//
//  CusomeCameraViewController.m
//  CollectionViewTest
//
//  Created by imac on 17/2/17.
//  Copyright © 2017年 xiang. All rights reserved.
//

#import "CusomeCameraViewController.h"
#define kScreenBounds   [UIScreen mainScreen].bounds
#define kScreenWidth  kScreenBounds.size.width*1.0
#define kScreenHeight kScreenBounds.size.height*1.0
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface CusomeCameraViewController ()<AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate>

//捕获设备，通常是前置摄像头，后置摄像头，麦克风（音频输入）
@property(nonatomic)AVCaptureDevice *device;

//AVCaptureDeviceInput 代表输入设备，他使用AVCaptureDevice 来初始化
@property(nonatomic)AVCaptureDeviceInput *input;

//当启动摄像头开始捕获输入
@property(nonatomic)AVCaptureMetadataOutput *output;

@property (nonatomic)AVCaptureStillImageOutput *ImageOutPut;

//session：由他把输入输出结合在一起，并开始启动捕获设备（摄像头）
@property(nonatomic)AVCaptureSession *session;

//图像预览层，实时显示捕获的图像
@property(nonatomic)AVCaptureVideoPreviewLayer *previewLayer;

@property (nonatomic)UIButton *PhotoButton;
@property (nonatomic)UIButton *flashButton;
@property (nonatomic)UIImageView *imageView;
@property (nonatomic)UIView *focusView;
@property (nonatomic)BOOL isflashOn;
@property (nonatomic)UIImage *image;
@property (nonatomic)UIImage *cutedImage;
@property (nonatomic)BOOL canCa;
@property(nonatomic,strong) UIButton *leftButton;
@property(nonatomic,strong) UIButton *rightButton;
@property(nonatomic,strong) UIButton *reMakeButton;
@property(nonatomic,strong) UIButton *userButton;

@end

@implementation CusomeCameraViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    _canCa = [self canUserCamear];
    if (_canCa) {
        [self customCamera];
        [self customUI];
        
    }else{
        return;
    }

}

- (void)customUI{
    _PhotoButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _PhotoButton.frame = CGRectMake(kScreenWidth*1/2.0-30, kScreenHeight-100, 60, 60);
    [_PhotoButton setImage:[UIImage imageNamed:@"photograph"] forState: UIControlStateNormal];
    [_PhotoButton setImage:[UIImage imageNamed:@"photograph_Select"] forState:UIControlStateNormal];
    [_PhotoButton addTarget:self action:@selector(shutterCamera) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_PhotoButton];
    
    _focusView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 80, 80)];
    _focusView.layer.borderWidth = 1.0;
    _focusView.layer.borderColor =[UIColor greenColor].CGColor;
    _focusView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:_focusView];
    _focusView.hidden = YES;
    
    self.leftButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _leftButton.frame = CGRectMake(kScreenWidth*1/2.0-30 - 20 - 60, kScreenHeight-100, 60, 60);
    [_leftButton setTitle:@"取消" forState:UIControlStateNormal];
    _leftButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_leftButton addTarget:self action:@selector(cancle:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_leftButton];
    
    
    self.rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightButton.frame = CGRectMake(CGRectGetMaxX(_PhotoButton.frame)+20, kScreenHeight-100, 60, 60);
    [_rightButton setTitle:@"切换" forState:UIControlStateNormal];

    _rightButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_rightButton addTarget:self action:@selector(changeCamera) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_rightButton];
    
    _flashButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _flashButton.frame = CGRectMake(kScreenWidth-80,100, 80, 60);
    [_flashButton setTitle:@"闪光灯关" forState:UIControlStateNormal];
    [_flashButton addTarget:self action:@selector(FlashOn) forControlEvents:UIControlEventTouchUpInside];
    //[self.view addSubview:_flashButton];
    
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(focusGesture:)];
    [self.view addGestureRecognizer:tapGesture];
}

- (void)customCamera{
    self.view.backgroundColor = [UIColor blackColor];
    
    //使用AVMediaTypeVideo 指明self.device代表视频，默认使用后置摄像头进行初始化
    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    //使用设备初始化输入
    self.input = [[AVCaptureDeviceInput alloc]initWithDevice:self.device error:nil];
    
