add catastrophic performance persistance system for accounts, users,

recipes and recipe rates

ConnectAppShell.xaml.cs

@@ -7,7 +7,7 @@ using ShoopNCook.Pages;
 
 public partial class ConnectAppShell : Shell
 {
-	public ConnectAppShell(ConnectionObserver observer, IAccountManager accounts, IUserNotifier notifier)
+	public ConnectAppShell(ConnectionObserver observer, IAuthService accounts, IUserNotifier notifier)
 	{
 		ConnectionController controller = new ConnectionController(observer, accounts, notifier);
 		InitializeComponent();

Controllers/ConnectionController.cs

@@ -6,9 +6,9 @@ namespace ShoopNCook.Controllers
     public class ConnectionController : LoginController, RegisterController
     {
         private readonly ConnectionObserver observer;
-        private readonly IAccountManager accounts;
+        private readonly IAuthService accounts;
         private readonly IUserNotifier notifier;
-        public ConnectionController(ConnectionObserver observer, IAccountManager accounts, IUserNotifier notifier) {
+        public ConnectionController(ConnectionObserver observer, IAuthService accounts, IUserNotifier notifier) {
             this.observer = observer;
             this.accounts = accounts;
             this.notifier = notifier;

Endpoint/IAccountRecipesPreferences.cs

@@ -13,7 +13,7 @@ namespace Endpoint
         public void SetReviewScore(RecipeInfo info, uint score);
         public bool AddToWeeklyList(RecipeInfo info, uint persAmount);
 
-        public AccountRecipeRate GetRate(RecipeInfo info);
+        public RecipeRate GetRate(RecipeInfo info);
 
         public ImmutableList<RecipeInfo> GetFavorites();
 

Endpoint/IAuthService.cs

@@ -1,7 +1,7 @@
 using Models;
 namespace Endpoint
 {
-    public interface IAccountManager
+    public interface IAuthService
     {
         public Account? Login(string email, string password);
 

Endpoint/IEndpoint.cs

@@ -4,7 +4,7 @@ namespace Endpoint
 {
     public interface IEndpoint
     {
-        public IAccountManager AccountManager { get; }
+        public IAuthService AccountManager { get; }
 
         public IRecipesService RecipesService { get; }
 

LocalEndpoint/AccountData.cs

@@ -1,11 +0,0 @@
-using Endpoint;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace LocalEndpoint
-{
-    internal record AccountData(IAccountOwnedRecipes Recipes, IAccountRecipesPreferences Preferences);
-}

LocalEndpoint/AccountOwnedRecipes.cs

@@ -1,4 +1,5 @@
 using LocalEndpoint;
+using LocalEndpoint.Data;
 using Models;
 using System.Collections.Immutable;
 
@@ -10,17 +11,18 @@ namespace Endpoint
         public Account Account { get; init; }
 
         private readonly Dictionary<Guid, Recipe> ownedRecipes = new Dictionary<Guid, Recipe>();
-        private readonly RecipesDatabase db;
+        private readonly Database db;
 
-        public AccountOwnedRecipes(Account account, RecipesDatabase db)
+        public AccountOwnedRecipes(Account account, Database db)
         {
             Account = account;
             this.db = db;
 
             //Retrieve all owned recipes from database.
-            db.ListAll().ForEach(recipe =>
+            db.ListAllRecipes().ForEach(recipe =>
             {
-                if (recipe.Owner == account.User) ownedRecipes[recipe.Info.Id] = recipe;
+                if (recipe.Owner.Equals(account.User))
+                    ownedRecipes.Add(recipe.Info.Id, recipe);
             });
         }
 
@@ -31,14 +33,14 @@ namespace Endpoint
             {
                 return false;
             }
-            db.Insert(recipe);
+            db.InsertRecipe(recipe);
             ownedRecipes.Add(id, recipe);
             return true;
         }
 
         public bool RemoveRecipe(RecipeInfo info)
         {
-            db.Remove(info.Id);
+            db.RemoveRecipe(info.Id);
             return ownedRecipes.Remove(info.Id);
         }
 

LocalEndpoint/AccountRecipesPreferences.cs

@@ -1,24 +1,18 @@
 using Endpoint;
+using LocalEndpoint.Data;
 using Models;
-using System;
-using System.Collections.Generic;
 using System.Collections.Immutable;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace LocalEndpoint
 {
     internal class AccountRecipesPreferences : IAccountRecipesPreferences
     {
-        //Binds a recipe's id to it's account review ratings.
-        private readonly Dictionary<Guid, AccountRecipeRate> ratings = new Dictionary<Guid, AccountRecipeRate>();
 
