/*
Copyright 2019 The Crossplane 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 test

import (
	"context"

	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

var _ client.Client = &MockClient{}

// A MockGetFn is used to mock client.Client's Get implementation.
type MockGetFn func(ctx context.Context, key client.ObjectKey, obj client.Object) error

// A MockListFn is used to mock client.Client's List implementation.
type MockListFn func(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error

// A MockCreateFn is used to mock client.Client's Create implementation.
type MockCreateFn func(ctx context.Context, obj client.Object, opts ...client.CreateOption) error

// A MockDeleteFn is used to mock client.Client's Delete implementation.
type MockDeleteFn func(ctx context.Context, obj client.Object, opts ...client.DeleteOption) error

// A MockDeleteAllOfFn is used to mock client.Client's Delete implementation.
type MockDeleteAllOfFn func(ctx context.Context, obj client.Object, opts ...client.DeleteAllOfOption) error

// A MockUpdateFn is used to mock client.Client's Update implementation.
type MockUpdateFn func(ctx context.Context, obj client.Object, opts ...client.UpdateOption) error

// A MockPatchFn is used to mock client.Client's Patch implementation.
type MockPatchFn func(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.PatchOption) error

// A MockSubResourceGetFn is used to mock client.SubResourceClient's get implementation.
type MockSubResourceGetFn func(ctx context.Context, obj, subResource client.Object, opts ...client.SubResourceGetOption) error

// A MockSubResourceCreateFn is used to mock client.SubResourceClient's create implementation.
type MockSubResourceCreateFn func(ctx context.Context, obj, subResource client.Object, opts ...client.SubResourceCreateOption) error

// A MockSubResourceUpdateFn is used to mock client.SubResourceClient's update implementation.
type MockSubResourceUpdateFn func(ctx context.Context, obj client.Object, opts ...client.SubResourceUpdateOption) error

// A MockSubResourcePatchFn is used to mock client.SubResourceClient's patch implementation.
type MockSubResourcePatchFn func(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.SubResourcePatchOption) error

// A MockSchemeFn is used to mock client.Client's Scheme implementation.
type MockSchemeFn func() *runtime.Scheme

// A MockGroupVersionKindForFn is used to mock client.Client's GroupVersionKindFor implementation.
type MockGroupVersionKindForFn func(runtime.Object) (schema.GroupVersionKind, error)

// A MockIsObjectNamespacedFn is used to mock client.Client's IsObjectNamespaced implementation.
type MockIsObjectNamespacedFn func(runtime.Object) (bool, error)

// An ObjectFn operates on the supplied Object. You might use an ObjectFn to
// test or update the contents of an Object.
type ObjectFn func(obj client.Object) error

// An RuntimeObjectFn operates on the supplied Object. You might use an RuntimeObjectFn to
// test or update the contents of an runtime.Object.
type RuntimeObjectFn func(obj runtime.Object) error

// An ObjectListFn operates on the supplied ObjectList. You might use an
// ObjectListFn to test or update the contents of an ObjectList.
type ObjectListFn func(obj client.ObjectList) error

