/*
Copyright © The ESO Authors

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

    https://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 akeyless

import (
	"context"
	"errors"
	"fmt"

	"github.com/external-secrets/external-secrets/runtime/esutils/resolvers"
)

const (
	errFetchAccessIDSecret        = "could not fetch accessID secret: %w"
	errFetchAccessTypeSecret      = "could not fetch AccessType secret: %w"
	errFetchAccessTypeParamSecret = "could not fetch AccessTypeParam secret: %w"
	errMissingSAK                 = "missing SecretAccessKey"
	errMissingAKID                = "missing AccessKeyID"
	errMissingAccessTypeParam     = "missing AccessTypeParam for Akeyless access key auth"
)

func (a *akeylessBase) TokenFromSecretRef(ctx context.Context) (string, error) {
	prov, err := GetAKeylessProvider(a.store)
	if err != nil {
		return "", err
	}

	if prov.Auth.KubernetesAuth != nil {
		auth := prov.Auth.KubernetesAuth
		return a.GetToken(ctx, auth.AccessID, "k8s", auth.K8sConfName, prov.Auth)
	}

	accessID, err := resolvers.SecretKeyRef(
		ctx,
		a.kube,
		a.storeKind,
		a.namespace,
		&prov.Auth.SecretRef.AccessID,
	)
	if err != nil {
		return "", fmt.Errorf(errFetchAccessIDSecret, err)
	}
	accessType, err := resolvers.SecretKeyRef(
		ctx,
		a.kube,
		a.storeKind,
		a.namespace,
		&prov.Auth.SecretRef.AccessType,
	)
	if err != nil {
		return "", fmt.Errorf(errFetchAccessTypeSecret, err)
	}

	var accessTypeParam string
	if prov.Auth.SecretRef.AccessTypeParam.Name != "" {
		accessTypeParam, err = resolvers.SecretKeyRef(
			ctx,
			a.kube,
			a.storeKind,
			a.namespace,
			&prov.Auth.SecretRef.AccessTypeParam,
		)
		if err != nil {
			return "", fmt.Errorf(errFetchAccessTypeParamSecret, err)
		}
	}

	if accessID == "" {
		return "", errors.New(errMissingSAK)
	}
	if accessType == "" {
		return "", errors.New(errMissingAKID)
	}
	if (accessType == "api_key" || accessType == "access_key") && accessTypeParam == "" {
		return "", errors.New(errMissingAccessTypeParam)
	}

	return a.GetToken(ctx, accessID, accessType, accessTypeParam, prov.Auth)
}
