feat(messages): support forwarding to multiple chats

app/messages/service.py

@@ -10,6 +10,7 @@ from app.messages.models import Message
 from app.messages.spam_guard import enforce_message_spam_policy
 from app.messages.schemas import (
     MessageCreateRequest,
+    MessageForwardBulkRequest,
     MessageForwardRequest,
     MessageReactionRead,
     MessageReactionToggleRequest,
@@ -276,6 +277,49 @@ async def forward_message(
     return forwarded
 
 
+async def forward_message_bulk(
+    db: AsyncSession,
+    *,
+    source_message_id: int,
+    sender_id: int,
+    payload: MessageForwardBulkRequest,
+) -> list[Message]:
+    source = await repository.get_message_by_id(db, source_message_id)
+    if not source:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Source message not found")
+    await ensure_chat_membership(db, chat_id=source.chat_id, user_id=sender_id)
+
+    target_chat_ids = list(dict.fromkeys(payload.target_chat_ids))
+    if not target_chat_ids:
+        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="No target chats")
+
+    forwarded_messages: list[Message] = []
+    for target_chat_id in target_chat_ids:
+        await ensure_chat_membership(db, chat_id=target_chat_id, user_id=sender_id)
+        target_chat = await chats_repository.get_chat_by_id(db, target_chat_id)
+        if not target_chat:
+            continue
+        target_membership = await chats_repository.get_chat_member(db, chat_id=target_chat_id, user_id=sender_id)
+        if not target_membership:
+            continue
+        if target_chat.type == ChatType.CHANNEL and target_membership.role == ChatMemberRole.MEMBER:
+            continue
+        forwarded = await repository.create_message(
+            db,
+            chat_id=target_chat_id,
+            sender_id=sender_id,
+            reply_to_message_id=None,
+            forwarded_from_message_id=source.id,
+            message_type=source.type,
+            text=source.text,
+        )
+        forwarded_messages.append(forwarded)
+    await db.commit()
+    for message in forwarded_messages:
+        await db.refresh(message)
+    return forwarded_messages
+
+
 async def list_message_reactions(
     db: AsyncSession,
     *,