package search

//go:generate go run github.com/99designs/gqlgen

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	godigest "github.com/opencontainers/go-digest"
	"zotregistry.io/zot/pkg/log"

	"zotregistry.io/zot/pkg/extensions/search/common"
	cveinfo "zotregistry.io/zot/pkg/extensions/search/cve"
	digestinfo "zotregistry.io/zot/pkg/extensions/search/digest"
	"zotregistry.io/zot/pkg/storage"
) // THIS CODE IS A STARTING POINT ONLY. IT WILL NOT BE UPDATED WITH SCHEMA CHANGES.

// Resolver ...
type Resolver struct {
	cveInfo         *cveinfo.CveInfo
	storeController storage.StoreController
	digestInfo      *digestinfo.DigestInfo
	log             log.Logger
}

// Query ...
func (r *Resolver) Query() QueryResolver {
	return &queryResolver{r}
}

type queryResolver struct{ *Resolver }

type cveDetail struct {
	Title       string
	Description string
	Severity    string
	PackageList []*PackageInfo
}

// GetResolverConfig ...
func GetResolverConfig(log log.Logger, storeController storage.StoreController, enableCVE bool) Config {
	var cveInfo *cveinfo.CveInfo

	var err error

	if enableCVE {
		cveInfo, err = cveinfo.GetCVEInfo(storeController, log)
		if err != nil {
			panic(err)
		}
	}

	digestInfo := digestinfo.NewDigestInfo(storeController, log)

	resConfig := &Resolver{cveInfo: cveInfo, storeController: storeController, digestInfo: digestInfo, log: log}

	return Config{
		Resolvers: resConfig, Directives: DirectiveRoot{},
		Complexity: ComplexityRoot{},
	}
}

func (r *queryResolver) ExpandedRepoInfo(ctx context.Context, name string) (*RepoInfo, error) {
	olu := common.NewOciLayoutUtils(r.storeController, r.log)

	repo, err := olu.GetExpandedRepoInfo(name)
	if err != nil {
		r.log.Error().Err(err).Msg("error getting repos")

		return &RepoInfo{}, err
	}

	// repos type is of common deep copy this to search
	repoInfo := &RepoInfo{}

	manifests := make([]*ManifestInfo, 0)

	for _, manifest := range repo.Manifests {
		tag := manifest.Tag

		digest := manifest.Digest

		isSigned := manifest.IsSigned

		manifestInfo := &ManifestInfo{Tag: &tag, Digest: &digest, IsSigned: &isSigned}

		layers := make([]*LayerInfo, 0)

		for _, l := range manifest.Layers {
			size := l.Size

			digest := l.Digest

			layerInfo := &LayerInfo{Digest: &digest, Size: &size}

			layers = append(layers, layerInfo)
		}

		manifestInfo.Layers = layers

		manifests = append(manifests, manifestInfo)
	}

	repoInfo.Manifests = manifests

	return repoInfo, nil
}

func (r *queryResolver) CVEListForImage(ctx context.Context, image string) (*CVEResultForImage, error) {
	trivyCtx := r.cveInfo.GetTrivyContext(image)

	r.log.Info().Str("image", image).Msg("scanning image")

	isValidImage, err := r.cveInfo.LayoutUtils.IsValidImageFormat(image)
	if !isValidImage {
		r.log.Debug().Str("image", image).Msg("image media type not supported for scanning")

		return &CVEResultForImage{}, err
	}

	report, err := cveinfo.ScanImage(trivyCtx.Ctx)
	if err != nil {
		r.log.Error().Err(err).Msg("unable to scan image repository")

		return &CVEResultForImage{}, err
	}

	var copyImgTag string

	if strings.Contains(image, ":") {
		copyImgTag = strings.Split(image, ":")[1]
	}

	cveidMap := make(map[string]cveDetail)

	for _, result := range report.Results {
		for _, vulnerability := range result.Vulnerabilities {
			pkgName := vulnerability.PkgName

			installedVersion := vulnerability.InstalledVersion

			var fixedVersion string
			if vulnerability.FixedVersion != "" {
				fixedVersion = vulnerability.FixedVersion
			} else {
				fixedVersion = "Not Specified"
			}

