Menu Help: if the default Mail app is not configured, try to open a mailto: URL…

Menu Help: if the default Mail app is not configured, try to open a mailto: URL instead of showing the error right away.

1Weather/ViewModels/MenuViewModel.swift

@@ -151,13 +151,6 @@ extension MenuViewModel {
     }
     
     public func showHelp() {
-        if !MFMailComposeViewController.canSendMail() {
-            let alertView = UIAlertController(title: nil, message: "menu.help.unableToSendEmail.text".localized(), preferredStyle: .alert)
-            alertView.addAction(UIAlertAction(title: "general.ok".localized(), style: .default, handler: nil))
-            self.viewControllerForPresentation().present(alertView, animated: true, completion: nil)
-            return
-        }
-        
         var emailSubject = ""
         let emailBody = helpRequestBodyString()
         var emailRecipients = [String]()
@@ -178,15 +171,37 @@ extension MenuViewModel {
         let installedDate = "Unknown"
         
         let deviceInfo = "Version: \(version)-\(build)\nDevice: \(deviceName)\nOS: \(systemVersion)\nPro: \(isPro) \nInstalled: \(installedDate) \(deviceToken)"
+        let emailHeaderAndBody = "\(deviceInfo) \n\n\(emailBody)"
         
-        let mc: MFMailComposeViewController = MFMailComposeViewController()
-        mc.mailComposeDelegate = self
-        mc.modalPresentationStyle = .formSheet
-        mc.setSubject(emailSubject)
-        mc.setMessageBody("\(deviceInfo) \n\n\(emailBody)", isHTML: false)
-        mc.setToRecipients(emailRecipients)
-        
-        self.viewControllerForPresentation().present(mc, animated: true, completion: nil)
+        if MFMailComposeViewController.canSendMail() {
+            let mc: MFMailComposeViewController = MFMailComposeViewController()
+            mc.mailComposeDelegate = self
+            mc.modalPresentationStyle = .formSheet
+            mc.setSubject(emailSubject)
+            mc.setMessageBody(emailHeaderAndBody, isHTML: false)
+            mc.setToRecipients(emailRecipients)
+            
+            self.viewControllerForPresentation().present(mc, animated: true, completion: nil)
+        }
+        else {
+            let mailtoParams = [
+                "subject": emailSubject,
+                "body": emailHeaderAndBody
+            ]
+            let mailtoQuery = mailtoParams.map { "\($0.key)=\($0.value)" }.joined(separator: "&")
+            guard
+                let encodedMailtoQuery = mailtoQuery.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed),
+                let mailUrl = URL(string: "mailto:\(emailRecipients.joined(separator: ","))?\(encodedMailtoQuery)"),
+                UIApplication.shared.canOpenURL(mailUrl)
+            else {
+                let alertView = UIAlertController(title: nil, message: "menu.help.unableToSendEmail.text".localized(), preferredStyle: .alert)
+                alertView.addAction(UIAlertAction(title: "general.ok".localized(), style: .default, handler: nil))
+                self.viewControllerForPresentation().present(alertView, animated: true, completion: nil)
+                return
+            }
+            
+            UIApplication.shared.open(mailUrl)
+        }
     }
 }