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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Core;
using Tango.Core.DI;
using Tango.Integration.ExternalBridge;
using Tango.PPC.Common.ExternalBridge;
using Tango.PPC.Shared.Statistics;

namespace Tango.PPC.Common.Statistics
{
    [TangoCreateWhenRegistered]
    public class DefaultStatisticsService : ExtendedObject, IStatisticsService, IExternalBridgeRequestHandler
    {
        public bool Enabled { get; set; } = true;

        public DefaultStatisticsService(IPPCExternalBridgeService externalBridge)
        {
            try
            {
                externalBridge.RegisterRequestHandler(this);
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error initializing the statistics service.");
                Enabled = false;
            }
        }

        [ExternalBridgeRequestHandlerMethod(typeof(GetStatisticsRequiredFiltersRequest), RequestHandlerLoggingMode.LogRequestName)]
        public async Task OnGetStatisticsRequiredFiltersRequest(GetStatisticsRequiredFiltersRequest request, String token, ExternalBridgeReceiver receiver)
        {
            this.ThrowIfDisabled();

            var response = new GetStatisticsRequiredFiltersResponse();

            using (ObservablesContext db = ObservablesContext.CreateDefault())
            {
                var jobNames = await db.JobRuns.Select(x => x.JobName).ToListAsync();
                var threadNames = await db.Rmls.Select(x => x.DisplayName).ToListAsync();
                response.FiltersData.Jobs = jobNames;
                response.FiltersData.Rmls = threadNames;
            }

            await receiver.SendGenericResponse(response, token);
        }

        [ExternalBridgeRequestHandlerMethod(typeof(GetStatisticsRequest), RequestHandlerLoggingMode.LogRequestName)]
        public async Task OnGetStatisticsRequest(GetStatisticsRequest request, String token, ExternalBridgeReceiver receiver)
        {
            this.ThrowIfDisabled();

            var response = new GetStatisticsResponse();

            using (ObservablesContext db = ObservablesContext.CreateDefault())
            {
                var filters = request.Filters;

                var db_JobRuns = db.JobRuns.Where(x => (x.StartDate <= filters.EndDateUTC && x.StartDate >= filters.StartDateUTC));

                int[] jobRunStatusArr = filters.EndStatuses.Distinct().ToArray();
                if (jobRunStatusArr.Length > 0)
                {
                    db_JobRuns = db_JobRuns.Where(x => jobRunStatusArr.Contains(x.Status));
                }

                if (!filters.IncludeHeadCleaning)
                {
                    db_JobRuns = db_JobRuns.Where(x => !x.IsHeadCleaning);
                }

                List<String> rmlGuids = filters.Threads;

                if (filters.Threads.Count > 0)
                {
                    db_JobRuns = db_JobRuns.Where(x => rmlGuids.Contains(x.RmlGuid));
                }

                if (filters.JobName.IsNotNullOrEmpty())
                {
                    db_JobRuns = db_JobRuns.Where(x => x.JobName.ToLower().StartsWith(filters.JobName.ToLower()));
                }

                db_JobRuns = db_JobRuns.Where(x => x.JobLength < filters.MinLength && x.JobLength >= filters.MaxLength);

                var runs_db = await db_JobRuns.ToListAsync();

                runs_db.ForEach(x => x.LiquidQuantityString = null);
            }

            await receiver.SendGenericResponse(response, token);
        }

        public void OnReceiverDisconnected(ExternalBridgeReceiver receiver)
        {

        }
    }
}