feat: set comment name color above WCAG Guidelines

app/src/main/java/ani/dantotsu/media/comments/CommentItem.kt

@@ -27,12 +27,14 @@ import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.TimeZone
 import kotlin.math.abs
+import kotlin.math.pow
 import kotlin.math.sqrt
 
 class CommentItem(val comment: Comment,
                   private val markwon: Markwon,
                   private val section: Section,
                   private val commentsActivity: CommentsActivity,
+                  private val backgroundColor: Int
 ) : BindableItem<ItemCommentsBinding>() {
     var binding: ItemCommentsBinding? = null
     val adapter = GroupieAdapter()
@@ -162,7 +164,7 @@ class CommentItem(val comment: Comment,
         viewBinding.commentUserAvatar
         comment.profilePictureUrl?.let { viewBinding.commentUserAvatar.loadImage(it) }
         viewBinding.commentUserName.text = comment.username
-        viewBinding.commentUserName.setTextColor(getAvatarColor(comment.upvotes - comment.downvotes))
+        viewBinding.commentUserName.setTextColor(getAvatarColor(comment.upvotes - comment.downvotes, backgroundColor))
         viewBinding.commentUserTime.text = "● ${formatTimestamp(comment.timestamp)}"
     }
 
@@ -236,15 +238,68 @@ class CommentItem(val comment: Comment,
         }
     }
 
-    private fun getAvatarColor(voteCount: Int): Int {
+    private fun getLuminance(color: Int): Double {
-        //0.8x^{2} where x is the level
+        val r = Color.red(color) / 255.0
+        val g = Color.green(color) / 255.0
+        val b = Color.blue(color) / 255.0
+
+        val rL = if (r <= 0.03928) r / 12.92 else ((r + 0.055) / 1.055).pow(2.4)
+        val gL = if (g <= 0.03928) g / 12.92 else ((g + 0.055) / 1.055).pow(2.4)
+        val bL = if (b <= 0.03928) b / 12.92 else ((b + 0.055) / 1.055).pow(2.4)
+
+        return 0.2126 * rL + 0.7152 * gL + 0.0722 * bL
+    }
+
+    private fun getContrastRatio(color1: Int, color2: Int): Double {
+        val l1 = getLuminance(color1)
+        val l2 = getLuminance(color2)
+
+        return if (l1 > l2) (l1 + 0.05) / (l2 + 0.05) else (l2 + 0.05) / (l1 + 0.05)
+    }
+
+    private fun getAvatarColor(voteCount: Int, backgroundColor: Int): Int {
         val level = sqrt(abs(voteCount.toDouble()) / 0.8).toInt()
-        return if (level > usernameColors.size - 1) {
+        val colorString = if (level > usernameColors.size - 1) usernameColors[usernameColors.size - 1] else usernameColors[level]
-            Color.parseColor(usernameColors[usernameColors.size - 1])
+        var color = Color.parseColor(colorString)
-        } else {
+        val ratio = getContrastRatio(color, backgroundColor)
-            Color.parseColor(usernameColors[level])
+        if (ratio < 4.5) {
+            color = adjustColorForContrast(color, backgroundColor)
+        }
+
+        return color
+    }
+
+    private fun adjustColorForContrast(originalColor: Int, backgroundColor: Int): Int {
+        var adjustedColor = originalColor
+        var contrastRatio = getContrastRatio(adjustedColor, backgroundColor)
+        val isBackgroundDark = getLuminance(backgroundColor) < 0.5
+
+        while (contrastRatio < 4.5) {
+            // Adjust brightness by modifying the RGB values
+            val r = Color.red(adjustedColor)
+            val g = Color.green(adjustedColor)
+            val b = Color.blue(adjustedColor)
+
+            // Calculate the amount to adjust
+            val adjustment = if (isBackgroundDark) 10 else -10
+
+            // Adjust the color
+            val newR = (r + adjustment).coerceIn(0, 255)
+            val newG = (g + adjustment).coerceIn(0, 255)
+            val newB = (b + adjustment).coerceIn(0, 255)
+
+            adjustedColor = Color.rgb(newR, newG, newB)
+            contrastRatio = getContrastRatio(adjustedColor, backgroundColor)
+
+            // Break the loop if the color adjustment does not change (to avoid infinite loop)
+            if (newR == r && newG == g && newB == b) {
+                break
             }
         }
+        return adjustedColor
+    }
+
+
 
     private val usernameColors: Array<String> = arrayOf(
         "#9932cc",

app/src/main/java/ani/dantotsu/media/comments/CommentsActivity.kt

@@ -1,5 +1,6 @@
 package ani.dantotsu.media.comments
 
+import android.graphics.drawable.ColorDrawable
 import android.graphics.drawable.Drawable
 import android.os.Bundle
 import android.text.TextWatcher
@@ -55,6 +56,7 @@ class CommentsActivity : AppCompatActivity() {
     private val section = Section()
     private val adapter = GroupieAdapter()
     private var mediaId: Int = -1
+    private var backgroundColor: Int = 0
     var pagesLoaded = 1
     var totalPages = 1
 
