//
//  YHScanQRView.m
//  YHAVFoundtionQRScan
//
//  Created by Foxconn on 2018/1/25.
//  Copyright © 2018年 Foxconn. All rights reserved.
//

#import "YHScanQRView.h"

@interface YHScanQRView ()

@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, strong) UIImageView *scanningline;
@end
@implementation YHScanQRView

-(instancetype) initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
    }
    return self;
    
}

#pragma mark - - - get
- (UIImageView *)scanningline {
    if (!_scanningline) {
        _scanningline = [[UIImageView alloc] init];
        _scanningline.image = [UIImage imageNamed:self.scanningImageName];
    }
    return _scanningline;
}

#pragma mark - - - set
//扫描线名字
- (void)setScanningImageName:(NSString *)scanningImageName {
    _scanningImageName = scanningImageName;
}
//边框颜色
- (void)setBorderColor:(UIColor *)borderColor {
    _borderColor = borderColor;
}
//边角颜色
- (void)setCornerColor:(UIColor *)cornerColor {
    _cornerColor = cornerColor;
}
//边角宽度
- (void)setCornerWidth:(CGFloat)cornerWidth {
    _cornerWidth = cornerWidth;
}
//边角长度
- (void)setCornerLenght:(CGFloat)cornerLenght{
    _cornerLenght = cornerLenght;
}
//扫描view周边颜色的alpha值
- (void)setBackgroundAlpha:(CGFloat)backgroundAlpha {
    _backgroundAlpha = backgroundAlpha;
}
//边角位置
- (void)setCornerLocation:(CornerLoaction)cornerLocation {
    _cornerLocation = cornerLocation;
}
//背景颜色
-(void)setViewBGColor:(UIColor *)viewBGColor{
    _viewBGColor = viewBGColor;
}
//扫描框的X值
-(void)setScanViewX:(float)scanViewX{
    _scanViewX = scanViewX;
}
//扫描框的Y值
-(void)setScanViewY:(float)scanViewY{
    _scanViewY = scanViewY;
}
//扫描框的宽度
-(void)setScanViewWidth:(float)scanViewWidth{
    _scanViewWidth = scanViewWidth;
}
//扫描框的高度
-(void)setScanViewHeight:(float)scanViewHeight{
    _scanViewHeight = scanViewHeight;
}
#pragma mark - - - 添加定时器
- (void)addTimer {
    CGFloat scanninglineX = 0;
    CGFloat scanninglineY = 0;
    CGFloat scanninglineW = 0;
    CGFloat scanninglineH = 0;
    [self addSubview:self.scanningline];
    scanninglineW = _scanViewWidth;
    scanninglineH = 12;
    scanninglineX = _scanViewX;
    scanninglineY = _scanViewY;
    _scanningline.frame = CGRectMake(scanninglineX, scanninglineY, scanninglineW, scanninglineH);
    self.timer = [NSTimer scheduledTimerWithTimeInterval:self.animationTimeInterval target:self selector:@selector(beginTimer) userInfo:nil repeats:YES];
}
#pragma mark - - - 移除定时器
- (void)removeTimer {
    [self.timer invalidate];
    self.timer = nil;
    [self.scanningline removeFromSuperview];
    self.scanningline = nil;
}
#pragma mark - - - 执行定时器方法
- (void)beginTimer {
    __block  CGRect frame = _scanningline.frame;
    [UIView animateWithDuration:self.animationTimeInterval animations:^{
        frame.origin.y = 2 + frame.origin.y;
        _scanningline.frame = frame;
    } completion:^(BOOL finished) {
        if (_scanningline.frame.origin.y >= _scanViewY + _scanViewHeight - 10) {
            frame.origin.y = _scanViewY;
            _scanningline.frame = frame;
        }
    }];
}

//绘制边框 只留下中间的空白区域进行扫描
- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];
    
    // 边框 frame
    CGFloat borderW = _scanViewWidth;
    CGFloat borderH = _scanViewHeight;
    CGFloat borderX = _scanViewX;
    CGFloat borderY = _scanViewY;
    CGFloat borderLineW = 0.2;
    
    // 空白区域设置
    [[_viewBGColor colorWithAlphaComponent:self.backgroundAlpha] setFill];
    UIRectFill(rect);
    // 获取上下文，并设置混合模式 -> kCGBlendModeDestinationOut
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetBlendMode(context, kCGBlendModeDestinationOut);
    // 设置空白区 用来扫描
    UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRect:CGRectMake(borderX + 0.5 * borderLineW, borderY + 0.5 *borderLineW, borderW - borderLineW, borderH - borderLineW)];
    [bezierPath fill];
    // 执行混合模式
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    
    /// 边框设置
    UIBezierPath *borderPath = [UIBezierPath bezierPathWithRect:CGRectMake(borderX, borderY, borderW, borderH)];
    borderPath.lineCapStyle = kCGLineCapButt;
    borderPath.lineWidth = borderLineW;
    [self.borderColor set];
    [borderPath stroke];
    
