/*
   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"
	"strconv"
	"strings"
	"testing"

	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/tuf"
	"github.com/stretchr/testify/assert"
	"github.com/theupdateframework/go-tuf/v2/metadata"
)

const (
	metadataPath = "/metadata"
	targetsPath  = "/targets"
)

func TestGetTufMetadataMirror(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)

	tufMetadata, err := m.getMetadataMirror(server.URL + metadataPath)
	assert.NoError(t, err)

	// check that all roles are not empty
	assert.Greater(t, len(tufMetadata.Root), 0)
	assert.Greater(t, len(tufMetadata.Snapshot), 0)
	assert.Greater(t, len(tufMetadata.Targets), 0)
	assert.Greater(t, len(tufMetadata.Timestamp), 0)
}

func TestGetMetadataManifest(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)

	img, err := m.GetMetadataManifest(server.URL + metadataPath)
	assert.NoError(t, err)
	assert.NotNil(t, img)

	mf, err := img.RawManifest()
	assert.NoError(t, err)

	type Annotations struct {
		Annotations map[string]string `json:"annotations"`
	}
	type Layers struct {
		Layers []Annotations `json:"layers"`
	}
	l := &Layers{}
	err = json.Unmarshal(mf, l)
	assert.NoError(t, err)

	// check that layers are annotated and use consistent snapshot naming
	for _, layer := range l.Layers {
		ann, ok := layer.Annotations[tufFileAnnotation]
		assert.True(t, ok)
		// check for consistent snapshot version
		parts := strings.Split(ann, ".")
		if parts[0] == metadata.TIMESTAMP {
			continue
		}
		_, err := strconv.Atoi(parts[0])
		assert.NoError(t, err)
	}
}

func TestGetDelegatedMetadataMirrors(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)

	delegations, err := m.GetDelegatedMetadataMirrors()
	assert.NoError(t, err)

	assert.NotNil(t, delegations)
	assert.Greater(t, len(delegations), 0)
}