//
//  KeychainHelper.swift
//  BlueWallet
//
//  Created by Marcos Rodriguez on 11/20/24.
//  Copyright © 2024 BlueWallet. All rights reserved.
//


import Foundation
import Security

class KeychainHelper {
    
    static let shared = KeychainHelper()
    
    private init() {}
    
    /// Save data to Keychain
    func save(_ data: Data, service: String, account: String) -> Bool {
        // Create query
        let query: [String: Any] = [
            kSecClass as String       : kSecClassGenericPassword,
            kSecAttrService as String : service,
            kSecAttrAccount as String : account,
            kSecValueData as String   : data
        ]
        
        // Delete any existing item
        SecItemDelete(query as CFDictionary)
        
        // Add new item
        let status = SecItemAdd(query as CFDictionary, nil)
        return status == errSecSuccess
    }
    
    /// Retrieve data from Keychain
    func retrieve(service: String, account: String) -> Data? {
        // Create query
        let query: [String: Any] = [
            kSecClass as String       : kSecClassGenericPassword,
            kSecAttrService as String : service,
            kSecAttrAccount as String : account,
            kSecReturnData as String  : true,
            kSecMatchLimit as String  : kSecMatchLimitOne
        ]
        
        var dataTypeRef: AnyObject?
        let status = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
        
        if status == errSecSuccess {
            return dataTypeRef as? Data
        } else {
            return nil
        }
    }
    
    /// Delete data from Keychain
    func delete(service: String, account: String) -> Bool {
        // Create query
        let query: [String: Any] = [
            kSecClass as String       : kSecClassGenericPassword,
            kSecAttrService as String : service,
            kSecAttrAccount as String : account
        ]
        
        let status = SecItemDelete(query as CFDictionary)
        return status == errSecSuccess
    }
}