package.nix

{
  lib,
  stdenv,
  buildGoModule,
  fetchFromGitHub,
  installShellFiles,

  enableWasmEval ? false,
}:

assert
  enableWasmEval && stdenv.hostPlatform.isDarwin
  -> throw "building with wasm on darwin is failing in nixpkgs";

buildGoModule (finalAttrs: {
  pname = "open-policy-agent";
  version = "1.16.2";

  src = fetchFromGitHub {
    owner = "open-policy-agent";
    repo = "opa";
    tag = "v${finalAttrs.version}";
    hash = "sha256-f9t/BB0ldSUTaApjM75W9nw7jRC8Hp1t/KFRM/ky67s=";
  };

  vendorHash = "sha256-m+Mb2Llny7O9cfn8Js7MEaeYM9zC/CwWBAuliWE7G1E=";

  nativeBuildInputs = [ installShellFiles ];

  subPackages = [ "." ];

  ldflags = [
    "-s"
    "-X github.com/open-policy-agent/opa/version.Version=${finalAttrs.version}"
  ];

  tags = lib.optional enableWasmEval (
    builtins.trace (
      "Warning: enableWasmEval breaks reproducability, "
      + "ensure you need wasm evaluation. "
      + "`opa build` does not need this feature."
    ) "opa_wasm"
  );

  checkFlags =
    let
      skippedTests = [
        # Skip tests that require network, not available in the nix sandbox
        "TestInterQueryCache_ClientError"
        "TestIntraQueryCache_ClientError"
        "TestSSOCredentialService"

        # This test depends on the metrics available in go not changing. This is a bit
        # too unstable for us updating go independently.
        "TestJSONSerialization"

        # Flaky
        "TestGraphQLParseSchemaAlloc"
      ]
      ++ lib.optionals stdenv.hostPlatform.isDarwin [
        # Skip tests that require network, not available in the darwin sandbox
        "TestHTTPSClient"
        "TestHTTPSNoClientCerts"
        "TestSocketHTTPGetRequest"

        # Flaky
        "TestBenchMainWithBundleRegoVersion"
        "TestClientTLSWithCustomCACert"
        "TestECR"
        "TestManagerWithOPATelemetryUpdateLoop"
      ]
      ++ lib.optionals (!enableWasmEval) [
        "TestRegoTargetWasmAndTargetPluginDisablesIndexingTopdownStages"
      ];
    in
    [ "-skip=^${builtins.concatStringsSep "$|^" skippedTests}$" ];

  preCheck =
    # Feed in all but the e2e tests for testing
    # This is because subPackages above limits what is built to just what we
    # want but also limits the tests
    # Also avoid wasm tests on darwin due to wasmtime-go build issues
    ''
      getGoDirs() {
        go list ./... | grep -v -e e2e ${lib.optionalString stdenv.hostPlatform.isDarwin "-e wasm"}
      }
    ''
    # remove tests that have "too many open files"/"no space left on device" issues on darwin in hydra
    + lib.optionalString stdenv.hostPlatform.isDarwin ''
      rm v1/server/server_test.go
      rm v1/server/server_bench_test.go
    '';

  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
    installShellCompletion --cmd opa \
      --bash <($out/bin/opa completion bash) \
      --fish <($out/bin/opa completion fish) \
      --zsh <($out/bin/opa completion zsh)
  '';

  doInstallCheck = true;
  installCheckPhase = ''
    runHook preInstallCheck

    $out/bin/opa --help
    $out/bin/opa version | grep "Version: ${finalAttrs.version}"

    ${lib.optionalString enableWasmEval ''
      # If wasm is enabled verify it works
      $out/bin/opa eval -t wasm 'trace("hello from wasm")'
    ''}

    runHook postInstallCheck
  '';

  # Required for tests that need networking
  __darwinAllowLocalNetworking = true;

  meta = {
    mainProgram = "opa";
    homepage = "https://www.openpolicyagent.org";
    changelog = "https://github.com/open-policy-agent/opa/blob/v${finalAttrs.version}/CHANGELOG.md";
    description = "General-purpose policy engine";
    longDescription = ''
      The Open Policy Agent (OPA, pronounced "oh-pa") is an open source, general-purpose policy engine that unifies
      policy enforcement across the stack. OPA provides a high-level declarative language that let’s you specify policy
      as code and simple APIs to offload policy decision-making from your software. You can use OPA to enforce policies
      in microservices, Kubernetes, CI/CD pipelines, API gateways, and more.
    '';
    license = lib.licenses.asl20;
    maintainers = with lib.maintainers; [
      lewo
      jk
    ];
  };
})