import { CLLocationManager, CLAuthorizationStatus } from "CoreLocation"
import { TencentLBSLocationManager, TencentLBSLocation, Error, TencentLBSRequestLevel, TencentLBSLocationManagerDelegate} from "TencentLBS"
import Bundle from "Foundation"


/**
 * 定位请求参数封装
 */
type LocationOptions = {
	geocode: boolean,
	success: (response: LocationResponse) => void,
	fail: (msg: string) => void
};

/**
 * 定位返回结果封装
 */
type LocationResponse = {
	name: string,
	address: string,
	latitude: number,
	longitude: number
}

/**
 * 定位 LBSLocation 类，封装定位相关方法
 */
class LBSLocation implements TencentLBSLocationManagerDelegate {
	
	// 定义 locationManager 属性，类型为 TencentLBSLocationManager
	locationManager: TencentLBSLocationManager
	
	locationOptions?: LocationOptions
	
	// 初始化 locationManager 方法
	configLocationManager(): boolean {
		
		if (this.locationManager == null) {
			// 从 info.plist 中读取 apiKey
			const apiKey = Bundle.main.infoDictionary?.["TencentLBSAPIKey"]
			// infoDictionary 获取的值类型为 any？
			if (apiKey == null) { 
				// 如果 apiKey 为 null 返回 false
				console.log("apiKey 未配置")
			    return false
			}
			// 调用API前需要设置同意用户隐私协议
			TencentLBSLocationManager.setUserAgreePrivacy(true)
			// 初始化 locationManager 实例对象
			this.locationManager = new TencentLBSLocationManager() 
			// 设置 apiKey （因为 apiKey 是 any？类型，需要转成 string 类型赋值）
			this.locationManager.apiKey = apiKey! as string;
			this.locationManager.delegate = this
		}
		
		return true
	}
	
	// 请求定位权限
	requestPremission() {
		if (this.configLocationManager()) {
			const status = CLLocationManager.authorizationStatus()
			// 如果未获取过定位权限，则发起权限请求
			if (status == CLAuthorizationStatus.notDetermined) {
				this.locationManager.requestWhenInUseAuthorization()
			}
		}
	}
	
	// 获取单次位置信息
	getLocation(locationOptions: LocationOptions): boolean {
		
		// 初始化 locationManager 
		if (!this.configLocationManager()) {
			// 初始化失败返回 false
			return false
		}
		
		// 是否需要返回逆地理编码
		let requestLevel = TencentLBSRequestLevel.geo
		if (locationOptions.geocode) {
			requestLevel = TencentLBSRequestLevel.name
		}
		
		// 请求单次定位信息
		this.locationManager.requestLocation(with = requestLevel, locationTimeout = 10, completionBlock = (location?: TencentLBSLocation, err?: Error): void => {
			if (location != null) {
			    let response = new LocationResponse();
			    response.name = location!.name;
			    response.address = location!.address;
			    response.latitude = Number(location!.location.coordinate.latitude);
			    response.longitude = Number(location!.location.coordinate.longitude);
				locationOptions.success(response);
			} else {
				locationOptions.fail(err!.localizedDescription)
			}
		})
		
		return true
	}
	
	// 监听位置变化
	watchPosition(locationOptions: LocationOptions) {
		// 初始化 locationManager
		if (!this.configLocationManager()) {
			return
		}
		if (locationOptions.geocode) {
			this.locationManager.requestLevel = TencentLBSRequestLevel.name
		} else {
			this.locationManager.requestLevel = TencentLBSRequestLevel.geo
		}
		this.locationOptions = locationOptions
		this.locationManager.startUpdatingLocation()
	}
	
	// 清除监听
	clearWatch() {
		// 初始化 locationManager
		if (!this.configLocationManager()) {
			return
		}
		this.locationManager.stopUpdatingLocation()
	}
	
	// 实现定位出错的 delegate 方法
	tencentLBSLocationManager(manager: TencentLBSLocationManager, error: Error) {
		this.locationOptions?.fail(error.localizedDescription)
	}
	
	// 实现位置更新的 delegate 方法
	tencentLBSLocationManager(manager: TencentLBSLocationManager, @argumentLabel("didUpdate") location: TencentLBSLocation) {
		let response = new LocationResponse();
		response.name = location.name;
		response.address = location.address;
		response.latitude = Number(location.location.coordinate.latitude);
		response.longitude = Number(location.location.coordinate.longitude);
		this.locationOptions?.success(response)
	}
	
}

const LBSLocationTool: LBSLocation = new LBSLocation()

/**
 * 请求定位权限方法
 */
export function requestPremission() {
	LBSLocationTool.requestPremission()
}

/*
 * 获取位置信息方法（单次定位）
 */
export function getLocation(locationOptions: LocationOptions): boolean {
	return LBSLocationTool.getLocation(locationOptions)
}

/**
 * 持续监听位置变化
 */
export function watchPosition(locationOptions: LocationOptions) {
	LBSLocationTool.watchPosition(locationOptions)
}

/**
 * 关闭监听位置变化
 */
export function clearWatch() {
	LBSLocationTool.clearWatch()
}