payfrit-beacon-ios/PayfritBeacon/Utils/UUIDFormatting.swift

import Foundation

extension String {

    /// Strip dashes, uppercase: "e2c56db5-..." → "E2C56DB5..."
    var normalizedUUID: String {
        replacingOccurrences(of: "-", with: "").uppercased()
    }

    /// Format 32 hex chars → standard UUID (8-4-4-4-12)
    var uuidWithDashes: String {
        let clean = normalizedUUID
        guard clean.count == 32 else { return self }
        let c = Array(clean)
        return "\(String(c[0..<8]))-\(String(c[8..<12]))-\(String(c[12..<16]))-\(String(c[16..<20]))-\(String(c[20..<32]))"
    }

    /// Convert hex string to byte array
    var hexToBytes: [UInt8] {
        let clean = normalizedUUID
        var bytes: [UInt8] = []
        var i = clean.startIndex
        while i < clean.endIndex {
            let next = clean.index(i, offsetBy: 2, limitedBy: clean.endIndex) ?? clean.endIndex
            if let byte = UInt8(clean[i..<next], radix: 16) {
                bytes.append(byte)
            }
            i = next
        }
        return bytes
    }
}