         //Binds a recipe's id to its amount of person stored in the account's weekly list
         private readonly Dictionary<Guid, uint> weekly = new Dictionary<Guid, uint>();
 
-        private readonly RecipesDatabase db;
-        public AccountRecipesPreferences(Account account, RecipesDatabase db)
+        private readonly Database db;
+        public AccountRecipesPreferences(Account account, Database db)
         {
             Account = account;
             this.db = db;
@@ -28,15 +22,17 @@ namespace LocalEndpoint
 
         public ImmutableList<RecipeInfo> GetRecommendedRecipes()
         {
-            return db.ListAll().ConvertAll(recipe => recipe.Info);
+            return db.ListAllRecipes().ConvertAll(recipe => recipe.Info);
         }
 
         public ImmutableList<RecipeInfo> GetFavorites()
         {
             List<RecipeInfo> favorites = new List<RecipeInfo>();
-            foreach (Recipe recipe in db.ListAll())
+            var ratings = db.ListRatesOf(Account.User.Id);
+
+            foreach (Recipe recipe in db.ListAllRecipes())
             {
-                if (ratings.TryGetValue(recipe.Info.Id, out AccountRecipeRate? rate))
+                if (ratings.TryGetValue(recipe.Info.Id, out RecipeRate? rate))
                 {
                     if (rate.IsFavorite) 
                         favorites.Add(recipe.Info);
@@ -48,7 +44,7 @@ namespace LocalEndpoint
         public ImmutableList<(RecipeInfo, uint)> GetWeeklyList()
         {
             List<(RecipeInfo, uint)> weekly = new List<(RecipeInfo, uint)>();
-            foreach (Recipe recipe in db.ListAll())
+            foreach (Recipe recipe in db.ListAllRecipes())
             {
                 if (this.weekly.TryGetValue(recipe.Info.Id, out uint personAmmount))
                 {
@@ -59,24 +55,19 @@ namespace LocalEndpoint
         }
 
         
-        public AccountRecipeRate GetRate(RecipeInfo info)
+        public RecipeRate GetRate(RecipeInfo info)
         {
-            AccountRecipeRate rate = null;
+            RecipeRate rate = null;
+            var ratings = db.ListRatesOf(Account.User.Id);
+
             if (!ratings.TryGetValue(info.Id, out rate))
             {
-                rate = new AccountRecipeRate();
+                rate = new RecipeRate();
                 ratings.Add(info.Id, rate);
             }
             return rate;
         }
 
-        public void AddToFavorites(RecipeInfo info)
-        {
-            AccountRecipeRate rate = GetRate(info);
-            ratings[info.Id] = new AccountRecipeRate(true, rate.Rate);
-        }
-
-
         public bool AddToWeeklyList(RecipeInfo info, uint persAmount)
         {
             if (weekly.ContainsKey(info.Id))
@@ -87,16 +78,32 @@ namespace LocalEndpoint
             return true;
         }
 
+
+        public void AddToFavorites(RecipeInfo info)
+        {
+            Guid userId = Account.User.Id;
+            var ratings = db.ListRatesOf(userId);
+            RecipeRate rate = GetRate(info);
+
+            db.InsertRate(userId, info.Id, new RecipeRate(true, rate.Rate));
+        }
+
         public void RemoveFromFavorites(RecipeInfo info)
         {
-            AccountRecipeRate rate = GetRate(info);
-            ratings[info.Id] = new AccountRecipeRate(false, rate.Rate);
+            Guid userId = Account.User.Id;
+            var ratings = db.ListRatesOf(userId);
+            RecipeRate rate = GetRate(info);
+
+            db.InsertRate(userId, info.Id, new RecipeRate(false, rate.Rate));
         }
 
         public void SetReviewScore(RecipeInfo info, uint score)
         {
-            AccountRecipeRate rate = GetRate(info);
-            ratings[info.Id] = new AccountRecipeRate(rate.IsFavorite, score);
+            Guid userId = Account.User.Id;
+            var ratings = db.ListRatesOf(userId);
+            RecipeRate rate = GetRate(info);
+
+            db.InsertRate(userId, info.Id, new RecipeRate(rate.IsFavorite, score));
         }
     }
 }

LocalEndpoint/AccountServices.cs

@@ -0,0 +1,6 @@
+using Endpoint;
+
+namespace LocalEndpoint
+{
+    internal record AccountServices(IAccountOwnedRecipes Recipes, IAccountRecipesPreferences Preferences);
+}

