/**
 * Copyright (c) 2015-present, Horcrux.
 * All rights reserved.
 *
 * This source code is licensed under the MIT-style license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RNSVGCircle.h"
#import "RCTLog.h"

@implementation RNSVGCircle

- (void)setCx:(NSString *)cx
{
    if (cx == _cx) {
        return;
    }
    [self invalidate];
    _cx = cx;
}

- (void)setCy:(NSString *)cy
{
    if (cy == _cy) {
        return;
    }
    [self invalidate];
    _cy = cy;
}

- (void)setR:(NSString *)r
{
    if (r == _r) {
        return;
    }
    [self invalidate];
    _r = r;
}

- (void)renderLayerTo:(CGContextRef)context
{
    self.d = [self getPath: context];
    [super renderLayerTo:context];
}

- (CGPathRef)getPath:(CGContextRef)context
{
    CGMutablePathRef path = CGPathCreateMutable();
    CGRect box = CGContextGetClipBoundingBox(context);
    float height = CGRectGetHeight(box);
    float width = CGRectGetWidth(box);
    
    RNSVGPercentageConverter* convert = [[RNSVGPercentageConverter alloc] init];
    CGFloat cx = [convert stringToFloat:self.cx relative:width offset:0];
    CGFloat cy = [convert stringToFloat:self.cy relative:height offset:0];
    CGFloat r;
    
    // radius in percentage calculate formula:
    // radius = sqrt(pow((width*percent), 2) + pow((height*percent), 2)) / sqrt(2)
    
    if ([convert isPercentage:self.r]) {
        CGFloat radiusPercent = [convert percentageToFloat:self.r relative:1 offset:0];
        r = sqrt(pow((width * radiusPercent), 2) + pow((height * radiusPercent), 2)) / sqrt(2);
    } else {
        r = [self.r floatValue];
    }
    
    CGPathAddArc(path, nil, cx, cy, r, 0, 2*M_PI, YES);
    return path;
}

@end