package providers

import (
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"time"

	"git.badhouseplants.net/allanger/shoebill/internal/utils/diff"
	"git.badhouseplants.net/allanger/shoebill/internal/utils/githelper"
	"git.badhouseplants.net/allanger/shoebill/pkg/lockfile"
	"git.badhouseplants.net/allanger/shoebill/pkg/release"
	"git.badhouseplants.net/allanger/shoebill/pkg/repository"
	release_v2beta1 "github.com/fluxcd/helm-controller/api/v2beta1"
	helmrepo_v1beta2 "github.com/fluxcd/source-controller/api/v1beta2"
	"github.com/sirupsen/logrus"
	corev1 "k8s.io/api/core/v1"
	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/yaml"
)

type Flux struct {
	path    string
	sopsBin string
	gh      githelper.Githelper
}

func FluxProvider(path, sopsBin string, gh githelper.Githelper) Provider {
	return &Flux{
		path:    path,
		sopsBin: sopsBin,
		gh:      gh,
	}
}

// TODO: This function is ugly as hell, I need to do something about it
func (f *Flux) SyncState(releasesDiffs diff.ReleasesDiffs, repoDiffs diff.RepositoriesDiffs) (lockfile.HashesPerReleases, error) {
	entity := "repository"
	srcDirPath := fmt.Sprintf("%s/src", f.path)
	// It should containe either release or repository as a prefix, because it's how files are called
	entiryFilePath := fmt.Sprintf("%s/%s-", srcDirPath, entity)

	for _, repository := range repoDiffs {
		switch repository.Action {
		case diff.ACTION_ADD:
			manifest, err := GenerateRepository(repository.Wished)
			if err != nil {
				return nil, err
			}
			file, err := os.Create(entiryFilePath + repository.Wished.Name + ".yaml")
			if err != nil {
				return nil, err
			}
			if _, err := file.Write(manifest); err != nil {
				return nil, err
			}
			message := `chore(repository): Add a repo: %s
		
		A new repo added to the cluster:
		  Name: %s 
		  URL: %s
		`
			if _, err := f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, repository.Wished.Name, repository.Wished.Name, repository.Wished.URL)); err != nil {
				return nil, err
			}

		case diff.ACTION_PRESERVE:
		case diff.ACTION_UPDATE:
			manifest, err := GenerateRepository(repository.Wished)
			if err != nil {
				return nil, err
			}
			if err := os.WriteFile(entiryFilePath+repository.Wished.Name+".yaml", manifest, os.ModeExclusive); err != nil {
				return nil, err
			}
			message := `chore(repository): Update a repo: %s
		
		A repo has been updated:
		  Name: %s 
		  URL: %s
		`
			if _, err := f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, repository.Wished.Name, repository.Wished.Name, repository.Wished.URL)); err != nil {
				return nil, err
			}

		case diff.ACTION_DELETE:
			if err := os.Remove(entiryFilePath + repository.Current.Name + ".yaml"); err != nil {
				return nil, err
			}

			message := `chore(repository): Removed a repo: %s
		A repo has been removed from the cluster:
		  Name: %s 
		  URL: %s
		`
			if _, err := f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, repository.Current.Name, repository.Current.Name, repository.Current.URL)); err != nil {
				return nil, err
			}

		default:
			return nil, fmt.Errorf("unknown action is requests: %s", repository.Action)
		}

	}
	hashesPerReleases := lockfile.HashesPerReleases{}
	entity = "release"
	entiryFilePath = fmt.Sprintf("%s/%s-", srcDirPath, entity)
	for _, release := range releasesDiffs {
		var hash string
		var err error
		if err := SyncValues(release.Current, release.Wished, srcDirPath); err != nil {
			return nil, err
		}

		if err := SyncSecrets(release.Current, release.Wished, f.path, f.sopsBin); err != nil {
			return nil, err
		}

		switch release.Action {
		case diff.ACTION_ADD:
			manifest, err := GenerateRelease(release.Wished)
			if err != nil {
				return nil, err
			}
			file, err := os.Create(entiryFilePath + release.Wished.Release + ".yaml")
			if err != nil {
				return nil, err

			}
			if _, err := file.Write(manifest); err != nil {
				return nil, err
			}
			message := `chore(release): Add a new release: %s
		