LocalEndpoint/AuthService.cs

@@ -5,28 +5,33 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using LocalEndpoint.Data;
+using System.Security.Cryptography;
 
 namespace LocalEndpoint
 {
-    internal class ConnectionManager : IAccountManager
+    internal class AuthService : IAuthService
     {
-        private Account userAccount = Constants.MAIN_USER_ACCOUNT;
-        private string userPassword = Constants.MAIN_USER_PASSWORD;
-        public Account? Login(string email, string password)
+        private readonly Database db;
+
+
+        public AuthService(Database db)
         {
-            if (Constants.MAIN_USER_ACCOUNT.Email == email && Constants.MAIN_USER_PASSWORD == password)
-                return Constants.MAIN_USER_ACCOUNT;
-            return null;
+            this.db = db;
         }
 
+        public Account? Login(string email, string password)
+        {
+            return db.GetAccount(email, password);
+        }
 
         public Account? Register(string email, string username, string password)
         {
             if (email == null || username == null || password == null)
                 return null;
 
-            userAccount = new Account(new User(Constants.DEFAULT_ACCOUNT_IMAGE, username), email);
-            userPassword = password;
+            var userAccount = new Account(new User(Constants.DEFAULT_ACCOUNT_IMAGE, username, Guid.NewGuid()), email);
+            db.InsertAccount(userAccount, password);
             return userAccount;
         }
     }

LocalEndpoint/Constants.cs

@@ -4,17 +4,6 @@ namespace LocalEndpoint
 {
     internal class Constants
     {
-
         public static readonly Uri DEFAULT_ACCOUNT_IMAGE = new Uri("https://www.pngkey.com/png/full/115-1150152_default-profile-picture-avatar-png-green.png");
-
-        // User account for tests
-        public static readonly Account MAIN_USER_ACCOUNT = new Account(new User(DEFAULT_ACCOUNT_IMAGE, "Example Account"), "test@example.com");
-        public static readonly string  MAIN_USER_PASSWORD = "123456";
-
-        // other user samples
-        public static readonly User USER1 = new User(new Uri("https://i.ibb.co/L6t6bGR/DALL-E-2023-05-10-20-27-31-cook-looking-at-the-camera-with-a-chef-s-hat-laughing-in-an-exaggerated-w.png"), "The Funny Chief");
-        public static readonly User USER2 = new User(DEFAULT_ACCOUNT_IMAGE, "Yanis");
-        public static readonly User USER3 = new User(DEFAULT_ACCOUNT_IMAGE, "Leo");
-
     }
 }

LocalEndpoint/Data/AccountData.cs

@@ -0,0 +1,17 @@
+using Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LocalEndpoint.Data
+{
+    [DataContract]
+    internal record AccountData(
+        [property: DataMember] Guid UserId,
+        [property: DataMember] string Email,
+        [property: DataMember] string PasswordHash
+    );
+}