			_, ok := cveidMap[vulnerability.VulnerabilityID]
			if ok {
				cveDetailStruct := cveidMap[vulnerability.VulnerabilityID]

				pkgList := cveDetailStruct.PackageList

				pkgList = append(pkgList,
					&PackageInfo{Name: &pkgName, InstalledVersion: &installedVersion, FixedVersion: &fixedVersion})

				cveDetailStruct.PackageList = pkgList

				cveidMap[vulnerability.VulnerabilityID] = cveDetailStruct
			} else {
				newPkgList := make([]*PackageInfo, 0)

				newPkgList = append(newPkgList,
					&PackageInfo{Name: &pkgName, InstalledVersion: &installedVersion, FixedVersion: &fixedVersion})

				cveidMap[vulnerability.VulnerabilityID] = cveDetail{
					Title:       vulnerability.Title,
					Description: vulnerability.Description, Severity: vulnerability.Severity, PackageList: newPkgList,
				}
			}
		}
	}

	cveids := []*Cve{}

	for id, cveDetail := range cveidMap {
		vulID := id

		desc := cveDetail.Description

		title := cveDetail.Title

		severity := cveDetail.Severity

		pkgList := cveDetail.PackageList

		cveids = append(cveids,
			&Cve{ID: &vulID, Title: &title, Description: &desc, Severity: &severity, PackageList: pkgList})
	}

	return &CVEResultForImage{Tag: &copyImgTag, CVEList: cveids}, nil
}

func (r *queryResolver) ImageListForCve(ctx context.Context, cvid string) ([]*ImgResultForCve, error) {
	finalCveResult := []*ImgResultForCve{}

	r.log.Info().Msg("extracting repositories")

	defaultStore := r.storeController.DefaultStore

	defaultTrivyCtx := r.cveInfo.CveTrivyController.DefaultCveConfig

	repoList, err := defaultStore.GetRepositories()
	if err != nil {
		r.log.Error().Err(err).Msg("unable to search repositories")

		return finalCveResult, err
	}

	r.cveInfo.Log.Info().Msg("scanning each global repository")

	cveResult, err := r.getImageListForCVE(repoList, cvid, defaultStore, defaultTrivyCtx)
	if err != nil {
		r.log.Error().Err(err).Msg("error getting cve list for global repositories")

		return finalCveResult, err
	}

	finalCveResult = append(finalCveResult, cveResult...)

	subStore := r.storeController.SubStore

	for route, store := range subStore {
		subRepoList, err := store.GetRepositories()
		if err != nil {
			r.log.Error().Err(err).Msg("unable to search repositories")

			return cveResult, err
		}

		subTrivyCtx := r.cveInfo.CveTrivyController.SubCveConfig[route]

		subCveResult, err := r.getImageListForCVE(subRepoList, cvid, store, subTrivyCtx)
		if err != nil {
			r.log.Error().Err(err).Msg("unable to get cve result for sub repositories")

			return finalCveResult, err
		}

		finalCveResult = append(finalCveResult, subCveResult...)
	}

	return finalCveResult, nil
}

func (r *queryResolver) getImageListForCVE(repoList []string, cvid string, imgStore storage.ImageStore,
	trivyCtx *cveinfo.TrivyCtx) ([]*ImgResultForCve, error) {
	cveResult := []*ImgResultForCve{}

	for _, repo := range repoList {
		r.log.Info().Str("repo", repo).Msg("extracting list of tags available in image repo")

		name := repo

		tags, err := r.cveInfo.GetImageListForCVE(repo, cvid, imgStore, trivyCtx)
		if err != nil {
			r.log.Error().Err(err).Msg("error getting tag")

			return cveResult, err
		}

		if len(tags) != 0 {
			cveResult = append(cveResult, &ImgResultForCve{Name: &name, Tags: tags})
		}
	}

	return cveResult, nil
}

func (r *queryResolver) ImageListWithCVEFixed(ctx context.Context, cvid string, image string) (*ImgResultForFixedCve, error) { // nolint: lll
	imgResultForFixedCVE := &ImgResultForFixedCve{}

