/*
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 kubernetes

import (
	"context"
	"encoding/json"
	"fmt"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	labels "k8s.io/apimachinery/pkg/labels"

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

func (c *Client) GetSecret(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) ([]byte, error) {
	secretMap, err := c.GetSecretMap(ctx, ref)
	if err != nil {
		return nil, err
	}
	if ref.Property != "" {
		val, ok := secretMap[ref.Property]
		if !ok {
			return nil, fmt.Errorf("property %s does not exist in key %s", ref.Property, ref.Key)
		}
		return val, nil
	}
	strMap := make(map[string]string)
	for k, v := range secretMap {
		strMap[k] = string(v)
	}
	jsonStr, err := json.Marshal(strMap)
	if err != nil {
		return nil, fmt.Errorf("unabled to marshal json: %w", err)
	}
	return jsonStr, nil
}

func (c *Client) DeleteSecret(ctx context.Context, remoteRef esv1beta1.PushRemoteRef) error {
	return fmt.Errorf("not implemented")
}

// Not Implemented PushSecret.
func (c *Client) PushSecret(ctx context.Context, value []byte, remoteRef esv1beta1.PushRemoteRef) error {
	return fmt.Errorf("not implemented")
}

func (c *Client) GetSecretMap(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) (map[string][]byte, error) {
	secret, err := c.userSecretClient.Get(ctx, ref.Key, metav1.GetOptions{})
	if apierrors.IsNotFound(err) {
		return nil, esv1beta1.NoSecretError{}
	}
	if err != nil {
		return nil, err
	}
	return secret.Data, nil
}

func (c *Client) GetAllSecrets(ctx context.Context, ref esv1beta1.ExternalSecretFind) (map[string][]byte, error) {
	if ref.Tags != nil {
		return c.findByTags(ctx, ref)
	}
	if ref.Name != nil {
		return c.findByName(ctx, ref)
	}
	return nil, fmt.Errorf("unexpected find operator: %#v", ref)
}

func (c *Client) findByTags(ctx context.Context, ref esv1beta1.ExternalSecretFind) (map[string][]byte, error) {
	// empty/nil tags = everything
	sel, err := labels.ValidatedSelectorFromSet(ref.Tags)
	if err != nil {
		return nil, fmt.Errorf("unable to validate selector tags: %w", err)
	}
	secrets, err := c.userSecretClient.List(ctx, metav1.ListOptions{LabelSelector: sel.String()})
	if err != nil {
		return nil, fmt.Errorf("unable to list secrets: %w", err)
	}
	data := make(map[string][]byte)
	for _, secret := range secrets.Items {
		jsonStr, err := json.Marshal(convertMap(secret.Data))
		if err != nil {
			return nil, err
		}
		data[secret.Name] = jsonStr
	}
	return utils.ConvertKeys(ref.ConversionStrategy, data)
}

func (c *Client) findByName(ctx context.Context, ref esv1beta1.ExternalSecretFind) (map[string][]byte, error) {
	secrets, err := c.userSecretClient.List(ctx, metav1.ListOptions{})
	if err != nil {
		return nil, fmt.Errorf("unable to list secrets: %w", err)
	}
	matcher, err := find.New(*ref.Name)
	if err != nil {
		return nil, err
	}
	data := make(map[string][]byte)
	for _, secret := range secrets.Items {
		if !matcher.MatchName(secret.Name) {
			continue
		}
		jsonStr, err := json.Marshal(convertMap(secret.Data))
		if err != nil {
			return nil, err
		}
		data[secret.Name] = jsonStr
	}
	return utils.ConvertKeys(ref.ConversionStrategy, data)
}

func (c Client) Close(ctx context.Context) error {
	return nil
}

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