using Hcs.WebApp.Data.Hcs;
using Hcs.WebApp.Services;

namespace Hcs.WebApp.BackgroundServices.CampaignManagers
{
    public class ExportCommonRegistryElementsManager_15_7_0_1(OperationExecutionState operationExecutionState, ResultWaitState resultWaitState, Campaign campaign) : ManagerBase(operationExecutionState, resultWaitState, campaign)
    {
        private enum Step
        {
            Start = 0,
            Execution = 1,
            Wait = 2,
            End = 3
        }

        public override async Task StartAsync(IServiceScope scope)
        {
            if (campaign.StartedAt.HasValue)
            {
                State = IManager.ManagerState.Started;

                return;
            }

            var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();
            var registryService = scope.ServiceProvider.GetRequiredService<RegistryService>();
            using var context = headquartersService.GetNewContext();
            using var transaction = await context.Database.BeginTransactionAsync();
            IEnumerable<Operation> operations = null;
            try
            {
                await headquartersService.SetCampaignStartedAsync(context, campaign.Id);

                campaign.Step = (int)Step.Execution;
                await headquartersService.UpdateCampaignStepAsync(context, campaign);

                var registryCount = await registryService.GetRegistryCountAsync(context, true);
                operations = await headquartersService.InitiateOperationsAsync(context, registryCount, campaign.Id, Operation.OperationType.NsiCommon_ExportNsiItem_15_7_0_1);
                await registryService.SetOperationsToRegistriesAsync(context, true, operations);

                await transaction.CommitAsync();
            }
            catch
            {
                transaction?.Rollback();

                throw;
            }

            if (operations != null)
            {
                foreach (var operation in operations)
                {
                    operationExecutionState.EnqueueOperation(operation);
                }
            }

            State = IManager.ManagerState.Started;
        }

        public override async Task CheckStateAsync(IServiceScope scope)
        {
            if (State == IManager.ManagerState.Started)
            {
                switch ((Step)campaign.Step)
                {
                    case Step.Execution:
                        if (!operationExecutionState.HasCampaignOperation(campaign.Id))
                        {
                            campaign.Step = (int)Step.Wait;
                            var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();
                            await headquartersService.UpdateCampaignStepAsync(campaign);

                            var operations = await headquartersService.GetOperationsAsync(campaign.Id);
                            foreach (var operation in operations)
                            {
                                if (!string.IsNullOrEmpty(operation.MessageGuid))
                                {
                                    resultWaitState.EnqueueOperation(operation);
                                }
                            }
                        }
                        break;

                    case Step.Wait:
                        if (!resultWaitState.HasCampaignOperation(campaign.Id))
                        {
                            var headquartersService = scope.ServiceProvider.GetRequiredService<HeadquartersService>();
                            using var context = headquartersService.GetNewContext();
                            using var transaction = await context.Database.BeginTransactionAsync();
                            try
                            {
                                campaign.Step = (int)Step.End;
                                await headquartersService.UpdateCampaignStepAsync(context, campaign);

                                await headquartersService.SetCampaignEndedAsync(campaign.Id);

                                await transaction.CommitAsync();
                            }
                            catch
                            {
                                transaction?.Rollback();

                                throw;
                            }

                            State = IManager.ManagerState.Ended;
                        }
                        break;
                }
            }
        }
    }
}