LocalEndpoint/Data/CatastrophicPerformancesDatabase.cs

@@ -0,0 +1,143 @@
+using Models;
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LocalEndpoint.Data
+{
+    /// <summary>
+    /// Database implementation with catastrophic performances.
+    /// This database implementation persists data in xml and will save all the data in their files on each mutable requests.
+    /// </summary>
+    internal class CatastrophicPerformancesDatabase : Database
+    {
+
+        private static readonly DataContractSerializer RECIPES_SERIALIZER = new DataContractSerializer(typeof(Dictionary<Guid, RecipeData>));
+        private static readonly DataContractSerializer USERS_SERIALIZER = new DataContractSerializer(typeof(Dictionary<Guid, UserData>));
+        private static readonly DataContractSerializer ACCOUNTS_SERIALIZER = new DataContractSerializer(typeof(Dictionary<string, AccountData>));
+
+        private static readonly string RECIPES_FILENAME = "recipes_data.xml";
+        private static readonly string USERS_FILENAME = "users_data.xml";
+        private static readonly string ACCOUNTS_FILENAME = "accounts_data.xml";
+
+        private readonly Dictionary<Guid, RecipeData> recipesData;
+        private readonly Dictionary<Guid, UserData> usersData;
+        private readonly Dictionary<string, AccountData> accountsData;
+
+        private readonly string dbPath;
+
+
+        public CatastrophicPerformancesDatabase(string folderPath)
+        {
+            dbPath = folderPath;
+            if (!Directory.Exists(folderPath))
+                Directory.CreateDirectory(folderPath);
+
+            usersData = Load<Guid, UserData>(USERS_FILENAME, USERS_SERIALIZER);
+            recipesData = Load<Guid, RecipeData>(RECIPES_FILENAME, RECIPES_SERIALIZER);
+            accountsData = Load<string, AccountData>(ACCOUNTS_FILENAME, ACCOUNTS_SERIALIZER);
+        }
+
+        public bool IsEmpty()
+        {
+            return recipesData.Count == 0 && usersData.Count == 0 && accountsData.Count == 0;
+        }
+
+        public Account? GetAccount(string email, string passwordHash)
+        {
+            if (!accountsData.TryGetValue(email, out AccountData? data))
+                return null;
+            
+            if (data.PasswordHash != passwordHash) return null;
+            return new Account(usersData[data.UserId].User, data.Email);
+        }
+
+        public void InsertAccount(Account account, string passwordHash)
+        {
+            accountsData[account.Email] = new AccountData(account.User.Id, account.Email, passwordHash);
+            Save(ACCOUNTS_FILENAME, ACCOUNTS_SERIALIZER, accountsData);
+        }
+
+        public Recipe GetRecipe(Guid id)
+        {
+            return ConvertRecipeDataToRecipe(recipesData[id]);
+        }
+
+        public RecipeRate GetRecipeRate(Guid user, Guid recipe)
+        {
+            return usersData[user].Rates[recipe];
+        }
+
+
+        public void InsertRecipe(Recipe recipe)
+        {
+            recipesData[recipe.Info.Id] = new RecipeData(recipe.Info, recipe.Owner.Id, recipe.Ingredients, recipe.Steps);
+            Save(RECIPES_FILENAME, RECIPES_SERIALIZER, recipesData);
+        }
+
+        public void InsertUser(User user)
+        {
+            usersData[user.Id] = new UserData(user, new Dictionary<Guid, RecipeRate>());
+            Save(USERS_FILENAME, USERS_SERIALIZER, usersData);
+        }
+
+        public void InsertRate(Guid userId, Guid recipeId, RecipeRate rate)
+        {
+            usersData[userId].Rates[recipeId] = rate;
+            Save(USERS_FILENAME, USERS_SERIALIZER, usersData);
+        }
+
+        public void RemoveRecipe(Guid id)
+        {
+            recipesData.Remove(id);
+            Save(RECIPES_FILENAME, RECIPES_SERIALIZER, recipesData);
+        }
+
+        public ImmutableList<Recipe> ListAllRecipes()
+        {
+            return recipesData.Values.ToImmutableList().ConvertAll(ConvertRecipeDataToRecipe);
+        }
+
+
+        public ImmutableDictionary<Guid, RecipeRate> ListRatesOf(Guid user)
+        {
+            return usersData[user].Rates.ToImmutableDictionary();
+        }
+
+        private Recipe ConvertRecipeDataToRecipe(RecipeData rd)
+        {
+            var owner = usersData[rd.OwnerID].User;
+            return new Recipe(rd.Info, owner, rd.Ingredients, rd.Steps);
+        }
+
+        private Dictionary<K, V> Load<K, V>(string fileName, DataContractSerializer deserializer)
+        {
+            var file = dbPath + "/" + fileName;
+            var fileInfo = new FileInfo(file);
+
+            if (!fileInfo.Exists)
+                fileInfo.Create();
+
+            if (fileInfo.Length == 0)
+                return new Dictionary<K, V>(); //file is empty thus there is nothing to deserialize
+            Console.WriteLine(File.ReadAllText(file));
+
+            using (var stream = File.OpenRead(file))
+                return deserializer.ReadObject(stream) as Dictionary<K, V> ?? throw new Exception("object read from " + file + " is not a dictionnary");
+        }
+
+        private void Save<K, T>(string fileName, DataContractSerializer serializer, Dictionary<K, T> dict)
+        {
+            using (var stream = File.OpenWrite(dbPath + "/" + fileName))
+            {
+                serializer.WriteObject(stream, dict);
+                stream.Flush();
+            }
+        }
+
+    }
+}

LocalEndpoint/Data/Database.cs

@@ -0,0 +1,32 @@
+
+using Models;
+using System.Collections.Immutable;
+
+namespace LocalEndpoint.Data
+{
+
+    // The database interface defines all the different kinds of requests the LocalEndpoint needs to store and retrieve data.
+    public interface Database
+    {
+
+        public Recipe GetRecipe(Guid id);
+
+        public RecipeRate GetRecipeRate(Guid user, Guid recipe);
+
+        public Account? GetAccount(string email, string passwordHash);
+
+        public void InsertAccount(Account account, string passwordHash);
+
+        public void InsertRecipe(Recipe recipe);
+
+        public void InsertUser(User user);
+
+        public void InsertRate(Guid userId, Guid recipeId, RecipeRate rate);
+
+        public void RemoveRecipe(Guid id);
+
+        public ImmutableList<Recipe> ListAllRecipes();
+
+        public ImmutableDictionary<Guid, RecipeRate> ListRatesOf(Guid user);
+    }
+}

