import Flutter
import UIKit

@main
@objc class AppDelegate: FlutterAppDelegate {

    private let channelName = "com.payfrit.app/beacon"
    private var beaconScanner: BeaconScanner?

    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        GeneratedPluginRegistrant.register(with: self)

        // Set up beacon scanner method channel
        guard let controller = window?.rootViewController as? FlutterViewController else {
            return super.application(application, didFinishLaunchingWithOptions: launchOptions)
        }

        beaconScanner = BeaconScanner()

        let channel = FlutterMethodChannel(name: channelName, binaryMessenger: controller.binaryMessenger)

        channel.setMethodCallHandler { [weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) in
            guard let self = self, let scanner = self.beaconScanner else {
                result(FlutterError(code: "UNAVAILABLE", message: "Beacon scanner not initialized", details: nil))
                return
            }

            switch call.method {
            case "hasPermissions":
                result(scanner.hasPermissions())

            case "isBluetoothEnabled":
                result(scanner.isBluetoothEnabled())

            case "startScan":
                var regions: [String] = []
                if let args = call.arguments as? [String: Any],
                   let regionList = args["regions"] as? [String] {
                    regions = regionList
                }

                scanner.startScan(regions: regions) { beacons in
                    result(beacons)
                } onError: { error in
                    result(FlutterError(code: "SCAN_ERROR", message: error, details: nil))
                }

            case "stopScan":
                scanner.stopScan()
                result(nil)

            default:
                result(FlutterMethodNotImplemented)
            }
        }

        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
}