    //边角长度
    CGFloat cornerLenght = self.cornerLenght;
    /// 左上角小图标
    UIBezierPath *leftTopPath = [UIBezierPath bezierPath];
    leftTopPath.lineWidth = self.cornerWidth;
    [self.cornerColor set];
    
    CGFloat insideExcess = fabs(0.5 * (self.cornerWidth - borderLineW));
    CGFloat outsideExcess = 0.5 * (borderLineW + self.cornerWidth);
    if (self.cornerLocation == CornerLoactionInside) {
        [leftTopPath moveToPoint:CGPointMake(borderX + insideExcess, borderY + cornerLenght + insideExcess)];
        [leftTopPath addLineToPoint:CGPointMake(borderX + insideExcess, borderY + insideExcess)];
        [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLenght + insideExcess, borderY + insideExcess)];
    } else if (self.cornerLocation == CornerLoactionOutside) {
        [leftTopPath moveToPoint:CGPointMake(borderX - outsideExcess, borderY + cornerLenght - outsideExcess)];
        [leftTopPath addLineToPoint:CGPointMake(borderX - outsideExcess, borderY - outsideExcess)];
        [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLenght - outsideExcess, borderY - outsideExcess)];
    } else {
        [leftTopPath moveToPoint:CGPointMake(borderX, borderY + cornerLenght)];
        [leftTopPath addLineToPoint:CGPointMake(borderX, borderY)];
        [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLenght, borderY)];
    }
    
    [leftTopPath stroke];
    
    /// 左下角小图标
    UIBezierPath *leftBottomPath = [UIBezierPath bezierPath];
    leftBottomPath.lineWidth = self.cornerWidth;
    [self.cornerColor set];
    
    if (self.cornerLocation == CornerLoactionInside) {
        [leftBottomPath moveToPoint:CGPointMake(borderX + cornerLenght + insideExcess, borderY + borderH - insideExcess)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX + insideExcess, borderY + borderH - insideExcess)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX + insideExcess, borderY + borderH - cornerLenght - insideExcess)];
    } else if (self.cornerLocation == CornerLoactionOutside) {
        [leftBottomPath moveToPoint:CGPointMake(borderX + cornerLenght - outsideExcess, borderY + borderH + outsideExcess)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX - outsideExcess, borderY + borderH + outsideExcess)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX - outsideExcess, borderY + borderH - cornerLenght + outsideExcess)];
    } else {
        [leftBottomPath moveToPoint:CGPointMake(borderX + cornerLenght, borderY + borderH)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX, borderY + borderH)];
        [leftBottomPath addLineToPoint:CGPointMake(borderX, borderY + borderH - cornerLenght)];
    }
    
    [leftBottomPath stroke];
    
    /// 右上角小图标
    UIBezierPath *rightTopPath = [UIBezierPath bezierPath];
    rightTopPath.lineWidth = self.cornerWidth;
    [self.cornerColor set];
    
    if (self.cornerLocation == CornerLoactionInside) {
        [rightTopPath moveToPoint:CGPointMake(borderX + borderW - cornerLenght - insideExcess, borderY + insideExcess)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW - insideExcess, borderY + insideExcess)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW - insideExcess, borderY + cornerLenght + insideExcess)];
    } else if (self.cornerLocation == CornerLoactionOutside) {
        [rightTopPath moveToPoint:CGPointMake(borderX + borderW - cornerLenght + outsideExcess, borderY - outsideExcess)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW + outsideExcess, borderY - outsideExcess)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW + outsideExcess, borderY + cornerLenght - outsideExcess)];
    } else {
        [rightTopPath moveToPoint:CGPointMake(borderX + borderW - cornerLenght, borderY)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW, borderY)];
        [rightTopPath addLineToPoint:CGPointMake(borderX + borderW, borderY + cornerLenght)];
    }
    
    [rightTopPath stroke];
    
    /// 右下角小图标
    UIBezierPath *rightBottomPath = [UIBezierPath bezierPath];
    rightBottomPath.lineWidth = self.cornerWidth;
    [self.cornerColor set];
    
    if (self.cornerLocation == CornerLoactionInside) {
        [rightBottomPath moveToPoint:CGPointMake(borderX + borderW - insideExcess, borderY + borderH - cornerLenght - insideExcess)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW - insideExcess, borderY + borderH - insideExcess)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW - cornerLenght - insideExcess, borderY + borderH - insideExcess)];
    } else if (self.cornerLocation == CornerLoactionOutside) {
        [rightBottomPath moveToPoint:CGPointMake(borderX + borderW + outsideExcess, borderY + borderH - cornerLenght + outsideExcess)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW + outsideExcess, borderY + borderH + outsideExcess)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW - cornerLenght + outsideExcess, borderY + borderH + outsideExcess)];
    } else {
        [rightBottomPath moveToPoint:CGPointMake(borderX + borderW, borderY + borderH - cornerLenght)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW, borderY + borderH)];
        [rightBottomPath addLineToPoint:CGPointMake(borderX + borderW - cornerLenght, borderY + borderH)];
    }
    
    [rightBottomPath stroke];
    
}


@end