//
//  OrderLocationProvider.swift
//  suixinkan
//

import CoreLocation

/// 一次性定位，用于多点位核销拉取打卡点。
final class OrderLocationProvider: NSObject, CLLocationManagerDelegate {
    private let manager = CLLocationManager()
    private var continuation: ((Result<CLLocationCoordinate2D, Error>) -> Void)?

    override init() {
        super.init()
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
    }

    func requestCoordinate() async throws -> CLLocationCoordinate2D {
        let status = manager.authorizationStatus
        if status == .notDetermined {
            manager.requestWhenInUseAuthorization()
        }
        guard status == .authorizedWhenInUse || status == .authorizedAlways || manager.authorizationStatus == .authorizedWhenInUse else {
            throw OrderLocationError.permissionDenied
        }
        return try await withCheckedThrowingContinuation { continuation in
            self.continuation = { result in
                continuation.resume(with: result)
            }
            manager.requestLocation()
        }
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last else { return }
        continuation?(.success(location.coordinate))
        continuation = nil
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        continuation?(.failure(error))
        continuation = nil
    }
}

enum OrderLocationError: LocalizedError {
    case permissionDenied

    var errorDescription: String? {
        switch self {
        case .permissionDenied: "缺少定位权限，功能无法进行"
        }
    }
}