[ITDS-75] feat: #61 - "추천 공고 관리" + "공고 검색" 데이터 Stream 구현

Targets/PresentationLayer/Sources/PostRecommend/RecommendedPostStream.swift

@@ -0,0 +1,64 @@
+//
+//  RecommendedPostStream.swift
+//  PresentationLayer
+//
+//  Created by 이원빈 on 2/12/25.
+//  Copyright © 2025 MOZIP. All rights reserved.
+//
+
+import Foundation
+import DomainLayer
+
+import RxCocoa
+
+public protocol RecommendedPostStream {
+  var data: BehaviorRelay<[RecommendCellData]> { get set }
+  var targetIndex: Int { get set }
+}
+
+public protocol MutableRecommendedPostStream: RecommendedPostStream {
+  func setTargetIndex(_ index: Int)
+  func updatePostInfo(id: Int, subTitle: String)
+  func updatePostImage(_ imageData: Data)
+  func updateAllPost(posts: [RecommendCellData])
+}
+
+final class MutableRecommendedPostStreamImpl: MutableRecommendedPostStream {
+
+  var data: BehaviorRelay<[RecommendCellData]> = .init(
+    value: RecommendCellData.initialData
+  )
+  var targetIndex: Int = 0
+
+  func setTargetIndex(_ index: Int) {
+    targetIndex = index
+  }
+
+  func updatePostInfo(id: Int, subTitle: String) {
+    var currentList = data.value
+    var targetPost = currentList[targetIndex]
+    targetPost.infoID = id
+    targetPost.subTitle = subTitle
+    currentList[targetIndex] = targetPost
+    data.accept(currentList)
+  }
+
+  func updatePostImage(_ imageData: Data) {
+    var currentList = data.value
+    var targetPost = currentList[targetIndex]
+    targetPost.imageData = imageData
+    currentList[targetIndex] = targetPost
+    data.accept(currentList)
+  }
+
+  func updateAllPost(posts: [RecommendCellData]) {
+    var currentList = data.value
+    currentList.enumerated().forEach { (i, item) in
+      currentList[i].infoID = posts[i].infoID
+      currentList[i].subTitle = posts[i].subTitle
+      currentList[i].thumbnailURL = posts[i].thumbnailURL
+      currentList[i].imageData = posts[i].imageData
+    }
+    data.accept(currentList)
+  }
+}