From 31b9704163e64fd444759d51630254df0c1271ab Mon Sep 17 00:00:00 2001
From: Matt Bruce <matt.bruce@verizon.com>
Date: Fri, 21 Jun 2024 12:20:39 -0500
Subject: [PATCH] first attempt to get link clicks working again

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>
---
 VDS/Components/Label/Label.swift | 85 ++++++++++++++++++++++++++++----
 1 file changed, 75 insertions(+), 10 deletions(-)

diff --git a/VDS/Components/Label/Label.swift b/VDS/Components/Label/Label.swift
index 15ed4b45..c622b694 100644
--- a/VDS/Components/Label/Label.swift
+++ b/VDS/Components/Label/Label.swift
@@ -411,20 +411,85 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
     
     private func didTapActionInLabel(_ location: CGPoint, inRange targetRange: NSRange) -> Bool {
         
-        guard let attributedText else { return false }
+//        guard let attributedText else { return false }
+//        let layoutManager = NSLayoutManager()
+//        let textContainer = NSTextContainer(size: bounds.size)
+//        let textStorage = NSTextStorage(attributedString: attributedText)
+        //        layoutManager.addTextContainer(textContainer)
+        //        textStorage.addLayoutManager(layoutManager)
+        //
+        //        let characterIndex = layoutManager.characterIndex(for: location, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
+        //
+        //        guard let _ = attributedText.attribute(NSAttributedString.Key.action, at: characterIndex, effectiveRange: nil) as? String,
+        //                characterIndex < attributedText.length else {
+        //            return false
+        //        }
+        //        return true
+        
+        // There would only ever be one clause to act on.
+        guard let abstractContainer = abstractTextContainer() else { return false }
+        let textContainer = abstractContainer.0
+        let layoutManager = abstractContainer.1
+        
+        let tapLocation = location
+        let indexOfGlyph = layoutManager.glyphIndex(for: tapLocation, in: textContainer)
+        let intrinsicWidth = intrinsicContentSize.width
+        
+        // Assert that tapped occured within acceptable bounds based on alignment.
+        switch textAlignment {
+        case .right:
+            if tapLocation.x < bounds.width - intrinsicWidth {
+                return false
+            }
+        case .center:
+            let halfBounds = bounds.width / 2
+            let halfIntrinsicWidth = intrinsicWidth / 2
+            
+            if tapLocation.x > halfBounds + halfIntrinsicWidth {
+                return false
+            } else if tapLocation.x < halfBounds - halfIntrinsicWidth {
+                return false
+            }
+        default: // Left align
+            if tapLocation.x > intrinsicWidth {
+                return false
+            }
+        }
+        
+        // Affirms that the tap occured in the desired rect of provided by the target range.
+        return layoutManager.boundingRect(forGlyphRange: targetRange, in: textContainer).contains(tapLocation) && NSLocationInRange(indexOfGlyph, targetRange)
+    }
+    
+    /**
+     Provides a text container and layout manager of how the text would appear on screen.
+     They are used in tandem to derive low-level TextKit results of the label.
+     */
+    public func abstractTextContainer() -> (NSTextContainer, NSLayoutManager, NSTextStorage)? {
+        
+        // Must configure the attributed string to translate what would appear on screen to accurately analyze.
+        guard let attributedText = attributedText else { return nil }
+        
+        let paragraph = NSMutableParagraphStyle()
+        paragraph.alignment = textAlignment
+        
+        let stagedAttributedString = NSMutableAttributedString(attributedString: attributedText)
+        stagedAttributedString.addAttributes([NSAttributedString.Key.paragraphStyle: paragraph], range: NSRange(location: 0, length: attributedText.string.count))
+        
+        let textStorage = NSTextStorage(attributedString: stagedAttributedString)
         let layoutManager = NSLayoutManager()
-        let textContainer = NSTextContainer(size: bounds.size)
-        let textStorage = NSTextStorage(attributedString: attributedText)
+        let textContainer = NSTextContainer(size: .zero)
+        
         layoutManager.addTextContainer(textContainer)
         textStorage.addLayoutManager(layoutManager)
-
-        let characterIndex = layoutManager.characterIndex(for: location, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
-
-        guard let _ = attributedText.attribute(NSAttributedString.Key.action, at: characterIndex, effectiveRange: nil) as? String, characterIndex < attributedText.length else { return false }
-        return true
+        
+        textContainer.lineFragmentPadding = 0.0
+        textContainer.lineBreakMode = lineBreakMode
+        textContainer.maximumNumberOfLines = numberOfLines
+        textContainer.size = bounds.size
+        
+        return (textContainer, layoutManager, textStorage)
     }
-
-
+    
     private func customAccessibilityElement(text: String?, range: NSRange, accessibleText: String? = nil) -> AccessibilityActionElement? {
         
         guard let text = text, let attributedText else { return nil }