import Foundation

enum BackupError: LocalizedError {
    case connectionFailed(String)
    case authenticationFailed
    case photoLibraryDenied
    case uploadFailed(String, underlying: Error)
    case directoryListFailed(String)
    case directoryCreateFailed(String)
    case cancelled
    case timeout
    case networkUnavailable

    var errorDescription: String? {
        switch self {
        case .connectionFailed(let host):   return "Could not connect to \(host)"
        case .authenticationFailed:         return "Authentication failed — check username and password"
        case .photoLibraryDenied:           return "Photos access denied — update in iOS Settings"
        case .uploadFailed(let file, _):    return "Failed to upload \(file)"
        case .directoryListFailed(let path):return "Could not list \(path)"
        case .directoryCreateFailed(let p): return "Could not create folder at \(p)"
        case .cancelled:                    return "Backup was cancelled"
        case .timeout:                      return "Operation timed out"
        case .networkUnavailable:           return "Network not available"
        }
    }
}