//
//  CameraManager.m
//  PanoramicCameraSDK
//
//  Created by 王昭威 on 2023/1/14.
//

#import "CameraManager.h"

@interface CameraManager ()

@property (nonatomic, assign) CGFloat backAspect;

@property (nonatomic, assign) CGFloat frontAspect;

@end

@implementation CameraManager

@synthesize front = _front;
@synthesize back = _back;

- (void)setResolutionFor:(AVCaptureDevicePosition)position with: (NSInteger)desiredWidth{
    
    AVCaptureDevice* device = [self cameraWithPosition:position];
    if(device == nil){
        return;
    }
    
    NSArray *supportedFormats = device.formats;
    
    AVCaptureDeviceFormat *bestFormat;
    CGFloat aspect = 1;
    
//    CMTime maxFrameDuration;
//    float maxSeconds = 15;
    
//    AVFrameRateRange *bestFrameRateRange = nil;//
    
    
    for (AVCaptureDeviceFormat *format in supportedFormats) {
        CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions((CMVideoFormatDescriptionRef)[format formatDescription]);
        //分辨率
        if (dimensions.width <= desiredWidth) {
            if(dimensions.height > 0)
                aspect = (CGFloat)dimensions.width / dimensions.height;
            bestFormat = format;
        }
    }
    
    [device lockForConfiguration:nil];
    [device setActiveFormat:bestFormat];
    
    [device setActiveVideoMaxFrameDuration:CMTimeMake(1, 10)];
    [device setActiveVideoMinFrameDuration:CMTimeMake(1, 10)];
    
    [device unlockForConfiguration];
    
    if(device.position == AVCaptureDevicePositionFront){
        self.frontAspect = aspect;
    }
    else if(device.position == AVCaptureDevicePositionBack){
        self.backAspect = aspect;
    }
}


- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position
{
    NSArray *devices = nil;
    if(@available(iOS 10, *)){
        AVCaptureDeviceDiscoverySession *captureDeviceDiscoverySession = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera]
                                              mediaType:AVMediaTypeVideo
                                               position:position];
        devices = [captureDeviceDiscoverySession devices];
    }
    else if(@available(iOS 4, *)){
        devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    }
    if(devices == nil){
        return nil;
    }
    for (AVCaptureDevice *device in devices)
    {
        if ([device position] == position)
            return device;
    }
    return nil;
}

+ (instancetype)shared{
    static dispatch_once_t token;
    static CameraManager* instance = nil;
    dispatch_once(&token, ^{
        instance = [[self alloc] init];
    });
    
    return instance;
}

- (instancetype)init{
    self = [super init];
    if(self){
        _back = [self cameraWithPosition:AVCaptureDevicePositionBack];
        _front = [self cameraWithPosition:AVCaptureDevicePositionFront];
        
        _frontAspect = 1;
        _backAspect = 1;
    }
    
    return self;
}

- (void)focusOn:(CGPoint)point{
    if (self.back == nil) {
        return;
    }
    [self focusOn:point device:self.back];
}

- (void)focusOn:(CGPoint)point device:(AVCaptureDevice *)device{
    NSError* error;
    [device lockForConfiguration:&error];
    if(error != nil){
        return;
    }
    
    if ([device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]){
        [device setFocusPointOfInterest: point];
        device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
    }
    if ([device isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]) {
        [device setExposurePointOfInterest:point];
        device.exposureMode = AVCaptureExposureModeContinuousAutoExposure;
    }
    [device unlockForConfiguration];
}
//
//
//- (void)configureCamera:(AVCaptureDevice *)device forFrameRate:(int)frameRate {
//    AVCaptureDeviceFormat *bestFormat = nil;
//    AVFrameRateRange *bestFrameRateRange = nil;
//    for ( AVCaptureDeviceFormat *format in [device formats] ) {
//        for ( AVFrameRateRange *range in format.videoSupportedFrameRateRanges ) {
//            //NSLog(@"Format %@",format);
//            if ( range.maxFrameRate == frameRate ) {
//                bestFormat = format;
//                bestFrameRateRange = range;
//            }
//        }
//    }
//
//    //NSLog(@"Format %@",bestFormat);
//
//    if ( bestFormat ) {
//        if ( [device lockForConfiguration:NULL] == YES ) {
//            device.activeFormat = bestFormat;
//            device.activeVideoMinFrameDuration = bestFrameRateRange.minFrameDuration;
//            device.activeVideoMaxFrameDuration = bestFrameRateRange.minFrameDuration;
//            [device unlockForConfiguration];
//        }
//    }
//}
//
//
//- (void)configureCamera{
//    /// 参数设置
//    // 默认后置摄像头
//    AVCaptureDevicePosition position = AVCaptureDevicePositionBack;
//    // 帧率
//    int frameRate = 25;
//    // 显色方案
//    OSType videoFormat = kCVPixelFormatType_32BGRA;
//    // 分辨率高
//    int resolutionHeight = 720;
//
//    /// 创建AVCaptureSession对象
//    AVCaptureSession *session = [[AVCaptureSession alloc] init];
//    /// 设置分辨率
//    session.sessionPreset = AVCaptureSessionPreset1280x720;
//    /// 获取摄像头
//    AVCaptureDevice *captureDevice;
//    // 默认AVCaptureDevicePositionBack，后置摄像头
//    AVCaptureDeviceDiscoverySession *deviceDiscoverySession =  [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera] mediaType:AVMediaTypeVideo position:position];
//    NSArray *devices = deviceDiscoverySession.devices;
//    for (AVCaptureDevice *device in devices) {
//        if (AVCaptureDevicePositionBack == device.position) {
//            captureDevice = device;
//        }else if (AVCaptureDevicePositionFront == device.position){
//            captureDevice = device;
//        }
//    }
//    /// 设置帧率和分辨率高度
//    BOOL isSuccess = NO;
//    for(AVCaptureDeviceFormat *vFormat in [captureDevice formats]) {
//        CMFormatDescriptionRef description = vFormat.formatDescription;
//        float maxRate = ((AVFrameRateRange*) [vFormat.videoSupportedFrameRateRanges objectAtIndex:0]).maxFrameRate;
//        if (maxRate >= frameRate && CMFormatDescriptionGetMediaSubType(description) == videoFormat) {
//            if ([captureDevice lockForConfiguration:NULL] == YES) {
//                // 对比镜头支持的分辨率和当前设置的分辨率
//                CMVideoDimensions dims = CMVideoFormatDescriptionGetDimensions(description);
//                if (dims.height == resolutionHeight && dims.width == [self.class getResolutionWidthByHeight:resolutionHeight]) {
//                    [session beginConfiguration];
//                    if ([captureDevice lockForConfiguration:NULL]){
//                        captureDevice.activeFormat = vFormat;
//                        [captureDevice setActiveVideoMinFrameDuration:CMTimeMake(1, frameRate)];
//                        [captureDevice setActiveVideoMaxFrameDuration:CMTimeMake(1, frameRate)];
//                        [captureDevice unlockForConfiguration];
//                    }
//                    [session commitConfiguration];
//                    isSuccess = YES;
//                }
//            }else {
//                NSLog(@"%s: 失败",__func__);
//            }
//        }
//    }
//
//
//
//
//}
//
/////需要考虑横竖屏情况，这里暂未考虑
//+ (int)getResolutionWidthByHeight:(int)height {
//    switch (height) {
//        case 2160:
//            return 3840;
//        case 1080:
//            return 1920;
//        case 720:
//            return 1280;
//        case 480:
//            return 640;
//        default:
//            return -1;
//    }
//}

@end