7 files changed, 165 insertions, 0 deletions
diff --git a/Data/Models/Classes/Language.cs b/Data/Models/Classes/Language.cs
new file mode 100644
index 0000000..116b451
--- /dev/null
+++ b/Data/Models/Classes/Language.cs
@@ -0,0 +1,7 @@
+namespace Data.Models.Classes
+{
+	public class Language
+	{
+		public int Id { get; set; }
+	}
+}
diff --git a/Data/Models/Classes/Roles.cs b/Data/Models/Classes/Roles.cs
new file mode 100644
index 0000000..1f8c9f2
--- /dev/null
+++ b/Data/Models/Classes/Roles.cs
@@ -0,0 +1,9 @@
+using Microsoft.AspNetCore.Identity;
+
+namespace Data.Models.Classes
+{
+	public class Roles : IdentityRole<int>
+	{
+		
+	}
+}
+\ No newline at end of file
diff --git a/Data/Models/Classes/Technology.cs b/Data/Models/Classes/Technology.cs
new file mode 100644
index 0000000..ccdc425
--- /dev/null
+++ b/Data/Models/Classes/Technology.cs
@@ -0,0 +1,7 @@
+namespace Data.Models.Classes
+{
+	public class Technology
+	{
+		public int Id { get; set; }
+	}
+}
diff --git a/Data/Models/Classes/User.cs b/Data/Models/Classes/User.cs
new file mode 100644
index 0000000..525d725
--- /dev/null
+++ b/Data/Models/Classes/User.cs
@@ -0,0 +1,93 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.AspNetCore.Identity;
+using System.Collections.Generic;
+
+namespace Data.Models.Classes
+{
+	[Table("Users")]
+	public class User : IdentityUser<int>
+	{
+		private string _firstName;
+		private string _lastName;
+		private string _profilePicture;
+
+		[Required]
+		[Range(3, 50)]
+		[Display(Name = "Username")]
+		public override string UserName 
+		{
+			get => base.UserName;
+			set 
+			{
+				ValidateString("Username", 3, 50, value, true);
+				base.UserName = value;
+			}
+		}
+		
+		[Required]
+		[Range(3, 30)]
+		public string FirstName 
+		{
+			get => this._firstName;
+			set 
+			{
+				ValidateString("FirstName", 3, 30, value, false);
+				this._firstName = value;
+			}
+		}
+		
+		[Required]
+		[Range(3, 30)]
+		public string LastName 
+		{ 
+			get => this._lastName;
+			set 
+			{
+				ValidateString("LastName", 3, 30, value, false);
+				this._lastName = value;
+			}
+		}
+
+		public string ProfilePicture 
+		{
+			get => this._profilePicture;
+			set 
+			{
+				ValidateURL(value);
+				this._profilePicture = value;
+			}
+		}
+		
+		// public List<User> Friends { get; set; }
+
+		/// <summary>
+		/// Throws an argument exception if the given value is not composed only of letters, and if specified, also of digits.
+		/// Does nothing otherwise.
+		/// </summary>
+		private static void ValidateString(string name, int minLength, int maxLength, string value, bool canBeDigit) 
+		{
+			if (value.Length < minLength || value.Length > maxLength)
+				throw new ArgumentException($"{name} length cannot be less than {minLength} and more than {maxLength}.");
+
+			foreach (char character in value) // more efficient than Linq
+			{ 	
+				if (!Char.IsLetter(character))
+					if (!(Char.IsDigit(character) && canBeDigit))
+						throw new ArgumentException($"{name} contains invalid characters."); 
+			}
+		}
+
+		/// <summary>
+		/// Throws an exception if the absolute url isn't valid.
+		/// Does nothing otherwise.
+		/// </summary>
+		private static void ValidateURL(string urlValue) 
+		{
+			// Throws an error is URL is invalid
+			Uri validatedUri;
+			Uri.TryCreate(urlValue, UriKind.Absolute, out validatedUri);
+		}
+	}
+}
diff --git a/Data/Models/DTOs/UserDTO.cs b/Data/Models/DTOs/UserDTO.cs
new file mode 100644
index 0000000..d0b8642
--- /dev/null
+++ b/Data/Models/DTOs/UserDTO.cs
@@ -0,0 +1,11 @@
+namespace Data.Models.DTOs
+{
+	public class UserDTO
+	{
+		public int Id { get; set; }
+		public string UserName { get; set; }
+		public string Email { get; set; }
+		public string FirstName { get; set; }
+		public string LastName { get; set; }
+	}
+}
+\ No newline at end of file
diff --git a/Data/Models/Interfaces/Database/IRepository.cs b/Data/Models/Interfaces/Database/IRepository.cs
new file mode 100644
index 0000000..81a1a35
--- /dev/null
+++ b/Data/Models/Interfaces/Database/IRepository.cs
@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Data.Models.Interfaces.Database
+{
+	public interface IRepository<TEntity>
+		where TEntity : class
+	{
+		//Add Entity to database
+		Task AddAsync(TEntity entity);
+
+		//Return *count* instances of Entity from the database
+		IEnumerable<TEntity> Query(int count);
+
+		//Find entity by id
+		Task<TEntity> FindByIdAsync(object id);
+
+		//Modify Entity from database
+		Task EditAsync(object id, TEntity newEntity);
+
+		//Delete Entity from database
+		Task DeleteAsync(object id);
+	}
+}
+\ No newline at end of file
diff --git a/Data/Models/Profiles/UserProfile.cs b/Data/Models/Profiles/UserProfile.cs
new file mode 100644
index 0000000..048deed
--- /dev/null
+++ b/Data/Models/Profiles/UserProfile.cs
@@ -0,0 +1,14 @@
+using Data.Models.Classes;
+using Data.Models.DTOs;
+using AutoMapper;
+
+namespace Data.Models.Profiles 
+{
+	public class UserProfile : Profile
+	{
+		public UserProfile() 
+		{
+			CreateMap<UserDTO, User>();
+		}
+	} 
+}