import Foundation

enum PlatformLabelFormatter {
    static func parse(_ raw: String) -> (prefix: String, version: String?) {
        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
        if trimmed.isEmpty { return ("", nil) }
        let parts = trimmed.split(whereSeparator: { $0 == " " || $0 == "\t" }).map(String.init)
        let prefix = parts.first?.lowercased() ?? ""
        let versionToken = parts.dropFirst().first
        return (prefix, versionToken)
    }

    static func pretty(_ raw: String) -> String? {
        let (prefix, version) = self.parse(raw)
        if prefix.isEmpty { return nil }
        let name: String = switch prefix {
        case "macos": "macOS"
        case "ios": "iOS"
        case "ipados": "iPadOS"
        case "tvos": "tvOS"
        case "watchos": "watchOS"
        default: prefix.prefix(1).uppercased() + prefix.dropFirst()
        }
        guard let version, !version.isEmpty else { return name }
        let parts = version.split(separator: ".").map(String.init)
        if parts.count >= 2 {
            return "\(name) \(parts[0]).\(parts[1])"
        }
        return "\(name) \(version)"
    }
}