#import <AVFoundation/AVFoundation.h>
#import <UIKit/UIKit.h>

extern "C" {

    /// 启用连续自动对焦和自动曝光
    void _EnableContinuousAutoFocus()
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
            if (!device) return;

            NSError *error = nil;

            // 锁定设备开始配置
            if ([device lockForConfiguration:&error]) {

                // 连续自动对焦模式（持续调整，适合扫描二维码）
                if ([device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]) {
                    device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
                }

                // 连续自动曝光
                if ([device isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]) {
                    device.exposureMode = AVCaptureExposureModeContinuousAutoExposure;
                }

                // 对焦范围限制为近距（适合二维码）
                if ([device respondsToSelector:@selector(setAutoFocusRangeRestriction:)]) {
                    if ([device isAutoFocusRangeRestrictionSupported]) {
                        device.autoFocusRangeRestriction = AVCaptureAutoFocusRangeRestrictionNear;
                    }
                }

                [device unlockForConfiguration];

                NSLog(@"[CameraFocusHelper] 已启用连续自动对焦");
            } else {
                NSLog(@"[CameraFocusHelper] 锁定设备失败: %@", error.localizedDescription);
            }
        });
    }

    /// 触发一次自动对焦（用于手动点按时调用）
    void _TriggerAutoFocus()
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
            if (!device) return;

            NSError *error = nil;
            if ([device lockForConfiguration:&error]) {
                if ([device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
                    device.focusMode = AVCaptureFocusModeAutoFocus;
                }
                if ([device isExposureModeSupported:AVCaptureExposureModeAutoExpose]) {
                    device.exposureMode = AVCaptureExposureModeAutoExpose;
                }
                [device unlockForConfiguration];
            }
        });
    }

}