	r.log.Info().Str("image", image).Msg("extracting list of tags available in image")

	tagsInfo, err := r.cveInfo.LayoutUtils.GetImageTagsWithTimestamp(image)
	if err != nil {
		r.log.Error().Err(err).Msg("unable to read image tags")

		return imgResultForFixedCVE, err
	}

	infectedTags := make([]common.TagInfo, 0)

	var hasCVE bool

	for _, tag := range tagsInfo {
		image := fmt.Sprintf("%s:%s", image, tag.Name)

		isValidImage, _ := r.cveInfo.LayoutUtils.IsValidImageFormat(image)
		if !isValidImage {
			r.log.Debug().Str("image",
				fmt.Sprintf("%s:%s", image, tag.Name)).
				Msg("image media type not supported for scanning, adding as an infected image")

			infectedTags = append(infectedTags, common.TagInfo{Name: tag.Name, Timestamp: tag.Timestamp})

			continue
		}

		trivyCtx := r.cveInfo.GetTrivyContext(image)

		r.cveInfo.Log.Info().Str("image", fmt.Sprintf("%s:%s", image, tag.Name)).Msg("scanning image")

		report, err := cveinfo.ScanImage(trivyCtx.Ctx)
		if err != nil {
			r.log.Error().Err(err).
				Str("image", fmt.Sprintf("%s:%s", image, tag.Name)).Msg("unable to scan image")

			continue
		}

		hasCVE = false

		for _, result := range report.Results {
			for _, vulnerability := range result.Vulnerabilities {
				if vulnerability.VulnerabilityID == cvid {
					hasCVE = true

					break
				}
			}
		}

		if hasCVE {
			infectedTags = append(infectedTags, common.TagInfo{Name: tag.Name, Timestamp: tag.Timestamp, Digest: tag.Digest})
		}
	}

	var finalTagList []*TagInfo

	if len(infectedTags) != 0 {
		r.log.Info().Msg("comparing fixed tags timestamp")

		fixedTags := common.GetFixedTags(tagsInfo, infectedTags)

		finalTagList = getGraphqlCompatibleTags(fixedTags)
	} else {
		r.log.Info().Str("image", image).Str("cve-id", cvid).Msg("image does not contain any tag that have given cve")

		finalTagList = getGraphqlCompatibleTags(tagsInfo)
	}

	imgResultForFixedCVE = &ImgResultForFixedCve{Tags: finalTagList}

	return imgResultForFixedCVE, nil
}

func (r *queryResolver) ImageListForDigest(ctx context.Context, digestID string) ([]*ImgResultForDigest, error) {
	imgResultForDigest := []*ImgResultForDigest{}

	r.log.Info().Msg("extracting repositories")

	defaultStore := r.storeController.DefaultStore

	repoList, err := defaultStore.GetRepositories()
	if err != nil {
		r.log.Error().Err(err).Msg("unable to search repositories")

		return imgResultForDigest, err
	}

	r.log.Info().Msg("scanning each global repository")

	partialImgResultForDigest, err := r.getImageListForDigest(repoList, digestID)
	if err != nil {
		r.log.Error().Err(err).Msg("unable to get image and tag list for global repositories")

		return imgResultForDigest, err
	}

	imgResultForDigest = append(imgResultForDigest, partialImgResultForDigest...)

	subStore := r.storeController.SubStore
	for _, store := range subStore {
		subRepoList, err := store.GetRepositories()
		if err != nil {
			r.log.Error().Err(err).Msg("unable to search sub-repositories")

			return imgResultForDigest, err
		}

		partialImgResultForDigest, err = r.getImageListForDigest(subRepoList, digestID)
		if err != nil {
			r.log.Error().Err(err).Msg("unable to get image and tag list for sub-repositories")

			return imgResultForDigest, err
		}

		imgResultForDigest = append(imgResultForDigest, partialImgResultForDigest...)
	}

	return imgResultForDigest, nil
}

func (r *queryResolver) getImageListForDigest(repoList []string,
	digest string) ([]*ImgResultForDigest, error) {
	imgResultForDigest := []*ImgResultForDigest{}

