package sync

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path"
	"testing"
	"time"

	"github.com/anuvu/zot/errors"
	"github.com/anuvu/zot/pkg/extensions/monitoring"
	"github.com/anuvu/zot/pkg/log"
	"github.com/anuvu/zot/pkg/storage"
	"github.com/containers/image/v5/docker"
	"github.com/containers/image/v5/docker/reference"
	"github.com/containers/image/v5/types"
	godigest "github.com/opencontainers/go-digest"
	ispec "github.com/opencontainers/image-spec/specs-go/v1"
	"github.com/rs/zerolog"
	. "github.com/smartystreets/goconvey/convey"
)

const (
	BaseURL    = "http://127.0.0.1:5001"
	ServerCert = "../../../test/data/server.cert"
	ServerKey  = "../../../test/data/server.key"
	CACert     = "../../../test/data/ca.crt"

	testImage    = "zot-test"
	testImageTag = "0.0.1"

	host = "127.0.0.1:45117"
)

func copyFiles(sourceDir string, destDir string) error {
	sourceMeta, err := os.Stat(sourceDir)
	if err != nil {
		return err
	}

	if err := os.MkdirAll(destDir, sourceMeta.Mode()); err != nil {
		return err
	}

	files, err := ioutil.ReadDir(sourceDir)
	if err != nil {
		return err
	}

	for _, file := range files {
		sourceFilePath := path.Join(sourceDir, file.Name())
		destFilePath := path.Join(destDir, file.Name())

		if file.IsDir() {
			if err = copyFiles(sourceFilePath, destFilePath); err != nil {
				return err
			}
		} else {
			sourceFile, err := os.Open(sourceFilePath)
			if err != nil {
				return err
			}
			defer sourceFile.Close()

			destFile, err := os.Create(destFilePath)
			if err != nil {
				return err
			}
			defer destFile.Close()

			if _, err = io.Copy(destFile, sourceFile); err != nil {
				return err
			}
		}
	}

	return nil
}

func TestSyncInternal(t *testing.T) {
	Convey("Verify parseRepositoryReference func", t, func() {
		repositoryReference := fmt.Sprintf("%s/%s", host, testImage)
		ref, err := parseRepositoryReference(repositoryReference)
		So(err, ShouldBeNil)
		So(ref.Name(), ShouldEqual, repositoryReference)

		repositoryReference = fmt.Sprintf("%s/%s:tagged", host, testImage)
		_, err = parseRepositoryReference(repositoryReference)
		So(err, ShouldEqual, errors.ErrInvalidRepositoryName)

		repositoryReference = fmt.Sprintf("http://%s/%s", host, testImage)
		_, err = parseRepositoryReference(repositoryReference)
		So(err, ShouldNotBeNil)

		repositoryReference = fmt.Sprintf("docker://%s/%s", host, testImage)
		_, err = parseRepositoryReference(repositoryReference)
		So(err, ShouldNotBeNil)

		_, err = getFileCredentials("/path/to/inexistent/file")
		So(err, ShouldNotBeNil)

		f, err := ioutil.TempFile("", "sync-credentials-")
		if err != nil {
			panic(err)
		}

		content := []byte(`{`)
		if err := ioutil.WriteFile(f.Name(), content, 0600); err != nil {
			panic(err)
		}

		_, err = getFileCredentials(f.Name())
		So(err, ShouldNotBeNil)

		srcCtx := &types.SystemContext{}
		_, err = getImageTags(context.Background(), srcCtx, ref)
		So(err, ShouldNotBeNil)

		taggedRef, err := reference.WithTag(ref, "tag")
		So(err, ShouldBeNil)

		_, err = getImageTags(context.Background(), &types.SystemContext{}, taggedRef)
		So(err, ShouldNotBeNil)

		dockerRef, err := docker.NewReference(taggedRef)
		So(err, ShouldBeNil)

		//tag := getTagFromRef(dockerRef, log.NewLogger("", ""))

		So(getTagFromRef(dockerRef, log.NewLogger("debug", "")), ShouldNotBeNil)

		var tlsVerify bool
		updateDuration := time.Microsecond
		syncRegistryConfig := RegistryConfig{
			Content: []Content{
				{
					Prefix: testImage,
				},
			},
			URL:          BaseURL,
			PollInterval: updateDuration,
			TLSVerify:    &tlsVerify,
			CertDir:      "",
		}

		cfg := Config{Registries: []RegistryConfig{syncRegistryConfig}, CredentialsFile: "/invalid/path/to/file"}

		So(Run(cfg, storage.StoreController{}, log.NewLogger("debug", "")), ShouldNotBeNil)

		_, err = getFileCredentials("/invalid/path/to/file")
		So(err, ShouldNotBeNil)
	})

	Convey("Test getUpstreamCatalog() with missing certs", t, func() {
		var tlsVerify bool
		updateDuration := time.Microsecond
		syncRegistryConfig := RegistryConfig{
			Content: []Content{
				{
					Prefix: testImage,
				},
			},
			URL:          BaseURL,
			PollInterval: updateDuration,
			TLSVerify:    &tlsVerify,
			CertDir:      "/tmp/missing_certs/a/b/c/d/z",
		}