LocalEndpoint/Data/RecipeData.cs

@@ -0,0 +1,14 @@
+using Models;
+using System.Collections.Immutable;
+using System.Runtime.Serialization;
+
+namespace LocalEndpoint.Data
+{
+    [DataContract]
+    internal record RecipeData(
+        [property: DataMember] RecipeInfo Info,
+        [property: DataMember] Guid OwnerID,
+        [property: DataMember] ImmutableList<Ingredient> Ingredients,
+        [property: DataMember] ImmutableList<PreparationStep> Steps
+    );
+}

LocalEndpoint/Data/UserData.cs

@@ -0,0 +1,13 @@
+
+
+using Models;
+using System.Runtime.Serialization;
+
+namespace LocalEndpoint.Data
+{
+    [DataContract]
+    internal record UserData(
+        [property: DataMember] User User,
+        [property: DataMember] Dictionary<Guid, RecipeRate> Rates
+    );
+}

LocalEndpoint/LocalEndpoint.cs

@@ -1,4 +1,5 @@
 using Endpoint;
+using LocalEndpoint.Data;
 using Models;
 using System.Collections.Immutable;
 
@@ -11,28 +12,54 @@ namespace LocalEndpoint
     /// </summary>
     public class LocalEndpoint : IEndpoint
     {
-        private readonly IAccountManager accountManager = new ConnectionManager();
+        private readonly IAuthService authService;
         private readonly IRecipesService recipesService;
 
 
         public LocalEndpoint()
         {
-            RecipesDatabase db = new RecipesDatabase(Environment.GetFolderPath(Environment.SpecialFolder.Personal) + "/recipes.xaml");
-
-            //miam
-            /*db.Insert(new Recipe(new RecipeInfo("Chicken Salad", 500, 20, new Uri("https://healthyfitnessmeals.com/wp-content/uploads/2021/04/Southwest-chicken-salad-7-500x500.jpg"), 4, Guid.NewGuid()), Constants.USER1, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
-            db.Insert(new Recipe(new RecipeInfo("Chocolate Cake", 2500, 10, new Uri("https://bakewithshivesh.com/wp-content/uploads/2022/08/IMG_0248-scaled.jpg"), 3, Guid.NewGuid()), Constants.USER2, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
-            db.Insert(new Recipe(new RecipeInfo("Salmon", 20, 10, new Uri("https://www.wholesomeyum.com/wp-content/uploads/2021/06/wholesomeyum-Pan-Seared-Salmon-Recipe-13.jpg"), 4, Guid.NewGuid()), Constants.MAIN_USER_ACCOUNT.User, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
-            db.Insert(new Recipe(new RecipeInfo("Fish", 50, 30, new Uri("https://www.ciaanet.org/wp-content/uploads/2022/07/Atlantic-and-Pacific-whole-salmon-1024x683.jpg"), 4.5F, Guid.NewGuid()), Constants.MAIN_USER_ACCOUNT.User, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
-            db.Insert(new Recipe(new RecipeInfo("Space Cake", 800, 5, new Uri("https://static.youmiam.com/images/recipe/1500x1000/space-cake-22706?placeholder=web_recipe&sig=f14a7a86da837c6b8cc678cde424d6d5902f99ec&v3"), 5, Guid.NewGuid()), Constants.USER3, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
-            db.Insert(new Recipe(new RecipeInfo("Cupcake", 500, 12, new Uri("https://www.mycake.fr/wp-content/uploads/2015/12/rs_cupcake_4x3.jpg"), 4.2F, Guid.NewGuid()), account.User, new List<Ingredient> { new Ingredient("Chocolate", 4) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Eat Chocolate", "Eat the chocolate") }.ToImmutableList()));
-             */
+            var db = new CatastrophicPerformancesDatabase(Environment.GetFolderPath(Environment.SpecialFolder.Personal));
+
+            if (db.IsEmpty()) 
+                PrepareDatabase(db);
+            
             recipesService = new RecipesService(db);
+            authService = new AuthService(db);
         }
 
-        public IAccountManager AccountManager => accountManager;
+        public IAuthService AccountManager => authService;
 
         public IRecipesService RecipesService => recipesService;
 
