Add db logic to save SOS phone number

SOS/App.xaml.cs

@@ -1,11 +1,17 @@
-namespace SOS;
+using SOS.Data;
+
+namespace SOS;
 
 public partial class App : Application
 {
-	public App()
-	{
-		InitializeComponent();
+    public static SettingsRepository SettingsRepo { get; private set; }
+
+    public App(SettingsRepository repo)
+    {
+        InitializeComponent();
+
+        MainPage = new AppShell();
 
-		MainPage = new AppShell();
-	}
+        SettingsRepo = repo;
+    }
 }

SOS/Data/Constants.cs

@@ -0,0 +1,15 @@
+namespace SOS.Data
+{
+    public static class Constants
+    {
+        public const string DatabaseFilename = "SOSSettings.db3";
+
+        public const SQLite.SQLiteOpenFlags Flags =
+            SQLite.SQLiteOpenFlags.ReadWrite |
+            SQLite.SQLiteOpenFlags.Create |
+            SQLite.SQLiteOpenFlags.SharedCache;
+
+        public static string DatabasePath =>
+            Path.Combine(FileSystem.AppDataDirectory, DatabaseFilename);
+    }
+}

SOS/Data/SettingsRepository.cs

@@ -0,0 +1,81 @@
+using SOS.Models;
+using SQLite;
+
+namespace SOS.Data
+{
+    public class SettingsRepository
+    {
+        private SQLiteAsyncConnection conn;
+
+        public async Task Init()
+        {
+            if (conn != null)
+            {
+                return;
+            }
+
+            conn = new SQLiteAsyncConnection(Constants.DatabasePath, Constants.Flags);
+            await conn.CreateTableAsync<SettingsData>();
+        }
+
+        public async Task<DbResponse> SaveNumber(string phoneNumber)
+        {
+            try
+            {
+                await Init();
+
+                var settingsList = await conn.Table<SettingsData>().ToListAsync();
+                var settings = settingsList.FirstOrDefault();
+                if (settings is null)
+                {
+                    settings = new SettingsData { PhoneNumber = phoneNumber };
+                    await conn.InsertAsync(settings);
+                }
+                else
+                {
+                    settings.PhoneNumber = phoneNumber;
+                    await conn.UpdateAsync(settings);
+                }
+                return new DbResponse()
+                {
+                    Status = true,
+                    StatusMessage = "Number saved sucessfully",
+                    SettingsData = settings
+                };
+            }
+            catch (Exception ex)
+            {
+                return new DbResponse()
+                {
+                    Status = false,
+                    StatusMessage = ex.Message,
+                    SettingsData = null
+                };
+            }
+        }
+
+        public async Task<DbResponse> IsNumberSavedAsync()
+        {
+            await Init();
+            var settingsList = await conn.Table<SettingsData>().ToListAsync();
+            var settings = settingsList.FirstOrDefault();
+
+            if (settings is null)
+            {
+                return new DbResponse()
+                {
+                    Status = false,
+                    StatusMessage = "SOS number missing",
+                    SettingsData = null
+                };
+            }
+
+            return new DbResponse()
+            {
+                Status = true,
+                StatusMessage = "SOS number exists",
+                SettingsData = settings
+            };
+        }
+    }
+}

SOS/MainPage.xaml.cs

@@ -5,12 +5,31 @@ public partial class MainPage : ContentPage
 	public MainPage()
 	{
 		InitializeComponent();
+
+        Init();
 	}
 
+    private async void Init()
+    {
+        var settingsDbResponse = await App.SettingsRepo.IsNumberSavedAsync();
+        if (settingsDbResponse.Status == false)
+        {
+            await DisplayAlert("Alert", "Please add SOS number", "Ok");
+        }
+    }
+
     private async void SOSButtonClicked(object sender, EventArgs e)
     {
+        var settingsDbResponse = await App.SettingsRepo.IsNumberSavedAsync();
+        if (settingsDbResponse.Status == false)
+        {
+            await DisplayAlert("Alert", "SOS number missing", "Ok");
+            return;
+        }
+
+        var settings = settingsDbResponse.SettingsData;
         SOSButton.BackgroundColor = Colors.Crimson;
-        await DisplayAlert("Alert", "Button Works", "Ok");
+        await DisplayAlert("Alert", $"Saved number: {settings.PhoneNumber}", "Ok");
         SOSButton.BackgroundColor = Colors.Red;
     }
 }

