/*
Copyright 2024 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package testing

import (
	"context"
	"testing"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/validation/field"
)

type VersionValidationRunner func(t *testing.T, gv string, versionValidationErrors field.ErrorList)

// RunValidationForEachVersion runs f as a subtest of t for each version of the given unversioned object.
// Each subtest is named by GroupVersionKind.  Each call to f is provided the field.ErrorList results
// of converting the unversioned object to a version and validating it.
//
// Only autogenerated validation is run. To test both handwritten and autogenerated validation:
//
//		RunValidationForEachVersion(t, testCase.pod, func(t *testing.T, versionValidationErrors field.ErrorList) {
//		  errs := ValidatePod(testCase.obj) // hand written validation
//	      errs = append(errs, versionValidationErrors...) // generated declarative validation
//		  // Validate that the errors are what was expected for this test case.
//		})
func RunValidationForEachVersion(t *testing.T, scheme *runtime.Scheme, options []string, unversioned runtime.Object, fn VersionValidationRunner, ignoreConversionErrors bool, subresources ...string) {
	runValidation(t, scheme, options, unversioned, fn, ignoreConversionErrors, subresources...)
}

// RunUpdateValidationForEachVersion is like RunValidationForEachVersion but for update validation.
func RunUpdateValidationForEachVersion(t *testing.T, scheme *runtime.Scheme, options []string, unversioned, unversionedOld runtime.Object, fn VersionValidationRunner, ignoreConversionErrors bool, subresources ...string) {
	runUpdateValidation(t, scheme, options, unversioned, unversionedOld, fn, ignoreConversionErrors, subresources...)
}

func runValidation(t *testing.T, scheme *runtime.Scheme, options []string, unversioned runtime.Object, fn VersionValidationRunner, ignoreConversionErrors bool, subresources ...string) {
	unversionedGVKs, _, err := scheme.ObjectKinds(unversioned)
	if err != nil {
		t.Fatal(err)
	}
	for _, unversionedGVK := range unversionedGVKs {
		// skip if passed in unversioned object is not internal.
		if unversionedGVK.Version != runtime.APIVersionInternal {
			continue
		}
		gvs := scheme.VersionsForGroupKind(unversionedGVK.GroupKind())
		for _, gv := range gvs {
			gvk := gv.WithKind(unversionedGVK.Kind)
			t.Run(gvk.String(), func(t *testing.T) {
				if gvk.Version != runtime.APIVersionInternal { // skip internal
					versioned, err := scheme.New(gvk)
					if err != nil {
						t.Fatal(err)
					}
					err = scheme.Convert(unversioned, versioned, nil)
					if ignoreConversionErrors && err != nil {
						t.Skipf("Failed to convert object from internal type to %s: %v", gvk.Version, err)
					} else if err != nil {
						t.Fatal(err)
					}
					fn(t, gv.String(), scheme.Validate(context.Background(), options, versioned, subresources...))
				}
			})
		}
	}
}

func runUpdateValidation(t *testing.T, scheme *runtime.Scheme, options []string, unversionedNew, unversionedOld runtime.Object, fn VersionValidationRunner, ignoreConversionErrors bool, subresources ...string) {
	unversionedGVKs, _, err := scheme.ObjectKinds(unversionedNew)
	if err != nil {
		t.Fatal(err)
	}
	for _, unversionedGVK := range unversionedGVKs {
		// skip if passed in unversioned object is not internal.
		if unversionedGVK.Version != runtime.APIVersionInternal {
			continue
		}
		gvs := scheme.VersionsForGroupKind(unversionedGVK.GroupKind())
		for _, gv := range gvs {
			gvk := gv.WithKind(unversionedGVK.Kind)
			t.Run(gvk.String(), func(t *testing.T) {
				if gvk.Version != runtime.APIVersionInternal { // skip internal
					versionedNew, err := scheme.New(gvk)
					if err != nil {
						t.Fatal(err)
					}
					err = scheme.Convert(unversionedNew, versionedNew, nil)
					if ignoreConversionErrors && err != nil {
						t.Skipf("Failed to convert object from internal type to %s: %v", gvk.Version, err)
					} else if err != nil {
						t.Fatal(err)
					}
					var versionedOld runtime.Object
					if unversionedOld != nil {
						versionedOld, err = scheme.New(gvk)
						if err != nil {
							t.Fatal(err)
						}

						err = scheme.Convert(unversionedOld, versionedOld, nil)
						if ignoreConversionErrors && err != nil {
							t.Skipf("Failed to convert object from internal type to %s: %v", gvk.Version, err)
						} else if err != nil {
							t.Fatal(err)
						}
					}

					fn(t, gv.String(), scheme.ValidateUpdate(context.Background(), options, versionedNew, versionedOld, subresources...))
				}
			})
		}
	}
}