+        private static void PrepareDatabase(Database db)
+        {
+            User USER1 = new User(new Uri("https://i.ibb.co/L6t6bGR/DALL-E-2023-05-10-20-27-31-cook-looking-at-the-camera-with-a-chef-s-hat-laughing-in-an-exaggerated-w.png"), "The Funny Chief", MakeGuid(1));
+            User USER2 = new User(Constants.DEFAULT_ACCOUNT_IMAGE, "Yanis", MakeGuid(2));
+            User USER3 = new User(Constants.DEFAULT_ACCOUNT_IMAGE, "Leo", MakeGuid(3));
+
+            db.InsertUser(USER1);
+            db.InsertUser(USER2);
+            db.InsertUser(USER3);
+
+            db.InsertAccount(new Account(USER1, "chief@cook.com"), "123456");
+            db.InsertAccount(new Account(USER2, "yanis@google.com"), "123456");
+            db.InsertAccount(new Account(USER3, "leo@google.com"), "123456");
+
+            db.InsertRecipe(new Recipe(new RecipeInfo("Chicken Salad", 500, 20, new Uri("https://healthyfitnessmeals.com/wp-content/uploads/2021/04/Southwest-chicken-salad-7-500x500.jpg"), 4, Guid.NewGuid()), USER1, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
+            db.InsertRecipe(new Recipe(new RecipeInfo("Chocolate Cake", 2500, 10, new Uri("https://bakewithshivesh.com/wp-content/uploads/2022/08/IMG_0248-scaled.jpg"), 3, Guid.NewGuid()), USER2, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
+            db.InsertRecipe(new Recipe(new RecipeInfo("Salmon", 20, 10, new Uri("https://www.wholesomeyum.com/wp-content/uploads/2021/06/wholesomeyum-Pan-Seared-Salmon-Recipe-13.jpg"), 4, Guid.NewGuid()), USER1, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
+            db.InsertRecipe(new Recipe(new RecipeInfo("Fish", 50, 30, new Uri("https://www.ciaanet.org/wp-content/uploads/2022/07/Atlantic-and-Pacific-whole-salmon-1024x683.jpg"), 4.5F, Guid.NewGuid()), USER3, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
+            db.InsertRecipe(new Recipe(new RecipeInfo("Space Cake", 800, 5, new Uri("https://static.youmiam.com/images/recipe/1500x1000/space-cake-22706?placeholder=web_recipe&sig=f14a7a86da837c6b8cc678cde424d6d5902f99ec&v3"), 5, Guid.NewGuid()), USER3, new List<Ingredient> { new Ingredient("Ingredient 1", 6) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Step 1", "Bake the eggs") }.ToImmutableList()));
+            db.InsertRecipe(new Recipe(new RecipeInfo("Cupcake", 500, 12, new Uri("https://www.mycake.fr/wp-content/uploads/2015/12/rs_cupcake_4x3.jpg"), 4.2F, Guid.NewGuid()), USER1, new List<Ingredient> { new Ingredient("Chocolate", 4) }.ToImmutableList(), new List<PreparationStep> { new PreparationStep("Eat Chocolate", "Eat the chocolate") }.ToImmutableList()));
+        }
+
+        private static Guid MakeGuid(int seed)
+        {
+            var r = new Random(seed);
+            var guid = new byte[16];
+            r.NextBytes(guid);
+
+            return new Guid(guid);
+        }
     }
 }

LocalEndpoint/RecipesDatabase.cs

@@ -1,75 +0,0 @@
-using Models;
-using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Runtime.Serialization;
-
-namespace LocalEndpoint
-{
-
-    internal class RecipesDatabase
-    {
-
-        private static readonly DataContractSerializer RECIPES_SERIALIZER = new DataContractSerializer(typeof(List<Recipe>));
-        
-        private readonly Dictionary<Guid, Recipe> recipes = new Dictionary<Guid, Recipe>();
-        private readonly string dbPath;
-
-        public RecipesDatabase(string path)
-        {
-            dbPath = path;
-           
-            
-            if (!File.Exists(dbPath))
-            {
-                File.Create(dbPath);
-            }
-            if (new FileInfo(dbPath).Length == 0)
-                return; //file is empty thus there is nothing to deserialize
-            Console.WriteLine(File.ReadAllText(dbPath));
-
-            using (var stream = File.OpenRead(dbPath)) { 
-                var recipes = RECIPES_SERIALIZER.ReadObject(stream) as List<Recipe>;
-                recipes.ForEach(recipe =>  this.recipes.Add(recipe.Info.Id, recipe));
-            }
-        }
-
-        private void SaveAll()
-        {
-            using (var stream = File.OpenWrite(dbPath))
-            {
-                RECIPES_SERIALIZER.WriteObject(stream, recipes.Values.ToList());
-            }
-        }
-
-        public Recipe? Lookup(Guid id)
-        {
-            Recipe? recipe;
-            recipes.TryGetValue(id, out recipe);
-            return recipe;
-        }
-
-
-        public Recipe Get(Guid id)
-        {
-            return recipes[id];
-        }
-
-        public void Insert(Recipe recipe)
-        {
-            recipes[recipe.Info.Id] = recipe;
-            SaveAll();
-        }
-
-        public void Remove(Guid id)
-        {
-            recipes.Remove(id);
-            SaveAll();
-        }
-
-        public ImmutableList<Recipe> ListAll()
-        {
-            return recipes.Values.ToImmutableList();
-        }
-
-    }
-}

