import Foundation
import CoreGraphics

/// Maps a measured round-trip time (ms) to a radial distance from downtown.
/// A log curve so the busy near range (1–50ms LAN/CDN) spreads out instead of
/// bunching at the center, while the long tail (transcontinental) saturates.
public enum LatencyLayout {
    public static let minRadius: CGFloat = 150
    public static let maxRadius: CGFloat = 560
    public static let rttCeiling: Double = 250   // ms mapped to the outer edge

    public static func radius(forRTT rtt: Double) -> CGFloat {
        let clamped = max(0, min(rtt, rttCeiling))
        let norm = log10(1 + clamped) / log10(1 + rttCeiling)
        return minRadius + CGFloat(norm) * (maxRadius - minRadius)
    }
}