// Namespace for talking to Claude through a gated Backend-for-Frontend Worker.
//
// EXAMPLE CODE. Placeholders only, point baseURL at your own Worker.
// Requires Xcode 27 / OS 27 betas and the ClaudeForFoundationModels package.
//
// A caseless enum is Swift's idiomatic namespace: it groups the static members
// across these files and cannot be instantiated (unlike a struct, which can).
// One concern per file: entitlement, App Attest, headers, and errors each live
// in their own extension.

import Foundation
import FoundationModels
import ClaudeForFoundationModels

enum ClaudeBFF {
    /// The BFF endpoint host. The Foundation Models client appends the Messages
    /// path, so the Worker sees "/v1/messages", the one upstream path it allows.
    static let baseURL = URL(string: "https://bff.example.com")!

    /// Headers the BFF reads each credential from.
    static let transactionHeader = "X-IAP-Transaction"
    static let assertionHeader = "X-App-Attest-Assertion"
    static let keyIdHeader = "X-App-Attest-Key-Id"

    /// Convenience: gather credentials, build a session, and respond.
    static func respond(to prompt: String) async throws -> String {
        let session = LanguageModelSession(model: try await model())
        let response = try await session.respond(to: prompt)
        return response.content
    }
}