using HospitalContracts.BindingModels;
using HospitalContracts.SearchModels;
using HospitalContracts.StoragesContracts;
using HospitalContracts.ViewModels;
using HospitalDataBaseImplements.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HospitalDataBaseImplements.Implements
{
    public class IllnessStorage : IIllnessStorage
    {
        public List<IllnessViewModel> GetFullList()
        {
            using var context = new HospitalDatabase();
            return context.Illnesses
             .Include(x => x.Kurses)
            .ThenInclude(x => x.Kurse)
            .Include(x => x.Symptomses)
            .ThenInclude(x => x.Symptoms)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<IllnessViewModel> GetFilteredList(IllnessSearchModel model)
        {
            if (string.IsNullOrEmpty(model.IllnessName))
            {
                return new();
            }
            using var context = new HospitalDatabase();
            return context.Illnesses
             .Include(x => x.Kurses)
            .ThenInclude(x => x.Kurse)
            .Include(x => x.Symptomses)
            .ThenInclude(x => x.Symptoms)
            .Where(x => x.IllnessName.Contains(model.IllnessName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public IllnessViewModel? GetElement(IllnessSearchModel model)
        {
            if (string.IsNullOrEmpty(model.IllnessName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new HospitalDatabase();
            return context.Illnesses
             .Include(x => x.Kurses)
             .ThenInclude(x => x.Kurse)
             .Include(x => x.Symptomses)
             .ThenInclude(x => x.Symptoms)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.IllnessName) &&
            x.IllnessName == model.IllnessName) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }
        public IllnessViewModel? Insert(IllnessBindingModel model)
        {
            using var context = new HospitalDatabase();
            var newIllness = Illness.Create(context, model);
            if (newIllness == null)
            {
                return null;
            }
            context.Illnesses.Add(newIllness);
            context.SaveChanges();
            return newIllness.GetViewModel;
        }
        public IllnessViewModel? Update(IllnessBindingModel model)
        {
            using var context = new HospitalDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var illness = context.Illnesses.FirstOrDefault(rec =>
                rec.Id == model.Id);
                if (illness == null)
                {
                    return null;
                }
                illness.Update(model);
                context.SaveChanges();
                illness.UpdateDrugCourses(context, model);
                illness.UpdateSymptomses(context, model);
                transaction.Commit();
                return illness.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
        public IllnessViewModel? Delete(IllnessBindingModel model)
        {
            using var context = new HospitalDatabase();
            var element = context.Illnesses
            .Include(x => x.Kurses)
            .Include(x => x.Symptomses)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Illnesses.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}