		A new release is added to the cluster:
		  Name: %s 
		  Namespace: %s
		  Version: %s
		  Chart: %s/%s
		`
			hash, err = f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, release.Wished.Release, release.Wished.Release, release.Wished.Namespace, release.Wished.Version, release.Wished.Repository, release.Wished.Release))
			if err != nil {
				return nil, err
			}

		case diff.ACTION_UPDATE:
			manifest, err := GenerateRelease(release.Wished)
			if err != nil {
				return nil, err
			}

			if err := os.WriteFile(entiryFilePath+release.Wished.Release+".yaml", manifest, os.ModeExclusive); err != nil {
				return nil, err
			}

			message := `chore(release): Update a release: %s
	
		A release has been updated:
			Name: %s 
			Namespace: %s
			Version: %s
			Chart: %s/%s
		  `
			hash, err = f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, release.Wished.Release, release.Wished.Release, release.Wished.Namespace, release.Wished.Version, release.Wished.Repository, release.Wished.Release))
			if err != nil {
				return nil, err
			}

		case diff.ACTION_DELETE:
			if err := os.Remove(entiryFilePath + release.Current.Release + ".yaml"); err != nil {
				return nil, err
			}
			message := `chore(release): Remove a release: %s
	
			A release has been removed from the cluster:
			Name: %s 
			Namespace: %s
			Version: %s
			Chart: %s/%s
		  `
			hash, err = f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, release.Current.Release, release.Current.Release, release.Current.Namespace, release.Current.Version, release.Current.Repository, release.Current.Release))
			if err != nil {
				return nil, err
			}

		default:
			return nil, fmt.Errorf("unknown action is requests: %s", release.Action)
		}
		if release.Wished != nil {
			hashPerRelease := &lockfile.HashPerRelease{
				Release:    release.Wished.Release,
				Namespace:  release.Wished.Namespace,
				CommitHash: hash,
			}
			hashesPerReleases = append(hashesPerReleases, hashPerRelease)
		}	

	}

	return hashesPerReleases, nil

}

func GenerateRepository(repo *repository.Repository) ([]byte, error) {
	fluxRepo := &helmrepo_v1beta2.HelmRepository{
		TypeMeta: v1.TypeMeta{
			Kind:       helmrepo_v1beta2.HelmRepositoryKind,
			APIVersion: helmrepo_v1beta2.GroupVersion.String(),
		},
		ObjectMeta: v1.ObjectMeta{
			Name:      repo.Name,
			Namespace: "flux-system",
		},
		Spec: helmrepo_v1beta2.HelmRepositorySpec{
			URL:  repo.URL,
			Type: repo.Kind,
			Interval: v1.Duration{
				Duration: time.Minute,
			},
		},
	}
	return yaml.Marshal(&fluxRepo)
}

// GenerateRelease and put
func GenerateRelease(release *release.Release) ([]byte, error) {
	fluxRelease := &release_v2beta1.HelmRelease{
		TypeMeta: v1.TypeMeta{
			Kind:       release_v2beta1.HelmReleaseKind,
			APIVersion: release_v2beta1.GroupVersion.String(),
		},
		ObjectMeta: v1.ObjectMeta{
			Name:      release.Release,
			Namespace: "flux-system",
		},
		Spec: release_v2beta1.HelmReleaseSpec{
			Interval: v1.Duration{
				Duration: time.Minute,
			},
			Chart: release_v2beta1.HelmChartTemplate{
				Spec: release_v2beta1.HelmChartTemplateSpec{
					Chart:   release.Chart,
					Version: release.Version,
					SourceRef: release_v2beta1.CrossNamespaceObjectReference{
						Kind:      helmrepo_v1beta2.HelmRepositoryKind,
						Name:      release.RepositoryObj.Name,
						Namespace: "flux-system",
					},
				},
			},
			ReleaseName: release.Release,
			Install: &release_v2beta1.Install{
				CRDs:            release_v2beta1.Create,
				CreateNamespace: true,
			},
			TargetNamespace: release.Namespace,
			ValuesFrom:      []release_v2beta1.ValuesReference{},
		},
	}
	for _, v := range release.Values {
		filename := fmt.Sprintf("%s-%s-%s", release.Namespace, release.Release, filepath.Base(v))
		fluxRelease.Spec.ValuesFrom = append(fluxRelease.Spec.ValuesFrom, release_v2beta1.ValuesReference{
			Kind:      "ConfigMap",
			Name:      filename,
			ValuesKey: filename,
		})
	}

	for _, v := range release.Secrets {
		filename := fmt.Sprintf("%s-%s-%s", release.Namespace, release.Release, filepath.Base(v))
		fluxRelease.Spec.ValuesFrom = append(fluxRelease.Spec.ValuesFrom, release_v2beta1.ValuesReference{
			Kind:      "Secret",
			Name:      filename,
			ValuesKey: filename,
		})
	}

