import Foundation

enum Constants {
    static let version = "0.8.2"
    static let maxMessageBytes = 65536
    static let maxImageBytes = 5 * 1024 * 1024      // 5 MB
    static let maxFileBytes = 50 * 1024 * 1024       // 50 MB
    static let imageChunkSize = 32768                 // 32 KB
    static let selfDeviceId = "00000000-0000-0000-0000-000000000000"

    static let opkReplenishThreshold = 20
    static let opkBatchSize = 50
    static let spkRotationDays = 7

    static let maxSkip = 256
    static let maxSenderKeySkip = 256

    static let deviceBundleCacheTTL: TimeInterval = 300  // 5 minutes
    static let sendReceiveTimeout: TimeInterval = 30
    static let reconnectBaseDelay: TimeInterval = 1
    static let reconnectMaxDelay: TimeInterval = 30

    static let pbkdf2Iterations: UInt32 = 600_000
    static let ecp1Magic = Data([0x45, 0x43, 0x50, 0x31])  // "ECP1"

    // HKDF info/salt strings matching Python
    static let x3dhInfo = "EncryptedChat_X3DH"
    static let rootKeyInfo = "EncryptedChat_RootKey"
    static let selfEncryptionSalt = "self_encryption"
    static let selfEncryptionInfo = "EncryptedChat_SelfKey"
    static let localStorageSalt = "local_storage"
    static let localStorageInfo = "EncryptedChat_LocalStorage"
    static let senderKeyChainInfo = "SenderKeyChain"

    // Server connection defaults
    static let defaultHost = "127.0.0.1"
    static let defaultPort: UInt16 = 9999
}