    //生成输出对象
    self.output = [[AVCaptureMetadataOutput alloc]init];
    self.ImageOutPut = [[AVCaptureStillImageOutput alloc] init];
    
    //生成会话，用来结合输入输出
    self.session = [[AVCaptureSession alloc]init];
    if ([self.session canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
        
        self.session.sessionPreset = AVCaptureSessionPreset1280x720;
        
    }
    if ([self.session canAddInput:self.input]) {
        [self.session addInput:self.input];
    }
    
    if ([self.session canAddOutput:self.ImageOutPut]) {
        [self.session addOutput:self.ImageOutPut];
    }
    
    //使用self.session，初始化预览层，self.session负责驱动input进行信息的采集，layer负责把图像渲染显示
    self.previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];
    CGFloat previewH = kScreenWidth * 0.56;
    self.previewLayer.frame = CGRectMake(0,kScreenHeight/2 - previewH/2, kScreenWidth, previewH);
    
    self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    //self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspect;
    [self.view.layer addSublayer:self.previewLayer];
    
    //开始启动
    
    [self.session startRunning];
    if ([_device lockForConfiguration:nil]) {
        if ([_device isFlashModeSupported:AVCaptureFlashModeAuto]) {
            [_device setFlashMode:AVCaptureFlashModeAuto];
        }
        //自动白平衡
        if ([_device isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {
            [_device setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];
        }
        [_device unlockForConfiguration];
    }
}

- (void)FlashOn{
    if ([_device lockForConfiguration:nil]) {
        if (_isflashOn) {
            if ([_device isFlashModeSupported:AVCaptureFlashModeOff]) {
                [_device setFlashMode:AVCaptureFlashModeOff];
                _isflashOn = NO;
                [_flashButton setTitle:@"闪光灯关" forState:UIControlStateNormal];
            }
        }else{
            if ([_device isFlashModeSupported:AVCaptureFlashModeOn]) {
                [_device setFlashMode:AVCaptureFlashModeOn];
                _isflashOn = YES;
                [_flashButton setTitle:@"闪光灯开" forState:UIControlStateNormal];
            }
        }
        
        [_device unlockForConfiguration];
    }
}

- (void)changeCamera{
    NSUInteger cameraCount = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count];
    if (cameraCount > 1) {
        NSError *error;
        
        CATransition *animation = [CATransition animation];
        
        animation.duration = .5f;
        
        animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        
        animation.type = @"oglFlip";
        AVCaptureDevice *newCamera = nil;
        AVCaptureDeviceInput *newInput = nil;
        AVCaptureDevicePosition position = [[_input device] position];
        if (position == AVCaptureDevicePositionFront){
            newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];
            animation.subtype = kCATransitionFromLeft;
        }
        else {
            newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];
            animation.subtype = kCATransitionFromRight;
        }
        
        newInput = [AVCaptureDeviceInput deviceInputWithDevice:newCamera error:nil];
        [self.previewLayer addAnimation:animation forKey:nil];
        if (newInput != nil) {
            [self.session beginConfiguration];
            [self.session removeInput:_input];
            if ([self.session canAddInput:newInput]) {
                [self.session addInput:newInput];
                self.input = newInput;
                
            } else {
                [self.session addInput:self.input];
            }
            
            [self.session commitConfiguration];
            
        } else if (error) {
            NSLog(@"toggle carema failed, error = %@", error);
        }
        
    }
}
- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position{
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for ( AVCaptureDevice *device in devices )
        if ( device.position == position ) return device;
    return nil;
}
- (void)focusGesture:(UITapGestureRecognizer*)gesture{
    CGPoint point = [gesture locationInView:gesture.view];
    [self focusAtPoint:point];
}
- (void)focusAtPoint:(CGPoint)point{
    CGSize size = self.view.bounds.size;
    CGPoint focusPoint = CGPointMake( point.y /size.height ,1-point.x/size.width );
    NSError *error;
    if ([self.device lockForConfiguration:&error]) {
        
        if ([self.device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
            [self.device setFocusPointOfInterest:focusPoint];
            [self.device setFocusMode:AVCaptureFocusModeAutoFocus];
        }
        
        if ([self.device isExposureModeSupported:AVCaptureExposureModeAutoExpose ]) {
            [self.device setExposurePointOfInterest:focusPoint];
            [self.device setExposureMode:AVCaptureExposureModeAutoExpose];
        }
        
