//
//  NSAttributedString.swift
//  VDS
//
//  Created by Matt Bruce on 5/30/23.
//

import Foundation
import UIKit

extension NSAttributedString {
    
    /// Spacer in the form of a AttributedString.
    /// - Parameter width: size of the space.
    /// - Returns: AttributedString with the Space of the width you asked.
    public static func spacer(for width: CGFloat) -> NSAttributedString {
        let spacerImage = UIImage()
        let spacerAttachment = NSTextAttachment()
        spacerAttachment.bounds = .init(x: 0, y: 0, width: width, height: 1)
        spacerAttachment.image = spacerImage
        return NSAttributedString(attachment: spacerAttachment)
    }
}

extension NSMutableAttributedString {
    
    /// This will used along with mutableText method to determine if you will use a ratio version of the lineHeight within a TextStyle if you have a scaled font being used.
    public static var useScaledLineHeight: Bool = false
    
    /// Creates a MutableAttributedString for the text and other properties you have passed into the method.
    /// - Parameters:
    ///   - text: Text you want to draw onscreen.
    ///   - textStyle: Style of Typography you want to render the Text.
    ///   - useScaledFont: Determines if you used a scaledFont or a normal Font from the TextStyle.
    ///   - textColor: Color of Text to render.
    ///   - alignment: Text alignment.
    ///   - lineBreakMode: LineBreak Mode.
    /// - Returns: MutableAttributedString from al lof the properties you passed in to help render Text using non-standard properties.
    public static func mutableText(for text: String, textStyle: TextStyle, useScaledFont: Bool = true, textColor: UIColor, alignment: NSTextAlignment = .left, lineBreakMode: NSLineBreakMode) -> NSMutableAttributedString {

        //var for if you can scale or not
        let scaledMode = useScaledFont && TextStyle.canScaleFonts

        //create the paragraph for specific properties
        let paragraph = NSMutableParagraphStyle()
        paragraph.alignment = alignment
        paragraph.lineBreakMode = lineBreakMode
        
        var defaultFont = textStyle.font
        var lineHeight = textStyle.lineHeight
        
        if scaledMode {
            defaultFont = defaultFont.scaledFont
            if useScaledLineHeight {
                lineHeight = textStyle.scaledLineHeight
            }
        }
                
        //set lineHeight
        if textStyle.lineHeight > 0.0 {
            paragraph.minimumLineHeight = lineHeight
            paragraph.maximumLineHeight = lineHeight
        }
        
        //create the attributeArray
        var attributes: [NSAttributedString.Key : Any] = [.font: defaultFont,
                                                          .foregroundColor: textColor,
                                                          .paragraphStyle: paragraph]
        
        //set letterSpacing
        attributes[.kern] = textStyle.letterSpacing
        
        return  NSMutableAttributedString(string: text, attributes: attributes)

    }
}