ../../modules/programs/nixpkgs ];

  options.profiles.communication = {
    enable = lib.mkEnableOption
      "A profile that enables the system to communicate via internet.";
  };

  config = lib.mkIf cfg.enable (lib.mkMerge [
    (lib.mkIf pkgs.stdenv.isLinux { # TODO: is this needed?
      accounts.email = {
        maildirBasePath = "${config.home.homeDirectory}/mail";

        accounts.sef = {
          address = poorObfuscation "sefidel.com" "contact";
          # gpg = {
          #   key = "";
          #   signByDefault = true;
          # };

          imap.host = "mail.exotic.sh";
          imap.tls.enable = true;
          smtp.host = "mail.exotic.sh";
          smtp.tls.enable = true;

          mbsync = {
            enable = true;
            create = "maildir";
            remove = "none";
            expunge = "both";

            extraConfig.account.SSLType = "IMAPS";
            extraConfig.account.SSLVersions = "TLSv1.2";
          };

          msmtp.enable = true;
          notmuch.enable = true;
          neomutt.enable = true;
          neomutt.mailboxName = "sef";
          neomutt.extraMailboxes = [
            "Archive"
            "Drafts"
            "Junk"
            "Sent"
            "Trash"
          ];

          imapnotify = {
            enable = true;
            boxes = [ "Inbox" ];
            onNotify = pkgs.writeShellScript "imap-on-notify" ''
              ${mbsyncCmd} sef
              ${pkgs.notmuch}/bin/notmuch new
            '';
          };

          primary = true;
          realName = "***REMOVED***";
          userName = poorObfuscation "sefidel.com" "contact";
          passwordCommand = "${pkgs.passage}/bin/passage show email/sef";
        };
      };

      programs.abook.enable = true;
      programs.mbsync.enable = true;
      programs.msmtp.enable = true;
      programs.notmuch = {
        enable = true;
        hooks.preNew = "${mbsyncCmd} --all";
      };

      programs.neomutt = {
        enable = true;
        sidebar.enable = true;
        sidebar.format = "%D%?F? [%F]?%* %?N?*N/?%S";

        sort = "reverse-threads";

        settings = {
          date_format = ''"%y/%m/%d %I:%M%p"'';
          index_format = ''"%4C %Z %?X?A& ? %D %-15.15L (%-4.4c) %s"'';
          query_command = ''"abook --mutt-query '%s'"'';
          rfc2047_parameters = "yes";
          # Pause 0 seconds for informational messages
          sleep_time = "0";
          # Disables the `+` displayed at line wraps
          markers = "no";
          # Unread mail stay unread until read;
          mark_old = "no";
          # attachments are forwarded with mail;
          mime_forward = "yes";
          # mutt won't ask "press key to continue";
          wait_key = "no";
          # skip to compose when replying
          fast_reply = "yes";
          # save attachments with the body
          fcc_attach = "yes";
          # format of subject when forwarding;
          forward_format = ''"Fwd: %s"'';
          # include message in forwards
          forward_quote = "yes";
          # reply as whomever it was to
          reverse_name = "yes";
          # include message in replies
          include = "yes";

          # edit headers in editor
          autoedit = "yes";
          edit_headers = "yes";
        };

        binds = mapKeys [
          "index,pager i noop"
          "index,pager g noop"
          "index \\Cf noop"
          "index j next-entry"
          "index k previous-entry"
          "attach <return> view-mailcap"
          "attach l view-mailcap"
          "editor <space> noop"
          "index G last-entry"
          "index gg first-entry"
          "pager,attach h exit"
          "pager j next-line"
          "pager k previous-line"
          "pager l view-attachments"
          "index D delete-message"
          "index U undelete-message"
          "index L limit"
          "index h noop"
          "index l display-message"
          "index,query <space> tag-entry"
          "browser h goto-parent"
          "index,pager H view-raw-message"
          "browser l select-entry"
          "pager,browser gg top-page"
          "pager,browser G bottom-page"
          "index,pager,browser d half-down"
          "index,pager,browser u half-up"
          "index,pager S sync-mailbox"
          "index,pager R group-reply"
          "index \\031 previous-undeleted" # Mouse wheel
          "index \\005 next-undeleted" # Mouse wheel
          "pager \\031 previous-line" # Mouse wheel
          "pager \\005 next-line" # Mouse wheel
          "editor <Tab> complete-query"