        [self.device unlockForConfiguration];
        _focusView.center = point;
        _focusView.hidden = NO;
        [UIView animateWithDuration:0.3 animations:^{
            _focusView.transform = CGAffineTransformMakeScale(1.25, 1.25);
        }completion:^(BOOL finished) {
            [UIView animateWithDuration:0.5 animations:^{
                _focusView.transform = CGAffineTransformIdentity;
            } completion:^(BOOL finished) {
                _focusView.hidden = YES;
            }];
        }];
    }
    
}
#pragma mark - 拍照
- (void) shutterCamera
{
    AVCaptureConnection * videoConnection = [self.ImageOutPut connectionWithMediaType:AVMediaTypeVideo];
    if (!videoConnection) {
        NSLog(@"take photo failed!");
        return;
    }
    
    [self.ImageOutPut captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
        if (imageDataSampleBuffer == NULL) {
            return;
        }
        NSData * imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
        self.image = [UIImage imageWithData:imageData];
        [self.session stopRunning];
        CGFloat ImgH = kScreenWidth*0.56;
        self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,kScreenWidth,ImgH)];
        self.imageView.center = self.view.center;
        self.imageView.contentMode = UIViewContentModeScaleAspectFill;
        [self.view insertSubview:_imageView belowSubview:_PhotoButton];
        
        self.cutedImage = [self fixOrientation:self.image];
        self.cutedImage = [self wf_thumbnailsCutfullPhoto:self.cutedImage];
        self.imageView.layer.masksToBounds = YES;
        self.imageView.image = self.cutedImage;
        self.leftButton.selected = YES;
        self.rightButton.selected = YES;
        [self setcameraSelectBtns];
        //拍照获取到的图片真实大小
        NSLog(@"image size = %@",NSStringFromCGSize(self.image.size));
        //和显示镜头尺寸相同比例的裁剪后的图片 大小
        NSLog(@"cutedImage size = %@",NSStringFromCGSize(self.cutedImage.size));
        
    }];
}

-(void)setcameraSelectBtns{
    [_leftButton removeFromSuperview];
    [_rightButton removeFromSuperview];
    self.reMakeButton= [UIButton buttonWithType:UIButtonTypeCustom];
    _reMakeButton.frame = CGRectMake(kScreenWidth*1/2.0-30 - 20 - 60, kScreenHeight-100, 60, 60);
    [_reMakeButton setTitle:@"重拍" forState:UIControlStateNormal];
    _reMakeButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_reMakeButton addTarget:self action:@selector(reMakeButton:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.reMakeButton];
   
    
    self.userButton= [UIButton buttonWithType:UIButtonTypeCustom];
    _userButton.frame = CGRectMake(CGRectGetMaxX(_PhotoButton.frame)+20, kScreenHeight-100, 60, 60);
    [_userButton setTitle:@"使用" forState:UIControlStateNormal];
    _userButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_userButton addTarget:self action:@selector(userButton:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_userButton];
    
}

-(void)setNormalBtns{
    
    [_reMakeButton removeFromSuperview];
    [_userButton removeFromSuperview];
    
    self.leftButton= [UIButton buttonWithType:UIButtonTypeCustom];
    _leftButton.frame =CGRectMake(kScreenWidth*1/2.0-30 - 20 - 60, kScreenHeight-100, 60, 60);
    [_leftButton setTitle:@"取消" forState:UIControlStateNormal];
    _leftButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_leftButton addTarget:self action:@selector(cancle:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_leftButton];
    
    
    self.rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightButton.frame = CGRectMake(CGRectGetMaxX(_PhotoButton.frame)+20, kScreenHeight-100, 60, 60);
    [_rightButton setTitle:@"切换" forState:UIControlStateNormal];
    
    _rightButton.titleLabel.textAlignment = NSTextAlignmentCenter;
    [_rightButton addTarget:self action:@selector(changeCamera) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_rightButton];
   
