[BOOK-421] fix: Emotion Edit 로직 수정

Author: doyeonk429

src/Projects/BKDomain/Sources/Entity/Emotion.swift

@@ -1,6 +1,6 @@
 // Copyright © 2025 Booket. All rights reserved
 
-public enum Emotion: String, CaseIterable, Decodable {
+public enum Emotion: String, CaseIterable, Decodable, Equatable {
     case warmth = "따뜻함"
     case joy = "즐거움"
     case sad = "슬픔"

src/Projects/BKPresentation/Sources/MainFlow/NoteEdit/View/EmotionEditView.swift

@@ -6,23 +6,21 @@ import Combine
 import UIKit
 import SnapKit
 
+enum EmotionEditViewEvent {
+    case editButtonTapped
+    case emotionDidChange(Emotion?)
+}
+
 final class EmotionEditView: BaseView {
     private let scrollView = UIScrollView()
     private let contentView = UIView()
     private let emotionRegistrationView = EmotionRegistrationView()
     private let editButton = BKButton(style: .primary, size: .large)
 
-    private let editButtonTappedSubject = PassthroughSubject<Void, Never>()
-    var editButtonTappedPublisher: AnyPublisher<Void, Never> {
-        editButtonTappedSubject.eraseToAnyPublisher()
-    }
-    
-    private let getCurrentEmotionSubject = PassthroughSubject<Void, Never>()
-    var getCurrentEmotionPublisher: AnyPublisher<Void, Never> {
-        getCurrentEmotionSubject.eraseToAnyPublisher()
-    }
+    let eventPublisher = PassthroughSubject<EmotionEditViewEvent, Never>()
+    private var cancellables = Set<AnyCancellable>()
 
-    var selectedEmotion: Emotion? {
+    private var currentSelectedEmotion: Emotion? {
         guard let form = emotionRegistrationView.registrationForm(),
               case .emotion(let emotionForm) = form else { return nil }
         return emotionForm.emotion
@@ -37,6 +35,15 @@ final class EmotionEditView: BaseView {
     override func configure() {
         editButton.title = "수정하기"
         editButton.addTarget(self, action: #selector(editButtonTapped), for: .touchUpInside)
+        
+        emotionRegistrationView.inputChangedPublisher
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+    
+                let newEmotion = self.currentSelectedEmotion
+                self.eventPublisher.send(.emotionDidChange(newEmotion))
+            }
+            .store(in: &cancellables)
     }
 
     override func setupLayout() {
@@ -69,12 +76,12 @@ final class EmotionEditView: BaseView {
         emotionRegistrationView.setSelectedEmotion(emotion)
     }
 
-    func getCurrentSelectedEmotion() {
-        getCurrentEmotionSubject.send(())
+    @objc private func editButtonTapped() {
+        eventPublisher.send(.editButtonTapped)
     }
 
-    @objc private func editButtonTapped() {
-        editButtonTappedSubject.send(())
+    func setEditButtonEnabled(_ isEnabled: Bool) {
+        editButton.isDisabled = !isEnabled
     }
 }
 

src/Projects/BKPresentation/Sources/MainFlow/NoteEdit/View/EmotionEditViewController.swift

@@ -16,30 +16,41 @@ final class EmotionEditViewController: BaseViewController<EmotionEditView> {
     weak var coordinator: NoteEditCoordinator?
     private var cancellables = Set<AnyCancellable>()
 
-    private let currentEmotion: Emotion?
+    private let initialEmotion: Emotion?
+    @Published private var selectedEmotion: Emotion?
     private let completion: (Emotion) -> Void
 
     init(currentEmotion: Emotion?, completion: @escaping (Emotion) -> Void) {
-        self.currentEmotion = currentEmotion
+        self.initialEmotion = currentEmotion
         self.completion = completion
+        self._selectedEmotion = .init(initialValue: currentEmotion)
         super.init()
     }
 
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
 
-        // 현재 선택된 감정이 있으면 초기 설정
-        if let emotion = currentEmotion {
+        if let emotion = initialEmotion {
             contentView.setSelectedEmotion(emotion)
         }
+        contentView.setEditButtonEnabled(false)
     }
 
     override func bindAction() {
-        contentView.editButtonTappedPublisher
-            .compactMap { [weak self] in self?.contentView.selectedEmotion }
-            .sink { [weak self] selectedEmotion in
-                self?.completion(selectedEmotion)
-                self?.navigationController?.popViewController(animated: true)
+        contentView.eventPublisher
+            .sink { [weak self] event in
+                guard let self = self else { return }
+                switch event {
+                case .emotionDidChange(let newEmotion):
+                    self.selectedEmotion = newEmotion
+                    let isDiff = (newEmotion != self.initialEmotion)
+                    self.contentView.setEditButtonEnabled(isDiff)
+                case .editButtonTapped:
+                    if let emotion = self.selectedEmotion {
+                        self.completion(emotion)
+                        self.navigationController?.popViewController(animated: true)
+                    }
+                }
             }
             .store(in: &cancellables)
     }