feat: placements update

components/dialog-create-placements.tsx

@@ -78,6 +78,13 @@ export function CreatePlacementsDialog({
       .filter(Boolean)
   );
 
+  const getExistingChannelIdByUsername = (usernameLower: string): string | null => {
+    const matched = existingPlacements.find(
+      (p) => p.channel.username?.toLowerCase() === usernameLower
+    );
+    return matched?.channel.id ?? null;
+  };
+
   const handleOpenChange = (isOpen: boolean) => {
     if (!isOpen) {
       resetForm();
@@ -116,33 +123,43 @@ export function CreatePlacementsDialog({
     }
 
     const lowerUsername = username.toLowerCase();
-    if (existingUsernames.has(lowerUsername)) {
-      setError("Этот канал уже добавлен в проект");
-      return;
-    }
     if (selectedChannels.some((c) => c.username.toLowerCase() === lowerUsername)) {
       setError("Канал уже добавлен в список");
       return;
     }
 
-    // Look up channel by username to get channel_id
-    try {
-      const channelsResponse = await channelsApi.list({ username });
-      const channel = channelsResponse.items.find(
-        (c) => c.username?.toLowerCase() === lowerUsername
-      );
+    // If channel already has placements in this project, reuse its channel_id.
+    // Channels are global, so we don't need to create them again - we just need
+    // the channel_id to create a new placement for this channel.
+    if (existingUsernames.has(lowerUsername)) {
+      const existingChannelId = getExistingChannelIdByUsername(lowerUsername);
+      if (!existingChannelId) {
+        setError("Не удалось найти ID канала в проекте");
+        return;
+      }
+      setSelectedChannels([...selectedChannels, { username, channelId: existingChannelId }]);
+      setNewChannelInput("");
+      setError(null);
+      return;
+    }
 
-      if (!channel) {
-        setError("Канал не найден в каталоге");
+    // Channel doesn't exist in project yet. Create it globally via API to get channel_id.
+    // If channel already exists globally, API will return existing channel.
+    try {
+      const createResponse = await channelsApi.create([{ username }]);
+      const channelId = createResponse.results[0]?.channel.id;
+
+      if (!channelId) {
+        setError("Не удалось получить ID канала");
         return;
       }
 
-      setSelectedChannels([...selectedChannels, { username, channelId: channel.id }]);
+      setSelectedChannels([...selectedChannels, { username, channelId }]);
       setNewChannelInput("");
       setError(null);
     } catch (err) {
-      console.error("Failed to look up channel:", err);
-      setError("Не удалось найти канал");
+      console.error("Failed to create channel:", err);
+      setError("Не удалось создать канал");
     }
   };