using Microsoft.EntityFrameworkCore;
using StudentEnrollmentContracts.BindingModels;
using StudentEnrollmentContracts.SearchModels;
using StudentEnrollmentContracts.StorageContracts;
using StudentEnrollmentContracts.ViewModels;
using StudentEnrollmentDatabaseImplement.Models;

namespace StudentEnrollmentDatabaseImplement.Implements
{
	public class FacultyStorage : IFacultyStorage
	{
        public List<FacultyViewModel> GetFullList()
        {
            using var context = new StudentEnrollmentDatabase();
            return context.faculty
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<FacultyViewModel> GetFilteredList(FacultySearchModel model)
        {
            if (string.IsNullOrEmpty(model.name))
            {
                return new();
            }
            using var context = new StudentEnrollmentDatabase();
            return context.faculty
                .Where(x => (model.faculty_id.HasValue && x.faculty_id == model.faculty_id) || (string.IsNullOrEmpty(model.name) && x.name == model.name))
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public FacultyViewModel? GetElement(FacultySearchModel model)
        {
            if (string.IsNullOrEmpty(model.name) && !model.faculty_id.HasValue)
            {
                return null;
            }
            using var context = new StudentEnrollmentDatabase();
            return context.faculty
                .FirstOrDefault(x => (model.faculty_id.HasValue && x.faculty_id == model.faculty_id) || (string.IsNullOrEmpty(model.name) && x.name == model.name))?
                .GetViewModel;
        }
        public FacultyViewModel? Insert(FacultyBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var newFaculty = Faculty.Create(model);
            if (newFaculty == null)
            {
                return null;
            }
            context.faculty.Add(newFaculty);
            context.SaveChanges();
            return newFaculty.GetViewModel;
        }
        public FacultyViewModel? Update(FacultyBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var faculty = context.faculty.FirstOrDefault(x => x.faculty_id == model.Id);
            if (faculty == null)
            {
                return null;
            }
            faculty.Update(model);
            context.SaveChanges();
            return faculty.GetViewModel;
        }
        public FacultyViewModel? Delete(FacultyBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var element = context.faculty.FirstOrDefault(rec => rec.faculty_id == model.Id);
            if (element != null)
            {
                context.faculty.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}