using MongoDB.Bson;
using MongoDB.Driver;
using SportCompetitionsContracts.BindingModels;
using SportCompetitionsContracts.SearchModels;
using SportCompetitionsContracts.StoragesContracts;
using SportCompetitionsContracts.ViewModels;
using SportCompetitionsMongo.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SportCompetitionsMongo.Implements
{
    public class CompetitionStorage : ICompetitionStorage
    {

        public void ClearEntity()
        {
            using var context = new SportCompetitionsMongoDB();
            context.GetCollection<Competition>("Competitions")
                .DeleteMany(Builders<Competition>.Filter.Empty);
        }

        public List<CompetitionViewModel> GetFullList()
        {
            using var context = new SportCompetitionsMongoDB();
            var competitions = context.GetCollection<Competition>("Competitions");
            return competitions.Find(Builders<Competition>.Filter.Empty)
                .ToList()
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<CompetitionViewModel> GetFilteredList(CompetitionSearchModel model)
        {
            if (string.IsNullOrEmpty(model.CompetitionName)) return new List<CompetitionViewModel>();
            using var context = new SportCompetitionsMongoDB();
            var competitions = context.GetCollection<Competition>("Competitions");

            var filterBuilder = Builders<Competition>.Filter;
            var filter = filterBuilder.Regex(x => x.CompetitionName, new BsonRegularExpression(model.CompetitionName));
            return competitions
                .Find(filter)
                .ToList()
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public CompetitionViewModel? GetElement(CompetitionSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using (var context = new SportCompetitionsMongoDB())
            {
                var competitions = context.GetCollection<Competition>("Competitions");

                var filterBuilder = Builders<Competition>.Filter;
                var filter = filterBuilder.Empty;

                if (!model.Id.HasValue)
                {
                    filter &= filterBuilder.Eq(x => x.Id, model.Id);
                }

                return competitions.Find(filter)
                    .FirstOrDefault()
                    ?.GetViewModel;
            }
        }
        public CompetitionViewModel? Insert(CompetitionBindingModel model)
        {
            using var context = new SportCompetitionsMongoDB();

            var competitions = context.GetCollection<Competition>("Competitions");

            model.Id = (int)competitions.CountDocuments(FilterDefinition<Competition>.Empty);

            var competition = Competition.Create(model);
            competitions.InsertOne(competition);
            return competition.GetViewModel;
        }
        public CompetitionViewModel? Update(CompetitionBindingModel model)
        {
            using var context = new SportCompetitionsMongoDB();
            var competitions = context.GetCollection<Competition>("Competitions");

            var filter = Builders<Competition>.Filter.Eq(x => x.Id, model.Id);
            var competition = competitions.Find(filter).FirstOrDefault();
            if (competition == null)
            {
                return null;
            }
            competition.Update(model);
            competitions.ReplaceOne(filter, competition);
            return competition.GetViewModel;
        }
        public CompetitionViewModel? Delete(CompetitionBindingModel model)
        {
            using var context = new SportCompetitionsMongoDB();
            var categories = context.GetCollection<Competition>("Competitions");

            var filter = Builders<Competition>.Filter.Eq(x => x.Id, model.Id);
            var category = categories.FindOneAndDelete(filter);
            return category?.GetViewModel;
        }
    }
}