Work in progress for #2184

Multiplatform/Shared/Add/AddFeedView.swift

@@ -0,0 +1,223 @@
+//
+//  AddFeedView.swift
+//  NetNewsWire
+//
+//  Created by Stuart Breckenridge on 3/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import SwiftUI
+import Account
+import RSCore
+import Combine
+
+fileprivate enum AddFeedError: LocalizedError {
+	
+	case none, alreadySubscribed, initialDownload, noFeeds
+	
+	var errorDescription: String? {
+		switch self {
+		case .alreadySubscribed:
+			return NSLocalizedString("Can’t add this feed because you’ve already subscribed to it.", comment: "Feed finder")
+		case .initialDownload:
+			return NSLocalizedString("Can’t add this feed because of a download error.", comment: "Feed finder")
+		case .noFeeds:
+			return NSLocalizedString("Can’t add a feed because no feed was found.", comment: "Feed finder")
+		default:
+			return nil
+		}
+	}
+	
+}
+
+fileprivate class AddFeedViewModel: ObservableObject {
+	
+	@Published var providedURL: String = ""
+	@Published var providedName: String = ""
+	@Published var selectedFolderIndex: Int = 0
+	@Published var addFeedError: AddFeedError? {
+		didSet {
+			addFeedError != .none ? (showError = true) : (showError = false)
+		}
+	}
+	@Published var showError: Bool = false
+	@Published var containers: [Container] = []
+	@Published var showProgressIndicator: Bool = false
+	
+	init() {
+		for account in AccountManager.shared.sortedActiveAccounts {
+			containers.append(account)
+			if let sortedFolders = account.sortedFolders {
+				containers.append(contentsOf: sortedFolders)
+			}
+		}
+	}
+	
+}
+
+struct AddFeedView: View {
+	
+	@Environment(\.presentationMode) private var presentationMode
+	@ObservedObject private var viewModel = AddFeedViewModel()
+	
+    @ViewBuilder var body: some View {
+		#if os(iOS)
+			iosForm
+		#else
+			macForm
+				.onAppear {
+					pasteUrlFromPasteboard()
+				}.alert(isPresented: $viewModel.showError) {
+					Alert(title: Text("Oops"), message: Text(viewModel.addFeedError!.localizedDescription), dismissButton: Alert.Button.cancel({
+						viewModel.addFeedError = .none
+					}))
+				}
+		#endif
+    }
+	
+	#if os(macOS)
+	var macForm: some View {
+		VStack(alignment: .leading) {
+			urlTextField
+				.textFieldStyle(RoundedBorderTextFieldStyle())
+			providedNameTextField
+				.textFieldStyle(RoundedBorderTextFieldStyle())
+			folderPicker
+			buttonStack
+		}
+		.padding()
+		.frame(minWidth: 400)
+	}
+	#endif
+	
+	#if os(iOS)
+	var iosForm: some View {
+		NavigationLink {
+			List {
+				Text("PLACEHOLDER")
+			}.listStyle(InsetGroupedListStyle())
+		}
+	}
+	#endif
+	
+	var urlTextField: some View {
+		HStack {
+			Text("Feed URL:")
+			TextField("URL", text: $viewModel.providedURL)
+		}
+	}
+	
+	var providedNameTextField: some View {
+		HStack(alignment: .lastTextBaseline) {
+			Text("Name:")
+			TextField("Optional", text: $viewModel.providedName)
+		}
+	}
+	
+	var folderPicker: some View {
+		Picker("Folder", selection: $viewModel.selectedFolderIndex, content: {
+			ForEach(0..<viewModel.containers.count, id: \.self, content: { index in
+				if let containerName = (viewModel.containers[index] as? DisplayNameProvider)?.nameForDisplay {
+					if viewModel.containers[index] is Folder {
+						Text("\(viewModel.containers[index].account?.nameForDisplay ?? "") / \(containerName)").tag(index)
+					} else {
+						Text(containerName).tag(index)
+					}
+				}
+			})
+		})
+	}
+	
+	var buttonStack: some View {
+		HStack {
+			if viewModel.showProgressIndicator == true {
+				ProgressView()
+					.frame(width: 25, height: 25)
+			}
+			Spacer()
+			Button("Cancel", action: {
+				presentationMode.wrappedValue.dismiss()
+			})
+			Button("Add", action: {
+				addWebFeed()
+			}).disabled(!viewModel.providedURL.isValidURL)
+		}
+	}
+	
+	#if os(macOS)
+	func pasteUrlFromPasteboard() {
+		guard let stringFromPasteboard = urlStringFromPasteboard, stringFromPasteboard.isValidURL else {
+			return
+		}
+		viewModel.providedURL = stringFromPasteboard
+	}
+	#endif
+	
+}
+
+private extension AddFeedView {
+
+	var urlStringFromPasteboard: String? {
+		if let urlString = NSPasteboard.urlString(from: NSPasteboard.general) {
+			return urlString.normalizedURL
+		}
+		return nil
+	}
+	
+	struct AccountAndFolderSpecifier {
+		let account: Account
+		let folder: Folder?
+	}
+
+	func accountAndFolderFromContainer(_ container: Container) -> AccountAndFolderSpecifier? {
+		if let account = container as? Account {
+			return AccountAndFolderSpecifier(account: account, folder: nil)
+		}
+		if let folder = container as? Folder, let account = folder.account {
+			return AccountAndFolderSpecifier(account: account, folder: folder)
+		}
+		return nil
+	}
+	
+	func addWebFeed() {
+		if let account = accountAndFolderFromContainer(viewModel.containers[viewModel.selectedFolderIndex])?.account {
+			
+			viewModel.showProgressIndicator = true
+			
+			let container = viewModel.containers[viewModel.selectedFolderIndex]
+			
+			if account.hasWebFeed(withURL: viewModel.providedURL) {
+				viewModel.addFeedError = .alreadySubscribed
+				viewModel.showProgressIndicator = false
+				return
+			}
+			
+			account.createWebFeed(url: viewModel.providedURL, name: viewModel.providedName, container: container, completion: { result in
+				viewModel.showProgressIndicator = false
+				switch result {
+				case .success(let feed):
+					NotificationCenter.default.post(name: .UserDidAddFeed, object: self, userInfo: [UserInfoKey.webFeed: feed])
+					presentationMode.wrappedValue.dismiss()
+				case .failure(let error):
+					switch error {
+					case AccountError.createErrorAlreadySubscribed:
+						self.viewModel.addFeedError = .alreadySubscribed
+						return
+					case AccountError.createErrorNotFound:
+						self.viewModel.addFeedError = .noFeeds
+						return
+					default:
+						print("Error")
+					}
+				}
+			})
+		}
+	}
+}
+
+
+struct AddFeedView_Previews: PreviewProvider {
+    static var previews: some View {
+        AddFeedView()
+    }
+}