//
//  RABadgeNumberView.m
//  Apex And Drivers
//
//  Created by Jack on 2018/9/3.
//  Copyright © 2018年 USAI. All rights reserved.
//

#import "RABadgeNumberView.h"

#define Max_Width 30.0f
#define Min_Width 16.0f
#define Text_Size 12.0f

@interface RABadgeNumberView ()
{
    UIColor *_backgroundColor;
    UIColor *_foregroundColor;
}
@property (nonatomic,strong) CAShapeLayer *originLayer;
@property (nonatomic,strong) CAShapeLayer *borderLayer;
@property (nonatomic,strong) CATextLayer *valueLayer;

@end


@implementation RABadgeNumberView

#pragma mark - Utils

+ (CGSize)sizeOfString:(NSString *)string font:(UIFont *)font{
    
    if (string == nil) {
        return CGSizeZero;
    }
    
    NSDictionary *attribute = @{NSFontAttributeName: font};
    
    CGSize resSize = [string boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT)
                                          options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading)
                                       attributes:attribute
                                          context:nil].size;
    
    return resSize;
}

#pragma mark - Public

- (void)setBadgeNumber:(NSUInteger)badgeNumber {
    _badgeNumber = badgeNumber;
    
    self.hidden = _badgeNumber == 0;
    
    NSString *text = nil;
    if (_badgeNumber > 99) {
        text = @"99+";
    } else {
        text = [NSString stringWithFormat:@"%lu",badgeNumber];
    }
    
    [self.valueLayer setString:text];
    
    [self updateUI];
}

- (void)setForegroundColor:(UIColor *)foregroundColor {
    _foregroundColor = foregroundColor;
    self.valueLayer.foregroundColor = _foregroundColor.CGColor;
}

- (void)setBackgroundColor:(UIColor *)backgroundColor {
    _backgroundColor = backgroundColor;
    [self updateColor];
}

#pragma mark - Private

- (UIColor *)foregroundColor {
    if (_foregroundColor == nil) {
        _foregroundColor = [UIColor whiteColor];
    }
    return _foregroundColor;
}

- (UIColor *)backgroundColor {
    if (_backgroundColor == nil) {
        _backgroundColor = [UIColor redColor];
    }
    return _backgroundColor;
}

- (void)willMoveToSuperview:(UIView *)newSuperview {
    
    [super willMoveToSuperview:newSuperview];
    
    [self.layer addSublayer:self.originLayer];
    [self.layer addSublayer:self.borderLayer];
    [self.layer addSublayer:self.valueLayer];
    
    [self updateUI];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    
    [self updateUI];
}

#pragma mark Frame

- (void)setWidth:(CGFloat)width {
    
    NSLayoutConstraint *widthConstraint = nil;
    for (NSLayoutConstraint *constraint in self.constraints) {
        if (constraint.firstAttribute == NSLayoutAttributeWidth) {
            widthConstraint = constraint;
        }
    }
    
    if (widthConstraint) {
        widthConstraint.constant = width;
    } else {
        
        CGRect bounds = self.bounds;
        bounds.size.width = width;
        self.bounds = bounds;
    }
}

- (void)setHeight:(CGFloat)height {
    
    NSLayoutConstraint *heightConstraint = nil;
    for (NSLayoutConstraint *constraint in self.constraints) {
        if (constraint.firstAttribute == NSLayoutAttributeHeight) {
            heightConstraint = constraint;
        }
    }
    
    if (heightConstraint) {
        heightConstraint.constant = height;        
    } else {
        
        CGRect bounds = self.bounds;
        bounds.size.height = height;
        self.bounds = bounds;
    }
}

- (void)updateUI {
    
    CGSize size = [self.class sizeOfString:self.valueLayer.string font:[UIFont systemFontOfSize:Text_Size]];
    CGSize textSize = size;
    if (size.width < Min_Width) {
        size.width = Min_Width;
    }
    
    if (size.height < Min_Width) {
        size.height = Min_Width;
    }
    
    if (size.height > size.width) {
        size.width = size.height;
    }
    
    size.width += 5.0f;
    size.height += 5.0f;
    
    CGFloat r = size.height * 0.5;
    
    // 更新自身Size
    if (self.badgeNumber < 10) {
        [self setWidth:size.width];
    } else {
        [self setWidth:size.width + 5];
    }
    [self setHeight:size.height];
    
    // drag layer
    self.borderLayer.path = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:r].CGPath;
    
    // 更新TextLayer Frame
    CGFloat x = (CGRectGetWidth(self.bounds) - textSize.width) * 0.5,y = (CGRectGetHeight(self.bounds) - textSize.height) * 0.5;
    self.valueLayer.frame = CGRectMake(x, y, textSize.width, textSize.height);
}

- (void)updateColor {
    self.originLayer.fillColor = self.backgroundColor.CGColor;
    self.originLayer.strokeColor = self.backgroundColor.CGColor;
    self.borderLayer.fillColor = self.backgroundColor.CGColor;
    self.borderLayer.strokeColor = self.backgroundColor.CGColor;
}

#pragma mark Layer

- (CAShapeLayer *)originLayer {
    if (!_originLayer) {
        _originLayer = [CAShapeLayer layer];
        _originLayer.fillColor = self.backgroundColor.CGColor;
        _originLayer.strokeColor = self.backgroundColor.CGColor;
        _originLayer.lineWidth = 0.1f;
    }
    return _originLayer;
}

- (CAShapeLayer *)borderLayer {
    if (!_borderLayer) {
        _borderLayer = [CAShapeLayer layer];
        _borderLayer.fillColor = self.backgroundColor.CGColor;
        _borderLayer.strokeColor = self.backgroundColor.CGColor;
        _borderLayer.lineWidth = 0.1f;
    }
    return _borderLayer;
}

- (CATextLayer *)valueLayer {
    if (!_valueLayer) {
        _valueLayer = [CATextLayer layer];
        _valueLayer.foregroundColor = self.foregroundColor.CGColor;
        _valueLayer.contentsScale = [UIScreen mainScreen].scale;
        _valueLayer.alignmentMode = kCAAlignmentCenter;
        _valueLayer.contentsGravity = kCAGravityCenter;
        
        UIFont *font = [UIFont systemFontOfSize:Text_Size];
        CGFontRef fontRef = CGFontCreateWithFontName((__bridge_retained CFStringRef)font.fontName);
        _valueLayer.font = fontRef;
        _valueLayer.fontSize = font.pointSize;
        CGFontRelease(fontRef);
    }
    return _valueLayer;
}


@end