From da915488755bc960b9de27f94149b64e212ebbca Mon Sep 17 00:00:00 2001
From: Stuart Breckenridge <stuart.breckenridge@icloud.com>
Date: Sun, 5 Feb 2023 09:40:41 +0800
Subject: [PATCH] Shows Twitter deprecation alert on macOS

---
 Mac/AppDefaults.swift | 11 +++++++++++
 Mac/AppDelegate.swift | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/Mac/AppDefaults.swift b/Mac/AppDefaults.swift
index df9b7c618..c169c76a9 100644
--- a/Mac/AppDefaults.swift
+++ b/Mac/AppDefaults.swift
@@ -42,6 +42,7 @@ final class AppDefaults {
 		static let exportOPMLAccountID = "exportOPMLAccountID"
 		static let defaultBrowserID = "defaultBrowserID"
 		static let currentThemeName = "currentThemeName"
+		static let twitterDeprecationAlertShown = "twitterDeprecationAlertShown"
 
 		// Hidden prefs
 		static let showDebugMenu = "ShowDebugMenu"
@@ -308,6 +309,16 @@ final class AppDefaults {
 			UserDefaults.standard.set(newValue.rawValue, forKey: Key.refreshInterval)
 		}
 	}
+	
+	var twitterDeprecationAlertShown: Bool {
+		get {
+			return AppDefaults.bool(for: Key.twitterDeprecationAlertShown)
+		}
+		set {
+			AppDefaults.setBool(for: Key.twitterDeprecationAlertShown, newValue)
+		}
+	}
+	
 
 	func registerDefaults() {
 		#if DEBUG
diff --git a/Mac/AppDelegate.swift b/Mac/AppDelegate.swift
index b3a278556..c355555b3 100644
--- a/Mac/AppDelegate.swift
+++ b/Mac/AppDelegate.swift
@@ -132,6 +132,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations,
 		NSWorkspace.shared.notificationCenter.addObserver(self, selector: #selector(didWakeNotification(_:)), name: NSWorkspace.didWakeNotification, object: nil)
 
 		appDelegate = self
+		
+		presentTwitterDeprecationAlertIfRequired()
 	}
 
 	// MARK: - API
@@ -952,6 +954,46 @@ internal extension AppDelegate {
 		}
 	}
 	
+	private func presentTwitterDeprecationAlertIfRequired() {
+		if AppDefaults.shared.twitterDeprecationAlertShown { return }
+		
+		let expiryDate = Date(timeIntervalSince1970: 1691539200).timeIntervalSince1970 // August 9th 2023, 00:00 UTC
+		let currentDate = Date().timeIntervalSince1970
+		if currentDate > expiryDate {
+			return // If after August 9th, don't show
+		}
+		
+		var twitterIsActive: Bool = false
+		AccountManager.shared.accounts.forEach({ account in
+			account.flattenedWebFeeds().forEach({ webfeed in
+				guard let components = URLComponents(string: webfeed.url),
+					  let host = components.host else {
+					return
+				}
+				if host == "twitter.com" {
+					twitterIsActive = true
+					return
+				}
+			})
+		})
+		if twitterIsActive {
+			showTwitterDeprecationAlert()
+		}
+		AppDefaults.shared.twitterDeprecationAlertShown = true
+	}
+	
+	private func showTwitterDeprecationAlert() {
+		DispatchQueue.main.async {
+			let alert = NSAlert()
+			alert.alertStyle = .warning
+			alert.messageText = NSLocalizedString("Twitter Integration Removed", comment: "Twitter Integration Removed")
+			alert.informativeText = NSLocalizedString("On February 1, 2023, Twitter announced the end of free access to the Twitter API, effective February 9.\n\nSince Twitter does not provide RSS feeds, we’ve had to use the Twitter API. Without free access to that API, we can’t read feeds from Twitter.\n\nWe’ve left your Twitter feeds intact. If you have any starred items from those feeds, they will remain as long as you don’t delete those feeds.\n\nYou can still read whatever you have already downloaded. However, those feeds will no longer update.", comment: "Twitter deprecation informative text.")
+			alert.addButton(withTitle: NSLocalizedString("OK", comment: "OK"))
+			alert.buttons[0].keyEquivalent = "\r"
+			alert.runModal()
+		}
+	}
+	
 	@objc func openThemesFolder(_ sender: Any) {
 		if themeImportPath == nil {
 			let url = URL(fileURLWithPath: ArticleThemesManager.shared.folderPath)