/*

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

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 parameters

import (
	"bytes"
	"errors"
	"text/template"

	corev1 "k8s.io/api/core/v1"
)

func (p *Parameter) GetConfigData() map[string]string {
	if len(p.Value) > 0 && len(p.Key) > 0 {

		data := make(map[string]string)
		data[p.Key] = p.Value
		return data
	}
	return nil
}

func (p *Parameter) DataFromTemplate(values map[string]string) (map[string]string, error) {

	data := make(map[string]string)

	if p.Generate == GenerateTemplate {
		tmpl, err := template.New(p.Key).Parse(p.Value)

		if err != nil {
			return nil, err
		}

		var tpl bytes.Buffer
		err = tmpl.Execute(&tpl, values)

		if err != nil {
			return nil, err
		}

		data[p.Key] = tpl.String()
	}

	return data, nil
}

func (p *Parameter) GetTemplateData() map[string]string {

	return nil
}

func (p *Parameter) GetEnvVar() (envVar corev1.EnvVar, err error) {

	switch p.MountType {
	case MountLiteral:
		if len(p.Value) > 0 && len(p.Key) > 0 {
			envVar := corev1.EnvVar{
				Name:  p.Key,
				Value: p.Value,
			}
			return envVar, nil
		}
		return envVar, errors.New("missing key and/or value argument")

	case MountFrom:
		if len(p.FromKey) > 0 && len(p.Source) > 0 && len(p.Key) > 0 {
			switch p.Type {
			case SecretParameter:
				envVar = corev1.EnvVar{
					Name: p.Key,
					ValueFrom: &corev1.EnvVarSource{
						SecretKeyRef: &corev1.SecretKeySelector{
							LocalObjectReference: corev1.LocalObjectReference{
								Name: p.Source,
							},
							Key: p.FromKey,
						},
					},
				}
				return envVar, nil
			case ConfigParameter:
				envVar = corev1.EnvVar{
					Name: p.Key,
					ValueFrom: &corev1.EnvVarSource{
						ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
							LocalObjectReference: corev1.LocalObjectReference{
								Name: p.Source,
							},
							Key: p.FromKey,
						},
					},
				}
				return envVar, nil
			case ObjectFieldParameter:
				envVar = corev1.EnvVar{
					Name: p.Key,
					ValueFrom: &corev1.EnvVarSource{
						FieldRef: &corev1.ObjectFieldSelector{
							APIVersion: p.Source,
							FieldPath:  p.FromKey,
						},
					},
				}
				return envVar, nil
			}
		}
		return envVar, errors.New("missing arguments")
	default:
		return envVar, errors.New("wrong MountType")
	}
}

func (p *Parameter) GetEnvFrom() (envFrom corev1.EnvFromSource, err error) {
	if len(p.Source) > 0 && p.MountType == MountFrom && p.Type != ObjectFieldParameter {
		if p.Type == ConfigParameter {
			envFrom = corev1.EnvFromSource{
				ConfigMapRef: &corev1.ConfigMapEnvSource{
					LocalObjectReference: corev1.LocalObjectReference{
						Name: p.Source,
					},
				},
			}
			return envFrom, nil
		}
		envFrom = corev1.EnvFromSource{
			SecretRef: &corev1.SecretEnvSource{
				LocalObjectReference: corev1.LocalObjectReference{
					Name: p.Source,
				},
			},
		}
		return envFrom, nil
	}
	return envFrom, errors.New("missing source argument")
}