#import "RNScreenshotcatch.h"
#import <React/RCTConvert.h>
#import <React/RCTEventDispatcher.h>

#define PATH @"screen-shot-catch"

@implementation RNScreenshotcatch

RCT_EXPORT_MODULE()

- (NSArray <NSString *> *)supportedEvents{
  return @[@"Screenshotcatch"];
}

RCT_EXPORT_METHOD(startListener){
  [self addScreenShotObserver];
}

RCT_EXPORT_METHOD(stopListener){
  [self removeScreenShotObserver];
}

- (void)addScreenShotObserver{
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getScreenShot:) name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

- (void)removeScreenShotObserver{
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

- (void)getScreenShot:(NSNotification *)notification{
  [self sendEventWithName:@"Screenshotcatch" body:[self screenImage]];
}

// 保存文件并返回文件路径
- (NSDictionary *)screenImage{
  @try{
    UIImage *image = [UIImage imageWithData: [self imageDataScreenShot]];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *path =[[paths objectAtIndex:0]stringByAppendingPathComponent:PATH];
    if (![fileManager fileExistsAtPath:path]) {
      [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    }
    long time = (long)[[NSDate new] timeIntervalSince1970];
    NSString *filePath = [path stringByAppendingPathComponent: [NSString stringWithFormat:@"screen-shot-catch-%ld.png", time]];

    @try{
      BOOL result = [UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES]; // 保存成功会返回YES
      if (result == YES) {
        NSLog(@"%@ 保存成功。filePath：%@", PATH, filePath);
        [[[UIApplication sharedApplication] keyWindow] endEditing:YES]; // 获取截屏后关闭键盘
        return @{@"code": @200, @"uri": filePath};
      }
    }@catch(NSException *ex) {
      NSLog(@"%@ 保存图片失败：%@", PATH, ex.description);
      filePath = @"";
      return @{@"code": @500, @"errMsg": @"保存图片失败"};
    }
  }@catch(NSException *ex) {
    NSLog(@"%@ 截屏失败：%@", PATH, ex.description);
    return @{@"code": @500, @"errMsg": @"截屏失败"};
  }
}

// 截屏
- (NSData *)imageDataScreenShot{
  CGSize imageSize = [UIScreen mainScreen].bounds.size;
  
  UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
  CGContextRef context = UIGraphicsGetCurrentContext();
  for(UIWindow *window in [[UIApplication sharedApplication] windows]){
    CGContextSaveGState(context);
    CGContextTranslateCTM(context, window.center.x, window.center.y);
    CGContextConcatCTM(context, window.transform);
    CGContextTranslateCTM(context, -window.bounds.size.width*window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
    if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]){
      NSLog(@"agan_app 使用drawViewHierarchyInRect:afterScreenUpdates:");
      [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
    }else{
      NSLog(@"agan_app 使用renderInContext:");
      [window.layer renderInContext:context];
    }
    CGContextRestoreGState(context);
  }
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  
  return UIImagePNGRepresentation(image);
}

@end