Initial version.

TINKLib/ViewModel/Contact/ContactPageViewModel.cs

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+using Plugin.Messaging;
+using Serilog;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using TINK.Model.Services.CopriApi.ServerUris;
+using TINK.MultilingualResources;
+using TINK.View;
+using Xamarin.Essentials;
+using Xamarin.Forms;
+
+namespace TINK.ViewModel.Info
+{
+    /// <summary> View model for contact page.</summary>
+    public class ContactPageViewModel
+    {
+        /// <summary> Reference on view service to show modal notifications and to perform navigation. </summary>
+        private IViewService ViewService { get; }
+
+        Uri ActiveUri { get; }
+
+        /// <summary> Holds a reference to the external trigger service. </summary>
+        private Action OpenUrlInExternalBrowser { get; }
+
+        Func<string> CreateAttachment { get; }
+
+        /// <summary> Constructs a contact page view model. </summary>
+        /// <param name="openUrlInExternalBrowser">Action to open an external browser.</param>
+        /// <param name="viewService">View service to notify user.</param>
+        public ContactPageViewModel(
+            Uri activeUri,
+            Func<string> createAttachment,
+            Action openUrlInExternalBrowser,
+            IViewService viewService)
+        {
+            ActiveUri = activeUri
+                ?? throw new ArgumentException("Can not instantiate contact page view model- object. No active uri available.");
+
+            CreateAttachment = createAttachment
+                ?? throw new ArgumentException("Can not instantiate contact page view model- object. No create attachment provider available.");
+
+            ViewService = viewService
+                ?? throw new ArgumentException("Can not instantiate contact page view model- object. No user view service available.");
+
+            OpenUrlInExternalBrowser = openUrlInExternalBrowser
+                ?? throw new ArgumentException("Can not instantiate contact page view model- object. No user external browse service available.");
+        }
+
+        /// <summary> Command object to bind login button to view model. </summary>
+        public ICommand OnMailRequest
+            => new Command(
+                    async () => await DoSendMail(),
+                    () => IsSendMailAvailable);
+
+
+        /// <summary>True if sending mail is possible.</summary>
+        public bool IsSendMailAvailable =>
+            CrossMessaging.Current.EmailMessenger.CanSendEmail;
+ 
+
+        /// <summary>cTrue if doing a phone call is possible.</summary>
+        public bool IsDoPhoncallAvailable
+            => CrossMessaging.Current.PhoneDialer.CanMakePhoneCall;
+
+        /// <summary>Holds the mail address to mail to.</summary>
+        public string MailAddressText
+        {
+            get 
+            { 
+                switch (ActiveUri.AbsoluteUri)
+                {
+                    case CopriServerUriList.TINK_DEVEL:
+                    case CopriServerUriList.TINK_LIVE:
+                        return "tink@fahrradspezialitaeten.com";
+                    
+                    case CopriServerUriList.SHAREE_DEVEL:
+                    case CopriServerUriList.SHAREE_LIVE:
+                        return "hotline@sharee.bike";
+
+                    default:
+                        return "post@sharee.bike";
+                }
+            }
+        }
+
+        /// <summary>Holds the mail address to send mail to.</summary>
+        public string PhoneNumberText
+        {
+            get 
+            {
+                switch (ActiveUri.AbsoluteUri)
+                {
+                    case CopriServerUriList.TINK_DEVEL:
+                    case CopriServerUriList.TINK_LIVE:
+                        return "+49 7531 - 3694389";
+
+                    case CopriServerUriList.SHAREE_DEVEL:
+                    case CopriServerUriList.SHAREE_LIVE:
+                        return "+49 761 - 45370097";
+
+                    default:
+                        return "+49 761 5158912";
+                }
+            }
+        }
+
+        /// <summary> Request to do a phone call. </summary>
+        public async Task DoSendMail()
+        {
+            try
+            {
+                if (!IsSendMailAvailable)
+                {
+                    // Nothing to do because email can not be sent.
+                    return;
+                }
+
+                var tinkMail = await ViewService.DisplayAlert(
+                        AppResources.QuestionTitle,
+                        string.Format(AppResources.QuestionSupportmailSubject, GetAppName(ActiveUri)),
+                        string.Format(AppResources.QuestionSupportmailAnswerOperator, GetAppName(ActiveUri)),
+                        string.Format(AppResources.QuestionSupportmailAnswerApp, GetAppName(ActiveUri)));
+
+                if (tinkMail)
+                {
+                    // Send TINK- related support mail.
