119 lines
3.8 KiB
Swift
119 lines
3.8 KiB
Swift
import Foundation
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import Combine
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final class ContentOverviewViewModel: ObservableObject {
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private let repository = ContentOverviewRepository()
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private var subscription = Set<AnyCancellable>()
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private let pageSize = 20
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private var latestRequestId = 0
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let type: ContentOverviewType
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@Published var items = [ContentOverviewItemResponse]()
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@Published var page = 0
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@Published var size = 20
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@Published var hasNext = false
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@Published var hasLoaded = false
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@Published var isLoading = false
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@Published var isLoadingNextPage = false
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@Published var errorMessage = ""
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@Published var isShowPopup = false
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var shouldShowEmptyState: Bool {
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hasLoaded && !isLoading && items.isEmpty
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}
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init(type: ContentOverviewType = .newAndHotAudio) {
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self.type = type
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}
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func fetchFirstPageIfNeeded() {
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guard !hasLoaded else { return }
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fetchFirstPage()
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}
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func fetchFirstPage() {
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fetchContents(page: 0, isNextPage: false)
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}
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func fetchNextPageIfNeeded(currentItem: ContentOverviewItemResponse) {
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guard items.last?.contentId == currentItem.contentId else { return }
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fetchNextPageIfPossible()
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}
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private func fetchNextPageIfPossible() {
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guard hasNext, isLoading == false, isLoadingNextPage == false else { return }
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fetchContents(page: page + 1, isNextPage: true)
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}
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private func fetchContents(page requestPage: Int, isNextPage: Bool) {
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latestRequestId += 1
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let requestId = latestRequestId
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if isNextPage {
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isLoadingNextPage = true
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} else {
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isLoading = true
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}
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repository.getContents(type: type, page: requestPage, size: pageSize)
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.sink { [weak self] result in
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guard let self else { return }
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guard requestId == self.latestRequestId else { return }
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switch result {
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case .finished:
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DEBUG_LOG("finish")
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case .failure(let error):
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ERROR_LOG(error.localizedDescription)
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self.applyFailureState()
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}
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} receiveValue: { [weak self] response in
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guard let self else { return }
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guard requestId == self.latestRequestId else { return }
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do {
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let jsonDecoder = JSONDecoder()
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let decoded = try jsonDecoder.decode(ApiResponse<ContentOverviewPageResponse>.self, from: response.data)
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if let data = decoded.data, decoded.success {
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self.applySuccessState(data, isNextPage: isNextPage)
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} else {
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self.errorMessage = decoded.message ?? I18n.MainContentAll.loadFailedMessage
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self.isShowPopup = true
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}
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} catch {
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ERROR_LOG(error.localizedDescription)
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self.errorMessage = I18n.MainContentAll.loadFailedMessage
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self.isShowPopup = true
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}
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self.hasLoaded = true
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self.isLoading = false
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self.isLoadingNextPage = false
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}
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.store(in: &subscription)
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}
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private func applySuccessState(_ data: ContentOverviewPageResponse, isNextPage: Bool) {
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page = data.page
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size = data.size
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hasNext = data.hasNext
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errorMessage = ""
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if isNextPage {
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items.append(contentsOf: data.items)
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} else {
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items = data.items
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}
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}
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private func applyFailureState() {
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errorMessage = I18n.MainContentAll.loadFailedMessage
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isShowPopup = true
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hasLoaded = true
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isLoading = false
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isLoadingNextPage = false
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}
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}
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