/*
   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_test

import (
	"context"
	"path/filepath"
	"strings"
	"testing"

	"github.com/docker/attest"
	"github.com/docker/attest/attestation"
	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/oci"
	"github.com/docker/attest/policy"
	v1 "github.com/google/go-containerregistry/pkg/v1"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestAttestationFromOCILayout(t *testing.T) {
	ctx, signer := test.Setup(t)
	outputLayout := test.CreateTempDir(t, "", "attest-oci-layout")

	invalidPlatform := &v1.Platform{
		Architecture: "invalid",
		OS:           "invalid",
	}

	opts := &attestation.SigningOptions{}
	attIdx, err := oci.IndexFromPath(test.UnsignedTestIndex(".."))
	require.NoError(t, err)
	signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
	require.NoError(t, err)
	signedIndex := attIdx.Index
	signedIndex, err = attestation.UpdateIndexImages(signedIndex, signedManifests)
	require.NoError(t, err)
	spec, err := oci.ParseImageSpec(oci.LocalPrefix + outputLayout)
	require.NoError(t, err)
	err = oci.SaveIndex(ctx, []*oci.ImageSpec{spec}, signedIndex, "docker.io/library/test-image:test")
	require.NoError(t, err)

	testCases := []struct {
		name     string
		platform *v1.Platform
		errorStr string
	}{
		{name: "nominal", platform: spec.Platform},
		{name: "invalid platform", platform: invalidPlatform, errorStr: "platform not found in index"},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			spec := &oci.ImageSpec{
				Type:       oci.OCI,
				Identifier: outputLayout,
				Platform:   tc.platform,
			}
			resolver, err := policy.CreateImageDetailsResolver(spec)
			if tc.errorStr != "" {
				require.Error(t, err)
				assert.Contains(t, err.Error(), tc.errorStr)
				return
			}
			require.NoError(t, err)
			desc, err := resolver.ImageDescriptor(ctx)
			require.NoError(t, err)
			digest := desc.Digest.String()
			assert.True(t, strings.Contains(digest, "sha256:"))
		})
	}
}

func TestSubjectNameAnnotations(t *testing.T) {
	testCases := []struct {
		name          string
		ociLayoutPath string
		errorStr      string
	}{
		{name: "oci annotation", ociLayoutPath: test.UnsignedTestIndex("..")},
		{name: "containerd annotation", ociLayoutPath: filepath.Join("..", "test", "testdata", "containerd-subject-layout")},
		{name: "missing subject name", ociLayoutPath: filepath.Join("..", "test", "testdata", "missing-subject-layout"), errorStr: "failed to find subject name in annotations"},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			spec, err := oci.ParseImageSpec(oci.LocalPrefix+tc.ociLayoutPath, oci.WithPlatform("linux/arm64"))
			require.NoError(t, err)
			_, err = policy.CreateImageDetailsResolver(spec)
			if tc.errorStr != "" {
				require.Error(t, err)
				assert.Contains(t, err.Error(), tc.errorStr)
				return
			}
			require.NoError(t, err)
		})
	}
}

func TestImageDetailsFromImageLayout(t *testing.T) {
	spec, err := oci.ParseImageSpec(oci.LocalPrefix+test.UnsignedTestImage(".."), oci.WithPlatform("linux/arm64"))
	require.NoError(t, err)
	resolver, err := policy.CreateImageDetailsResolver(spec)
	require.NoError(t, err)
	desc, err := resolver.ImageDescriptor(context.Background())
	require.NoError(t, err)
	digest := desc.Digest.String()
	assert.Equal(t, "sha256:7ae6b41655929ad8e1848064874a98ac3f68884996c79907f6525e3045f75390", digest)
}