//
//  StorageService.swift
//  AutoCatCore
//
//  Created by Selim Mustafaev on 22.06.2024.
//  Copyright © 2024 Selim Mustafaev. All rights reserved.
//

import Foundation
import RealmSwift

public enum StorageError: LocalizedError {
    
    case vehicleNotFound
    case noteNotFound
    
    public var errorDescription: String? {
        switch self {
        case .vehicleNotFound: "Vehicle not found in realm database"
        case .noteNotFound: "Vehicle note not found in realm database"
        }
    }
}

public actor StorageService: StorageServiceProtocol {
    
    private static var instance: StorageService?
    
    public static var shared: StorageService {
        get async throws {
            if let instance {
                return instance
            } else {
                let service = try await StorageService()
                instance = service
                return service
            }
        }
    }
    
    var realm: Realm!
    
    public init(config: Realm.Configuration = .defaultConfiguration) async throws {
        
        realm = try await Realm(configuration: config, actor: self)
    }
    
    public func updateVehicleIfExists(dto: VehicleDto) async throws {
        
        guard realm.object(ofType: Vehicle.self, forPrimaryKey: dto.getNumber()) != nil else {
            return
        }
        
        try await realm.asyncWrite {
            realm.add(Vehicle(dto: dto), update: .all)
        }
    }
}