LocalEndpoint/RecipesService.cs

@@ -1,4 +1,5 @@
 using Endpoint;
+using LocalEndpoint.Data;
 using Models;
 using System.Collections.Immutable;
 
@@ -7,22 +8,22 @@ namespace LocalEndpoint
     internal class RecipesService : IRecipesService
     {
 
-        private readonly RecipesDatabase db;
-        private readonly Dictionary<Account, AccountData> accountsData = new Dictionary<Account, AccountData>();
+        private readonly Database db;
+        private readonly Dictionary<Account, AccountServices> accountsData = new Dictionary<Account, AccountServices>();
 
-        public RecipesService(RecipesDatabase db)
+        public RecipesService(Database db)
         {
             this.db = db;
         }
 
         public ImmutableList<RecipeInfo> PopularRecipes()
         {
-            return db.ListAll().Take(4).ToImmutableList().ConvertAll(v => v.Info);
+            return db.ListAllRecipes().Take(4).ToImmutableList().ConvertAll(v => v.Info);
         }
 
         public Recipe GetRecipe(RecipeInfo info)
         {
-            return db.Get(info.Id);
+            return db.GetRecipe(info.Id);
         }
 
 
@@ -35,16 +36,16 @@ namespace LocalEndpoint
             return GetOrInitData(account).Preferences;
         }
 
-        private AccountData GetOrInitData(Account account)
+        private AccountServices GetOrInitData(Account account)
         {
-            AccountData? data;
+            AccountServices? data;
             accountsData.TryGetValue(account, out data);
 
             if (data == null)
             {
                 AccountOwnedRecipes recipes = new AccountOwnedRecipes(account, db);
                 AccountRecipesPreferences preferences = new AccountRecipesPreferences(account, db);
-                data = new AccountData(recipes, preferences);
+                data = new AccountServices(recipes, preferences);
                 accountsData.Add(account, data);
             }
             return data;

Models/AccountRecipeRate.cs

@@ -1,5 +0,0 @@
-
-namespace Models
-{
-    public record AccountRecipeRate(bool IsFavorite = false, uint Rate = 0);
-}

Models/Ingredient.cs

@@ -2,18 +2,8 @@
 
 namespace Models
 {
-    [DataContract]
-    public class Ingredient
-    {
-        [DataMember]
-        public string Name { get; init; }
-        [DataMember]
-        public float Amount { get; init; }
 
-        public Ingredient(string name, float amount)
-        {
-            Name = name;
-            Amount = amount;
-        }
-    }   
+
+    [DataContract]
+    public record Ingredient([property: DataMember] string Name, [property: DataMember] float Amount);
 }

Models/PreparationStep.cs

@@ -3,17 +3,5 @@
 namespace Models
 {
     [DataContract]
-    public record PreparationStep
-    {
-        [DataMember]
-        public string Name { get; init; }
-        [DataMember]
-        public string Description { get; init; }
-
-        public PreparationStep(string name, string description)
-        {
-            Name = name;
-            Description = description;
-        }
-    }
+    public record PreparationStep([property: DataMember] string Name, [property: DataMember] string Description);
 }

Models/Recipe.cs

@@ -4,23 +4,11 @@ using System.Runtime.Serialization;
 namespace Models
 {
     [DataContract]
-    public class Recipe
-    {
-        [DataMember]
-        public RecipeInfo Info { get; init; }
-        [DataMember]
-        public User Owner { get; init; }
-        [DataMember]
-        public ImmutableList<Ingredient> Ingredients { get; init; }
-        [DataMember]
-        public ImmutableList<PreparationStep> Steps { get; init; }
+    public record Recipe(
+        [property: DataMember] RecipeInfo Info,
+        [property: DataMember] User Owner,
+        [property: DataMember] ImmutableList<Ingredient> Ingredients,
+        [property: DataMember] ImmutableList<PreparationStep> Steps
+    );
 
