using HospitalContracts.BindingModels;
using HospitalContracts.ViewModels;
using HospitalDataModels.Models;
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;

namespace HospitalDataBaseImplements.Models
{
    public class Procedures: IProceduresModel
    {
        public int Id { get; private set; }
        [Required]
        public int ClientId { get; private set; }
        [Required]
        public string ProceduresName { get; private set; } = string.Empty;
        [Required]
        public string Type { get; private set; } = string.Empty;
        public virtual Client Client { get; set; }
        private Dictionary<int, IMedicinesModel>? _procedureMedicine = null;

        [NotMapped]
        public Dictionary<int, IMedicinesModel> ProcedureMedicine
        {
            get
            {
                if (_procedureMedicine == null)
                {
                    _procedureMedicine = Medicines
                    .ToDictionary(rec => rec.MedicineId, rec =>
                   rec.Medicine as IMedicinesModel);
                }
                return _procedureMedicine;
            }
        }
        [ForeignKey("ProcedureId")]
        public virtual List<ProcedureMedicine> Medicines { get; set; } = new();
        public static Procedures? Create(ProceduresBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Procedures()
            {
                Id = model.Id,
                ClientId = model.ClientId,
                ProceduresName = model.ProceduresName,
                Type = model.Type
            };
        }
        public static Procedures Create(HospitalDatabase context, ProceduresViewModel model)
        {
            return new Procedures
            {
                Id = model.Id,
                ClientId = model.ClientId,
                ProceduresName = model.ProceduresName,
                Type = model.Type,
                Medicines = model.ProcedureMedicine.Select(x => new ProcedureMedicine
                {
                    Medicine = context.Medicines.First(y => y.Id == x.Key),
                }).ToList()
            };
        }
        public void Update(ProceduresBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            ProceduresName = model.ProceduresName;
            Type = model.Type;
        }
        public ProceduresViewModel GetViewModel => new()
        {
            Id = Id,
            ClientId = ClientId,
            ProceduresName = ProceduresName,
            Type = Type,
            ProcedureMedicine = ProcedureMedicine
        };

        public void UpdateMedicines(HospitalDatabase context, ProceduresBindingModel model)
        {
            var procedureMedicine = context.ProcedureMedicine.Where(rec => rec.ProcedureId == model.Id).ToList();
            if (procedureMedicine != null && procedureMedicine.Count > 0)
            {
                context.ProcedureMedicine.RemoveRange(procedureMedicine.Where(rec
               => !model.ProcedureMedicine.ContainsKey(rec.MedicineId)));
                context.SaveChanges();
            }
            var procedure = context.Procedures.First(x => x.Id == Id);
            var existingMedicineIds = procedureMedicine?.Select(x => x.MedicineId).ToList();
            foreach (var rec in model.ProcedureMedicine)
            {
                    context.ProcedureMedicine.Add(new ProcedureMedicine
                    {
                        Procedure = procedure,
                        Medicine = context.Medicines.First(x => x.Id == rec.Key),
                    });
            }
            context.SaveChanges();
            _procedureMedicine = null;
        }
    }
}