@@ -71,6 +73,7 @@ class CommentsActivity : AppCompatActivity() {
             finish()
         }
         this.mediaId = mediaId
+        backgroundColor = (binding.root.background as? ColorDrawable)?.color ?: 0
 
         val markwon = buildMarkwon()
 
@@ -131,8 +134,13 @@ class CommentsActivity : AppCompatActivity() {
 
         var isFetching = false
         //if we have scrolled to the bottom of the list, load more comments
-        binding.commentsList.addOnScrollListener(object : androidx.recyclerview.widget.RecyclerView.OnScrollListener() {
+        binding.commentsList.addOnScrollListener(object :
-            override fun onScrolled(recyclerView: androidx.recyclerview.widget.RecyclerView, dx: Int, dy: Int) {
+            androidx.recyclerview.widget.RecyclerView.OnScrollListener() {
+            override fun onScrolled(
+                recyclerView: androidx.recyclerview.widget.RecyclerView,
+                dx: Int,
+                dy: Int
+            ) {
                 super.onScrolled(recyclerView, dx, dy)
                 if (shouldLoadMoreComments(recyclerView)) {
                     loadMoreComments()
@@ -164,7 +172,15 @@ class CommentsActivity : AppCompatActivity() {
 
             private suspend fun updateUIWithComment(comment: Comment) {
                 withContext(Dispatchers.Main) {
-                    section.add(CommentItem(comment, buildMarkwon(), section, this@CommentsActivity))
+                    section.add(
+                        CommentItem(
+                            comment,
+                            buildMarkwon(),
+                            section,
+                            this@CommentsActivity,
+                            backgroundColor
+                        )
+                    )
                 }
             }
         })
@@ -215,7 +231,15 @@ class CommentsActivity : AppCompatActivity() {
         val sortedComments = sortComments(comments?.comments)
         sortedComments.forEach {
             withContext(Dispatchers.Main) {
-                section.add(CommentItem(it, buildMarkwon(), section, this@CommentsActivity))
+                section.add(
+                    CommentItem(
+                        it,
+                        buildMarkwon(),
+                        section,
+                        this@CommentsActivity,
+                        backgroundColor
+                    )
+                )
             }
         }
 
@@ -309,7 +333,9 @@ class CommentsActivity : AppCompatActivity() {
                         it,
                         buildMarkwon(),
                         comment.repliesSection,
-                        this@CommentsActivity)
+                        this@CommentsActivity,
+                        backgroundColor
+                    )
                 )
             }
         }
@@ -366,7 +392,9 @@ class CommentsActivity : AppCompatActivity() {
 
     private suspend fun handleEditComment(commentText: String) {
         val success = withContext(Dispatchers.IO) {
-            CommentsAPI.editComment(commentWithInteraction?.comment?.commentId ?: return@withContext false, commentText)
+            CommentsAPI.editComment(
+                commentWithInteraction?.comment?.commentId ?: return@withContext false, commentText
+            )
         }
         if (success) {
             updateCommentInSection(commentText)
@@ -403,12 +431,18 @@ class CommentsActivity : AppCompatActivity() {
             if (interactionState == InteractionState.REPLY) {
                 commentWithInteraction?.repliesSection?.add(
                     0,
-                    CommentItem(it, buildMarkwon(), commentWithInteraction!!.repliesSection, this@CommentsActivity)
+                    CommentItem(
+                        it,
+                        buildMarkwon(),
+                        commentWithInteraction!!.repliesSection,
+                        this@CommentsActivity,
+                        backgroundColor
+                    )
                 )
             } else {
                 section.add(
                     0,
-                    CommentItem(it, buildMarkwon(), section, this@CommentsActivity)
+                    CommentItem(it, buildMarkwon(), section, this@CommentsActivity, backgroundColor)
                 )
             }
         }

app/src/main/res/layout/activity_comments.xml

@@ -5,6 +5,7 @@
     android:id="@+id/commentsLayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="?android:colorBackground"
     android:fitsSystemWindows="true">
 
     <LinearLayout