-        public Recipe(RecipeInfo info, User owner, ImmutableList<Ingredient> ingredients, ImmutableList<PreparationStep> steps)
-        {
-            Info = info;
-            Owner = owner;
-            Ingredients = ingredients;
-            Steps = steps;
-        }
-    }
 }

Models/RecipeInfo.cs

@@ -3,29 +3,12 @@
 namespace Models
 {
     [DataContract]
-    public class RecipeInfo
-    {
-        [DataMember]
-        public string Name { get; init; }
-        [DataMember]
-        public uint CalPerPers { get; init; }
-        [DataMember]
-        public uint CookTimeMins { get; init; }
-        [DataMember]
-        public Uri? Image { get; init; }
-        [DataMember]
-        public float AverageNote { get; init; }
-        [DataMember]
-        public Guid Id { get; init; }
-
-        public RecipeInfo(string name, uint calPerPers, uint cookTimeMins, Uri? image, float averageNote, Guid id)
-        {
-            Name = name;
-            CalPerPers = calPerPers;
-            CookTimeMins = cookTimeMins;
-            Image = image;
-            AverageNote = averageNote;
-            Id = id;
-        }
-    }
+    public record RecipeInfo(
+        [property: DataMember] string Name,
+        [property: DataMember] uint CalPerPers,
+        [property: DataMember] uint CookTimeMins,
+        [property: DataMember] Uri? Image,
+        [property: DataMember] float AverageNote,
+        [property: DataMember] Guid Id
+    );
 }

Models/RecipeRate.cs

@@ -0,0 +1,11 @@
+
+using System.Runtime.Serialization;
+
+namespace Models
+{
+    [DataContract]
+    public record RecipeRate(
+        [property: DataMember] bool IsFavorite = false,
+        [property: DataMember] uint Rate = 0
+    );
+}

Models/User.cs

@@ -9,11 +9,23 @@ namespace Models
         public Uri ProfilePicture { get; init; }
         [DataMember]
         public string Name { get; init; }
+        [DataMember]
+        public Guid Id { get; init; }
 
-        public User(Uri profilePicture, string name)
+        public User(Uri profilePicture, string name, Guid id)
         {
             ProfilePicture = profilePicture;
             Name = name;
+            Id = id;
+        }
+
+        public override bool Equals(object? other)
+        {
+            if (this == other) 
+                return true;
+
+            User? otherUser = other as User;
+            return otherUser != null && Id.Equals(otherUser.Id);
         }
     }
 }

Views/Components/RecipeView.xaml

@@ -14,6 +14,7 @@
             MinimumHeightRequest="175"
             MinimumWidthRequest="150"
             RowDefinitions="*, Auto">
+            
             <Grid.GestureRecognizers>
                 <TapGestureRecognizer Tapped="OnRecipeTapped"/>
             </Grid.GestureRecognizers>

Views/RecipePage.xaml.cs

@@ -27,7 +27,7 @@ public partial class RecipePage : ContentPage
         this.notifier = notifier;
         this.info = recipe.Info;
 
-        AccountRecipeRate rate = preferences.GetRate(recipe.Info);
+        RecipeRate rate = preferences.GetRate(recipe.Info);
 
         note = rate.Rate;
         isFavorite = rate.IsFavorite;
@@ -80,6 +80,10 @@ public partial class RecipePage : ContentPage
     private void OnFavorite(object o, EventArgs e)
     {
         SetFavorite(!isFavorite);
+        if (isFavorite)
+            preferences.AddToFavorites(info);
+        else
+            preferences.RemoveFromFavorites(info);
     }
 
     private void OnSubmitReviewClicked(object o, EventArgs e)
@@ -100,19 +104,12 @@ public partial class RecipePage : ContentPage
     {
         this.isFavorite = isFavorite;
         if (isFavorite)
-        {
             Favorite.Source = ImageSource.FromFile("hearth_on.svg");
-            preferences.AddToFavorites(info);
-        }
         else
-        {
             Favorite.Source = ImageSource.FromFile("hearth_off.svg");
-            preferences.RemoveFromFavorites(info);
-        }
     }
     private void OnBackButtonClicked(object sender, EventArgs e)
     {
-
         Navigation.PopAsync();
     }