import AppKit
import Sparkle

func log(_ message: String) {
    FileHandle.standardError.write(Data((message + "\n").utf8))
}

@MainActor
final class Driver: NSObject, SPUUserDriver {
    func show(_ request: SPUUpdatePermissionRequest, reply: @escaping (SUUpdatePermissionResponse) -> Void) {
        reply(SUUpdatePermissionResponse(automaticUpdateChecks: true, sendSystemProfile: false))
    }

    func showUserInitiatedUpdateCheck(cancellation: @escaping () -> Void) {}

    func showUpdateFound(with appcastItem: SUAppcastItem, state: SPUUserUpdateState, reply: @escaping (SPUUserUpdateChoice) -> Void) {
        log("installing \(appcastItem.displayVersionString) (\(appcastItem.versionString))")
        reply(.install)
    }

    func showUpdateReleaseNotes(with downloadData: SPUDownloadData) {}

    func showUpdateReleaseNotesFailedToDownloadWithError(_ error: any Error) {}

    func showUpdateNotFoundWithError(_ error: any Error, acknowledgement: @escaping () -> Void) {
        log("no update: \(error.localizedDescription)")
        exit(0)
    }

    func showUpdaterError(_ error: any Error, acknowledgement: @escaping () -> Void) {
        log("update failed: \(error.localizedDescription)")
        exit(1)
    }

    func showDownloadInitiated(cancellation: @escaping () -> Void) {}

    func showDownloadDidReceiveExpectedContentLength(_ expectedContentLength: UInt64) {}

    func showDownloadDidReceiveData(ofLength length: UInt64) {}

    func showDownloadDidStartExtractingUpdate() {}

    func showExtractionReceivedProgress(_ progress: Double) {}

    func showReady(toInstallAndRelaunch reply: @escaping (SPUUserUpdateChoice) -> Void) {
        reply(.install)
    }

    func showInstallingUpdate(withApplicationTerminated applicationTerminated: Bool, retryTerminatingApplication: @escaping () -> Void) {
        log("installing")
    }

    func showUpdateInstalledAndRelaunched(_ relaunched: Bool, acknowledgement: @escaping () -> Void) {
        log("installed")
        exit(0)
    }

    func dismissUpdateInstallation() {
        exit(0)
    }
}

let app = Bundle.main.executableURL!.resolvingSymlinksInPath().deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent()
if NSWorkspace.shared.runningApplications.contains(where: { $0.bundleURL?.standardizedFileURL == app.standardizedFileURL }) {
    log("\(app.path) is running; its own updater handles updates")
    exit(0)
}
let bundle = Bundle(url: app)!
let driver = Driver()
let updater = SPUUpdater(hostBundle: bundle, applicationBundle: bundle, userDriver: driver, delegate: nil)
do {
    try updater.start()
} catch {
    log("start updater: \(error.localizedDescription)")
    exit(1)
}
updater.checkForUpdates()
RunLoop.main.run()