package release

import (
	"crypto/sha1"
	"encoding/base64"
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"strings"

	"git.badhouseplants.net/allanger/shoebill/internal/utils/helmhelper"
	"git.badhouseplants.net/allanger/shoebill/internal/utils/sopshelper"
	"git.badhouseplants.net/allanger/shoebill/pkg/lockfile"
	"git.badhouseplants.net/allanger/shoebill/pkg/repository"
	"github.com/sirupsen/logrus"
)

type Release struct {
	// Public fields, that can be set with yaml
	Repository string
	// Release name
	Release string `yaml:"name"`
	// Chart name
	Chart string
	// Chart version
	Version string
	// Namespace to install release
	Namespace string
	// Value files
	Values []string
	// Secrets SOPS encrypted
	Secrets []string
	// Private fields that should be pupulated during the run-time
	RepositoryObj *repository.Repository `yaml:"-"`
	DestValues    ValuesHolders          `yaml:"-"`
	DestSecrets   ValuesHolders          `yaml:"-"`
}

func (r *Release) ToHelmReleaseData() *helmhelper.ReleaseData {
	// valuesData =
	// for _, data := range r.DestValues {

	// }
	return &helmhelper.ReleaseData{
		Name:           r.Release,
		Chart:          r.Chart,
		Version:        r.Version,
		Namespace:      r.Namespace,
		RepositoryName: r.RepositoryObj.Name,
		RepositoryURL:  r.RepositoryObj.URL,
		RepositoryKind: r.RepositoryObj.Kind,
	}
}

type ValuesHolder struct {
	SrcPath  string
	DestPath string
	Data     []byte
}

type ValuesHolders []ValuesHolder

func (vhs ValuesHolders) ToStrings() []string {
	values := []string{}
	for _, vh := range vhs {
		values = append(values, vh.DestPath)
	}
	return values
}

type Releases []*Release

// RepositoryObjFromName gather the whole repository object by its name
func (r *Release) RepositoryObjFromName(repos repository.Repositories) error {
	for _, repo := range repos {
		if repo.Name == r.Repository {
			r.RepositoryObj = repo
		}
	}
	if r.RepositoryObj == nil {
		return fmt.Errorf("couldn't gather the RepositoryObj for %s", r.Repository)
	}
	return nil
}

// Possible version placeholders
const (
	VERSION_LATEST = "latest"
)

// Replace the version placeholder with the fixed version
func (r *Release) VersionHandler(dir string, hh helmhelper.Helmhelper) error {
	if len(r.Version) == 0 {
		r.Version = VERSION_LATEST
	}
	switch r.Version {
	case VERSION_LATEST:
		version, err := hh.FindLatestVersion(dir, r.ToHelmReleaseData())
		if err != nil {
			return err
		}
		logrus.Info(version)
		r.Version = version

	}
	return nil
}

func (r *Release) ValuesHandler(dir string) error {
	for i := range r.Values {
		r.Values[i] = fmt.Sprintf("%s/%s", dir, strings.ReplaceAll(r.Values[i], "./", ""))
		destValues := fmt.Sprintf("%s-%s-%s", r.Namespace, r.Release, filepath.Base(r.Values[i]))
		valuesData, err := os.ReadFile(r.Values[i])
		if err != nil {
			return err
		}
		r.DestValues = append(r.DestValues, ValuesHolder{
			SrcPath:  r.Values[i],
			DestPath: destValues,
			Data:     valuesData,
		})
	}
	return nil
}

func (r *Release) SecretsHandler(dir string, sops sopshelper.SopsHelper) error {
	for i := range r.Secrets {
		path := fmt.Sprintf("%s/%s", dir, strings.ReplaceAll(r.Secrets[i], "./", ""))
		res, err := sops.Decrypt(path)
		if err != nil {
			return err
		}
		destSecrets := fmt.Sprintf("%s-%s-%s", r.Namespace, r.Release, filepath.Base(r.Secrets[i]))
		r.DestSecrets = append(r.DestSecrets, ValuesHolder{
			SrcPath:  path,
			DestPath: destSecrets,
			Data:     res,
		})
	}
	return nil
}

func FindReleaseByNames(releases []string, releasesObj Releases) Releases {
	result := Releases{}

	for _, repoObj := range releasesObj {
		for _, release := range releases {
			if repoObj.Release == release {
				result = append(result, repoObj)
			}
		}
	}

	return result
}

// Helpers
func ReleasesFromLockfile(lockfile lockfile.LockFile, repos repository.Repositories) (Releases, error) {
	releases := Releases{}
	for _, releaseLocked := range lockfile {
		release := &Release{
			Repository: releaseLocked.RepoName,
			Release:    releaseLocked.Release,
			Chart:      releaseLocked.Chart,
			Version:    releaseLocked.Version,
			Namespace:  releaseLocked.Namespace,
			RepositoryObj: &repository.Repository{
				Name: releaseLocked.RepoName,
				URL:  releaseLocked.RepoUrl,
			},
		}
		if err := release.RepositoryObj.ValidateURL(); err != nil {
			return nil, err
		}
		if err := release.RepositoryObj.KindFromUrl(); err != nil {
			return nil, err
		}
		releases = append(releases, release)
	}
	return releases, nil
}

func (r *Release) LockEntry() *lockfile.LockEntry {
	valuesHashes := map[string]string{}
	for _, valueHolder := range r.DestValues {
		hasher := sha1.New()
		hasher.Write(valueHolder.Data)
		sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
		valuesHashes[valueHolder.DestPath] = sha
	}
	secretHashes := map[string]string{}
	for _, valueHolder := range r.DestSecrets {
		hasher := sha1.New()
		hasher.Write(valueHolder.Data)
		sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
		secretHashes[valueHolder.DestPath] = sha
	}
	return &lockfile.LockEntry{
		Chart:     r.Chart,
		Release:   r.Release,
		Version:   r.Version,
		Namespace: r.Namespace,
		RepoUrl:   r.RepositoryObj.URL,
		RepoName:  r.RepositoryObj.Name,
		Values:    valuesHashes,
		Secrets:   secretHashes,
	}
}

type Diff struct {
	Added   Releases
	Deleted Releases
	Updated Releases
}

// TODO(@allanger): Naming should be better
func (src Releases) Diff(dest Releases) Diff {
	diff := Diff{}
	for _, rSrc := range src {
		found := false
		for _, rDest := range dest {
			logrus.Infof("comparing %s to %s", rSrc.Release, rDest.Release)
			if rSrc.Release == rDest.Release {
				found = true
				if reflect.DeepEqual(rSrc, rDest) {
					continue
				} else {
					diff.Updated = append(diff.Updated, rDest)
				}
			}
		}
		if !found {
			diff.Deleted = append(diff.Added, rSrc)
		}
	}

	for _, rDest := range dest {
		found := false
		for _, rSrc := range src {
			if rSrc.Release == rDest.Release {
				found = true
				continue
			}
		}
		if !found {
			diff.Added = append(diff.Added, rDest)
		}
	}
	return diff
}

func (rs *Releases) PopulateRepositories(repos repository.Repositories) error {
	for _, r := range *rs {
		if err := r.RepositoryObjFromName(repos); err != nil {
			return err
		}
	}
	return nil
}