          # Pager stuff
          "index,pager B sidebar-toggle-visible"
        ];
        macros = mapKeys [
          "index,pager \\Ck <sidebar-prev><sidebar-open>"
          "index,pager \\Cj <sidebar-next><sidebar-open>"
          "index,pager \\Cp <sidebar-prev-new><sidebar-open>"
          "index,pager \\Cn <sidebar-next-new><sidebar-open>"
          "index,pager \\Cb <pipe-message>urlscan<Enter>"
          "attach,compose \\Cb <pipe-entry>urlscan<Enter>"
        ];

        # TODO: Re-theme this after nightlamp -> limestone theme
        extraConfig = ''
          # Default index colors:
          color index yellow default '.*'
          color index_author red default '.*'
          color index_number blue default
          color index_subject cyan default '.*'

          # New mail is boldened:
          color index brightyellow black "~N"
          color index_author brightred black "~N"
          color index_subject brightcyan black "~N"


          # Tagged mail is highlighted:
          color index brightyellow blue "~T"
          color index_author brightred blue "~T"
          color index_subject brightcyan blue "~T"


          # Other colors and aesthetic settings:
          mono bold bold
          mono underline underline
          mono indicator reverse
          mono error bold
          color normal default default
          color indicator brightblack white
          color sidebar_highlight red default
          color sidebar_divider brightblack black
          color sidebar_flagged red black
          color sidebar_new green black
          color normal brightyellow default
          color error red default
          color tilde black default
          color message cyan default
          color markers red white
          color attachment white default
          color search brightmagenta default
          color status brightyellow black
          color hdrdefault brightgreen default
          color quoted green default
          color quoted1 blue default
          color quoted2 cyan default
          color quoted3 yellow default
          color quoted4 red default
          color quoted5 brightred default
          color signature brightgreen default
          color bold black default
          color underline black default
          color normal default default


          # Regex highlighting:
          color header blue default ".*"
          color header brightmagenta default "^(From)"
          color header brightcyan default "^(Subject)"
          color header brightwhite default "^(CC|BCC)"
          color body brightred default "[\-\.+_a-zA-Z0-9]+@[\-\.a-zA-Z0-9]+" # Email addresses
          color body brightblue default "(https?|ftp)://[\-\.,/%~_:?&=\#a-zA-Z0-9]+" # URL
          color body green default "\`[^\`]*\`" # Green text between ` and `
          color body brightblue default "^# \.*" # Headings as bold blue
          color body brightcyan default "^## \.*" # Subheadings as bold cyan
          color body brightgreen default "^### \.*" # Subsubheadings as bold green
          color body yellow default "^(\t| )*(-|\\*) \.*" # List items as yellow
          color body brightcyan default "[;:][-o][)/(|]" # emoticons
          color body brightcyan default "[;:][)(|]" # emoticons
          color body brightcyan default "[ ][*][^*]*[*][ ]?" # more emoticon?
          color body brightcyan default "[ ]?[*][^*]*[*][ ]" # more emoticon?
          color body red default "(BAD signature)"
          color body cyan default "(Good signature)"
          color body brightblack default "^gpg: Good signature .*"
          color body brightyellow default "^gpg: "
          color body brightyellow red "^gpg: BAD signature from.*"
          mono body bold "^gpg: Good signature"
          mono body bold "^gpg: BAD signature from.*"
          color body red default "([a-z][a-z0-9+-]*://(((([a-z0-9_.!~*'();:&=+$,-]|%[0-9a-f][0-9a-f])*@)?((([a-z0-9]([a-z0-9-]*[a-z0-9])?)\\.)*([a-z]([a-z0-9-]*[a-z0-9])?)\\.?|[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+)(:[0-9]+)?)|([a-z0-9_.!~*'()$,;:@&=+-]|%[0-9a-f][0-9a-f])+)(/([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*(;([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*)*(/([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*(;([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*)*)*)?(\\?([a-z0-9_.!~*'();/?:@&=+$,-]|%[0-9a-f][0-9a-f])*)?(#([a-z0-9_.!~*'();/?:@&=+$,-]|%[0-9a-f][0-9a-f])*)?|(www|ftp)\\.(([a-z0-9]([a-z0-9-]*[a-z0-9])?)\\.)*([a-z]([a-z0-9-]*[a-z0-9])?)\\.?(:[0-9]+)?(/([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*(;([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*)*(/([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*(;([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*)*)*)?(\\?([-a-z0-9_.!~*'();/?:@&=+$,]|%[0-9a-f][0-9a-f])*)?(#([-a-z0-9_.!~*'();/?:@&=+$,]|%[0-9a-f][0-9a-f])*)?)[^].,:;!)? \t\r\n<>\"]"
        '';
      };

