//
//  TokenEstimator.swift
//  Poche
//
//  Author:  Simon-Pierre Boucher
//  Contact: contact@spboucher.ai
//

import Foundation

/// Conservative token estimation.
///
/// Constraint: the iOS 26 SDK exposes no public token-count API for the
/// on-device model, so the preflight described in CLAUDE.md §2 cannot call
/// `tokenCount(for:)` yet. This estimator deliberately over-counts
/// (~3 characters per token, French text averages closer to 3.5–4) so the
/// budget errs toward condensing early rather than hitting
/// `exceededContextWindowSize`. Replace with the system API the day Apple
/// ships one.
enum TokenEstimator {
    static func tokens(in text: String) -> Int {
        max(1, text.count / 3)
    }

    /// Flat per-tool overhead: name + description + generated argument schema
    /// all live in the context window for the whole session.
    static let perToolOverhead = 120
}