//
//  LocationService.swift
//  ylgamehall
//
//  高德 AMapLocationManager 异步包装：一次性 / 持续两种模式。
//  契约 §3.2 ［6］ getlocationinfo 9 字段；msext gameController.m:2491-2557 等价。
//
//  ⚠️ canImport(AMapLocationKit) 守卫：SDK 未链接时 LocationService 永远抛
//  LocationError.sdkNotLinked，handler 兜底退化为 stub 行为。
//

import Foundation
import CoreLocation
import os.log

/// 定位诊断日志（文件级 let，Logger 是 Sendable，便于在 AMap 回调闭包内直接用）。
private let locLog = Logger(subsystem: "ylgamehall", category: "Location")

#if canImport(AMapLocationKit)
import AMapLocationKit
#endif
#if canImport(AMapFoundationKit)
import AMapFoundationKit
#endif

/// 9 字段定位结果。字段名严格 1:1 H5 端契约（contract §3.2 表 [6]）：
///   - latitude / longitude **是 string** (`String(format: "%f", ...)`)
///   - province **小写 p**（与 sharelogin.Province 大写不同）
public struct LocationPayload: Sendable {
    public let address:   String
    public let city:      String
    public let cityCode:  String
    public let country:   String
    public let district:  String
    public let latitude:  String
    public let longitude: String
    public let province:  String
    public let street:    String
}

public enum LocationError: Error, Sendable {
    case sdkNotLinked
    case authorizationDenied
    case timeout
    case underlying(any Error)
}

@MainActor
public final class LocationService {

    public static let shared = LocationService()

    public init() {}

    #if canImport(AMapLocationKit)
    private let manager: AMapLocationManager = {
        let m = AMapLocationManager()
        m.desiredAccuracy = kCLLocationAccuracyHundredMeters
        m.locationTimeout = 6
        m.reGeocodeTimeout = 3
        m.locatingWithReGeocode = true
        return m
    }()
    #endif

    /// 诊断用：requestOnce 调用序号，日志里可对上「谁发起、谁回来」。
    private var requestSeq: UInt64 = 0

    /// 一次性定位 + 逆地理（msext locAction + completionBlock 等价）
    public func requestOnce(caller: String = "?") async throws -> LocationPayload {
        #if canImport(AMapLocationKit)
        requestSeq += 1
        let seq = requestSeq
        locLog.debug("[\(caller, privacy: .public)] requestOnce #\(seq, privacy: .public) 发起（shared manager id=\(String(describing: ObjectIdentifier(self.manager)), privacy: .public)）")
        return try await withCheckedThrowingContinuation { (cont: CheckedContinuation<LocationPayload, Error>) in
            let accepted = manager.requestLocation(withReGeocode: true) { loc, regeo, err in
                locLog.debug("[\(caller, privacy: .public)] requestOnce #\(seq, privacy: .public) completionBlock 回来：loc=\(loc != nil, privacy: .public) regeo=\(regeo != nil, privacy: .public) err=\(err?.localizedDescription ?? "nil", privacy: .public)")
                if let err = err as NSError? {
                    // msext 行为：权限相关错误归一到 12 errorCode（handler 转字段）
                    if err.code == AMapLocationErrorCode.locateFailed.rawValue {
                        cont.resume(throwing: LocationError.authorizationDenied)
                    } else {
                        cont.resume(throwing: LocationError.underlying(err))
                    }
                    return
                }
                guard let loc, let regeo else {
                    cont.resume(throwing: LocationError.timeout)
                    return
                }
                cont.resume(returning: LocationPayload(
                    address:   regeo.formattedAddress ?? "",
                    city:      regeo.city             ?? "",
                    cityCode:  regeo.citycode         ?? "",
                    country:   regeo.country          ?? "",
                    district:  regeo.district         ?? "",
                    latitude:  String(format: "%f", loc.coordinate.latitude),
                    longitude: String(format: "%f", loc.coordinate.longitude),
                    province:  regeo.province         ?? "",
                    street:    regeo.street           ?? ""
                ))
            }
            // ⚠️ AMapLocationManager.h：「是否成功添加单次定位Request」。返回 NO 时
            // completionBlock 永远不会被调用 → continuation 永挂 → H5 收不到任何
            // getlocationinfo（连 errorCode 12 都没有）。诊断阶段先只记录。
            locLog.debug("[\(caller, privacy: .public)] requestOnce #\(seq, privacy: .public) requestLocation 返回 accepted=\(accepted, privacy: .public)")
        }
        #else
        locLog.error("[\(caller, privacy: .public)] requestOnce: AMapLocationKit 未链接，抛 sdkNotLinked")
        throw LocationError.sdkNotLinked
        #endif
    }

    /// 停止：msext gameController.m:2473-2478 cleanUpAction 等价
    public func stop(caller: String = "?") {
        #if canImport(AMapLocationKit)
        // ⚠️ AMapLocationManager.h：stopUpdatingLocation「会 cancel 掉所有的单次定位请求」。
        // 本类是 shared 单例、manager 唯一，因此这里会连带取消**其它容器**在飞的单次定位。
        locLog.debug("[\(caller, privacy: .public)] stop()：stopUpdatingLocation + delegate=nil（会取消所有在飞的单次定位）")
        manager.stopUpdatingLocation()
        manager.delegate = nil
        #endif
    }
}