Merge pull request #27 from kzi-nastava/feat/Course

[Add] CoursesDAO class to Model; functions and attributes to Course class

LangLang/Core/Model/Course.cs

@@ -4,77 +4,161 @@
 using System.Text;
 using System.Threading.Tasks;
 using System.Xml.Linq;
+using LangLang.Core.Repository.Serialization;
 
 namespace LangLang.Core.Model
 {
-    class Course
+    public class Course : ISerializable
     {
         // Attributes
-        private string language;
-        private LanguageLevel level;
-        private int numberOfWeeks;
-        private List<WeekDays> days;
-        private bool online;
-        private int numberOfStudents;
-        private int maxStudents;
+        private int _id;
+        private string _language;
+        private LanguageLevel _level;
+        private int _numberOfWeeks;
+        private List<WeekDays> _days;
+        private bool _online;
+        private int _numberOfStudents;
+        private int _maxStudents;
+        private DateTime _creationDate;
 
         // Properties
+
+        public int Id
+        {
+            get { return _id; }
+            set { _id = value; }
+        }
         public string Language
         {
-            get { return language; }
-            set { language = value; }
+            get { return _language; }
+            set { _language = value; }
         }
 
         public LanguageLevel Level
         {
-            get { return level; }
-            set { level = value; }
+            get { return _level; }
+            set { _level = value; }
         }
 
         public int NumberOfWeeks
         {
-            get { return numberOfWeeks; }
-            set { numberOfWeeks = value; }
+            get { return _numberOfWeeks; }
+            set { _numberOfWeeks = value; }
         }
         public List<WeekDays> Days
         {
-            get { return days; }
-            set { days = value; }
+            get { return _days; }
+            set { _days = value; }
         }
 
         public bool Online
         {
-            get { return online; }
-            set { online = value; }
+            get { return _online; }
+            set { _online = value; }
         }
 
         public int NumberOfStudents
         {
-            get { return numberOfStudents; }
-            set { numberOfStudents = value; }
+            get { return _numberOfStudents; }
+            set { _numberOfStudents = value; }
         }
 
         public int MaxStudents
         {
-            get { return maxStudents; }
-            set { maxStudents = value; }
+            get { return _maxStudents; }
+            set { _maxStudents = value; }
+        }
+
+        public DateTime CreationDate 
+        {
+            get { return _creationDate; }
+            set { _creationDate = value; }
         }
 
         // Constructors
 
-        public Course(string language, LanguageLevel level, int numberOfWeeks, List<WeekDays> days, bool online, int numberOfStudents, int maxStudents)
+        public Course(int id, string language, LanguageLevel level, int numberOfWeeks, List<WeekDays> days, bool online, int maxStudents)
         {
+            Id = id;
             Language = language;
             Level = level;
             NumberOfWeeks = numberOfWeeks;
             Days = days;
             Online = online;
-            NumberOfStudents = numberOfStudents;
+            NumberOfStudents = 0;
             MaxStudents = maxStudents;
+            CreationDate = DateTime.Now;
         }
 
         public Course()
         { 
         }
+
+        public override string ToString()
+        {
+            StringBuilder sbDays = new StringBuilder();
+            foreach (WeekDays day in Days)
+            {
+                sbDays.Append(day.ToString() + " ");
+            }
+
+            // Deletes the last white space from stringbuilder
+            if (sbDays.Length > 0)
+            {
+                sbDays.Remove(sbDays.Length - 1, 1);
+            }
+
+            return $"ID: {Id,5} | Language: {Language,20} | Level: {Level,5} | NumberOfWeeks: {NumberOfWeeks,5} | Days: {sbDays, 10} | Online: {Online,5} | NumberOfStudents : {NumberOfStudents,5} | MaxStudents : {MaxStudents,5} | CreationDate : {CreationDate,10} |";
+        }
+
+        public string[] ToCSV()
+        {
+            StringBuilder sbDays = new StringBuilder();
+            foreach (WeekDays day in Days)
+            {
+                sbDays.Append(day.ToString() + " ");
+            }
+
+            // Deletes the last white space from stringbuilder
+            if (sbDays.Length > 0)
+            {
+                sbDays.Remove(sbDays.Length - 1, 1);
+            }
+
+            string[] csvValues =
+            {
+                Id.ToString(),
+                Language,
+                Level.ToString(),
+                NumberOfWeeks.ToString(),
+                sbDays.ToString(),
+                Online.ToString(),
+                NumberOfStudents.ToString(),
+                MaxStudents.ToString(),
+                CreationDate.ToString()
+            };
+            return csvValues;
+        }
+
+        public void FromCSV(string[] values)
+        {
+            Id = int.Parse(values[0]);
+            Language = values[1];
+            Level = (LanguageLevel)Enum.Parse(typeof(LanguageLevel), values[2]);
+            NumberOfWeeks = int.Parse(values[3]);
+
+            // Converting from string to list of WeekDays
+            string[] days = values[4].Split(' ');
+            Days = new List<WeekDays>();
+            foreach (string day in days)
+            {
+                Days.Add((WeekDays)Enum.Parse(typeof(WeekDays), day));
+            }
+
+            Online = bool.Parse(values[5]);
+            NumberOfStudents = int.Parse(values[6]);
+            MaxStudents = int.Parse(values[7]);
+            CreationDate = DateTime.Parse(values[8]);
+        }
     }
 }

LangLang/Core/Model/DAO/CoursesDAO.cs

@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using System.Linq;
+using LangLang.Core.Repository;
+using LangLang.Core.Model;
+using LangLang.Core.Observer;
+
+namespace LangLang.Core.Model.DAO;
+
+public class CoursesDAO : Subject
+{
+    private readonly List<Course> _courses;
+    private readonly Repository<Course> _repository;
+
+    public CoursesDAO()
+    {
+        _repository = new Repository<Course>("courses.csv");
+        _courses = _repository.Load();
+    }
+
+    private int GenerateId()
+    {
+        if (_courses.Count == 0) return 0;
+        return _courses.Last().Id + 1;
+    }
+
+    public Course AddCourse(Course Course)
+    {
+        Course.Id = GenerateId();
+        _courses.Add(Course);
+        _repository.Save(_courses);
+        NotifyObservers();
+        return Course;
+    }
+
+    public Course UpdateCourse(Course Course)
+    {
+        Course oldCourse = GetCourseById(Course.Id);
+        if (oldCourse == null) return null;
+
+        oldCourse.Language = Course.Language;
+        oldCourse.Level = Course.Level;
+        oldCourse.NumberOfWeeks = Course.NumberOfWeeks;
+        oldCourse.Days = Course.Days;
+        oldCourse.Online = Course.Online;
+        oldCourse.NumberOfStudents = Course.NumberOfStudents;
+        oldCourse.MaxStudents = Course.MaxStudents;
+
+        _repository.Save(_courses);
+        NotifyObservers();
+        return oldCourse;
+    }
+
+    public Course RemoveCourse(int id)
+    {
+        Course course = GetCourseById(id);
+        if (course == null) return null;
+
+        _courses.Remove(course);
+        _repository.Save(_courses);
+        NotifyObservers();
+        return course;
+    }
+
+    private Course GetCourseById(int id)
+    {
+        return _courses.Find(v => v.Id == id);
+    }
+
+    public List<Course> GetAllCourses()
+    {
+        return _courses;
+    }
+
+}