package providers

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

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

type Flux struct {
	path string
	gh   githelper.Githelper
}

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

func (f *Flux) SyncState(diff diff.Diff) error {
	entity := "repository"
	srcPath := fmt.Sprintf("%s/src", f.path)
	filePath := fmt.Sprintf("%s/%s-", srcPath, entity)

	for _, repo := range diff.DeletedRepositories {
		if err := os.Remove(filePath + repo.Name + ".yaml"); err != nil {
			return 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, repo.Name, repo.Name, repo.URL)); err != nil {
			return err
		}
	}

	for _, repo := range diff.UpdatedRepositories {
		manifest, err := GenerateRepository(repo)
		if err != nil {
			return err
		}
		if err := os.WriteFile(filePath+repo.Name+".yaml", manifest, os.ModeExclusive); err != nil {
			return 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, repo.Name, repo.Name, repo.URL)); err != nil {
			return err
		}
	}
	for _, repo := range diff.AddedRepositories {
		manifest, err := GenerateRepository(repo)
		if err != nil {
			return err
		}
		file, err := os.Create(filePath + repo.Name + ".yaml")
		if err != nil {
			return err
		}
		if _, err := file.Write(manifest); err != nil {
			return 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, repo.Name, repo.Name, repo.URL)); err != nil {
			return err
		}

	}

	entity = "release"
	filePath = fmt.Sprintf("%s/%s-", srcPath, entity)

	for _, release := range diff.AddedReleases {
		if err := SyncValues(release, srcPath); err != nil {
			return err
		}
		manifest, err := GenerateRelease(release)
		if err != nil {
			return err
		}
		file, err := os.Create(filePath + release.Release + ".yaml")
		if err != nil {
			return err

		}
		if _, err := file.Write(manifest); err != nil {
			return 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
	`
		if err := f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, release.Release, release.Release, release.Namespace, release.Version, release.Repository, release.Release)); err != nil {
			return err
		}

	}

	for _, release := range diff.UpdatedReleases {
		SyncValues(release, srcPath)
		manifest, err := GenerateRelease(release)
		if err != nil {
			return err
		}

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

		message := `chore(release): Update a release: %s

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

	}

	for _, release := range diff.DeletedReleases {
		if err := os.Remove(filePath + release.Release + ".yaml"); err != nil {
			return 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
	  `
		if err := f.gh.AddAllAndCommit(f.path, fmt.Sprintf(message, release.Release, release.Release, release.Namespace, release.Version, release.Repository, release.Release)); err != nil {
			return err
		}

	}

	return 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-namespace",
		},
		Spec: helmrepo_v1beta2.HelmRepositorySpec{
			URL:  repo.URL,
			Type: repo.Kind,
		},
	}
	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-namespace",
		},
		Spec: release_v2beta1.HelmReleaseSpec{
			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-namespace",
					},
				},
			},
			ReleaseName: release.Release,
			Install: &release_v2beta1.Install{
				CRDs:            release_v2beta1.Create,
				CreateNamespace: true,
			},
			TargetNamespace: "release-namespace",
		},
	}
	return yaml.Marshal(&fluxRelease)
}

func SyncValues(release *release.Release, path string) error {
	for _, valueFile := range release.Values {
		// Prepare a dir for values
		valuesPath := fmt.Sprintf("%s/%s", path, "values")
		if _, err := os.Stat(valuesPath); errors.Is(err, os.ErrNotExist) {
			err := os.Mkdir(valuesPath, os.ModePerm)
			if err != nil {
				return err
			}
		} else if err != nil {
			return err
		}

		destFileName := fmt.Sprintf("%s/%s-%s", valuesPath, release.Release, filepath.Base(valueFile))
		logrus.Info(destFileName)
		logrus.Info(valueFile)
		var dstValues *os.File
		var srcValues *os.File
		var err error
		srcValues, err = os.Open(valueFile)
		if err != nil {
			return err
		}
		defer srcValues.Close()
		if _, err = os.Stat(destFileName); err == nil {
			dstValues, err = os.Open(destFileName)
			if err != nil {
				return err
			}
			defer dstValues.Close()
		} else if errors.Is(err, os.ErrNotExist) {
			dstValues, err = os.Create(destFileName)
			if err != nil {
				return nil
			}
			defer dstValues.Close()
		} else {
			return err
		}
		_, err = io.Copy(dstValues, srcValues)
		if err != nil {
			return err
		}
	}
	return nil
}