using ConfectioneryListImplement;
using EkzamenContracts.BindingModels;
using EkzamenContracts.SearchModels;
using EkzamenContracts.StoragesContract;
using EkzamenContracts.ViewModels;

namespace EkzamenListImplement
{
    public class StudentStorage : IStudentStorage
    {
        private readonly DataListSingleton _source = DataListSingleton.GetInstance();

        public List<StudentViewModel> GetFullList()
        {
            return _source.Students.Select(x => x.GetViewModel).ToList();
        }
        public List<StudentViewModel> GetFilteredList(StudentSearchModel model)
        {
            var result = new List<StudentViewModel>();
            if (model.CreatedDateFrom is null || model.CreatedDateTo is null)
            {
                return result;
            }
            return _source.Students.Where(x => model.CreatedDateFrom <= x.DateEnrollment && x.DateEnrollment <= model.CreatedDateTo).Select(x => x.GetViewModel).ToList();
        }
        public StudentViewModel? GetElement(StudentSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            return _source.Students.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }
        public StudentViewModel? Insert(StudentBindingModel model)
        {
            model.Id = _source.Students.Max(x => x.Id);
            var newComponent = Student.Create(model);
            if (newComponent == null)
            {
                return null;
            }
            _source.Students.Add(newComponent);
            return newComponent.GetViewModel;
        }
        public StudentViewModel? Update(StudentBindingModel model)
        {
            var student = _source.Students.FirstOrDefault(x => x.Id == model.Id);
            if (student != null)
            {
                student.Update(model);
            }
            return student?.GetViewModel;
        }
        public StudentViewModel? Delete(StudentBindingModel model)
        {
            var student = _source.Students.FirstOrDefault(x => x.Id == model.Id);
            if (student != null)
            {
                _source.Students.Remove(student);
            }
            return student?.GetViewModel;
        }
    }
}