using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VeterinaryClinicContracts.BindingModels;
using VeterinaryClinicContracts.ViewModels;
using VeterinaryClinicDataModels.Models;

namespace VeterinaryClinicDatabaseImplement.Models
{
    public class Medicine : IMedicineModel
    {
        public int Id { get; set; }
        [Required]
        public string MedicineName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IMedicationModel, int)>? _MedicineMedications = null;
        [NotMapped]
        public Dictionary<int, (IMedicationModel, int)> MedicineMedications
        {
            get
            {
                if (_MedicineMedications == null)
                {
                    _MedicineMedications = Medications.ToDictionary(recPC => recPC.MedicationId, recPC =>
                   (recPC.Medication as IMedicationModel, recPC.Count));
                }
                return _MedicineMedications;
            }
        }
        [ForeignKey("MedicineId")]
        public virtual List<MedicineMedication> Medications { get; set; } = new();
        [ForeignKey("MedicineId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Medicine Create(VeterinaryClinicDatabase context, MedicineBindingModel model)
        {
            return new Medicine()
            {
                Id = model.Id,
                MedicineName = model.MedicineName,
                Price = model.Price,
                Medications = model.MedicineMedications.Select(x => new MedicineMedication
                {
                    Medication = context.Medications.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(MedicineBindingModel model)
        {
            MedicineName = model.MedicineName;
            Price = model.Price;
        }
        public MedicineViewModel GetViewModel => new()
        {
            Id = Id,
            MedicineName = MedicineName,
            Price = Price,
            MedicineMedications = MedicineMedications
        };
        public void UpdateMedications(VeterinaryClinicDatabase context, MedicineBindingModel model)
        {
            var MedicineMedications = context.MedicineMedications.Where(rec =>
           rec.MedicineId == model.Id).ToList();
            if (MedicineMedications != null && MedicineMedications.Count > 0)
            {
                context.MedicineMedications.RemoveRange(MedicineMedications.Where(rec
               => !model.MedicineMedications.ContainsKey(rec.MedicationId)));
                context.SaveChanges();
                foreach (var updateMedication in MedicineMedications)
                {
                    updateMedication.Count =
                   model.MedicineMedications[updateMedication.MedicationId].Item2;
                    model.MedicineMedications.Remove(updateMedication.MedicationId);
                }
                context.SaveChanges();
            }
            var Medicine = context.Medicines.First(x => x.Id == Id);
            foreach (var pc in model.MedicineMedications)
            {
                context.MedicineMedications.Add(new MedicineMedication
                {
                    Medicine = Medicine,
                    Medication = context.Medications.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _MedicineMedications = null;
        }
    }
}