let diskConfig = DiskConfig(name: "Floppy")
let memoryConfig = MemoryConfig(expiry: .never, countLimit: 10, totalCostLimit: 10)

let storage = try? Storage(
  diskConfig: diskConfig,
  memoryConfig: memoryConfig,
  transformer: TransformerFactory.forCodable(ofType: User.self) // Storage<String, User>
)

let storage: Storage<String, User> = ...
storage.setObject(superman, forKey: "user")

let imageStorage = storage.transformImage() // Storage<String, UIImage>
imageStorage.setObject(image, forKey: "image")

let stringStorage = storage.transformCodable(ofType: String.self) // Storage<String, String>
stringStorage.setObject("hello world", forKey: "string")

public enum StorageError: Error {
  /// Object can not be found
  case notFound
  /// Object is found, but casting to requested type failed
  case typeNotMatch
  /// The file attributes are malformed
  case malformedFileAttributes
  /// Can't perform Decode
  case decodingFailed
  /// Can't perform Encode
  case encodingFailed
  /// The storage has been deallocated
  case deallocated
  /// Fail to perform transformation to or from Data
  case transformerFail
}

do {
  let storage = try Storage(diskConfig: diskConfig, memoryConfig: memoryConfig)
} catch {
  print(error)
}

let diskConfig = DiskConfig(
  // The name of disk storage, this will be used as folder name within directory
  name: "Floppy",
  // Expiry date that will be applied by default for every added object
  // if it's not overridden in the `setObject(forKey:expiry:)` method
  expiry: .date(Date().addingTimeInterval(2*3600)),
  // Maximum size of the disk cache storage (in bytes)
  maxSize: 10000,
  // Where to store the disk cache. If nil, it is placed in `cachesDirectory` directory.
  directory: try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask,
    appropriateFor: nil, create: true).appendingPathComponent("MyPreferences"),
  // Data protection is used to store files in an encrypted format on disk and to decrypt them on demand
  protectionType: .complete
)

let memoryConfig = MemoryConfig(
  // Expiry date that will be applied by default for every added object
  // if it's not overridden in the `setObject(forKey:expiry:)` method
  expiry: .date(Date().addingTimeInterval(2*60)),
  /// The maximum number of objects in memory the cache should hold
  countLimit: 50,
  /// The maximum total cost that the cache can hold before it starts evicting objects
  totalCostLimit: 0
)

// Save to storage
try? storage.setObject(10, forKey: "score")
try? storage.setObject("Oslo", forKey: "my favorite city", expiry: .never)
try? storage.setObject(["alert", "sounds", "badge"], forKey: "notifications")
try? storage.setObject(data, forKey: "a bunch of bytes")
try? storage.setObject(authorizeURL, forKey: "authorization URL")

// Load from storage
let score = try? storage.object(forKey: "score")
let favoriteCharacter = try? storage.object(forKey: "my favorite city")

// Check if an object exists
let hasFavoriteCharacter = try? storage.objectExists(forKey: "my favorite city")

// Remove an object in storage
try? storage.removeObject(forKey: "my favorite city")

// Remove all objects
try? storage.removeAll()

// Remove expired objects
try? storage.removeExpiredObjects()

let entry = try? storage.entry(forKey: "my favorite city")
print(entry?.object)
print(entry?.expiry)
print(entry?.meta)

struct User: Codable {
  let firstName: String
  let lastName: String
}

let user = User(fistName: "John", lastName: "Snow")
try? storage.setObject(user, forKey: "character")

storage.async.setObject("Oslo", forKey: "my favorite city") { result in
  switch result {
    case .success:
      print("saved successfully")
    case .failure(let error):
      print(error)
  }
}

storage.async.object(forKey: "my favorite city") { result in
  switch result {
    case .success(let city):
      print("my favorite city is \(city)")
    case .failure(let error):
      print(error)
  }
}

storage.async.objectExists(forKey: "my favorite city") { result in
  if case .success(let exists) = result, exists {
    print("I have a favorite city")
  }
}

storage.async.removeAll() { result in
  switch result {
    case .success:
      print("removal completes")
    case .failure(let error):
      print(error)
  }
}

storage.async.removeExpiredObjects() { result in
  switch result {
    case .success:
      print("removal completes")
    case .failure(let error):
      print(error)
  }
}

do {
  try await storage.async.setObject("Oslo", forKey: "my favorite city")
  print("saved successfully")
} catch {
  print(error)
}

do {
  let city = try await storage.async.object(forKey: "my favorite city")
  print("my favorite city is \(city)")
} catch {
  print(error)
}

do {
  let exists = try await storage.async.objectExists(forKey: "my favorite city")
  if exists {
    print("I have a favorite city")
  }
} catch {}

do {
  try await storage.async.remoeAll()
  print("removal completes")
} catch {
  print(error)
}

do {
  try await storage.async.removeExpiredObjects()
  print("removal completes")
} catch {
  print(error)
}

// Default expiry date from configuration will be applied to the item
try? storage.setObject("This is a string", forKey: "string")

// A given expiry date will be applied to the item
try? storage.setObject(
  "This is a string",
  forKey: "string",
  expiry: .date(Date().addingTimeInterval(2 * 3600))
)

// Clear expired objects
storage.removeExpiredObjects()

// Add observer
let token = storage.addStorageObserver(self) { observer, storage, change in
  switch change {
  case .add(let key):
    print("Added \(key)")
  case .remove(let key):
    print("Removed \(key)")
  case .removeAll:
    print("Removed all")
  case .removeExpired:
    print("Removed expired")
  }
}

// Remove observer
token.cancel()

// Remove all observers
storage.removeAllStorageObservers()

let key = "user1"

let token = storage.addObserver(self, forKey: key) { observer, storage, change in
  switch change {
  case .edit(let before, let after):
    print("Changed object for \(key) from \(String(describing: before)) to \(after)")
  case .remove:
    print("Removed \(key)")
  }
}

// Remove observer by token
token.cancel()

// Remove observer for key
storage.removeObserver(forKey: key)

// Remove all observers
storage.removeAllKeyObservers()

let user = JSONDecoder.decode(jsonString, to: User.self)
let cities = JSONDecoder.decode(jsonDictionary, to: [City].self)
let dragons = JSONDecoder.decode(jsonData, to: [Dragon].self)

Alamofire.request("https://gameofthrones.org/mostFavoriteCharacter").responseString { response in
  do {
    let user = try JSONDecoder.decode(response.result.success, to: User.self)
    try storage.setObject(user, forKey: "most favorite character")
  } catch {
    print(error)
  }
}