}
//裁剪图片,
- (UIImage *)wf_thumbnailsCutfullPhoto:(UIImage*)image
{
    CGSize newSize;
    CGImageRef imageRef = nil;
    newSize.width = image.size.width;
    newSize.height = image.size.width * 0.56;
    CGFloat capImgW  = kScreenWidth;
    CGFloat CapImgH = kScreenWidth *0.56;
    
    imageRef = CGImageCreateWithImageInRect(self.image.CGImage,  CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
    
    if ((image.size.width / image.size.height) < (capImgW / CapImgH)) {
        newSize.width = image.size.width;
        newSize.height = image.size.width * CapImgH / capImgW;
        
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
    } else {
        newSize.height = image.size.height;
        newSize.width = image.size.height * capImgW / CapImgH;
        
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));
    }
    UIImage *img = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);

     return img;
}

- (UIImage *)fixOrientation:(UIImage *)aImage {
    
    // No-op if the orientation is already correct
    if (aImage.imageOrientation == UIImageOrientationUp)
        return aImage;
    
    // We need to calculate the proper transformation to make the image upright.
    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
    CGAffineTransform transform = CGAffineTransformIdentity;
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;
            
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;
            
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        default:
            break;
    }
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
            
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        default:
            break;
    }
    
    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
                                             CGImageGetBitsPerComponent(aImage.CGImage), 0,
                                             CGImageGetColorSpace(aImage.CGImage),
                                             CGImageGetBitmapInfo(aImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (aImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
            break;
            
        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
            break;
    }
    
    // And now we just create a new UIImage from the drawing context
    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
    UIImage *img = [UIImage imageWithCGImage:cgimg];
    CGContextRelease(ctx);
    CGImageRelease(cgimg);
    return img;
}

- (UIImage *) scaleFromImage: (UIImage *) image toSize: (CGSize) size
{
    UIGraphicsBeginImageContext(size);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

//截取部分图像
-(UIImage*)getSubImage:(CGRect)rect
{
    
    CGImageRef subImageRef = CGImageCreateWithImageInRect(self.image.CGImage,  CGRectMake(0, fabs(kScreenHeight - kScreenWidth *0.56) / 2, kScreenWidth, kScreenWidth *0.56));
   
    CGRect smallBounds = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef));
    
    UIGraphicsBeginImageContext(smallBounds.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextDrawImage(context, smallBounds, subImageRef);
    UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];
    UIGraphicsEndImageContext();
    
    return smallImage;
}




#pragma - 保存至相册
- (void)saveImageToPhotoAlbum:(UIImage*)savedImage
{
    
    UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
    
}
// 指定回调方法

- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo

{
//    NSString *msg = nil ;
//    if(error != NULL){
//        msg = @"保存图片失败" ;
//    }else{
//        msg = @"保存图片成功" ;
//    }
//    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存图片结果提示"
//                                                    message:msg
//                                                   delegate:self
//                                          cancelButtonTitle:@"确定"
//                                          otherButtonTitles:nil];
    //[alert show];
}
-(void)cancle:(UIButton*)btn{
    
   
    [self dismissViewControllerAnimated:YES completion:^{
    
    }];
    
    
}
#pragma mark - 检查相机权限
- (BOOL)canUserCamear{
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if (authStatus == AVAuthorizationStatusDenied) {
        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"请打开相机权限" message:@"设置-隐私-相机" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];
        alertView.tag = 100;
        [alertView show];
        return NO;
    }
    else{
        return YES;
    }
    return YES;
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0 && alertView.tag == 100) {
        
        NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        
        if([[UIApplication sharedApplication] canOpenURL:url]) {
            
            [[UIApplication sharedApplication] openURL:url];
            
        }
    }
}

#pragma mark - 重拍

-(void)reMakeButton:(UIButton*)btn{
    [self setNormalBtns];
    [self.imageView removeFromSuperview];
    [self.session startRunning];
    
}

#pragma mark - 使用

-(void)userButton:(UIButton *)btn{
    
    [self saveImageToPhotoAlbum:self.cutedImage];
     _tailoredImage ? _tailoredImage(self.cutedImage) : nil;
    [self dismissViewControllerAnimated:YES completion:^{
        
    }];
    
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end