/*
MIT License

Copyright (c) 2025 lerentis, https://git.uploadfilter24.eu/lerentis


Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

package controller

import (
	"context"
	"encoding/base64"
	"os"

	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/log"

	"github.com/bitwarden/sdk-go"
	lerentisuploadfilter24euv1 "github.com/lerentis/bitwarden-crd-operator/api/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// BitwardenSecretReconciler reconciles a BitwardenSecret object
type BitwardenSecretReconciler struct {
	client.Client
	Scheme *runtime.Scheme
}

// +kubebuilder:rbac:groups=lerentis.uploadfilter24.eu.lerentis.uploadfilter24.eu,resources=bitwardensecrets,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=lerentis.uploadfilter24.eu.lerentis.uploadfilter24.eu,resources=bitwardensecrets/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=lerentis.uploadfilter24.eu.lerentis.uploadfilter24.eu,resources=bitwardensecrets/finalizers,verbs=update

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
// TODO(user): Modify the Reconcile function to compare the state specified by
// the BitwardenSecret object against the actual cluster state, and then
// perform operations to make the cluster state reflect the state specified by
// the user.
//
// For more details, check Reconcile and its Result here:
// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.20.2/pkg/reconcile
func (r *BitwardenSecretReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	olog := log.FromContext(ctx)

	// Fetch the BitwardenSecret instance
	var bitwardenSecret lerentisuploadfilter24euv1.BitwardenSecret
	if err := r.Get(ctx, req.NamespacedName, &bitwardenSecret); err != nil {
		if errors.IsNotFound(err) {
			olog.Info("BitwardenSecret resource not found. Ignoring since object must be deleted.")
			return ctrl.Result{}, nil
		}
		olog.Error(err, "Failed to get BitwardenSecret.")
		return ctrl.Result{}, err
	}

	// Fetch secrets from Bitwarden
	apiURL := os.Getenv("API_URL")
	identityURL := os.Getenv("IDENTITY_URL")

	client, _ := sdk.NewBitwardenClient(&apiURL, &identityURL)

	accessToken := os.Getenv("ACCESS_TOKEN")

	stateFile := os.Getenv("STATE_FILE")

	err := client.AccessTokenLogin(accessToken, &stateFile)
	if err != nil {
		olog.Error(err, "Failed to authenticate with Bitwarden.")
		return ctrl.Result{}, err
	}

	secretData := make(map[string][]byte)
	for _, element := range bitwardenSecret.Spec.Content {
		resp, err := client.Secrets().Get(bitwardenSecret.Spec.ID)
		if err != nil {
			olog.Error(err, "Failed to fetch item from Bitwarden.")
			return ctrl.Result{}, err
		}

		item := resp.Value

		var secretValue string
		switch element.SecretScope {
		case "login":
			if element.SecretName == "username" {
				secretValue = item.Login.Username
			} else if element.SecretName == "password" {
				secretValue = item.Login.Password
			}
		case "fields":
			for _, field := range item.Fields {
				if field.Name == element.SecretName {
					secretValue = field.Value
					break
				}
			}
		case "attachment":
			for _, attachment := range item.Attachments {
				if attachment.FileName == element.SecretName {
					secretValue = attachment.File
					break
				}
			}
		}

		if secretValue != "" {
			secretData[element.SecretRef] = []byte(base64.StdEncoding.EncodeToString([]byte(secretValue)))
		}
	}

	// Create or update Kubernetes secret
	secret := &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name:        bitwardenSecret.Spec.Name,
			Namespace:   bitwardenSecret.Spec.Namespace,
			Labels:      bitwardenSecret.Spec.Labels,
			Annotations: bitwardenSecret.Spec.Annotations,
		},
		Data: secretData,
		Type: corev1.SecretType(bitwardenSecret.Spec.SecretType),
	}

	if err := r.Client.Create(ctx, secret); err != nil && !errors.IsAlreadyExists(err) {
		olog.Error(err, "Failed to create Secret.")
		return ctrl.Result{}, err
	}

	if errors.IsAlreadyExists(err) {
		if err := r.Client.Update(ctx, secret); err != nil {
			olog.Error(err, "Failed to update Secret.")
			return ctrl.Result{}, err
		}
	}

	return ctrl.Result{}, nil
}

// SetupWithManager sets up the controller with the Manager.
func (r *BitwardenSecretReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&lerentisuploadfilter24euv1.BitwardenSecret{}).
		Named("bitwardensecret").
		Complete(r)
}