Use and configure deep links in emails and SMS deeplinks

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    func scene(_ scene: UIScene,
              continue userActivity: NSUserActivity) {
        guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
              let incomingURL = userActivity.webpageURL else {
            return
        }

        handleUniversalLink(url: incomingURL)
    }

    private func handleUniversalLink(url: URL) {
        // Only handle AJO tracked mobile clicks
        guard url.host == "data.email.mybusiness.com",
              url.path.hasPrefix("/ee/v1/mclick") else {
            // Could also handle direct www.mybusiness.com links here
            return
        }

        resolveTrackedUrlAndRoute(url)
    }

    private func resolveTrackedUrlAndRoute(_ trackedUrl: URL) {
        var request = URLRequest(url: trackedUrl)
        request.httpMethod = "GET"

        URLSession.shared.dataTask(with: request) { _, response, error in
            guard error == nil,
                  let httpResponse = response as? HTTPURLResponse,
                  let locationValue = httpResponse.allHeaderFields["Location"] as? String,
                  let finalUrl = URL(string: locationValue) else {
                return
            }

            DispatchQueue.main.async {
                self.routeToDestination(finalUrl)
            }
        }.resume()
    }

    private func routeToDestination(_ url: URL) {
        // Example: map URL paths to screens
        // https://www.mybusiness.com/dashboard/offers/coupons
        // → OffersViewController for Coupons
    }
}

class DeepLinkActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val trackedUri = intent?.data
        if (trackedUri == null ||
            trackedUri.host != "data.email.mybusiness.com" ||
            !trackedUri.path.orEmpty().startsWith("/ee/v1/mclick")) {
            finish()
            return
        }

        resolveTrackedUrlAndRoute(trackedUri)
    }

    private fun resolveTrackedUrlAndRoute(trackedUri: Uri) {
        lifecycleScope.launch(Dispatchers.IO) {
            try {
                val finalUrl = followRedirect(trackedUri.toString())
                withContext(Dispatchers.Main) {
                    routeToDestination(finalUrl)
                    finish()
                }
            } catch (e: Exception) {
                // Optionally log error, fallback to browser
                finish()
            }
        }
    }

    private fun followRedirect(trackedUrl: String): Uri {
        val client = OkHttpClient.Builder()
            .followRedirects(false) // We want to read Location ourselves
            .build()

        val request = Request.Builder()
            .url(trackedUrl)
            .get()
            .build()

        client.newCall(request).execute().use { response ->
            val location = response.header("Location")
                ?: throw IllegalStateException("Missing Location header")
            return Uri.parse(location)
        }
    }

    private fun routeToDestination(finalUri: Uri) {
        // Example: interpret https://www.mybusiness.com/dashboard/offers/coupons
        // and open the correct Activity / Fragment
    }
}