//
//  ONEQRScanView.m
//  Pods
//
//  Created by Nemocdz on 2017/5/2.
//
//

#import "CDZQRScanView.h"
#import <AVFoundation/AVFoundation.h>

static CGFloat scanTime = 2.0;
static CGFloat borderLineWidth = 0.5;
static CGFloat cornerLineWidth = 2;//1.5
//static CGFloat scanLineWidth = 42;
static NSString *const scanLineAnimationName = @"scanLineAnimation";

@interface CDZQRScanView ()<AVCaptureMetadataOutputObjectsDelegate>
@property (nonatomic, strong) AVCaptureDevice *device;
@property (nonatomic, strong) AVCaptureDeviceInput *deviceInput;
@property (nonatomic, strong) AVCaptureMetadataOutput *dataOutput;
@property (nonatomic, strong) AVCaptureSession *session;
@property (nonatomic, strong) UIView *scanLine;
@property (nonatomic, strong) UIView *middleView;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
@end

@implementation CDZQRScanView
- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor blackColor];
        _showScanLine = YES;
        _showCornerLine = YES;
        _showBorderLine = NO;
    }
    return self;
}



- (void)configCameraAndStart{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        NSError *error;
        self.deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:&error];
        if (error) {
            NSLog(@"%@",error);
        }
        self.dataOutput = [[AVCaptureMetadataOutput alloc] init];
        [self.dataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

        self.session = [[AVCaptureSession alloc] init];
        if ([self.device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1920x1080]) {
            [self.session setSessionPreset:AVCaptureSessionPreset1920x1080];
        }
        else{
            [self.session setSessionPreset:AVCaptureSessionPresetHigh];
        }    
        if ([self.session canAddInput:self.deviceInput]){
            [self.session addInput:self.deviceInput];
        }
        if ([self.session canAddOutput:self.dataOutput]){
            [self.session addOutput:self.dataOutput];
        }
        if (![self.dataOutput.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {
            NSLog(@"The camera unsupport for QRCode.");
        }
        self.dataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
            self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
            self.previewLayer.frame = self.frame;
            [self.layer insertSublayer:self.previewLayer atIndex:0];
            [self.session startRunning];
             self.dataOutput.rectOfInterest = [self.previewLayer metadataOutputRectOfInterestForRect:self.scanRect];
            NSLog(@"%@",NSStringFromCGRect(self.dataOutput.rectOfInterest));
            [self showScanLine:self.isShowScanLine];
        });
    });
}

- (void)showScanLine:(BOOL)showScanLine{
    if (showScanLine) {
        [self addScanLineAnimation];
    }
    else{
        [self removeScanLineAnimation];
    }
}

- (void)startScanning{
    if (![self statusCheck]) {
        return;
    }
    if (!self.session) {
        [self setupViews];
        [self configCameraAndStart];
        return;
    }
    if (self.session.isRunning){
        return;
    }
    [self.session startRunning];
    [self showScanLine:self.isShowScanLine];
}

- (void)stopScanning{
    if (!self.session.isRunning){
        return;
    }
    [self.session stopRunning];
    [self showScanLine:NO];
}


- (BOOL)statusCheck{
    if (![self isCameraAvailable]){
        [self showWarn:@"设备无相机——设备无相机功能，无法进行扫描"];
        return NO;
    }
    if (![self isRearCameraAvailable] && ![self isFrontCameraAvailable]) {
        [self showWarn:@"设备相机错误——无法启用相机，请检查"];
        return NO;
    }
    if (![self isCameraAuthStatusCorrect]) {
        [self showWarn:@"未打开相机权限 ——请在“设置-隐私-相机”选项中，允许优易学车访问你的相机"];
        return NO;
    }
    return YES;
}

- (void)showWarn:(NSString *)message{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"好" style:UIAlertActionStyleCancel handler:nil];
    [alert addAction:cancelAction];
    [(UIViewController *)self.delegate presentViewController:alert animated:YES completion:nil];
}


- (void)setupViews{
    [self addSubview:self.middleView];
    [self.middleView addSubview:self.scanLine];
    [self addSubview:self.maskView];
    if (self.isShowCornerLine) {
        [self addCornerLines];
    }
    if (self.isShowBorderLine){
        [self addScanBorderLine];
    }
}


- (BOOL)isCameraAvailable{
    return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
}

- (BOOL)isFrontCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}

- (BOOL)isRearCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}

- (BOOL)isCameraAuthStatusCorrect{
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    NSLog(@"AVAuthorizationStatus: %ld",authStatus);
    if (authStatus == AVAuthorizationStatusAuthorized || authStatus == AVAuthorizationStatusNotDetermined) {
        return YES;
    }
    return NO;
}

