using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Reflection;

namespace ExercisesDAL
{
    public class StudentModel
    {
        IRepository<Students> repository;

        public StudentModel()
        {
            repository = new SomeSchoolRepository<Students>();
        }

        public Students GetByLastName(string name)
        {
            List<Students> selectedStudent = null;

            try
            {
                selectedStudent = repository.GetByExpression(stu => stu.LastName == name);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return selectedStudent.FirstOrDefault();
        }

        public Students GetById(int id)
        {
            List<Students> selectedStudent = null;

            try
            {
                selectedStudent = repository.GetByExpression(stu => stu.Id == id);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return selectedStudent.FirstOrDefault();
        }

        public List<Students> GetAll()
        {
            List<Students> allStudents = new List<Students>();

            try
            {
                allStudents = repository.GetAll();
            }
            catch (Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return allStudents;
        }

        public int Add(Students newStudent)
        {
            try
            {
                repository.Add(newStudent);
            }
            catch(Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return newStudent.Id;
        }

        public UpdateStatus Update(Students updatedStudent)
        {
            UpdateStatus operationStatus = UpdateStatus.Failed;

            try
            {
                operationStatus = repository.Update(updatedStudent);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return operationStatus;
        }

        public int Delete(int Id)
        {
            int studentsDeleted = -1;

            try
            {
                studentsDeleted = repository.Delete(Id);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Problem in " + GetType().Name + " " +
                    MethodBase.GetCurrentMethod().Name + " " + ex.Message);
                throw ex;
            }

            return studentsDeleted;
        }
    }
}