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[Woo POS] Extract items code from aggregate model (#14498)
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97 changes: 97 additions & 0 deletions
97
WooCommerce/Classes/POS/Services/PointOfSaleItemsService.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| import Foundation | ||
| import Combine | ||
| import protocol Yosemite.POSItem | ||
| import protocol Yosemite.POSItemProvider | ||
| import enum Yosemite.POSProductProviderError | ||
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|
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| protocol PointOfSaleItemsServiceProtocol { | ||
| var itemListStatePublisher: any Publisher<ItemListState, Never> { get } | ||
| @available(*, deprecated, message: "allItems will be removed in a future release. Use itemListState's associated value instead") | ||
| var allItems: [POSItem] { get } | ||
| func loadInitialItems() async | ||
| func loadNextItems() async | ||
| func reload() async | ||
| } | ||
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| class PointOfSaleItemsService: PointOfSaleItemsServiceProtocol { | ||
| private(set) var itemListStatePublisher: any Publisher<ItemListState, Never> | ||
| private var itemListStateSubject: PassthroughSubject<ItemListState, Never> = .init() | ||
| private(set) var allItems: [POSItem] = [] | ||
| private var currentPage: Int = Constants.initialPage | ||
| private var mightHaveMorePages: Bool = true | ||
| private let itemProvider: POSItemProvider | ||
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| init(itemProvider: POSItemProvider) { | ||
| self.itemProvider = itemProvider | ||
| itemListStatePublisher = itemListStateSubject.eraseToAnyPublisher() | ||
| } | ||
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| @MainActor | ||
| func loadInitialItems() async { | ||
| mightHaveMorePages = true | ||
| itemListStateSubject.send(.initialLoading) | ||
| try? await load(pageNumber: Constants.initialPage) | ||
| } | ||
|
|
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| @MainActor | ||
| func loadNextItems() async { | ||
| do { | ||
| guard mightHaveMorePages else { | ||
| return | ||
| } | ||
| itemListStateSubject.send(.loading(allItems)) | ||
|
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| let nextPage = currentPage + 1 | ||
| try await load(pageNumber: nextPage) | ||
| currentPage = nextPage | ||
| } catch { | ||
| // Handle errors without incrementing currentPage. | ||
| } | ||
| } | ||
|
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||
| @MainActor | ||
| func reload() async { | ||
| allItems.removeAll() | ||
| currentPage = Constants.initialPage | ||
| mightHaveMorePages = true | ||
| itemListStateSubject.send(.loading(allItems)) | ||
| try? await load(pageNumber: currentPage) | ||
| } | ||
|
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| @MainActor | ||
| private func load(pageNumber: Int) async throws { | ||
| do { | ||
| try await fetchItems(pageNumber: pageNumber) | ||
| mightHaveMorePages = true | ||
| updateItemListStateAfterLoadAttempt() | ||
| } catch POSProductProviderError.pageOutOfRange { | ||
| mightHaveMorePages = false | ||
| updateItemListStateAfterLoadAttempt() | ||
| throw POSProductProviderError.pageOutOfRange | ||
| } catch { | ||
| itemListStateSubject.send(.error(PointOfSaleErrorState.errorOnLoadingProducts())) | ||
| throw error | ||
| } | ||
| } | ||
|
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| @MainActor | ||
| private func fetchItems(pageNumber: Int) async throws { | ||
| let newItems = try await itemProvider.providePointOfSaleItems(pageNumber: pageNumber) | ||
| let uniqueNewItems = newItems.filter { newItem in | ||
| !allItems.contains(where: { $0.productID == newItem.productID }) | ||
| } | ||
| allItems.append(contentsOf: uniqueNewItems) | ||
| } | ||
|
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| private func updateItemListStateAfterLoadAttempt() { | ||
| if allItems.isEmpty { | ||
| itemListStateSubject.send(.empty) | ||
| } else { | ||
| itemListStateSubject.send(.loaded(allItems)) | ||
| } | ||
| } | ||
|
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| private enum Constants { | ||
| static let initialPage: Int = 1 | ||
| } | ||
| } |
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