// NewMockGetFn returns a MockGetFn that returns the supplied error.
func NewMockGetFn(err error, ofn ...ObjectFn) MockGetFn {
	return func(_ context.Context, _ client.ObjectKey, obj client.Object) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockListFn returns a MockListFn that returns the supplied error.
func NewMockListFn(err error, ofn ...ObjectListFn) MockListFn {
	return func(_ context.Context, obj client.ObjectList, _ ...client.ListOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockCreateFn returns a MockCreateFn that returns the supplied error.
func NewMockCreateFn(err error, ofn ...ObjectFn) MockCreateFn {
	return func(_ context.Context, obj client.Object, _ ...client.CreateOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockDeleteFn returns a MockDeleteFn that returns the supplied error.
func NewMockDeleteFn(err error, ofn ...ObjectFn) MockDeleteFn {
	return func(_ context.Context, obj client.Object, _ ...client.DeleteOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockDeleteAllOfFn returns a MockDeleteAllOfFn that returns the supplied error.
func NewMockDeleteAllOfFn(err error, ofn ...ObjectFn) MockDeleteAllOfFn {
	return func(_ context.Context, obj client.Object, _ ...client.DeleteAllOfOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockUpdateFn returns a MockUpdateFn that returns the supplied error.
func NewMockUpdateFn(err error, ofn ...ObjectFn) MockUpdateFn {
	return func(_ context.Context, obj client.Object, _ ...client.UpdateOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockPatchFn returns a MockPatchFn that returns the supplied error.
func NewMockPatchFn(err error, ofn ...ObjectFn) MockPatchFn {
	return func(_ context.Context, obj client.Object, _ client.Patch, _ ...client.PatchOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockSubResourceCreateFn returns a MockSubResourceCreateFn that returns the supplied error.
func NewMockSubResourceCreateFn(err error, ofn ...ObjectFn) MockSubResourceCreateFn {
	return func(_ context.Context, obj, _ client.Object, _ ...client.SubResourceCreateOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockSubResourceUpdateFn returns a MockSubResourceUpdateFn that returns the supplied error.
func NewMockSubResourceUpdateFn(err error, ofn ...ObjectFn) MockSubResourceUpdateFn {
	return func(_ context.Context, obj client.Object, _ ...client.SubResourceUpdateOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockSubResourcePatchFn returns a MockSubResourcePatchFn that returns the supplied error.
func NewMockSubResourcePatchFn(err error, ofn ...ObjectFn) MockSubResourcePatchFn {
	return func(_ context.Context, obj client.Object, _ client.Patch, _ ...client.SubResourcePatchOption) error {
		for _, fn := range ofn {
			if err := fn(obj); err != nil {
				return err
			}
		}
		return err
	}
}

// NewMockSchemeFn returns a MockSchemeFn that returns the scheme.
func NewMockSchemeFn(scheme *runtime.Scheme) MockSchemeFn {
	return func() *runtime.Scheme {
		return scheme
	}
}

// NewMockGroupVersionKindForFn returns a MockGroupVersionKindForFn that returns the supplied GVK and error.
func NewMockGroupVersionKindForFn(err error, gvk schema.GroupVersionKind, rofn ...RuntimeObjectFn) MockGroupVersionKindForFn {
	return func(obj runtime.Object) (schema.GroupVersionKind, error) {
		for _, fn := range rofn {
			if err := fn(obj); err != nil {
				return gvk, err
			}
		}
		return gvk, err
	}
}

// NewMockIsObjectNamespacedFn returns a MockGroupVersionKindForFn that returns the supplied GVK and error.
func NewMockIsObjectNamespacedFn(err error, isNamespaced bool, rofn ...RuntimeObjectFn) MockIsObjectNamespacedFn {
	return func(obj runtime.Object) (bool, error) {
		for _, fn := range rofn {
			if err := fn(obj); err != nil {
				return isNamespaced, err
			}
		}
		return isNamespaced, err
	}
}

// MockClient implements controller-runtime's Client interface, allowing each
// method to be overridden for testing. The controller-runtime provides a fake
// client, but it is has surprising side effects (e.g. silently calling
// os.Exit(1)) and does not allow us control over the errors it returns.
type MockClient struct {
	MockGet         MockGetFn
	MockList        MockListFn
	MockCreate      MockCreateFn
	MockDelete      MockDeleteFn
	MockDeleteAllOf MockDeleteAllOfFn
	MockUpdate      MockUpdateFn
	MockPatch       MockPatchFn

	MockStatusCreate MockSubResourceCreateFn
	MockStatusUpdate MockSubResourceUpdateFn
	MockStatusPatch  MockSubResourcePatchFn

	MockSubResourceGet    MockSubResourceGetFn
	MockSubResourceCreate MockSubResourceCreateFn
	MockSubResourceUpdate MockSubResourceUpdateFn
	MockSubResourcePatch  MockSubResourcePatchFn

	MockScheme              MockSchemeFn
	MockGroupVersionKindFor MockGroupVersionKindForFn
	MockIsObjectNamespaced  MockIsObjectNamespacedFn
}

// NewMockClient returns a MockClient that does nothing when its methods are
// called.
func NewMockClient() *MockClient {
	return &MockClient{
		MockGet:         NewMockGetFn(nil),
		MockList:        NewMockListFn(nil),
		MockCreate:      NewMockCreateFn(nil),
		MockDelete:      NewMockDeleteFn(nil),
		MockDeleteAllOf: NewMockDeleteAllOfFn(nil),
		MockUpdate:      NewMockUpdateFn(nil),
		MockPatch:       NewMockPatchFn(nil),

		MockStatusUpdate: NewMockSubResourceUpdateFn(nil),
		MockStatusPatch:  NewMockSubResourcePatchFn(nil),

