nativeBuildInputs = with pkgs.buildPackages; [ erlang_25 rebar3 libsodium sqlite] ++ [erlang-ls];

  nativeBuildInputs = with pkgs.buildPackages; [ erlang_26 rebar3 libsodium sqlite] ++ [erlang-ls];

{
  description = "Repro flake";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  outputs = {
    self,
    nixpkgs,
    flake-utils,
  }:
    flake-utils.lib.eachDefaultSystem
    (
      system: let
        pkgs = nixpkgs.legacyPackages.${system};
      in {
        devShells.default = import ./shell.nix {inherit pkgs;};
      }
    );
}

{
  "nodes": {
    "flake-utils": {
      "inputs": {
        "systems": "systems"
      },
      "locked": {
        "lastModified": 1701680307,
        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
        "owner": "numtide",
        "repo": "flake-utils",
        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
        "type": "github"
      },
      "original": {
        "owner": "numtide",
        "repo": "flake-utils",
        "type": "github"
      }
    },
    "nixpkgs": {
      "locked": {
        "lastModified": 1703499205,
        "narHash": "sha256-lF9rK5mSUfIZJgZxC3ge40tp1gmyyOXZ+lRY3P8bfbg=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "e1fa12d4f6c6fe19ccb59cac54b5b3f25e160870",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "flake-utils": "flake-utils",
        "nixpkgs": "nixpkgs"
      }
    },
    "systems": {
      "locked": {
        "lastModified": 1681028828,
        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
        "owner": "nix-systems",
        "repo": "default",
        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
        "type": "github"
      },
      "original": {
        "owner": "nix-systems",
        "repo": "default",
        "type": "github"
      }
    }
  },
  "root": "root",
  "version": 7
}

decode_post_header(Data) ->
    << PubKey:32/binary, Signature:64/binary, SignedData/binary>> = Data,
    true = enacl:sign_verify_detached(Signature, SignedData, PubKey),
    {NumLinks, Rest} = wire:decode_varint(SignedData),
    <<LinkData:(32*NumLinks)/binary, Rest2/binary>> = Rest,
    Links = [Link || <<Link:32/binary>> <= LinkData],
    case length(Links) =:= NumLinks of
        false ->
            ErrMsg = io_lib:format("invalid num_links - expected ~p but got ~p", [NumLinks, length(Links)]),
            erlang:error(lists:flatten(ErrMsg));
        true ->
            [PostType, Timestamp, PostBody] = wire:decode_varints(Rest2, 2),
            PostHash = enacl:generichash(32, Data),
            [
             [ {public_key, PubKey}
             , {links, Links}
             , {type, PostType}
             , {timestamp, Timestamp}
             , {hash, PostHash}
             ]
            , PostBody]
    end.

decode_post_header(Data) ->
    << PubKey:32/binary, Signature:64/binary, SignedData/binary>> = Data,
    true = enacl:sign_verify_detached(Signature, SignedData, PubKey),
    {NumLinks, Rest} = wire:decode_varint(SignedData),
    <<LinkData:(32*NumLinks)/binary, Rest2/binary>> = Rest,
    Links = [Link || <<Link:32/binary>> <= LinkData],
    case length(Links) =:= NumLinks of
        false ->
            ErrMsg = io_lib:format("invalid num_links - expected ~p but got ~p", [NumLinks, length(Links)]),
            erlang:error(lists:flatten(ErrMsg));
        true ->
            [PostType, Timestamp, PostBody] = wire:decode_varints(Rest2, 2),
            PostHash = enacl:generichash(32, Data),
            [
             [ {public_key, PubKey}
             , {links, Links}
             , {type, PostType}
             , {timestamp, Timestamp}
             , {hash, PostHash}
             ]
            , PostBody]
    end.

                false -> % already joined

                false -> % not even joined