{ stdenv, fetchurl, fetchFromGitHub, buildGoModule, buildEnv, lib, sources }:

let
  version = "8.1.6";

  mattermost-server = buildGoModule rec {
    pname = "mattermost-server";
    inherit version;

    src = "${sources.mattermost-server}/server";

    vendorHash = "sha256-25nyneJ+ynM9WdnnLd4L3a720ecKdhJ1vyRG5lx2mgY=";

    subPackages = [ "cmd/mattermost" ];

    ldflags = [
      "-s"
      "-w"
      "-X github.com/mattermost/mattermost/server/public/model.Version=${version}"
      "-X github.com/mattermost/mattermost/server/public/model.BuildNumber=${version}-haccfiles"
      "-X github.com/mattermost/mattermost/server/public/model.BuildDate=1970-01-01"
      "-X github.com/mattermost/mattermost/server/public/model.BuildHash=v${version}"
      "-X github.com/mattermost/mattermost/server/public/model.BuildHashEnterprise=v${version}"
      "-X github.com/mattermost/mattermost/server/public/model.BuildEnterpriseReady=false"
    ];
  };

  mattermost-webapp = stdenv.mkDerivation {
    pname = "mattermost-webapp";
    inherit version;

    src = sources.mattermost-webapp;

    installPhase = ''
      mkdir -p $out
      cp -r client $out
      cp -r i18n $out
      cp -r fonts $out
      cp -r templates $out
      cp -r config $out
    '';
  };

in
  buildEnv {
    name = "mattermost-${version}";
    paths = [ mattermost-server mattermost-webapp ];

    meta = with lib; {
      description = "Open-source, self-hosted Slack-alternative";
      homepage = "https://www.mattermost.org";
      license = with licenses; [ agpl3 asl20 ];
      maintainers = with maintainers; [ fpletz ryantm ];
      platforms = platforms.unix;
    };
  }