/*
   Copyright Docker attest 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 attestation

import (
	"context"

	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/oci"
	v1 "github.com/google/go-containerregistry/pkg/v1"
)

// ensure MockResolver implements Resolver.
var _ oci.ImageDetailsResolver = MockResolver{}

type MockResolver struct {
	Envs         []*EnvelopeReference
	Image        string
	PlatformFn   func() (*v1.Platform, error)
	DescriptorFn func() (*v1.Descriptor, error)
	ImangeNameFn func() (string, error)
}

func (r MockResolver) Attestations(_ context.Context, _ string) ([]*EnvelopeReference, error) {
	return r.Envs, nil
}

func (r MockResolver) ImageName(_ context.Context) (string, error) {
	if r.Image != "" {
		return r.Image, nil
	}
	if r.ImangeNameFn != nil {
		return r.ImangeNameFn()
	}
	return "library/alpine:latest", nil
}

func (r MockResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
	if r.DescriptorFn != nil {
		return r.DescriptorFn()
	}
	digest, err := v1.NewHash(test.UnsignedLinuxAMD64ImageDigest)
	if err != nil {
		return nil, err
	}
	return &v1.Descriptor{
		Digest:    digest,
		Size:      1234,
		MediaType: "application/vnd.oci.image.manifest.v1+json",
	}, nil
}

func (r MockResolver) ImagePlatform(_ context.Context) (*v1.Platform, error) {
	if r.PlatformFn != nil {
		return r.PlatformFn()
	}
	return oci.ParsePlatform("linux/amd64")
}

type MockRegistryResolver struct {
	Subject      *v1.Descriptor
	ImageNameStr string
	*MockResolver
}

func (r *MockRegistryResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
	return r.Subject, nil
}

func (r *MockRegistryResolver) ImageName(_ context.Context) (string, error) {
	return r.ImageNameStr, nil
}