/*

Licensed under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.gnu.org/licenses/agpl-3.0.html

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package settings

import (
	"crypto/sha1"
	"fmt"
	"io"
	"sort"
	"strings"

	"k8s.libre.sh/controller-utils/application/settings/parameters"
	"k8s.libre.sh/controller-utils/meta"
	"k8s.libre.sh/controller-utils/objects"
)

const (
	// Generate settings as env variables in a configMap or Secret
	GenEnvFile SettingsGenerate = "envFile"
)

const (
	// Generate settings as env variables in a configMap or Secret
	SecretSettings SettingsType = "secret"
)

type SettingsGenerate string
type SettingsType string

// +kubebuilder:object:generate=true
type Settings struct {
	CreateOptions *CreateOptions `json:"createOptions,omitempty"`
	*SettingsSpec `json:",inline"`
}

// +kubebuilder:object:generate=true
type CreateOptions struct {
	CommonMeta   *meta.ObjectMeta `json:"commonMeta,omitempty"`
	SecretMeta   *meta.ObjectMeta `json:"secretMeta,omitempty"`
	ConfigMeta   *meta.ObjectMeta `json:"configMeta,omitempty"`
	Generate     SettingsGenerate `json:"generate,omitempty"`
	SettingsType SettingsType     `json:"type,omitempty"`
}

// NewSettings returns a Settings struct
func NewSettings(co *CreateOptions, srcs *Sources, ps *parameters.Parameters) *Settings {
	return &Settings{
		CreateOptions: co,
		SettingsSpec: &SettingsSpec{
			Sources:    srcs,
			Parameters: ps,
		},
	}
}

func (opts *CreateOptions) Init() {
	if opts.CommonMeta == nil {
		opts.CommonMeta = &meta.ObjectMeta{}
	}

	if opts.CommonMeta.Labels == nil {
		opts.CommonMeta.Labels = make(map[string]string)
	}

	if opts.SecretMeta == nil {
		opts.SecretMeta = &meta.ObjectMeta{}
	}

	if opts.SecretMeta.Labels == nil {
		opts.SecretMeta.Labels = make(map[string]string)
	}

	if opts.ConfigMeta == nil {
		opts.ConfigMeta = &meta.ObjectMeta{}
	}

	if opts.ConfigMeta.Labels == nil {
		opts.SecretMeta.Labels = make(map[string]string)
	}

}

// GetCreateOptions return the CreateOptions
func (s *Settings) GetCreateOptions() *CreateOptions { return s.CreateOptions }

// GetConfig return the SettingsSpec
func (s *Settings) GetConfig() Config { return s.SettingsSpec }

// GetMeta return the  meta.Instance interface
func (s *Settings) GetMeta() meta.Instance { return s.CreateOptions.CommonMeta }

// GetCreateOptions return the CreateOptions
func (s *Settings) GetObjects() map[int]objects.Object { return GetObjects(s) }

// SetDefaults sets the defaults from the create options
func (s *Settings) SetDefaults() {

	srcs := &Sources{}

	secretSrc := Source{
		Ref:  s.GetCreateOptions().SecretMeta.GetName(),
		Type: "secret",
	}
	configSrc := Source{
		Ref:  s.GetCreateOptions().ConfigMeta.GetName(),
		Type: "configmap",
	}

	// Reset sources, we do not want to mount orginal resources
	if s.GetCreateOptions().Generate == GenEnvFile {
		srcs = &Sources{}
	}

	for _, p := range *s.GetParameters() {

		// TODO IMPROVE

		if p.MountType == parameters.MountEnvFile || (p.MountType != parameters.MountFile && s.GetCreateOptions().Generate == GenEnvFile) {
			if p.Type != parameters.ObjectFieldParameter || p.RefType != parameters.ObjectFieldParameter {
				p.MountType = parameters.MountEnvFile
				// add newly created resource ref to sources
				if p.Type == parameters.ConfigParameter {
					srcs = AppendSourceIfUnique(srcs, configSrc)
				} else if p.Type == parameters.SecretParameter || p.Type == "" {
					srcs = AppendSourceIfUnique(srcs, secretSrc)
				}
			}
		}

		if p.Type != parameters.ObjectFieldParameter || p.RefType != parameters.ObjectFieldParameter {
			if s.GetCreateOptions().SettingsType == "configmap" {
				p.Type = parameters.ConfigParameter
			} else if s.GetCreateOptions().SettingsType == "secret" {
				p.Type = parameters.SecretParameter
			}
		}

		if p.MountType == parameters.MountFile && len(p.Ref) == 0 {
			if p.Type == parameters.ConfigParameter {
				p.Ref = s.GetCreateOptions().ConfigMeta.GetName()

			}
			if p.Type == parameters.SecretParameter {
				p.Ref = s.GetCreateOptions().SecretMeta.GetName()

			}
		}

	}

	srcs.DeepCopyInto(s.GetSources())

	shaParam := &parameters.Parameter{
		Key:       s.GetMeta().GetComponent(),
		Value:     GetSHAfromParameters(s.GetParameters()),
		MountType: parameters.MountLiteral,
	}

	for _, p := range *s.GetParameters() {
		if p.Key == s.GetMeta().GetComponent() {
			p = shaParam
			return
		}
	}

	*s.GetParameters() = append(*s.GetParameters(), shaParam)

}

// Init initialise the settings.
// ObjectMeta are set from commons meta.
// Parameters are initialised from external resources set in ValueFrom and random values are generated.
/* func (s *Settings) Init(c client.Client, owner interfaces.Object, scheme *runtime.Scheme) error {

	if s.CreateOptions == nil {
		s.CreateOptions = &CreateOptions{}
	}
	s.CreateOptions.Init()

	meta.SetObjectMeta(s.CreateOptions.CommonMeta, s.CreateOptions.ConfigMeta)
	meta.SetObjectMeta(s.CreateOptions.CommonMeta, s.CreateOptions.SecretMeta)

	err := InitParametersValueFrom(s, c, owner, scheme)

	if err != nil {
		return err
	}

	s.InitRandValues()

	return nil
}
*/

func GetSHAfromParameters(params *parameters.Parameters) string {
	values := []string{}
	for _, p := range *params {
		if len(p.Key) > 0 && len(p.Value) > 0 {
			values = append(values, p.Key+"="+p.Value)
		}
	}

	sort.Strings(values)

	return GenerateSHA(strings.Join(values, ";"))
}

// GenerateSHA generates SHA from string
func GenerateSHA(data string) string {
	hasher := sha1.New()
	_, err := io.WriteString(hasher, data)
	if err != nil {
		//	logrus.Errorf("Unable to write data in hash writer %v", err)
	}
	sha := hasher.Sum(nil)
	return fmt.Sprintf("%x", sha)
}