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

namespace EkzamenDatabaseImplement
{
    public class StudentStorage : IStudentStorage
    {
        public List<StudentViewModel> GetFullList()
        {
            using var context = new ConfectioneryDatabase();
            return context.Students
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<StudentViewModel> GetFilteredList(StudentSearchModel model)
        {
            if (model.CreatedDateFrom is null || model.CreatedDateTo is null)
            {
                return new();
            }
            using var context = new ConfectioneryDatabase();
            return context.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;
            }
            using var context = new ConfectioneryDatabase();
            return context.Students
            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
            ?.GetViewModel;
        }
        public StudentViewModel? Insert(StudentBindingModel model)
        {
            var newComponent = Student.Create(model);
            if (newComponent == null)
            {
                return null;
            }
            using var context = new ConfectioneryDatabase();
            context.Students.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }
        public StudentViewModel? Update(StudentBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var component = context.Students.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }
        public StudentViewModel? Delete(StudentBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var element = context.Students.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Students.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}