using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudApp.Comparators;
using AsbCloudDb.Model;
using AsbCloudInfrastructure.Services.Cache;
using System.Collections.Generic;
using System.Linq;

namespace AsbCloudInfrastructure.Services
{
    public class TelemetryUserService : ITelemetryUserService
    {
        private readonly IAsbCloudDbContext db;
        private readonly ITelemetryService telemetryService;
        private readonly CacheTable<TelemetryUser> cacheTUsers;

        public TelemetryUserService(IAsbCloudDbContext db, CacheDb cacheDb, ITelemetryService telemetryService)
        {
            this.db = db;
            this.telemetryService = telemetryService;
            cacheTUsers = cacheDb.GetCachedTable<TelemetryUser>((AsbCloudDbContext)db);
        }

        public void Upsert(string uid, IEnumerable<TelemetryUserDto> dtos)
        {
            if (!dtos.Any())
                return;

            dtos = dtos.Distinct(new TelemetryUserDtoComparer());

            var telemetryId = telemetryService.GetOrCreateTemetryIdByUid(uid);

            var ids = dtos.Select(e => e.Id).ToList();

            var dbIds = (from e in db.TelemetryUsers
                         where e.IdTelemetry == telemetryId && ids.Contains(e.IdUser)
                         select e.IdUser).ToList();

            foreach (var dto in dtos)
            {
                var entity = new TelemetryUser
                {
                    IdUser = dto.Id,
                    IdTelemetry = telemetryId,
                    Level = dto.Level,
                    Name = dto.Name,
                    Patronymic = dto.Patronymic,
                    Surname = dto.Surname,
                };

                if (dbIds.Contains(dto.Id))
                    db.TelemetryUsers.Update(entity);
                else
                    db.TelemetryUsers.Add(entity);
            }

            db.SaveChanges();
            cacheTUsers.Refresh();
        }
    }
}