chore(chat): add separator config for "continous" grouping; ignoring granularity with TimeGap (#954)

Signed-off-by: Brandon McAnsh <git@bmcreations.dev>

Author: bmc08gt

apps/flipcash/features/messenger/src/main/kotlin/com/flipcash/app/messenger/internal/ChatViewModel.kt

@@ -161,7 +161,7 @@ internal class ChatViewModel @Inject constructor(
         data class ChatDeactivated(val isReadOnly: Boolean) : Event
     }
 
-    private val separatorConfig = SeparatorConfig.TimeGap()
+    private val separatorConfig = SeparatorConfig.Continuous()
 
     @OptIn(ExperimentalCoroutinesApi::class)
     private val messageStream = stateFlow.mapNotNull { it.chatId }

apps/flipcash/shared/chat-ui/src/main/kotlin/com/flipcash/shared/chat/ui/SeparatorConfig.kt

@@ -27,4 +27,14 @@ sealed interface SeparatorConfig {
             before.toLocalDate() != after.toLocalDate()
                     || (before - after).absoluteValue > gap
     }
+
+    data class Continuous(
+        val gap: Duration = 3.hours,
+    ) : SeparatorConfig {
+        override val groupingWindow: Duration = Duration.INFINITE
+        override fun shouldSeparate(before: Instant, after: Instant): Boolean =
+            before.toLocalDate() != after.toLocalDate()
+                    || (before - after).absoluteValue > gap
+        override fun isGrouped(a: Instant, b: Instant): Boolean = true
+    }
 }