// Copyright (c) 2026 Alibaba Group and its affiliates

// 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 sdk

import (
	"encoding/base64"
	"fmt"

	"github.com/dashscope/dashscope-confidential-maas/pkg/utils"
)

// encryptContent encrypts content with session key and returns base64-encoded ciphertext
func encryptContent(content string, sessionKey []byte) (string, error) {
	encrypted, err := utils.EncryptWithAESGCM([]byte(content), sessionKey)
	if err != nil {
		return "", fmt.Errorf("failed to encrypt content: %w", err)
	}

	return base64.StdEncoding.EncodeToString(encrypted), nil
}

// decryptContent decrypts base64-encoded ciphertext with session key
func decryptContent(encryptedB64 string, sessionKey []byte) (string, error) {
	encrypted, err := base64.StdEncoding.DecodeString(encryptedB64)
	if err != nil {
		return "", fmt.Errorf("failed to decode base64: %w", err)
	}

	decrypted, err := utils.DecryptWithAESGCM(encrypted, sessionKey)
	if err != nil {
		return "", fmt.Errorf("failed to decrypt content: %w", err)
	}

	return string(decrypted), nil
}
