/*
   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 mirror

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"

	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/tuf"
	"github.com/stretchr/testify/assert"
)

type Layer struct {
	Annotations map[string]string `json:"annotations"`
	Digest      string            `json:"digest"`
}
type Layers struct {
	Layers []Layer `json:"layers"`
}

func TestGetTufTargetsMirror(t *testing.T) {
	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
	defer server.Close()

	path := test.CreateTempDir(t, "", "tuf_temp")
	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
	assert.NoError(t, err)

	targets, err := m.GetTUFTargetMirrors()
	assert.NoError(t, err)
	assert.Greater(t, len(targets), 0)

	// check for image layer annotations
	for _, target := range targets {
		img := target.Image
		mf, err := img.RawManifest()
		assert.NoError(t, err)

		// unmarshal manifest with annotations
		l := &Layers{}
		err = json.Unmarshal(mf, l)
		assert.NoError(t, err)

		// check that layers are annotated
		for _, layer := range l.Layers {
			ann, ok := layer.Annotations[tufFileAnnotation]
			assert.True(t, ok)
			parts := strings.Split(ann, ".")
			// <digest>.filename.<ext|optional>
			assert.GreaterOrEqual(t, len(parts), 2)
		}
	}
}

func TestTargetDelegationMetadata(t *testing.T) {
	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
	defer server.Close()

	path := test.CreateTempDir(t, "", "tuf_temp")
	tm, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
	assert.NoError(t, err)

	targets, err := tm.TUFClient.LoadDelegatedTargets("test-role", "targets")
	assert.NoError(t, err)
	assert.Greater(t, len(targets.Signed.Targets), 0)
}

func TestGetDelegatedTargetMirrors(t *testing.T) {
	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
	defer server.Close()

	path := test.CreateTempDir(t, "", "tuf_temp")
	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
	assert.NoError(t, err)

	mirrors, err := m.GetDelegatedTargetMirrors()
	assert.NoError(t, err)
	assert.Greater(t, len(mirrors), 0)

	// check for index image annotations
	for _, mirror := range mirrors {
		idx := mirror.Index
		mf, err := idx.RawManifest()
		assert.NoError(t, err)

		// unmarshal manifest with annotations
		l := &Layers{}
		err = json.Unmarshal(mf, l)
		assert.NoError(t, err)

		// check that layers are annotated
		for _, layer := range l.Layers {
			ann, ok := layer.Annotations[tufFileAnnotation]
			assert.True(t, ok)
			parts := strings.Split(ann, ".")
			// <subdir>/<digest>.filename.<ext|optional>
			assert.GreaterOrEqual(t, len(parts), 2)
		}
	}
}