feat(chat-room-bg): 배경 이미지 변경 기능 추가

SodaLive/Sources/Chat/Talk/Room/ChatRoomViewModel.swift

@@ -16,6 +16,8 @@ final class ChatRoomViewModel: ObservableObject {
     @Published var errorMessage: String = ""
     @Published var isShowPopup = false
     
+    @Published var chatRoomBgImageId: Int = 0
+    @Published private(set) var characterId: Int64 = 0
     @Published private(set) var characterProfileUrl: String = ""
     @Published private(set) var characterName: String = "Character Name"
     @Published private(set) var characterType: CharacterType = .Character
@@ -135,10 +137,11 @@ final class ChatRoomViewModel: ObservableObject {
         isLoading = true
         self.roomId = roomId
         self.isHideBg = UserDefaults.standard.bool(forKey: bgHideKey())
+        self.chatRoomBgImageId = getSavedBackgroundImageId() ?? 0
         
         repository.enterChatRoom(
             roomId: roomId,
-            characterImageId: getSavedBackgroundImageId()
+            characterImageId: self.chatRoomBgImageId
         )
         .sink { result in
             switch result {
@@ -155,6 +158,7 @@ final class ChatRoomViewModel: ObservableObject {
                 let decoded = try jsonDecoder.decode(ApiResponse<ChatRoomEnterResponse>.self, from: responseData)
                 
                 if let data = decoded.data, decoded.success {
+                    self?.characterId = data.character.characterId
                     self?.characterName = data.character.name
                     self?.characterType = data.character.characterType
                     self?.characterProfileUrl = data.character.profileImageUrl
@@ -352,6 +356,12 @@ final class ChatRoomViewModel: ObservableObject {
         }
     }
     
+    func setBackgroundImage(imageItem: CharacterImageListItemResponse) {
+        UserDefaults.standard.set(imageItem.id, forKey: bgImageIdKey())
+        chatRoomBgImageUrl = imageItem.imageUrl
+        chatRoomBgImageId = imageItem.id
+    }
+    
     private func resetData() {
         characterProfileUrl = ""
         characterName = "Character Name"