feat(home): 팔로잉 탭 API 상태를 추가한다

SodaLive/Sources/V2/Main/Home/Following/MainHomeFollowingViewModel.swift

@@ -0,0 +1,73 @@
+import Foundation
+import Combine
+
+final class MainHomeFollowingViewModel: ObservableObject {
+    private let repository = MainHomeFollowingRepository()
+    private var subscription = Set<AnyCancellable>()
+
+    @Published var isLoading = false
+    @Published var response: HomeFollowingTabResponse?
+    @Published var isLoginRequired = false
+    @Published var message = ""
+    @Published var hasLoaded = false
+
+    func fetchFollowing() {
+        isLoading = true
+        message = ""
+
+        repository.getFollowing()
+            .sink { [weak self] result in
+                guard let self else { return }
+
+                switch result {
+                case .finished:
+                    DEBUG_LOG("finish")
+                case .failure(let error):
+                    ERROR_LOG(error.localizedDescription)
+                    self.response = nil
+                    self.isLoginRequired = false
+                    self.message = I18n.HomeFollowing.loadFailedMessage
+                    self.hasLoaded = true
+                    self.isLoading = false
+                }
+            } receiveValue: { [weak self] response in
+                guard let self else { return }
+
+                let responseData = response.data
+
+                do {
+                    let jsonDecoder = JSONDecoder()
+                    let decoded = try jsonDecoder.decode(ApiResponse<HomeFollowingTabResponse>.self, from: responseData)
+
+                    if let data = decoded.data, decoded.success {
+                        self.isLoginRequired = data.isLoginRequired
+                        self.response = data.isLoginRequired ? nil : data
+                        self.message = data.isLoginRequired || data.hasContent ? "" : I18n.HomeFollowing.emptyStateMessage
+                    } else {
+                        self.response = nil
+                        self.isLoginRequired = false
+                        self.message = I18n.HomeFollowing.loadFailedMessage
+                    }
+                } catch {
+                    ERROR_LOG(error.localizedDescription)
+                    self.response = nil
+                    self.isLoginRequired = false
+                    self.message = I18n.HomeFollowing.loadFailedMessage
+                }
+
+                self.hasLoaded = true
+                self.isLoading = false
+            }
+            .store(in: &subscription)
+    }
+}
+
+private extension HomeFollowingTabResponse {
+    var hasContent: Bool {
+        !followingCreators.isEmpty ||
+        !onAirLives.isEmpty ||
+        !recentChats.isEmpty ||
+        !monthlySchedules.isEmpty ||
+        !recentNews.isEmpty
+    }
+}