//
//  CaptionTextLayoutManager.swift
//  Mirchi
//
//  Created by Miro Markarian on 5/26/21.
//  Copyright © 2021 Mirchi Inc. All rights reserved.
//

import UIKit

@objc @objcMembers class CaptionTextLayoutManager: NSLayoutManager {
    override func drawUnderline(forGlyphRange glyphRange: NSRange,
        underlineType underlineVal: NSUnderlineStyle,
        baselineOffset: CGFloat,
        lineFragmentRect lineRect: CGRect,
        lineFragmentGlyphRange lineGlyphRange: NSRange,
        containerOrigin: CGPoint
    ) {
        // The following is never printed and this function is never called in iOS 15.2
        print("DRAWING UNDERLINE VIA drawUnderline...")
        
        let firstPosition  = location(forGlyphAt: glyphRange.location).x

        let lastPosition: CGFloat

        if NSMaxRange(glyphRange) < NSMaxRange(lineGlyphRange) {
            lastPosition = location(forGlyphAt: NSMaxRange(glyphRange)).x
        } else {
            lastPosition = lineFragmentUsedRect(
                forGlyphAt: NSMaxRange(glyphRange) - 1,
                effectiveRange: nil).size.width
        }

        var lineRect = lineRect
        let height = lineRect.size.height - baselineOffset + 5 // replace your under line height
        lineRect.origin.x += firstPosition
        lineRect.size.width = lastPosition - firstPosition
        lineRect.size.height = height

        lineRect.origin.x += containerOrigin.x
        lineRect.origin.y += containerOrigin.y

        lineRect = lineRect.integral.insetBy(dx: -5, dy: -5)

        // Draw the background
        let path = UIBezierPath(roundedRect: lineRect, cornerRadius: 5)
        path.fill()
        
        // Draw the underline
        let underlineRect = CGRect(x: lineRect.origin.x, y: lineRect.origin.y + lineRect.size.height - 3, width: lineRect.size.width, height: 3)
        
        let pathBottom = UIBezierPath(roundedRect: underlineRect, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 5, height: 5))
        UIColor(red: 59.0/255.0, green: 251.0/255.0, blue: 208.0/255.0, alpha: 1.0).setFill()
        pathBottom.fill()
    }
}