import CoreText
import UIKit

extension NSAttributedString {
    func ss_pageRanges(size: CGSize) -> [NSRange] {
        var ranges: [NSRange] = []
        let framesetter = CTFramesetterCreateWithAttributedString(self)
        let path = CGPath(rect: CGRect(origin: .zero, size: size), transform: nil)
        var visibleRange = CFRangeMake(0, 0)
        var location = 0

        while visibleRange.location + visibleRange.length < length {
            let frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(location, 0), path, nil)
            visibleRange = CTFrameGetVisibleStringRange(frame)
            guard visibleRange.length > 0 else {
                break
            }
            ranges.append(NSRange(location: location, length: visibleRange.length))
            location += visibleRange.length
        }

        return ranges
    }
}

extension UIColor {
    var ss_cssString: String {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        var alpha: CGFloat = 0
        getRed(&red, green: &green, blue: &blue, alpha: &alpha)
        return String(format: "rgba(%d, %d, %d, %.3f)", Int(red * 255), Int(green * 255), Int(blue * 255), alpha)
    }
}