using SchoolAgainStudyContracts.BindingModel;
using SchoolAgainStudyContracts.ViewModel;
using SchoolAgainStudyDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace SchoolAgainStudyDataBaseImplements.Models
{
    public class Diy : IDiy
    {
        [Required]
        public string Title { get; set; } = string.Empty;
        [Required]
        public string Description { get; set; } = string.Empty;
        [Required]
        public DateTime DateCreate { get; set; }
        [Required]
        public int TaskId { get; set; }
        public string TaskName { get; set; } = string.Empty;
        public virtual Task Task { get; set; }
        [Required]
        public int StudentId { get; set; }
        public string StudentName { get; set; } = string.Empty;
        public virtual Student Student { get; set; }
        private Dictionary<int, IInterest>? _DiyInterests = null;
        [NotMapped]
        public Dictionary<int, IInterest> DiyInterests {
            get
            {
                if (_DiyInterests == null)
                {
                    _DiyInterests = Interests
                            .ToDictionary(recPC => recPC.InterestId, recPC => (recPC.Interest as IInterest));
                }
                return _DiyInterests;
            }
        }

        public int Id { get; set; }
        [ForeignKey("DiyId")]
        public virtual List<DiyInterest> Interests { get; set; } = new();
        public static Diy Create(SchoolDataBase context, DiyBindingModel model)
        {
            return new Diy()
            {
               Id = model.Id,
               Title = model.Title,
               Description = model.Description,
               DateCreate = model.DateCreate,
               TaskId = model.TaskId,
               TaskName = model.TaskName,
               StudentId = model.StudentId,
               StudentName = model.StudentName,
               Interests = model.DiyInterests.Select(x => new DiyInterest
                {
                    Interest = context.Interests.First(y => y.Id == x.Key),
                }).ToList()
            };
        }

        public void Update(DiyBindingModel model)
        {
            Title = model.Title;
            Description = model.Description;
            DateCreate = model.DateCreate;
        }

        public DiyViewModel GetViewModel => new()
        {
            Id = Id,
            Title=Title,
            Description=Description,
            DateCreate = DateCreate,
            TaskId = TaskId,
            TaskName = TaskName,
            StudentId = StudentId,
            StudentName = StudentName,
            DiyInterests=DiyInterests
        };

        public void UpdateInterests(SchoolDataBase context, DiyBindingModel model)
        {
            var diyInterests = context.DiyInterests.Where(rec => rec.DiyId == model.Id).ToList();
            if (diyInterests != null && diyInterests.Count > 0)
            {
                context.DiyInterests.RemoveRange(diyInterests.Where(rec => !model.DiyInterests.ContainsKey(rec.InterestId)));
                context.SaveChanges();

                foreach (var updateInterest in diyInterests)
                {
                    model.DiyInterests.Remove(updateInterest.InterestId);
                }
                context.SaveChanges();
            }
            var diy = context.Diys.First(x => x.Id == Id);
            foreach (var pc in model.DiyInterests)
            {
                context.DiyInterests.Add(new DiyInterest
                {
                    Diy = diy,
                    Interest = context.Interests.First(x => x.Id == pc.Key),
                });
                context.SaveChanges();
            }
            _DiyInterests = null;
        }
    }
}