      programs.notmuch.hooks.postNew = ''
        ${pkgs.libnotify}/bin/notify-send --icon=mail-unread --app-name=notmuch \
          "Email" "Sync completed"
      '';

      services.imapnotify.enable = true;

      # Sync emails on initial login
      systemd.user.services.mbsync-oneshot = {
        Unit = {
          Description = "mbsync oneshot synchronisation";
        };
        Service = {
          Type = "oneshot";
          ExecStart = "${mbsyncCmd} --all";
          RemainAfterExit = true;
          TimeoutStartSec = "5min";
        };
        Install.WantedBy = [ "default.target" ];
      };

      home.file.".mailcap".text =
        let
          setsid = "${pkgs.util-linux}/bin/setsid";
          openfile = "${pkgs.writeShellScript "openfile" ''
        # Helps open a file with xdg-open from mutt in a external program without weird side effects.
        tempdir="''${TMPDIR:-$(mktemp -d)}"
        file="$tempdir/$(basename "$1")"
        [ "$(uname)" = "Darwin" ] && opener="open" || opener="${setsid} -f ${pkgs.xdg-utils}/bin/xdg-open"
        mkdir -p "$tempdir"
        cp -f "$1" "$file"
        $opener "$file" >/dev/null 2>&1
        find "''${tempdir:?}" -mtime +1 -type f -delete
      ''}";
        in
        ''
          ${lib.optionalString false "text/html; ${pkgs.w3m}/bin/w3m -dump -T text/html -I %{charset} -O utf-8 %s; copiousoutut; description=HTML Text; nametemplate=%s.html"}
          text/plain; $EDITOR %s ;
          ${lib.optionalString true "text/html; ${openfile} %s ; nametemplate=%s.html"}
          text/html; ${pkgs.lynx}/bin/lynx -assume_charset=%{charset} -display_charset=utf-8 -dump %s; nametemplate=%s.html; copiousoutput;
          image/*; ${openfile} %s ;
          application/pdf; ${openfile} %s ;
          # application/pgp-encrypted; gpg -d '%s'; copiousoutput;
        '';
    })
    {
      home.packages = with pkgs; [
        urlscan
        ispell

        # nheko # TODO: https://nixpk.gs/pr-tracker.html?pr=216454
        element-desktop
        (weechat.override {
          configure = { availablePlugins, ... }: {
            plugins = [
              (availablePlugins.python.withPackages (ps: with ps; [
                potr
                pycrypto
                (if pkgs.stdenv.isDarwin then pync else [ ])
              ]))
              availablePlugins.perl
              availablePlugins.lua
            ];
          };
        })
      ];
    }
  ]);
}