SOS/MauiProgram.cs

@@ -1,4 +1,6 @@
-namespace SOS;
+using SOS.Data;
+
+namespace SOS;
 
 public static class MauiProgram
 {
@@ -13,6 +15,8 @@ public static MauiApp CreateMauiApp()
 				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
 			});
 
-		return builder.Build();
+        builder.Services.AddSingleton<SettingsRepository>();
+
+        return builder.Build();
 	}
 }

SOS/Models/DbResponse.cs

@@ -0,0 +1,9 @@
+namespace SOS.Models
+{
+    public class DbResponse
+    {
+        public bool Status { get; set; }
+        public string StatusMessage { get; set; }
+        public SettingsData SettingsData { get; set; }
+    }
+}

SOS/Models/SettingsData.cs

@@ -0,0 +1,13 @@
+using SQLite;
+
+namespace SOS.Models
+{
+    [Table("settings")]
+    public class SettingsData
+    {
+        [PrimaryKey, AutoIncrement, Column("_id")]
+        public int Id { get; set; }
+        [MaxLength(14), Unique]
+        public string PhoneNumber { get; set; }
+    }
+}

SOS/SOS.csproj

@@ -47,10 +47,20 @@
 		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
 	</ItemGroup>
 
+	<ItemGroup>
+	  <PackageReference Include="sqlite-net-pcl" Version="1.8.116" />
+	  <PackageReference Include="SQLitePCLRaw.core" Version="2.1.0" />
+	  <PackageReference Include="SQLitePCLRaw.bundle_green" Version="2.1.0" />
+	  <PackageReference Include="SQLitePCLRaw.provider.dynamic_cdecl" Version="2.1.0" />
+	  <PackageReference Include="SQLitePCLRaw.provider.sqlite3" Version="2.1.0" />
+	</ItemGroup>
+
 	<ItemGroup>
 	  <MauiXaml Update="SettingsPage.xaml">
 	    <Generator>MSBuild:Compile</Generator>
 	  </MauiXaml>
 	</ItemGroup>
 
+	<ProjectExtensions><VisualStudio><UserProperties XamarinHotReloadDebuggerTimeoutExceptionSOSHideInfoBar="True" /></VisualStudio></ProjectExtensions>
+
 </Project>

SOS/SettingsPage.xaml

@@ -22,6 +22,11 @@
                 VerticalOptions="Center" 
                 HorizontalOptions="FillAndExpand"
                 Clicked="SaveSettingsButtonClicked" />
-
+
+        <Label Text ="SOS number missing"
+               x:Name="SavedNumberLabel"
+               VerticalOptions="Center"
+               HorizontalOptions="FillAndExpand" />
+
     </VerticalStackLayout>
 </ContentPage>

SOS/SettingsPage.xaml.cs

@@ -1,14 +1,55 @@
+using SOS.Models;
+using System.Text.RegularExpressions;
+
 namespace SOS;
 
 public partial class SettingsPage : ContentPage
 {
+	public SettingsData settings;
+
 	public SettingsPage()
 	{
 		InitializeComponent();
+
+        Task.Run(async () => await SetNumberIfExists());
+	}
+
+	private async Task SetNumberIfExists()
+	{
+		var settingsDbResponse = await App.SettingsRepo.IsNumberSavedAsync();
+		settings = settingsDbResponse.SettingsData;
+
+		if(settingsDbResponse.Status is true)
+		{
+			SavedNumberLabel.Text = $"Saved Number: {settings.PhoneNumber}";
+		}
+
+		else 
+		{
+			SavedNumberLabel.Text = settingsDbResponse.StatusMessage;
+			settings = new SettingsData();
+		}
 	}
 
     private async void SaveSettingsButtonClicked(object sender, EventArgs e)
-    {
-		await DisplayAlert("Alert", "Button Works", "Ok");
+    {        
+		string phoneNumber = PhoneNumber.Text;
+
+        Regex validatePhoneNumberRegex = new Regex("^\\+?[1-9][0-9]{7,14}$");
+
+		if(String.IsNullOrEmpty(phoneNumber) || validatePhoneNumberRegex.IsMatch(phoneNumber) is not true)
+		{
+			await DisplayAlert("Alert", "Enter phone number in proper format", "Ok");
+			return;
+		}
+
+		var settingsDbResponse = await App.SettingsRepo.SaveNumber(phoneNumber);
+
+		if(settingsDbResponse.Status is false) 
+		{
+			await DisplayAlert("Error", settingsDbResponse.StatusMessage, "Ok");
+        }
+
+		await SetNumberIfExists();
     }
 }