	var errResult error

	for _, repo := range repoList {
		r.log.Info().Str("repo", repo).Msg("filtering list of tags in image repo by digest")

		tags, err := r.digestInfo.GetImageTagsByDigest(repo, digest)
		if err != nil {
			r.log.Error().Err(err).Msg("unable to get filtered list of image tags")

			errResult = err

			continue
		}

		if len(tags) != 0 {
			name := repo

			imgResultForDigest = append(imgResultForDigest, &ImgResultForDigest{Name: &name, Tags: tags})
		}
	}

	return imgResultForDigest, errResult
}

func (r *queryResolver) ImageListWithLatestTag(ctx context.Context) ([]*ImageInfo, error) {
	r.log.Info().Msg("extension api: finding image list")

	imageList := make([]*ImageInfo, 0)

	defaultStore := r.storeController.DefaultStore

	dsImageList, err := r.getImageListWithLatestTag(defaultStore)
	if err != nil {
		r.log.Error().Err(err).Msg("extension api: error extracting default store image list")

		return imageList, err
	}

	if len(dsImageList) != 0 {
		imageList = append(imageList, dsImageList...)
	}

	subStore := r.storeController.SubStore

	for _, store := range subStore {
		ssImageList, err := r.getImageListWithLatestTag(store)
		if err != nil {
			r.log.Error().Err(err).Msg("extension api: error extracting default store image list")

			return imageList, err
		}

		if len(ssImageList) != 0 {
			imageList = append(imageList, ssImageList...)
		}
	}

	return imageList, nil
}

func (r *queryResolver) getImageListWithLatestTag(store storage.ImageStore) ([]*ImageInfo, error) {
	results := make([]*ImageInfo, 0)

	repoList, err := store.GetRepositories()
	if err != nil {
		r.log.Error().Err(err).Msg("extension api: error extracting repositories list")

		return results, err
	}

	if len(repoList) == 0 {
		r.log.Info().Msg("no repositories found")
	}

	layoutUtils := common.NewOciLayoutUtils(r.storeController, r.log)

	for _, repo := range repoList {
		tagsInfo, err := layoutUtils.GetImageTagsWithTimestamp(repo)
		if err != nil {
			r.log.Error().Err(err).Msg("extension api: error getting tag timestamp info")

			return results, err
		}

		if len(tagsInfo) == 0 {
			r.log.Info().Str("no tagsinfo found for repo", repo).Msg(" continuing traversing")

			continue
		}

		latestTag := common.GetLatestTag(tagsInfo)

		digest := godigest.Digest(latestTag.Digest)

		manifest, err := layoutUtils.GetImageBlobManifest(repo, digest)
		if err != nil {
			r.log.Error().Err(err).Msg("extension api: error reading manifest")

			return results, err
		}

		size := strconv.FormatInt(manifest.Config.Size, 10)

		name := repo

		imageConfig, err := layoutUtils.GetImageInfo(repo, manifest.Config.Digest)
		if err != nil {
			r.log.Error().Err(err).Msg("extension api: error reading image config")

			return results, err
		}

		labels := imageConfig.Config.Labels

		// Read Description

		desc := common.GetDescription(labels)

		// Read licenses
		license := common.GetLicense(labels)

		// Read vendor
		vendor := common.GetVendor(labels)

		// Read categories
		categories := common.GetCategories(labels)

		results = append(results, &ImageInfo{
			Name: &name, Latest: &latestTag.Name,
			Description: &desc, Licenses: &license, Vendor: &vendor,
			Labels: &categories, Size: &size, LastUpdated: &latestTag.Timestamp,
		})
	}

	return results, nil
}

func getGraphqlCompatibleTags(fixedTags []common.TagInfo) []*TagInfo {
	finalTagList := make([]*TagInfo, 0)

	for _, tag := range fixedTags {
		fixTag := tag

		finalTagList = append(finalTagList,
			&TagInfo{Name: &fixTag.Name, Digest: &fixTag.Digest, Timestamp: &fixTag.Timestamp})
	}

	return finalTagList
}