{ lib
, stdenv
, buildPythonPackage
, pythonOlder
, fetchFromGitHub
, opencv4
, torch
, onnx
, onnxruntime
, pillow
, pywavelets
, numpy
, callPackage
, withOnnx ? false # Enables the rivaGan en- and decoding method
}:

buildPythonPackage rec {
  pname = "invisible-watermark";
  version = "0.2.0";
  format = "setuptools";
  disabled = pythonOlder "3.6";

  src = fetchFromGitHub {
    owner = "ShieldMnt";
    repo = "invisible-watermark";
    rev = "e58e451cff7e092457cd915e445b1a20b64a7c8f"; # No git tag, see https://github.com/ShieldMnt/invisible-watermark/issues/22
    hash = "sha256-6SjVpKFtiiLLU7tZ3hBQr0KT/YEQyywJj0e21/dJRzk=";
  };

  propagatedBuildInputs = [
    opencv4
    torch
    pillow
    pywavelets
    numpy
  ] ++ lib.optionals withOnnx [
    onnx
    onnxruntime
  ];

  postPatch = ''
    substituteInPlace setup.py \
      --replace 'opencv-python>=4.1.0.25' 'opencv'
    substituteInPlace imwatermark/rivaGan.py --replace \
      'You can install it with pip: `pip install onnxruntime`.' \
      'You can install it with an override: `python3Packages.invisible-watermark.override { withOnnx = true; };`.'
  '';

  passthru.tests = let
    image = "${src}/test_vectors/original.jpg";
    methods = [ "dwtDct" "dwtDctSvd" "rivaGan" ];
    testCases = builtins.concatMap (method: [
      { method = method; withOnnx = true; }
      { method = method; withOnnx = false; }
    ]) methods;
    createTest = { method, withOnnx }: let
      testName = "${if withOnnx then "withOnnx" else "withoutOnnx"}-${method}";
    # This test fails in the sandbox on aarch64-linux, see https://github.com/microsoft/onnxruntime/issues/10038
    skipTest = stdenv.isLinux && stdenv.isAarch64 && withOnnx && method == "rivaGan";
    in lib.optionalAttrs (!skipTest) {
      "${testName}" = callPackage ./tests/cli.nix { inherit image method testName withOnnx; };
    };
    allTests = builtins.map createTest testCases;
  in (lib.attrsets.mergeAttrsList allTests) // {
    python = callPackage ./tests/python { inherit image; };
  };

  pythonImportsCheck = [ "imwatermark" ];

  meta = with lib; {
    description = "A library for creating and decoding invisible image watermarks";
    mainProgram = "invisible-watermark";
    homepage = "https://github.com/ShieldMnt/invisible-watermark";
    license = licenses.mit;
    maintainers = with maintainers; [ Luflosi ];
  };
}