feat: 首页改为落地页并接入登录态

IosClientKit/Sources/FeatureHome/HomeViewModel.swift

@@ -8,24 +8,47 @@ public final class HomeViewModel {
     public private(set) var uiState: HomeUiState = .loading
 
     private let homeUseCase: HomeUseCase
+    private let sessionUseCase: SessionUseCase
     private var loadTask: Task<Void, Never>?
+    private var dataTask: Task<Void, Never>?
 
-    public init(homeUseCase: HomeUseCase) {
+    public init(homeUseCase: HomeUseCase, sessionUseCase: SessionUseCase) {
         self.homeUseCase = homeUseCase
+        self.sessionUseCase = sessionUseCase
     }
 
     public func load() {
-        // flatMapLatest 的等价：新 load 前先取消旧的观察。
+        // flatMapLatest 的等价：登录态变化时重新订阅对应数据源。
         loadTask?.cancel()
         loadTask = Task { [weak self] in
             guard let self else { return }
-            self.uiState = .loading
             do {
-                for try await data in self.homeUseCase.observeHome() {
-                    self.uiState = data.habits.isEmpty ? .empty : .success(data)
+                for try await isLoggedIn in self.sessionUseCase.observeIsLoggedIn() {
+                    self.reload(isLoggedIn: isLoggedIn)
+                }
+            } catch is CancellationError {
+            } catch {
+                self.uiState = .error(error.localizedDescription)
+            }
+        }
+    }
+
+    private func reload(isLoggedIn: Bool) {
+        dataTask?.cancel()
+        uiState = .loading
+        dataTask = Task { [weak self] in
+            guard let self else { return }
+            do {
+                if isLoggedIn {
+                    for try await data in self.homeUseCase.observeHome() {
+                        self.uiState = .success(data, isGuest: false)
+                    }
+                } else {
+                    for try await data in self.homeUseCase.observeGuestHome() {
+                        self.uiState = .success(data, isGuest: true)
+                    }
                 }
             } catch is CancellationError {
-                // 被更新的 load() 取代，保持当前状态即可。
             } catch {
                 self.uiState = .error(error.localizedDescription)
             }