// LocationPlugin.mm
#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

typedef void (*ResultHandler) (const char *object);
static ResultHandler gHandler;

@interface LocationPlugin : NSObject<CLLocationManagerDelegate>
// 采用CLLocationManagerDelegate协议
{
    CLLocationManager *locationManager;
    bool isReverseGeocoding;            // 是否处于反地理编码处理
}

+ (LocationPlugin *)sharedInstance;

@end

// LocationPlugin类定义
@implementation LocationPlugin

// 单例
static LocationPlugin *sharedInstance = nil;
+ (id)sharedInstance
{
    @synchronized(self)
    {
        if(sharedInstance == nil)
        {
            sharedInstance = [[self alloc] init];
        }
    }
    return sharedInstance;
}

// 开始获取位置信息
- (BOOL)startUpdatingLocation
{
  
    if(locationManager == nil)
    {
        locationManager = [[CLLocationManager alloc] init];
    }

    // 确认位置信息服务是否有效且被许可
    BOOL isEnabledAndAuthorized = NO;
    if([CLLocationManager locationServicesEnabled])
    {
        CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
        if(status == kCLAuthorizationStatusAuthorizedAlways ||
           status == kCLAuthorizationStatusAuthorizedWhenInUse)
        {
            isEnabledAndAuthorized = YES;
        }
    }
    if(!isEnabledAndAuthorized)
    {
        // 位置信息服务无效且未被许可时，请求用户授权
        [locationManager requestWhenInUseAuthorization];
        return NO;
    }
    
    // 开始获取位置信息
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager startUpdatingLocation];

    return YES;
}

// 停止获取位置信息
- (void)stopUpdatingLocation
{
    if(locationManager != nil)
    {
        [locationManager stopUpdatingLocation];
    }
}

#pragma mark - CLLocationManagerDelegate协议的方法实现

// 更新位置信息时调用
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    if(isReverseGeocoding)
    {
        return;
    }
    
    // 基于获取的位置信息进行反地理编码以获取地址
    isReverseGeocoding = YES;
    
    CLLocation *location = [locations lastObject];
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder reverseGeocodeLocation:location
                   completionHandler:^(NSArray *placemarks, NSError *error) {
        isReverseGeocoding = NO;

        // 从CLPlacemark对象的FormattedAddressLines中获取地址的字符串
        NSString *addressString = @"";
        NSString *addressOut = @"";
        if(placemarks.count >= 1)
        {
            CLPlacemark *placemark = [placemarks firstObject];
            NSArray *addressLines =
                [placemark addressDictionary][@"FormattedAddressLines"];
            addressString = [addressLines componentsJoinedByString:@" "];
            addressOut = [NSString stringWithFormat:@"%@\t%@\t%@",placemark.country,placemark.administrativeArea,placemark.locality];
        }

        // 创建作为参数传递的字符串
        NSString *parameter = [NSString stringWithFormat:@"%f\t%f\t%f\t%f\t%@\t%@",
                               location.coordinate.latitude,
                               location.coordinate.longitude,
                               location.speed, location.horizontalAccuracy,
                               addressString,addressOut];
        gHandler (parameter.UTF8String);
    }];
}
//监听权限变化
- (void) locationManagerDidChangeAuthorization:(CLLocationManager *)manager{
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    NSLog(@"locationManagerDidChangeAuthorizatio1:%d",status);
    if (status == kCLAuthorizationStatusAuthorizedAlways
        || status == kCLAuthorizationStatusAuthorizedWhenInUse) {
        NSLog(@"locationManagerDidChangeAuthorizatio2:%@",@"11111");
    }
}

// 其他必须的方法
- (void)locationManager:(CLLocationManager *)manager
      didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region {}

- (void)locationManagerDidPauseLocationUpdates:(CLLocationManager *)manager {}

- (void)locationManagerDidResumeLocationUpdates:(CLLocationManager *)manager {}

@end

#pragma mark - 接口

// 为回避C++命名粉碎，以C linkage进行声明
extern "C" {
    // 用于调用开始获取位置信息方法的接口
    BOOL _startUpdatingLocation(ResultHandler resultHandler)
    {
        gHandler = resultHandler;
        LocationPlugin *instance = [LocationPlugin sharedInstance];
        @synchronized(instance)
        {
            return [instance startUpdatingLocation];
        }
    }

    // 用于调用停止获取位置信息方法的接口
    void _stopUpdatingLocation()
    {
        LocationPlugin *instance = [LocationPlugin sharedInstance];
        @synchronized(instance)
        {
            [instance stopUpdatingLocation];
        }
    }
}