- (void)addScanLineAnimation{
    self.scanLine.hidden = NO;
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    animation.fromValue = @(- CGRectGetHeight(self.scanLine.frame));
    animation.toValue = @(self.scanRect.size.height - CGRectGetHeight(self.scanLine.frame));
    animation.duration = scanTime;
    animation.repeatCount = OPEN_MAX;
    animation.fillMode = kCAFillModeForwards;
    animation.removedOnCompletion = NO;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    [self.scanLine.layer addAnimation:animation forKey:scanLineAnimationName];
}


- (void)removeScanLineAnimation{
    [self.scanLine.layer removeAnimationForKey:scanLineAnimationName];
    self.scanLine.hidden = YES;
}

#pragma mark - flash
- (void)changeTorch
{
    AVCaptureTorchMode torch = self.deviceInput.device.torchMode;
    
    switch (_deviceInput.device.torchMode) {
        case AVCaptureTorchModeAuto:
            break;
        case AVCaptureTorchModeOff:
            torch = AVCaptureTorchModeOn;
            break;
        case AVCaptureTorchModeOn:
            torch = AVCaptureTorchModeOff;
            break;
        default:
            break;
    }
    // 更改设置的时候必须先锁定设备，修改完后再解锁，否则崩溃
    [_deviceInput.device lockForConfiguration:nil];
	
	// 判断设备是否支持闪光灯
    if ([_deviceInput.device hasFlash]) {
		_deviceInput.device.torchMode = torch;
    }else {
		ShowMsg(@"该设备不支持闪光灯");
    }
	
	// 修改完毕解锁
	[_deviceInput.device unlockForConfiguration];
}


#pragma mark - bezierPath

- (void)addScanBorderLine{
    CGRect borderRect = CGRectMake(self.scanRect.origin.x + borderLineWidth, self.scanRect.origin.y + borderLineWidth, self.scanRect.size.width - 2*borderLineWidth, self.scanRect.size.height - 2*borderLineWidth);
    UIBezierPath *scanBezierPath = [UIBezierPath bezierPathWithRect:borderRect];
    CAShapeLayer *lineLayer = [CAShapeLayer layer];
    lineLayer.path = scanBezierPath.CGPath;
    lineLayer.lineWidth = borderLineWidth;
    lineLayer.strokeColor = self.borderLineColor.CGColor;
    lineLayer.fillColor = [UIColor clearColor].CGColor;
    [self.layer addSublayer:lineLayer];
}

- (void)addCornerLines{
    CAShapeLayer *lineLayer = [CAShapeLayer layer];
    lineLayer.lineWidth = cornerLineWidth;
    lineLayer.strokeColor = self.cornerLineColor.CGColor;
    lineLayer.fillColor = [UIColor clearColor].CGColor;
    CGFloat halfLineLong = self.scanRect.size.width / 17;
    UIBezierPath *lineBezierPath = [UIBezierPath bezierPath];
    
    CGFloat spacing = cornerLineWidth/2;
    
    CGPoint leftUpPoint = (CGPoint){self.scanRect.origin.x + spacing ,self.scanRect.origin.y + spacing};
    [lineBezierPath moveToPoint:(CGPoint){leftUpPoint.x,leftUpPoint.y + halfLineLong}];
    [lineBezierPath addLineToPoint:leftUpPoint];
    [lineBezierPath addLineToPoint:(CGPoint){leftUpPoint.x + halfLineLong,leftUpPoint.y}];
    lineLayer.path = lineBezierPath.CGPath;
    [self.layer addSublayer:lineLayer];
    

    CGPoint leftDownPoint = (CGPoint){self.scanRect.origin.x + spacing,self.scanRect.origin.y + self.scanRect.size.height - spacing};
    [lineBezierPath moveToPoint:(CGPoint){leftDownPoint.x,leftDownPoint.y - halfLineLong}];
    [lineBezierPath addLineToPoint:leftDownPoint];
    [lineBezierPath addLineToPoint:(CGPoint){leftDownPoint.x + halfLineLong,leftDownPoint.y}];
    lineLayer.path = lineBezierPath.CGPath;
    [self.layer addSublayer:lineLayer];
    
