add exceptions and RecipeManager's progress to GetRecipesByPriorityOrder

MCTG/Exception/AppException.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

MCTG/Exception/RecipeNotFoundException.cs

@@ -0,0 +1,10 @@
+
+namespace AppException
+{
+    [Serializable]
+    public class RecipeNotFoundException : Exception
+    {
+        public RecipeNotFoundException() : base("Recipe not found.") { }
+        public RecipeNotFoundException(int id) : base($"Recipe id: '{id}'not found.") { }
+    }
+}

MCTG/Exception/UserNotFoundException.cs

@@ -0,0 +1,9 @@
+namespace AppException
+{
+    [Serializable]
+    public class UserNotFoundException : Exception
+    {
+        public UserNotFoundException() : base("User not found.") { }
+        public UserNotFoundException(string userMail) : base($"User with mail: '{userMail}' not found.") { }
+    }
+}

MCTG/Managers/Managers.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

MCTG/Managers/RecipeDefaultManager.cs

@@ -0,0 +1,80 @@
+using AppException;
+using Model;
+
+namespace Managers
+{
+    public class RecipeDefaultManager : IRecipeManager
+    {
+        private IDataManager _dataManager;
+
+        public RecipeDefaultManager(IDataManager dataManager)
+        {
+            _dataManager = dataManager;
+        }
+
+        public bool AddRecipeToData(Recipe recipe)
+        {
+            var recipeList = _dataManager.Data[nameof(Recipe)];
+
+            if (recipeList.Exists(r => r.Equals(recipe)))
+                return false;
+
+            _dataManager.Data[nameof(Recipe)].Add(recipe);
+            return true;
+        }
+
+        public RecipeCollection GetAllRecipes()
+        {
+            return new RecipeCollection(
+                "All recipes",
+                _dataManager.GetFromData<Recipe>().ToArray());
+        }
+
+        public RecipeCollection GetRecipeByAuthor(string authorMail)
+        {
+            User? author = _dataManager.GetFromData<User>()
+                                       .ToList()
+                                       .Find(u => u.Mail == authorMail);
+            if (author is null)
+                throw new UserNotFoundException(authorMail);
+
+            return new RecipeCollection(
+                $"{author.Name} {author.Surname}'s recipes",
+                _dataManager.GetFromData<Recipe>().ToArray());
+        }
+
+        public RecipeCollection GetRecipeByTitle(string title)
+        {
+            IEnumerable<Recipe> recipes = from Recipe recipe in _dataManager.GetFromData<Recipe>()
+                                          where recipe.Title.Contains(title)
+                                          select recipe;
+            return new RecipeCollection(
+                $"Search for '{title}'", recipes.ToArray());
+        }
+
+        public Recipe GetRecipeFromId(int id)
+        {
+            Recipe? recipe = _dataManager.GetFromData<Recipe>()
+                                        .ToList()
+                                        .Find(r => r.Id == id);
+            if (recipe is null)
+                throw new RecipeNotFoundException();
+
+            return recipe;
+        }
+
+        public RecipeCollection GetRecipesByPriorityOrder(Priority priority)
+        {
+            IEnumerable<Recipe> recipes = from Recipe recipe in _dataManager.GetFromData<Recipe>()
+                                          where recipe.Title.Contains(title)
+                                          select recipe;
+            return new RecipeCollection(
+                $"Suggestions", recipes.ToArray());
+        }
+
+        public bool ModifyRecipeInData(Recipe recipe)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

MCTG/Model/Managers/IDataManager.cs

@@ -1,17 +1,23 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Model.Managers
+namespace Model
 {
     public interface IDataManager
     {
+        IDataSerializer Serializer { get; }
+        Dictionary<string, List<object>> Data { get; }
+
         void LoadData();
         void ReloadData();
         void SaveData();
         void Import<T>(string pathOfTheFile) where T : class;
         void Export<T>(T obj, string pathToExport) where T : class;
+
+        ICollection<T> GetFromData<T>();
     }
 }

MCTG/Model/Managers/IRecipeManager.cs

@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Model.Managers
+namespace Model
 {
     public interface IRecipeManager
     {

MCTG/Model/Managers/IUserManager.cs

@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Model.Managers
+namespace Model
 {
     public interface IUserManager
     {