// Copyright (c) 2026 Tigera, Inc. All rights reserved.

// 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 extensions

import (
	"context"

	corev1 "k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"github.com/projectcalico/calico/operator/pkg/controller"
	"github.com/projectcalico/calico/operator/pkg/render"
)

// GatewayAPIExtension is the variant's hook into the gateway API controller.
type GatewayAPIExtension interface {
	// Images overrides the images the gateway API render resolves.

	// ExtendInputs resolves what the modifier needs but cannot read for itself.
	ExtendInputs(ctx context.Context, ci controller.Inputs) (controller.Inputs, error)

	// Modify layers the variant onto a component the controller rendered.
	Modify(c render.Component, ri render.Inputs) render.Component

	// GatewayNamespaceObjects returns what a namespace hosting a Gateway needs
	// beyond the trusted bundle the core operator writes there.
	GatewayNamespaceObjects(namespace string, pullSecrets []*corev1.Secret) []client.Object
}

// noopGatewayAPI runs the core operator's behavior unchanged.
type noopGatewayAPI struct{}

func (noopGatewayAPI) ExtendInputs(_ context.Context, ci controller.Inputs) (controller.Inputs, error) {
	return ci, nil
}

func (noopGatewayAPI) Modify(c render.Component, _ render.Inputs) render.Component {
	return c
}

func (noopGatewayAPI) GatewayNamespaceObjects(string, []*corev1.Secret) []client.Object {
	return nil
}