ios/Shared/MusicActivityAttributes.swift

import ActivityKit
import Foundation

struct MusicActivityAttributes: ActivityAttributes {
    struct ContentState: Codable, Hashable {
        var title: String
        var artist: String
        var playing: Bool
        var position: Double
        var duration: Double
        var updatedAt: Date
        var connected: Bool
        var message: String? = nil

        // Bound UTF-8, including pathological combining characters, below ActivityKit's 4 KB limit.
        static func bounded(_ text: String) -> String {
            var result = ""
            for scalar in text.unicodeScalars {
                guard result.utf8.count + scalar.utf8.count <= 256 else { break }
                result.unicodeScalars.append(scalar)
            }
            return result
        }

        var progress: Double { duration > 0 ? min(1, max(0, position / duration)) : 0 }
    }
}