feat(creator): 오디오 탭을 추가한다

SodaLive/Sources/V2/CreatorChannel/Audio/CreatorChannelAudioViewModel.swift

@@ -0,0 +1,173 @@
+import Foundation
+import Combine
+
+struct CreatorChannelAudioThemeItem: Hashable {
+    let themeId: Int?
+    let themeName: String
+}
+
+final class CreatorChannelAudioViewModel: ObservableObject {
+    private let repository = CreatorChannelAudioRepository()
+    private var subscription = Set<AnyCancellable>()
+    private let pageSize = 20
+    private var latestRequestId = 0
+
+    @Published var isLoading = false
+    @Published var isLoadingNextPage = false
+    @Published var response: CreatorChannelAudioTabResponse?
+    @Published var audioContents = [CreatorChannelAudioContentResponse]()
+    @Published var selectedSort: ContentSort = .latest
+    @Published var selectedTheme = CreatorChannelAudioThemeItem.all
+    @Published var page = 0
+    @Published var size = 20
+    @Published var hasNext = false
+    @Published var hasLoaded = false
+    @Published var errorMessage = ""
+    @Published var isShowPopup = false
+
+    var displayThemes: [CreatorChannelAudioThemeItem] {
+        let themes = response?.themes.map {
+            CreatorChannelAudioThemeItem(themeId: $0.themeId, themeName: $0.themeName)
+        } ?? []
+
+        return [CreatorChannelAudioThemeItem.all] + themes
+    }
+
+    var isAllThemeSelected: Bool {
+        selectedTheme.themeId == nil
+    }
+
+    func fetchFirstPage(creatorId: Int) {
+        fetchAudio(creatorId: creatorId, page: 0, isNextPage: false)
+    }
+
+    func fetchNextPageIfNeeded(creatorId: Int, currentItem: CreatorChannelAudioContentResponse) {
+        guard audioContents.last?.audioContentId == currentItem.audioContentId else { return }
+        guard hasNext, isLoadingNextPage == false, isLoading == false else { return }
+
+        fetchAudio(creatorId: creatorId, page: page + 1, isNextPage: true)
+    }
+
+    func selectSort(_ sort: ContentSort, creatorId: Int) {
+        guard selectedSort != sort else { return }
+
+        selectedSort = sort
+        fetchFirstPage(creatorId: creatorId)
+    }
+
+    func selectTheme(_ theme: CreatorChannelAudioThemeItem, creatorId: Int) {
+        guard selectedTheme != theme else { return }
+
+        selectedTheme = theme
+        fetchFirstPage(creatorId: creatorId)
+    }
+
+    private func fetchAudio(creatorId: Int, page requestPage: Int, isNextPage: Bool) {
+        latestRequestId += 1
+        let requestId = latestRequestId
+
+        if isNextPage {
+            isLoadingNextPage = true
+        } else {
+            isLoading = true
+        }
+
+        repository.getAudio(
+            creatorId: creatorId,
+            page: requestPage,
+            size: pageSize,
+            sort: selectedSort,
+            themeId: selectedTheme.themeId
+        )
+        .sink { [weak self] result in
+            guard let self else { return }
+            guard requestId == self.latestRequestId else { return }
+
+            switch result {
+            case .finished:
+                DEBUG_LOG("finish")
+            case .failure(let error):
+                ERROR_LOG(error.localizedDescription)
+                self.applyFailureState()
+            }
+        } receiveValue: { [weak self] response in
+            guard let self else { return }
+            guard requestId == self.latestRequestId else { return }
+
+            var shouldFetchNextPage = false
+
+            do {
+                let jsonDecoder = JSONDecoder()
+                let decoded = try jsonDecoder.decode(ApiResponse<CreatorChannelAudioTabResponse>.self, from: response.data)
+
+                if let data = decoded.data, decoded.success {
+                    shouldFetchNextPage = self.applySuccessState(data, isNextPage: isNextPage)
+                } else {
+                    self.errorMessage = decoded.message ?? I18n.Common.commonError
+                    self.isShowPopup = true
+                }
+            } catch {
+                ERROR_LOG(error.localizedDescription)
+                self.errorMessage = I18n.Common.commonError
+                self.isShowPopup = true
+            }
+
+            self.hasLoaded = true
+            self.isLoading = false
+            self.isLoadingNextPage = false
+
+            if shouldFetchNextPage {
+                self.fetchAudio(creatorId: creatorId, page: self.page + 1, isNextPage: true)
+            }
+        }
+        .store(in: &subscription)
+    }
+
+    private func applySuccessState(_ data: CreatorChannelAudioTabResponse, isNextPage: Bool) -> Bool {
+        response = data
+        selectedSort = data.sort
+        selectedTheme = selectedTheme(from: data)
+        page = data.page
+        size = data.size
+        hasNext = data.hasNext
+
+        let visibleAudioContents = data.audioContents.filter {
+            guard let duration = $0.duration?.trimmingCharacters(in: .whitespacesAndNewlines) else { return false }
+            return duration.isEmpty == false
+        }
+
+        if isNextPage {
+            audioContents.append(contentsOf: visibleAudioContents)
+        } else {
+            audioContents = visibleAudioContents
+        }
+
+        return visibleAudioContents.isEmpty && data.hasNext
+    }
+
+    private func selectedTheme(from data: CreatorChannelAudioTabResponse) -> CreatorChannelAudioThemeItem {
+        guard let themeId = data.themeId else {
+            return .all
+        }
+
+        if let theme = data.themes.first(where: { $0.themeId == themeId }) {
+            return CreatorChannelAudioThemeItem(themeId: theme.themeId, themeName: theme.themeName)
+        }
+
+        return CreatorChannelAudioThemeItem(themeId: themeId, themeName: selectedTheme.themeName)
+    }
+
+    private func applyFailureState() {
+        errorMessage = I18n.Common.commonError
+        isShowPopup = true
+        hasLoaded = true
+        isLoading = false
+        isLoadingNextPage = false
+    }
+}
+
+private extension CreatorChannelAudioThemeItem {
+    static var all: CreatorChannelAudioThemeItem {
+        CreatorChannelAudioThemeItem(themeId: nil, themeName: I18n.CreatorChannelAudio.totalLabel)
+    }
+}