/*
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 fake

import (
	"context"
	"fmt"

	"sigs.k8s.io/controller-runtime/pkg/client"

	esv1beta1 "github.com/external-secrets/external-secrets/apis/externalsecrets/v1beta1"
)

var (
	errMissingStore        = fmt.Errorf("missing store provider")
	errMissingFakeProvider = fmt.Errorf("missing store provider fake")
	errMissingKeyField     = "key must be set in data %v"
	errMissingValueField   = "at least one of value or valueMap must be set in data %v"
)

type Provider struct {
	config *esv1beta1.FakeProvider
}

func (p *Provider) NewClient(ctx context.Context, store esv1beta1.GenericStore, kube client.Client, namespace string) (esv1beta1.SecretsClient, error) {
	cfg, err := getProvider(store)
	if err != nil {
		return nil, err
	}
	return &Provider{
		config: cfg,
	}, nil
}

func getProvider(store esv1beta1.GenericStore) (*esv1beta1.FakeProvider, error) {
	if store == nil {
		return nil, errMissingStore
	}
	spc := store.GetSpec()
	if spc == nil || spc.Provider == nil || spc.Provider.Fake == nil {
		return nil, errMissingFakeProvider
	}
	return spc.Provider.Fake, nil
}

// Empty GetAllSecrets.
func (p *Provider) GetAllSecrets(ctx context.Context, ref esv1beta1.ExternalSecretFind) (map[string][]byte, error) {
	// TO be implemented
	return nil, fmt.Errorf("GetAllSecrets not implemented")
}

// GetSecret returns a single secret from the provider.
func (p *Provider) GetSecret(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) ([]byte, error) {
	for _, data := range p.config.Data {
		if data.Key == ref.Key && data.Version == ref.Version {
			return []byte(data.Value), nil
		}
	}
	return nil, esv1beta1.NoSecretErr
}

// GetSecretMap returns multiple k/v pairs from the provider.
func (p *Provider) GetSecretMap(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) (map[string][]byte, error) {
	for _, data := range p.config.Data {
		if data.Key != ref.Key || data.Version != ref.Version || data.ValueMap == nil {
			continue
		}
		return convertMap(data.ValueMap), nil
	}
	return nil, esv1beta1.NoSecretErr
}

func convertMap(in map[string]string) map[string][]byte {
	m := make(map[string][]byte)
	for k, v := range in {
		m[k] = []byte(v)
	}
	return m
}

func (p *Provider) Close(ctx context.Context) error {
	return nil
}

func (p *Provider) Validate() (esv1beta1.ValidationResult, error) {
	return esv1beta1.ValidationResultReady, nil
}

func (p *Provider) ValidateStore(store esv1beta1.GenericStore) error {
	prov := store.GetSpec().Provider.Fake
	if prov == nil {
		return nil
	}
	for pos, data := range prov.Data {
		if data.Key == "" {
			return fmt.Errorf(errMissingKeyField, pos)
		}
		if data.Value == "" && data.ValueMap == nil {
			return fmt.Errorf(errMissingValueField, pos)
		}
	}
	return nil
}

func init() {
	esv1beta1.Register(&Provider{}, &esv1beta1.SecretStoreProvider{
		Fake: &esv1beta1.FakeProvider{},
	})
}