using PolyclinicContracts.BindingModels;
using PolyclinicContracts.ViewModels;
using PolyclinicDataModels.Models;
using SecuritySystemDatabaseImplement;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace PolyclinicDatabaseImplement.Models
{
    public class Symptom : ISymptomModel
    {
        [Required]
        public string Name { get; set; } = string.Empty;
        [Required]
        public string Comment { get; set; } = string.Empty;
        [ForeignKey("SymptomId")]
        public virtual List<SymptomDiagnose> Diagnoses { get; set; } = new();
        private Dictionary<int, IDiagnoseModel>? _symptomDiagnoses = null;
        [NotMapped]
        public Dictionary<int, IDiagnoseModel> SymptomDiagnoses
        {
            get
            {
                if (_symptomDiagnoses == null)
                {
                    _symptomDiagnoses = Diagnoses.ToDictionary(
                        symptomDiagnose => symptomDiagnose.DiagnoseId,
                        symptomDiagnose => symptomDiagnose.Diagnose as IDiagnoseModel
                    );
                }
                return _symptomDiagnoses;
            }
        }
        public int Id { get; set; }

        public static Symptom Create(PolyclinicDatabase context, SymptomBindingModel model)
        {
            return new Symptom()
            {
                Id = model.Id,
                Name = model.Name,
                Comment = model.Comment,
                Diagnoses = model.SymptomDiagnoses.Select(symptomDiagnose => new SymptomDiagnose
                {
                    Diagnose = context.Diagnoses.First(diagnose => diagnose.Id == symptomDiagnose.Key)
                }).ToList()
            };
        }

        public void Update(SymptomBindingModel model)
        {
            Comment = model.Comment;
            Name = model.Name;
        }

        public SymptomViewModel GetViewModel => new()
        {
            Id = Id,
            Comment = Comment,
            Name = Name,
            SymptomDiagnoses = SymptomDiagnoses
        };

        public void UpdateDiagnoses(PolyclinicDatabase context, SymptomBindingModel model)
        {
            var symptomDiagnoses = context.SymptomDiagnoses.Where(rec => rec.SymptomId == model.Id).ToList();
            if (symptomDiagnoses != null && symptomDiagnoses.Count > 0)
            {
                // удалили те, которых нет в модели
                context.SymptomDiagnoses.RemoveRange(symptomDiagnoses
                    .Where(rec => !model.SymptomDiagnoses.ContainsKey(rec.DiagnoseId)));
                context.SaveChanges();
            }
            var course = context.Symptomes.First(x => x.Id == Id);
            foreach (var pc in model.SymptomDiagnoses)
            {
                context.SymptomDiagnoses.Add(new SymptomDiagnose
                {
                    Symptom = course,
                    Diagnose = context.Diagnoses.First(x => x.Id == pc.Key),
                });
                context.SaveChanges();
            }
            _symptomDiagnoses = null;
        }
    }
}