import AppKit

protocol PostingService: Sendable {
    var account: Account { get }
    func uploadMedia(imageData: Data, filename: String, altText: String?) async throws -> String
    func createPost(text: String, mediaIDs: [String]) async throws -> URL
}

struct PostingError: LocalizedError {
    let message: String
    var errorDescription: String? { message }
}

enum OAuthKeys {
    static let pendingMastodonAccount = "qstatus.pending-mastodon-account"
    static let pendingMastodonError = "qstatus.pending-mastodon-account-error"
}

func mimeTypeForImage(_ filename: String) -> String {
    let ext = (filename as NSString).pathExtension.lowercased()
    switch ext {
    case "png": return "image/png"
    case "gif": return "image/gif"
    case "webp": return "image/webp"
    default: return "image/jpeg"
    }
}