dependencies: [
  .package(url: "https://github.com/CleanCocoa/TrialLicensing.git", .upToNextMajor(from: Version(3, 0, 0))),
]

import TrialLicense

let publicKey = [
        "-----BEGIN DSA PUBLIC KEY-----\n",
        // ...
        "-----END DSA PUBLIC KEY-----\n"
    ].join("")
let configuration = LicenseConfiguration(appName: "AmazingApp!", publicKey: publicKey)

class MyApp: AppLicensingDelegate {

    init() {

        AppLicensing.setUp(
            configuration: configuration,
            initialTrialDuration: Days(30),

            // Set up the callbacks:
            licenseChangeBlock: self.licenseDidChange(licenseInfo:),
            invalidLicenseInformationBlock: self.didEnterInvalidLicenseCode(name:licenseCode:),

            // Get notified about initial state to unlock the app immediately:
            fireInitialState: true)
    }

    func licenseDidChange(licenseInformation: LicenseInformation) {

        switch licenseInformation {
        case .onTrial(_):
            // Changing back to trial may be possible if you support unregistering
            // form the app (and the trial period is still good.)
            return

        case .registered(_):
            // For example:
            //   displayThankYouAlert()
            //   unlockApp()

        case .trialUp:
            // For example:
            //   displayTrialUpAlert()
            //   lockApp()
            //   showRegisterApp()
        }
    }

    func didEnterInvalidLicenseCode(name: String, licenseCode: String) {

        // For example:
        //   displayInvalidLicenseAlert()
        // -- or show an error label in the license window.
    }
}

let myApp = MyApp()

enum LicenseInformation {
    case registered(License)
    case onTrial(TrialPeriod)
    case trialUp
}

struct License {
    let name: String
    let licenseCode: String
}

struct TrialPeriod {
    let startDate: Date
    let endDate: Date
}