    CGPoint rightUpPoint = (CGPoint){self.scanRect.origin.x + self.scanRect.size.width - spacing,self.scanRect.origin.y + spacing};
    [lineBezierPath moveToPoint:(CGPoint){rightUpPoint.x - halfLineLong,rightUpPoint.y}];
    [lineBezierPath addLineToPoint:rightUpPoint];
    [lineBezierPath addLineToPoint:(CGPoint){rightUpPoint.x,rightUpPoint.y + halfLineLong}];
    lineLayer.path = lineBezierPath.CGPath;
    [self.layer addSublayer:lineLayer];
    
    CGPoint rightDownPoint = (CGPoint){self.scanRect.origin.x + self.scanRect.size.width - spacing,self.scanRect.origin.y + self.scanRect.size.height - spacing};
    [lineBezierPath moveToPoint:(CGPoint){rightDownPoint.x - halfLineLong,rightDownPoint.y}];
    [lineBezierPath addLineToPoint:rightDownPoint];
    [lineBezierPath addLineToPoint:(CGPoint){rightDownPoint.x,rightDownPoint.y - halfLineLong}];
    lineLayer.path = lineBezierPath.CGPath;
    [self.layer addSublayer:lineLayer];
}



#pragma mark - AVCaptureMetadataOutputObjectsDelegate

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray<AVMetadataMachineReadableCodeObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    if (metadataObjects.count == 0) {
        return;
    }
    NSString *result = [metadataObjects.firstObject stringValue];
    if ([self.delegate respondsToSelector:@selector(scanView:pickUpMessage:)]) {
        [self.delegate scanView:self pickUpMessage:result];
    }
}

#pragma mark - getter&setter

- (CGRect)scanRect{
    if (CGRectIsEmpty(_scanRect)) {
        CGSize scanSize = CGSizeMake(self.frame.size.width * 3/4, self.frame.size.width * 3/4);
        _scanRect = CGRectMake((self.frame.size.width - scanSize.width)/2, (self.frame.size.height - scanSize.height)/2, scanSize.width, scanSize.height);
    }
    return _scanRect;
}

- (UIView *)maskView{
    if (!_maskView) {
        _maskView = [[UIView alloc]initWithFrame:self.bounds];
        _maskView.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
        UIBezierPath *fullBezierPath = [UIBezierPath bezierPathWithRect:self.bounds];
        UIBezierPath *scanBezierPath = [UIBezierPath bezierPathWithRect:self.scanRect];
        [fullBezierPath appendPath:[scanBezierPath  bezierPathByReversingPath]];
        CAShapeLayer *shapeLayer = [CAShapeLayer layer];
        shapeLayer.path = fullBezierPath.CGPath;
        _maskView.layer.mask = shapeLayer;
    }
    return _maskView;
}

- (UIView *)middleView{
    if (!_middleView) {
        _middleView = [[UIView alloc]initWithFrame:self.scanRect];
        _middleView.clipsToBounds = YES;
    }
    return _middleView;
}

- (UIView *)scanLine{
    if (!_scanLine) {
//        _scanLine = [[UIView alloc]initWithFrame:CGRectMake(0,0, self.scanRect.size.width, scanLineWidth)];
//        _scanLine.hidden = YES;
//        CAGradientLayer *gradient = [CAGradientLayer layer];
//        gradient.startPoint = CGPointMake(0.5, 0);
//        gradient.endPoint = CGPointMake(0.5, 1);
//        gradient.frame = _scanLine.layer.bounds;
//        gradient.colors = @[(__bridge id)[self.scanLineColor colorWithAlphaComponent:0].CGColor,(__bridge id)[self.scanLineColor colorWithAlphaComponent:0.4f].CGColor,(__bridge id)self.scanLineColor.CGColor];
//        gradient.locations = @[@0,@0.96,@0.97];
//        [_scanLine.layer addSublayer:gradient];
        
        UIImageView *scanLine = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.middleView.size.width, self.middleView.size.height)];
        scanLine.hidden = YES;
        scanLine.image = [UIImage imageNamed:@"qrcode_scan_part_net"];
        _scanLine = scanLine;
    }
    return _scanLine;
}


- (UIColor *)cornerLineColor{
    if (!_cornerLineColor) {
        _cornerLineColor = [UIColor orangeColor];
    }
    return _cornerLineColor;
}

- (UIColor *)borderLineColor{
    if (!_borderLineColor) {
        _borderLineColor = [UIColor whiteColor];
    }
    return _borderLineColor;
}

- (UIColor *)scanLineColor{
    if (!_scanLineColor) {
        _scanLineColor = [UIColor orangeColor];
    }
    return _scanLineColor;
}

@end