	return yaml.Marshal(&fluxRelease)
}

func SyncValues(currentRelease, wishedRelease *release.Release, secDirPath string) error {
	valuesDirPath := fmt.Sprintf("%s/values", secDirPath)
	if currentRelease != nil {
		for _, value := range currentRelease.DestValues {
			valuesFilePath := fmt.Sprintf("%s/%s", valuesDirPath, value.DestPath)
			logrus.Infof("trying to remove values file: %s", valuesFilePath)
			if err := os.RemoveAll(valuesFilePath); err != nil {
				return err
			}
		}
	}
	if wishedRelease != nil {
		for _, value := range wishedRelease.DestValues {
			// Prepare a dir for values
			valuesPath := fmt.Sprintf("%s/%s", secDirPath, "values")
			valuesFilePath := fmt.Sprintf("%s/%s", valuesDirPath, value.DestPath)
			logrus.Infof("trying to create values file: %s", valuesFilePath)
			if err := os.MkdirAll(valuesPath, os.ModePerm); err != nil {
				return err
			}
			var valuesFile *os.File
			if _, err := os.Stat(valuesFilePath); err == nil {
				valuesFile, err = os.Open(valuesFilePath)
				if err != nil {
					return err
				}
				defer valuesFile.Close()
			} else if errors.Is(err, os.ErrNotExist) {
				valuesFile, err = os.Create(valuesFilePath)
				if err != nil {
					return nil
				}
				defer valuesFile.Close()
			} else {
				return err
			}

			k8sConfigMapObj := corev1.ConfigMap{
				TypeMeta: v1.TypeMeta{
					Kind:       "ConfigMap",
					APIVersion: "v1",
				},
				ObjectMeta: v1.ObjectMeta{
					Name:      value.DestPath,
					Namespace: "flux-system",
					Labels: map[string]string{
						"shoebill-release": wishedRelease.Release,
						"shoebill-chart":   wishedRelease.Chart,
					},
				},
				Data: map[string]string{
					value.DestPath: string(value.Data),
				},
			}

			valuesFileData, err := yaml.Marshal(k8sConfigMapObj)
			if err != nil {
				return err
			}

			if err := os.WriteFile(valuesFilePath, valuesFileData, os.ModeAppend); err != nil {
				return nil
			}
		}
	}
	return nil
}

func SyncSecrets(currentRelease, wishedRelease *release.Release, workdirPath, sopsBin string) error {
	secretsDirPath := fmt.Sprintf("%s/src/secrets", workdirPath)
	if err := os.MkdirAll(secretsDirPath, os.ModePerm); err != nil {
		return err
	}
	if currentRelease != nil {
		for _, secrets := range currentRelease.DestSecrets {
			secretsFilePath := fmt.Sprintf("%s/%s", secretsDirPath, secrets.DestPath)
			logrus.Infof("trying to remove secrets file: %s", secretsFilePath)
			if err := os.RemoveAll(secretsFilePath); err != nil {
				return err
			}
		}
	}
	if wishedRelease != nil {
		for _, secrets := range wishedRelease.DestSecrets {
			// Prepare a dir for secrets
			secretsFilePath := fmt.Sprintf("%s/%s", secretsDirPath, secrets.DestPath)
			logrus.Infof("trying to create secrets file: %s", secretsFilePath)
			var secretsFile *os.File
			if _, err := os.Stat(secretsFilePath); err == nil {
				secretsFile, err = os.Open(secretsFilePath)
				if err != nil {
					return err
				}
				defer secretsFile.Close()
			} else if errors.Is(err, os.ErrNotExist) {
				secretsFile, err = os.Create(secretsFilePath)
				if err != nil {
					return nil
				}
				defer secretsFile.Close()
			} else {
				return err
			}

			k8sSecretObj := corev1.Secret{
				TypeMeta: v1.TypeMeta{
					Kind:       "Secret",
					APIVersion: "v1",
				},
				ObjectMeta: v1.ObjectMeta{
					Name:      secrets.DestPath,
					Namespace: "flux-system",
					Labels: map[string]string{
						"shoebill-release": wishedRelease.Release,
						"shoebill-chart":   wishedRelease.Chart,
					},
				},
				Data: map[string][]byte{
					secrets.DestPath: secrets.Data,
				},
			}

			secretsFileData, err := yaml.Marshal(k8sSecretObj)
			if err != nil {
				return err
			}

			if err := os.WriteFile(secretsFilePath, secretsFileData, os.ModeAppend); err != nil {
				return nil
			}

			// I have to use the sops binary here, because they do not provide a go package that can be used for encryption :(
			sopsConfPath := fmt.Sprintf("%s/.sops.yaml", workdirPath)
			cmd := exec.Command(sopsBin, "--encrypt", "--in-place", "--config", sopsConfPath, secretsFilePath)
			stderr, err := cmd.StderrPipe()
			if err != nil {
				return err
			}

			if err := cmd.Start(); err != nil {
				return err
			}

			errMsg, _ := io.ReadAll(stderr)
			if err := cmd.Wait(); err != nil {
				err := fmt.Errorf("%s - %s", err, errMsg)
				return err
			}
		}
	}
	return nil
}