#import "ScanViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "ViewController.h"
#import "JSBridge.h"

#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define SCREEN_WIDTH  [UIScreen mainScreen].bounds.size.width
#define SCREEN_BOUNDS  [UIScreen mainScreen].bounds

#define TOP (SCREEN_HEIGHT-220)/2
#define LEFT (SCREEN_WIDTH-220)/2

#define kScanRect CGRectMake(LEFT, TOP, 220, 220)

@interface ScanViewController ()<AVCaptureMetadataOutputObjectsDelegate>{
    int num;
    BOOL upOrdown;
    NSTimer * timer;
    CAShapeLayer *cropLayer;
}
@property (strong,nonatomic)AVCaptureDevice * device;
@property (strong,nonatomic)AVCaptureDeviceInput * input;
@property (strong,nonatomic)AVCaptureMetadataOutput * output;
@property (strong,nonatomic)AVCaptureSession * session;
@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;
@property (strong,nonatomic)UIImageView * line;

@end

@implementation ScanViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
   
}

-(void)configView{
    
    UIImageView * imageView = [[UIImageView alloc]initWithFrame:kScanRect];
    imageView.image = [UIImage imageNamed:@"pick_bg"];
    [self.view addSubview:imageView];
    
    upOrdown = NO;
    num =0;
    _line = [[UIImageView alloc] initWithFrame:CGRectMake(LEFT, TOP+10, 220, 2)];
    _line.image = [UIImage imageNamed:@"line.png"];
    [self.view addSubview:_line];
    
    timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation1) userInfo:nil repeats:YES];
    
    
    UIImage* pImageButtonBack = [UIImage imageNamed:@"close.png"];
    
    float offset = 30;
    float width = pImageButtonBack.size.width;
    float height = pImageButtonBack.size.height;
   
    UIButton* pButtonBack = [[UIButton alloc] initWithFrame:CGRectMake(0,0,width,height)];
    pButtonBack.titleEdgeInsets = UIEdgeInsetsMake(44.0f, 0.0f, 0.0f, 0.0f);
    //[pButtonBack setTitle:@"后退" forState:UIControlStateNormal];
    [pButtonBack setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    pButtonBack.titleLabel.font = [UIFont systemFontOfSize:13.0];
    [pButtonBack setBackgroundImage:pImageButtonBack forState:UIControlStateNormal];
    pButtonBack.center = CGPointMake(offset,offset);
    [pButtonBack addTarget:self action:@selector(buttonClickBack:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:pButtonBack];

}
-(void)buttonClickBack:(id)sender
{
    [self dismissViewControllerAnimated:NO completion:nil];
}

-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear: animated];
    [self configView];
    //[self setCropRect:kScanRect];
    [self performSelector:@selector(setupCamera) withObject:nil afterDelay:0.3];
}

-(void)animation1
{
    if (upOrdown == NO) {
        num ++;
        _line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
        if (2*num == 200) {
            upOrdown = YES;
        }
    }
    else {
        num --;
        _line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
        if (num == 0) {
            upOrdown = NO;
        }
    }
}

- (void)setCropRect:(CGRect)cropRect{
    cropLayer = [[CAShapeLayer alloc] init];
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, nil, cropRect);
    CGPathAddRect(path, nil, self.view.bounds);
    
    [cropLayer setFillRule:kCAFillRuleEvenOdd];
    [cropLayer setPath:path];
    [cropLayer setFillColor:[UIColor blackColor].CGColor];
    [cropLayer setOpacity:0.6];
    
    
    [cropLayer setNeedsDisplay];
    
    [self.view.layer addSublayer:cropLayer];
}
- (void)setupCamera
{
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device==nil) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"设备没有摄像头" preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }]];
        [self presentViewController:alert animated:YES completion:nil];
        return;
    }
    // Device
    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    // Input
    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    
    // Output
    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    //设置扫描区域
    CGFloat top = TOP/SCREEN_HEIGHT;
    CGFloat left = LEFT/SCREEN_WIDTH;
    CGFloat width = 220/SCREEN_WIDTH;
    CGFloat height = 220/SCREEN_HEIGHT;
    ///top 与 left 互换  width 与 height 互换
    [_output setRectOfInterest:CGRectMake(top,left, height, width)];

   
    // Session
    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
        [_session addInput:self.input];
    }
    
    if ([_session canAddOutput:self.output])
    {
        [_session addOutput:self.output];
    }
    
    // 条码类型 AVMetadataObjectTypeQRCode
    [_output setMetadataObjectTypes:[NSArray arrayWithObjects:AVMetadataObjectTypeQRCode, nil]];
    
    // Preview
    _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
    _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
    _preview.frame =self.view.layer.bounds;
    [self.view.layer insertSublayer:_preview atIndex:0];
    
    // Start
    [_session startRunning];
}

#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    NSString *stringValue;
    
    if ([metadataObjects count] >0)
    {
        //停止扫描
        [_session stopRunning];
        [timer setFireDate:[NSDate distantFuture]];
        
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
        
        [JSBridge onScanResult:stringValue];
        NSLog(@"scan result：%@",stringValue);
        [self dismissViewControllerAnimated:NO completion:nil];
    } else {
        NSLog(@"no scan result");
        [self dismissViewControllerAnimated:NO completion:nil];
        return;
    }
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (BOOL)shouldAutorotate
{
    return YES;//支持转屏
}
//-------------------------------------------------------------------------------
- (BOOL)prefersStatusBarHidden
{
    return YES;//隐藏为YES，显示为NO
}
-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationPortrait;
}

@end