		_, err := getUpstreamCatalog(&syncRegistryConfig, Credentials{}, log.NewLogger("debug", ""))
		So(err, ShouldNotBeNil)
	})

	Convey("Test getUpstreamCatalog() with bad certs", t, func() {
		badCertsDir, err := ioutil.TempDir("", "bad_certs*")
		if err != nil {
			panic(err)
		}

		if err := os.WriteFile(path.Join(badCertsDir, "ca.crt"), []byte("certificate"), 0755); err != nil {
			panic(err)
		}

		defer os.RemoveAll(badCertsDir)

		var tlsVerify bool
		updateDuration := time.Microsecond
		syncRegistryConfig := RegistryConfig{
			Content: []Content{
				{
					Prefix: testImage,
				},
			},
			URL:          BaseURL,
			PollInterval: updateDuration,
			TLSVerify:    &tlsVerify,
			CertDir:      badCertsDir,
		}

		_, err = getUpstreamCatalog(&syncRegistryConfig, Credentials{}, log.NewLogger("debug", ""))
		So(err, ShouldNotBeNil)
	})

	Convey("Test imagesToCopyFromUpstream()", t, func() {
		repos := []string{"repo1"}
		upstreamCtx := &types.SystemContext{}

		_, err := imagesToCopyFromUpstream("localhost:4566", repos, upstreamCtx, Content{}, log.NewLogger("debug", ""))
		So(err, ShouldNotBeNil)

		_, err = imagesToCopyFromUpstream("docker://localhost:4566", repos, upstreamCtx,
			Content{}, log.NewLogger("debug", ""))
		So(err, ShouldNotBeNil)
	})

	Convey("Verify pushSyncedLocalImage func", t, func() {
		storageDir, err := ioutil.TempDir("", "oci-dest-repo-test")
		if err != nil {
			panic(err)
		}

		defer os.RemoveAll(storageDir)

		log := log.Logger{Logger: zerolog.New(os.Stdout)}
		metrics := monitoring.NewMetricsServer(false, log)

		imageStore := storage.NewImageStore(storageDir, false, false, log, metrics)

		storeController := storage.StoreController{}
		storeController.DefaultStore = imageStore

		err = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
		So(err, ShouldNotBeNil)

		testRootDir := path.Join(imageStore.RootDir(), testImage, SyncBlobUploadDir)
		//testImagePath := path.Join(testRootDir, testImage)

		err = os.MkdirAll(testRootDir, 0755)
		if err != nil {
			panic(err)
		}

		err = copyFiles("../../../test/data", testRootDir)
		if err != nil {
			panic(err)
		}

		testImageStore := storage.NewImageStore(testRootDir, false, false, log, metrics)
		manifestContent, _, _, err := testImageStore.GetImageManifest(testImage, testImageTag)
		So(err, ShouldBeNil)

		var manifest ispec.Manifest

		if err := json.Unmarshal(manifestContent, &manifest); err != nil {
			panic(err)
		}

		if err := os.Chmod(storageDir, 0000); err != nil {
			panic(err)
		}

		if os.Geteuid() != 0 {
			So(func() {
				_ = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
			},
				ShouldPanic)
		}

		if err := os.Chmod(storageDir, 0755); err != nil {
			panic(err)
		}

		if err := os.Chmod(path.Join(testRootDir, testImage, "blobs", "sha256",
			manifest.Layers[0].Digest.Hex()), 0000); err != nil {
			panic(err)
		}

		err = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
		So(err, ShouldNotBeNil)

		if err := os.Chmod(path.Join(testRootDir, testImage, "blobs", "sha256",
			manifest.Layers[0].Digest.Hex()), 0755); err != nil {
			panic(err)
		}

		cachedManifestConfigPath := path.Join(imageStore.RootDir(), testImage, SyncBlobUploadDir,
			testImage, "blobs", "sha256", manifest.Config.Digest.Hex())
		if err := os.Chmod(cachedManifestConfigPath, 0000); err != nil {
			panic(err)
		}

		err = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
		So(err, ShouldNotBeNil)

		if err := os.Chmod(cachedManifestConfigPath, 0755); err != nil {
			panic(err)
		}

		manifestConfigPath := path.Join(imageStore.RootDir(), testImage, "blobs", "sha256", manifest.Config.Digest.Hex())
		if err := os.MkdirAll(manifestConfigPath, 0000); err != nil {
			panic(err)
		}

		err = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
		So(err, ShouldNotBeNil)

		if err := os.Remove(manifestConfigPath); err != nil {
			panic(err)
		}

		mDigest := godigest.FromBytes(manifestContent)

		manifestPath := path.Join(imageStore.RootDir(), testImage, "blobs", mDigest.Algorithm().String(), mDigest.Encoded())
		if err := os.MkdirAll(manifestPath, 0000); err != nil {
			panic(err)
		}

		err = pushSyncedLocalImage(testImage, testImageTag, "", storeController, log)
		So(err, ShouldNotBeNil)
	})
}