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

namespace AsbCloudInfrastructure.Services
{
    public class EventService : IEventService
    {
        private readonly IAsbCloudDbContext db;
        private readonly ITelemetryService telemetryService;
        private readonly CacheTable<Event> cacheEvents;

        public EventService(IAsbCloudDbContext db, CacheDb cacheDb, ITelemetryService telemetryService)
        {
            this.db = db;
            this.telemetryService = telemetryService;
            cacheEvents = cacheDb.GetCachedTable<Event>((AsbCloudDbContext)db);
        }

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

            var telemetryId = telemetryService.GetOrCreateTemetryIdByUid(uid);

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

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

            foreach (var dto in dtos)
            {
                var entity = new Event
                {
                    IdEvent = dto.Id,
                    IdTelemetry = telemetryId,
                    IdCategory = dto.IdCategory,
                    MessageTemplate = dto.Message
                };

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

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