From b62ff7d7c4cc30ed06210b5c717dccc9a20be024 Mon Sep 17 00:00:00 2001
From: k1ngsterr1 <ruslanmakhmatov@gmail.com>
Date: Sat, 7 Mar 2026 17:15:25 +0500
Subject: [PATCH] =?UTF-8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB=D0=B5?=
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---
 .../messenger/ui/chats/ChatDetailScreen.kt    | 67 +++++++++++++++++--
 1 file changed, 63 insertions(+), 4 deletions(-)

diff --git a/app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt b/app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt
index 82c4223..6904e51 100644
--- a/app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt
+++ b/app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt
@@ -8,6 +8,7 @@ import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.Crossfade
 import androidx.compose.animation.core.Spring
 import androidx.compose.animation.core.animateDpAsState
@@ -721,6 +722,15 @@ fun ChatDetailScreen(
                         .maxWithOrNull(compareBy<ChatMessage>({ it.timestamp.time }, { it.id }))
                         ?.id
         var lastNewestMessageId by remember { mutableStateOf<String?>(null) }
+        val isAtBottom by remember(listState) {
+                derivedStateOf {
+                        listState.firstVisibleItemIndex == 0 &&
+                                listState.firstVisibleItemScrollOffset <= 12
+                }
+        }
+        val showScrollToBottomButton by remember(messagesWithDates, isAtBottom) {
+                derivedStateOf { messagesWithDates.isNotEmpty() && !isAtBottom }
+        }
 
         // Telegram-style: Прокрутка ТОЛЬКО при новых сообщениях (не при пагинации)
         // 🔥 Скроллим только если изменился ID самого нового сообщения
@@ -730,10 +740,15 @@ fun ChatDetailScreen(
                                 lastNewestMessageId != null &&
                                 newestMessageId != lastNewestMessageId
                 ) {
-                        // Новое сообщение пришло - скроллим вниз
-                        delay(50) // Debounce - ждём стабилизации
-                        listState.animateScrollToItem(0)
-                        wasManualScroll = false
+                        val newestMessage = messages.firstOrNull { it.id == newestMessageId }
+                        val isOwnOutgoingMessage = newestMessage?.isOutgoing == true
+                        val shouldAutoScroll = isAtBottom || isOwnOutgoingMessage
+
+                        if (shouldAutoScroll) {
+                                delay(50) // Debounce - ждём стабилизации
+                                listState.animateScrollToItem(0)
+                                wasManualScroll = false
+                        }
                 }
                 lastNewestMessageId = newestMessageId
         }
@@ -2465,6 +2480,50 @@ fun ChatDetailScreen(
                                 }
                         } // Конец Column внутри Scaffold content
 
+                        AnimatedVisibility(
+                                visible = showScrollToBottomButton && !isLoading && !isSelectionMode,
+                                enter = fadeIn(animationSpec = tween(140)) + expandVertically(expandFrom = Alignment.Bottom),
+                                exit = fadeOut(animationSpec = tween(120)) + shrinkVertically(shrinkTowards = Alignment.Bottom),
+                                modifier =
+                                        Modifier.align(Alignment.BottomEnd)
+                                                .padding(
+                                                        end = 14.dp,
+                                                        bottom = if (isSystemAccount) 24.dp else 86.dp
+                                                )
+                        ) {
+                                Box(
+                                        modifier =
+                                                Modifier.size(38.dp)
+                                                        .clip(CircleShape)
+                                                        .background(
+                                                                if (isDarkTheme) Color(0xFF2D2E31)
+                                                                else Color.White
+                                                        )
+                                                        .clickable(
+                                                                indication = null,
+                                                                interactionSource =
+                                                                        remember {
+                                                                                MutableInteractionSource()
+                                                                        }
+                                                        ) {
+                                                                scope.launch {
+                                                                        listState.animateScrollToItem(0)
+                                                                        wasManualScroll = false
+                                                                }
+                                                        },
+                                        contentAlignment = Alignment.Center
+                                ) {
+                                        Icon(
+                                                imageVector = TablerIcons.ChevronDown,
+                                                contentDescription = "Scroll to bottom",
+                                                tint =
+                                                        if (isDarkTheme) Color(0xFFF2F2F3)
+                                                        else Color(0xFF2D3138),
+                                                modifier = Modifier.size(21.dp)
+                                        )
+                                }
+                        }
+
                         // 📎 Media Picker — new tab-based ChatAttachAlert (Telegram-style)
                         // Feature flag: set USE_NEW_ATTACH_ALERT to false to use old MediaPickerBottomSheet
                         val USE_NEW_ATTACH_ALERT = true