		MockScheme:              NewMockSchemeFn(nil),
		MockGroupVersionKindFor: NewMockGroupVersionKindForFn(nil, schema.GroupVersionKind{}),
		MockIsObjectNamespaced:  NewMockIsObjectNamespacedFn(nil, false),
	}
}

// Get calls MockClient's MockGet function.
func (c *MockClient) Get(ctx context.Context, key client.ObjectKey, obj client.Object, _ ...client.GetOption) error {
	return c.MockGet(ctx, key, obj)
}

// List calls MockClient's MockList function.
func (c *MockClient) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error {
	return c.MockList(ctx, list, opts...)
}

// Create calls MockClient's MockCreate function.
func (c *MockClient) Create(ctx context.Context, obj client.Object, opts ...client.CreateOption) error {
	return c.MockCreate(ctx, obj, opts...)
}

// Delete calls MockClient's MockDelete function.
func (c *MockClient) Delete(ctx context.Context, obj client.Object, opts ...client.DeleteOption) error {
	return c.MockDelete(ctx, obj, opts...)
}

// DeleteAllOf calls MockClient's DeleteAllOf function.
func (c *MockClient) DeleteAllOf(ctx context.Context, obj client.Object, opts ...client.DeleteAllOfOption) error {
	return c.MockDeleteAllOf(ctx, obj, opts...)
}

// Update calls MockClient's MockUpdate function.
func (c *MockClient) Update(ctx context.Context, obj client.Object, opts ...client.UpdateOption) error {
	return c.MockUpdate(ctx, obj, opts...)
}

// Patch calls MockClient's MockPatch function.
func (c *MockClient) Patch(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.PatchOption) error {
	return c.MockPatch(ctx, obj, patch, opts...)
}

// Status returns status writer for status sub-resource.
func (c *MockClient) Status() client.SubResourceWriter {
	return &MockSubResourceClient{
		MockCreate: c.MockStatusCreate,
		MockUpdate: c.MockStatusUpdate,
		MockPatch:  c.MockStatusPatch,
	}
}

// SubResource is unimplemented. It panics if called.
func (c *MockClient) SubResource(_ string) client.SubResourceClient {
	return &MockSubResourceClient{
		MockGet:    c.MockSubResourceGet,
		MockCreate: c.MockSubResourceCreate,
		MockUpdate: c.MockSubResourceUpdate,
		MockPatch:  c.MockSubResourcePatch,
	}
}

// RESTMapper returns the REST mapper.
func (c *MockClient) RESTMapper() meta.RESTMapper {
	return nil
}

// Scheme calls MockClient's MockScheme function.
func (c *MockClient) Scheme() *runtime.Scheme {
	return c.MockScheme()
}

// GroupVersionKindFor calls MockClient's MockGroupVersionKindFor function.
func (c *MockClient) GroupVersionKindFor(obj runtime.Object) (schema.GroupVersionKind, error) {
	return c.MockGroupVersionKindFor(obj)
}

// IsObjectNamespaced calls MockClient's MockIsObjectNamespaced function.
func (c *MockClient) IsObjectNamespaced(obj runtime.Object) (bool, error) {
	return c.MockIsObjectNamespaced(obj)
}

// MockSubResourceClient provides mock functionality for status sub-resource.
type MockSubResourceClient struct {
	MockGet    MockSubResourceGetFn
	MockCreate MockSubResourceCreateFn
	MockUpdate MockSubResourceUpdateFn
	MockPatch  MockSubResourcePatchFn
}

// Get a sub-resource.
func (m *MockSubResourceClient) Get(ctx context.Context, obj, subResource client.Object, opts ...client.SubResourceGetOption) error {
	return m.MockGet(ctx, obj, subResource, opts...)
}

// Create a sub-resource.
func (m *MockSubResourceClient) Create(ctx context.Context, obj, subResource client.Object, opts ...client.SubResourceCreateOption) error {
	return m.MockCreate(ctx, obj, subResource, opts...)
}

// Update a sub-resource.
func (m *MockSubResourceClient) Update(ctx context.Context, obj client.Object, opts ...client.SubResourceUpdateOption) error {
	return m.MockUpdate(ctx, obj, opts...)
}

// Patch a sub-resource.
func (m *MockSubResourceClient) Patch(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.SubResourcePatchOption) error {
	return m.MockPatch(ctx, obj, patch, opts...)
}