+                    await Email.ComposeAsync(new EmailMessage { To = new List<string> { MailAddressText }, Subject = $"{GetAppName(ActiveUri)} Anfrage" });
+                    return;
+                }
+
+                // Send a tink app related mail
+                var appendFile = false;
+                appendFile = await ViewService.DisplayAlert(
+                    AppResources.QuestionTitle,
+                    AppResources.QuestionSupportmailAttachment,
+                    AppResources.QuestionAnswerYes,
+                    AppResources.QuestionAnswerNo);
+
+                var message = new EmailMessage { To = new List<string> { MailAddressText }, Subject = $"{GetAppName(ActiveUri)}-App Anfrage" };
+
+                if (appendFile == false)
+                {
+                    // Send a tink app related mail
+                    await Email.ComposeAsync(message);
+                    return;
+                }
+
+                var logFileName = string.Empty;
+                try
+                {
+                    logFileName = CreateAttachment();
+                }
+                catch (Exception l_oException)
+                {
+                    await ViewService.DisplayAdvancedAlert(
+                        AppResources.MessageWaring,
+                        AppResources.ErrorSupportmailCreateAttachment,
+                        l_oException.Message, 
+                        AppResources.MessageAnswerOk);
+                    Log.Error("An error occurred creating attachment. {@l_oException)", l_oException);
+                }
+
+                if (!string.IsNullOrEmpty(logFileName))
+                {
+                    message.Attachments.Add(new Xamarin.Essentials.EmailAttachment(logFileName));
+                }
+
+                // Send a tink app related mail
+                await Email.ComposeAsync(message);
+            }
+            catch (Exception p_oException)
+            {
+                Log.Error("An unexpected error occurred sending mail. {@Exception}", p_oException);
+                await ViewService.DisplayAdvancedAlert(
+                    AppResources.MessageWaring,
+                    AppResources.ErrorSupportmailMailingFailed, 
+                    p_oException.Message,
+                    AppResources.MessageAnswerOk);
+                return;
+            }
+        }
+
+        /// <summary> Command object to bind login button to view model. </summary>
+        public ICommand OnPhoneRequest
+            => new Command(
+                    async () => await DoPhoneCall(),
+                    () => IsDoPhoncallAvailable);
+
+        /// <summary> Request to do a phone call. </summary>
+        public async Task DoPhoneCall()
+        {
+            try
+            {
+                // Make Phone Call
+                if (IsDoPhoncallAvailable)
+                {
+                    CrossMessaging.Current.PhoneDialer.MakePhoneCall(PhoneNumberText);
+                }
+            }
+            catch (Exception p_oException)
+            {
+                Log.Error("An unexpected error occurred doing a phone call. {@Exception}", p_oException);
+                await ViewService.DisplayAdvancedAlert(
+                    AppResources.MessageWaring,
+                    AppResources.ErrorSupportmailPhoningFailed, 
+                    p_oException.Message,
+                    AppResources.MessageAnswerOk);
+                return;
+            }
+        }
+
+        /// <summary> Text providing mail address and possilbe reasons to contact. </summary>
+        public FormattedString MaliAddressAndMotivationsText
+        {
+            get
+            {
+                var hint = new FormattedString();
+                hint.Spans.Add(new Span { Text = AppResources.MessageContactMail });
+                return hint;
+            }
+        }
+
+        /// <summary> Invitation to rate app.</summary>
+        public FormattedString LikeTinkApp
+        {
+            get
+            {
+                var l_oHint = new FormattedString();
+                l_oHint.Spans.Add(new Span { Text = string.Format(AppResources.MessageRateMail, GetAppName(ActiveUri)) });
+                return l_oHint;
+            }
+        }
+
+        /// <summary> User clicks rate button.</summary>
+        public ICommand OnRateRequest
+            => new Command(() => RegisterRequest());
+
+        /// <summary> Opens login page.</summary>
+        public void RegisterRequest()
+        {
+            try
+            {
+                OpenUrlInExternalBrowser();
+            }
+            catch (Exception p_oException)
+            {
+                Log.Error("Ein unerwarteter Fehler ist auf der Login Seite beim Öffnen eines Browsers, Seite {url}, aufgetreten. {@Exception}", p_oException);
+                return;
+            }
+        }
+
+        /// <summary> Invitation to rate app.</summary>
+        public FormattedString PhoneContactText
+        {
+            get
+            {
+                var l_oHint = new FormattedString();
+                l_oHint.Spans.Add(new Span { Text = string.Format(AppResources.MessagePhoneMail, GetAppName(ActiveUri)) }); 
+                return l_oHint;
+            }
+        }
+
+        /// <summary>Gets the application name.</summary>
+        public static string GetAppName(Uri activeUri)
+        {
+            switch (activeUri.AbsoluteUri)
+            {
+                case CopriServerUriList.TINK_DEVEL:
+                case CopriServerUriList.TINK_LIVE:
+                    return "TINK";
+
+                case CopriServerUriList.SHAREE_DEVEL:
+                case CopriServerUriList.SHAREE_LIVE:
+                    return "sharee.bike";
+
+                default:
+                    return "Teilrad";
+            }
+        }
+    }
+}