modify DisplayUtils and MessageUtils

Signed-off-by: sowjanyakch <sowjanya.kch@gmail.com>

app/src/main/java/com/nextcloud/talk/utils/DisplayUtils.kt

@@ -23,6 +23,7 @@ import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.text.Spannable
 import android.text.SpannableString
+import android.text.SpannableStringBuilder
 import android.text.Spanned
 import android.text.TextPaint
 import android.text.TextUtils
@@ -224,6 +225,28 @@ object DisplayUtils {
         return chip
     }
 
+     fun replaceLabelWithPlaceholder(
+        text: Spanned,
+        labelToSearch: String,
+        placeholder: String
+    ): Spannable {
+        val spannableStringBuilder = SpannableStringBuilder(text)
+        val stringText = text.toString()
+        val m = Pattern.compile(
+            Pattern.quote(labelToSearch),
+            Pattern.CASE_INSENSITIVE or Pattern.LITERAL or Pattern.MULTILINE
+        )
+            .matcher(spannableStringBuilder)
+        var lastStartIndex = 0
+        while (m.find()) {
+            val start = stringText.indexOf(m.group(), lastStartIndex)
+            val end = start + m.group().length
+            lastStartIndex = end
+            spannableStringBuilder.replace(start, end, placeholder)
+        }
+        return spannableStringBuilder
+    }
+
     fun searchAndReplaceWithMentionSpan(
         key: String,
         context: Context,

app/src/main/java/com/nextcloud/talk/utils/message/MessageUtils.kt

@@ -118,6 +118,19 @@ class MessageUtils(val context: Context) {
                         } else {
                             individualHashMap["id"]
                         }
+                        val label = individualHashMap["name"]!!
+                        val type = individualHashMap["type"]!!
+                        val labelToSearch = if (type == "circle") {
+                            "@team/$label"
+                        } else {
+                            "@$label"
+                        }
+
+                        messageStringInternal = DisplayUtils.replaceLabelWithPlaceholder(
+                            messageStringInternal,
+                            labelToSearch,
+                            PLACEHOLDER
+                        )
 
                         messageStringInternal = DisplayUtils.searchAndReplaceWithMentionSpan(
                             key!!,
@@ -169,5 +182,6 @@ class MessageUtils(val context: Context) {
         private const val TAG = "MessageUtils"
         const val MAX_REPLY_LENGTH = 250
         const val HTTPS_PROTOCOL = "https://"
+        const val PLACEHOLDER = "[mention]"
     }
 }